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Thermal treatment method for roller pins

A heat treatment method and needle rolling technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve problems such as reduced hardness of needle rollers, insufficient high temperature resistance of needle rollers, damage, etc., achieve high temperature dimensional stability, and improve service life Effect

Inactive Publication Date: 2015-11-18
新昌县大市聚正好轴承厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the needle roller is SUJ2 or GCr15 bearing steel fully hardened type, and the needle roller has insufficient high temperature resistance: it can be used normally at a temperature lower than 120°C, and can be used normally at a temperature below 150°C for a short time.
If it is used above 150°C for a long time, high-temperature annealing will occur, resulting in a decrease in the hardness of the needle roller. After the hardness is reduced, the needle roller will be worn out and become invalid.
If the needle roller is to be used in an environment with a temperature higher than 180°C, the hardness of the needle roller can only be reduced and damaged

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] a. Place the workpiece in an environment of 840°C for preheating, and the preheating time is 5 minutes;

[0020] b. Heat the workpiece to 1100°C and keep it warm for 10 minutes;

[0021] c. Cool the workpiece to normal temperature, and the residence time in the normal temperature stage is: 30min;

[0022] d. Temper the workpiece 3 times, the tempering temperature is 500°C, and the tempering time is 1.8h each time;

[0023] e. Cool down to room temperature each time after tempering, and the residence time at room temperature is 30 minutes.

Embodiment 2

[0025] a. Place the workpiece in an environment of 860°C for preheating, and the preheating time is 8 minutes;

[0026] b. Heat the workpiece to 1110°C and keep it warm for 20 minutes;

[0027] c. Cool the workpiece to normal temperature, and the residence time in the normal temperature stage is: 100min;

[0028] d. Temper the workpiece 3 times, the tempering temperature is 530°C, and the tempering time is 2 hours each time;

[0029] e. Each tempering and cooling to normal temperature, the residence time in the normal temperature stage is: 100min.

Embodiment 3

[0031] a. Place the workpiece in an environment of 880°C for preheating, and the preheating time is 10 minutes;

[0032] b. Heat the workpiece to 1120°C and keep it warm for 30 minutes;

[0033] c. Cool the workpiece to normal temperature, and the residence time in the normal temperature stage is: 210min;

[0034] d. Temper the workpiece 3 times, the tempering temperature is 560°C, and the tempering time is 2.2 hours each time;

[0035] e. Each tempering and cooling to normal temperature, the residence time in the normal temperature stage is: 210min.

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PUM

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Abstract

The invention relates to a thermal treatment method for roller pins. The thermal treatment method is characterized by comprising the methods that firstly, workpieces are placed in the environment at the temperature ranging from 800 DEG C to 900 DEG C and preheated, and the preheating time ranges from 5 min to 10 min; secondly, the workpieces are heated to 1000-1200 DEG C and subjected to heat preservation for 8 min to 35 min; thirdly, the workpieces are cooled to the normal temperature, and the holding time at the normal temperature stage ranges from 30 min to 210 min; fourthly, the workpieces are subjected to tempering for three times, the tempering temperature ranges from 450 DEG C to 600 DEG C, and the tempering time every time ranges from 1.5 h to 2.5 h; and fifthly, the workpieces are cooled to the normal temperature after being subjected to tempering every time, and the holding time at the normal temperature stage ranges from 30 min to 210 min. The roller pins produced through the thermal treatment method have high-temperature size stability, high-temperature hardness and high-temperature contact fatigue durability; the problem of high-temperature adhesion damage to a needle roller bearing at the big end of a connecting rod of a motor tricycle at a low speed and a high load is solved, and the service life of the needle roller bearing is prolonged.

Description

technical field [0001] The invention relates to a heat treatment method for needle rollers. Background technique [0002] At present, the needle roller is SUJ2 or GCr15 bearing steel fully hardened type, and the needle roller has insufficient high temperature resistance: it can be used normally at a temperature lower than 120°C, and can be used normally at a temperature below 150°C for a short time. If it is used above 150°C for a long time, high-temperature annealing will occur, resulting in a decrease in the hardness of the needle roller. After the hardness is reduced, the needle roller will wear out and become invalid. If the needle roller is to be used in an environment with a temperature higher than 180°C, the hardness of the needle roller can only be reduced and damaged. Contents of the invention [0003] In view of the problems existing in the prior art, the object of the present invention is to provide a technical solution for a heat treatment method for needle ro...

Claims

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Application Information

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IPC IPC(8): C21D9/26
Inventor 王鑫
Owner 新昌县大市聚正好轴承厂
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