JPS5989713A - Hardening method - Google Patents

Hardening method

Info

Publication number
JPS5989713A
JPS5989713A JP19851482A JP19851482A JPS5989713A JP S5989713 A JPS5989713 A JP S5989713A JP 19851482 A JP19851482 A JP 19851482A JP 19851482 A JP19851482 A JP 19851482A JP S5989713 A JPS5989713 A JP S5989713A
Authority
JP
Japan
Prior art keywords
hardness
connecting rod
hardened
annealing
diameter end
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
Application number
JP19851482A
Other languages
Japanese (ja)
Inventor
Tadaaki Yano
矢野　忠明
Hiroshi Shimizu
浩 清水
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 JP19851482A priority Critical patent/JPS5989713A/en
Publication of JPS5989713A publication Critical patent/JPS5989713A/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below

Abstract

PURPOSE:To manufacture an easily machinable member with sufficient durability by increasing the hardness of a member by quenching and reducing the hardness of the parts of the member to be mechanically worked by annealing. CONSTITUTION:A connecting rod 1 of an engine consisting of an end 2 of a larger diameter, an end 3 of a smaller diameter and a coupling part 4 coupling both the ends together is formed by forging, and the whole rod 1 is hardened to >=300, preferably about 450-500 hardness HB. The hardness of the ends 2, 3 is then reduced to <=300, preferably about 220-280 hardness HB by high frequency annealing. The ends 2, 3 are mechanically worked to complete the connecting rod 1.

Description

【発明の詳細な説明】 従来、エンジンのコネクティングロッドは鍛造焼入れ、
焼戻処理を行なって硬度をＨＢ２５０程度としている。[Detailed Description of the Invention] Conventionally, engine connecting rods are forged and hardened,
It is tempered to have a hardness of about HB250.

これは、エンジン性能上からは硬度がＨＢ３００〜３５
０が必要であるが、ＨＢ！ｔｏｏを越えると切削加工が
困難となるため、上述のように硬度を下げていた。This has a hardness of HB300 to 35 from the viewpoint of engine performance.
0 is required, but HB! If the hardness exceeds too much, cutting becomes difficult, so the hardness has been lowered as described above.

したがって、十分にエンジン性能を引き出すことができ
ず、またコネクティングロッドの耐久性も悪かった。Therefore, sufficient engine performance could not be brought out, and the durability of the connecting rod was also poor.

本発明は上記欠点を解消するもの・で、加工部材を焼入
れにより硬度ＨＢ３００を越るものにし１次に上記加工
部材の機械加工部分を焼なまして硬度をＨＢ３００以下
にしたことを特徴とする硬化方法を要旨とするものであ
る。The present invention solves the above-mentioned drawbacks, and is characterized in that the workpiece is hardened to have a hardness exceeding HB300, and first, the machined part of the workpiece is annealed to have a hardness of HB300 or less. The gist is the method.

以下１本発明の一実施例につ℃・て具体的に説明する。Hereinafter, one embodiment of the present invention will be specifically explained in degrees Celsius.

図面におし・て、エンジンのコネクチングロッド１は大
径端部２と小径端部３と両端部を連結する連結部４から
なっている。上記コネクチングロッド１は鍛造により成
形され、つづいて焼入れによりブリネル硬度ＨＢ４７０
にまで硬化される。次に大径端部２および小径端部３を
高周波節なましにより）ｆＢ硬度２５０にする。そして
、大小径端部２゜３を機械加工し、コネクチングロッド
１を完成させる。In the drawings, a connecting rod 1 for an engine includes a large-diameter end 2, a small-diameter end 3, and a connecting portion 4 that connects both ends. The connecting rod 1 is formed by forging and then hardened to a Brinell hardness of HB470.
hardened to. Next, the large diameter end 2 and the small diameter end 3 are made to have an fB hardness of 250 by high frequency annealing. Then, the large and small diameter ends 2.degree. 3 are machined to complete the connecting rod 1.

したがって、大小肉径端部２，３はＨＢ硬度２５０であ
るため機械加工が容易であり、また連結部４は高い応力
を受けるがＨＢ硬度４７０と十分な硬さを有しているの
で疲労強度も６５．８　ｋｇ、／　ｍ　ｒｌと十分な大
きさを有しているので、コネクチングロッドの耐久性も
向上するものである。Therefore, since the large and small wall diameter ends 2 and 3 have an HB hardness of 250, machining is easy, and although the connecting part 4 is subjected to high stress, it has sufficient hardness with an HB hardness of 470, so it has sufficient fatigue strength. Since the connecting rod has a sufficient size of 65.8 kg/m rl, the durability of the connecting rod is also improved.

なお、上記実施例ではコネクチングロッド１の全体を始
めにＨＢ４７０になるよう焼き入れしたが。In the above embodiment, the entire connecting rod 1 was first hardened to HB470.

ＨＢ３００以上であれば十分な耐久性を得られるが好ま
しくはＨＢ４５０〜５００である。Sufficient durability can be obtained if the HB is 300 or more, but the HB is preferably 450 to 500.

また、大小径端部２，３は焼なましによりＨＢ　２５０
にしたが、Ｈ８３００未満であれば機械加工が可能であ
るが、好ましくはＨＢ２２０〜２８０である。In addition, the large and small diameter ends 2 and 3 are annealed to HB 250
However, if it is less than H8300, machining is possible, but preferably HB220 to 280.

【図面の簡単な説明】[Brief explanation of the drawing]

図面は本発明の一実施例のコネクチングロツＦ１を示す
正面図である。 １；コネクチングロッド、　　２；大径端部。 ６；小径端部、　　４；連結部The drawing is a front view showing a connecting groove F1 according to an embodiment of the present invention. 1; Connecting rod; 2; Large diameter end. 6; Small diameter end, 4; Connecting part

Claims (1)

【特許請求の範囲】[Claims] 加工部材を焼入れにより硬度ＱＢ３００を越えるものに
し１次に上記加工部材の機械加工部分を焼なまして硬度
なＨＢ３００以下にしたことを特徴とする硬化方法A hardening method characterized in that the workpiece is quenched to have a hardness exceeding QB300, and first, the machined part of the workpiece is annealed to have a hardness of HB300 or less.
JP19851482A 1982-11-12 1982-11-12 Hardening method Pending JPS5989713A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19851482A JPS5989713A (en) 1982-11-12 1982-11-12 Hardening method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19851482A JPS5989713A (en) 1982-11-12 1982-11-12 Hardening method

Publications (1)

Publication Number Publication Date
JPS5989713A true JPS5989713A (en) 1984-05-24

Family

ID=16392399

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19851482A Pending JPS5989713A (en) 1982-11-12 1982-11-12 Hardening method

Country Status (1)

Country Link
JP (1) JPS5989713A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0493509U (en) * 1990-12-28 1992-08-13
JPH0493510U (en) * 1990-12-28 1992-08-13
JPH0589942U (en) * 1992-04-30 1993-12-07 エヌティエヌ株式会社 Bearing device
CN103128507A (en) * 2013-03-04 2013-06-05 南京紫薇精密机械有限公司 Method for processing elastic collet with hardness at three different levels
CN115341074A (en) * 2022-09-05 2022-11-15 江苏圣珀新材料科技有限公司 Annealing process of dual-phase steel

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0493509U (en) * 1990-12-28 1992-08-13
JPH0493510U (en) * 1990-12-28 1992-08-13
JPH0589942U (en) * 1992-04-30 1993-12-07 エヌティエヌ株式会社 Bearing device
CN103128507A (en) * 2013-03-04 2013-06-05 南京紫薇精密机械有限公司 Method for processing elastic collet with hardness at three different levels
CN115341074A (en) * 2022-09-05 2022-11-15 江苏圣珀新材料科技有限公司 Annealing process of dual-phase steel
CN115341074B (en) * 2022-09-05 2024-01-09 江苏圣珀新材料科技有限公司 Annealing process of dual-phase steel

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