• 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:
    Process (1) for the production of abrasives (2, 3), comprising the following process steps: i. Providing a combustible reticulated or grid-shaped structure (4, 5), preferably made of plastic, with a plurality of openings (6, 7) on a support (10), preferably an endless carrier belt, ii. Providing a, preferably aluminum hydroxide-containing, starting mixture (8), which is convertible by sintering at least in alumina, wherein the starting mixture (8) is preferably flowable, iii. Filling the openings (6, 7) with the starting mixture (8), and iv. Sintering the net or latticed structure (4, 5) filled with the starting mixture (8).
    公开号:AT515229A1
    申请号:T969/2013
    申请日:2013-12-18
    公开日:2015-07-15
    发明作者:
    申请人:Swarovski Tyrolit Schleif；
    IPC主号:
    专利说明:

    The invention relates to a process for the production of abrasives.
    Such abrasives are incorporated, for example, in abrasive coatings, in solid abrasive or in abrasive papers. All known ceramic bonds and synthetic resin bonds can be considered as a bond for the abrasive article. The field of application of the abovementioned grinding tools is the grinding of steels, metals and alloys, plastics and wood.
    Different methods of making abrasive are known in the art. For example, WO 2011/087649 discloses a method in which a rotary shadow mask in combination with suppressor is used to make shaped ceramic material sections which are subsequently sintered. It is a technically very complex and maintenance-intensive process.
    The object of the present invention is to provide a simplified method for the production of abrasives.
    This object is achieved by the following method steps: i. Providing a combustible reticulated or latticed structure, preferably of plastic, having a plurality of openings on a support, preferably an endless support belt, ii. Providing a starting mixture, preferably containing aluminum hydroxide, which is convertible by sintering at least in alumina, the starting mixture preferably being flowable, iii. Filling the openings with the starting mixture, and iv. Sintering the net or grid-shaped structure filled with the starting mixture.
    One of the fundamental ideas of the process according to the invention is that during the sintering step, firstly the starting mixture is converted at least into alumina and secondly the net or lattice-shaped structure is burned, which results in automatic singulation of the abrasive particles so that the abrasive particles after sintering - at least for the most part - separate from each other.
    A significant advantage of the method of the invention over the prior art is that by choosing the shape of the mesh or lattice structure, the geometry and dimension of the abrasive particles can be readily determined. In addition, it is possible to rapidly and easily change the geometry and dimension of the abrasive particles produced by changing the mesh or lattice structure.
    It should be noted that the technique of converting a starting mixture, preferably containing aluminum hydroxide, by sintering, at least in aluminum oxide, has been known for some time. In this context, reference is made to the so-called "sol-gel process". If the starting mixture contains aluminum hydroxide, various modifications, e.g. Böhmit, come for use. Depending on the starting mixture, there may be incidences that besides alumina (typically alpha-alumina) secondary phases, e.g. Spinel, arise. This fact is reflected in the expression "at least in aluminum oxide".
    In an advantageous embodiment of the method, the net or latticed structure filled with the starting mixture is predried before sintering, preferably at a temperature between 50 ° C and 500 ° C, more preferably at a temperature between 150 ° C and 400 ° C. In this way, the mesh or lattice-like structure filled with the starting mixture can be converted into a state which, for example, allows the division into sections which are preferably plate-shaped. These sections can then be fed subsequently to the process step of the sinter.
    Alternatively or additionally, however, it is also possible for the net or lattice-like structure filled with the starting mixture to remain on the support and to carry out the sintering in a continuous furnace.
    The sintering is preferably carried out at a temperature between 1200 ° Celsius and 1800 ° Celsius, more preferably at a temperature between 1200 ° Celsius and 1500 ° Celsius.
    It is useful for the mesh or lattice structure to use a material which will burn completely at the sintering temperature, but at lower temperatures - e.g. in a possible pre-drying process - is heat resistant.
    Preferably, the mesh or latticed structure (one ply) provided on the support has a height less than or equal to 1.5 millimeters when viewed from the side. This height corresponds substantially to the thickness of the threads or ridges from which the net or lattice-shaped structure is advantageously constructed. In addition, this height determines the thickness of the abrasive particles present at the end of the manufacturing process, since the starting mixture, when it is flowable, will flow beyond the boundary of an opening in the form of the threads and into an adjacent opening when filling the openings. However, it must be taken into account that the thickness in the course of the sintering process still decreases, mainly due to the reduction in the proportion of liquid. It should be noted in general that net-shaped and grid-shaped structures differ in that net-shaped structures have nodes in contrast to grid-shaped structures.
    If it is a somewhat more viscous starting mixture, it may be provided as an alternative or supplementary measure to ensure a certain thickness of the abrasive particles such that the net or lattice structure filled with the starting mixture passes a gap having a predetermined height prior to sintering. This height is advantageously adjusted to or slightly above the height of the net or lattice structure provided on the support, or the thickness of the filaments of the net or lattice structure, so that the starting mixture is evenly etched into the apertures.
    Polygons, preferably diamonds, squares or triangles, are suitable as geometries for the openings of the mesh or latticed structure.
    Depending on the choice of concrete process parameters, it may occur that the sintered products or abrasive particles obtained by sintering are still occasionally connected to one another via webs or the like. In these cases, it is advantageous to supply the sintered products obtained by the sintering to a separating device, preferably a vibrating device.
    Further advantages and details of the invention will become apparent from the figures and the associated description of the figures. Showing:
    Fig. 1 is a schematic representation of the invention
    Method in the form of a flowchart,
    2a and 2b show two advantageous embodiments of the invention with reference to schematics,
    FIGS. 3a and 3b show two possible network or lattice structures used in the method, and FIGS
    FIGS. 4a and 4b show two possible abrasive particles which can be produced by means of the method according to the invention.
    FIG. 1 shows, by means of a flow chart, the four basic method steps of the method 1 according to the invention for producing abrasive, namely i. the provision of a combustible reticulate or grid-shaped structure, preferably of plastic, with a plurality of openings on a support, preferably an endless carrier fire, ii. providing a starting mixture, preferably comprising aluminum hydroxide, which is convertible by sintering at least in aluminum oxide, the starting mixture preferably being flowable, iii. filling the openings with the starting mixture, and iv. sintering the network or lattice-shaped structure filled with the starting mixture.
    The technical implementation of this method can be achieved in different ways, wherein two particularly preferred embodiments are shown in Figures 2a and 2b:
    In the case of FIG. 2a, the combustible reticulated or grid-shaped structure 4 is provided on a support in the form of an endless carrier strip 10 by unwinding the reticulated structure 4 from a roller 15. The angular velocity of this roller 15 and the speed of the endless carrier strip 10 are coordinated with each other, to ensure unimpeded unwinding of the mesh or latticed structure 4.
    The Endlosträgerband 10 is guided over the rolling elements 16 and 17.
    After providing the combustible mesh or lattice-like structure 4, which in this case is made of plastic, the openings 6 thereof (see Fig. 3a) are filled with a flowable starting mixture 8, which is sintered at least in aluminum oxide (and, as stated above, in any case) Nebenphasen) is feasible, and which contains in this case predominantly aluminum hydroxide, filled. For this purpose, the starting mixture 8 is poured onto the net or lattice-shaped structure 4. The net or grid-shaped structure 4 filled with the starting mixture 8 then passes through a gap 13, the height of which substantially corresponds to the height 18 of the net or grid-shaped structure 4 provided in a single layer on the carrier 10.
    The net or grid-shaped structure 4 filled with the starting mixture 8 is finally transported by means of the endless carrier belt 10 through a continuous furnace 14, in which the drying process or the sintering takes place. In the process, the portions of the starting mixture 8 which are located in the openings of the mesh or lattice-shaped structure 4 are sintered to form alumina particles. At the same time, the mesh or grid-shaped structure 4 burns. That is, following the sintering step, the abrasive particles 2 according to the given geometry of the mesh or latticed structure 4 on the
    Endless carrier belt 10 is present. Finally, the abrasive particles 2 are collected in a sump.
    In the case of the embodiment of the method according to the invention diagrammatically shown in FIG. 2b, the two method steps "providing a combustible reticulate or lattice-like structure" and "filling the apertures thereof" are carried out in the same way as in the embodiment shown in FIG. 2a. However, the mesh or grid-shaped structure 5 filled with the starting mixture 8 is then pre-dried before sintering by means of a heating device 19, at a temperature between 150 ° Celsius and 400 ° Celsius. At this temperature, the mesh or grid-shaped structure 5 is heat-resistant. Predrying removes liquid from the starting mixture so that it is less flexible and sticks to the mesh or lattice structure. Therefore, the net or grid-shaped structure 5 filled with the starting mixture 8 can be subdivided by means of a suitable device into plate-shaped sections 9, which are subsequently fed to a sintering furnace 20.
    The sintering furnace 20 again carries out the sintering step, wherein the starting mixture 8 is converted at least into aluminum oxide and any secondary phases and at the same time the net or lattice-shaped structure 5 is burned, so that a separation of the abrasive particles 3 occurs during sintering.
    As already stated, the geometry of the mesh or lattice-shaped structure allows the geometry of the abrasive particles produced by the process to be determined. FIGS. 3a and 3b show two exemplary network geometries, namely, in the case of FIG. 3a, a mesh or lattice-shaped structure 4 whose openings are diamond-shaped, and, in the case of FIG. 3, a mesh or lattice-shaped structure 5 whose openings are square-shaped. The threads or webs 11 and 12 of the mesh or latticed structure 4 bzw.5 have a thickness of less than or equal to 1.5 millimeters. The mesh or latticed structures 4 and 5 can be used both in the embodiment according to FIG. 2a and in the embodiment according to FIG. 2b. It is also conceivable to use a mesh or grid-shaped structure having openings with different geometries, and thus to produce a mixture of abrasive particles with correspondingly different geometries.
    Figures 4a and 4b show two examples of abrasive particles that can be made by the method, wherein the particle 2 in Figure 4a has a diamond shape with a given edge length 22 and the particle 3 in Figure 4b has a square shape with a given edge length 24. These geometries of the abrasive particles 2 and Figure 3 corresponds to the grid geometries shown in Figures 3a and 3b. The thickness 25 or 26 of the abrasive particles is smaller than the thickness of the threads or webs of the mesh or lattice-like structure due to the liquid removal during the sintering process.
    权利要求:
    Claims (10)
    [1]
    Claims 1. A method (1) for producing abrasive (2,3) characterized by the following steps: i. Providing a combustible reticulated or grid-shaped structure (4, 5), preferably made of plastic, with a plurality of openings (6, 7) on a carrier (10), preferably an endless carrier belt, ii. Providing a starting mixture (8), preferably containing aluminum hydroxide, which is convertible by sintering at least into aluminum oxide, the starting mixture (8) preferably being flowable, iii. Filling the openings (6, 7) with the starting mixture (8), and iv. Sintering the network or lattice-like structure (4, 5) filled with the starting mixture (8).
    [2]
    2. Method (1) according to claim 1, characterized in that the net or latticed structure (4, 5) filled with the starting mixture (8) is predried before sintering, preferably at a temperature between 50 ° C and 500 ° C, more preferably at a temperature between 150 ° C and 400 ° C.
    [3]
    3. Method (1) according to claim 1 or 2, characterized in that with the starting mixture (8) filled net or lattice-shaped structure (4, 5) prior to sintering in, preferably plate-shaped sections (9) is divided.
    [4]
    4. Method (1) according to one of claims 1 to 3, characterized in that the sintering is carried out in a continuous furnace (14).
    [5]
    5. The method (1) according to any one of claims 1 to 4, characterized in that the sintering at a temperature between 1200 ° C and 1800 ° C, preferably at a temperature between 1200 ° C and 1500 ° C, is performed.
    [6]
    6. The method (1) according to any one of claims 1 to 5, characterized in that the filling of the openings (6, 7) of the mesh or lattice-shaped structure (4, 5) takes place substantially by casting.
    [7]
    7. The method (1) according to any one of claims 1 to 6, characterized in that the provided on the support net or lattice-shaped structure (4, 5) viewed from the side has a height (18) less than or equal to 1.5mm.
    [8]
    Method (1) according to any one of claims 1 to 7, characterized in that the mesh or lattice-like structure (4, 5) filled with the starting mixture (8) passes a gap (13) of a predetermined height prior to sintering.
    [9]
    9. The method (1) according to any one of claims 1 to 8, characterized in that the openings (6, 7) of the mesh or lattice-shaped structure (4, 5) are polygonal, preferably diamond-shaped, square or triangular, are formed.
    [10]
    Method (1) according to any one of Claims 1 to 9, characterized in that the sintered products obtained by sintering are supplied to an individualizing device, preferably a vibrating device.
    类似技术:
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    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA969/2013A|AT515229B1|2013-12-18|2013-12-18|Process for the production of abrasives|ATA969/2013A| AT515229B1|2013-12-18|2013-12-18|Process for the production of abrasives|
    PCT/AT2014/000214| WO2015089528A1|2013-12-18|2014-12-02|Method for the production of abrasive|
    EP14828436.7A| EP3083026A1|2013-12-18|2014-12-02|Method for the production of abrasive|
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