CN105714304A - 40Cr pin shaft heat treatment process - Google Patents

40Cr pin shaft heat treatment process Download PDF

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Publication number
CN105714304A
CN105714304A CN201410721615.3A CN201410721615A CN105714304A CN 105714304 A CN105714304 A CN 105714304A CN 201410721615 A CN201410721615 A CN 201410721615A CN 105714304 A CN105714304 A CN 105714304A
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CN
China
Prior art keywords
pin shaft
quenching
bearing pin
nitriding
hardness
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
CN201410721615.3A
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Chinese (zh)
Inventor
不公告发明人
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.)
Chongqing Yuanhuang Machinery Manufacturing Co Ltd
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Chongqing Yuanhuang Machinery Manufacturing Co Ltd
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 Chongqing Yuanhuang Machinery Manufacturing Co Ltd filed Critical Chongqing Yuanhuang Machinery Manufacturing Co Ltd
Priority to CN201410721615.3A priority Critical patent/CN105714304A/en
Publication of CN105714304A publication Critical patent/CN105714304A/en
Pending legal-status Critical Current

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Abstract

The present invention discloses a 40Cr pin shaft heat treatment process which is characterized by comprising the following steps: (1) after rough machining of a 40Cr pin shaft, performing quenched-tempered heat treatment, wherein the process conditions comprise quenching at 880-900 DEG C in oil and tempering at high temperature; (2) semifinishing the 40Cr pin shaft, and performing once destressing tempering; and (3) finishing the 40Cr pin shaft, and then performing nitriding chemical thermal treatment. The 40Cr pin shaft heat treatment process can improve hardness, wear resistance, fatigue resistance and corrosion resistance of the pin shaft, and the service life is greatly extended.

Description

A kind of 40Cr bearing pin Technology for Heating Processing
Technical field
The invention belongs to Technology for Heating Processing field, specifically a kind of 40Cr bearing pin Technology for Heating Processing.
Background technology
40Cr pin shaft parts, after conditioned process, mechanical property does not often reach requirement.Prior art generally adopts oil or water to carry out Quenching Treatment, adopts oil quenching, detects hardness at about HRC35, deform little, but quenching hardness is not enough after quenching;Adopting water quenching and oil-cooling double quenching, detect hardness at about HRC50, but distorsion during quenching is big after quenching, follow-up grinding is difficult, and through hole exists cracking phenomena, and percent defective is high.Therefore, in prior art, the quenching of 40Cr bearing pin is second-rate, for improving product quality, it is necessary to be further improved.
Summary of the invention
In view of the deficiency that prior art exists, it is an object of the invention to provide a kind of 40Cr bearing pin Technology for Heating Processing, can improve the hardness of bearing pin, wearability, resisting fatigue, resistance to corrosion so that the life-span be greatly prolonged.
A kind of 40Cr bearing pin Technology for Heating Processing, it is characterised in that this process comprises the following steps:
(1) carrying out Tempering and Quenching after the roughing of 40Cr bearing pin, process conditions are: quenching: 880-900 DEG C of oil quenching, high tempering: 620-640 DEG C of air cooling, hardness is 32-38HRC;
(2) bearing pin carrying out semifinishing, then carry out a destressing temper, process conditions are: temperature is 560-580 DEG C, and the process time is 2-3h;
(3) bearing pin carrying out polish then nitriding thermo-chemical treatment, process conditions are: nitriding temperature is 550-560 DEG C, and nitriding time is 5-h, and ammonia dissociation rate is 45%-65%, oil cooling after coming out of the stove, nitriding thickness 0.1-0.15mm, and hardness is 1200-1250HV;Diffusion thickness 0.15-0.2mm, hardness is 1100-1200HV.
A kind of 40Cr bearing pin Technology for Heating Processing of the present invention is by each step requirement of specification, Parameter Conditions and points for attention, this technique is in order to improve bearing pin internal organizational structure, ensure that its heart portion obtains enough obdurabilities, prepare thus performing tissue for nitriding, modified quenching and high tempering heat treatment must be carried out before nitriding, to obtain required tempered sorbite tissue, before nitriding, in original structure, ferrite content increases, the hardness of bearing pin, wearability can be improve, resisting fatigue, resistance to corrosion so that the life-span be greatly prolonged.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described, and its operating procedure is as follows:
A kind of 40Cr bearing pin Technology for Heating Processing, this process comprises the following steps:
(1) carrying out Tempering and Quenching after the roughing of 40Cr bearing pin, process conditions are: quenching: 880-900 DEG C of oil quenching, high tempering: 620-640 DEG C of air cooling, hardness is 32-38HRC;
(2) bearing pin carrying out semifinishing, then carry out a destressing temper, process conditions are: temperature is 560-580 DEG C, and the process time is 2-3h;
(3) bearing pin carrying out polish then nitriding thermo-chemical treatment, process conditions are: nitriding temperature is 550-560 DEG C, and nitriding time is 5-h, and ammonia dissociation rate is 45%-65%, oil cooling after coming out of the stove, nitriding thickness 0.1-0.15mm, and hardness is 1200-1250HV;Diffusion thickness 0.15-0.2mm, hardness is 1100-1200HV.
The preferred embodiment of the present invention described in detail above.It is to be understood that those of ordinary skill in the art just can make many modifications and variations according to the design of the present invention without creative work.Therefore, all technical staff in the art are under this invention's idea on the basis of existing technology by logic minute analysis, reasoning or the available technical scheme of limited experiment, the protection domain being all defined in the patent claims.

Claims (1)

1. a 40Cr bearing pin Technology for Heating Processing, it is characterised in that this process comprises the following steps:
(1) carrying out Tempering and Quenching after the roughing of 40Cr bearing pin, process conditions are: quenching: 880-900 DEG C of oil quenching, high tempering: 620-640 DEG C of air cooling, hardness is 32-38HRC;
(2) bearing pin carrying out semifinishing, then carry out a destressing temper, process conditions are: temperature is 560-580 DEG C, and the process time is 2-3h;
(3) bearing pin carrying out polish then nitriding thermo-chemical treatment, process conditions are: nitriding temperature is 550-560 DEG C, and nitriding time is 5-h, and ammonia dissociation rate is 45%-65%, oil cooling after coming out of the stove, nitriding thickness 0.1-0.15mm, and hardness is 1200-1250HV;Diffusion thickness 0.15-0.2mm, hardness is 1100-1200HV.
CN201410721615.3A 2014-12-03 2014-12-03 40Cr pin shaft heat treatment process Pending CN105714304A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410721615.3A CN105714304A (en) 2014-12-03 2014-12-03 40Cr pin shaft heat treatment process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410721615.3A CN105714304A (en) 2014-12-03 2014-12-03 40Cr pin shaft heat treatment process

Publications (1)

Publication Number Publication Date
CN105714304A true CN105714304A (en) 2016-06-29

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410721615.3A Pending CN105714304A (en) 2014-12-03 2014-12-03 40Cr pin shaft heat treatment process

Country Status (1)

Country Link
CN (1) CN105714304A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107641784A (en) * 2017-09-08 2018-01-30 厦门真冈热处理有限公司 A kind of heat treatment method of wind-driven generator drum-shaped tooth type shaft coupling
CN108148991A (en) * 2016-12-06 2018-06-12 新昌县嘉德科技发展有限公司 A kind of processing technology of axis pin
CN109371206A (en) * 2018-12-24 2019-02-22 海盐城西热处理有限公司 A kind of pivot pin heat treatment process
CN109611429A (en) * 2018-12-27 2019-04-12 陕西铁马铸锻有限公司 Pin shaft and its heat treatment process
CN111118261A (en) * 2020-03-09 2020-05-08 湖南申亿机械应用研究院有限公司 Heat treatment process for 40CrNiMo forged pin shaft

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108148991A (en) * 2016-12-06 2018-06-12 新昌县嘉德科技发展有限公司 A kind of processing technology of axis pin
CN107641784A (en) * 2017-09-08 2018-01-30 厦门真冈热处理有限公司 A kind of heat treatment method of wind-driven generator drum-shaped tooth type shaft coupling
CN107641784B (en) * 2017-09-08 2019-12-27 厦门真冈热处理有限公司 Heat treatment method for drum-shaped tooth type coupling of wind driven generator
CN109371206A (en) * 2018-12-24 2019-02-22 海盐城西热处理有限公司 A kind of pivot pin heat treatment process
CN109611429A (en) * 2018-12-27 2019-04-12 陕西铁马铸锻有限公司 Pin shaft and its heat treatment process
CN109611429B (en) * 2018-12-27 2021-04-02 陕西铁马铸锻有限公司 Pin shaft and heat treatment process thereof
CN111118261A (en) * 2020-03-09 2020-05-08 湖南申亿机械应用研究院有限公司 Heat treatment process for 40CrNiMo forged pin shaft

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Application publication date: 20160629

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