JP2932652B2 - Manufacturing method of wear-resistant parts - Google Patents
Manufacturing method of wear-resistant partsInfo
- Publication number
- JP2932652B2 JP2932652B2 JP25173890A JP25173890A JP2932652B2 JP 2932652 B2 JP2932652 B2 JP 2932652B2 JP 25173890 A JP25173890 A JP 25173890A JP 25173890 A JP25173890 A JP 25173890A JP 2932652 B2 JP2932652 B2 JP 2932652B2
- Authority
- JP
- Japan
- Prior art keywords
- wear
- resistant
- powder
- valve
- reinforcing material
- 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 - Fee Related
Links
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- Powder Metallurgy (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、バルブやバルブシートなどの耐摩耗部品の
製造方法に関する。Description: TECHNICAL FIELD The present invention relates to a method for manufacturing wear-resistant parts such as valves and valve seats.
［従来の技術］ エンジンの高出力化に伴い、バルブとバルブシートの
当り面の耐摩耗性の向上が望まれ、又近年、地球温暖化
の主因と考えられているCO2問題への対応としてガソリ
ン，軽油などの化石燃料からメタノールなどのアルコー
ル燃料が注目されてきている。このアルコール燃料を従
来のエンジンに採用した場合、特にバルブとバルブの当
り面の摩耗が促進されるようになる。これらの当り面の
耐エロージョン、耐吹抜け性はもとより耐摩耗性を向上
させるため、現在Co系の耐摩耗金属（ステライト合金）
の肉盛りが実施されている（実開昭62−122206号）。[Prior art] With the increase in engine output, it is desired to improve the abrasion resistance of the contact surface between the valve and the valve seat. In response to the CO 2 problem which is considered to be the main cause of global warming in recent years, From fossil fuels such as gasoline and light oil, alcohol fuels such as methanol are attracting attention. When this alcohol fuel is used in a conventional engine, in particular, wear of the valve and the contact surface of the valve is promoted. In order to improve the erosion resistance and blow-through resistance of these contact surfaces, as well as the wear resistance, a Co-based wear-resistant metal (Stellite alloy) is currently used.
(Japanese Utility Model No. 62-122206).
この肉盛り方法としては、ガス溶接、及び歩留りを改
良した粉体でのプラズマ溶接が一般的になされている。As a method of this overlaying, gas welding and plasma welding with powder having improved yield are generally performed.
［発明が解決しようとする課題］ しかし、耐摩耗性をより向上させる目的でCo（コバル
ト）,Co合金粉末にAl2O3,SiC等のセラミック粒子を混合
し、プラズマ溶接肉盛りを行う場合、Co及びCo合金粉末
とセラミック粒子とが比重、粒子形状が異なるために、
その混合が均一になりにくく、最新の混練機にて長時間
混練しても均一な混練が得られない、Co,Co合金粉末と
セラミック粒子が均一に混練されていなく偏析を生じて
いる場合、肉盛り後の切削加工時の工具の欠け及びエン
ジン運転中のセラミック粒子の欠けにより脱落が生じて
しまうなどという不具合を生じる。[Problem to be Solved by the Invention] However, in the case where ceramic particles such as Al 2 O 3 and SiC are mixed with Co (cobalt) or Co alloy powder for the purpose of further improving wear resistance, and plasma welding is performed. , Co and Co alloy powder and ceramic particles are different in specific gravity, particle shape,
The mixing is difficult to be uniform, even kneading for a long time with the latest kneading machine can not obtain uniform kneading, Co, Co alloy powder and ceramic particles are not uniformly kneaded and segregation occurs, Problems such as chipping during cutting after the build-up and chipping of the ceramic particles during operation of the engine may occur.
本発明はこのCo,Co合金等の耐摩耗金属内に均一にセ
ラミック粒子を分散させて、耐摩耗性を向上させ上記不
具合を解消することを目的としている。It is an object of the present invention to uniformly disperse ceramic particles in a wear-resistant metal such as Co and Co alloys to improve wear resistance and eliminate the above-mentioned problems.
［課題を解決するための手段］ 上記目的を達成するために、本発明は強化材の表面に
耐摩耗金属の粉体を被覆固定してカプセル状の耐摩耗材
を形成した後、これをバルブやバルブシートなどの摩耗
強化部に融接等により肉盛りしたものである。Means for Solving the Problems In order to achieve the above object, the present invention provides a capsule-shaped wear-resistant material by coating and fixing a wear-resistant metal powder on the surface of a reinforcing material, and then forming the capsule-shaped wear-resistant material. This is a welded-up portion of a wear-enhanced portion such as a valve seat, which is welded.
［作用］ 強化材の表面にコバルト系粉体等の耐摩耗金属の粉体
を被覆固定してカプセル状の耐摩耗材を形成すること
は、強化材に対する耐摩耗金属の粉体のVf値（体積比）
を一定とすることができ、その肉盛りした摩耗強化部に
強化材を均一に拡散させることができる。[Action] Forming a capsule-shaped wear-resistant material by coating and fixing a wear-resistant metal powder such as a cobalt-based powder on the surface of the reinforcement material is equivalent to the Vf value (volume) of the wear-resistant metal powder against the reinforcement material. ratio)
Can be made constant, and the reinforcing material can be uniformly diffused into the overlaid abrasion-enhancing portion.
［実施例］ 以下、本発明の一実施例を添付図面に基づいて詳述す
る。Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
第１図において、１は弁傘部側をオーステナイト系耐
熱鋼で、弁軸をマルテンサイト系耐熱鋼で、そして弁軸
端側をオーステナイトまたはマルテンサイト系耐熱鋼で
形成した溶接バルブである。このバルブの当り面1aを局
部的に強化するために、先ず第１工程としてバルブ１の
指定された当り面1aに形成した凹部３に耐摩耗材４を一
体化し、バルブの凹部３に耐摩耗部５を形成する。耐摩
耗材４は、第４図に示す如く例えばAl2O3,Si3N4,SiCな
どの酸化物、窒化物、炭化物を強化材6aとしてこれを、
Co（コバルト）及びCo（コバルト）合金粉体７等の耐摩
耗金属の粉体でカプセル状に被覆して形成されるもの
で、強化材6aはセラミック（Al2O3,Si3N4,SiC等）を、C
o及びCo合金粉体７は、Co及びCo合金を、それぞれ粉砕
原料とし、微粉体粉砕機によりそれぞれ粉砕して形成す
る。以下，強化材6aをAl2O3に特定して説明する。In FIG. 1, reference numeral 1 denotes a welded valve in which the valve head is formed of austenitic heat-resistant steel, the valve shaft is formed of martensitic heat-resistant steel, and the valve shaft end is formed of austenitic or martensitic heat-resistant steel. In order to locally reinforce the contact surface 1a of the valve, first, as a first step, a wear-resistant material 4 is integrated with a concave portion 3 formed on a designated contact surface 1a of the valve 1, and a wear-resistant portion is formed on the concave portion 3 of the valve. 5 is formed. As shown in FIG. 4, the wear-resistant material 4 is made of an oxide, nitride, or carbide such as Al 2 O 3 , Si 3 N 4 , SiC or the like as a reinforcing material 6a.
It is formed by coating capsule-like with wear-resistant metal powder such as Co (cobalt) and Co (cobalt) alloy powder 7, and the reinforcing material 6a is made of ceramic (Al 2 O 3 , Si 3 N 4 , SiC etc.), C
The o and Co alloy powders 7 are formed by using Co and Co alloys as pulverizing raw materials, respectively, and pulverizing them with a fine powder pulverizer. Hereinafter, the reinforcing material 6a will be described with reference to Al 2 O 3 .
Al2O3は、その粒径が50〜300μｍの粒径まで、Co及び
Co合金は、５〜20μｍの粒径まで粉砕する。この後、Al
2O3粉体6aのVf値（体積比）に応じて、Al2O3粉体6aとCo
及びCo合金粉体７とを配合し、これを撹拌して静電付着
によりAl2O3粉体6aの表面にCo及びCo合金粉体７をカプ
セル状に付着させて耐摩耗材４を形成する。そして、こ
の後、撹拌機を用いAl2O3粉体6aの表面にCo及びCo合金
粉体７を固定する。撹拌機としては、ハウジング内に回
転翼を有し、ハウジング内面に沿って耐摩耗材４を遠心
転動させるように構成したものを用いる。すなわち撹拌
機によって耐摩耗材４を1000〜7000rpmの範囲で遠心転
動させてAl2O3粉体6aとCo及びCo合金粉体７の接合面に
適度な摩擦熱を発生させると同時に、衝撃打撃力によっ
て、Co及びCo合金粉体７をAl2O3粉体6aの表面に対して
面方向に沿うように引伸ばす。この摩擦熱及び衝撃打撃
力により第５図に示すようにAl2O3粉体6aの表面にCo及
びCo合金粉体７が引伸ばされて固定され耐摩耗材料とし
て完全な形態の耐摩耗材４が得られる。なお撹拌機には
（株）奈良機械製造のハイブリダイゼーション装置があ
る。また、他の耐摩耗金属材料としては、SUS系,SUH系
の合金がある。Al 2 O 3 has a particle size of 50 to 300 μm, Co and
The Co alloy is ground to a particle size of 5-20 μm. After this, Al
Depending on the Vf value of the 2 O 3 powder 6a (volume ratio), Al 2 O 3 powder 6a and Co
And the Co alloy powder 7 are mixed, the mixture is stirred, and the Co and Co alloy powder 7 is adhered in the form of a capsule to the surface of the Al 2 O 3 powder 6a by electrostatic adhesion to form the wear-resistant material 4. . After that, the Co and Co alloy powder 7 is fixed on the surface of the Al 2 O 3 powder 6a using a stirrer. As the agitator, a stirrer having a rotating blade in the housing and configured to centrifugally roll the wear-resistant material 4 along the inner surface of the housing is used. That is, the abrasion-resistant material 4 is centrifugally rolled in the range of 1000 to 7000 rpm by a stirrer to generate appropriate frictional heat on the joint surface between the Al 2 O 3 powder 6a and the Co and Co alloy powder 7, and at the same time, impact impact By force, the Co and Co alloy powder 7 is stretched along the surface direction with respect to the surface of the Al 2 O 3 powder 6a. By this frictional heat and impact impact force, the Co and Co alloy powder 7 is stretched and fixed on the surface of the Al 2 O 3 powder 6a as shown in FIG. Is obtained. The stirrer includes a hybridization device manufactured by Nara Machinery Co., Ltd. Other wear-resistant metal materials include SUS-based and SUH-based alloys.
凹部３に対する耐摩耗材の肉盛りは、下記〜の方
法のいずれかによって行う。The build-up of the wear-resistant material on the concave portion 3 is performed by any of the following methods.
プラズマ溶接機により凹部３に耐摩耗材４を肉盛りす
る。（第１図）。The wear resistant material 4 is built up in the recess 3 by a plasma welding machine. (FIG. 1).
凹部３に上記耐摩耗材を圧粉圧着後、圧着部を高周波
コイルで加熱溶融させる（第２図）。After the above-mentioned abrasion-resistant material is pressed into the concave portion 3 by powder compaction, the pressed portion is heated and melted by a high-frequency coil (FIG. 2).
凹部３に上記耐摩耗材を圧粉圧着後、圧着部を、プラ
ズマ焼結法、通電焼結法によって固体化し密着させる
（第３図）。After the above-mentioned wear-resistant material is pressed into the concave portion 3 by powder compaction, the pressed portion is solidified by plasma sintering or current-carrying sintering and adhered (FIG. 3).
通電焼結法は、シリンダ状の筒体に上型，下型の少な
くともいずれか一方を加圧方向に移動自在に設け、これ
ら型に極性の異なる電極を取付けて通電により焼結する
焼結法であり、プラズマ焼結法は、プラズマ・タングス
テン・アーク法（PTA）と称され、プラズマトランスフ
ァーの熱を利用した溶接法で非加工部部材（母材，＋）
とタングステン電極（−）との発生させたプラズマアー
ク中に溶加材（上記耐摩耗材４）を投入しこれを溶融さ
せて被加工物表面（凹部３表面）に溶着させる方法であ
る。The electric sintering method is a sintering method in which at least one of an upper mold and a lower mold is movably provided in a cylinder-shaped cylindrical body in a pressing direction, electrodes having different polarities are attached to these molds, and sintering is performed by energization. The plasma sintering method is called the plasma tungsten arc method (PTA), which is a non-processed member (base material, +) by a welding method using the heat of plasma transfer.
In this method, a filler material (the above-mentioned wear-resistant material 4) is charged into the plasma arc generated by the metal and the tungsten electrode (-), and is melted to be welded to the surface of the workpiece (the surface of the concave portion 3).
このように酸化物、窒化物、炭化物（Al2O3,Si3N4,Si
Cなど）を強化材6aとしてその表面をCo及びCo合金粉体
７でカプセル状に被覆し、この被覆粉体を耐摩耗材４の
原料とすると、従来に対して強化材6aのVf値の増減調節
が自在となり、肉盛り、焼結において強化材6aが偏析な
く凹部３に均一に分散された安定な耐摩耗部５が形成さ
れるようになる。Thus, oxides, nitrides, carbides (Al 2 O 3 , Si 3 N 4 , Si
C or the like as a reinforcing material 6a, the surface of which is coated in a capsule shape with Co and a Co alloy powder 7 and this coated powder is used as a raw material of the wear-resistant material 4. Adjustment becomes free, and a stable wear-resistant portion 5 in which the reinforcing material 6a is uniformly dispersed in the concave portion 3 without segregation in the build-up and sintering is formed.
なお上記強化材として粉体を用いた説明をしたが、セ
ラミックの長・短繊維を強化材として用いこれをCo及び
Co合金でカプセル状に被覆して耐摩耗材を形成し、耐摩
耗部を強化することも当然可能である。Although the explanation has been made using powder as the reinforcing material, long and short fibers of ceramic are used as the reinforcing material,
Of course, it is also possible to form a wear-resistant material by coating in a capsule shape with a Co alloy to strengthen the wear-resistant portion.
本実施例によれば次のように効果がある。 According to the present embodiment, the following effects are obtained.
強化材6a（粉体もしくは短繊維又は長繊維）を、Co及
びCo合金粉体７で被覆して耐摩耗材４として提供でき
る。The reinforcing material 6 a (powder or short fiber or long fiber) can be provided as the wear-resistant material 4 by coating with the Co and Co alloy powder 7.
耐摩耗材４の原料段階においてCo及びCo合金粉体７と
強化材6aとの体積比の調節を完了できる。In the raw material stage of the wear-resistant material 4, the adjustment of the volume ratio between the Co and Co alloy powder 7 and the reinforcing material 6a can be completed.
耐摩耗部に強化材6aを組織的に偏析なく均一に分散で
き、欠損や、切削加工時の工具の欠けを防止できる。The reinforcing material 6a can be evenly dispersed without segregation systematically in the wear-resistant portion, thereby preventing chipping or chipping of the tool during cutting.
バルブ、バルブインサート等の当り面1aなど耐摩耗性
を必要とする部分の信頼性を向上できる。The reliability of parts requiring wear resistance, such as the contact surface 1a of a valve or a valve insert, can be improved.
アルコール，メタノール燃料を使用するエンジンのバ
ルブ、バルブインサートを提供できる。Valves and valve inserts for engines using alcohol or methanol fuel can be provided.
なお、上記強化材として粉体を用いた説明をしたが、
セラミックの長・短繊維を強化材として用いこれをCo及
びCo合金等の耐摩耗金属でカプセル状に被覆して耐摩耗
材を形成し、耐摩耗部を強化することも当然可能であ
る。Although the description has been made using powder as the reinforcing material,
Naturally, it is also possible to form a wear-resistant material by using ceramic long and short fibers as a reinforcing material and coat the same with a wear-resistant metal such as Co and a Co alloy to form a wear-resistant material, thereby reinforcing the wear-resistant portion.
［発明の効果］ 以上要するに本発明によれば、次の如き優れた効果を
発揮する。[Effects of the Invention] In summary, according to the present invention, the following excellent effects are exhibited.
（１）耐摩耗部に強化材を組織的に偏析なく均一に分散
でき、欠損や、切削加工時の工具の欠けを防止できる。(1) The reinforcing material can be evenly dispersed without segregation systematically in the abrasion-resistant portion, thereby preventing chipping or chipping of the tool during cutting.
（２）Co,Co合金等の耐摩耗金属内に強化材を均一に分
散させるようにしたので、安定した耐摩耗性が得られる
と共に、耐摩耗部の欠損や、切削加工時の工具の欠けを
防止できる。(2) Since the reinforcing material is evenly dispersed in wear-resistant metal such as Co, Co alloy, stable wear resistance can be obtained, and the wear-resistant portion is lost or the tool is chipped during cutting. Can be prevented.
第１図乃至第３図は本発明に係るバルブの強化工程を示
す断面図、第４図及び第５図はカプセル状の耐摩耗材を
示す概略図である。 図中、１はバルブ、４は耐摩耗材、6aは強化材、７は耐
摩耗金属粉体としてのCo及びCo合金粉体である。1 to 3 are cross-sectional views showing a process of strengthening a valve according to the present invention, and FIGS. 4 and 5 are schematic views showing a capsule-shaped wear-resistant material. In the figure, 1 is a valve, 4 is a wear-resistant material, 6a is a reinforcing material, and 7 is Co and a Co alloy powder as a wear-resistant metal powder.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) F01L 3/02 B23K 9/04 B22F 7/04 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 6 , DB name) F01L 3/02 B23K 9/04 B22F 7/04
Claims (1)
セル状に被覆固定して耐摩耗材を形成し、これをバルブ
やバルブシートなどの機械要素の摩耗強化部に融接等に
より肉盛りしたことを特徴とする耐摩耗部品の製造方
法。An abrasion-resistant material is formed on a surface of a reinforcement material by covering abrasion-resistant metal powder in a capsule shape and fixing the same to a wear-enhanced portion of a mechanical element such as a valve or a valve seat by fusion welding. A method for producing a wear-resistant part, characterized by being overlaid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25173890A JP2932652B2 (en) | 1990-09-25 | 1990-09-25 | Manufacturing method of wear-resistant parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25173890A JP2932652B2 (en) | 1990-09-25 | 1990-09-25 | Manufacturing method of wear-resistant parts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04132808A JPH04132808A (en) | 1992-05-07 |
| JP2932652B2 true JP2932652B2 (en) | 1999-08-09 |
Family
ID=17227203
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25173890A Expired - Fee Related JP2932652B2 (en) | 1990-09-25 | 1990-09-25 | Manufacturing method of wear-resistant parts |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2932652B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103639569A (en) * | 2013-11-13 | 2014-03-19 | 程永科 | Method for improving wear resistance of wear-resistant part of extruding machine |
| WO2021059501A1 (en) * | 2019-09-27 | 2021-04-01 | 株式会社日本製鋼所 | Method for manufacturing metal member |
-
1990
- 1990-09-25 JP JP25173890A patent/JP2932652B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04132808A (en) | 1992-05-07 |
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