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Local annealing method for air conditioner bearing lining

A bearing inner sleeve and partial annealing technology, which is applied in the improvement of process efficiency, furnace type, furnace, etc., can solve the problem of affecting the annealing softening effect and overall performance of the ring, affecting the bearing performance and service life, and reducing the hardness of the bearing working surface, etc. Problems, to meet the requirements of the bearing installation locking torque, improve the uniformity of the organization, and eliminate the effect of internal stress

Inactive Publication Date: 2016-09-07
ANQING YINTAI BEARING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the control of heating temperature and heat conduction speed directly affects the annealing softening effect and overall performance of the ferrule.
When the heating temperature is high, it is beneficial to the uniform annealing and softening of the screw hole and the surrounding area, but the high conduction effect of heat in the high carbon steel will affect the raceway of the ring at the same time, resulting in a decrease in the hardness of the bearing working surface, affecting the performance and service life of the bearing; If the heating temperature is low, the ideal softening effect cannot be obtained

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A local annealing method for an air-conditioning bearing inner sleeve, comprising the following steps:

[0017] a. Heat the threaded part of the bearing inner sleeve with a high-frequency induction heater. The high-frequency induction heater wraps the outer periphery of the bearing inner sleeve through an annular heating tube, and immerses other parts of the bearing inner sleeve in cooling water. The high-frequency induction heater Heat to 700°C, keep warm for 2 hours, and keep the water temperature at 10°C;

[0018] b. Then heat the high-frequency induction heater to 850°C, keep it warm for 10 hours, and keep the water temperature at 15°C;

[0019] c. Put all the bearing inner sleeves into cooling water and cool for 2 hours;

[0020] d. Then use a high-frequency induction heater to heat the threaded part of the bearing inner sleeve to 800°C at 20°C / h, keep it warm for 2 hours, and then take it out and air cool it to room temperature.

Embodiment 2

[0022] A local annealing method for an air-conditioning bearing inner sleeve, comprising the following steps:

[0023] a. Heat the threaded part of the bearing inner sleeve with a high-frequency induction heater. The high-frequency induction heater wraps the outer periphery of the bearing inner sleeve through an annular heating tube, and immerses other parts of the bearing inner sleeve in cooling water. The high-frequency induction heater Heat to 750°C, keep warm for 2 hours, and keep the water temperature at 10°C;

[0024] b. Then heat the high-frequency induction heater to 880°C, keep it warm for 10 hours, and keep the water temperature at 20°C;

[0025] c. Put all the bearing inner sleeves into cooling water and cool for 2 hours;

[0026] d. Then use a high-frequency induction heater to heat the threaded part of the bearing inner sleeve to 830°C at 20°C / h, keep it warm for 2 hours, and then take it out and air cool it to room temperature.

Embodiment 3

[0028] A local annealing method for an air-conditioning bearing inner sleeve, comprising the following steps:

[0029] a. Heat the threaded part of the bearing inner sleeve with a high-frequency induction heater. The high-frequency induction heater wraps the outer periphery of the bearing inner sleeve through an annular heating tube, and immerses other parts of the bearing inner sleeve in cooling water. The high-frequency induction heater Heat to 800°C, keep warm for 2 hours, and keep the water temperature at 15°C;

[0030] b. Then heat the high-frequency induction heater to 900°C, keep it warm for 10 hours, and keep the water temperature at 30°C;

[0031] c. Put all the bearing inner sleeves into cooling water and cool for 3 hours;

[0032] d. Then use a high-frequency induction heater to heat the threaded part of the bearing inner sleeve to 850°C at 20°C / h, keep it warm for 3 hours, and then take it out and air cool it to room temperature.

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PUM

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Abstract

The invention discloses a local annealing method for an air conditioner bearing lining. The local annealing method comprises the following steps that a, the part containing a thread of the bearing lining is heated through a high-frequency induction heater which wraps the periphery of the bearing lining through an annular heating pipe, the other parts of the bearing lining are immersed into cooling water, the high-frequency induction heater is heated to 700 DEG C-800 DEG C, heat is preserved for 2 h, and the water temperature is maintained to be 5 DEG C-15 DEG C; b, the high-frequency induction heater is heated to 850 DEG C-900 DEG C, the heat is preserved for 10 h, and the water temperature is maintained to be 5 DEG C-30 DEG C; c, the bearing lining is completely put into the cooling water and cooled for 2-3 h; and d, the part containing the thread of the bearing lining is heated to 800 DEG C-850 DEG C at the speed of 20 DEG C / h through the high-frequency induction heater again, subjected to heat preservation for 2-3 h and then taken out to be subjected to air cooling to the normal temperature. According to the local annealing method for the air conditioner bearing lining, the situation that a threaded hole and a certain range of the periphery of the threaded hole are partially softened is achieved, and the torque requirements for the bearing installing and locking are met.

Description

technical field [0001] The invention belongs to the field of annealing of air-conditioning bearings, and more specifically, the invention relates to a local annealing method of an inner sleeve of an air-conditioning bearing. Background technique [0002] For bearing inner sleeves with screw holes, the screw holes are usually processed before heat treatment and quenched together with the inner sleeve to about HRC60. In order to meet the hardness requirements of the screw holes, the periphery of the screw holes is usually partially softened after overall quenching. At present, the local annealing method of high-frequency induction heating is widely used. Through the induction heating and conduction of the ring heating ring around the screw hole on the outer surface of the workpiece, the screw hole and its axial ring cylinder are softened to reduce the hardness. Purpose. However, the control of heating temperature and heat conduction speed directly affects the annealing soften...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/26C21D1/18C21D1/42C21D9/40
CPCC21D1/18C21D1/26C21D1/42C21D9/40Y02P10/25
Inventor 邱兴忠杨高举杨华剑
Owner ANQING YINTAI BEARING