JPH03185202A - Manufacture of cam shaft - Google Patents
Manufacture of cam shaftInfo
- Publication number
- JPH03185202A JPH03185202A JP32660089A JP32660089A JPH03185202A JP H03185202 A JPH03185202 A JP H03185202A JP 32660089 A JP32660089 A JP 32660089A JP 32660089 A JP32660089 A JP 32660089A JP H03185202 A JPH03185202 A JP H03185202A
- Authority
- JP
- Japan
- Prior art keywords
- cam lobe
- shaft member
- cam
- lobe
- sintered alloy
- 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 abstract description 10
- 238000003466 welding Methods 0.000 claims abstract description 21
- 239000000956 alloy Substances 0.000 claims abstract description 16
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims description 9
- 238000010791 quenching Methods 0.000 abstract description 6
- 229910000831 Steel Inorganic materials 0.000 abstract description 4
- 239000010959 steel Substances 0.000 abstract description 4
- 230000002093 peripheral effect Effects 0.000 abstract description 2
- 230000000171 quenching effect Effects 0.000 abstract 2
- 238000005304 joining Methods 0.000 abstract 1
- 238000005336 cracking Methods 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Landscapes
- 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し、特に、焼結
合金よりなるカムロブをシャフト部材の外周に嵌合して
なるカムシャフト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 for manufacturing a camshaft, and more particularly to a method for manufacturing a camshaft in which a cam lobe made of a sintered alloy is fitted onto the outer periphery of a shaft member. .
(従来の技術)
前記のように焼結合金よりなるカムロブの中空部にシャ
フト部材が嵌入されてなるエンジンのカムシャフトは、
近時のエンジンにおける軽量化及び多弁化の要請から実
用化が図られている。(Prior Art) As mentioned above, an engine camshaft in which a shaft member is fitted into a hollow part of a cam lobe made of a sintered alloy,
Practical efforts are being made to meet the recent demands for lighter weight and more valve-multiplied engines.
そして、前記のようなカムシャフトは、中空部を有する
カムロブをシャフト部材に嵌合した後、常温状態の該カ
ムロブとシャフト部材とを溶接接合することにより製造
していた。The above-mentioned camshaft has been manufactured by fitting a cam lobe having a hollow portion into a shaft member and then welding the cam lobe and the shaft member at room temperature.
ところが、焼結合金よりなるカムロブは常温状態でシャ
フト部材と溶接されると、溶接時の急激な加熱によって
残留応力が高くなるために、溶接部の境界面或いは溶接
部の内部等で焼き割れ現象が生じるという問題があった
。However, when a cam lobe made of sintered alloy is welded to a shaft member at room temperature, residual stress increases due to the rapid heating during welding, resulting in quench cracking at the interface of the weld or inside the weld. There was a problem that this occurred.
そこで、焼結合金よりなるカムロブとシャフト部材とを
溶接する際の欠陥、つまり溶接によるカムロブの焼き割
れを防止し、カムシャフトの強度を確保することが要求
されている。このため、特開昭56−136296号公
報に示されるように、焼結合金よりなるカムロブとシャ
フト部材との溶接を避け、カムロブの中空部にスチール
よりなるパイプ部材を組み込むと共に該パイプ部材の中
空部にシャフト部材を組み込み、カムロブとパイプ部材
、パイプ部材とシャフト部材とを各々溶接接合するカム
シャフトの製造方法が提案されている。Therefore, there is a need to prevent defects when welding a cam lobe made of a sintered alloy and a shaft member, that is, cracking of the cam lobe due to welding, and to ensure the strength of the camshaft. For this reason, as shown in Japanese Patent Application Laid-Open No. 56-136296, welding of the cam lobe made of a sintered alloy and the shaft member is avoided, and a pipe member made of steel is incorporated into the hollow part of the cam lobe, and the hollow part of the pipe member is A method of manufacturing a camshaft has been proposed in which a shaft member is assembled in a camshaft, and a cam lobe and a pipe member, and a pipe member and a shaft member are welded to each other.
このカムシャフトの製造方法は、スチールよりなるパイ
プ部材を介在させることにより、溶接部の低炭素化を図
って溶接時に生じる残留応力を低減させ、これにより、
焼き割れ防止を図ろうというものである。This camshaft manufacturing method uses a pipe member made of steel to reduce the residual stress generated during welding by reducing the carbon content of the welded part.
The idea is to prevent cracking.
(発明が解決しようとする課題)
しかるに、カムロブとシャフト部材との間にパイプ部材
を介在させると、前記のようにパイプ部材とシャフト部
材との溶接の他に、カムロブとパイプ部材との溶接が必
要となるため、2度の溶接接合に伴う作業工程の増加及
びコストアップは免れない。(Problem to be Solved by the Invention) However, when a pipe member is interposed between the cam lobe and the shaft member, in addition to welding the pipe member and the shaft member as described above, welding between the cam lobe and the pipe member becomes difficult. Since this is necessary, it is inevitable that the number of work steps and costs will increase due to the two-time welding process.
また、パイプ部材を組み込むことによりカムシャフトの
重量が増加するため、軽量化の点でも問題がある。Furthermore, since the weight of the camshaft increases by incorporating the pipe member, there is also a problem in terms of weight reduction.
前記に鑑みて、本発明は、作業工程の増加及びコストア
ップを招くことなく、焼結合金よりなるカムロブの溶接
割れを防止することを目的とする。In view of the above, an object of the present invention is to prevent weld cracking of a cam lobe made of a sintered alloy without increasing the number of work steps or increasing costs.
(課題を解決するための手段)
前記の目的を達成するため、本発明は、カムロブを高温
状態下で溶接することにより、カムロブの急激な温度変
化を避け、これにより溶接割れを防止しようとするもの
である。(Means for Solving the Problem) In order to achieve the above object, the present invention attempts to weld the cam lobe under high temperature conditions to avoid rapid temperature changes in the cam lobe, thereby preventing weld cracking. It is something.
具体的に本発明の講じた解決手段は、焼結合金よりなり
中空部を有するカムロブを予熱した後、該カムロブをシ
ャフト部材の外周に嵌合し、その後、前記カムロブが高
温状態にあるうちに該カムロブと前記シャフト部材とを
高エネルギービームにより溶接する構成とするものであ
る。Specifically, the solution taken by the present invention is that after preheating a cam lobe made of a sintered alloy and having a hollow part, the cam lobe is fitted onto the outer periphery of a shaft member, and then, while the cam lobe is still in a high temperature state, The cam lobe and the shaft member are welded together using a high-energy beam.
(作用)
前記の構成により、焼結合金よりなるカムロブを予熱し
、該カムロブが高温状態にあるうちにシャフト部材と溶
接するため、カムロブは溶接時に加熱されても急激に温
度変化しないので、カムロブにおける残留応力はあまり
大きくならない。(Function) With the above configuration, the cam lobe made of sintered alloy is preheated and the shaft member is welded to the cam lobe while the cam lobe is in a high temperature state. The residual stress at is not very large.
また、前記カムロブは予熱により膨脹し、膨脂状態のと
きにシャフト部材が嵌合され、常温に戻る際に収縮する
ため、該カムロブはシャフト部材を常温下で強く把持し
ている。Further, the cam lobe expands due to preheating, fits into the shaft member when in an expanded state, and contracts when returning to room temperature, so the cam lobe strongly grips the shaft member at room temperature.
(実施例)
以下、本発明に係るカムシャフトAの製造方法の一実施
例を図面に基づいて説明する。(Example) Hereinafter, an example of a method for manufacturing a camshaft A according to the present invention will be described based on the drawings.
まず、第1図に示すような焼結合金よりなり円形断面の
中空部11を有するカムロブ1を準備する。First, a cam lobe 1 made of a sintered alloy and having a hollow section 11 of circular cross section as shown in FIG. 1 is prepared.
カムロブ1の焼結合金としてはカムシャフトAに要求さ
れる耐摩耗性を満足できる程度の高炭素のちの、例えば
重量比で0.5%〜4.5%のCが配合されてなるFe
系材料が好ましく、具体的には重量比でCr二4%、M
o:1.5%、P:0.6%、C:3%、残部がFeよ
りなる焼結合金が好ましい。The sintered alloy of the cam lobe 1 is Fe, which has a high carbon content that satisfies the wear resistance required for the camshaft A, and contains, for example, 0.5% to 4.5% C by weight.
Cr-based materials are preferred, specifically 4% Cr, M
A sintered alloy consisting of o: 1.5%, P: 0.6%, C: 3%, and the balance is Fe is preferable.
また、カムロブ1の中空部11の内径は、該中空部11
に嵌入されるシャフト部材2(第2図参照)の外径より
も若干径小に設定L7ておくことが好ましく、−例とし
てはカムロブ1の内径をシャフト部材2の外径よりも0
.005mm小さく設定する。Further, the inner diameter of the hollow portion 11 of the cam lobe 1 is
It is preferable to set the diameter L7 to be slightly smaller than the outer diameter of the shaft member 2 (see Fig. 2) to be fitted into the cam lobe 1. For example, the inner diameter of the cam lobe 1 is set to 0.
.. Set it 005mm smaller.
次に、前記のようにして準備したカムロブ1を予熱する
。この場合の予熱条件としてはカムロブ1を無酸化雰囲
気中における300℃〜600℃の範囲内の温度へ加熱
することが好ましく、具体的には窒素ガス中或いはアル
ゴンガス中における450℃程度に加熱するのが好まし
い。このように無酸化雰囲気中で加熱することにより、
高炭素の焼結合金よりなるカムロブ1が酸化によってス
ケールを生じることを防止できる。Next, the cam lobe 1 prepared as described above is preheated. In this case, as a preheating condition, it is preferable to heat the cam lobe 1 to a temperature in the range of 300°C to 600°C in a non-oxidizing atmosphere, specifically, to heat it to about 450°C in nitrogen gas or argon gas. is preferable. By heating in a non-oxidizing atmosphere in this way,
The cam lobe 1 made of a high carbon sintered alloy can be prevented from forming scale due to oxidation.
次に、第2図に示すように、カムロブ1を例えば鋼管(
STKM13A)よりなるシャフト部材2の外周に嵌合
する。この場合、カムロブ1の内径は予熱による膨脹の
ためシャフト部材2の外径より若干径大になっているの
で、カムロブ1はシャフト部材2にスムーズに嵌合され
る。なお、例えば450℃程度に予熱されたカムロブ1
の温度は嵌合後に350℃程度に低下している。Next, as shown in FIG. 2, the cam lobe 1 is attached to a steel pipe (
It fits onto the outer periphery of the shaft member 2 made of STKM13A). In this case, since the inner diameter of the cam lobe 1 is slightly larger than the outer diameter of the shaft member 2 due to expansion due to preheating, the cam lobe 1 is smoothly fitted into the shaft member 2. In addition, for example, the cam lobe 1 is preheated to about 450°C.
The temperature drops to about 350°C after fitting.
次に、カムロブ1が高温の状態、例えば200℃〜50
0℃の範囲内の温度のときに、第3図に示すように、カ
ムロブ1の両側端部12,12とシャフト部材2の外周
面とを高エネルギービーム例えばレーザビーム或いは電
子ビームにより溶接する。この場合、レーザビームで溶
接する場合には、出カニ2KWが好ましい。Next, the cam lobe 1 is in a high temperature state, for example, from 200°C to 50°C.
At a temperature within the range of 0.degree. C., as shown in FIG. 3, both end portions 12, 12 of the cam lobe 1 and the outer peripheral surface of the shaft member 2 are welded using a high energy beam, such as a laser beam or an electron beam. In this case, when welding with a laser beam, Dekani 2KW is preferable.
前記の場合、カムロブ1の温度条件を200℃〜500
℃の範囲に設定する理由は次のとおりである。すなわち
、溶接時のカムロブエの温度が200℃未満の場合には
、溶接前後の温度差が大きすぎるため溶接による焼き割
れを生じる可能性があるからであり、溶接時のカムロブ
1の温度が500℃を超える場合には、カムロブ1の酸
化によるスケールが生じ、溶接の際に該スケールの巻き
込みを起こす可能性があると共に、カムロブ1が軟化し
て硬度或いは強度の低下を生じる可能性があるからであ
る。In the above case, the temperature condition of the cam lobe 1 is set to 200°C to 500°C.
The reason for setting it in the range of ℃ is as follows. That is, if the temperature of the cam lobe 1 during welding is less than 200°C, the temperature difference before and after welding is too large, which may cause quench cracking due to welding. If the welding temperature is exceeded, scale may be generated due to oxidation of the cam lobe 1, which may become involved during welding, and the cam lobe 1 may be softened, resulting in a decrease in hardness or strength. be.
このような理由により、前記のようにカムロブ1を30
0℃〜600℃の温度に予熱すると共に、溶接時に20
0℃〜500℃の高温状態に維持すると、カムロブ1は
溶接により加熱されても急冷されないため、急激な温度
変化が避けられるので残留応力が緩和され、焼き割れ現
象は発生しない。For this reason, the cam lobe 1 is set to 30 mm as described above.
Preheat to a temperature of 0°C to 600°C, and 20°C during welding.
When maintained at a high temperature of 0° C. to 500° C., the cam lobe 1 is not rapidly cooled even when heated by welding, so a sudden temperature change is avoided, residual stress is relaxed, and quench cracking does not occur.
次に、溶接接合されたカムロブ1及びシャフト部材2を
徐冷して第4図に示すようなカムシャフトAを得る。Next, the welded cam lobe 1 and shaft member 2 are slowly cooled to obtain a camshaft A as shown in FIG. 4.
以上のようにしてカムシャフトAを得ると、予熱により
膨脹したカムロブ1は徐冷されて常温に戻る際に収縮す
るため、焼きばめ作用によりカムロブ1とシャフト部材
2との接合力が向上する。When the camshaft A is obtained as described above, the cam lobe 1 expanded by preheating is slowly cooled and contracts when returning to room temperature, so the bonding force between the cam lobe 1 and the shaft member 2 is improved by the shrink fit effect. .
(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、焼結合金よりなるカムロブは高温状態で
シャフト部材と溶接されるため、該カムロブは溶接時に
加熱されても急激な温度変化が避けられ残留応力が高く
ならないので、焼き割れを確実に防止することができる
。(Effects of the Invention) As explained above, according to the method for manufacturing a camshaft according to the present invention, the cam lobe made of a sintered alloy is welded to the shaft member in a high temperature state, so the cam lobe does not need to be heated during welding. Since sudden temperature changes are avoided and residual stress does not increase, quench cracking can be reliably prevented.
また、前記カムロブは予熱されて膨脹した後、常温に戻
る際に収縮するため、膨脂時に嵌合されたシャフト部材
を焼きばめ効果により強く把持するので接合力が向上す
る。In addition, the cam lobe is preheated and expanded, and then contracts when returning to room temperature, so that it strongly grips the fitted shaft member during expansion due to the shrink fit effect, thereby improving the bonding force.
第1図〜第4図は各々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図はカムロブの縦断面図、
第2図は該カムロブのシャフト部材への嵌合工程の縦断
面図、第3図はカムロブとシャフト部材との溶接工程の
縦断面図、第4図は徐冷工程の正面図である。
A ・・・カムシャフト
1 ・・・カムロブ
2 ・・・シャフト部材
11・・・中空部
A
・・・カムシャフト
第
図
第
図
第
図1 to 4 each show a method of manufacturing a camshaft according to an embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional view of a cam lobe;
FIG. 2 is a longitudinal sectional view of the fitting process of the cam lobe to the shaft member, FIG. 3 is a longitudinal sectional view of the welding process of the cam lobe and the shaft member, and FIG. 4 is a front view of the annealing process. A...Camshaft 1...Cam lobe 2...Shaft member 11...Hollow part A...Camshaft diagram diagram diagram diagram diagram
Claims (1)
した後、該カムロブをシャフト部材の外周に嵌合し、そ
の後、前記カムロブが高温状態にあるうちに該カムロブ
と前記シャフト部材とを高エネルギービームにより溶接
することを特徴とするカムシャフトの製造方法。(1) After preheating a cam lobe made of a sintered alloy and having a hollow part, the cam lobe is fitted onto the outer periphery of the shaft member, and then, while the cam lobe is in a high temperature state, the cam lobe and the shaft member are heated to a high temperature. A method for manufacturing a camshaft characterized by welding using an energy beam.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32660089A JPH03185202A (en) | 1989-12-15 | 1989-12-15 | Manufacture of cam shaft |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32660089A JPH03185202A (en) | 1989-12-15 | 1989-12-15 | Manufacture of cam shaft |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH03185202A true JPH03185202A (en) | 1991-08-13 |
Family
ID=18189627
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP32660089A Pending JPH03185202A (en) | 1989-12-15 | 1989-12-15 | Manufacture of cam shaft |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH03185202A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6993837B2 (en) * | 2001-03-12 | 2006-02-07 | Karl Merz | Method for assembling a camshaft |
JP2010059912A (en) * | 2008-09-05 | 2010-03-18 | Toyota Motor Corp | Assembly camshaft, cam lobe, and method for assembling assembly camshaft |
US9849241B2 (en) | 2013-04-24 | 2017-12-26 | Fresenius Kabi Deutschland Gmbh | Method of operating a control device for controlling an infusion device |
-
1989
- 1989-12-15 JP JP32660089A patent/JPH03185202A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6993837B2 (en) * | 2001-03-12 | 2006-02-07 | Karl Merz | Method for assembling a camshaft |
JP2010059912A (en) * | 2008-09-05 | 2010-03-18 | Toyota Motor Corp | Assembly camshaft, cam lobe, and method for assembling assembly camshaft |
US9849241B2 (en) | 2013-04-24 | 2017-12-26 | Fresenius Kabi Deutschland Gmbh | Method of operating a control device for controlling an infusion device |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPH05222475A (en) | Exhaust valve of diesel engine and its preparation | |
JP4304190B2 (en) | Method of joining turbine wheel and rotor shaft | |
JPH03185202A (en) | Manufacture of cam shaft | |
JPH03115587A (en) | Production of remelted cam shaft | |
JPH10193087A (en) | Manufacture of titanium-aluminum-made turbine rotor | |
JP2006297474A (en) | JOINED BODY OF Ti-Al ALLOY AND STEEL, AND JOINING METHOD | |
JPS60170585A (en) | Joining member for sintered hard alloy and steel and its production | |
JPS594934A (en) | Manufacture of piston ring | |
US5407497A (en) | Method of heat treatment for two welded-together parts of different steel alloy grades | |
JPH08298177A (en) | Spark plug | |
JPS5838602A (en) | Hot rolling roll made of composite sintered hard alloy | |
JPS58387A (en) | Production of composite roll | |
JP4538878B2 (en) | Joining method between steel and titanium | |
JPH03181654A (en) | Manufacture of cam shaft | |
JPS6415328A (en) | Diffusion heat treatment of gas turbine burner | |
JPS6037280A (en) | Joining member for sintered hard alloy and steel and its production | |
JPH108924A (en) | Manufacture of valve for large diesel engine | |
JP2849496B2 (en) | Manufacturing method of high and low pressure integrated rotor | |
JPH06192737A (en) | Method for heat-treating joined body constituted of different kinds of material | |
JPS6033847A (en) | Production of driving shaft having high torsional strength | |
JPS59125270A (en) | Poppet valve and its production | |
JPH10219353A (en) | Production of exhaust valve | |
JPH11254030A (en) | Low carbon martensitic stainless steel made welded tube and its manufacture | |
JPH0913139A (en) | Torque rod and its production | |
JP6201534B2 (en) | Steel for carburized parts |