JP2001165318A - Manufacturing process of gasket shim - Google Patents
Manufacturing process of gasket shimInfo
- Publication number
- JP2001165318A JP2001165318A JP34639599A JP34639599A JP2001165318A JP 2001165318 A JP2001165318 A JP 2001165318A JP 34639599 A JP34639599 A JP 34639599A JP 34639599 A JP34639599 A JP 34639599A JP 2001165318 A JP2001165318 A JP 2001165318A
- Authority
- JP
- Japan
- Prior art keywords
- shim
- gasket
- hole
- heated
- main body
- 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.)
- Withdrawn
Links
Landscapes
- Gasket Seals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、自動車用エンジン
のシリンダヘッドガスケットやエキゾーストマニホール
ドガスケットなどに用いられるガスケットに関し、より
詳しくは、ガスケットのシム部の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasket used for a cylinder head gasket and an exhaust manifold gasket of an automobile engine, and more particularly to a method of manufacturing a shim portion of a gasket.
【０００２】[0002]
【従来の技術】従来、この種のガスケットとして、板状
のガスケット本体にシールすべき高圧部分となる貫通孔
を穿設するとともに、該ガスケット本体に上記貫通孔を
囲むシムリングをスポット溶接やレーザ溶接等の適宜の
手段を用いて溶接したものが知られている（特開昭６２
−２７８３７５号公報、実開平３−７３６４３号公
報）。2. Description of the Related Art Conventionally, as a gasket of this type, a plate-like gasket body is provided with a through hole serving as a high-pressure portion to be sealed, and a shim ring surrounding the through hole is spot-welded or laser-welded to the gasket body. What is welded using appropriate means such as
-278375, Japanese Utility Model Laid-Open No. 3-73643).
【０００３】[0003]
【発明が解決しようとする課題】上記シムリングは貫通
孔を囲むリング状に製造する必要があるが、従来はガス
ケット本体を製造する板状素材とは別の板状素材からシ
ムリングを打抜いて製造しており、しかも材料歩留まり
がきわめて悪いため、ガスケットのコストダウンを阻害
する要因となっていた。このような問題を解決するため
に、板状のガスケット本体にシールすべき高圧部分とな
る貫通孔を穿設するとともに、該貫通孔の周縁部分を半
径方向外方に湾曲させるとともにガスケット本体に重合
させて上記シムリングに相当するシム部を形成したもの
が提案されている（特開平５−５２２６７号公報）。し
かしながら、上記貫通孔の周縁部分を半径方向外方に湾
曲させてシム部としているが、その湾曲部分で割れやク
ラックが発生する危険性があり、特にＳＵＳ板は硬いた
めに湾曲部分で割れやクラックが発生する危険性が高か
った。本発明はそのような事情に鑑み、シム部の湾曲部
分の割れやクラックを防止することができるガスケット
のシム部の製造方法を提供するものであるThe above-mentioned shim ring must be manufactured in a ring shape surrounding the through hole, but conventionally, the shim ring is manufactured by punching a shim ring from a plate material different from the plate material for manufacturing the gasket body. In addition, the material yield is extremely poor, which has been a factor that hinders cost reduction of gaskets. In order to solve such a problem, a plate-shaped gasket body is provided with a through-hole serving as a high-pressure portion to be sealed, and a peripheral portion of the through-hole is bent radially outward and overlapped with the gasket body. A structure in which a shim portion corresponding to the above-mentioned shim ring is formed has been proposed (JP-A-5-52267). However, although the peripheral portion of the through hole is bent outward in the radial direction to form a shim portion, there is a risk that cracks and cracks may occur at the curved portion. The risk of cracks was high. The present invention has been made in view of such circumstances, and provides a method of manufacturing a shim portion of a gasket that can prevent cracks and cracks in a curved portion of the shim portion.
【０００４】[0004]
【課題を解決するための手段】すなわち本発明の製造方
法は、ガスケット本体にシールすべき高圧部分となる貫
通孔をシリンダボアの内径よりも小さな径で穿設し、該
貫通孔の周囲を加熱して該加熱部分を半径方向外方に湾
曲させるとともにガスケット本体に重合させてシム部を
形成するようにしたものである。That is, according to the manufacturing method of the present invention, a through hole as a high pressure portion to be sealed in a gasket main body is formed with a diameter smaller than the inner diameter of a cylinder bore, and the periphery of the through hole is heated. The heating portion is bent outward in the radial direction and is superposed on the gasket main body to form a shim portion.
【０００５】上記製造方法によれば、上記貫通孔の周囲
をシム部形成前に加熱しているので、該加熱部分を湾曲
させてシム部を形成する際に、その湾曲部分に割れやク
ラックが発生するのを防止できる。そして、しかもシム
部を形成する範囲で貫通孔の周囲を加熱すればよいの
で、ガスケット本体全体を加熱した場合のように、ガス
ケット本体全体が焼鈍されてガスケットとして必要なバ
ネ性が失われることがない。According to the manufacturing method, since the periphery of the through hole is heated before forming the shim, when the heated portion is bent to form the shim, cracks and cracks are formed in the curved portion. It can be prevented from occurring. In addition, since the periphery of the through hole only needs to be heated in the range where the shim is formed, the entire gasket main body is annealed as in the case where the entire gasket main body is heated, and the spring property required for the gasket may be lost. Absent.
【０００６】[0006]
【発明の実施の形態】以下図示実施例について本発明を
説明すると、図１において、ＳＵＳ３０１からなり、
０．２５ｍｍの板厚、Ｈｖ４５０の硬さを有するガスケ
ット本体１に、図示しないシリンダボアの内径よりも小
さな径で燃焼室の一部となる貫通孔２をプレス抜きまた
はワイヤカット等により成形する。上記貫通孔２の直径
Ｄ0は重合させる幅を考慮して設定しており、本実施例
では８４．５ｍｍとした。次に、図示しないＹＡＧレー
ザ加工機により、上記貫通孔２の周囲に連続発振でレー
ザビームを照射して加熱し、その加熱部分（周縁部分）
１´を焼鈍する。この照射範囲は、直径Ｄ１＝８９．５
ｍｍの範囲とした。つまり、貫通孔２の周囲を２．５ｍ
ｍの幅で照射している。そして焼鈍後では、加熱部分１
´は焼鈍前のＨｖ４５０の硬さからＨｖ２２０〜３００
の硬さへと低下していた。次に、折曲げ加工としてプレ
ス機械３により硬度の低下した加熱部分１´を９０度に
折曲げることにより円筒状に成形して円筒状部分４を形
成し、さらに、拡開工程としてプレス機械５により硬度
の低い該円筒状部分４をガスケット本体１側とは反対側
の先端部側が拡開するように、１２０度に折曲げてテー
パ状部分６を形成するようになっている。ここまでの折
曲げ工程および拡開工程では、円筒状部分４の湾曲部分
４´およびテーパ状部分６の湾曲部分６´共に割れやク
ラックの発生は認められず、該湾曲部分４´、６´共に
滑らかに折曲がっている。そしてさらに、予備プレス工
程としてプレス機械７により該テーパ状部分６をガスケ
ット本体１に２トンの荷重で重合させてシム部８を予備
形成し、最後にプレス工程としてプレス機械９により該
シム部８に１３０トンの荷重を加えて、シム部１０を製
造する。以上の予備プレス工程およびプレス工程が終了
しても、シム部８の湾曲部分８´並びにシム部１０の湾
曲部分１０´共に割れやクラックの発生は認められず、
やはり該湾曲部分８´、１０´共に滑らかに折曲がって
いる。そして形成後には、シム部１０は０．３７〜０．
４４の板厚、Ｈｖ４２１〜４６８の硬さを有しており、
すなわちシム部１０とガスケットの段差がガスケット本
体１の板厚０．２５ｍｍよりも小さくなるととともに、
硬さは加工硬化によってガスケット本体１と略同じ硬さ
となっている。さらに上記シム部１０とガスケット本体
１とは相互に接着されているわけではないので、それが
機能上問題となるような場合には、上記シム部１０の外
周面全域をガスケット本体１に溶接１１してもよいし、
シム部１０を焼入れするようにしてもよい。このように
して製造した貫通孔２（燃焼室孔）の内径Ｄ２は８６．
７ｍｍであり、また上記シム部８の外径Ｄ３は９０．５
ｍｍであった。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiment.
In a gasket main body 1 having a plate thickness of 0.25 mm and a hardness of Hv450, a through hole 2 having a diameter smaller than the inner diameter of a not-shown cylinder bore and serving as a part of a combustion chamber is formed by press punching or wire cutting. The diameter D 0 of the through hole 2 is set in consideration of the width to be superimposed, and is 84.5 mm in this embodiment. Next, the periphery of the through hole 2 is irradiated with a laser beam by continuous oscillation and heated by a YAG laser processing machine (not shown), and the heated portion (peripheral portion)
Anneal 1 '. This irradiation range has a diameter D 1 = 89.5.
mm. That is, the circumference of the through hole 2 is 2.5 m
m width. And after annealing, heating part 1
′ Is Hv220 to 300 from the hardness of Hv450 before annealing.
Had decreased to the hardness. Next, as a bending process, the heated portion 1 ′ whose hardness has been reduced by the press machine 3 is formed into a cylindrical shape by bending the heated portion 1 ′ at 90 degrees to form a cylindrical portion 4. The cylindrical portion 4 having a lower hardness is bent at 120 degrees to form a tapered portion 6 such that the tip end side opposite to the gasket main body 1 side expands. In the bending step and the expanding step so far, cracks and cracks are not generated in both the curved portion 4 'of the cylindrical portion 4 and the curved portion 6' of the tapered portion 6, and the curved portions 4 ', 6' Both are bent smoothly. Further, as a preliminary pressing step, the tapered portion 6 is superimposed on the gasket main body 1 with a load of 2 tons by the press machine 7 to preliminarily form the shim portion 8, and finally, the shim portion 8 is formed by the press machine 9 as the press step. The shim part 10 is manufactured by applying a load of 130 tons. Even after the above pre-pressing step and pressing step are completed, no cracks or cracks are observed in the curved portion 8 'of the shim 8 and the curved portion 10' of the shim 10.
Again, both the curved portions 8 'and 10' are smoothly bent. After the formation, the shim portion 10 has a thickness of 0.37-0.
It has a plate thickness of 44 and a hardness of Hv 421 to 468,
That is, the step between the shim portion 10 and the gasket becomes smaller than the plate thickness 0.25 mm of the gasket main body 1, and
The hardness is substantially the same as that of the gasket main body 1 due to work hardening. Further, since the shim portion 10 and the gasket main body 1 are not bonded to each other, if it becomes a problem in function, the entire outer peripheral surface of the shim portion 10 is welded to the gasket main body 1 by the welding 11. May be
The shim 10 may be hardened. The inner diameter D 2 of the thus through holes 2 was prepared (the combustion chamber holes) 86.
It is 7 mm, also the outer diameter D 3 of the shim portion 8 90.5
mm.
【０００７】なお、貫通孔２の周囲を加熱する手段とし
てはレーザに限定されるものではなく、例えば高周波加
熱であってもよい。このような高周波加熱手段として
は、電流を通電させた導電性金属（例えば銅）を貫通孔
２内に挿入させて該貫通孔２の周囲を加熱させればよ
く、より好ましくは導電性金属を中空としてその内部に
冷却液を流通させればよく、また貫通孔２内に挿入され
る挿入部については該貫通孔２に合わせて環状に形成す
るのが好ましく、この場合には環状部は貫通孔２よりも
小径に設定すればよい。The means for heating the periphery of the through hole 2 is not limited to a laser, but may be, for example, high frequency heating. As such a high-frequency heating means, a conductive metal (for example, copper) to which a current has been applied may be inserted into the through-hole 2 to heat the periphery of the through-hole 2, and more preferably the conductive metal may be used. The coolant may be hollow and the coolant may be circulated therein, and the insertion portion inserted into the through hole 2 is preferably formed in an annular shape in accordance with the through hole 2. In this case, the annular portion has a through hole. The diameter may be set smaller than that of the hole 2.
【０００８】また、拡開工程と予備プレス工程とは必ず
しも必要ではなく、場合によっては省略してもよい。Further, the expanding step and the preliminary pressing step are not always necessary, and may be omitted in some cases.
【０００９】[0009]
【発明の効果】以上のように、本発明の製造方法によれ
ば、貫通孔の周囲をシム部形成前に加熱して該加熱部分
を湾曲させるとともにガスケット本体に重合させるよう
にしているので、その湾曲部分に割れやクラックが発生
するのを防止することができ、しかもシム部を形成する
範囲で貫通孔の周囲を加熱しているので、ガスケット本
体全体を加熱した場合のように、ガスケット本体全体が
焼鈍されてガスケットとして必要なバネ性が失われるこ
とがないという効果も得られる。As described above, according to the manufacturing method of the present invention, the periphery of the through hole is heated before the formation of the shim so that the heated portion is curved and overlapped with the gasket main body. Since the cracks and cracks can be prevented from being generated in the curved portion, and the periphery of the through hole is heated within a range where the shim is formed, the gasket main body is heated as in the case where the entire gasket main body is heated. There is also obtained an effect that the whole is not annealed and the spring property required for the gasket is not lost.
【図１】本発明の製造工程を示す工程図。FIG. 1 is a process chart showing a manufacturing process of the present invention.
１…ガスケット本体 １´…加熱部分（周縁部分） ２…貫通孔 ８、１０…シム部 ８´、１０´…湾曲部分 DESCRIPTION OF SYMBOLS 1 ... Gasket main body 1 '... Heating part (peripheral part) 2 ... Through-hole 8, 10 ... Shim part 8', 10 '... Curved part
Claims (6)
となる貫通孔をシリンダボアの内径よりも小さな径で穿
設し、該貫通孔の周囲を加熱して該加熱部分を半径方向
外方に湾曲させるとともにガスケット本体に重合させて
シム部を形成することを特徴とするガスケットのシム部
の製造方法。1. A through hole as a high-pressure portion to be sealed in a gasket main body is formed with a diameter smaller than the inner diameter of a cylinder bore, and the periphery of the through hole is heated to bend the heated portion radially outward. A method of manufacturing a shim portion of a gasket, wherein the shim portion is formed by superimposing the shim portion on the gasket body.
部分を円筒状に成形し、しかる後、該円筒状部分をガス
ケット本体側と反対側の先端部側が拡開したテーパ状に
成形し、さらに該テーパ状部分をガスケット本体に重合
させて上記シム部を形成することを特徴とする請求項１
に記載のガスケットのシム部の製造方法。2. After heating the periphery of the through hole, the heated portion is formed into a cylindrical shape, and thereafter, the cylindrical portion is formed into a tapered shape in which the tip end side opposite to the gasket main body side is expanded. The shim portion is formed by superimposing the tapered portion on the gasket main body.
3. The method for manufacturing a shim portion of a gasket according to 1.
周面をガスケット本体に溶接することを特徴とする請求
項１又は請求項２に記載のガスケットのシム部の製造方
法。3. The method according to claim 1, wherein after forming the shim, the outer peripheral surface of the shim is welded to the gasket body.
ることを特徴とする請求項１ないし請求項３のいずれか
に記載のガスケットのシム部の製造方法。4. A method for manufacturing a shim portion of a gasket according to claim 1, wherein the periphery of said through hole is heated by a laser.
熱することを特徴とする請求項１ないし請求項３のいず
れかに記載のガスケットのシム部の製造方法。5. The method for manufacturing a shim portion of a gasket according to claim 1, wherein the periphery of the through hole is heated by high-frequency heating.
なることを特徴とする請求項１ないし請求項５のいずれ
かに記載のガスケットのシム部の製造方法。6. The method according to claim 1, wherein the gasket main body is made of stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34639599A JP2001165318A (en) | 1999-12-06 | 1999-12-06 | Manufacturing process of gasket shim |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34639599A JP2001165318A (en) | 1999-12-06 | 1999-12-06 | Manufacturing process of gasket shim |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001165318A true JP2001165318A (en) | 2001-06-22 |
Family
ID=18383144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34639599A Withdrawn JP2001165318A (en) | 1999-12-06 | 1999-12-06 | Manufacturing process of gasket shim |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001165318A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007253910A (en) * | 2006-03-27 | 2007-10-04 | Denso Corp | Heat exchanger for motorcycle and manufacturing method thereof |
| EP2858185A4 (en) * | 2012-05-28 | 2016-03-16 | Ngk Spark Plug Co | Gasket and production method for same, and spark plug and production method for same |
| CN111889965A (en) * | 2020-07-03 | 2020-11-06 | 无锡市亿高精密模塑技术有限公司 | Adjusting gasket machining process and method |
| CN114012411A (en) * | 2021-09-29 | 2022-02-08 | 山西江淮重工有限责任公司 | Flanging device |
-
1999
- 1999-12-06 JP JP34639599A patent/JP2001165318A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007253910A (en) * | 2006-03-27 | 2007-10-04 | Denso Corp | Heat exchanger for motorcycle and manufacturing method thereof |
| JP4582035B2 (en) * | 2006-03-27 | 2010-11-17 | 株式会社デンソー | Motorcycle heat exchanger and method of manufacturing the same |
| EP2858185A4 (en) * | 2012-05-28 | 2016-03-16 | Ngk Spark Plug Co | Gasket and production method for same, and spark plug and production method for same |
| CN111889965A (en) * | 2020-07-03 | 2020-11-06 | 无锡市亿高精密模塑技术有限公司 | Adjusting gasket machining process and method |
| CN114012411A (en) * | 2021-09-29 | 2022-02-08 | 山西江淮重工有限责任公司 | Flanging device |
| CN114012411B (en) * | 2021-09-29 | 2023-10-27 | 山西江淮重工有限责任公司 | Flanging device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20070206 |