• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present disclosure relates to a method of manufacturing a core using an inorganic binder, a core thus made, a method of manufacturing a casting product with a core using an inorganic binder, a casting product so manufactured, and a system of making a core using an inorganic binder.
    公开号:FR3031687A1
    申请号:FR1561662
    申请日:2015-12-01
    公开日:2016-07-22
    发明作者:Jeong Wook Park；Woo Chun Kim；Ki Myoung Kwon；Man Sig Lee；Myung Hwan Kim；Min A Bae
    申请人:DR AXION CO Ltd；
    IPC主号:
    专利说明:

    [0001] The present disclosure relates to a method of manufacturing a core using an inorganic binder, a core thus made, a method of manufacturing a casting product with a core using an inorganic binder. , a casting product so manufactured, and a core manufacturing system using an inorganic binder.
    [0002] The Korean casting foundry industry has contributed greatly to all kinds of industries, including the shipbuilding industry, the auto parts industry, the industrial machinery industry, the construction machinery industry, and similar. Although the casting foundry industry is an important core industry indispensable for the development of the domestic industry, the current environment surrounding the casting foundry industry, such as environmental problems, price fluctuations of secondary materials, policies, lack of manpower, and the like, is not very good. First and foremost, environmental issues have been prioritized for resolution. Currently, in the casting industry, environmental pollution has been improved to block the escape of environmental pollutants generated during a metal dissolution process, a core manufacturing process and a casting process. Nevertheless, because the casting industry has been regulated in terms of greenhouse gas emissions by the Muskie Act, the Kyoto Protocol, and the like, a process to get rid of the base pollutant release and a technical process for reducing energy consumption, improving the working environment and greening manufacturing sites are urgently needed. Generally, a core used in the casting industry is produced by mixing sand and an organic binder and hardening the mixture with a core machine and a mold. Figure 1 is a flowchart illustrating a process for manufacturing a core and a casting product using an organic binder according to the prior art. However, as illustrated in FIG. 1, if a core is made using an organic binder, environmental pollution is caused by the organic binder 30 and energy consumption is increased when a curing process using heating proceeds, resulting in a decrease in the life of a mold. In addition, if a casting process is performed with the core made with the organic binder, a core gas is generated during the casting process, resulting in a deterioration of the quality of a casting product, a decreased mold life and environmental pollution. As a result, there is a need to develop a new binder as a substitute for a conventional organic binder in response to demands for improving the quality of a casting product, guaranteeing price competitiveness and strengthening environmental regulations. . Currently, a study to develop an inorganic binder that is an ecological substance of high quality and low price is conducted. However, if a core is made using an inorganic binder, a curing process can be performed at a low temperature and a toxic substance is not generated, and thus a working environment is maintained in good condition. In addition, only a small amount of a gas is generated during a core manufacturing process and a casting process, and thus casting defects are reduced, and there is no need to install a environmental pollution control system, and thus, manufacturing costs can be reduced. However, the inorganic binder can cause kernel quality deterioration due to its hygroscopic property and sand calcination phenomenon. Accordingly, the inventors of the present disclosure have attempted to satisfy the above-mentioned technical requirements, and have finally completed the present disclosure by improving a process and developing a method of manufacturing a core and casting product improved in terms of of hygroscopic property and calcination phenomenon of sand using an inorganic binder which is improved in terms of properties such as water resistance, strength and flowability. Accordingly, it is an object of the present disclosure to provide a method of making a core using an inorganic binder.
    [0003] In addition, another object of the present disclosure is to provide a core made by the manufacturing method described above.
    [0004] Also, yet another object of the present disclosure is to provide a method of manufacturing a core casting product using an inorganic binder. In addition, yet another object of the present disclosure is to provide a casting product made by the method of manufacturing a casting product with the core using an inorganic binder. In addition, yet another object of the present disclosure is to provide a core manufacturing system using an inorganic binder. According to a first aspect to achieve an object of the present disclosure, there is provided a method of manufacturing a core using an inorganic binder, including: a step of providing original sand in which original molding sand is supplied to a grinding wheel; a grinding step in which the original molding sand is mixed and ground with a liquid inorganic binder including water glass and ground sand is prepared by the grinding wheel; a sand transfer step in which the crushed sand is transferred from the grinding wheel to a ground sand hopper; a sand supplying step in which the crushed sand is supplied from the ground sand hopper to a blowing head positioned under the crushed sand hopper; A blowing step in which the ground sand provided in the blowing head is blown into a core mold; a gas evacuation step in which the interior of the core mold is evacuated and depressurized; a curing step in which after the core mold is preheated, the interior of the blown core is cured and calcined; and an extraction step in which the core mold is separated and the hardened core is extracted, characterized in that the inorganic binder includes the water-soluble glass at 40 to 70 parts by weight, of the nanosilica at 5 to 35 parts by weight, a Li-based water-resistant additive in an amount of 0.1 to 10 parts by weight, an organic silicon compound in an amount of 0.1 to 10 parts by weight, and an additive anti calcination of the sand at a level of 1 to 10 parts by weight.
    [0005] Preferably, the inorganic binder is mixed in an amount of 1 to 6% by weight based on the original molding sand. In addition, preferably, the Li-based water-resistant additive includes one or more elements selected from lithium carbonate, lithium silicate, lithium hydroxide, lithium sulfate, lithium bromide. In addition, preferably, the organic silicon compound includes one or more elements selected from methyltriethoxysilane, sodium methylsiliconate, methyltrimethoxysilane, potassium methylsiliconate, butyltrimethoxysilane and vinyltrimethoxysilane. In addition, preferably, the anti-calcination additive of sand includes one or more elements selected from monosaccharides, polysaccharides and disaccharides. In addition, preferably, the original sand supplying step includes: a step of supplying the original sand measured at a predetermined amount of a top seed sand storage hopper of origin to a lower hopper sand measuring; and a step of supplying the original sand from the bottom sand measuring hopper to the grinding wheel. In addition, preferably, the grinding step includes: a grinding step of the original molding sand supplied from the bottom sand grit hopper for 10 to 60 seconds; and a step of preparing crushed sand fed to an inorganic binder from a grinding binder supply device and grinding the inorganic binder for 30 to 120 seconds. Further, preferably, in the sand supplying step, the crushed sand is supplied from the crushed sand hopper to the blowing head positioned under the crushed sand hopper, and the crushed sand supplied is dispensed to a crushed sand hopper. upper end of a blowing nozzle plate by a ground sand flux guide positioned at a lower end within the blowing head. In addition, preferably, the curing step includes: a step of preheating the core mold to 100 to 200 ° C; and a step of hardening and calcining the interior of the blown core.
    [0006] According to a second aspect to achieve another object of the present disclosure, there is provided a core manufactured using an inorganic binder according to the method of manufacturing a core. Preferably, when the core is exposed to an environmental condition with an absolute humidity of 20 to 30 g / m 3 for 3 hours, the core has a flexural strength of 60% or more over an initial flexural strength. More preferably, the initial flexural strength of the core is 150 N / cm 2 or more. In addition, according to a third aspect, to achieve yet another object of the present disclosure, there is provided a method of manufacturing a casting product with a core using an inorganic binder, comprising: a step of storing a core using an inorganic binder manufactured by the method of making a core; A pouring step of making a product by pouring molten metal of a predetermined material into a mold formed into a predetermined shape using the stored core; a mechanical sand removal step of removing the core used in the pouring step; and a heating step including a water quenching process of the product from which the sand has been removed, characterized in that in the water quenching process of the heating step, chemical sand removal is performed by adding a chemically hydrolyzed solution to hydrolyze the inorganic binder remaining in the core after the mechanical sand removal step. Preferably, the chemically hydrolyzed solution is a silicate solution including sodium silicate or sodium metasilicate, or a phosphate solution including sodium phosphate or disodium phosphate. In addition, according to a fourth aspect to achieve yet another object of the present disclosure, there is provided a casting product made by the method of manufacturing a casting product with the core using an inorganic binder.
    [0007] In addition, according to a fifth aspect to achieve yet another object of the present disclosure, there is provided a core manufacturing system using an inorganic binder, including: an upper hopper configured to store original molding sand; a bottom sand hopper connected to a lower portion of the upper hopper and configured to be provided with original molding sand from the upper hopper, for measuring the original molding sand to a predetermined amount, and to provide the original molding sand to a grinding wheel; an inorganic binder supply device configured to supply an inorganic binder stored in a predetermined amount to the grinding wheel; a grinding wheel connected to the lower sand and grinding hopper and configured to mix and grind the original molding sand supplied from the bottom sand measuring hopper with the inorganic binder supplied from the supply device inorganic binder; A ground sand hopper configured to feed crushed sand from the grinding wheel and supply the ground sand to a blowing head; the blowing head positioned under the crushed sand hopper and configured to feed crushed sand from the crushed sand hopper and blow the crushed sand into a core mold; and the core mold configured to cure and calcine ground sand blown from the blowing head, wherein the inorganic binder includes water-soluble glass of from 40 to 70 parts by weight, of the nanosilica 35 parts by weight, a Li-based water-resistant additive of 0.1 to 10 parts by weight, an organic silicon compound of 0.1 to 10 parts by weight, and a friendly additive calcination of the sand at a level of 1 to 10 parts by weight. Preferably, the blowing head includes a sand flux guide ground at a lower end within the blowing head, and further includes a blow nozzle plate including a blow nozzle at a lower end of the blower guide. flow of crushed sand. According to the method of manufacturing a core using an inorganic binder of the present disclosure, it is easy to perform a casting operation. In addition, it is easy to remove the sand from a casting product made by the casting operation and also, sand calcination phenomenon does not occur. In addition, the casting product made by the inorganic binder core manufacturing method of the present disclosure has excellent surface quality and formability and also exhibits improved mechanical strength and filling capacity. In addition, according to the present disclosure, a curing process can be performed at a low temperature and a toxic substance is not generated, and thus, a working environment is maintained in a good condition. In addition, only a small amount of a gas is generated during a core manufacturing process and a casting process, and thus casting defects are reduced, and there is no need to install a environmental pollution control system, and thus, manufacturing costs can be reduced. Fig. 1 is a flowchart illustrating a process for manufacturing a core and a casting product using an organic binder according to the prior art; Fig. 2 is a diagram illustrating a process for manufacturing a core and a casting product using an inorganic binder according to the present disclosure; Fig. 3 is a diagram illustrating a configuration of a core manufacturing system using an inorganic binder according to an exemplary embodiment of the present disclosure; Figure 4 illustrates a result of evaluating the mechanical strength and formability of a core using an inorganic binder and manufactured according to an embodiment of the present disclosure; Figure 5 illustrates flexural strength over time after a core using an inorganic binder and manufactured according to an embodiment of the present disclosure is cured and bending resistance over time after the moisture is absorbed by force; Figure 6 illustrates a shape and surface quality of a core using an inorganic binder and manufactured according to an embodiment of the present disclosure; Fig. 7 shows a flowability evaluation result of a core using an inorganic binder and manufactured according to an embodiment of the present disclosure; Fig. 8 is a diagram illustrating an external appearance of a final product produced using a core using an inorganic binder and manufactured according to an embodiment of the present disclosure; and Fig. 9 illustrates a sand removal and sand calcination evaluation result of a core using an inorganic binder and manufactured according to an embodiment of the present disclosure. Hereinafter, preferred embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. In the drawings, the thicknesses of the lines or sizes of elements may be exaggerated for clarity and convenience of explanation. Fig. 2 is a diagram illustrating a process for manufacturing a core and a casting product using an inorganic binder according to the present disclosure. Referring to Figure 2, in the present disclosure, an inorganic binder and original molding sand are mixed and a mold is used, so that a core is made using the inorganic binder, and the The core produced undergoes mechanical sand removal and chemical sand removal while a casting product is being manufactured, so that the core can be completely removed and the casting product can be manufactured. Specifically, a method of making a core using an inorganic binder according to the present disclosure includes: a step of providing original sand in which original molding sand is supplied to a grinding wheel; a grinding step in which the original molding sand is mixed and ground with a liquid inorganic binder including water glass and ground sand is prepared by the grinding wheel; a sand transfer step in which the crushed sand is transferred from the grinding wheel to a ground sand hopper; a sand supplying step in which the crushed sand is supplied from the ground sand hopper to a blowing head positioned under the crushed sand hopper; a blowing step in which the ground sand provided in the blowing head is blown into a core mold; a gas evacuation step in which the interior of the core mold 30 is evacuated and depressurized; a hardening step in which after the core mold is preheated, the interior of the blown core is hardened and calcined; and an extraction step in which the core mold is separated and the hardened core is extracted, wherein the inorganic binder includes the water-soluble glass at 40 to 70 parts by weight, of the nanosilica at 5 to 35 parts by weight, a Li-based water-resistant additive of from 0.1 to 10 parts by weight, an organic silicon compound of from 0.1 to 10 parts by weight, and an anti-calcination additive of sand from 1 to 10 parts by weight. Fig. 3 is a diagram illustrating a configuration of a core manufacturing system using an inorganic binder according to an embodiment of the present disclosure. Referring to Figure 3, the step of the manufacturing process will be described in detail. First, the original sand supplying step is a step of providing original molding sand to a grinding wheel. As illustrated in FIG. 3, a top original mold sand storage hopper is provided at a higher end of the system, and the original sand is measured at a predetermined amount and provided from the top hopper to the top. a lower sand measuring hopper and then supplying the bottom sand hopper to the grinding wheel. Here, a filter configured to filter a foreign substance that can be milled in the original sand can be provided at an uppermost surface of the upper hopper. Preferably, a filter having a mesh size of AFS 20 or more can be provided. In addition, the upper hopper includes a top level sensor for eliminating overflow of the original molding sand and a lower level sensor for detecting the lack of original molding sand at a lower portion thereof. this. In addition, the lower sand measurement hopper includes a sand measurement button for supplying the original sand in a predetermined amount to the grinding wheel, and is programmed to select a desired amount of the original sand. As a result, if the sand measurement button is pushed and operated, 20 to 70 kg of the original sand is supplied via a measuring pipe within the lower sand measuring hopper in the space approximately 20 to 60 seconds depending on the amount of original sand provided. A door for supplying the original sand to the grinding wheel after the original sand is provided is provided at the bottom. A lower door start / stop button is provided, so that the original sand is supplied to the grinding wheel by regulating the opening / closing of the lower door.
    [0008] Then, the grinding step is a step of preparing ground sand by grinding the original molding sand with a liquid inorganic binder including water-soluble glass. To be precise, the grinding wheel includes a grinding wheel and an inorganic binder supply device configured to provide an inorganic binder to the grinding wheel. The grinding wheel includes an inorganic binder supply start / stop button, a grinding container configured to house and grind original sand, and an inorganic binder therein, an agitator configured to grind the inorganic binder equally with the original sand, a motor configured to rotate the agitator, an on / off button configured to control motor drive or stop, and a volume gauge configured to adjust a rotational speed of the motor. millstone. In addition, a constant flow motor for constant delivery is provided in the inorganic binder supply device, and a pipe circulation system can be installed to prevent the inorganic binder within the take pipe, and so , to solidify. In addition, the inorganic binder delivery device includes a rotational speed control dial and is programmed to adjust a milling time and a speed depending on the quantities and properties of the original sand and the inorganic binder. Also, a door configured to provide the original sand and the inorganic binder is provided on the grinding wheel, and an openable and closed lid is provided for cleaning and checking the interior of the grinding wheel. A ground sand transfer gate configured to provide the milled sand prepared at the ground sand hopper is provided at a side surface of the grinding wheel, and includes a sand transfer start / stop button. Here, a transfer path is formed under the sand transfer gate so that the milled sand is not exposed or discharged outwardly when the prepared milled sand is fed to the milled sand hopper. In the following description, this will be referred to as "sand transfer chute". A vibrator (oscillator) is provided under the sand transfer chute so that the crushed sand is provided without stagnation while the sand is being dispensed. The vibrator is operated only while the sand transfer start button is pushed, and programmed to set a vibration time when an operation is performed continuously (automatically).
    [0009] In the grinding step using the grinding wheel, firstly, the grinding wheel is rotated at 60 to 150 rpm, and during grinding, a bottom sand hopper door is opened and then the grit sand is opened. The origin is supplied to the grinding wheel at the same time that the agitator is rotated. Preferably, primary grinding is performed to evenly spread the original sand for 10 to 60 seconds. Then, after the primary milling, while the agitator is continuously rotated, the inorganic binder supply button is pushed to provide the liquid inorganic binder in an amount of 1 to 6% by weight of the sand. from the inorganic binder supply device, so that secondary grinding is performed to evenly grind the liquid inorganic binder with the original sand for 30 to 120 seconds depending on the amount of the binder. Here, the inorganic binder includes water-soluble glass of 40 to 70 parts by weight, nanosilica of 5 to 35 parts by weight, Li-based water-resistant additive of from 0.1 to 100 parts by weight. 10 parts by weight, an organic silicon compound of 0.1 to 10 parts by weight, and an anti-calcination additive of sand of 1 to 10 parts by weight. The inorganic binder includes the nanosilica, the Li-based water-resistant additive, the organic silicon compound and the anti-calcination additive of the sand in the waterglass, and thus, the mechanical strength and resistance to water. The core water is increased to suit a climate of high temperature and high humidity and there are improvements in fluidity, sand removal, and sand calcination. To be precise, the nanosilica is a particle of silicon dioxide (SiO2) having a structure of 5 to 20 nanometers in size, and micropores are formed to be parallel to a particle surface or the pores have irregular directions. Thus, it is difficult for a foreign substance to enter the pores. In addition, when the nanosilica is synthesized with the water glass, the mechanical strength can be improved by increasing the amount of Si, and the water resistance and water repellency of a binder composition can be improved due to a structure of the nanosilica particle. Here, if the nanosilica is included in an amount of greater than 35 parts by weight, the fluidity of the inorganic binder is decreased and the excess of silica particles inhibits a curing process. Therefore, preferably, the nanosilica can be included in an amount of 5 to 35 parts by weight.
    [0010] In one embodiment, the Li-based water-resistant additive includes one or more elements selected from lithium carbonate, lithium silicate, lithium hydroxide, lithium sulfate, lithium bromide, and the like. and lithium acetate. The Li-based water-resistant additive is stable at room temperature and has a low viscosity even when the SiO 2 has a concentration as high as the water glass and a molar ratio is close to 8. In addition, The Li-resistant additive has a mixed alkaline action with Na ions in the waterglass, and thus, the chemical durability of the finished inorganic binder can be increased and the water resistance can be improved. Here, if the Li-based water-resistant additive is included in an amount of more than 10 parts by weight, a network structure of the inorganic binder is broken, resulting in a decrease in the chemical durability and resistance to water. Accordingly, preferably, the Li-based water-resistant additive can be included in an amount of 0.1 to 10 parts by weight in the inorganic binder of the present disclosure. In one embodiment, the organic silicon compound includes an organic functional group chemically bonded to an organic material and a hydrolysis group that can react with an inorganic material in the same molecule, so that the organic silicon compound can combine the organic material with the inorganic material. Thus, the mechanical strength and water resistance of the inorganic binder of the present disclosure can be increased and their quality can be improved, so that the organic silicon compound has a hydrophobic property. Preferably, the organic silicon compound may include one or more elements selected from tetraethoxysilane, methyltriethoxysilane, sodium methylsiliconate, methyltrimethoxysilane, potassium methylsiliconate, butyltrimethoxysilane and vinyltrimethoxysilane. More preferably, the organic silicon compound may be included in an amount of 0.1 to 10 parts by weight in the inorganic binder. This is because if the organic silicon compound is included in an amount of more than 10 parts by weight, the price of the inorganic binder can be increased and the property of the finished inorganic binder composition can deteriorate. In one embodiment, the anti-calcination additive of sand includes one or more elements selected from monosaccharides, polysaccharides and disaccharides. Preferably, the monosaccharides may include one or more elements selected from dextrose, fructose, mannose, galactose, glucose and ribose; the polysaccharides may include one or more elements selected from starch, glycogen, cellulose, chitin and pectin; and the disaccharides may include one or more elements selected from maltose, sugar, lactose, maltose, and lactose. In addition, since the inorganic binder includes the nanosilica, the Li-based water-resistant additive, the organic silicon compound and saccharides as additives in the waterglass, the inorganic binder increases a binding force. in the binder composition, resulting in an improvement in binder strength and water resistance and in the water repellency of the binder composition together with an increase in binding force with water. Thus, the inorganic binder can be completely dissolved in an aqueous solution, so that a binding force with the sand is improved when the inorganic binder is mixed with the original molding sand, it is possible to manufacture a core which is excellent in terms of mechanical resistance and water resistance and in which one can prevent sand calcination. In addition, after secondary grinding, the secondary grinding process of adding a suitable additive to a kernel property can be done repeatedly. In this case, a supply device for supplying the additive may additionally be provided. Here, an inorganic additive or curing agent can be provided as an additive so as to further improve the strength, flexibility and hardness of the core. In this case, preferably, the curing agent may include one or more elements selected from sodium hydroxide, sodium carbonate, potassium hydroxide, potassium carbonate, sodium phosphate, sodium phosphate, and the like. disodium, trisodium phosphate, and sodium sulfate. In addition, the amount of curing agent added is excessive, a hydrophilic property of the inorganic binder is increased, resulting in a decrease in the water resistance of the inorganic binder. Thus, more preferably, the curing agent may be included in an amount of 0.1 to 5.0 parts by weight based on the total weight of the inorganic binder composition.
    [0011] Then, the sand transfer step is a step of transferring the ground sand prepared in the grinding step to the ground sand hopper. This step can take about 30 to 60 seconds depending on the amount of ground sand. Here, the crushed sand hopper may include a ground sand storage box configured to store a predetermined amount of crushed sand, a level sensor configured to detect the lack of crushed sand within the crushed sand hopper and provide instructing to again provide ground sand, a crushed sand hopper door positioned on the crushed sand hopper and configured to be opened and closed when ground sand is provided, a vibrator positioned at a side surface of the crushed sand hopper crushed sand hopper configured to facilitate ground sand supply and to eliminate stagnation of crushed sand as crushed sand is supplied from crushed sand hopper to blowing head, and sand gate positioned under crushed sand hopper and configured to provide again the ground sand supplied to the blowing head. To be precise, before the crushed sand is transferred from the grinding wheel, a button to open the crushed sand hopper door is pushed to open the crushed sand hopper door, and when a sand transfer button of the crushed sand hopper is opened, The grinding wheel is pushed, a sand transfer gate in the grinding wheel is opened and the vibrator in the grinding wheel and the vibrator in the ground sand hopper vibrate at the same time, so that the crushed sand is supplied through the transfer chute. sand. After the crushed sand is supplied to the crushed sand hopper, the sand transfer gate is closed and the crushed sand hopper door is closed. After the supply is complete, the vibrators stop the vibrations. Next, the sand supplying step is a step of providing the ground sand supplied to the ground sand hopper in the sand transfer step to the blowing head. In this case, the blowing head is a system configured to blow the crushed sand into a mold using a suitable pressure. When the crushed sand is supplied to the blowing head, the sand gate positioned under the ground sand hopper and a crushed sand gate positioned at an upper end of the blowing head are opened and the vibrator into the sand hopper crushed vibrates, so that the crushed sand is supplied to the blowing head. After an appropriate amount of ground sand is supplied, the blow head is closed by a limit sensor on the blow head. In addition, the blowing head includes a sand flux guide ground at a lower end within the blowing head, and further includes a blast nozzle plate including a blow nozzle at a lower end of the blower nozzle. flow of crushed sand. Accordingly, in the sand supplying step, the crushed sand is supplied from the ground sand hopper to the blowing head positioned under the crushed sand hopper and the crushed sand supplied is dispensed to an upper end of the crushed sand hopper. 10 blowing nozzle by the ground sand flux guide positioned at the lower end within the blowing head. This step can take about 2 to 10 seconds depending on the amount of crushed sand. Next, the blowing step is a step of blowing the ground sand supplied into the blowing head into the core mold having a desired shape. Here, the blowing head may have a structure in which coolant is circulated to maintain a predetermined temperature. In this case, the major components may include a coolant nozzle for injecting the heat transfer fluid, a ground sand gate configured to be opened and closed when the crushed sand is provided, a sensor configured to detect excess, or the lack of crushed sand when the crushed sand is provided, a blast nozzle positioned at a specific space and configured to blow crushed sand into a mold at a predetermined pressure, a nozzle rubber configured to suppress damage to one end of the nozzle 25 during blowing, and a regulator arranged to regulate a blowing pressure according to the property of the crushed sand during blowing, and the blowing head is programmed to adjust a blowing time to adjust a blowing pressure. suction rate. In addition, in the blowing step, the blowing head is positioned under the ground sand hopper to provide the crushed sand. After a supply of the crushed sand is completed, the blow head is moved to the core mold. The blow head moved over the core mold is lowered and a nozzle is inserted from a suitable height into a blowhole on the mold and blows the ground sand into the mold at a predetermined pressure. Next, the gas evacuation step is a step of reducing an internal pressure after the ground sand is blown into the mold at a predetermined pressure. Here, a silencer for removing the noise caused by high pressure while the gas is exhausted can be provided, and is programmed to adjust a gas evacuation time. Next, the curing step is a step of curing and calcining the interior of the blown core after the core mold is preheated. To be precise, the step includes a step of preheating the core mold at 100 to 200 ° C and a step of curing and calcining the interior of the blown core. Accordingly, a heating system may be provided in the mold to preheat the mold to a suitable temperature, and a temperature sensor may be provided in each mold to maintain a predetermined temperature. The heating system is programmed to select a calcination time. Next, the extraction step is a step of extracting a finished product produced in the form of a core by curing the blown ground sand upon completion of the curing step. To be precise, the mold which may include an upper mold and a lower mold or a left mold and a straight mold is separated, and an extraction peg formed at a lower portion of the mold can move the core to an easy position to extract then the product nucleus can be extracted by a machine or by a hand. The extracted core is made using an inorganic binder and thus improved in water resistance and strength. Accordingly, the core of the present disclosure made using an inorganic binder according to the method described above can satisfy the water resistance and mechanical strength even at high temperature and high humidity in summer. As a result, when the core is exposed to an environmental condition with an absolute humidity of 20 to 30 g / m 3 for 3 hours, the core has a flexural strength of 60% or more over initial flexural strength. . According to an exemplary embodiment of the present disclosure, after exposure to a temperature of 30 to 40 ° C and a relative humidity of 60 to 70% (absolute humidity of 20 to 30 g / m 3) for 3 hours, the resistance mechanical strength is 60% or more compared to initial strength. In particular, the core of the present disclosure has an initial mechanical strength of 150 N / cm 2 or more, and even after exposure to the environmental condition with an absolute humidity of 20 to 30 g / m 3 for 3 hours, the core maintains a bending strength at 150 N / cm2 or more. As such, according to one embodiment, a core is made using an environmentally friendly inorganic binder and a casting product is made using the core. Specifically, the method of manufacturing a core bead casting product of the present disclosure includes: a step of storing a core using an inorganic binder made by the core manufacturing process ; a pouring step of making a product by pouring molten metal of a predetermined material into a mold formed into a predetermined shape using the stored core; a mechanical sand removal step of removing the core used in the casting step; and a heating step including a water quenching process of the product from which the sand has been removed, wherein in the water quenching process of the heating step, chemical sand removal is performed by adding a chemically hydrolyzed solution for hydrolyzing the inorganic binder remaining in the core after the mechanical sand removal step. To be precise, the storage step is a step of maintaining a core fabricated by the method described above and completely extracted at a predetermined temperature / humidity and storing the core in a sealed space. Preferably, the temperature is 10 to 30 ° C and the humidity is 10 to 50%. Next, the casting step is a step of manufacturing a product by pouring molten metal (referring to a molten raw material in the liquid state) of a predetermined material into a mold formed into a predetermined shape into a mold. using the stored kernel. Then, the step of removing mechanical sand is a step of removing the core used to sink the product by applying a predetermined pressure or vibration to the core within the product and rotating the core. Next, the heating step is a step of heating the product from which the sand has been removed to supplement the mechanical and physical properties of the product from which the sand has been removed. In particular, the heating step includes a quenching process with water. In the water-quenching process, chemical sand removal is effected by adding a chemically hydrolyzed solution of the inorganic binder to the water so as to chemically hydrolyze and completely decompose the remaining inorganic binder in the core after step d elimination of mechanical sand, which accelerates sand removal. Namely, in the water quenching process, mechanical sand removal is performed by loading the cured sand remaining in the casting product after the mechanical sand removal step in a water tank with the addition of water. a chemically hydrolyzed solution. Here, the chemically hydrolyzed solution may be a silicate solution including sodium silicate or sodium metasilicate, or a phosphate solution including sodium phosphate or disodium phosphate, and may have a concentration of preferably from 1 to 30 % in mole.
    [0012] As such, the casting product made with a core using an inorganic binder has excellent surface quality and formability and also displays improved mechanical strength and filling capacity. In addition, according to one embodiment, a core can be made using an environmentally friendly inorganic binder. The core manufacturing system using an inorganic binder, including: an upper hopper configured to store original molding sand; a bottom sand hopper connected to a lower portion of the upper hopper and configured to feed original mold sand from the upper hopper, measure the original molding sand to a predetermined amount, and provide the sand original molding to a grinding wheel; An inorganic binder supply device configured to supply an inorganic binder stored at a predetermined amount to a grinding wheel; a grinding wheel connected to the bottom sand and grinding hopper and configured to mix and grind the original molding sand supplied from the sand bottom hopper with an inorganic binder supplied from the supply device inorganic binder; a ground sand hopper configured to feed crushed sand from the grinding wheel and supply the ground sand to a blowing head; the blowing head being positioned under the crushed sand hopper and configured to feed crushed sand from the crushed sand hopper and blow the crushed sand into a core mold; and the core mold configured to cure and calcine ground sand blown from the blowing head. Here, the blowing head may include a ground sand flow guide at a lower end in the blowing head, and may further include a blast nozzle plate including a blast nozzle at a lower end of the blast guide. crushed sand. Hereinafter, the present disclosure will be described in detail with reference to the examples, but a scope of the present disclosure is not limited thereto. <Example 1> Preparation of inorganic binder An inorganic binder was prepared by each adding a water-resistant Li-based additive, nanosilica and an organic silicon compound in water glass and synthesizing them. A hygroscopic property of the inorganic binder was evaluated using a residual level of binder. Table 1 below lists the inorganic binder compositions and a hygroscopic property evaluation result. Referring to Table 1, it can be seen that in samples 1 to 4, as the amount of the Li-based water-resistant additive increases, the residual level of binder and viscosity increase. As a result, it can be seen that the amount of the Li-based water-resistant additive increases, the water resistance and the viscosity increase. In addition, it can be seen that in samples 5 to 8, as the amount of nanosilica increases, the amount of silicon constituting the inorganic binder increases and thus, the residual binder level and viscosity increase. This means that as the amount of the nanosilica increases, the water resistance is improved and the viscosity is increased. Moreover, it can be seen that in samples 9 to 12, when a change in the residual binder rate according to a change in the amount of the organic silicon compound is small, the organic silicon compound contributes little to an improvement in resistance to the water of the inorganic binder, but as the amount of the organic silicon compound increases, the viscosity decreases. [Table 1] Sample 1 Sample 2 Sample 3 Sample 4 Soluble glass 95 90 85 80 Additive 5 10 15 20 Water-resistant Li-based Residual rate of binder (%) 8.23 91.16 98.83 98, 47 Viscosity (cps) 32 42 456 1460 Sample 5 Sample 6 Sample 7 Sample glass 90 80 70 60 Nanosilica 10 20 30 40 Residual content of binder (%) 3.63 8.23 98.27 99.64 Viscosity (cps) Sample Sample Sample Glass Soluble Glass 95 90 85 80 Organic Silica Compound Residual Binder (%) 8.23 4.56 10.7 10.76 Viscosity (cps) <Example 2> Core Fabrication Using an Inorganic Binder Inorganic binder samples 1-12 prepared in Example 1 were prepared by adding all of a Li-based water-resistant additive. of nanosilica and an organic silicon compound as listed in the following Table 2, and a disaccharide, a sodium osaccharide and a polysaccharide of 1 to 10% as an anti-calcination additive of sand, so that the inorganic binders, including the totality of the water-resistant additive based on Li, the nanosilica, organic silicon compound and sand anti-calcination additive were prepared. The nuclei were made using the inorganic binders prepared. The compositions of the inorganic binders prepared were as listed in Table 2.15 [Table 2] Core Name 1 Core 2 Core 3 Core 4 core Composition Sample 1+ Sample 5+ Sample 9+ Anti-calcination additive Sample 1+ Sample 6+ Sample 9+ Anti-calcination additive Sample 2+ Sample 6+ Sample 10+ Anti-calcination additive Sand Sample 1+ Sand Sand Sample 6+ Sample 10+ Anti-calcination additive sand Here, a process of making a_noyau was like follows. First, Vietnam AFS 55 sand and a 1 to 6% liquid inorganic binder were mixed with dried AFS 55 sand in a blender and milled for 100 to 160 seconds, so that the crushed sand was prepared. Then, the crushed sand was injected into a mold heated to 130 to 150 ° C at a pressure of 1 to 10 bar and then cured, so that a core was made. Then, the manufactured core was extracted and cooled to room temperature. The core manufacturing process, the core manufacturing system and the manufacturing condition according to Example 2 were as illustrated in Figure 2, Figure 3 and listed in the following Table 3. [Table 3] Classification Condition of molding Sand AFS 36 to 75 Binder quantity 1 to 6% by weight Grinding time 100 to 160 s Blow pressure 1 to 10 bar Mold temperature 100 to 200 ° C Calcination time 60 to 100 100 s Blow time 1 to 5 s Gas evacuation time 1 to 5 s Heat transfer medium temperature Ambient temperature ± 5 ° C <Example 3> Casting product production In Example 3, the extracted core was stored and cooled in Example 2 in a dehumidification chamber (temperature: 10 to 30 ° C, humidity: 10 to 50%), then molten aluminum metal was poured into a mold having a predetermined shape using the core , so as to sink a product. Then, mechanical sand removal was performed to remove the core within the product. Then, a heating process was performed to complete the mechanical and physical properties of the cast product, and during a water quenching process in the heating process, a sodium silicate solution was added to the water to remove sand by chemical hydrolysis. Then, the remaining binder in the core was completely decomposed to remove a binding force. As a result, it was confirmed that the binder was completely removed as illustrated in FIG. 9. <Example 4> Core property evaluation # 1 A bending strength of a core was evaluated as a function of the composition of the inorganic binder prepared in Example 2. As a comparative example, cores made using Company A-1 inorganic binder and Company A-2 inorganic binder conventionally used were also evaluated. To be precise, after producing an inorganic binder core specimen, the inorganic binder core was at rest at room temperature for 1 hour without providing thermohygrostat. Then, an evaluation of the flexural strength was conducted. Its results are illustrated in Figure 4.
    [0013] Referring to Figure 4, the inorganic binder made by adding the additives according to the present disclosure has a higher flexural strength than the conventionally used inorganic binder (binder of Company A-1). This is believed to be due to the fact that the inorganic binder used in the present disclosure improves the mechanical strength of the core by mutual complement in each additive composition. In addition, Fig. 5 shows the overall result of a bending strength evaluation conducted at each instant of 1 min, 2 min and 50 min after an inorganic binder core specimen was produced using the binder. inorganic used to make the core 4 and cooled to room temperature without providing thermohygrostat, and a measure of flexural strength after exposure at each instant of 1 hour of moisture absorption and 3 hours of moisture absorption at a temperature of 38 ° C and a humidity of 65% in the thermohygrostat and an absolute humidity of about 30 g / m3. Referring to FIG. 5, the initial strength of the inorganic binder core was somewhat similar at the 1 minute instant, but an increase in mechanical strength at the 2 minute instant was high compared to other binders inorganic. The maximum mechanical strength was equivalent to that of the inorganic binder conventionally used (binder of Company A-2). However, according to the result of the moisture absorption strength evaluation, it was confirmed that the conventionally used inorganic binder had a remarkably reduced moisture absorption intensity, while the inorganic binder of the present disclosure had the higher intensity of moisture absorption and maintained the initial intensity even after 3 hours. In addition, it can be seen that a moisture absorption intensity decrement displays a gentle slope, and thus, it can be seen that the inorganic binder of the present disclosure has the highest resistance to moisture absorption. . Accordingly, it is judged that the inorganic binder of the present disclosure may be the easiest to use considering the weather conditions in Korea including summer (rainy season). <Example 5> Core Property Evaluation 2 A property evaluation was conducted on the cores manufactured in Example 2 in terms of core casting and casting. Their results are as illustrated in Figures 6 to 9 and listed in the following Table 4. Figure 6 shows an evaluation result of the formability. Referring to Figure 6, it can be seen that the formability is good and that there is no large difference in surface quality compared to the case of use of the inorganic binder conventionally used.
    [0014] Figure 7 shows a result of evaluation of the fluidity. Referring to FIG. 7, it can be seen that when crushed sand is transferred from the ground sand hopper to the blowing head, the sand is transferred without clogging, and it can also be seen that when an angle of slump of the crushed sand transferred into the blowing head is checked, the crushed sand is uniformly distributed into a triangular shape. This means that the crushed sand is filled to one end of a nozzle and there is no fluidity problem. In addition, according to a casting evaluation result, an initial handling strength was good at casting, and a surface drop and core span damage was not observed after casting. Moreover, it can be observed that there is no external appearance defect. Fig. 8 is a diagram illustrating an external appearance of a final product produced by casting with a core manufactured according to examples. According to a sand removal and sand calcination evaluation result, no crushed sand was observed in the casting product after sand removal and sand calcination did not occur. Figure 9 illustrates that part of an internal appearance when a casting product is cut as shown in Figure 8 if the casting product having a shape as illustrated in Figure 8 is obtained by casting with a fabricated core. according to the example as shown in Figure 6. It was confirmed that sand calcination did not occur both in the removal of mechanical sand and the removal of chemical sand. This means that sand calcination is improved because of the properties of the inorganic binder. In addition, referring to Table 4, when a core is made according to Example 3, the core exhibits excellent core molding properties such as fluidity, filling capacity, mechanical strength, and toughness. water and excellent casting properties such as flowability and ability to sand removal (sand calcination). As a result, it can be seen that it is possible to manufacture the core having great ease of use in a casting operation with excellent quality. According to the method of manufacturing a core using an inorganic binder of the present disclosure, it is easy to perform a casting operation. In addition, it is easy to remove the sand from a casting product made by the casting operation 30 and also, no calcination phenomenon of sand occurs. In addition, the casting product made by the inorganic binder core manufacturing method of the present disclosure has excellent surface quality and formability and also exhibits improved mechanical strength and filling ability. [Table 4] Classification Comparative Evaluation Use of Binder Use of Inorganic A-1 Binder of Example 2 Core Molding Liquidity oo OA Capacity Fill Resistance o A Mechanical Water Resistance o A Surface Quality oo Plugging nozzle o X Casting Flowability oo Ability to o At sand removal (sand calcination) Roughness oo Product failure o Oo gas generation (o: good, A: normal, X: bad) Also, according to the In the present disclosure, a curing process can be carried out at a low temperature and without any toxic substance being generated, and thus, a working environment is maintained in good condition. In addition, only a small amount of gas is generated during a core manufacturing process and casting process, and thus casting defects are reduced, and it does not need to install a system. environmental pollution, and so, we can reduce manufacturing costs.
    [0015] While the present disclosure has been described with respect to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications may be practiced without departing from the spirit and scope of the invention as defined in the following claims.
    权利要求:
    Claims (16)
    [0001]
    REVENDICATIONS1. A method of making a core using an inorganic binder, comprising: a step of providing original sand in which original molding sand is supplied to a grinding wheel; a grinding step in which the original molding sand is mixed and ground with a liquid inorganic binder including water glass and ground sand is prepared by the grinding wheel; a sand transfer step in which the crushed sand is transferred from the grinding wheel to a ground sand hopper; a sand supplying step in which the crushed sand is supplied from the ground sand hopper to a blowing head positioned under the crushed sand hopper; a blowing step in which the ground sand provided in the blowing head is blown into a core mold; a gas evacuation step in which the interior of the core mold is evacuated and depressurized; a hardening step in which after the core mold is preheated, the interior of the blown core is hardened and calcined; and an extraction step in which the core mold is separated and the hardened core is extracted, characterized in that the inorganic binder includes the water-soluble glass at 40 to 70 parts by weight, of the nanosilica at 5 to 35 parts by weight, a Li-based water-resistant additive in an amount of 0.1 to 10 parts by weight, an organic silicon compound in an amount of 0.1 to 10 parts by weight, and an anti-chemical additive. sand calcination at 1 to 10 parts by weight.
    [0002]
    A method of making a core using an inorganic binder according to claim 1, characterized in that the inorganic binder is mixed in an amount of 1 to 6% by weight, based on the original molding sand.
    [0003]
    3. Process for producing a core using an inorganic binder according to claim 1, characterized in that the Li-based water-resistant additive includes one or more elements selected from lithium carbonate, silicate of lithium, lithium hydroxide, lithium sulphate, lithium bromide and lithium acetate.
    [0004]
    4. A method of manufacturing a core using an inorganic binder according to claim 1, characterized in that the organic silicon compound includes one or more elements selected from methyltriethoxysilane, sodium methylsiliconate, methyltrimethoxysilane, potassium methylsiliconate , butyltrimethoxysilane and vinyltrimethoxysilane.
    [0005]
    5. Process for producing a core using an inorganic binder according to claim 1, characterized in that the sand anti-calcination additive includes one or more elements selected from monosaccharides, polysaccharides, and disaccharides.
    [0006]
    A method of making a core using an inorganic binder according to claim 1, characterized in that the step of providing original sand includes: a step of supplying the original sand measured at a predetermined amount of a top mold sand storage hopper of origin to a lower sand measurement hopper; and a step of supplying the original sand from the bottom sand measuring hopper to the grinding wheel.
    [0007]
    A method of making a core using an inorganic binder according to claim 6, characterized in that the grinding step includes: a grinding step of the original molding sand supplied from the upper measuring hopper grit sand for 10 to 60 seconds; anda step of preparing crushed sand fed to an inorganic binder from a grinding binder supply device and grinding the inorganic binder for 30 to 120 seconds.
    [0008]
    A method of manufacturing a core using an inorganic binder according to claim 1, characterized in that in the sand supplying step, the ground sand is supplied from the ground sand hopper to the positioned blowing head. under the ground sand hopper, and the crushed sand supplied is dispensed at an upper end of a blast nozzle plate by a ground sand flux guide positioned at a lower end within the blowing head.
    [0009]
    A core made using an inorganic binder by the method of making a core using an inorganic binder according to any one of claims 1 to 8.
    [0010]
    Core manufactured using an inorganic binder according to claim 9, characterized in that when the core is exposed to an environmental condition with an absolute humidity of 20 to 30 g / m 3 for 3 hours, the core has a flexural strength. 60% or more with respect to initial flexural strength.
    [0011]
    Core manufactured using an inorganic binder according to claim 10, characterized in that the initial bending strength of the core is 150 N / cm 2 or more.
    [0012]
    A process for producing a casting product with a core using an inorganic binder, comprising: a step of storing a core using an inorganic binder manufactured by the method of manufacturing a core according to any one of the claims 1 to 8; a pouring step of making a product by pouring molten metal of a predetermined material into a mold formed into a predetermined shape using the stored core; a mechanical sand removal step of removing the core used in the pouring step; and a heating step including a water quenching process of the product from which the sand has been removed, characterized in that in the quenching process of the heating step, chemical sand removal is performed adding a chemically hydrolyzed solution to hydrolyze the inorganic binder remaining in the core after the mechanical sand removal step.
    [0013]
    13. A process for producing a casting product with a core using an inorganic binder according to claim 12, characterized in that the chemically hydrolyzed solution is a silicate solution including sodium silicate or sodium metasilicate, or a phosphate solution including sodium phosphate or disodium phosphate.
    [0014]
    14. A casting product made by the process of claim 12.
    [0015]
    A core manufacturing system using an inorganic binder, including: an upper hopper configured to store original molding sand; a bottom sand hopper connected to a lower portion of the upper hopper and configured to be supplied with original molding sand from the upper hopper, measuring the original molding sand to a predetermined amount, and provide the original molding sand to a grinding wheel; an inorganic binder supply device configured to supply an inorganic binder stored in a predetermined amount to the grinding wheel; a grinding wheel connected to the lower sand and grinding hopper and configured to mix and grind the original molding sand supplied from the sand bottom hopper with the inorganic binder supplied from the grinding device; supplying inorganic binder; a ground sand hopper configured to be fed with crushed sand from the grinding wheel and supplying ground sand to a blowing head; the blowing head positioned under the crushed sand hopper and configured to feed crushed sand from the crushed sand hopper and blow the crushed sand into a core mold; and the core mold configured to harden and calcine ground sand blown from the blow head, characterized in that the inorganic binder includes water-soluble glass of 40 to 70 parts by weight, nanosilica to 35 parts by weight, a Li-based water-resistant additive of from 0.1 to 10 parts by weight, an organic silicon compound of from 0.1 to 10 parts by weight, and an anti-blocking additive. calcination of the sand at a level of 1 to 10 parts by weight.
    [0016]
    A core manufacturing system using an inorganic binder according to claim 15, characterized in that the blowing head includes a sand flux guide ground at a lower end within the blowing head, and further includes a blow nozzle plate including a blow nozzle at a lower end of the crushed sand flow guide.
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    同族专利:
    公开号 | 公开日
    JP2017536243A|2017-12-07|
    HK1212292A1|2016-06-10|
    MX2017008834A|2017-11-15|
    US20160207099A1|2016-07-21|
    CN105057600B|2016-11-30|
    US9433999B2|2016-09-06|
    CA2910461C|2017-08-15|
    ITUB20159337A1|2017-06-21|
    FR3031687B1|2022-01-28|
    WO2016117791A1|2016-07-28|
    JP6456501B2|2019-01-23|
    CA2910461A1|2016-07-20|
    CN105057600A|2015-11-18|
    DE102015118160A1|2016-07-21|
    KR101515572B1|2015-04-29|
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    法律状态:
    2016-12-21| PLFP| Fee payment|Year of fee payment: 2 |
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    2019-10-28| PLFP| Fee payment|Year of fee payment: 5 |
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    2021-09-03| PLSC| Publication of the preliminary search report|Effective date: 20210903 |
    2021-11-29| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    KR1020150009546A|KR101515572B1|2015-01-20|2015-01-20|Manufacturing method of core and casting product using inorganic binder|
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