CN105779707A - Thermal treatment method of cast eccentric shaft - Google Patents

Thermal treatment method of cast eccentric shaft Download PDF

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Publication number
CN105779707A
CN105779707A CN201610355344.3A CN201610355344A CN105779707A CN 105779707 A CN105779707 A CN 105779707A CN 201610355344 A CN201610355344 A CN 201610355344A CN 105779707 A CN105779707 A CN 105779707A
Authority
CN
China
Prior art keywords
eccentric shaft
quenching
temperature
thermal treatment
heat treatment
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
CN201610355344.3A
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Chinese (zh)
Inventor
吴俊德
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.)
Zhenjiang Jingwei Engineering Machinery Co Ltd
Original Assignee
Zhenjiang Jingwei Engineering Machinery 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 Zhenjiang Jingwei Engineering Machinery Co Ltd filed Critical Zhenjiang Jingwei Engineering Machinery Co Ltd
Priority to CN201610355344.3A priority Critical patent/CN105779707A/en
Publication of CN105779707A publication Critical patent/CN105779707A/en
Pending legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18Hardening; Quenching with or without subsequent tempering
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/773Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/28Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for plain shafts
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/008Martensite

Abstract

The invention provides a thermal treatment method of a cast eccentric shaft. The thermal treatment method comprises the steps of firstly carrying out carburizing treatment on the cast eccentric shaft; and after three-time quenching, carrying out high-temperature tempering. According to the invention, the thermal treatment method aimed at the cast eccentric shaft is designed, and the mechanical performance of the cast eccentric shaft is improved through multiple-time quenching and high-temperature tempering.

Description

Casting eccentric shaft heat treatment method
Technical field
The present invention relates to engineering machinery field, specifically a kind of shock resistance type eccentric shaft casting technique.
Background technology
Eccentric shaft is the same with its name, its center not at the center of axis, general axle, can only drive workpiece rotation, but eccentric shaft, not only can transmit rotation, revolution can also be transmitted simultaneously.Eccentric shaft is fixed generally by eccentric orfice and on electric machine rotational axis, when electric motor starting, does cam motion.Therefore automobile, electromotor, pump etc. it are widely used in.
Owing to eccentric shaft is higher for required precision, the processing of current eccentric shaft adopts lathe process more, adds the processing methods such as expansion sleeve method including Double Tops point method, three-jaw self-centering chuck shimming method, excentric sleeve method, excentric sleeve.The eccentric shaft precision that the benefit of Vehicle Processing is that production efficiency is high, process is higher, is suitable for large-scale production.For some special eccentric shafts needing to be often subject to external impacts, the product that conventional Vehicle Processing goes out is shorter for often service life, it is necessary to frequently change.
Owing to the product of Vehicle Processing and the interiors of products crystal formation of casting and structure are entirely different, existing eccentric shaft heat treatment method is not used to the eccentric shaft of casting.
Summary of the invention
The present invention is to solve problem of the prior art, devise a kind of heat treatment method for casting eccentric shaft, by repeated hardening and high tempering, improve the mechanical property of eccentric shaft.
One casting eccentric shaft heat treatment method of the present invention, comprises the following steps:
1) carry out three quenchings, by repeated hardening, make eccentric shaft obtain required martensitic structure, improve the hardness of workpiece, intensity and wearability, get ready for rear road heat treatment.
1.1) first time quenching, heating-up temperature is 900-950 DEG C, oil quenching;
1.2) second time quenching, heating-up temperature is 850-900 DEG C, oil quenching or shrend;
1.3) third time quenching, heating-up temperature is 800-850 DEG C, shrend;
2) it is heated to 650-727 DEG C, vacant 5-10min, it is then placed in incubator and is slowly cooled to room temperature by air, rate of cooling is 5-10 DEG C/min.After steel part is through-hardened, reheats and carry out high temperature quenching, eliminate eccentric shaft produced stress when quenching, make steel part have outside high hardness and wearability
Improve further, advanced Carburization Treatment before the quenching technical described in step 1), if the hardness requirement of eccentric shaft is higher, it is possible to before quenching, first carry out carburizing, improve the hardness of eccentric shaft.
Improving further, the quenching technical described in step 1) carries out in a vacuum, improves quenching effect.
The present invention has the beneficial effects that: devise a kind of heat treatment method for casting eccentric shaft, by repeated hardening and high tempering, improves the mechanical property of eccentric shaft.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention will be further described.
Eccentric shaft adopts 20Cr, carries out heat treatment according to following steps after casting:
1) carry out three quenchings, by repeated hardening, make eccentric shaft obtain required martensitic structure, improve the hardness of workpiece, intensity and wearability, get ready for rear road heat treatment.
1.1) first time quenching, heating-up temperature is 900-950 DEG C, oil quenching;
1.2) second time quenching, heating-up temperature is 850-900 DEG C, oil quenching or shrend;
1.3) third time quenching, heating-up temperature is 800-850 DEG C, shrend;
2) it is heated to 650-727 DEG C, vacant 5-10min, it is then placed in incubator and is slowly cooled to room temperature by air, rate of cooling is 5-10 DEG C/min.After steel part is through-hardened, reheats and carry out high temperature quenching, eliminate eccentric shaft produced stress when quenching, make steel part have outside high hardness and wearability
Improve further, advanced Carburization Treatment before the quenching technical described in step 1), if the hardness requirement of eccentric shaft is higher, it is possible to before quenching, first carry out carburizing, improve the hardness of eccentric shaft.
Improving further, the quenching technical described in step 1) carries out in a vacuum, improves quenching effect.
The concrete application approach of the present invention is a lot, and the above is only the preferred embodiment of the present invention, it should be pointed out that; for those skilled in the art; under the premise without departing from the principles of the invention, it is also possible to make some improvement, these improvement also should be regarded as protection scope of the present invention.

Claims (3)

1. a casting eccentric shaft heat treatment method, it is characterised in that comprise the following steps:
1) three quenchings are carried out;
1.1) first time quenching, heating-up temperature is 900-950 DEG C, oil quenching;
1.2) second time quenching, heating-up temperature is 850-900 DEG C, oil quenching or shrend;
1.3) third time quenching, heating-up temperature is 800-850 DEG C, shrend;
2) it is heated to 650-727 DEG C, vacant 5-10min, it is then placed in incubator and is slowly cooled to room temperature by air, rate of cooling is 5-10 DEG C/min.
2. casting eccentric shaft heat treatment method according to claim 1, it is characterised in that: advanced Carburization Treatment before the quenching technical described in step 1).
3. casting eccentric shaft heat treatment method according to claim 1, it is characterised in that: the quenching technical described in step 1) carries out in a vacuum.
CN201610355344.3A 2016-05-26 2016-05-26 Thermal treatment method of cast eccentric shaft Pending CN105779707A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610355344.3A CN105779707A (en) 2016-05-26 2016-05-26 Thermal treatment method of cast eccentric shaft

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610355344.3A CN105779707A (en) 2016-05-26 2016-05-26 Thermal treatment method of cast eccentric shaft

Publications (1)

Publication Number Publication Date
CN105779707A true CN105779707A (en) 2016-07-20

Family

ID=56379490

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610355344.3A Pending CN105779707A (en) 2016-05-26 2016-05-26 Thermal treatment method of cast eccentric shaft

Country Status (1)

Country Link
CN (1) CN105779707A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101487102A (en) * 2009-02-13 2009-07-22 深圳大学 Non-molybdenum non-nickel middle chrome wear resistant steel casting and heat treatment method thereof
CN101660165A (en) * 2009-09-28 2010-03-03 洛阳Lyc轴承有限公司 Heat treatment process of preparing bearing roller by using G20CrNi2MoA steel instead of G20Cr2Ni4A steel
CN102242322A (en) * 2011-06-29 2011-11-16 江苏环立板带轧辊有限公司 Improved 40CrNiMo steel and preparation method thereof
DE102011104400A1 (en) * 2011-06-16 2012-12-20 Daimler Ag Manufacturing a shaft, preferably crankshaft, eccentric shaft, balancing shaft, comprises producing the shaft made of a steel having carbon content, partially or completely carburizing a heavily loaded region, and locally hardening
CN103820705A (en) * 2012-11-19 2014-05-28 上海重型机器厂有限公司 Performance heat treatment method for SA508-3 large forging for nuclear power vessel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101487102A (en) * 2009-02-13 2009-07-22 深圳大学 Non-molybdenum non-nickel middle chrome wear resistant steel casting and heat treatment method thereof
CN101660165A (en) * 2009-09-28 2010-03-03 洛阳Lyc轴承有限公司 Heat treatment process of preparing bearing roller by using G20CrNi2MoA steel instead of G20Cr2Ni4A steel
DE102011104400A1 (en) * 2011-06-16 2012-12-20 Daimler Ag Manufacturing a shaft, preferably crankshaft, eccentric shaft, balancing shaft, comprises producing the shaft made of a steel having carbon content, partially or completely carburizing a heavily loaded region, and locally hardening
CN102242322A (en) * 2011-06-29 2011-11-16 江苏环立板带轧辊有限公司 Improved 40CrNiMo steel and preparation method thereof
CN103820705A (en) * 2012-11-19 2014-05-28 上海重型机器厂有限公司 Performance heat treatment method for SA508-3 large forging for nuclear power vessel

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
周濂钊: "提高2Cr13钢低温性能的研究", 《热处理》 *

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Application publication date: 20160720