JPS61269938A - Manufacture of piston - Google Patents
Manufacture of pistonInfo
- Publication number
- JPS61269938A JPS61269938A JP60111097A JP11109785A JPS61269938A JP S61269938 A JPS61269938 A JP S61269938A JP 60111097 A JP60111097 A JP 60111097A JP 11109785 A JP11109785 A JP 11109785A JP S61269938 A JPS61269938 A JP S61269938A
- Authority
- JP
- Japan
- Prior art keywords
- cylindrical body
- edge
- die
- opening edge
- bottomed cylindrical
- 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.)
- Granted
Links
Landscapes
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は油圧シリンダ等に使用される有底円筒形のピ
ストンの製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a bottomed cylindrical piston used in a hydraulic cylinder or the like.
［従来の技術］
有底円筒形のピストンは一般に鋳造による製造方法或い
は円柱形の素材がら冷間鍛造により製造する方法があっ
た。しかるに鋳造によるものはコストが高く、また円柱
形素材がら冷間鍛造を行う場合は塑性変形度が大きいの
で金型の消耗がはげしいのみならず途中で焼なまし工程
が必要でしがも素材に潤滑のためにボンデ処理（亜鉛メ
ッキ）を施さねばならないなど多くの加工工程を必要と
するのでこれもコストが高い欠点がある。[Prior Art] A bottomed cylindrical piston is generally manufactured by casting or by cold forging from a cylindrical material. However, the cost of casting is high, and when cold forging a cylindrical material, the degree of plastic deformation is large, so not only does the mold wear out rapidly, but an annealing process is required during the process, making it difficult to forge the material. This also has the drawback of high cost since it requires many processing steps such as bonding treatment (zinc plating) for lubrication.
一方、素材として適宜厚さの板材を使用しこれを深絞り
加工し有底円筒形に加工するピストンの製造方法も従来
がら何度が試みられていたが、その場合に問題になるの
は次の３点である。即ち、第１に通常の深絞りでは製品
の外周面と下面とが継がる角部の曲率半径が大きくて要
するに角張っては成形できないのでピストンの有効長が
短かくなることである。第２には平板から順々に深絞り
成形して来た過程があるため製品の周壁にショックライ
ンと呼ばれる極部的肉厚変化部分が生じることである。On the other hand, many attempts have been made to manufacture pistons by using plate material of an appropriate thickness and deep drawing it into a cylindrical shape with a bottom. There are three points. Firstly, in normal deep drawing, the radius of curvature of the corner where the outer circumferential surface and the lower surface of the product join is large and, in short, it cannot be formed into an angular shape, so the effective length of the piston is shortened. Second, due to the process of sequential deep drawing from a flat plate, a portion of extreme thickness change called a shock line occurs on the peripheral wall of the product.
さらに第３には深絞りのままでは製品の外周がテーパ状
であるのでストレートに切削加工しなければならずそう
すると開口側に向うに従い製品の肉厚が薄くなり強度上
の問題が生じることである。Thirdly, if the product is left deep drawn, the outer periphery of the product will be tapered, so it will have to be cut straight, and if this is done, the product will become thinner towards the opening side, causing strength problems. .
［発明の目的］
この発明は上記問題点を解消し金属板材からピストンを
低コストで製造できる方法を提供しようとするものであ
る。[Object of the Invention] The present invention aims to solve the above-mentioned problems and provide a method of manufacturing a piston from a metal plate material at low cost.
［目的を達成するための手段］
その目的を達成するためこの発明に係るピストンの製造
方法は、金属板材に絞り型による数回の絞り加工を施し
て有底筒体を成形する深絞り工程と、該有底円筒体の底
壁を上げ底状に膨出させた後、該有底円筒体を底面周縁
部が角張っていて内周面が開口部に向いテーパ状に拡開
した雌型中に装填して該有底円筒体の開口縁と前記上げ
底状膨出部とに同時に雄型を押し当てて圧縮するエツジ
成形程と、該エツジ成形工程の後で該有底円筒体をダイ
ス型に押し込んで外周をストレートに成形する外周加工
工程とよりなることを特徴とするものである。[Means for Achieving the Object] In order to achieve the object, the piston manufacturing method according to the present invention includes a deep drawing process in which a metal plate material is subjected to drawing several times using a drawing die to form a bottomed cylinder. After raising the bottom wall of the bottomed cylindrical body to bulge out to a bottom shape, the bottomed cylindrical body is placed in a female mold with an angular bottom peripheral edge and a tapered expanded inner peripheral surface facing the opening. An edge forming step in which the male die is simultaneously pressed against the opening edge of the bottomed cylindrical body and the raised bottom-shaped bulge portion to compress the body, and after the edge forming process, the bottomed cylindrical body is shaped into a die shape. This method is characterized by an outer periphery processing step in which the outer periphery is formed into a straight shape by pressing.
［作用］
有底円筒体の開口縁と上げ底状膨出部とを雌型中で雄型
により同時に圧縮することにより該有底円筒体に角張っ
たエツジ部を成形し、ショックライン（極部的肉厚変動
）を同時に解消させる。また、ダイス型に押し込み外周
をストレートに成形することで切削加工時のように開口
縁に向い肉厚が薄くなるのを訪ぐ。[Function] By simultaneously compressing the opening edge and the raised bottom-shaped bulge of the bottomed cylindrical body with a male mold in a female mold, an angular edge part is formed on the bottomed cylindrical body, and a shock line (extremely At the same time, the wall thickness fluctuations can be eliminated. Also, by pressing it into a die and forming the outer periphery straight, the wall thickness becomes thinner toward the edge of the opening, similar to when cutting.
［実施例］
以下にディスクブレーキ用油圧シリンダのピストンにつ
いて実施例を説明する。[Example] An example of a piston of a hydraulic cylinder for a disc brake will be described below.
先ず深絞り工程につき第１図に従い説明する。First, the deep drawing process will be explained with reference to FIG.
３〜１０ｍｍ厚の鋼板をトランスファープレス機等によ
り円板状に打ち抜いて第１図（Ａ）に示す金属板材１を
先ず形成する。この金属板材１を次第に型孔を深くした
絞り型にて順番にプレスして第１図（Ｂ）、（Ｃ）、（
Ｄ）の如く絞り率６０％〜 １８５％以内に
て次第に深絞りをして有底円筒体２を成形する。続いて
エツジ成形工程について第２図に従い説明する。この有
底円筒体２の底壁を第２図（Ａ）に示したように上げ底
状に内方へ膨出させ上げ底状膨出部３を形成する。次い
で第２図ＣＢ）に示したように底面周縁部４が角張って
いて内周面５が開口部６に向いテーパ状に拡開した雌形
７中にこの有底円筒体２を装填し該有底円筒体２の開口
縁８と前記上げ底状膨出部３とに雄型９の周縁段部１０
とポンチ１１の先端面１２を夫々押し当てて圧縮する。First, a metal plate 1 shown in FIG. 1(A) is formed by punching out a steel plate with a thickness of 3 to 10 mm into a disk shape using a transfer press or the like. This metal plate material 1 is pressed in order using a drawing die with progressively deeper holes as shown in Figs. 1 (B), (C), (
As shown in D), the bottomed cylindrical body 2 is formed by deep drawing gradually at a drawing rate of 60% to 185%. Next, the edge forming process will be explained with reference to FIG. The bottom wall of this bottomed cylindrical body 2 is bulged inward in a raised bottom shape to form a raised bottom shaped bulged portion 3, as shown in FIG. 2(A). Next, as shown in FIG. 2 CB), this bottomed cylindrical body 2 is loaded into a female mold 7 whose bottom peripheral edge 4 is angular and whose inner circumferential surface 5 is tapered toward the opening 6. A peripheral step portion 10 of the male mold 9 is provided on the opening edge 8 of the bottomed cylindrical body 2 and the raised bottom-like bulge portion 3.
and the tip end surface 12 of the punch 11 are pressed against each other to compress.
この圧縮によって有底円筒体２の外周面と下面とが継が
る角部を曲率半径２ｍｍ程度までに角張らせてエツジ部
１３を形成せしめる。By this compression, the corner portion where the outer peripheral surface and the lower surface of the bottomed cylindrical body 2 are joined is squared to a radius of curvature of about 2 mm to form an edge portion 13.
ポンチ１１の外周面は雌型７の内周面５のテーパよりも
なだらかで殆んどストレートに近い抜き勾配程度に形成
されている。このため有底円筒体２の周壁１４はこの雌
型７の内周面５とポンチ１１の外周面とによって挟圧さ
れ該周壁１４の肉厚の極部的変動が矯正され、所謂ショ
ックラインが解消されると同時に、該周壁１４の肉厚は
開口縁８に向うに従い厚いテーパ状になる。次いでこの
第２図（Ｃ）に示す有底円筒体２の外周加工工程を第３
図に従い説明する。この工程は、有底円筒体２をその間
口縁８側からダイス型１５中に押し込むもので、１６は
その押し込み用の抑圧部材を示す。この加工工程によっ
て有底円筒体は外周面がしごかれて、開口縁８の内径が
つぼまるように変形し同時に周壁１４の外周面はストレ
ートに成形される。なお必要に応じこの外周加工工程を
２工程以上で行ない内径が少し宛小径のダイス型に順に
押し込むことにより有底円筒体２の外周面を高精度に鏡
面仕上することができる。The outer circumferential surface of the punch 11 is formed to have a draft angle that is gentler than the taper of the inner circumferential surface 5 of the female die 7 and is almost straight. Therefore, the circumferential wall 14 of the bottomed cylindrical body 2 is compressed by the inner circumferential surface 5 of the female die 7 and the outer circumferential surface of the punch 11, and local variations in the wall thickness of the circumferential wall 14 are corrected, so that a so-called shock line is formed. At the same time, the thickness of the peripheral wall 14 becomes thicker and tapered toward the opening edge 8. Next, the outer periphery machining process of the bottomed cylindrical body 2 shown in FIG. 2(C) is carried out in the third step.
This will be explained according to the diagram. In this step, the bottomed cylindrical body 2 is pushed into the die 15 from the mouth edge 8 side, and 16 indicates a suppressing member for pushing. Through this processing step, the outer peripheral surface of the bottomed cylindrical body is squeezed and deformed so that the inner diameter of the opening edge 8 is narrowed, and at the same time, the outer peripheral surface of the peripheral wall 14 is formed into a straight shape. If necessary, the outer circumferential surface of the bottomed cylindrical body 2 can be mirror-finished with high precision by performing this outer circumferential processing step in two or more steps and sequentially pushing the outer circumference into a die mold having a slightly smaller inner diameter.
このようにして製造されたピストンは第４図に示したよ
うに外周面はストレートで内径は開口縁８に向いつぼま
る形態となり１周壁１４の肉厚は開口縁８に向い若干厚
くなるか或いは略々均一になる。またエツジ部■３が角
ぼっているので全長に対する有効長りの比率が高い。As shown in FIG. 4, the piston manufactured in this manner has a straight outer circumferential surface and a tapered inner diameter facing the opening edge 8, and the thickness of the first circumferential wall 14 becomes slightly thicker toward the opening edge 8. It becomes almost uniform. Furthermore, since the edge portion (3) is rounded, the ratio of effective length to total length is high.
［発明の効果］
（１）金属板材から成形され塑性変形度が比較的少ない
。このため塑性変形度が大きい場合に必要な焼なまし、
ボンデ処理等を要さず、金型の摩耗も少ない。[Effects of the Invention] (1) Molded from a metal plate material and has a relatively low degree of plastic deformation. Therefore, when the degree of plastic deformation is large, annealing is necessary.
There is no need for bonding treatment, and there is little wear on the mold.
（２）外周面と下面との角部が角張って成形できるため
にピストンとしての有効長が長い。(2) The effective length of the piston is long because the corners between the outer peripheral surface and the lower surface can be formed into angular shapes.
（３）外周面が高精度に仕上できる。(3) The outer peripheral surface can be finished with high precision.
（４）開口縁の肉厚が充分に確保できるので該開口縁に
機械加工を施しても強度不足を生じることがない。(4) Since the opening edge can be sufficiently thick, there will be no lack of strength even if the opening edge is machined.
（５）少ない加工工程で製造できるので製造コストがか
からず量産に適する。(5) Since it can be manufactured with fewer processing steps, the manufacturing cost is low and it is suitable for mass production.
図面は本発明の一実施例を示したもので、第１図（Ａ）
、（Ｂ）、（Ｃ）、（Ｄ）は深絞り工程における素材の
変形を順に示した縦断面図、第２図（Ａ）、（Ｂ）、（
Ｃ）はエツジ成形工程における素材の変形を示した縦断
面図、第３図は外周加工工程の縦断面図、第４図は製品
の縦断面図である。
■・・・・金属板材、２・・・・有底円筒体、３・・・
・上げ底状膨出部、４・・・・底面周縁部、５・・・・
内周面。
６・・・・開口部、７・・・・雌型、８・・・・開口縁
、９・・・・雄型、１０・・・・周縁段部、１１・・・
・ポンチ、１２・・・・先端面、１３・・・・エツジ部
、１４・・・・周壁、１５・・・・ダイス型、１６・・
・・押圧部材。
特許出願人 久野金属工業株式会社ｌｉ じ・°
ノ）The drawings show one embodiment of the present invention, and FIG.
, (B), (C), and (D) are vertical cross-sectional views sequentially showing the deformation of the material in the deep drawing process.
C) is a vertical cross-sectional view showing the deformation of the material in the edge forming process, FIG. 3 is a vertical cross-sectional view of the outer periphery processing process, and FIG. 4 is a vertical cross-sectional view of the product. ■・・・Metal plate material, 2...Cylinder with bottom, 3...
- Raised bottom-shaped bulge, 4...bottom peripheral edge, 5...
Inner peripheral surface. 6... Opening, 7... Female mold, 8... Opening edge, 9... Male mold, 10... Peripheral step, 11...
・Punch, 12...Tip surface, 13...Edge part, 14...Peripheral wall, 15...Dice shape, 16...
...Press member. Patent applicant: Kuno Metal Industry Co., Ltd.
of)
Claims (1)
体を成形する深絞り工程と、該有底円筒体の底壁を上げ
底状に膨出させた後、該有底円筒体を底面周縁部が角張
つていて内周面が開口部に向いテーパ状に拡開した雌型
中に装填して該有底円筒体の開口縁と前記上げ底状膨出
部とに同時に雄型を押し当てて圧縮するエッジ成形程と
、該エッジ成形工程の後で該有底円筒体をダイス型に押
し込んで外周をストレートに成形する外周加工工程とよ
りなるピストンの製造方法。A deep drawing process in which a metal plate material is drawn several times with a drawing die to form a cylinder with a bottom, and the bottom wall of the cylinder with a bottom is raised to bulge out into a bottom shape, and then the cylinder with a bottom is The male mold is loaded into a female mold whose bottom peripheral edge is angular and whose inner peripheral surface faces the opening and expands in a tapered shape, and the male mold is simultaneously applied to the opening edge of the bottomed cylinder and the raised bottom-like bulge. A method for manufacturing a piston, which comprises an edge forming step of pressing and compressing, and an outer periphery processing step of pushing the bottomed cylindrical body into a die mold to form a straight outer periphery after the edge forming step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60111097A JPS61269938A (en) | 1985-05-23 | 1985-05-23 | Manufacture of piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60111097A JPS61269938A (en) | 1985-05-23 | 1985-05-23 | Manufacture of piston |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2162517A Division JPH03151123A (en) | 1990-06-20 | 1990-06-20 | Manufacture of piston |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61269938A true JPS61269938A (en) | 1986-11-29 |
| JPH0144407B2 JPH0144407B2 (en) | 1989-09-27 |
Family
ID=14552309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60111097A Granted JPS61269938A (en) | 1985-05-23 | 1985-05-23 | Manufacture of piston |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61269938A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63248520A (en) * | 1987-03-31 | 1988-10-14 | Aida Eng Ltd | Method for forming outer diameter corner part in cup-like body |
| WO1989007496A1 (en) * | 1988-02-09 | 1989-08-24 | Vatsvog Marlo K | Composite cartridge for high velocity rifles and the like |
| JPH03151123A (en) * | 1990-06-20 | 1991-06-27 | Kuno Kinzoku Kogyo Kk | Manufacture of piston |
| US5174192A (en) * | 1990-10-17 | 1992-12-29 | Jebron Limited | Piston, method of making the piston and piston and cylinder unit comprising the piston |
| WO2003015980A1 (en) * | 2001-08-08 | 2003-02-27 | Lucas Automotive Gmbh | Hydraulic piston consisting of rolled sheet metal, method for producing the same and an intermediate product obtained by said method |
| DE102005061354A1 (en) * | 2005-12-21 | 2007-06-28 | Continental Teves Ag & Co. Ohg | Piston for a hydraulic brake and method of manufacture |
| KR101295252B1 (en) * | 2013-01-10 | 2013-08-12 | 세일메탈주식회사 | Mold-induced edge molding device mold-induced edge molding device |
| WO2014109245A1 (en) * | 2013-01-09 | 2014-07-17 | 新日鐵住金株式会社 | Press-forming method |
| JP2015033708A (en) * | 2013-08-08 | 2015-02-19 | トーヨーエイテック株式会社 | Press-molding metal mold, press-molding method and press-molding device |
-
1985
- 1985-05-23 JP JP60111097A patent/JPS61269938A/en active Granted
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63248520A (en) * | 1987-03-31 | 1988-10-14 | Aida Eng Ltd | Method for forming outer diameter corner part in cup-like body |
| WO1989007496A1 (en) * | 1988-02-09 | 1989-08-24 | Vatsvog Marlo K | Composite cartridge for high velocity rifles and the like |
| JPH03151123A (en) * | 1990-06-20 | 1991-06-27 | Kuno Kinzoku Kogyo Kk | Manufacture of piston |
| US5174192A (en) * | 1990-10-17 | 1992-12-29 | Jebron Limited | Piston, method of making the piston and piston and cylinder unit comprising the piston |
| CN100368142C (en) * | 2001-08-08 | 2008-02-13 | 卢卡斯汽车股份有限公司 | Hydraulic piston consisting of rolled sheet metal, method for producing the same and an intermediate product obtained by said method |
| WO2003015980A1 (en) * | 2001-08-08 | 2003-02-27 | Lucas Automotive Gmbh | Hydraulic piston consisting of rolled sheet metal, method for producing the same and an intermediate product obtained by said method |
| US7000526B2 (en) | 2001-08-08 | 2006-02-21 | Lucas Automotive Gmbh | Hydraulic piston made from rolled sheet metal, method for its manufacture and intermediate product of the method |
| DE102005061354A1 (en) * | 2005-12-21 | 2007-06-28 | Continental Teves Ag & Co. Ohg | Piston for a hydraulic brake and method of manufacture |
| WO2014109245A1 (en) * | 2013-01-09 | 2014-07-17 | 新日鐵住金株式会社 | Press-forming method |
| JP5655994B2 (en) * | 2013-01-09 | 2015-01-21 | 新日鐵住金株式会社 | Press forming method |
| CN104918726A (en) * | 2013-01-09 | 2015-09-16 | 新日铁住金株式会社 | Press-forming method |
| US9452461B2 (en) | 2013-01-09 | 2016-09-27 | Nippon Steel & Sumitomo Metal Corporation | Press forming method |
| KR101295252B1 (en) * | 2013-01-10 | 2013-08-12 | 세일메탈주식회사 | Mold-induced edge molding device mold-induced edge molding device |
| JP2015033708A (en) * | 2013-08-08 | 2015-02-19 | トーヨーエイテック株式会社 | Press-molding metal mold, press-molding method and press-molding device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0144407B2 (en) | 1989-09-27 |
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