JPH03181655A - Manufacture of cam shaft - Google Patents
Manufacture of cam shaftInfo
- Publication number
- JPH03181655A JPH03181655A JP1323414A JP32341489A JPH03181655A JP H03181655 A JPH03181655 A JP H03181655A JP 1323414 A JP1323414 A JP 1323414A JP 32341489 A JP32341489 A JP 32341489A JP H03181655 A JPH03181655 A JP H03181655A
- Authority
- JP
- Japan
- Prior art keywords
- shaft member
- cam
- journal
- shaft
- core rod
- 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.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 238000003466 welding Methods 0.000 claims abstract description 18
- 238000005452 bending Methods 0.000 claims abstract description 17
- 238000005496 tempering Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 abstract description 19
- 230000001678 irradiating effect Effects 0.000 abstract 1
- 238000005255 carburizing Methods 0.000 description 8
- 238000010791 quenching Methods 0.000 description 5
- 230000000171 quenching effect Effects 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 235000019353 potassium silicate Nutrition 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Landscapes
- Laser Beam Processing (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Gears, Cams (AREA)
- Welding Or Cutting Using Electron Beams (AREA)
Abstract
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明はカムシャフトの製造方法に関する。[Detailed description of the invention] (Industrial application field) The present invention relates to a method for manufacturing a camshaft.
（従来の技術）
エンジンの多弁化等に伴い、複雑な形状のカムシャフト
が要求されるようになってきたため、カムシャフトの製
造方法としては、従来から知られている鍛造若しくは鋳
造により得たカムシャフト素材を機械加工する方法に代
えて、実開昭４８−９８０５号公報に示されるように、
中空部を有するカム部材及びジャーナル部材と、シャフ
ト部材とを各々別個に設けておき、カム部材及びジャー
ナル部材の中空部にシャフト部材を嵌入した後、カム部
材及びジャーナル部材とシャフト部材とを各々溶接する
方法が提案されている。(Prior art) As engines have become more multi-valve, camshafts with complex shapes have become required.As a method of manufacturing camshafts, cams obtained by forging or casting, which have been known in the past, have become necessary. Instead of machining the shaft material, as shown in Japanese Utility Model Application Publication No. 48-9805,
A cam member and a journal member each having a hollow part and a shaft member are provided separately, and after the shaft member is fitted into the hollow part of the cam member and journal member, the cam member and journal member and the shaft member are each welded. A method has been proposed.
（発明が解決しようとする課題）
ところが、カム部材及びジャーナル部材とシャフト部材
とを溶接する際、カム部材及びジャーナル部材の中空部
の周方向に沿って溶接していくと、シャフト部材が撓み
変形するという問題がある。(Problem to be Solved by the Invention) However, when welding the cam member and the journal member to the shaft member, if welding is carried out along the circumferential direction of the hollow portion of the cam member and the journal member, the shaft member may be bent and deformed. There is a problem with doing so.
つまり、溶接開始点から周方向へ１８０度移動した部位
が収縮して縮むため、シャフト部材が溶接部でへの字状
に曲がるという問題がある。特に、近時におけるエンジ
ンの軽量化の要請からシャフト部材としてパイプを用い
る場合には、シャフト部材の曲がり変形は顕著である。In other words, since the portion that has moved 180 degrees in the circumferential direction from the welding start point contracts and shrinks, there is a problem in that the shaft member is bent in a U-shape at the welding portion. In particular, when a pipe is used as a shaft member due to the recent demand for weight reduction of engines, bending and deformation of the shaft member is significant.
また、浸炭焼入れ等の表面硬化処理したカム部材及びジ
ャーナル部材をシャフト部材に溶接する場合、シャフト
部材が変形すると、カム部材及びジャーナル部材の表面
に対する研削代が大きくなって表面硬化層が残らなかっ
たり、或いは表面硬化層を残そうとすると未研削部が生
じて所定の形状が得られないという問題がある。Additionally, when welding a cam member and journal member that have been surface hardened by carburizing and quenching to a shaft member, if the shaft member deforms, the grinding allowance for the surface of the cam member and journal member becomes large, and the hardened surface layer may not remain. Alternatively, if an attempt is made to leave the surface hardened layer, there is a problem that unground portions are generated and a predetermined shape cannot be obtained.
上記に鑑みて、本発明は、カム部材及びジャーナル部材
とシャフト部材とを各々溶接してカムシャフトを製造す
る方法であるにも拘らず、溶接によってシャフト部材が
曲がるのを防止することを目的とする。In view of the above, although the present invention is a method of manufacturing a camshaft by welding a cam member, a journal member, and a shaft member, it is an object of the present invention to prevent the shaft member from being bent due to welding. do.
（課題を解決するための手段）
上記の目的を達成するため、本発明は、シャフト部材の
曲がりを阻止した状態でカム部及びジャーナル部とシャ
フト部材とを溶接し、次に、シャフト部材に対して焼戻
しをすることによってシャフト部材に生じた応力を解放
させるものである。(Means for Solving the Problems) In order to achieve the above object, the present invention welds the cam part and the journal part to the shaft member in a state where bending of the shaft member is prevented, and then welds the shaft member to the shaft member. By tempering the shaft member, the stress generated in the shaft member is released.
具体的に本発明が講じた解決手段は、カム部材及びジャ
ーナル部材をバイブ製のシャフト部材に嵌装すると共に
該シャフト部材の中空部に芯棒を挿入して該シャフト部
材の曲がりを阻止し、次に、該カム部材及びジャーナル
部材とシャフト部材とを各々溶接した後、該シャフト部
材に対して焼戻しを行ない、しかる後、上記シャフト部
材の中空部から上記芯棒を抜き去る構成とするものであ
る。Specifically, the solution taken by the present invention is to fit a cam member and a journal member into a shaft member made of a vibrator, and insert a core rod into a hollow part of the shaft member to prevent the shaft member from bending. Next, after welding the cam member, the journal member, and the shaft member, the shaft member is tempered, and then the core rod is removed from the hollow portion of the shaft member. be.
（作用）
上記の構成により、シャフト部材の中空部に芯棒を挿入
してシャフト部材の曲がりを阻止した状態で、カム部材
及びジャーナル部材とシャフト部材とを溶接するため、
溶接した状態ではシャフト部材は曲がっていない。(Function) With the above configuration, the cam member and journal member are welded to the shaft member while the core rod is inserted into the hollow portion of the shaft member to prevent the shaft member from bending.
The shaft member is not bent in the welded state.
また、シャフト部材に焼戻しを行なった後、該シャフト
部材から芯棒を引き抜くため、溶接により生じたシャフ
ト部材の溶接部における応力は焼戻しによって解放され
ているため、芯棒を引き抜いてもシャフト部材は殆ど曲
がらない。In addition, since the core rod is pulled out from the shaft member after tempering the shaft member, the stress generated at the welded part of the shaft member due to welding is released by tempering, so even if the core rod is pulled out, the shaft member will not remain intact. It hardly bends.
（実施例）
以下、本発明の実施例を第１図〜第３図に基づいて説明
する。(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3.
まず、例えばＪＩＳ−ＳＣＭ４１５Ｈよりなる素材を所
定形状に機械加工してカム部材１及びジャーナル部材２
を製作する。その後、カム部材１及びジャーナル部材２
の溶接割れを防止するため溶接箇所に防炭処理を施した
後、該カム部材１及びジャーナル部材２に浸炭焼入れ及
び焼戻しを行ない、カム部材１及びジャーナル部材２の
表面に表面硬化層を形成する。尚、防炭処理としては、
溶接箇所に防炭材としての水ガラスを塗布しておき、浸
炭焼入れ後にワイヤブラシ等で水ガラスを除去する方法
、或いは溶接箇所にニッケルめっき又は銅めっきをして
溶接箇所をマスキングしておく方法等を適用できる。ま
た、この場合の焼戻しは、カム部材１及びジャーナル部
材２に対する靭性の付与と熱歪みの除去のために行なう
ものである。First, a material made of JIS-SCM415H, for example, is machined into a predetermined shape to form a cam member 1 and a journal member 2.
Manufacture. After that, the cam member 1 and the journal member 2
After carburizing the welded parts to prevent weld cracks, the cam member 1 and journal member 2 are carburized, hardened and tempered to form a surface hardening layer on the surfaces of the cam member 1 and journal member 2. . In addition, as anti-charcoal treatment,
A method of applying water glass as a carburizing material to the welding area and removing the water glass with a wire brush etc. after carburizing and quenching, or a method of masking the welding area by applying nickel plating or copper plating to the welding area. etc. can be applied. Further, the tempering in this case is performed to impart toughness to the cam member 1 and the journal member 2 and to remove thermal distortion.
また、例えばＪ Ｉｓ−Ｓｌ５−５ＴＫよりなる素材を
所定形状に機械加工してパイプ製のシャフト部材３を製
作する。Further, the shaft member 3 made of a pipe is manufactured by machining a material made of, for example, J Is-Sl5-5TK into a predetermined shape.
次に、カム部材１及びジャーナル部材２をシャフト部材
３に嵌装した後、カム部材１及びジャーナル部材２を軸
方向の所定位置にセットする。Next, after fitting the cam member 1 and the journal member 2 onto the shaft member 3, the cam member 1 and the journal member 2 are set at predetermined positions in the axial direction.
次に、シャフト部材３の中空部３ａに挿入されて該シャ
フト部材３の曲がりを阻止する芯棒５を準備する。Next, a core rod 5 is prepared which is inserted into the hollow portion 3a of the shaft member 3 to prevent the shaft member 3 from bending.
芯棒５の直径としては、シャフト部材３の中空部３ａの
内径よりも若干径小に形成することが好ましく、具体的
には、シャフト部材３の曲がり量を少なくするために、
芯棒５の外周面とシャフト部材３の内周面とのクリアラ
ンスを０．５ｍｍ以下に設定することが好ましい。この
場合、クリアランスは小さいほうが好ましいが、０．
０５ｍｍ未満に設定することは、加工精度の確保に工数
及び費用が掛かる反面、それに伴う効果が得られないの
で、クリアランスは０．０５ｍｍ以上が好ましい。The diameter of the core rod 5 is preferably slightly smaller than the inner diameter of the hollow portion 3a of the shaft member 3. Specifically, in order to reduce the amount of bending of the shaft member 3,
It is preferable that the clearance between the outer peripheral surface of the core rod 5 and the inner peripheral surface of the shaft member 3 is set to 0.5 mm or less. In this case, it is preferable that the clearance be small, but 0.
If the clearance is set to less than 0.05 mm, it will take more man-hours and costs to ensure machining accuracy, but the effects associated with it will not be obtained. Therefore, the clearance is preferably 0.05 mm or more.
また、芯棒５の材質としては、シャフト部材３の曲がり
を阻止するために剛性の高いことが好ましいが、実用的
には通常の鋼部材で十分である。Further, as for the material of the core rod 5, it is preferable that the material has high rigidity in order to prevent bending of the shaft member 3, but for practical purposes, a normal steel member is sufficient.
すなわち、通常の鋼部材よりも剛性の高いものとしてタ
ングステン鋼やモリブデン鋼等があるが、これらはいず
れも高価であるし、シャフト部材３の外径が大きい場合
にはそれに伴って内径も大きくなり、ひいては芯棒５の
直径も大きくなって剛性が高くなるためである。In other words, there are tungsten steel, molybdenum steel, etc. that have higher rigidity than normal steel members, but they are all expensive, and when the outer diameter of the shaft member 3 is large, the inner diameter also becomes larger accordingly. This is because the diameter of the core rod 5 becomes larger and the rigidity becomes higher.
次に、第１図に示すように、芯棒５をシャフト部材３の
中空部３ａに挿入して該シャフト部材３の曲がりを阻止
した後、高エネルギービーム６例えばレーザービーム或
いは電子ビーム等を照射して、カム部材１及びジャーナ
ル部材２とシャフト部材３とを各々全周に亘って溶接し
てカムシャフト素材７を得る。この場合、シャフト部材
３は芯棒５により曲がりを阻止されているので、高エネ
ルギービーム６で溶接しても曲がらない。Next, as shown in FIG. 1, after inserting the core rod 5 into the hollow portion 3a of the shaft member 3 to prevent the shaft member 3 from bending, a high-energy beam 6 such as a laser beam or an electron beam is irradiated. Then, the cam member 1, the journal member 2, and the shaft member 3 are each welded over the entire circumference to obtain a camshaft material 7. In this case, since the shaft member 3 is prevented from bending by the core rod 5, it will not bend even if welded with the high-energy beam 6.
次に、溶接後のカムシャフト素材７に対して芯棒５が挿
入された状態で焼戻しを行なう。この焼戻し工程におけ
る加熱温度としては、浸炭焼入れにより形成されたカム
部材１及びジャーナル部材２の表面硬化層の軟化を避け
るために、浸炭焼入れ後に行なう焼戻し工程での加熱温
度と同程度の温度に加熱して行なうことが好ましく、具
体的には、２００℃以下の温度に加熱することが好まし
い。その理由は、浸炭焼入れ後の焼戻し工程での加熱は
通常２００℃以下で行われており、この範囲であれば表
面硬化層の硬さが殆ど低下しない一方、２００℃を越え
ると急激に硬さが低下するためである。Next, the camshaft material 7 after welding is tempered with the core rod 5 inserted therein. The heating temperature in this tempering step is approximately the same as the heating temperature in the tempering step performed after carburizing and quenching, in order to avoid softening of the surface hardened layers of the cam member 1 and journal member 2 formed by carburizing and quenching. It is preferable to carry out the heating at a temperature of 200° C. or lower. The reason for this is that heating in the tempering process after carburizing and quenching is usually carried out at a temperature below 200°C, and while within this range the hardness of the hardened surface layer hardly decreases, when the temperature exceeds 200°C, the hardness rapidly decreases. This is because the
次に、第２図に示すように、シャフト部材３の中空部３
ａから芯棒５を抜き去る。Next, as shown in FIG. 2, the hollow portion 3 of the shaft member 3
Remove the core rod 5 from a.
このようにしてカムシャフト素材７に焼戻しを行なった
後に芯棒５を引き抜くと、溶接によって生じていたシャ
フト部材３の溶接部における応力は焼戻しによって解放
されているので、シャフト部材３の中空部３ａから芯棒
５を引き抜いてもシャフト部材３は曲がらない。When the core rod 5 is pulled out after the camshaft material 7 has been tempered in this way, the stress in the welded part of the shaft member 3 caused by welding has been released by the tempering, so the hollow part 3a of the shaft member 3 is removed. Even if the core rod 5 is pulled out, the shaft member 3 does not bend.
次に本発明を評価するために行なったシャフト部材３の
曲がりｆｉｌｌ定テス定心ストて説明する。Next, the bending fill and centering tests of the shaft member 3 which were conducted to evaluate the present invention will be explained.
具体例及び比較例に供するため、Ｊ Ｉ Ｓ−５ＣＭ５
−５Ｃよりなるカム部材１及びジャーナル部材２と、Ｊ
Ｉ Ｓ−８Ｔ５−８ＴＫよりなるシャフト部材３と、
Ｊ Ｉ Ｓ−５４５Ｃよりなりシャフト部材３の内周面
とのクリアランスが０．１５ｍｍに設定された芯棒５と
を準備した。For specific examples and comparative examples, JIS-5CM5
- A cam member 1 and a journal member 2 made of 5C, and a J
A shaft member 3 made of IS-8T5-8TK,
A core rod 5 made of JIS-545C and having a clearance of 0.15 mm with respect to the inner peripheral surface of the shaft member 3 was prepared.
次に、カム部材１及びジャーナル部材２に対して防炭処
理した後、浸炭焼入れをし、その後１９０℃の温度下で
２時間保持した後、徐冷して焼戻しを行なった。その後
、カム部材１及びジャーナル部材２をシャフト部材３に
嵌装すると共に、シャフト部材３の中空部３ａに芯棒５
を挿入し、この状態でカム部材１及びジャーナル部材２
とシャフト部材３とを各々溶接してカムシャフト素材７
を得た。Next, the cam member 1 and the journal member 2 were subjected to carburizing treatment, then carburized and quenched, held at a temperature of 190° C. for 2 hours, and then gradually cooled and tempered. Thereafter, the cam member 1 and the journal member 2 are fitted into the shaft member 3, and the core rod 5 is inserted into the hollow part 3a of the shaft member 3.
Insert the cam member 1 and journal member 2 in this state.
and shaft member 3 are welded to form a camshaft material 7.
I got it.
次に、具体例としては、カムシャフト素材７を１９０℃
の温度下で１時間保持した後、徐冷して焼戻しを行ない
、その後、芯棒５をシャフト部材３から抜き去ってカム
シャフトを得た。Next, as a specific example, the camshaft material 7 is heated to 190°C.
After being held at a temperature of 1 for 1 hour, it was slowly cooled and tempered, and then the core rod 5 was removed from the shaft member 3 to obtain a camshaft.
また、比較例としては、カムシャフト素材７を焼き戻す
ことなく、芯棒５をシャフト部材５から抜き去ってカム
シャフトを得た。この場合、シャフト部材５の溶接部に
おける応力は解放されていないので、芯棒５を引き抜く
のに大きな力を必要とした。Further, as a comparative example, a camshaft was obtained by removing the core rod 5 from the shaft member 5 without tempering the camshaft material 7. In this case, since the stress at the welded portion of the shaft member 5 was not released, a large force was required to pull out the core rod 5.
その結果、具体例により得たカムシャフトは曲げ変形が
少なく、振れの最大値が０．１７ｍｍであったのに対し
て、比較例により得たカムシャフトは曲げ変形が大きく
、振れの最大値はｏ、３５ｍｍであって、本発明の効果
を確認できた。As a result, the camshaft obtained in the specific example had little bending deformation and the maximum value of runout was 0.17 mm, whereas the camshaft obtained in the comparative example had large bending deformation and the maximum value of runout was 0.17 mm. o, 35 mm, and the effect of the present invention could be confirmed.
また、カム部材１及びジャーナル部材２には予め、片面
０．１ｍｍの研削代を設けていたため、具体例により得
たカムシャフトでは所定の形状に研削できたが、比較例
により得たカムシャフトにおいては、凸部側では研削量
が過大となる反面、凹部側では未研削部が生じて所定の
形状を得ることができなかった。In addition, since the cam member 1 and the journal member 2 were provided with a grinding allowance of 0.1 mm on one side in advance, the camshaft obtained in the specific example could be ground into a predetermined shape, but the camshaft obtained in the comparative example In this case, the amount of grinding was excessive on the convex side, but on the other hand, unground portions were generated on the concave side, making it impossible to obtain a predetermined shape.
（発明の効果）
以上説明したように、本発明に係るカムシャフトの製造
方法によると、シャフト部材の中空部に芯棒を挿入して
シャフト部材の曲がりを阻止した状態で溶接し、次にシ
ャフト部材に対して焼戻しを行なって溶接部の応力を解
放してから芯棒を引き抜くため、芯棒を引き抜いてもシ
ャフト部材は殆ど曲がらない。このように本発明の方法
によると、カム部材及びジャーナル部材とシャフト部材
とを溶接しているにも拘らず、シャフト部材に発生する
曲がりを少なくすることができる。(Effects of the Invention) As explained above, according to the method for manufacturing a camshaft according to the present invention, the core rod is inserted into the hollow part of the shaft member to prevent the shaft member from bending, and then the shaft member is welded. Since the core rod is pulled out after the member is tempered to release the stress in the welded part, the shaft member hardly bends even if the core rod is pulled out. As described above, according to the method of the present invention, even though the cam member and journal member are welded to the shaft member, bending that occurs in the shaft member can be reduced.
第１図〜第３図は本発明の一実施例であるカムシャフト
の製造方法を示し、第１図は溶接工程の断面図、第２図
は芯棒の引き抜き後の状態を示す断面図、第３図は各工
程を示すブロック図である。
１・・・カム部材
２・・・ジャーナル部材
３・・・シャフト部材
３ａ・・・中空部
４・・・カムシャフト素材
５・・・芯棒
６・・・高エネルギービーム
７・・・カムシャフト素材
ほか２名
第
図
１・・・カム部材
２・・・ジャーナル部材
３・・・シャフト部材
３ａ・・・中空部
４・・・カムシャフト素材
５・・・芯棒
６・・・高エネルギービーム
７・・・カムシャフト素材
し
第
図
第
図1 to 3 show a method of manufacturing a camshaft according to an embodiment of the present invention, FIG. 1 is a sectional view of the welding process, FIG. 2 is a sectional view showing the state after the core rod is pulled out, FIG. 3 is a block diagram showing each process. 1... Cam member 2... Journal member 3... Shaft member 3a... Hollow part 4... Camshaft material 5... Core rod 6... High energy beam 7... Camshaft Material and 2 other people Figure 1... Cam member 2... Journal member 3... Shaft member 3a... Hollow part 4... Camshaft material 5... Core rod 6... High energy beam 7...Camshaft material diagram
Claims (1)
ト部材に嵌装すると共に該シャフト部材の中空部に該シ
ャフト部材の曲がりを阻止するための芯棒を挿入し、次
に、該カム部材及びジャーナル部材とシャフト部材とを
各々溶接した後、該シャフト部材に対して焼戻しを行な
い、しかる後、上記シャフト部材の中空部から上記芯棒
を抜き去ることを特徴とするカムシャフトの製造方法。(1) Fit the cam member and the journal member into a shaft member made of pipe, insert a core rod into the hollow part of the shaft member to prevent the shaft member from bending, and then insert the cam member and the journal member into the hollow part of the shaft member. A method for manufacturing a camshaft, which comprises welding a member and a shaft member, tempering the shaft member, and then removing the core rod from a hollow portion of the shaft member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1323414A JPH03181655A (en) | 1989-12-12 | 1989-12-12 | Manufacture of cam shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1323414A JPH03181655A (en) | 1989-12-12 | 1989-12-12 | Manufacture of cam shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03181655A true JPH03181655A (en) | 1991-08-07 |
Family
ID=18154434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1323414A Pending JPH03181655A (en) | 1989-12-12 | 1989-12-12 | Manufacture of cam shaft |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03181655A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5836215A (en) * | 1993-07-08 | 1998-11-17 | Volkswagen Ag | Laminar cam arrangement |
| JP2003531329A (en) * | 2000-04-14 | 2003-10-21 | メルツ，カール | Camshaft, manufacturing method thereof, and manufacturing apparatus thereof |
| JP2012076731A (en) * | 2010-09-06 | 2012-04-19 | Hitachi Ltd | Manufacturing method of bogie frame for rail car and hollow structure |
-
1989
- 1989-12-12 JP JP1323414A patent/JPH03181655A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5836215A (en) * | 1993-07-08 | 1998-11-17 | Volkswagen Ag | Laminar cam arrangement |
| JP2003531329A (en) * | 2000-04-14 | 2003-10-21 | メルツ，カール | Camshaft, manufacturing method thereof, and manufacturing apparatus thereof |
| JP2012076731A (en) * | 2010-09-06 | 2012-04-19 | Hitachi Ltd | Manufacturing method of bogie frame for rail car and hollow structure |
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