• 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 invention relates to an injection molding method, wherein a medium is injection molded into a recess of a body (303), the body (303) being actuated with a force to deform the recess to form a undercut which mechanically holds the injection molded medium. The invention further relates to a component (Fig. 3)
    公开号:SE1250288A1
    申请号:SE1250288
    申请日:2012-03-22
    公开日:2012-10-01
    发明作者:Karsten Horst；Ulf Behnke；Jeanine Wegner
    申请人:Bosch Gmbh Robert；
    IPC主号:
    专利说明:

    1015202530In a further aspect, there is provided a component comprising a body.
    The body has a recess which is closed in itself, the recess being one above the totalthe recess continuous undercut is formed to mechanically secure a seal.
    In particular, a closed recess in accordance with the present invention means thatthe recess shows no beginning and no end, but is closed as onecircle, the recess not necessarily having a circular shape.
    By forming an undercut over the total length of the recessa seal arranged in the recess is maintained over the total distance ofthe seal so that the seal is advantageously fastened particularly securely in the recess.
    The component and preferably the seal are produced in particular by means ofinjection molding process.
    According to one embodiment, the component comprises a sensor, in particular an airbagsensor. Preferably, the body is formed as a housing, the sensor being arranged inan interior space in the house. The house can to some extent also be described as a sensor house.
    According to a further embodiment, several sensors can also be arrangedThe sensors can be designed the same or different. The sensor is due to the safe anddurable attachment of the seal in the housing especially reliably protected from the exteriorinfluence, such as humidity.
    According to one embodiment, a mold cavity is applied to apply the force againstthe body. By means of a mold cavity, it is in particular possible to dose the force oncorresponding areas of the body in accordance with the requirements. The mold cavity isin this case usually shaped in accordance with the geometry of the body and exhibitsfor example, spammings, such as, in particular, a plug or a socketfasteners in the body.
    According to another embodiment, the recess is a sealing channel. The sealing channel isparticularly closed in itself. That is, it does not exhibit analogous to a circle or an ellipseno beginning and no end, whereby the geometry of the sealing channel does notshall be limited exclusively to a circle or an ellipse. The medium in particular forms oneseal, which by means of the deformed area, for example the undercut,safely kept resp. attached to the sealing channel.1015202530In a further embodiment, the medium is a thermoplastic elastomer (TPE). TPEexhibits in particular a high temperature resistance and a high weather stability, sothat the TPE seal even in difficult operating environments reliably provides a sealing function.
    In particular, by means of the seal, preferably the TPE seal, a seal of is formeda wet space versus a dry space. Furthermore, a flow property of TPEis set so that the injection step of TPE in the recess can be easily regulated inequivalent to the requirements.
    In a further embodiment, the medium is injected with an injection pressure between 450bar and 530 bar into the recess. This pressure range provides a specialfast and thereby cost-effective, then time-saving, injection so that athe corresponding component can be produced particularly cost-effectively. Preferablythe medium is injected for a time duration of about 0.5-1 s, in particular 0.65 s.
    According to another embodiment, the body is formed by an additional mediuminjection molded in a mold cavity for the body, in particular with an injection pressure of750-880 bar. Such a procedure can also be described as a 2K-injection molding process. In this case, "2K" stands for two components, i.e. a firstcomponent regarding the medium and a second component regarding it furtherthe medium. In particular, the first component may be a hard component,for example plastic. That is, preferably a plastic is injected into the mold cavity of the body. INin this context, the second component may be referred to as the soft component, iespecially when TPE is injection molded into the recess. So can advantageously in onetools, which in particular comprise the shape cavity of the body, a componentis made of two different materials, in particular a hard and a soft material. Especiallyengages in such a 2K injection molding process for a series production ofcomplex components, in particular components with a housing, in large numbers. Theit is preferably ensured that the two materials are sufficiently dimensionally stable beforethe body is removed from the mold cavity of the body. For example, one can be expectedpredetermined drying time before the mold cavity for the body is removed. A dimensional stabilitycan be achieved in particular with a precipitation hardening process. That is, boththe materials are precipitation hardened. The mold cavity for the body is then removed in particularonly from the body when the two materials are precipitation hardened. In general, it is1015202530further the means still sufficiently malleable when the medium is injected into the recess so thata deformation of the recess can be achieved particularly easily.
    The invention is explained in more detail below with the aid of preferred embodimentswith reference to the figures. Hereby showsFIG.
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    FIG.1111213a fl schematic diagram of an injection molding process,a flow chart of another injection molding process,a component,a sealing channel according to the prior art,an inventive sealing channel,a known component,an inventive component,a mold cavity,the mold cavity of Fig. 8,a technical construction drawing of an inventive component,a cross section of the component,the component of a vehicle door anda collision between two vehicles.
    In the following, the same reference numerals are used for similar features.1015202530Fig. 1 shows a flow chart of an injection molding process. In a step 101a medium is injected into a recess of a body, wherein according to a step 103the body is actuated by a force to deform the recess so that a sub-cutting is formed, which mechanically holds the medium. The force can be applied in particularbefore and / or during and / or after the injection of the medium into the recess.
    Fig. 2 shows a flow chart for another injection molding process. In a step 201injection molds a hard component, such as a plastic into a mold cavity for a body.
    The shape cavity of the body is a negative imprint of the body to be formed.
    The shape cavity of the body thus largely reflects a design of the body with one orseveral recesses, for example a sealing channel.
    In a step 203, a mold cavity is pressed against the hard component, i.e. the body.
    The mold cavity is a negative impression of the mold to be formed by the medium,which is now to be injected, for example a seal. The mold cavity thus occurs inin particular a design of the seal.
    In a step 205, it is increased by the mold cavity applied to the hard componentthe force so that the recess of the hard component is deformed. Especiallya mechanical material structure of the hard component is thereby compressed. P g athe sprain of the hard component is deformed, for example, a hitherto perpendicularchannel wall of the sealing channel to a bulging channel wall. Through this controlleddeformation can without an added mechanical slide of the injection molding tool aundercutting is formed on the hard component.
    In step 207, a medium, for example TPE, is then injection molded into the recess,for example the sealing channel. During injection, the mold cavity remains pressed againstthe hard component so that during the injection process of the medium it is affectedhard component further with a force. The medium is preferably injected for as long asthe recess, for example in the curved sealing channel, that it completely fillsthis. Thereby, the medium, which in particular can be a seal, obtains amechanical undercutting. This undercut produces a circumferentialmechanical attachment of the medium, in particular the TPE seal, to the hard onecomponent. The medium, in particular the seal, is thus advantageously secured1015202530from falling out. In an exemplary embodiment not shown, the force can also be applied beforeand / or during and / or after the injection of the medium into the recess.In particular, the use of TPE in the multicomponent injection molding process enablesmethod, in particular a 2K injection molding method, injection resp.spraying the hard component and the soft component into onework steps. So can advantageously a constructive integration of the softthe component on the thermoplastic component is carried out in a fully automaticprocess without an added working step, such as, for example, an assignment of the seal.
    In this way, for example, better beat times are achieved. Advantageously can alsomaterial is saved.
    The connection between the hard and the soft component resp. generally betweenthe medium and the body, are achieved by means of a mechanical anchorage, in particularby means of an undercut. Some chemical reaction between the two materials mustnot occur for the formation of an adhesive bond by chemical bonding between the hard onethe component and the soft component, for example TPE.
    Preferably, the hard component when injected into the mold cavity exhibitsthe body a temperature between 270 ° C and 290 ° C, in particular 270 ° C, preferably275 ° C, for example 280 ° C, in particular 285 ° C. A temperaturethe injection molding tool is preferably between 80 ° C and 100 ° C, in particular83 ° C, for example 85 ° C. Preferably, the soft component exhibits atinjection at a temperature of 230 ° C. Preferably, the mold cavity is pressed with onepressure of 70 bar against the hard component. According to one embodiment, ainjection pressure of the hard component is between 750 bar and 880 bar.
    Preferably, the hard component is injected for a period of a few seconds.preferably one second, preferably 1.09 s, into the mold cavity of the body. INin particular, the soft component is injection molded for a period of 0.5 s to a fewseconds, in particular 0.65 s, into the recess, in particular with an injection pressurebetween 450 bar and 530 bar. A cooling time in the first process step, ie atinjection of the hard component, is preferably 8 spost-pressure time at the first process step is, for example, 7 spressure time at a second process step, i.e. at the injection of the soft1015202530component, is in particular 1.6 s. A pressure in the first process step canpreferably be at 35 bar. Preferably, the injection molded component is driedfor 3 hours in particular at a temperature of 120 ° C.
    Fig. 3 shows a component 301. The component 301 has a body 303, which isshaped like a house. In particular, the housing 303 is formed of plastic. In an inner room (compareFig. 11) of the housing 303 may preferably have one or more sensors, in particularairbag sensors, be fitted. The house 303 can to a large extent also be described as onesensor housing. The housing 303 has a recess 307 formed on an upper surface 305as a sealing channel. The sealing channel 307 is closed in itself, thus showing no oneend and no beginning, and so far encloses at least partially the upper surface 305.
    In the sealing channel 307 a seal 309 is arranged, which is preferably formed ofTPE. Possible attachment possibilities of the seal 309 in the sealing channel 307 are shown inFig. 4 (according to the prior art) and 5 (according to the invention).
    The housing 303 has on its upper surface 305 a fine fastening bolt 311 with an outer thread.
    By means of the fastening bolt, in particular, a screwing of the housing into avehicle (not shown) arranged threaded bore (not shown). Further is on the upperthe surface 305 is provided with a mechanical anti-rotation device 313 having three plug-in pins 315.
    By means of the mechanical anti-rotation device 313 a mechanical anti-rotation device is providedupon attachment to the vehicle. That is, the housing 303 is rotatably attached and so far notcan be rotated longer in its mounting position. Furthermore, the housing 303 has ahousing plug 317, to which, for example, control and / or data lines (cf.Fig. 11) can be connected, in order to be able to read the sensors in particular.
    Fig. 4 schematically shows in the left drawing a section of the housing 303. The rightthe drawing in Fig. 4 shows a sectional view of the sealing channel 307. The sealing channel 307have perpendicular channel walls 401a and 401b, which run parallel to each other.
    No undercut has been formed so that any mechanical holding ofseal 309 is not possible. The seal 309 is thus not securely attached to the sealant.channel 307 and can thus easily fall out of the sealing channel 307.1015202530Fig. 5 shows, analogously to Fig. 4 in the left drawing, schematically a section fromthe housing 303. The right drawing in Fig. 5 shows a sectional view of the sealing channel 307.
    The sealing channel 307 has two parallel planes running parallel to each otherduct walls 501a and 501b, the duct walls 501a and 501b in the direction of thethe bulging upper surface 305 tapers so that the sealing channel 307 has aconstriction 503. This constriction 503 is not only formed locally in a definedarea of the sealing channel 307 but runs circumferentially over the total distanceof the sealing channel 307. With this circumferential constriction 503 acircumferential undercut, so that the seal 309 is mechanically held resp.anchored in the sealing channel 307 over its total distance. Thus, on is beneficialenable a secure attachment of the seal 309 and a failure of the seal 309from the sealing channel 307 is effectively avoided. A component 301 with that of Fig. 5The sealing channel 307 shown is to a large extent an inventive component.
    Preferably, such a component is manufactured by means of the inventionthe injection molding process.
    Fig. 6 shows in the left figure a known component 601 with a housing 603. The housing603 has a sealing channel 605. In the right drawing in Fig. 6 a sectional view ofthe sealing channel 605. For forming an undercut formed in the sealing channel 605606, two slides 607 are provided, which can also be referred to as slide pins. Bywear pins 607, a formation of undercut 606 in the sealing channel 605 is possible.
    However, the undercut 606 does not extend over the total distance ofthe sealing channel 605. Thus, no circumferential undercut 606 is possible.
    That is, there are areas in the sealing channel 605 which do not have anyundercut resp. narrowing. In these areas there is thus no mechanicalholding a seal 609 arranged in the sealing channel 605 is possible. Therebythe seal 609 is not held securely in the sealing channel 605 and can thus easily fall outthis.
    Furthermore, Fig. 6 shows two further slides 611 for forming the housing 603 and a slide614 for forming a plug 613.1015202530Fig. 7 shows an inventive component 701 with a housing 703. The housing 703has a sealing channel 705. Here too, analogously to Fig. 6, there are two slides 707 forforming the housing 703 and a slide 710 for forming a housing plug 709.
    The component 701 can in particular be formed by injection in a first process stepof plastic, for example, in the slides 707 and 710.In a second process step, a seal 711 (compare Fig. 8) is then injection molded inthe sealing channel 705, using a mold cavity 713. Fig. 8 shows only inthe middle drawing the mold cavity 713, which is shaped corresponding to that in itthe left drawing shows the component 701 and so far shows the correspondingrecesses 715. Component 701 is constructed analogously to component 301 iFigs. 3 and 5. So far, at least in part, the same reference numerals may be usedbe used. The mold cavity 713 is shown once again in Fig. 9.
    The right drawing in Fig. 8 shows in a sectional view the sealing channel 705 with injectionseal 711. During the injection process, the mold cavity 713 is pressed against the uppersurface 305. A force F thus acts on the housing 703, which force is so formed that the sealingthe channel 705 is deformed and analogous to the sealing channel 307 forms a constriction717 resp. undercut. Pressing by means of the mold cavity 713 resp. the impositionof a force is shown schematically by means of two arrows with the reference numeral 719.
    In particular, a mechanical material structure of the housing 703 is thereby compressed,which is indicated by several arrows with the reference numeral 721.
    Fig. 10 shows a technical construction drawing of an inventive component1001 with a house 1003 of a house back. The drawn dimensions are to be understood onlyas example. It is clear to a person skilled in the art that depending on the requirements, the dimensions canchange. The reference numeral 1005 denotes a housing plug1005. The reference numeral 1007 denotes a sealing channel. Withreference numeral 1009 denotes a nut and with reference numeralsthe designation 1011 a bolt. The nut here is an M6 nut. There are also other measuresconceivable, for example an M4 or an M8 nut. With the reference designation1011 is characterized by a material designation "PRT GF.30", which may be, for exampleembossed on the house. Reference numeral 1013 denotes support surfaces of the housing1003 during the manufacturing process. The sealing channel 1007 may have one or101520253010several embossing zones 1015, which in particular have an embossing of about 0.25 mmwidth and a circumferential inner diameter of about 0.5 mm and a circumferentialouter diameter of about 0.4 mm.
    Fig. 11 shows a cross section of the housing 303. With the reference numeral 1101denoted a nut which is screwed together for attachment of the housing 303 to a vehiclewith the bolt 311. The reference numerals 1103a and 1103b characterize eacha pin for an electrical contact with a printed circuit board 1105. Pins 1103a and 1103bare arranged in the housing plug 317.
    Arranged on the printed circuit board 1105 is a sensor 1107, which is preferablydesigned as an airbag sensor. The sensor 1107 is electrically connected tothe circuit board 1105. Via the two pins 1103a and 1103b is an electrical contact andcontrol of the sensor 1107 possible.
    Fig. 12 shows different views of the component 301 on a vehicle door 1201. The component301 is inserted into a recess 1203 formed in the vehicle door 1201 for attachment tothe vehicle door 1201, the recess 1203 being shaped corresponding to the geometry ofthe mechanical rotary lock 313. The three plug-in pins 315 abut against itthe edges of the recess 1203 so that a rotation of the component 301 is no longerPossible. When component 301 is inserted into the recess 1203, the nut is screwed on1101 on bolt 311 and then tightened. The seal 309 then rests against oneinside 1205 (compare Fig. 13) of the vehicle door 1201 and seals one ofthe vehicle door 1201 limited internal space towards an external environment resp. outer spaceat the vehicle. The interior can also be described as a dry room. The outer space canalso referred to as a wet room.
    Fig. 13 shows the component 301 of the vehicle door 1201 when an additional vehicle 1301collides with the vehicle door 1201. This collision is symbolized by atagged cloud with reference numeral 1303. By which the sealing channel307 has an undercut, which is preferably formed over the totalthe stretching of the sealing channel 307, the seal 309 is kept safe and reliablemechanically in the sealing channel 307 by means of the undercut. This is achievedthus a secure sealing of the inner space towards the outer space resp.11the digestive environment. The sensor 1107 is so far reliably protected against damaging exteriorsimpact and thus operationally ready. The sensor 1107 can thus preferably detectthe collision after which appropriate measures can be taken. For example, an airbag cantriggered.
    权利要求:
    Claims (8)
    [1]
    Injection molding method, wherein a medium is injection molded into a recess of a body (303), characterized in that the body (303) is actuated by a force to deform the recess to form a undercut which mechanically holds the injection molded medium.
    [2]
    The injection molding method according to claim 1, wherein a mold cavity (713) for applying the force is pressed against the body (303).
    [3]
    Injection molding method according to one of claims 1 or 2, wherein the recess is a sealing channel (307).
    [4]
    The injection molding method according to any one of the preceding claims, wherein the medium is a thermoplastic elastomer.
    [5]
    Injection molding method according to one of the preceding claims, wherein the medium is injected into the recess with an injection pressure between 450 bar and 530 bar.
    [6]
    The injection molding method according to any one of the preceding claims, wherein the body (303) is formed by injection molding an additional medium in a mold cavity for the body.
    [7]
    The injection molding method according to claim 6, wherein the additional medium is injection molded into the mold cavity of the body with an injection pressure between 750 bar and 880 bar.
    [8]
    Component (301) having a body (303) having a recess which is closed in itself, in which an undercut extending over the total recess is formed for mechanically holding a seal (309).
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    同族专利:
    公开号 | 公开日
    DE102012203636A1|2012-10-04|
    FR2973275A1|2012-10-05|
    US20120251782A1|2012-10-04|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    CA1328158C|1988-05-11|1994-04-05|Toshiyuki Kanai|Multi-injection molded body, a method of molding for the same, and a multi-injection molding machine|
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    FR2668095A1|1990-10-18|1992-04-24|Tabur Caoutchouc|Method for the overmoulding of at least one leakproof seal on a component, implementing tool and component fitted with such a seal|
    US5160474A|1990-12-21|1992-11-03|Cadillac Rubber & Plastics, Inc.|Overmolded gasket, heat exchanger tank incorporating the same and method for making the same|
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    DE19848246A1|1998-10-20|2000-04-27|Krauss Maffei Kunststofftech|Thermoplastic component, especially for motor vehicles or electrical equipment housings, has a groove with undercuts holding an elastomer seal|
    法律状态:
    2015-10-13| NAV| Patent application has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    DE102011006438|2011-03-30|
    DE201210203636|DE102012203636A1|2011-03-30|2012-03-08|Injection molding and component|
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