JPS6133652B2 - - Google Patents
Info
- Publication number
- JPS6133652B2 JPS6133652B2 JP1742780A JP1742780A JPS6133652B2 JP S6133652 B2 JPS6133652 B2 JP S6133652B2 JP 1742780 A JP1742780 A JP 1742780A JP 1742780 A JP1742780 A JP 1742780A JP S6133652 B2 JPS6133652 B2 JP S6133652B2
- Authority
- JP
- Japan
- Prior art keywords
- connecting rod
- cast
- cast iron
- manufacturing
- extra
- 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
Links
- 238000004519 manufacturing process Methods 0.000 claims description 17
- 229910001018 Cast iron Inorganic materials 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 7
- 238000005480 shot peening Methods 0.000 claims description 6
- 238000005266 casting Methods 0.000 description 10
- 230000007547 defect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000003754 machining Methods 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 150000003568 thioethers Chemical class 0.000 description 2
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
Landscapes
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Description
【発明の詳細な説明】
本発明は、鋳鉄製のコネクテイングロツドの製
造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a connecting rod made of cast iron.
従来、自動車のエンジン等において用いられる
コネクテイングロツドは、通常鍛造によつて製作
されている。すなわち、第１図に示すように、鍛
造されたコネクテイングロツド鍛造品に対し、内
部残留応力や歪を除去するための熱処理工程、バ
リを除去するためのバリ取り工程、スケールを除
去するとともに表面硬化を行うためのシヨツトピ
ーニング工程、組織を緻密化させるためのコイニ
ング工程、および仕上げ加工を行う機械加工工程
の各工程を順次行つて製造されるものである。し
かし、この鍛造製コネクテイングロツドの製造方
法では、多くの金型や多数の製造工程工数を要す
るため、製造コストが高くなるという欠点を有し
ている。 Conventionally, connecting rods used in automobile engines and the like are usually manufactured by forging. That is, as shown in Fig. 1, the forged connecting rod forged product undergoes a heat treatment process to remove internal residual stress and strain, a deburring process to remove burrs, and a scale removal process. It is manufactured by sequentially performing the following steps: shot peening to harden the surface, coining to densify the structure, and machining to finish. However, this method of manufacturing a forged connecting rod requires a large number of molds and a large number of man-hours in the manufacturing process, which has the disadvantage of increasing manufacturing costs.
そのため、このようなコネクテイングロツドを
鋳鉄製として、製造コストの低減化を、図ること
が一部行われているが、鋳鉄製であるために、引
け巣や添加物（例えばマグネシウムの酸化物、硫
化物）の介在物やピンホールなどによる鋳造の欠
陥が懸念され、疲労強度などに不安があるという
欠点を有しており、特に強度が要求されるコネク
テイングロツドの連幹部において問題があつた。 For this reason, some efforts have been made to reduce manufacturing costs by making such connecting rods made of cast iron. There are concerns about casting defects due to inclusions (sulfides, sulfides), pinholes, etc., and there are concerns about fatigue strength, which is a problem especially in the connecting parts of connecting rods where strength is required. It was hot.
本発明はかかる点に鑑みてなされたもので、鋳
鉄製のコネクテイングロツドの製造において、上
記鋳造欠陥は表面部に生じやすいということに着
目し、この鋳造欠陥が生じる表面部の分だけ余分
に肉厚にして鋳造し、鋳造後、この余肉部を削除
することにより、上記従来の鋳鉄製コネクテイン
グロツドの鋳造欠陥をなくし、疲労強度および信
頼性の高い鋳鉄製のコネクテイングロツドの製造
方法を提供しようとするものである。 The present invention has been made in view of the above-mentioned problems, and focuses on the fact that the above-mentioned casting defects are likely to occur on the surface portion when manufacturing a connecting rod made of cast iron. By casting with a thick wall and removing this extra wall after casting, the casting defects of the conventional cast iron connecting rods mentioned above are eliminated, resulting in a cast iron connecting rod with high fatigue strength and reliability. The present invention aims to provide a method for manufacturing.
すなわち、本発明は、コネクテイングロツドの
連幹部に余肉部を設けて鋳放し材を鋳造し、次い
で上記鋳放し材の余肉部を機械加工ににより削除
し、この部分をシヨツトピーニングすることを特
徴とするものである。 That is, in the present invention, an as-cast material is cast by providing an extra-thickness part in the connecting part of a connecting rod, and then the extra-thickness part of the as-cast material is removed by machining, and this part is subjected to shot peening. It is characterized by:
以下、本発明について図面に従つて詳細に説明
する。 Hereinafter, the present invention will be explained in detail with reference to the drawings.
第２図は本発明に係る鋳鉄製コネクテイングロ
ツドの製造工程を示し、先ず、鋳鉄により、第３
図に示すように一端に小端部１、他端に大端部
２、中間部に小端部１と大端部２とを連接する断
面Ｉ字状の連幹部３を有するコネクテイングロツ
ド鋳放し材Ａを鋳造する。尚、上記鋳鉄として
は、特に限定されないが、球状黒鉛鋳鉄が強度お
よび靭性の点で優れているので好ましい。また鍛
造品と較べて振動減衰能が優れているのは勿論で
ある。 Fig. 2 shows the manufacturing process of the cast iron connecting rod according to the present invention.
As shown in the figure, a connecting rod has a small end 1 at one end, a large end 2 at the other end, and a linking section 3 with an I-shaped cross section connecting the small end 1 and the large end 2 at the middle part. Cast as-cast material A. The above-mentioned cast iron is not particularly limited, but spheroidal graphite cast iron is preferable since it has excellent strength and toughness. Moreover, it goes without saying that it has superior vibration damping ability compared to forged products.
その際、特に強度が要求される上記連幹部３に
は第４図ａに示すように、その周端縁（図ではＩ
形状の上下フランジ両側端部）に余肉部４が設け
られて鋳造されている。この余肉部４は、鋳造欠
陥はそのほとんどが鋳物表面から１mm以内に集中
して発生し、この鋳造欠陥発生部分を余肉部とす
るために設けられたものであり、通常若干厚めに
１〜1.5mmの厚みとなるように設定されている。 At that time, as shown in FIG.
It is cast with extra thickness 4 provided at both ends of the upper and lower flanges of the shape. Most of the casting defects occur concentratedly within 1 mm from the surface of the casting, and this extra thickness part 4 is provided to make this part where casting defects occur as an extra thickness part, and is usually made slightly thicker. The thickness is set to ~1.5mm.
次いで、上記コネクテイングロツド鋳放し材Ａ
に対し、バリ取り加工によつてバリを除去した
後、上記連幹部３の余肉部４を、第４図ｂ，b′に
示すようにグラインダー５による研削等の機械加
工によつて削除する。この余肉部４の削除によつ
て、上記鋳造欠陥発生部分共々削り落されること
になる。尚、上記機械加工としては、上述の研削
加工の他にフライス加工が好ましい。 Next, the connecting rod as-cast material A
After removing the burrs by deburring, the excess thickness 4 of the linking section 3 is removed by mechanical processing such as grinding with a grinder 5, as shown in FIGS. 4b and b'. . By removing this extra wall portion 4, the above-mentioned casting defect occurring portion is also shaved off. In addition to the above-mentioned grinding process, milling process is preferable as the above-mentioned machining process.
さらに、このように余肉部４が削除された連幹
部３に対し、第４図ｃに示すようにシヨツトピー
ニングを行うと、研削角部が面取りされるととも
に、表面が加工硬化して疲労強度が高められ、さ
らにピンホール等がつぶされて平滑化し、不良品
の発生が少なくなる。 Furthermore, when shot peening is performed on the connecting section 3 from which the excess thickness 4 has been removed, as shown in Fig. 4c, the ground corners are chamfered and the surface is work-hardened to reduce fatigue. The strength is increased, pinholes etc. are crushed and smoothed, and the occurrence of defective products is reduced.
しかる後、上記コネクテイングロツド鋳放し材
Ａの小端部１および大端部２を仕上げ機械加工す
ることにより、鋳鉄製コネクテイングロツドが得
られる。 Thereafter, the small end 1 and large end 2 of the connecting rod as-cast material A are finish-machined to obtain a cast iron connecting rod.
このようにして得られた鋳鉄製コネクテイング
ロツドは、鋳造欠陥の発生し易い表面部を削除し
たことにより疲労強度が増大し、さらにシヨツト
ピーニングにより角部の面取りおよび表面の加工
硬化が行われ、疲労強度が一層高められて、強度
性、信頼性に優れているとともに、不良品の発生
も少なく、しかも鋳鉄製のため、振動減衰能が優
れているので、エンジン騒音の低減化を図ること
ができるものである。また、鋳造によるため、高
化な金型を要さず、しかも第２図より明らかなよ
うに製造工程工数が減少するので、安価に製造す
ることができるものである。 The cast iron connecting rod thus obtained has increased fatigue strength by removing the surface areas where casting defects are likely to occur, and the corners are chamfered by shot peening and the surface is work hardened. It has even higher fatigue strength and is superior in strength and reliability, with fewer defective products.Furthermore, since it is made of cast iron, it has excellent vibration damping ability, reducing engine noise. It is something that can be done. Furthermore, since it is cast, no expensive mold is required, and as is clear from FIG. 2, the number of manufacturing process steps is reduced, so it can be manufactured at a low cost.
尚、上記実施例ではコネクテイングロツドの連
幹部３の断面形状がＩ字状のものについて述べた
が、本発明はその他種々の断面形状の連幹部を有
するコネクテイングロツドについても適用できる
のは言うまでもない。 In the above embodiment, the connecting rod 3 of the connecting rod has an I-shaped cross section, but the present invention can also be applied to connecting rods having connecting rods of various other cross-sectional shapes. Needless to say.
また、上記実施例ではコネクテイングロツドの
連幹部３のみに余肉部４を設けて鋳放し材Ａを鋳
造したが、該連幹部３以外の小端部１および大端
部２にも余肉部を設けて鋳造し、該余肉部を削除
するようにしてもよく、より一層強度性を高める
ことができるが、強度が要求される連幹部３のみ
に余肉部４を設けるだけで、強度性確保の上で十
分である。 Further, in the above embodiment, the as-cast material A was cast with the extra wall portion 4 provided only on the connecting portion 3 of the connecting rod, but the small end portion 1 and the large end portion 2 other than the connecting rod portion 3 were also left with excess thickness. It is also possible to cast with a thick part and remove the extra thick part, which can further increase the strength, but it is also possible to just provide the extra thick part 4 only on the connecting part 3 where strength is required. , is sufficient to ensure strength.
以上の如く、本発明によれば、鋳鉄製のコネク
テイングロツドの製造方法において、コネクテイ
ングロツドの連幹部に余肉部を設けて鋳放し材を
鋳造し、次いで上記鋳放し材の余肉部を削除し、
さらに上記余肉部が削除された連幹部をシヨツト
ピーニングにして、コネクテイングロツドを製造
するものであるので、製造コストが安価で、疲労
強度および信頼性が高く、しかもエンジン騒音の
低減化を図ることができる鋳鉄製コネクテイング
ロツドを提供することができるものである。 As described above, according to the present invention, in the method of manufacturing a connecting rod made of cast iron, an extra wall portion is provided in the connecting portion of the connecting rod, and an as-cast material is cast, and then the remaining part of the as-cast material is cast. Remove the flesh part,
Furthermore, since the connecting rod from which the above-mentioned excess thickness has been removed is subjected to shot peening to manufacture the connecting rod, the manufacturing cost is low, fatigue strength and reliability are high, and engine noise is reduced. It is possible to provide a cast iron connecting rod that can achieve the following.
第１図は従来の鍛造製コネクテイングロツドの
製造工程図、第２図は本発明に係る鋳鉄製コネク
テイングロツドの製造工程図、第３図はコネクテ
イングロツドの正面図、第４図は第２図の各工程
の説明図である。
Ａ……コネクテイングロツド鋳放し材、１……
小端部、２……大端部、３……連幹部、４……余
肉部、５……グラインダー。
Fig. 1 is a manufacturing process diagram of a conventional forged connecting rod, Fig. 2 is a manufacturing process diagram of a cast iron connecting rod according to the present invention, Fig. 3 is a front view of the connecting rod, and Fig. 4 is a manufacturing process diagram of a conventional forged connecting rod. The figure is an explanatory diagram of each step in FIG. 2. A... Connecting rod as-cast material, 1...
Small end portion, 2...large end portion, 3...connection section, 4...excess portion, 5...grinder.
Claims (1)
おいて、コネクテイングロツドの連幹部に余肉部
を設けて鋳放し材を鋳造し、次いで上記鋳放し材
の余肉部を削除し、さらに上記余肉部が削除され
た連幹部をシヨツトピーニングして、コネクテイ
ングロツドを製造することを特徴とする鋳鉄製の
コネクテイングロツドの製造方法。1. In a method for manufacturing a connecting rod made of cast iron, an as-cast material is cast by providing an extra wall in the connecting section of the connecting rod, then the extra wall of the as-cast material is removed, and then the extra wall is cast. A method for manufacturing a connecting rod made of cast iron, characterized in that the connecting rod is manufactured by shot peening the connecting portion from which the flesh part has been removed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1742780A JPS56114638A (en) | 1980-02-14 | 1980-02-14 | Connecting rod manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1742780A JPS56114638A (en) | 1980-02-14 | 1980-02-14 | Connecting rod manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56114638A JPS56114638A (en) | 1981-09-09 |
| JPS6133652B2 true JPS6133652B2 (en) | 1986-08-04 |
Family
ID=11943709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1742780A Granted JPS56114638A (en) | 1980-02-14 | 1980-02-14 | Connecting rod manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56114638A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61163706U (en) * | 1985-03-30 | 1986-10-11 | ||
| JPS6284974A (en) * | 1985-10-09 | 1987-04-18 | Toyota Motor Corp | Method of highly strengthening outer surface of metal |
| JPS6284973A (en) * | 1985-10-09 | 1987-04-18 | Toyota Motor Corp | Method of highly strengthening outer surface of metal |
| DE4114488C1 (en) * | 1991-05-03 | 1992-09-24 | Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De |
-
1980
- 1980-02-14 JP JP1742780A patent/JPS56114638A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56114638A (en) | 1981-09-09 |
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