JP3569858B2 - Integral molding method of gasket for resin parts - Google Patents

Integral molding method of gasket for resin parts Download PDF

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Publication number
JP3569858B2
JP3569858B2 JP20745495A JP20745495A JP3569858B2 JP 3569858 B2 JP3569858 B2 JP 3569858B2 JP 20745495 A JP20745495 A JP 20745495A JP 20745495 A JP20745495 A JP 20745495A JP 3569858 B2 JP3569858 B2 JP 3569858B2
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JP
Japan
Prior art keywords
gasket
groove
gasket groove
silicon
compression ratio
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP20745495A
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Japanese (ja)
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JPH0932925A (en
Inventor
政眞 松尾
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Aichi Machine Industry Co Ltd
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Aichi Machine Industry Co Ltd
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Filing date
Publication date
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Priority to JP20745495A priority Critical patent/JP3569858B2/en
Publication of JPH0932925A publication Critical patent/JPH0932925A/en
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Publication of JP3569858B2 publication Critical patent/JP3569858B2/en
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  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Description

【0001】
【産業上の利用分野】
この発明は、樹脂部品に対するガスケットの一体成形法に関するものである。
【0002】
【従来の技術及びその課題】
従来、図4に示すような樹脂部品1に形成されたガスケット溝2内にガスケットを一体成形させるに際し、この樹脂部品1を一方の型とみなして、この樹脂部品1に密封型5を図5のように密着整合させて、密封型5に形成されている成形空間K内に2液混合熱硬化型のシリコンを充填して、前記ガスケット溝2内にシリコンによるガスケットGを一体形成するのであるが、前記密封型5には一対の突起51,51が形成されており、この突起51,51が前記ガスケット溝2の周囲に配置され、密封型5と樹脂部品1を型締めする力により、樹脂部品1が高温の状態であるため、この突起51,51を介しガスケット溝2の開口側すなわち成形空間K側が塑性変形されて、開口側の幅h2がガスケット溝2の底の幅h1よりも狭小となり、これによりガスケットGの脱落防止を図っている。
【0003】
このような従来方法においては、ガスケット溝2の周囲を機械的に塑性変形させるため、密封型5の突起51,51を当接させるスペースが樹脂部品1側に必要であり、樹脂部品1が極めて小さい部品である場合にはこのような突起51,51を当接させるスペースがないため、このような方法は使用できないという問題点があった。
また、樹脂部品1を高温の状態としてシリコンを充填させるものであり、設備が大型化して専用機械が必要であるという問題点があった。
また、成形させるガスケットGの圧縮率を一定範囲に収めるために図6のような専用のスペーサー52,52を設ける必要があり、構造が複雑となってコストアップしてしまうという問題点もあった。
【0004】
【課題を解決するための手段】
本発明は上記従来の問題点に鑑み案出したものであって、専用機械等を必要とせず、また小さな樹脂部品であっても良好にガスケットを一体成形することのできる成形法を提供せんことを目的とし、その要旨は、樹脂部品に形成されたガスケット溝内に2液混合熱硬化シリコンを充填してガスケットを前記ガスケット溝内に一体成形する成形法であって、前記樹脂部品のガスケット溝の開口側に該ガスケット溝より大径の係合溝を該ガスケット溝と同心状に形成し、前記樹脂部品に密着整合される密封型には、前記係合溝に密着係合し前記ガスケット溝より僅かに小径の成形空間を形成する圧縮率規制突起を突設し、該圧縮率規制突起を前記係合溝に密着係合させた状態で前記ガスケット溝及び成形空間内にシリコンを加圧充填し、シリコンの硬化するまで加圧力を維持することである。
【0005】
【作用】
樹脂部品側に形成された係合溝内に、密封型に形成された圧縮率規制突起を密着係合させて、この状態で成形空間及びガスケット溝内にシリコンを圧入し、硬化するまで加圧し続けることにより、ガスケット内部にガスケット溝の内壁への加圧力が発生して、これにより強固にガスケットをガスケット溝内に固着させて脱落防止を図ることができる。
【0006】
【実施例】
以下、本発明の実施例を図面に基づいて説明する。
図1は、樹脂部品1に密封型5を用いて、ガスケット溝2内にガスケットを一体成形する際の、樹脂部品1と密封型5の要部分解断面構成図であり、樹脂部品1には所定位置にガスケット溝2が形成されており、このガスケット溝2の上面開口側には、このガスケット溝2よりも大径の係合溝3がガスケット溝2と同心状に形成されており、樹脂部品1の上面側はシール面4を形成している。
【0007】
一方、このシール面4に密着整合するシール面5aを有する密封型5には、2液混合熱硬化シリコンを外部より注入する注入口7が形成されており、この注入口7の内端側には成形空間Kが形成され、この成形空間Kの両側には下方へ突出して圧縮率規制突起6,6が突出形成されたものとなっており、この圧縮率規制突起6,6は前記係合溝3内に密着状に係合できる寸法に形成され、密封型5が樹脂部品1と整合一体化された時には、圧縮率規制突起6,6が係合溝3の内壁または底壁に密着状となってシール性が確保されるものとなっている。
【0008】
なお、圧縮率規制突起6,6内の成形空間Kは前記ガスケット溝2の幅寸法よりも僅かに小径なものとなっており、図2のように密封型5を整合させた状態では、前記圧縮率規制突起6,6がガスケット溝2の上面開口端に被せ状に配置される。この図2の状態から、前記注入口7より2液混合熱硬化シリコンを加圧状態で注入すると、シリコンは成形空間K内に充填され、かつガスケット溝2内に充填されて内部で硬化されてガスケットGが形成されるが、シリコンが硬化するまでの間は加圧力を継続させることにより、成形されるガスケットGの内部にはガスケット溝2の内周側面に対し押圧力が発生することとなり、このガスケット内部で発生するガスケット溝2の内周側面に対する加圧押圧力により、ガスケットGは強固にガスケット溝2内に固着状態となり、ガスケットGが抜脱することがない。
なお、樹脂部品1より密封5を脱型した状態では、図3に示すように、ガスケットGの上端側の外周には適度な空間Sが形成されることとなり、この空間Sは使用時にガスケットGが良好に圧縮される圧縮空間となり得るものである。
【0009】
このように本例では、シリコンを加圧注入し加圧力を持続させる段階で、ガスケット内部に発生する膨脹力により強固にガスケット溝2内にガスケットGを固着させるものであり、従来のような突起51,51によりガスケット溝2を塑性変形させてガスケットの抜脱防止を図るものではないため、突起51,51が不要であり、従って、樹脂部品1が小さい部品であっても良好にガスケット溝2内にガスケットGを一体成形させることができるものとなる。また、圧縮率規制突起6によりガスケットGの圧縮率が適度に規制されるため、従来のようなスペーサー52は不要となり、構造が単純で、大型の専用機等を必要とせず、コストを低減させてガスケットを一体成形することができる。
【0010】
【発明の効果】
本発明は、樹脂部品に形成されたガスケット溝内に2液混合熱硬化シリコンを充填してガスケットを前記ガスケット溝内に一体成形する成形法であって、前記樹脂部品のガスケット溝の開口側に該ガスケット溝より大径の係合溝を該ガスケット溝と同心状に形成し、前記樹脂部品に密着整合される密封型には、前記係合溝に密着係合し前記ガスケット溝より僅かに小径の成形空間を形成する圧縮率規制突起を突設し、該圧縮率規制突起を前記係合溝に密着係合させた状態で前記ガスケット溝及び成形空間内にシリコンを加圧充填し、シリコンの硬化するまで加圧力を維持することによりガスケットを一体成形するものであり、シリコンを加圧注入し加圧力を持続させる段階で、ガスケット内部に発生する膨脹力により強固にガスケット溝内にガスケットを固着させ、ガスケットの抜脱を良好に防ぐことができるものとなり、従来のような専用機等を必要とせず、コストを低減させ、かつ小型の樹脂部品に対しても良好にガスケット溝内にガスケットを一体成形させることが可能となる効果を有する。
【図面の簡単な説明】
【図1】樹脂部品と密封型の要部分解断面構成図である。
【図2】図1の密封型を樹脂部品に整合させた状態の断面構成図である。
【図3】ガスケット溝内に一体成形されたガスケットの要部断面図である。
【図4】従来の樹脂部品の全体断面図である。
【図5】従来のガスケットの一体成形法の密封型の整合状態の断面構成図である。
【図6】従来の成形法によるスペーサーの説明図である。
【符号の説明】
1 樹脂部品
2 ガスケット溝
3 係合溝
4 シール面
5 密封型
5a シール面
6 圧縮率規制突起
7 注入口
K 成形空間
G ガスケット
S 空間
[0001]
[Industrial applications]
The present invention relates to a method for integrally forming a gasket on a resin component.
[0002]
[Prior art and its problems]
Conventionally, when a gasket is integrally formed in a gasket groove 2 formed in a resin component 1 as shown in FIG. 4, the resin component 1 is regarded as one type, and a sealing mold 5 is attached to the resin component 1 in FIG. The two-part mixed thermosetting silicone is filled into the molding space K formed in the sealed mold 5 as described above, and the gasket G made of silicon is integrally formed in the gasket groove 2. However, a pair of projections 51, 51 are formed on the sealing mold 5, and the projections 51, 51 are arranged around the gasket groove 2, and the force for clamping the sealing mold 5 and the resin component 1 is used. Since the resin component 1 is in a high temperature state, the opening side of the gasket groove 2, that is, the molding space K side is plastically deformed via the projections 51, 51, and the width h2 on the opening side is larger than the width h1 at the bottom of the gasket groove 2. Narrowed, Thereby achieving the captive gasket G by Les.
[0003]
In such a conventional method, the periphery of the gasket groove 2 is mechanically plastically deformed, so that a space for contacting the projections 51, 51 of the sealing mold 5 is required on the resin component 1 side. In the case of small components, there is no space for bringing the protrusions 51 into contact with each other, so that there is a problem that such a method cannot be used.
Further, since the resin component 1 is filled with silicon in a high temperature state, there is a problem that the equipment becomes large and a dedicated machine is required.
Further, it is necessary to provide dedicated spacers 52, 52 as shown in FIG. 6 in order to keep the compression ratio of the gasket G to be formed within a certain range, and there is a problem that the structure becomes complicated and the cost increases. .
[0004]
[Means for Solving the Problems]
The present invention has been devised in view of the above-described conventional problems, and does not require a special machine or the like, and does not provide a molding method capable of integrally molding a gasket even with a small resin part. The gist of the present invention is to provide a molding method in which a gasket groove formed in a resin component is filled with a two-component mixed thermosetting silicone and a gasket is integrally formed in the gasket groove. An engaging groove having a diameter larger than that of the gasket groove is formed concentrically with the gasket groove on the opening side of the gasket groove. A compression ratio regulating projection that forms a molding space with a slightly smaller diameter is protruded, and silicon is pressure-filled into the gasket groove and the molding space in a state where the compression ratio regulating projection is closely engaged with the engagement groove. And silicon It is to maintain the pressure until hardened.
[0005]
[Action]
A compression ratio regulating projection formed in a sealed mold is brought into close contact with the engagement groove formed on the resin component side, and in this state, silicon is pressed into the molding space and the gasket groove and pressurized until it is cured. By continuing, a pressing force is applied to the inner wall of the gasket groove inside the gasket, whereby the gasket can be firmly fixed in the gasket groove to prevent the gasket from falling off.
[0006]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded cross-sectional configuration view of a main part of the resin component 1 and the sealing die 5 when a gasket is integrally formed in the gasket groove 2 using the sealing die 5 for the resin component 1. A gasket groove 2 is formed at a predetermined position, and an engagement groove 3 having a larger diameter than the gasket groove 2 is formed concentrically with the gasket groove 2 on the upper surface opening side of the gasket groove 2. The upper surface of the component 1 forms a sealing surface 4.
[0007]
On the other hand, a sealing die 5 having a sealing surface 5a closely contacting and aligning with the sealing surface 4 is provided with an injection port 7 for injecting the two-component mixed thermosetting silicon from the outside. Is formed with a molding space K. On both sides of the molding space K, compression ratio regulating projections 6 and 6 are formed so as to protrude downward. When the sealing die 5 is integrated with the resin component 1 so as to be tightly engaged in the groove 3, the compression ratio regulating projections 6, 6 are in close contact with the inner wall or the bottom wall of the engagement groove 3. Thus, the sealing property is ensured.
[0008]
The molding space K in the compression ratio regulating projections 6, 6 has a slightly smaller diameter than the width dimension of the gasket groove 2. When the sealing mold 5 is aligned as shown in FIG. The compression ratio regulating projections 6, 6 are arranged so as to cover the open end of the upper surface of the gasket groove 2. When the two-component mixed thermosetting silicon is injected under pressure from the injection port 7 from the state of FIG. 2, the silicon is filled in the molding space K, and is also filled in the gasket groove 2 and hardened inside. The gasket G is formed, but by continuing the pressing force until the silicon is cured, a pressing force is generated inside the gasket G to be formed against the inner peripheral side surface of the gasket groove 2. The gasket G is firmly fixed in the gasket groove 2 due to the pressing force applied to the inner peripheral side surface of the gasket groove 2 generated inside the gasket, and the gasket G does not come off.
When the seal 5 is removed from the resin component 1, an appropriate space S is formed on the outer periphery on the upper end side of the gasket G as shown in FIG. Can be a compression space that can be satisfactorily compressed.
[0009]
As described above, in this example, the gasket G is firmly fixed in the gasket groove 2 by the expansion force generated inside the gasket at the stage where silicon is pressurized and injected to maintain the pressing force. Since the gasket groove 2 is not plastically deformed by the parts 51 and 51 to prevent the gasket from being pulled out, the projections 51 and 51 are unnecessary. Therefore, even if the resin part 1 is a small part, the gasket groove 2 can be satisfactorily formed. The gasket G can be integrally formed therein. In addition, since the compression ratio of the gasket G is appropriately regulated by the compression ratio regulating projection 6, the spacer 52 as in the related art is not required, the structure is simple, the large dedicated machine is not required, and the cost is reduced. The gasket can be integrally molded.
[0010]
【The invention's effect】
The present invention relates to a molding method in which a gasket groove formed in a resin component is filled with two-component mixed thermosetting silicon and a gasket is integrally molded in the gasket groove. An engagement groove having a diameter larger than that of the gasket groove is formed concentrically with the gasket groove, and for a sealed type that is tightly aligned with the resin component, the engagement groove is closely engaged with the engagement groove and has a slightly smaller diameter than the gasket groove. The compression ratio regulating projections which form the molding space are projected, and the gasket groove and the molding space are pressurized and filled with silicon in a state where the compression ratio regulating projections are in close contact with the engagement grooves, and the silicon The gasket is integrally formed by maintaining the pressing force until it is hardened, and at the stage of injecting silicon under pressure and maintaining the pressing force, the expansion force generated inside the gasket firmly inserts it into the gasket groove. The gasket can be satisfactorily prevented by removing the gasket by fixing the skeet.This eliminates the need for a dedicated machine as in the past, reduces the cost, and satisfactorily fits in the gasket groove even for small resin parts. This has the effect that the gasket can be integrally molded.
[Brief description of the drawings]
FIG. 1 is an exploded cross-sectional configuration view of a main part of a resin component and a sealed type.
FIG. 2 is a sectional view showing a state in which the sealed mold of FIG. 1 is aligned with a resin component.
FIG. 3 is a sectional view of a main part of a gasket integrally formed in a gasket groove.
FIG. 4 is an overall sectional view of a conventional resin component.
FIG. 5 is a cross-sectional configuration view of a conventional gasket integrated molding method in a sealed mold alignment state.
FIG. 6 is an explanatory view of a spacer formed by a conventional molding method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Resin part 2 Gasket groove 3 Engagement groove 4 Seal surface 5 Seal type 5a Seal surface 6 Compression rate regulation projection 7 Injection port K Molding space G Gasket S space

Claims (1)

樹脂部品に形成されたガスケット溝内に2液混合熱硬化シリコンを充填してガスケットを前記ガスケット溝内に一体成形する成形法であって、前記樹脂部品のガスケット溝の開口側に該ガスケット溝より大径の係合溝を該ガスケット溝と同心状に形成し、前記樹脂部品に密着整合される密封型には、前記係合溝に密着係合し前記ガスケット溝より僅かに小径の成形空間を形成する圧縮率規制突起を突設し、該圧縮率規制突起を前記係合溝に密着係合させた状態で前記ガスケット溝及び成形空間内にシリコンを加圧充填し、シリコンの硬化するまで加圧力を維持することを特徴とする樹脂部品に対するガスケットの一体成形法。A gasket groove formed in a resin part is filled with a two-component mixed thermosetting silicone, and a gasket is integrally formed in the gasket groove. The gasket groove is formed on the opening side of the gasket groove of the resin part. A large-diameter engagement groove is formed concentrically with the gasket groove, and the sealing die tightly aligned with the resin component has a molding space that is closely engaged with the engagement groove and has a slightly smaller diameter than the gasket groove. Silicon is pressurized and filled into the gasket groove and the molding space in a state where the compression ratio regulating projection to be formed is projected and the compression ratio regulating projection is closely engaged with the engaging groove, and the silicon is cured until the silicon is hardened. A method for integrally forming a gasket on a resin part, wherein the pressure is maintained.
JP20745495A 1995-07-21 1995-07-21 Integral molding method of gasket for resin parts Expired - Fee Related JP3569858B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20745495A JP3569858B2 (en) 1995-07-21 1995-07-21 Integral molding method of gasket for resin parts

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20745495A JP3569858B2 (en) 1995-07-21 1995-07-21 Integral molding method of gasket for resin parts

Publications (2)

Publication Number Publication Date
JPH0932925A JPH0932925A (en) 1997-02-07
JP3569858B2 true JP3569858B2 (en) 2004-09-29

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4580631B2 (en) * 2003-10-15 2010-11-17 内山工業株式会社 Cylinder head gasket
JP2008232160A (en) * 2007-03-16 2008-10-02 Nok Corp Manufacturing method for base material integrated type seal structure
JP5126472B2 (en) * 2007-03-16 2013-01-23 Nok株式会社 Manufacturing method of resin separator integrated seal structure
WO2014018505A1 (en) * 2012-07-23 2014-01-30 Emerson Climate Technologies, Inc. Injection molded seals for compressors
DE102013101263B4 (en) * 2013-02-08 2022-12-01 Denso Corporation Sealing arrangement between two housing parts

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