JPH0771314A - Manufacture of piston for internal combustion engine - Google Patents

Manufacture of piston for internal combustion engine

Info

Publication number
JPH0771314A
JPH0771314A JP8710694A JP8710694A JPH0771314A JP H0771314 A JPH0771314 A JP H0771314A JP 8710694 A JP8710694 A JP 8710694A JP 8710694 A JP8710694 A JP 8710694A JP H0771314 A JPH0771314 A JP H0771314A
Authority
JP
Japan
Prior art keywords
piston
outer peripheral
peripheral surface
aluminum
copper 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.)
Granted
Application number
JP8710694A
Other languages
Japanese (ja)
Other versions
JP2586325B2 (en
Inventor
Katsuki Nanjiyou
活己 南條
Toru Sakurada
徹 桜田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Motors Corp
Original Assignee
Mitsubishi Motors Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Motors Corp filed Critical Mitsubishi Motors Corp
Priority to JP6087106A priority Critical patent/JP2586325B2/en
Publication of JPH0771314A publication Critical patent/JPH0771314A/en
Application granted granted Critical
Publication of JP2586325B2 publication Critical patent/JP2586325B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/02—Light metals
    • F05C2201/021—Aluminium

Landscapes

  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

PURPOSE:To manufacture a piston for an internal combustion engine, which is made of aluminum alloy, and which has excellent anti-wear property, at a low cost. CONSTITUTION:In a first process for manufacturing a piston material, a step part 28 of the size larger than the outer peripheral surface of the adjacent part is formed on the outer peripheral surface on which a piston ring groove is to be formed. In a second process, a groove is provided on the step part 28 and a wire 20 made of copper or copper alloy is fitted into the groove. In a third process, the wire 20 is melted by means of a high energy beam 22 such as electron beam to form an aluminum/copper alloy structure. In a fourth process, the step part containing the alloy structure is cut to finish a uniform surface. In a fifth process, the piston ring groove is cut and formed on the part of the alloy structure.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、アルミニウム合金製の
内燃機関用ピストンの製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an aluminum alloy piston for an internal combustion engine.

【０００２】[0002]

【従来の技術】自動車等車両用の内燃機関においては、
アルミニウム合金製のピストンが広く採用されている
が、燃焼ガス圧力が高く、また燃料の関係でカーボン粒
子等パティキュレートの発生が多いディーゼルエンジン
の場合、ピストンリング溝の摩耗が比較的大きく、特に
燃焼ガス圧力を最初に受けるトップリング溝の摩耗が著
しい。そこで、上記トップリング溝の耐摩耗性を改善し
てピストンの耐久性を向上するために、トップリング溝
を形成するピストンの外周面の一部に、アルミニウム合
金母材よりも耐摩耗性が優れた合金組織を形成する方法
が検討されている。2. Description of the Related Art In an internal combustion engine for vehicles such as automobiles,
Aluminum alloy pistons are widely used, but in diesel engines where the combustion gas pressure is high and there are many particulates such as carbon particles due to the fuel, the piston ring groove wear is relatively large, especially when burning. The top ring groove that receives the gas pressure first is significantly worn. Therefore, in order to improve the wear resistance of the top ring groove and improve the durability of the piston, a part of the outer peripheral surface of the piston forming the top ring groove has better wear resistance than the aluminum alloy base material. The method of forming the alloy structure has been studied.

【０００３】いまこれを本発明方法を適用して製造さる
べきピストンの正面図を示した図１を援用し、かつ図４
及び図５を参照して説明すると、符号１０はアルミニウ
ム合金製のピストンを総括的に示し、１２は第１のコン
プレッションリングが嵌装されるトップリング溝、１４
は第２のコンプレッションリングが嵌装されるセカンド
リング溝、１６はオイルリングが嵌装されるオイルリン
グ溝である。Now referring to FIG. 1, which shows a front view of a piston to be manufactured by applying the method of the present invention, and FIG.
Referring to FIG. 5 and FIG. 5, reference numeral 10 generally indicates a piston made of an aluminum alloy, 12 is a top ring groove in which the first compression ring is fitted, and 14 is a top ring groove.
Is a second ring groove into which the second compression ring is fitted, and 16 is an oil ring groove into which the oil ring is fitted.

【０００４】上記トップリング溝１２が形成されるべき
ピストン１０の素材の外周面には、図４に示すように位
置決め用の凹溝１８が設けられ、この凹溝１８内に合金
成分としての銅又は銅合金製のワイヤ２０が圧入され
る。圧入された銅又は銅合金製のワイヤ２０は、電子ビ
ーム、レーザビームのような高エネルギビーム２２を照
射されて溶融し、図５に示されているように、周辺のア
ルミニウム合金母材と融合して耐摩耗性が優れたアルミ
ニウム−銅合金部分２４が形成される。溶融したアルミ
ニウム−銅合金部分２４が凝固する際に収縮するため
に、表面に凹所２６が発生し、同合金部分２４にトップ
リング溝１２を削成する場合に、素材ピストンの外周面
を加工代ｔ１だけ大きく削り取らねばならない。このこ
とは、機械加工時間の増大及び素材材料費の増大を意味
し、ピストン製造コストの増大を招くこととなる。As shown in FIG. 4, a concave groove 18 for positioning is provided on the outer peripheral surface of the material of the piston 10 in which the top ring groove 12 is formed, and the concave groove 18 contains copper as an alloy component. Alternatively, the copper alloy wire 20 is press-fitted. The press-fitted wire 20 made of copper or a copper alloy is irradiated with a high energy beam 22 such as an electron beam or a laser beam to be melted and fused with a surrounding aluminum alloy base material as shown in FIG. Thus, the aluminum-copper alloy portion 24 having excellent wear resistance is formed. When the molten aluminum-copper alloy portion 24 contracts when it solidifies, a recess 26 is generated on the surface, and when the top ring groove 12 is formed in the alloy portion 24, the outer peripheral surface of the material piston is processed. must be scraped off increased by generation t 1. This means an increase in machining time and an increase in raw material cost, resulting in an increase in piston manufacturing cost.

【０００５】[0005]

【発明が解決しようとする課題】本発明は、ピストンリ
ング溝を形成すべきピストン外周部分に、電子ビーム等
の高エネルギビームを用いて耐摩耗性が優れたアルミニ
ウム−銅合金組織を生成するものにおいて、素材ピスト
ンの外周面の加工代を著しく少なくすることにより、ピ
ストンの製造コストを低減し得るピストン製造方法を提
供することを目的とするものである。SUMMARY OF THE INVENTION According to the present invention, an aluminum-copper alloy structure having excellent wear resistance is produced by using a high energy beam such as an electron beam in the outer peripheral portion of a piston where a piston ring groove is to be formed. It is an object of the present invention to provide a piston manufacturing method that can reduce the manufacturing cost of the piston by significantly reducing the machining allowance of the outer peripheral surface of the material piston.

【０００６】[0006]

【課題を解決するための手段】本発明は、上記目的を達
成するために創案されたもので、アルミニウム合金製ピ
ストンのピストンリング溝を形成すべき部分の外周面
を、同外周面に隣接する部分の外周面部より大径に形成
し、同大径部分に銅又は銅合金製のワイヤを嵌装して同
ワイヤを電子ビーム等の高エネルギビームにより溶融さ
せてアルミニウム−銅合金組織を生成させ、ピストン外
周面を均等に仕上げ加工した後、上記アルミニウム−銅
合金部分にピストンリング溝を加工したことを特徴とす
る内燃機関用ピストンの製造方法を提案するものであ
る。SUMMARY OF THE INVENTION The present invention was devised to achieve the above object. The outer peripheral surface of the portion of the aluminum alloy piston where the piston ring groove is to be formed is adjacent to the outer peripheral surface. Formed to have a larger diameter than the outer peripheral surface of the part, and fitting a wire made of copper or copper alloy into the large diameter part and melting the wire with a high energy beam such as an electron beam to generate an aluminum-copper alloy structure. The present invention proposes a method for manufacturing a piston for an internal combustion engine, which comprises uniformly finishing the outer peripheral surface of the piston and then forming a piston ring groove in the aluminum-copper alloy portion.

【０００７】[0007]

【作用】本発明によれば、電子ビーム等の高エネルギビ
ームにより溶融される銅又は銅合金ワイヤと共に溶融す
るピストンの外周面部が、隣接するピストン外周面部よ
り予め大径に形成されるので、アルミニウム−銅合金部
分が凝固する際に収縮しても、ピストン素材の表面に深
い凹所が形成されることがなく、ピストン外周面の仕上
代を著しく少なくすることができる。According to the present invention, since the outer peripheral surface of the piston that is melted together with the copper or copper alloy wire that is melted by a high energy beam such as an electron beam is formed to have a larger diameter than the outer peripheral surface of the adjacent piston, Even if the copper alloy portion contracts when it solidifies, deep recesses are not formed in the surface of the piston material, and the finishing allowance of the piston outer peripheral surface can be significantly reduced.

【０００８】[0008]

【実施例】以下本発明の実施例を図１、図２及び図３に
ついて具体的に説明する。本発明によれば、先づ、トッ
プリング溝１２が形成さるべきアルミニウム合金製ピス
トン素材の外周面に、隣接するピストン外周面より大径
の段部２８が予め形成され、同段部２８に位置決めのた
めの凹溝１８が設けられる。Embodiments of the present invention will be specifically described below with reference to FIGS. 1, 2 and 3. According to the present invention, first, the step portion 28 having a diameter larger than that of the adjacent piston outer peripheral surface is previously formed on the outer peripheral surface of the aluminum alloy piston material on which the top ring groove 12 is to be formed, and the step portion 28 is positioned at the same step portion 28. Is provided with a concave groove 18 for.

【０００９】次に、凹溝１８内に銅又は銅合金製のワイ
ヤ２０が圧入され、電子ビーム等の高エネルギビーム２
２を照射することによって、図３に示されているような
耐摩耗性が優れたアルミニウム−銅合金部分２４が形成
され、同アルミニウム−銅合金部分２４の凝固後に、ピ
ストン１０の外周面が均等に仕上げられたのち、上記ア
ルミニウム−銅合金部分２４に、トップリング溝１２が
削設される。Next, a wire 20 made of copper or a copper alloy is press-fitted into the recessed groove 18, and a high energy beam 2 such as an electron beam is supplied.
By irradiating 2, the aluminum-copper alloy portion 24 having excellent wear resistance as shown in FIG. 3 is formed, and after the aluminum-copper alloy portion 24 is solidified, the outer peripheral surface of the piston 10 is made uniform. Then, the top ring groove 12 is formed in the aluminum-copper alloy portion 24.

【００１０】上記のように、ピストン素材の外周面に銅
又は銅合金ワイヤ２０と共に溶融して合金を作る段部２
８を予め設けておくことにより、アルミニウム−銅合金
部分２４の凝固収縮後、その表面に深い凹所が発生する
ことを回避することができ、従ってピストン外周面の仕
上代ｔ２を前記通常の手法による場合のｔ１より著しく
少なくすることができ、従って機械加工時間を低減する
と共に、無駄に削り去られる材料を少なくして歩留りを
向上し、結局製造コストを低減することができる。As described above, the step portion 2 which is melted with the copper or copper alloy wire 20 to form an alloy on the outer peripheral surface of the piston material.
By providing 8 in advance, it is possible to avoid the occurrence of deep recesses on the surface of the aluminum-copper alloy portion 24 after solidification shrinkage, and therefore the finishing allowance t 2 on the outer peripheral surface of the piston is set to the above-mentioned normal value. This can be significantly reduced from t 1 in the case of the method, and therefore, the machining time can be reduced, the material that is wastefully scraped off can be reduced, the yield can be improved, and the manufacturing cost can be eventually reduced.

【００１１】なお、上記段部２８の隣接するピストン外
周面部分との段差、即ち半径方向の突出量ｈ及びピスト
ン軸線方向の段部２８の巾ｗは、ピストン１０自体の大
きさ即ちトップリング溝１２の断面積の大小、合金成分
としての銅又は銅合金ワイヤの量、高エネルギビーム２
２の入熱量等によって実験的に定められる。なお、本発
明は、最も苛酷な摩耗条件下にあるトップリング溝に適
用されて特に有益であるが、その他のリング溝にも勿論
適用し得るものである。The step between the stepped portion 28 and the adjacent outer peripheral surface of the piston, that is, the amount of protrusion h in the radial direction and the width w of the stepped portion 28 in the piston axial direction is the size of the piston 10 itself, that is, the top ring groove. 12 large and small cross-sectional area, amount of copper or copper alloy wire as alloy component, high energy beam 2
It is experimentally determined by the heat input amount of 2 and the like. The present invention is particularly useful when applied to the top ring groove under the most severe wear conditions, but can of course be applied to other ring grooves.

【００１２】[0012]

【発明の効果】叙上のように、本発明に係る内燃機関用
ピストンの製造方法は、アルミニウム合金製ピストンの
ピストンリング溝を形成すべき部分の外周面を、同外周
面に隣接する部分の外周面部より大径に形成し、同大径
部分に銅又は銅合金製のワイヤを嵌装して同ワイヤを電
子ビーム等の高エネルギビームにより溶融させてアルミ
ニウム−銅合金組織を生成させ、ピストン外周面を均等
に仕上げ加工した後、上記アルミニウム−銅合金部分に
ピストンリング溝を加工したことを特徴とし、耐摩耗性
が優れたアルミニウム−銅合金組織の部分にリング溝を
形成したアルミニウム合金製ピストンを安価に提供し得
る利点がある。As described above, in the method of manufacturing a piston for an internal combustion engine according to the present invention, the outer peripheral surface of the portion of the piston made of the aluminum alloy in which the piston ring groove is to be formed is the same as the portion adjacent to the outer peripheral surface. It is formed to have a larger diameter than the outer peripheral surface, and a wire made of copper or a copper alloy is fitted to the large diameter part to melt the wire with a high energy beam such as an electron beam to generate an aluminum-copper alloy structure, and a piston After finishing the outer peripheral surface evenly, a piston ring groove is formed in the aluminum-copper alloy portion, and an aluminum alloy made by forming a ring groove in the aluminum-copper alloy structure portion having excellent wear resistance. There is an advantage that the piston can be provided at a low cost.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明方法を適用して製造さるべきアルミニウ
ム合金製ピストンの正面図である。FIG. 1 is a front view of an aluminum alloy piston to be manufactured by applying the method of the present invention.

【図２】図１に示したピストンのトップリング溝を形成
すべき部分にアルミニウム−銅合金部分を形成する態様
を示した部分的断面図である。2 is a partial cross-sectional view showing an embodiment in which an aluminum-copper alloy portion is formed in a portion where a top ring groove of the piston shown in FIG. 1 is to be formed.

【図３】図２における段部２８及び銅又は銅合金ワイヤ
２０が溶融して形成されたアルミニウム−銅合金部分を
示す断面図である。3 is a sectional view showing an aluminum-copper alloy portion formed by melting the step portion 28 and the copper or copper alloy wire 20 in FIG.

【図４】通常の方法によってトップリング溝を形成すべ
き部分にアルミニウム−銅合金部分を形成する態様を示
した部分的断面図である。FIG. 4 is a partial cross-sectional view showing an embodiment in which an aluminum-copper alloy portion is formed in a portion where a top ring groove is to be formed by a usual method.

【図５】図４に示した通常の方法により形成されたアル
ミニウム−銅合金部分の断面図である。5 is a cross-sectional view of an aluminum-copper alloy portion formed by the conventional method shown in FIG.

【符号の説明】[Explanation of symbols]

１０ ピストン １２ トップリング溝 １８ 凹溝 ２０ 銅又は銅合金ワイヤ ２２ 高エネルギビーム ２４ アルミニウム−銅合金部分 ２８ 大径の段部 10 Piston 12 Top Ring Groove 18 Recessed Groove 20 Copper or Copper Alloy Wire 22 High Energy Beam 24 Aluminum-Copper Alloy Part 28 Large Diameter Step

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 アルミニウム合金製ピストンのピストン
リング溝を形成すべき部分の外周面を、同外周面に隣接
する部分の外周面部より大径に形成し、同大径部分に銅
又は銅合金製のワイヤを嵌装して同ワイヤを電子ビーム
等の高エネルギビームにより溶融させてアルミニウム−
銅合金組織を生成させ、ピストン外周面を均等に仕上げ
加工した後、上記アルミニウム−銅合金部分にピストン
リング溝を加工したことを特徴とする内燃機関用ピスト
ンの製造方法。1. An aluminum alloy piston, wherein the outer peripheral surface of a portion where a piston ring groove is to be formed is formed to have a larger diameter than an outer peripheral surface portion of a portion adjacent to the outer peripheral surface, and the large diameter portion is made of copper or a copper alloy. Aluminum wire and melt it with a high-energy beam such as an electron beam.
A method for manufacturing a piston for an internal combustion engine, comprising forming a copper alloy structure, uniformly finishing the outer peripheral surface of the piston, and then forming a piston ring groove in the aluminum-copper alloy portion.
JP6087106A 1994-03-17 1994-03-17 Method of manufacturing piston for internal combustion engine Expired - Fee Related JP2586325B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6087106A JP2586325B2 (en) 1994-03-17 1994-03-17 Method of manufacturing piston for internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6087106A JP2586325B2 (en) 1994-03-17 1994-03-17 Method of manufacturing piston for internal combustion engine

Publications (2)

Publication Number Publication Date
JPH0771314A true JPH0771314A (en) 1995-03-14
JP2586325B2 JP2586325B2 (en) 1997-02-26

Family

ID=13905700

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6087106A Expired - Fee Related JP2586325B2 (en) 1994-03-17 1994-03-17 Method of manufacturing piston for internal combustion engine

Country Status (1)

Country Link
JP (1) JP2586325B2 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6141731A (en) * 1984-08-06 1986-02-28 Toyota Motor Corp Manufacture of piston
JPS6272457U (en) * 1985-10-28 1987-05-09

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6141731A (en) * 1984-08-06 1986-02-28 Toyota Motor Corp Manufacture of piston
JPS6272457U (en) * 1985-10-28 1987-05-09

Also Published As

Publication number Publication date
JP2586325B2 (en) 1997-02-26

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