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Spring heat treatment method

A heat treatment method and normalizing treatment technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve problems affecting the quality and life of springs, and achieve the effects of prolonging service life, easy temperature control, and simple process

Inactive Publication Date: 2018-03-16
XUZHOU SANHE MACHANICAL PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And tempering only eliminates the thermal stress that occurs during quenching, which affects the quality and life of the spring.

Method used

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Embodiment Construction

[0016] In order to make the content of the present invention more clearly understood, the following will clearly and completely describe the technical solutions in the embodiments of the present invention.

[0017] A spring heat treatment method, comprising the steps of:

[0018] (1) Annealing and normalizing treatment: put the spring in an iron box, put it in an incubator-type resistance furnace for heating and annealing, the annealing temperature is 860~880°C, keep it warm for 4 hours, after keeping it warm, take the iron box out of the furnace , air cooled to room temperature;

[0019] (2) Quenching: After heat preservation, take out the iron box from the heating furnace, open the box, take out the spring for quenching, and the quenching temperature is 350~400°C;

[0020] (3) Tempering for the first time: take it out of the oil and then temper it. The heating temperature is 380°C, keep it warm for 20 minutes, take it out of the furnace, and air cool it to room temperature;...

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Abstract

The invention relates to a spring heat treatment method, which comprises the following steps of (1) annealing and normalizing: putting a spring into an iron box, putting the iron box into a temperature box type electric resistance furnace for carrying out heating and annealing at the temperature of 860 to 880 DEG C, keeping warm for 4h, taking the iron box out of the furnace after keeping warm, and air cooling to the room temperature; (2) quenching: after keeping warm, taking the iron box out of a heating furnace, opening the box, and taking the spring out for quenching at the temperature of 350 to 400 DEG C; (3) tempering for the first time: taking out from oil and tempering, wherein the heating temperature is 380 DEG C, and the warm keeping time is 20min; taking out from the furnace, andair cooling to the room temperature; (4) tempering for the second time: after cooling, tempering for the second time, wherein the temperature is 520 to 540 DEG C, and the warm keeping time is 60min;(5) cooling: after tempering, adopting a fast cooling manner such as water cooling or air cooling for preventing temper embrittlement. The spring heat treatment method provided by the invention is simple in process, the temperature is easy to control, and through the treatment method, the hardness, the toughness and the fatigue resistance of a springsheet can be improved, and the service life of the spring is prolonged.

Description

technical field [0001] The invention relates to mechanical heat processing, in particular to a spring heat treatment method. Background technique [0002] Spring heat treatment methods generally include preheating, heating, heat preservation, cooling, tempering heat preservation, and cooling. The quenching temperature of spring steel is generally about 450 degrees Celsius. If the temperature and holding time are not well controlled, the final result is that the ferrite cannot be completely dissolve. And tempering only eliminates the thermal stress that occurs during quenching, which affects the quality and life of the spring. Contents of the invention [0003] The invention provides a spring heat treatment method, which is convenient, quick and easy to operate. [0004] In order to achieve the above-mentioned purpose of the invention, the technical scheme adopted in the present invention is: [0005] A spring heat treatment method, comprising the steps of: [0006] (1)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/02C21D1/26C21D1/18
CPCC21D9/02C21D1/18C21D1/26
Inventor 戴杰
Owner XUZHOU SANHE MACHANICAL PARTS