JPH0533309B2 - - Google Patents
Info
- Publication number
- JPH0533309B2 JPH0533309B2 JP26812984A JP26812984A JPH0533309B2 JP H0533309 B2 JPH0533309 B2 JP H0533309B2 JP 26812984 A JP26812984 A JP 26812984A JP 26812984 A JP26812984 A JP 26812984A JP H0533309 B2 JPH0533309 B2 JP H0533309B2
- Authority
- JP
- Japan
- Prior art keywords
- cam
- weight
- camshaft
- cast iron
- remelted
- 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.)
- Expired - Lifetime
Links
- 229910052804 chromium Inorganic materials 0.000 claims description 7
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- 239000000463 material Substances 0.000 description 20
- 229910001018 Cast iron Inorganic materials 0.000 description 15
- 238000005260 corrosion Methods 0.000 description 13
- 230000007797 corrosion Effects 0.000 description 13
- 239000002184 metal Substances 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 11
- 239000000843 powder Substances 0.000 description 11
- 239000011248 coating agent Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000002612 dispersion medium Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Landscapes
- Gears, Cams (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Description
（産業上の利用分野）
この発明は、自動車用内燃機関の動弁機構部品
として使用されるカムシヤフトに関するものであ
る。
（従来の技術）
自動車用内燃機関の動弁機構部品として使用さ
れるカムシヤフトには、例えば第１図に示すよう
な形状のものがある。すなわち、このカムシヤフ
ト１は、気筒数に応じた個数のカム部２，２と、
ジヤーナル部３，３とをシヤフト部４の所定位置
に設けたものであり、なかには、カム部２（およ
びジヤーナル部３）を別体で形成してシヤフト部
４と結合したものや、シヤフト部４を中空状にし
たものなどがある。このようなカムシヤフト１に
おいて、カム部２の素材として従来より鋳鉄を用
いることがほとんどであり、近年においては焼結
合金やセラミツクスを用いることも検討されてい
る。
ところで、カム部２の素材として鋳鉄を用いる
場合には、その表面をチル化してカム面の耐摩耗
性を向上させるようにするのが普通であり、鋳造
時に冷し金を用いて表面をチル硬化させることも
よく行われている。一方、カム面をチル硬化させ
る他の方法として、当該カム面を高密度エネルギ
ー源により再溶融してチル化することも知られて
いる（特開昭54−57010号公報に開示）。
しかしながら、このような従来のカムシヤフト
にあつては、カム部２の素材（多くはシヤフト部
４と一体化）として一般的な鋳鉄を使用してお
り、とくに硫酸（H2SO4）による腐食環境下で
の使用を考慮したものとはなつていないため、デ
イーゼルエンジンのように、燃料中のＳが燃焼時
にSOxに変化し、しかも同時に生成されるH2O
と反応してH2SO4が形成されるような環境下で
使用すると、カムノーズ付近に異常摩耗が発生す
ることがあるという問題点があつた。また、カム
部２を含むカムシヤフト１の材質をニレジスト鋳
鉄のような高Ni鋳鉄とした場合には、耐H2SO4
の腐食性は優れているものの、再溶融によるカム
面のチル化が不可能であり、そのほか高Cr鋳鉄
を用いた場合には、優れた耐H2SO4腐食性およ
び耐摩耗性を有するものの靭性が劣るという問題
点があつた。
（発明の目的）
この発明は、このような従来の問題点に着目し
てなされたもので、高密度エネルギー源を用いた
再溶融によるカム面のチル化が可能であると共
に、とくに硫酸（H2SO4）による腐食環境下で
の耐食性および耐摩耗性にも著しく優れたカムシ
ヤフトを提供することを目的としている。
（発明の構成）
この発明によるカムシヤフトは、摺動面に高密
度エネルギー源による再溶融チル層を有し、前記
再溶融チル層中のCrおよびNiの含有量が、Cr＞
0.5重量％でかつ２重量％＜Cr＋Ni＜９重量％で
あることを特徴としている。
この発明によるカムシヤフトは、第１図に例示
した形状において、カム部２とシヤフト部４とを
一体で形成したもの、および別体で形成したもの
の両方が含まれる。そして、例えば別体で形成し
たものの中には、上記再溶融チル層を有するカム
部２と中空状のシヤフト部４とを例えばバルジ加
工やろう付等によつて一体化したものなども含ま
れるものであり、いずれにしてもカムシヤフト１
の摺動面に高密度エネルギー源による再溶融チル
層を有し、前記再溶融チル層中のCrおよびNiの
含有量が、Cr＞0.5重量％でかつ２重量％＜Cr＋
Ni＜９重量％の範囲であれば、その他の形状お
よび構造は特に限定されないものである。
このような構造のカムシヤフトを製造する一実
施態様を示すと、例えば鋳鉄性カムシヤフトのカ
ム部の表面に、CrまたはNiのうち少なくとも一
方の元素を含む塗布剤を塗布した後、高密度エネ
ルギー源により再溶融処理して、前記カム部の表
面に形成される再溶融チル層中に、Crおよび／
またはNiをCr＞0.5重量％でかつ２重量％＜Cr＋
Ni＜９重量％の範囲で合金化させるようにする。
本発明者は、この発明によるカムシヤフトを開
発する過程において、種々の実験を行つたが、そ
のうちの実験例を以下に示す。
まず、第２図に示すように平板形をなしかつ第
２表の最下段のカム素材の欄に示す化学組成の鋳
鉄製平板１１の表面に、同じく第２図に示すよう
に、CrおよびNiのうちの少なくとも一方の元素
を含む塗布剤１２を塗布した後、レーザ光２１を
照射することによつて、前記Crおよび／または
Niを合金化した最溶融層１３を形成させた。こ
こで、塗布剤１２としては、アクリル樹脂20重量
部をクロロホルム（CHCl3）80重量部に溶解させ
た分散媒に金属粉末を分散させた（分散媒と金属
粉末との重量比は１：２）ものであり、前記金属
粉末の化学組成および塗布密度（供試材表面の単
位面積に塗布された前記金属粉末の重量）を第１
表に示す。
(Industrial Application Field) The present invention relates to a camshaft used as a valve train component of an internal combustion engine for an automobile. (Prior Art) Some camshafts used as valve train components of internal combustion engines for automobiles have a shape as shown in FIG. 1, for example. That is, this camshaft 1 includes cam portions 2, the number of which corresponds to the number of cylinders,
In some cases, the cam part 2 (and the journal part 3) is formed separately and combined with the shaft part 4, and in some cases, the cam part 2 (and the journal part 3) is formed separately and combined with the shaft part 4. There are some that have a hollow shape. In such a camshaft 1, cast iron has conventionally been used as the material for the cam portion 2 in most cases, but in recent years, the use of sintered alloys or ceramics has also been considered. By the way, when cast iron is used as the material for the cam part 2, it is common to chill the surface to improve the wear resistance of the cam surface. Curing is also common practice. On the other hand, as another method for chill-hardening the cam surface, it is also known to chill the cam surface by re-melting it with a high-density energy source (disclosed in Japanese Patent Application Laid-open No. 57010/1983). However, in such conventional camshafts, general cast iron is used as the material for the cam part 2 (often integrated with the shaft part 4), and it is particularly susceptible to corrosive environments caused by sulfuric acid (H 2 SO 4 ). Because it has not been designed with consideration for use under
There was a problem in that when used in an environment where H 2 SO 4 was formed by reaction with the cam, abnormal wear could occur near the cam nose. In addition, when the material of the camshaft 1 including the cam part 2 is high Ni cast iron such as Niresist cast iron, it has high resistance to H 2 SO 4
Although it has excellent corrosion resistance, it is impossible to chill the cam surface by remelting, and when high Cr cast iron is used, it has excellent H 2 SO 4 corrosion resistance and wear resistance. There was a problem with poor toughness. (Object of the Invention) The present invention was made by focusing on such conventional problems, and it is possible to chill the cam surface by remelting using a high-density energy source, and in particular, it is possible to chill the cam surface by remelting it using a high-density energy source. The purpose of this product is to provide a camshaft that has excellent corrosion resistance and wear resistance in a corrosive environment caused by 2 SO 4 ). (Structure of the Invention) The camshaft according to the present invention has a re-melted chill layer formed by a high-density energy source on the sliding surface, and the content of Cr and Ni in the re-melted chill layer is Cr>
0.5% by weight and 2% by weight<Cr+Ni<9% by weight. The camshaft according to the present invention includes both those in which the cam part 2 and the shaft part 4 are integrally formed and those in which the cam part 2 and the shaft part 4 are formed separately in the shape illustrated in FIG. For example, the cam part 2 having the remelted chilled layer and the hollow shaft part 4 may be integrated by bulge processing, brazing, etc., among those formed separately. In any case, the camshaft 1
has a re-melted chilled layer formed by a high-density energy source on the sliding surface, and the content of Cr and Ni in the re-melted chilled layer is Cr>0.5% by weight and 2% by weight<Cr+
Other shapes and structures are not particularly limited as long as Ni<9% by weight. In one embodiment of manufacturing a camshaft having such a structure, for example, a coating agent containing at least one of Cr and Ni is applied to the surface of the cam part of a cast iron camshaft, and then a high-density energy source is used to coat the surface of the cam part of a cast iron camshaft. Cr and/or
Or Ni with Cr>0.5wt% and 2wt%<Cr+
Alloying is performed in a range of Ni<9% by weight. The present inventor conducted various experiments in the process of developing the camshaft according to the present invention, and examples of the experiments are shown below. First, as shown in FIG. 2, a cast iron flat plate 11 having a flat plate shape and having the chemical composition shown in the column of cam material at the bottom of Table 2 was coated with Cr and Ni. After applying the coating agent 12 containing at least one of the elements, the Cr and/or
The most molten layer 13 alloyed with Ni was formed. Here, as coating agent 12, metal powder was dispersed in a dispersion medium in which 20 parts by weight of acrylic resin was dissolved in 80 parts by weight of chloroform (CHCl 3 ) (the weight ratio of dispersion medium and metal powder was 1:2). ), and the chemical composition and application density (the weight of the metal powder applied to a unit area of the surface of the sample material) of the metal powder are
Shown in the table.
【表】
＊ 供試材表面の単位面積に塗布され
た金属粉末の重量
また、レーザ照射は、同じく第２図に示すよう
に、レンズ２２によりビーム径を１mmに集光した
パワー5KWのレーザ光２１を、供試材すなわち
鋳鉄製平板１１の送り方向（Ｘ方向）と直交する
方向（Ｙ方向）に振幅15mm、振動数100Hzでオシ
レートさせながら行つた。なお、第２図におい
て、２１ａ，２１ｂ，２１ｃはレーザ光２１の光
軸であり、特に２１ｂ，２１ｃはオシレートの両
端における光軸である。ここで、供試材の送り速
度は、第１表のＡ〜Ｆの１〜３については、30
cm／分、Ｄ−31、Ｅ−31、Ｆ−31については45
cm／分、Ｄ−32、Ｅ−32、Ｆ−32については60
cm／分である。また、第３図に示すように、アシ
ストガス３１としてはArを使用し、ノズル３２
の開口部３２ａの寸法を20mm×１mmとし、流量を
150／分として行つた。
次に、前述の方法で得られた最溶融層１３を有
する供試材としての鋳鉄製平板１１から、第４図
に示すような腐食試験片１４を切り出した。な
お、前記試験片１４の再溶融層１３を含む面につ
いては、0.15mm研磨して平面とし、他の５面につ
いてはCrめつきを施した。
次に評価結果について説明する。
第２表に前述の方法で得られた再溶融層１３の
化学分析結果および深さを示す。なお、カム素材
およびCr、Niを合金化せずに得た再溶融層につ
いても併せて示す。
また、第３表には、腐食試験結果および再溶融
層の硬さを示す。ここで腐食試験は、上記腐食試
験片１４を1N・H2SO4水溶液中に2hr浸漬し、そ
の際の腐食減量（再溶融処理面の単位面積当りの
腐食減量）を測定することにより行つた。[Table] *Weight of metal powder applied to a unit area of the surface of the sample material Also, as shown in Figure 2, the laser irradiation was performed using a laser beam with a power of 5KW focused by a lens 22 to a beam diameter of 1mm. 21 was carried out while oscillating at an amplitude of 15 mm and a frequency of 100 Hz in the direction (Y direction) perpendicular to the feeding direction (X direction) of the test material, that is, the cast iron flat plate 11. In FIG. 2, 21a, 21b, and 21c are the optical axes of the laser beam 21, and in particular, 21b and 21c are the optical axes at both ends of the oscillation. Here, the feeding speed of the sample material is 30 for 1 to 3 of A to F in Table 1.
cm/min, 45 for D-31, E-31, F-31
cm/min, 60 for D-32, E-32, F-32
cm/min. Further, as shown in FIG. 3, Ar is used as the assist gas 31, and the nozzle 32
The dimensions of the opening 32a are 20 mm x 1 mm, and the flow rate is
I went at 150/min. Next, a corrosion test piece 14 as shown in FIG. 4 was cut out from the cast iron flat plate 11 as a test material having the most molten layer 13 obtained by the method described above. The surface of the test piece 14 containing the remelted layer 13 was polished to a flat surface by 0.15 mm, and the other five surfaces were plated with Cr. Next, the evaluation results will be explained. Table 2 shows the chemical analysis results and depth of the remelted layer 13 obtained by the above method. The cam material and the remelted layer obtained without alloying Cr and Ni are also shown. Table 3 also shows the corrosion test results and the hardness of the remelted layer. The corrosion test was performed by immersing the corrosion test piece 14 in a 1N H 2 SO 4 aqueous solution for 2 hours and measuring the corrosion loss (corrosion loss per unit area of the remelted surface). .
【表】【table】
【表】
＊ カム素材に再溶融処理のみを施したもの
[Table] * Cam material subjected only to remelting treatment
【表】【table】
【表】
＊ 再溶融処理面の単位面積当
りの腐食減量
上記各表に示す結果から以下のことが解る。す
なわち、腐食減量が２mg／cm2以下となるのは、
Cr＞0.5重量％でかつCr＋Ni＞２重量％の場合で
ある。しかし、Cr＞0.5重量％でかつCr＋Ni＞９
重量％では腐食減量の低減効果が飽和するのに加
え、コストも増加する。また、Ni＞９重量％で
は再溶融層の硬さも低下する。
実施例１〜７ 比較例１〜４
まず、第５図に示すような概略だ円形状をなし
かつ第２表の最下段のカム素材の欄に示す化学組
成の鋳鉄製カム素材４１を用意し、このカム素材
４１のカム面に、同じく第５図に示すように、
CrおよびNiのうちの少なくとも一方の元素を含
む塗布剤４２を塗布した後、カム素材４１をカム
シヤフトの軸を中心として回転させながら、レー
ザ光２１をオシレートさせつつ照射してカム面に
Crおよび／またはNiを合金化した再溶融チル層
４３を得た。
ここで、塗布剤４２としては、前記した実験例
の場合と同様に、アクリル樹脂20重量部をクロロ
ホルム（CHCl3）80重量部に溶解させた分散媒に
金属粉末を分散させた（分散媒と金属粉末との重
量比は１：２）ものであり、前記金属粉末の化学
組成および塗布密度は、前記実施例の結果に基い
て第４表のとおりとした。[Table] * Corrosion loss per unit area of remelted surface The following can be understood from the results shown in the above tables. In other words, corrosion loss of 2 mg/cm 2 or less is due to
This is the case when Cr>0.5% by weight and Cr+Ni>2% by weight. However, when Cr>0.5% by weight and Cr+Ni>9
At weight%, not only the corrosion weight reduction effect reaches saturation, but also the cost increases. Further, when Ni>9% by weight, the hardness of the remelted layer also decreases. Examples 1 to 7 Comparative Examples 1 to 4 First, a cast iron cam material 41 having a roughly elliptical shape as shown in FIG. 5 and having a chemical composition shown in the cam material column at the bottom of Table 2 was prepared. , on the cam surface of this cam material 41, as shown in FIG.
After applying the coating material 42 containing at least one of Cr and Ni, the cam material 41 is rotated about the axis of the camshaft while the laser beam 21 is oscillated and irradiated onto the cam surface.
A remelted chilled layer 43 alloyed with Cr and/or Ni was obtained. Here, as the coating agent 42, metal powder was dispersed in a dispersion medium in which 20 parts by weight of acrylic resin was dissolved in 80 parts by weight of chloroform (CHCl 3 ) (as in the case of the above-mentioned experimental example). The weight ratio with the metal powder was 1:2), and the chemical composition and coating density of the metal powder were as shown in Table 4 based on the results of the examples.
【表】
の重量
また、レーザ照射条件は、前記実施例の場合と
同様であり、カム面の周速は、30cm／分となるよ
うにした。
続いて、前述の方法で得られたカム（シヤフ
ト）を仕上げ加工し、排気量2000c.c.の直列６気筒
エンジンに組込み、カムおよび相手材であるロツ
カアームチツプの摩耗量を調べた。この際の実験
条件は、エンジン回転数650rpm、運転時間400hr
であり、ロツカアームチツプの材質はMX300（化
学組成；C2.2％、Si＜0.4％、Mn＜0.4％、Cr15.9
％、Mo3.9％（単位は重量％）、残部Fe）とした。
第５表にこの際のカムおよびロツカアームチツプ
の摩耗量の測定結果を示す。[Table] Weight The laser irradiation conditions were the same as in the above example, and the peripheral speed of the cam surface was set to 30 cm/min. Subsequently, the cam (shaft) obtained by the above-mentioned method was finished and assembled into an in-line six-cylinder engine with a displacement of 2000 c.c., and the amount of wear on the cam and the mating rocker arm chip was examined. The experimental conditions at this time were engine rotation speed 650 rpm and operating time 400 hours.
The material of the Rotsuka arm chip is MX300 (chemical composition; C2.2%, Si<0.4%, Mn<0.4%, Cr15.9
%, Mo3.9% (unit: weight %), balance Fe).
Table 5 shows the measurement results of the amount of wear on the cam and rocker arm tip at this time.
【表】
上記表に示す結果から判るように、前述の実験
例から推定して、Cr＋Ni＞２重量％の組成を有
すると考えられる再溶融チル層１３を有するカム
の摩耗量は、Cr＋Ni＜２重量％の場合よりもは
るかに少なく、カム素材４１に再溶融処理のみを
施した比較例１の場合、およびCr＋Ni量が少な
すぎる比較例２、３、４の場合にはいずれもカム
および相手材であるロツカアームチツプの摩耗量
が多い結果となつた。
（発明の効果）
以上説明してきたように、この発明によるカム
シヤフトは、摺動面に高密度エネルギー源による
再溶融チル層を有し、前記再溶融チル層中のCr
およびNiの含有量が、Cr＞0.5重量％でかつ２重
量％＜Cr＋Ni＜９重量％となるようにしたもの
であるから、とくにカム面の硫酸（H2SO4）腐
食環境下での耐食性および耐摩耗性が著しく向上
し、前記カムシヤフトをデイーゼルエンジンの動
弁機構部品としても使用することが十分に可能で
あるという効果が得られる。さらに、表面の再溶
融チル層のみにCrおよび／またはNiを合金化す
るだけであるので、(1)Crおよび／またはNiの添
加量が少なくてすみ、カムシヤフト素材の組成を
高Cr化、高Ni化するよりもはるかに安価である
こと、(2)カムシヤフト全体としての靭性を低下さ
せないこと、などの優れた効果も得られる。[Table] As can be seen from the results shown in the table above, the wear amount of the cam having the remelted chilled layer 13, which is considered to have a composition of Cr+Ni>2% by weight, is estimated from the above-mentioned experimental example. In the case of Comparative Example 1, in which the cam material 41 was only subjected to remelting treatment, and in the case of Comparative Examples 2, 3, and 4, in which the amount of Cr+Ni was too small, both the cam and the mating material This resulted in a large amount of wear on the rock arm tip. (Effects of the Invention) As explained above, the camshaft according to the present invention has a remelted chilled layer on the sliding surface by a high-density energy source, and the Cr in the remelted chilled layer.
The content of Ni is Cr > 0.5% by weight and 2% by weight < Cr + Ni < 9% by weight, so it has excellent corrosion resistance in a sulfuric acid (H 2 SO 4 ) corrosive environment on the cam surface. Furthermore, the wear resistance is significantly improved, and the camshaft can be used as a valve train component of a diesel engine. Furthermore, since Cr and/or Ni are only alloyed in the remelted chill layer on the surface, (1) the amount of Cr and/or Ni added can be reduced, and the composition of the camshaft material can be made to have a high Cr content or a high It also has excellent effects such as being much cheaper than Ni conversion and (2) not reducing the toughness of the camshaft as a whole.
第１図はカムシヤフトの形状例を示す斜面図、
第２図はこの発明の実験例において鋳鉄製平板の
表面に金属粉末を塗布してレーザ光を照射させた
状況を示す説明図、第３図は第２図に示すレーザ
光の照射面にアシストガスを供給する要領を示す
説明図、第４図はレーザ光照射後の鋳鉄製平板か
ら切り出した腐食供試片の斜視図、第５図はこの
発明の実施例および比較例において鋳鉄製カム素
材の表面に金属粉末を塗布してレーザ光を照射さ
せた状況を示す説明図である。
１……カムシヤフト、２……カム部、３……ジ
ヤーナル部、４……シヤフト部、２１……レーザ
光（高密度エネルギー源）、４１……カム素材、
４２……金属粉末の塗布剤、４３……再溶融チル
層。
Figure 1 is a perspective view showing an example of the shape of a camshaft.
Figure 2 is an explanatory diagram showing a situation in which metal powder was applied to the surface of a cast iron flat plate and irradiated with laser light in an experimental example of the present invention, and Figure 3 is an illustration of an assisted surface irradiated with laser light shown in Figure 2. An explanatory diagram showing the procedure for supplying gas, Fig. 4 is a perspective view of a corroded specimen cut out from a cast iron flat plate after laser beam irradiation, and Fig. 5 shows a cast iron cam material in an example of the present invention and a comparative example. FIG. 3 is an explanatory diagram showing a situation in which metal powder is applied to the surface of the substrate and laser light is irradiated on the surface of the substrate. DESCRIPTION OF SYMBOLS 1... Camshaft, 2... Cam part, 3... Journal part, 4... Shaft part, 21... Laser light (high density energy source), 41... Cam material,
42...Metal powder coating agent, 43...Remelted chill layer.
Claims (1)
ル層を有し、前記再溶融チル層中のCrおよびNi
の含有量が、Cr＞0.5重量％でかつ２重量％＜Cr
＋Ni＜９重量％であることを特徴とするカムシ
ヤフト。1 The sliding surface has a re-melted chill layer formed by a high-density energy source, and Cr and Ni in the re-melted chill layer
The content of Cr > 0.5% by weight and 2% by weight < Cr
A camshaft characterized in that +Ni<9% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26812984A JPS61147843A (en) | 1984-12-18 | 1984-12-18 | Cam shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26812984A JPS61147843A (en) | 1984-12-18 | 1984-12-18 | Cam shaft |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61147843A JPS61147843A (en) | 1986-07-05 |
| JPH0533309B2 true JPH0533309B2 (en) | 1993-05-19 |
Family
ID=17454283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26812984A Granted JPS61147843A (en) | 1984-12-18 | 1984-12-18 | Cam shaft |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61147843A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103276283B (en) * | 2013-06-28 | 2015-07-29 | 南通利元亨机械有限公司 | A kind of anticorrosion antiwear pipeline of conveying mineral |
| CN103521924B (en) * | 2013-10-16 | 2015-08-05 | 江苏大学 | A kind of cam shaft surface laser processing method |
-
1984
- 1984-12-18 JP JP26812984A patent/JPS61147843A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61147843A (en) | 1986-07-05 |
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