CN104404219A - Spring heat treatment method - Google Patents

Spring heat treatment method Download PDF

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Publication number
CN104404219A
CN104404219A CN201410617023.7A CN201410617023A CN104404219A CN 104404219 A CN104404219 A CN 104404219A CN 201410617023 A CN201410617023 A CN 201410617023A CN 104404219 A CN104404219 A CN 104404219A
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CN
China
Prior art keywords
spring
quenching
temperature
tempering
heating
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
CN201410617023.7A
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Chinese (zh)
Inventor
钱文明
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.)
Wuxi Baishun Machinery Factory
Original Assignee
Wuxi Baishun Machinery Factory
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 Wuxi Baishun Machinery Factory filed Critical Wuxi Baishun Machinery Factory
Priority to CN201410617023.7A priority Critical patent/CN104404219A/en
Publication of CN104404219A publication Critical patent/CN104404219A/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
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/02Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for springs

Abstract

The invention provides a spring heat treatment method. The method comprises the following steps: 1, annealing and normalizing treatment: spheroidizing annealing and soft annealing treatment is carried out to the hardness of 225HBS or less; and 2, quenching and tempering treatment: the heating temperature of the quenching treatment is 350+(30~50)DEG C generally, the heating coefficient a in a salt bath furnace is 0.5min/mm, the heating coefficient in an air furnace is 1.2-2min/mm, oxidation decarburization is prevented in the heating of the air furnace, a rod-shaped suspender penetrates into the internal diameter of a spring during furnace charging, horizontal quenching is carried out to prevent the deformation of a screw workpiece, and an oil quenching medium is used by alloy steel as a quenching medium to carry out water oil quenching. The temperature control of the spring heat treatment method is easy, and the service life of the spring treated through the method is long.

Description

A kind of heattreatment of spring method
Technical field
The present invention relates to a kind of heattreatment of spring method, belong to machinery manufacturing technology field.
Background technology
Heattreatment of spring method is generally preheating, heating, insulation, cooling, tempering insulation, cooling, and the quenching temperature of spring steel is generally 450 degrees centigrade, if temperature and soaking time control bad, the consequence finally caused is that ferrite can not dissolve completely.And the thermal stresses occurred when quenching also just is eliminated in tempering, affect quality and the life-span of spring.
Summary of the invention
The invention provides a kind of heattreatment of spring method, the above defect can be overcome.
For solving above technical problem, the invention provides following technical scheme: a kind of heattreatment of spring method, comprises the steps: a, annealing and normalizing treatment: Spheroidizing Annealing and softening annealing process, hardness is at≤225HBS; B, quenching, temper: the Heating temperature of quench treatment, generally in 350+(30 ~ 50) DEG C; Heating coefficient a=0.5min/mm in salt bath furnace, the heating coefficient in air furnace is by 1.2 ~ 2min/mm; Prevent oxidation and decarbonization during air furnace heating, during shove charge, in spring inside diameter, penetrate shaft-like suspender, and level quench, prevent spiral workpiece deformation; When quenchant is selected, steel alloy uses oil quenching medium, uses water oil quenching; Select the tempering stove of band blower fan during temper, increase the homogeneity of tempering, the hardness of spring at 45 ~ 50HRC, sheet spring at 40 ~ 45HRC, tempering temperature between 400 ~ 500 DEG C, the following soaking time T of spring string diameter d=12mm (min)=30+3d; The above T of T spring string diameter d=12mm (min)=30+3d; Adopt water-cooled or air-cooled Cooling Mode after tempering, prevent temper brittleness;
C, bainite isothermal processes: the starting temperature Ms point according to martensitic transformation determines bainite isothermal temperature, and quenchant selects salt made from earth containing a comparatively high percentage of sodium chloride.
Carry out isothermal quenching to spring, tempering temperature is identical with austempering temperature.
This heattreatment of spring method that the present invention relates to, easy control temperature, and stronger for work-ing life through the spring of the method process.
Embodiment
A kind of heattreatment of spring method, comprises the steps: a, annealing and normalizing treatment: Spheroidizing Annealing and softening annealing process, and hardness is at≤225HBS; B, quenching, temper: the Heating temperature of quench treatment, generally in 350+(30 ~ 50) DEG C; Heating coefficient a=0.5min/mm in salt bath furnace, the heating coefficient in air furnace is by 1.2 ~ 2min/mm; Prevent oxidation and decarbonization during air furnace heating, during shove charge, in spring inside diameter, penetrate shaft-like suspender, and level quench, prevent spiral workpiece deformation; When quenchant is selected, steel alloy uses oil quenching medium, uses water oil quenching; Select the tempering stove of band blower fan during temper, increase the homogeneity of tempering, the hardness of spring at 45 ~ 50HRC, sheet spring at 40 ~ 45HRC, tempering temperature between 400 ~ 500 DEG C, the following soaking time T of spring string diameter d=12mm (min)=30+3d; The above T of T spring string diameter d=12mm (min)=30+3d; Adopt water-cooled or air-cooled Cooling Mode after tempering, prevent temper brittleness;
C, bainite isothermal processes: the starting temperature Ms point according to martensitic transformation determines bainite isothermal temperature, and quenchant selects salt made from earth containing a comparatively high percentage of sodium chloride.
Carry out isothermal quenching to spring, tempering temperature is identical with austempering temperature.
Embodiment of the present invention does not form the restriction to the application's scope; within every spirit in the present invention's design and principle, any amendment that one of skill in the art can make, equivalent to replace and improvement etc. all should be included within protection scope of the present invention.

Claims (2)

1. a heattreatment of spring method, is characterized in that: comprise the steps: a, annealing and normalizing treatment: Spheroidizing Annealing and softening annealing process, and hardness is at≤225HBS; B, quenching, temper: the Heating temperature of quench treatment, generally in 350+(30 ~ 50) DEG C; Heating coefficient a=0.5min/mm in salt bath furnace, the heating coefficient in air furnace is by 1.2 ~ 2min/mm; Prevent oxidation and decarbonization during air furnace heating, during shove charge, in spring inside diameter, penetrate shaft-like suspender, and level quench, prevent spiral workpiece deformation; When quenchant is selected, steel alloy uses oil quenching medium, uses water oil quenching; Select the tempering stove of band blower fan during temper, increase the homogeneity of tempering, the hardness of spring at 45 ~ 50HRC, sheet spring at 40 ~ 45HRC, tempering temperature between 400 ~ 500 DEG C, the following soaking time T of spring string diameter d=12mm (min)=30+3d; The above T of T spring string diameter d=12mm (min)=30+3d; Adopt water-cooled or air-cooled Cooling Mode after tempering, prevent temper brittleness;
C, bainite isothermal processes: the starting temperature Ms point according to martensitic transformation determines bainite isothermal temperature, and quenchant selects salt made from earth containing a comparatively high percentage of sodium chloride.
2. a kind of heattreatment of spring method according to claim 1, is characterized in that: carry out isothermal quenching to spring, tempering temperature is identical with austempering temperature.
CN201410617023.7A 2014-11-06 2014-11-06 Spring heat treatment method Pending CN104404219A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410617023.7A CN104404219A (en) 2014-11-06 2014-11-06 Spring heat treatment method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410617023.7A CN104404219A (en) 2014-11-06 2014-11-06 Spring heat treatment method

Publications (1)

Publication Number Publication Date
CN104404219A true CN104404219A (en) 2015-03-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410617023.7A Pending CN104404219A (en) 2014-11-06 2014-11-06 Spring heat treatment method

Country Status (1)

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CN (1) CN104404219A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105568131A (en) * 2015-12-31 2016-05-11 安徽红桥金属制造有限公司 Corrosion resistant spring steel and heat treatment process
CN110358893A (en) * 2019-07-25 2019-10-22 诸暨市裕荣弹簧有限公司 A kind of preparation process of scroll spring

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1900334A (en) * 2005-07-19 2007-01-24 上海核工碟形弹簧制造有限公司 High temperature resistant anti-corrosion disc-shaped spring
CN102888500A (en) * 2012-10-26 2013-01-23 国家电网公司 Heat treatment process of thermoforming spring

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1900334A (en) * 2005-07-19 2007-01-24 上海核工碟形弹簧制造有限公司 High temperature resistant anti-corrosion disc-shaped spring
CN102888500A (en) * 2012-10-26 2013-01-23 国家电网公司 Heat treatment process of thermoforming spring

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
中国机械工程学会热处理学会: "《热处理手册》", 31 January 2008, 机械工业出版社 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105568131A (en) * 2015-12-31 2016-05-11 安徽红桥金属制造有限公司 Corrosion resistant spring steel and heat treatment process
CN110358893A (en) * 2019-07-25 2019-10-22 诸暨市裕荣弹簧有限公司 A kind of preparation process of scroll spring

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Application publication date: 20150311