Multi-phase cooling method and device for bearing surface laser quenching

A technology of laser quenching and cooling method, which is applied in the direction of quenching device, furnace type, furnace, etc., can solve the problems of self-tempering, decrease of steam film cooling capacity, deformation accuracy, etc., to reduce the impact of hardness, reduce impact, and reduce deformation volume effect

Pending Publication Date: 2022-03-25
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of deformation and precision in conventional heat treatment methods, the self-tempering problem

Method used

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  • Multi-phase cooling method and device for bearing surface laser quenching
  • Multi-phase cooling method and device for bearing surface laser quenching
  • Multi-phase cooling method and device for bearing surface laser quenching

Examples

Experimental program
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Example Embodiment

[0021] Example 1: Metal blocks were made of copper, and water was selected for water, and the inert gas was nitrogen.

[0022] Such as figure 1 As shown, a bearing surface laser quenching cooling device can be used in the bearing inner roller to carry out laser quench cooling, including bearing 4, nozzle 7, and thermally conductive copper block 22. The thermally conductive copper block 22 is fixed to the table 14 by the strut 13, and adjust the height of the table to maintain the contact of the copper block and the bearing; the heat conductive copper block 22 and the pump 19, the water tank 11 passes through the copper block water pipe 21, the second liquid throttle The valve 20, the total water supply pipe 15, the copper block water pipe 10 performs a connection to form a circulating waterway, which can continuously cool down the thermally conductive copper block; the laser is fixed, the laser spot irradiation position 26 is fixed, the bearing drives rotation through the turning ...

Example Embodiment

[0024] Example 2: Metal blocks were made of copper, and water was selected for water, and the inert gas was nitrogen.

[0025] A bearing surface laser quenching cooling device, such as figure 2As shown, it can be used to carry out laser quench cooling outside the bearing. The structure is substantially the same as that in the first embodiment, but the mounting position of the nozzle 7 or the like is different. The laser irradiation position 26 is located at the outer roller, the water mist and nitrogen discouraged by the spray head 7, and the heat-conducting copper block that keeps three-sided contact with the bearing can improve the extraction of heat from the bearing, thereby reducing the heating area. The temperature gradient, controller 29, the closed loop control of the pump 19 can ensure the stability of the cooling process to ensure uniformity of the surface hardness distribution. Copper blocks can reduce the degree of surface from the surface. By combining the water mist, ...

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Abstract

The invention discloses a multiphase cooling method and device for bearing surface laser quenching, and the multiphase cooling device comprises a gas generation device, a liquid circulation generation device, a working table, four supporting columns, a heat conduction metal block, a supporting plate, a spring, a screw rod and a spray head, the heat conduction metal block is supported on the working table through the four supporting columns; a mounting groove matched with the bearing is formed in the heat-conducting metal block, a liquid inlet and a liquid outlet are formed in the two sides of the heat-conducting metal block, the spray head is mounted on the supporting plate through a screw rod, the stud is sleeved with a spring, the supporting plate is fixed to the mounting groove of the heat-conducting metal block through a bolt, and a liquid spraying opening of the spray head right faces the bearing penetrating through the mounting groove; by adopting the cooling mode and the device, a fine structure can be obtained, and the influence of decarburization and oxidation on the surface of the hardening layer and self-tempering of the bearing on the hardness of the hardening layer is reduced, so that the hardness distribution of the hardening layer on the surface is more uniform, and the hardness is improved; a hardening layer with a more uniform bottom is obtained; and the overall deformation of the bearing is effectively reduced.

Description

technical field [0001] The invention relates to the field of bearing processing devices, in particular to a multiphase cooling method and device for laser quenching of bearing surfaces. Background technique [0002] Bearings are mainly used to support the rotary motion of the shaft, and require high dimensional accuracy and surface hardness. Generally, the surface of large-scale bearings is treated by high-frequency quenching, but the deformation after induction quenching heat treatment is relatively large, and self-tempering is prone to occur, thereby reducing the surface hardness. [0003] Laser quenching is a quenching technology that uses laser to heat the surface of the material above the phase transition point, and then cools it rapidly to harden the material phase transition. It has the characteristics of high surface hardness, small deformation of the workpiece, high processing accuracy, and no pollution in the processing process. However, the hardened layer obtaine...

Claims

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Application Information

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IPC IPC(8): C21D1/667C21D1/09C21D9/40C21D11/00
CPCC21D1/667C21D1/09C21D9/0062C21D9/40C21D11/005Y02P10/25
Inventor 陈智君张群莉姚建华张坤
Owner ZHEJIANG UNIV OF TECH
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