JPH03110040A - Production of rocker arm body - Google Patents
Production of rocker arm bodyInfo
- Publication number
- JPH03110040A JPH03110040A JP25015689A JP25015689A JPH03110040A JP H03110040 A JPH03110040 A JP H03110040A JP 25015689 A JP25015689 A JP 25015689A JP 25015689 A JP25015689 A JP 25015689A JP H03110040 A JPH03110040 A JP H03110040A
- Authority
- JP
- Japan
- Prior art keywords
- mounting hole
- roller mounting
- rocker arm
- pawls
- correction
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 31
- 239000013067 intermediate product Substances 0.000 claims abstract description 21
- 210000000078 claw Anatomy 0.000 claims description 35
- 238000000034 method Methods 0.000 claims description 24
- 238000012937 correction Methods 0.000 abstract description 30
- 238000003825 pressing Methods 0.000 abstract description 7
- 238000011282 treatment Methods 0.000 abstract 2
- 230000002411 adverse Effects 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000002184 metal Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 230000003746 surface roughness Effects 0.000 description 5
- 238000005495 investment casting Methods 0.000 description 4
- 238000005245 sintering Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/20—Making machine elements valve parts
- B21K1/205—Making machine elements valve parts rocker arms
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Forging (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
本発明は、エンジンの一部品であるロッカアームの本体
部分の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a main body portion of a rocker arm, which is a component of an engine.
「従来技術と発明が解決しようとする課題」ロッカアー
ムは、エンジンのカムとバルブとの間に設けられた部品
で、カムの形状に応じたタイミングでバルブを開閉する
ものである。"Prior Art and Problems to be Solved by the Invention" A rocker arm is a component installed between an engine cam and a valve, and opens and closes the valve at a timing that corresponds to the shape of the cam.
このロッカアームの一種に、第３図および第４図に示す
ものがある。このロッカアームは、ローラ方式のもので
、かつ２つのバルブを同時に開閉できるタイプのもので
ある。このロッカアームは、ロッカアーム本体２とロー
ラ４とで構成されている。ロッカアーム本体２の中心線
Ａを挟む両側には、バルブに当接する爪ｌ、■が形成さ
れている。One type of rocker arm is shown in FIGS. 3 and 4. This rocker arm is of a roller type and can open and close two valves at the same time. This rocker arm is composed of a rocker arm body 2 and a roller 4. On both sides of the center line A of the rocker arm main body 2, claws l and (2) are formed to abut the valve.
また中心線Ａ上には、カムに当接するローラ４が収容さ
れるローラ取付穴３が形成されている。Further, on the center line A, a roller mounting hole 3 is formed in which a roller 4 that contacts the cam is accommodated.
従来この種のロッカアームの本体２は、寸法精度の良い
焼結法で製造されていた。ところが焼結法は生産効率が
劣るので、ロッカアームの生産コストを十分低減できな
い不満があった。Conventionally, the main body 2 of this type of rocker arm has been manufactured by a sintering method with good dimensional accuracy. However, since the sintering method has poor production efficiency, there has been a dissatisfaction that the production cost of the rocker arm cannot be sufficiently reduced.
そこで精密鋳造法、型鍛造法等の生産効率の良い方法で
ロッカアーム本体２を製造することが提案されている。Therefore, it has been proposed to manufacture the rocker arm body 2 using a highly productive method such as precision casting or die forging.
ところが精密鋳造法等は焼結法に比較して寸法精度が良
くないので、これらの方法でロッカアーム本体２を製造
する場合は、■爪１゜１間の間隔のバラツキを所定の範
囲に収めることができない、■ローラ取付穴３の内側面
３ａ、３ａ間の距離の精度を出せない、■および内側面
３ａ。However, precision casting methods do not have good dimensional accuracy compared to sintering methods, so when manufacturing the rocker arm body 2 using these methods, it is necessary to keep the variation in the spacing between the claws 1°1 within a predetermined range. ■The distance between the inner surfaces 3a and 3a of the roller mounting hole 3 cannot be determined accurately.■And the inner surface 3a.
３ａを平滑に形成できないという３つの問題があった。There were three problems: 3a could not be formed smoothly.
これらの問題に対処するために本発明者らは鋭意研究を
重ね、先に特願昭６２−２４８７５９号にて、面記■■
の問題を解決できる方法としてロッカアームの製造方法
を提案した。In order to deal with these problems, the inventors of the present invention have conducted extensive research, and previously published a paper in Japanese Patent Application No. 62-248759.
We proposed a method for manufacturing rocker arms as a way to solve this problem.
この製造方法は、概略、ロッカアーム本体２のローラ取
付穴３に、平滑に仕上げられた矯正ブロックを若干の間
隙を以て挿入して、ローラ取付穴３の内側面３ａ、３ａ
と対向するロッカアーム本体２の外側面２ ａ、 ２
ａを押圧する方法である。この方法によれば、ローラ取
付穴３の内側面３ａ、３ａが塑性変形して面粗さが改善
されると共に、内側面３ａ、３ａ間の距離のバラツキが
改善される。This manufacturing method basically involves inserting a smoothed straightening block into the roller mounting hole 3 of the rocker arm main body 2 with a slight gap between the inner surfaces 3a and 3a of the roller mounting hole 3.
The outer surface 2a, 2 of the rocker arm body 2 facing the
This is a method of pressing a. According to this method, the inner surfaces 3a, 3a of the roller mounting hole 3 are plastically deformed, and the surface roughness is improved, and the variation in the distance between the inner surfaces 3a, 3a is also improved.
このようにしてローラ取付穴３の部分に関係する問題は
解決できる、爪１．１間の間隔のバラツキを所定の範囲
内に収めるための処理法で効率の良い方法が完成されて
おらず、その開発が要望されていた。In this way, the problem related to the roller mounting hole 3 can be solved, but an efficient method for keeping the variation in the spacing between the claws 1.1 within a predetermined range has not yet been completed. Its development was requested.
本発明は前記事情に鑑みてなされたもので、爪１．１間
の間隔のバラツキを所定の範囲内に収めることができ、
しかも生産効率の良いロッカアーム本体の製造方法を提
供することを目的とする。The present invention has been made in view of the above circumstances, and it is possible to keep the variation in the spacing between the claws 1.1 within a predetermined range,
Moreover, it is an object of the present invention to provide a method for manufacturing a rocker arm body with high production efficiency.
「課題を解決するための手段」
本発明のロッカアーム本体の製造方法では、中間製品の
ローラ取付穴に矯正ブロックを挿入して中間製品のロー
ラ取付穴の部分を外側から押圧しローラ取付穴の内側面
を平滑に仕上げると同時に、爪の部分を押圧して爪間距
離を矯正することを課題解決の手段とした。"Means for Solving the Problems" In the method for manufacturing a rocker arm body of the present invention, a correction block is inserted into the roller mounting hole of an intermediate product, and the roller mounting hole portion of the intermediate product is pressed from the outside so that the inside of the roller mounting hole is pressed. The solution to this problem was to smooth the sides and at the same time press the claws to correct the distance between the claws.
「作用 」
製造された中間製品の爪を押圧すると、爪が矯正されて
、その間の距離のバラツキが小となる。"Function" When the claws of the manufactured intermediate product are pressed, the claws are corrected and the variation in the distance between them is reduced.
また本発明の製造方法では、爪の矯正とローラ取付穴の
矯正を同時に行うので、両者の処理が互いに悪影響を及
ぼすのを回避でき、爪の部分とローラ取り付は部を共に
精度良く仕上げることができる。In addition, in the manufacturing method of the present invention, since the claws are straightened and the roller mounting holes are straightened at the same time, it is possible to avoid the two processes from having a negative effect on each other, and it is possible to finish both the claw part and the roller mounting part with high precision. I can do it.
さらに本発明の製造方法では、爪の押圧をローラ取付穴
の矯正と同時に行うので、新たに処理工程を増やす必要
がない。従ってこの製造方法によれば、ロッカアームを
効率良く製造できる。Furthermore, in the manufacturing method of the present invention, since the pressing of the claws is carried out at the same time as the correction of the roller mounting hole, there is no need to add a new processing step. Therefore, according to this manufacturing method, the rocker arm can be manufactured efficiently.
「実施例」
以下、図面を参照して本発明のロッカアーム本体の製造
方法を詳しく説明する。"Example" Hereinafter, a method for manufacturing a rocker arm main body of the present invention will be described in detail with reference to the drawings.
この製造方法では、まず精密鋳造法によりロッカアーム
本体２の中間製品（以下、中間製品２と記す）を製造す
る。この中間製品２の爪１．１間の距離は、最終寸法よ
りも若干大きく形成されている。またローラ取付穴３の
内側面３ａ、３ａ間の距離も最終寸法よりも若干大きく
形成されている。In this manufacturing method, first, an intermediate product of the rocker arm body 2 (hereinafter referred to as intermediate product 2) is manufactured by a precision casting method. The distance between the claws 1.1 of this intermediate product 2 is formed to be slightly larger than the final dimension. Further, the distance between the inner surfaces 3a, 3a of the roller mounting hole 3 is also formed to be slightly larger than the final dimension.
この製造方法では、第１図および第２図に示すようにロ
ーラ取付穴３の内側面３ ａ、 ３ ａが水平になるよ
うにして、中間製品２をプレス装置の受は金具５上に載
置する。この状態で、ローラ取付穴３に矯正ブロック６
を挿入する。そしてこの状態で押し金具７を下降させて
、ロッカアーム本体２を押圧する。In this manufacturing method, as shown in FIGS. 1 and 2, the intermediate product 2 is placed on the metal fitting 5 of the press device so that the inner surfaces 3a, 3a of the roller mounting hole 3 are horizontal. place In this state, the correction block 6 is inserted into the roller mounting hole 3.
Insert. In this state, the pusher 7 is lowered to press the rocker arm body 2.
前記受は金具５および押し金具７は、中間製品２のロー
ラ取付穴３の内側面３ａ、３ａと対向する外側面２ ａ
、 ２ ａに当接する部分、（以下、ローラ取付穴部矯
正部と記す）５ａ、７ａと、爪１．１に当接する部分（
以下風矯正部と記す）５ｂ、７ｂとを備えたものである
。これら金具５．７の爪矯正部５ ｂ、 ７ ｂの深さ
は、ローラ取付穴部矯正部５ ａ、 ７ ａが中間製品
２の外側面２ ａ、 ２ ａを圧接して所定の距離まで
近付いたときに、中間製品２の爪１．１をその間隔が適
切な寸法になるように矯正できる寸法に形成されている
。The receiver is the metal fitting 5 and the push metal fitting 7 is an outer surface 2a facing the inner surfaces 3a, 3a of the roller mounting hole 3 of the intermediate product 2.
, 2a, (hereinafter referred to as the roller mounting hole correction part) 5a, 7a, and the part that contacts the claw 1.1 (
(hereinafter referred to as wind correction section) 5b and 7b. The depth of the claw correction parts 5 b, 7 b of these metal fittings 5.7 is such that the roller mounting hole correction parts 5 a, 7 a press against the outer surfaces 2 a, 2 a of the intermediate product 2 to a predetermined distance. The dimensions are such that when approached, the claws 1.1 of the intermediate product 2 can be corrected so that the spacing between them becomes an appropriate dimension.
また前記矯正ブロック６は直方体状のもので、その水平
な２面が中間製品２のローラ取付穴３の内側面３ａ、３
ａに当接する矯正面６ａ、６ａとされたものである。こ
の矯正ブロック６の矯正面６ａ、６ａは、平行度が０．
０１以下、面粗度がＩＳ〜６Ｓ。The correction block 6 has a rectangular parallelepiped shape, and its two horizontal surfaces are the inner surfaces 3a and 3 of the roller mounting hole 3 of the intermediate product 2.
The correcting surfaces 6a, 6a are in contact with a. The correction surfaces 6a, 6a of this correction block 6 have a parallelism of 0.
01 or less, surface roughness is IS to 6S.
硬度がＨＲＣ５８〜６５に仕上げられている。またこの
矯正ブロック６の矯正面６ ａ、 ６ ａ間の距離は、
この矯正ブロック６が、中間製品２のローラ取付穴３に
挿入されたとき、内側面３ａ、３ａとの間にそれぞれ０
．０５〜０．４５ｍ１１１程度の間隙が形成されるよう
に設定されている。Finished with a hardness of HRC58-65. Moreover, the distance between the correction surfaces 6a, 6a of this correction block 6 is:
When this correction block 6 is inserted into the roller mounting hole 3 of the intermediate product 2, there is no difference between the inner surfaces 3a and 3a.
．． It is set so that a gap of about 0.05 to 0.45 m111 is formed.
前記押し金具７によるプレス圧は、できるだけ高圧であ
ることが望ま１２いが、ローラ取付穴３の内側面３ａ、
３ａの仕上がり状態や、内側面３ ａ、 ３ ａ問おｉ
び爪１．１間の仕」−かり寸法、矯正ブロック６と「Ｊ
−ラ取付穴３との間の隙間量等を考慮して設定される、
。It is desirable that the press pressure by the pusher 7 be as high as possible, but the inner surface 3a of the roller mounting hole 3,
Please check the finished condition of 3a, the inner surface 3a, and 3a questions.
The dimensions between the jaws 1.1 and 1.1, the correction block 6 and the
- Set by taking into account the amount of clearance between the mounting hole 3, etc.
.
上述のようにして押（２金具７で中間製品２を押圧する
と、ローラ取付穴３の内側面３ａ、３ａが矯正ブロック
６の矯正面６ ａ、 ６ ａに強く押し付けられて塑性
変形する。この結果、内側面３ａ、３ａの而粗さが改善
される。また内側面３ａ、３ａを形成４る側壁１０．１
０が押されて、内側面３ ａ、 ３ ａｍｉの距離が矯
正ブロック６の矯正面６ａ、６ａ間の距離に等１．くな
る。さらに爪１．１が金具５．７の爪矯正部５ ｂ、
７ ｂによって押し縮められて、所定寸法となる。When the intermediate product 2 is pressed with the two metal fittings 7 as described above, the inner surfaces 3a, 3a of the roller mounting holes 3 are strongly pressed against the straightening surfaces 6a, 6a of the straightening block 6, causing plastic deformation. As a result, the roughness of the inner surfaces 3a, 3a is improved.In addition, the side walls 10.1 forming the inner surfaces 3a, 3a are improved.
0 is pressed, and the distance between the inner surfaces 3 a and 3 ami is equal to the distance between the correction surfaces 6 a and 6 a of the correction block 6 1. It becomes. Furthermore, the nail 1.1 is a nail correction part 5b of the metal fitting 5.7,
7b and is compressed to a predetermined size.
以上１のようにして中間製品２のプレス矯正が終了Ｉ７
たあと、押し金具７を上昇させ、矯正ブロック６を引き
抜く。そしてロッカアーノ・本体２の端部側に配置され
た払い出し用シリンダのロッド８でロッカアーム本体２
を押す。すると処理されたロッカアーム本体２が受は金
具５の爪矯正部５１）側に連設されたシュート９から排
出される。The press straightening of the intermediate product 2 is completed as described in 1 above.I7
After that, the pusher 7 is raised and the correction block 6 is pulled out. Then, the rod 8 of the dispensing cylinder placed on the end side of the rocker arm body 2
Press. Then, the treated rocker arm body 2 is discharged from a chute 9 connected to the nail correction part 51) side of the metal fitting 5.
このロッカア・−ム本体の製造方法によれば、精密鋳造
された中間製品２の爪１．１を金具５，７の爪矯正部５
ｂ、７ ｂで押圧するので、爪１．ｌの部分が塑性変形
（７てその距離が矯正される。従って、この製造方法に
よれば、ロッカアーム本体２の爪１．１間の距離のバラ
ツキを小さくすることができろ。According to this method of manufacturing the rocker arm main body, the nail 1.1 of the precision-cast intermediate product 2 is inserted into the nail correction part 5 of the metal fittings 5, 7.
b, 7 Since the pressure is applied with b, claw 1. The distance between the claws 1.1 of the rocker arm main body 2 can be reduced by this manufacturing method.
また爪１．１の矯正とローラ取イ・ｊ穴３の部分の矯正
を別々？こ行った場合Ｊこは、先１こ処理され）、三部
分が後の処理の影響で変形１．て仕上げ精度が損なわれ
るのに対して、この製造方法では、爪■；■の矯正とロ
ーラ取付穴３の部分の矯正を同時に行うので、両者の処
理が互いに悪影響を及ぼずのを回避でき、爪１，１間の
距離の矯正、ローラ取付穴３の内側面３ａ、３ａ間の距
離の矯正および内側面３ａ、３ａの而粗ざの改善のいず
れをも）を足に行うことができる。Also, is the correction of the claw 1.1 and the correction of the roller receptacle/J hole 3 done separately? If you do this, the first part will be processed), and the three parts will be deformed due to the influence of the later processing. In contrast, in this manufacturing method, the correction of the claws ■;■ and the correction of the roller mounting hole 3 are performed at the same time, so it is possible to avoid the two processes from having a negative effect on each other. It is possible to correct the distance between the claws 1, 1, correct the distance between the inner surfaces 3a of the roller mounting hole 3, and improve the roughness of the inner surfaces 3a, 3a.
さらにこの製造方法では、爪１．１の部分の矯正をロー
ラ取付穴３の部分の矯正と同時に行うので、新たに処理
工程を増やす必要がない。従ってこの製造方法によれば
、ロッカアーム本体２を効率良く製造できる。Further, in this manufacturing method, since the portion of the claw 1.1 is corrected at the same time as the portion of the roller attachment hole 3, there is no need to add a new processing step. Therefore, according to this manufacturing method, the rocker arm main body 2 can be manufactured efficiently.
（実験例） 次に、実験例を挙げてこの発明の効果を明確にする。(Experiment example) Next, an experimental example will be given to clarify the effects of this invention.
精密鋳造されたロッカアーム本体２を１０００個用意し
て、これを前述の方法で矯正した。矯正前、矯正後に、
それぞれ爪１，１間の距離、ローラ取付穴３の内側面３
ａ、３ａ間の距離、および内側面３ａ、３ａの面粗度を
調べた。結果を第１表に示す。1000 precision-cast rocker arm bodies 2 were prepared and corrected by the method described above. Before and after correction,
Distance between claws 1 and 1, inner surface 3 of roller mounting hole 3, respectively
The distance between a and 3a, and the surface roughness of the inner surfaces 3a and 3a were investigated. The results are shown in Table 1.
なお加工条件は、以下の通りであった。The processing conditions were as follows.
被加工物（精密鋳造品）
材質：Ｓ０Ｍ２１
硬度： ＨＲＢ９２ 〜１０２
プレス圧カニｌ２ｔｏｎ 加圧時間 ０．５秒第１表
この結果から明らかであるように、この製造方法によれ
ば、短時間のプレスによって、爪１゜１間の距離のバラ
ツキ、口・−ラ取付穴３の内側面３ａ、３ａ間の距離の
バラツキを小さくでき、内側面３ａ、３ａの面粗ざら改
善できることが確認された。Workpiece (precision casting) Material: S0M21 Hardness: HRB92 ~ 102 Press pressure 12 tons Pressure time 0.5 seconds Table 1 As is clear from the results, this manufacturing method allows for short press times. It was confirmed that the variation in the distance between the claws 1.degree.1 and the variation in the distance between the inner surfaces 3a, 3a of the opening and -ra mounting holes 3 can be reduced, and the surface roughness of the inner surfaces 3a, 3a can be improved.
「発明の効果」
以上説明１−たように本発明のロッカアーム本体の製造
方法は、所定の形状に成形された中間製品のローラ取付
穴に矯正ブロックを挿入して中間製品のローラ取付穴の
部分を外側から押圧しローラ取付穴の内側面を平滑に仕
上げると同時に、爪の部分を押圧して爪間距離を矯正す
る方法なので、爪の部分が塑性変形してその距離が矯正
される。"Effects of the Invention" As explained above in 1-1, the method for manufacturing a rocker arm main body of the present invention involves inserting a correction block into the roller mounting hole of an intermediate product formed into a predetermined shape. In this method, the inner surface of the roller mounting hole is smoothed by pressing from the outside, and at the same time, the distance between the claws is corrected by pressing the claw portion, so the claw portion is plastically deformed and the distance is corrected.
従って、本発明の製造方法によれば、ロッカアーム本体
の爪間の距離のバラツキを小さくすることができる。Therefore, according to the manufacturing method of the present invention, variations in the distance between the claws of the rocker arm body can be reduced.
また本発明の製造方法では、爪の矯正とローラ取付穴の
部分の矯正を同時に行うので、両者の処理が互いに悪影
響を及ぼすのを回避でき、爪間の距離の矯正、ローラ取
付穴の内側面間の距離の矯正および内側面の面粗さの改
善のいずれを６満足さ仕ることができる。In addition, in the manufacturing method of the present invention, since the claws are straightened and the roller mounting hole portion is corrected at the same time, it is possible to avoid the two processes from having a negative effect on each other, and the distance between the claws is corrected and the inner surface of the roller mounting hole is corrected. It is possible to correct the distance between the parts and improve the surface roughness of the inner surface.
さらに本発明の製造方法では、爪の部分の矯正をローラ
取付穴の部分の矯正と同時に行うので、新たに処理工程
を増やす必要がない。従って本発明の製造方法によれば
、ロッカアーム本体を効率良く製造できる。Furthermore, in the manufacturing method of the present invention, since the claw portion is corrected at the same time as the roller mounting hole portion, there is no need to add a new processing step. Therefore, according to the manufacturing method of the present invention, the rocker arm main body can be manufactured efficiently.
第１図は本発明のロッカアーム本体の製造方法の一実施
例の主要工程を示す正面図、第２図は同平面図、第３図
および第４図はロッカアームの構成を示す図で、
第３図は平面図、
第４図は正面図
である。
・・・爪、
２ ・
ロッカアーム本体（中間製品）、
・・ローラ取付穴、
３ａ・・内側面、
・・ローラ、
・・・受は金具、
・・矯正ブロック、
７・・・押し金具、
Ａ・・・中心線。FIG. 1 is a front view showing the main steps of an embodiment of the method for manufacturing a rocker arm body of the present invention, FIG. 2 is a plan view of the same, and FIGS. 3 and 4 are views showing the structure of the rocker arm. The figure is a plan view, and Figure 4 is a front view. ...Claw, 2. Rocker arm body (intermediate product), ...Roller mounting hole, 3a..Inner surface, ...Roller, ...Bracket is metal fitting, ...Correction block, 7. Push metal fitting, A. ...center line.
Claims (1)
心線上にカムに当接するローラの収容されるローラ取付
穴が形成されたロッカアーム本体の製造方法であって、 所定の形状に成形された中間製品のローラ取付穴に矯正
ブロックを挿入して中間製品のローラ取付穴の部分を外
側から押圧しローラ取付穴の内側面を平滑に仕上げると
同時に、爪の部分を押圧して爪間距離を矯正することを
特徴とするロッカアーム本体の製造方法。[Scope of Claims] A method for manufacturing a rocker arm body, in which claws that abut a valve are formed on both sides of a center line, and a roller mounting hole is formed on the center line in which a roller that abuts a cam is accommodated, the method comprising: Insert a straightening block into the roller mounting hole of the intermediate product formed into the shape of and press the roller mounting hole part of the intermediate product from the outside to smooth the inner surface of the roller mounting hole and press the claw part at the same time. A method for manufacturing a rocker arm body, characterized in that the distance between the claws is corrected by correcting the distance between the claws.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25015689A JP2653185B2 (en) | 1989-09-26 | 1989-09-26 | Rocker arm body manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25015689A JP2653185B2 (en) | 1989-09-26 | 1989-09-26 | Rocker arm body manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03110040A true JPH03110040A (en) | 1991-05-10 |
| JP2653185B2 JP2653185B2 (en) | 1997-09-10 |
Family
ID=17203658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25015689A Expired - Lifetime JP2653185B2 (en) | 1989-09-26 | 1989-09-26 | Rocker arm body manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2653185B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5946800A (en) * | 1996-07-31 | 1999-09-07 | Nippon Piston Ring Co., Ltd. | Method for producing rocker arms |
-
1989
- 1989-09-26 JP JP25015689A patent/JP2653185B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5946800A (en) * | 1996-07-31 | 1999-09-07 | Nippon Piston Ring Co., Ltd. | Method for producing rocker arms |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2653185B2 (en) | 1997-09-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2698002C1 (en) | Method of making pressed article, press and pressing line | |
| JPH03110040A (en) | Production of rocker arm body | |
| JP3934491B2 (en) | Rocker arm and manufacturing method thereof | |
| US20050087162A1 (en) | Method of forming a cam-engaged rocker arm | |
| JP2004255385A (en) | Manufacturing method of cylindrical metal case | |
| KR101751400B1 (en) | A fixing bracket | |
| KR100430783B1 (en) | Core Mamufacturing method of solenoid valve for transmission | |
| JPH01241347A (en) | Manufacture of crank shaft | |
| JP3636263B2 (en) | Manufacturing method of rocker arm body | |
| JPH039805B2 (en) | ||
| JPH08103825A (en) | Method for forming forked member and die therefor | |
| JP3494532B2 (en) | Rocker arm manufacturing method | |
| JPH06179035A (en) | Manufacture of crank shaft | |
| CN107004993A (en) | A kind of manufacture method and manufacturing equipment of USB interface metal shell | |
| CN212945209U (en) | Forging die of valve body for medical equipment | |
| JPH03204123A (en) | Manufacture of flange member | |
| JPH0191931A (en) | Production of rocker arm | |
| JPS63273539A (en) | Production of bevel gear | |
| JP2775684B2 (en) | Press forming method | |
| JP2003326320A (en) | Method for bending metallic sheet | |
| JPH07269311A (en) | Working method for rocker arm | |
| JP2001060650A (en) | Lead forming device and method of semiconductor device | |
| JPH04127928A (en) | Method for forging hollow part having undercut | |
| JPH08174131A (en) | Full enclosed die forging of stepped extended shaft parts | |
| JPH03151123A (en) | Manufacture of piston |