QPQ salt bath nitriding optimization treatment method and device through laser shock peening

A technology of laser shock strengthening and salt bath nitriding, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of low nitriding speed and shallow thickness of nitriding layer, and achieve faster nitriding layer The formation, short action time, and shorten the effect of nitriding time

Pending Publication Date: 2020-11-17
湖南申亿精密零部件股份有限公司
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Problems solved by technology

However, the low nitriding speed and the shallow thickness of the nitriding layer are a bottleneck restricting the technology, and it is necessary to explore and improve related technologies to improve the nitriding efficiency and the quality of the nitriding layer.

Method used

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  • QPQ salt bath nitriding optimization treatment method and device through laser shock peening
  • QPQ salt bath nitriding optimization treatment method and device through laser shock peening
  • QPQ salt bath nitriding optimization treatment method and device through laser shock peening

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[0033] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments. The following experimental examples and examples are used to further illustrate but not limit the present invention.

[0034] see figure 1 , the present invention provides a QPQ salt bath nitriding optimization treatment method for laser shock strengthening. After the workpiece (not shown) to be processed is clamped by a clamping device, the clamping device is driven to run along the traveling track, thereby making The workpieces to be processed are sequentially carried out in each part of the process of QPQ salt bath nitriding along the direction of the track, so as to realize the QPQ salt bath nitriding treatment of the workpieces. Specifically include the following steps:

[0035] Step S10, pretreatment, using a laser device to perform impact strengthening treatment on the workpiece to be processed, so that dislocations and subgrain boundary change...

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Abstract

The invention discloses a QPQ salt bath nitriding optimization treatment method through laser shock peening. The QPQ salt bath nitriding optimization treatment method comprises the following steps that shock peening treatment is conducted on a workpiece by using a laser device to enable the surface of the workpiece to be dislocated; the workpiece is deoiled, cleaned and dried; the workpiece is putinto a preheating furnace for preheating; the workpiece is put into a direct-current electric field salt bath nitriding furnace, wherein the temperature in the furnace is 500-580 DEG C; the temperature is reduced to 400-450 DEG C for oxidation treatment, and the workpiece is taken out to be cleaned so as to remove CN<-> or CNO<->; the surface of the workpiece is polished; the workpiece is put into the direct-current electric field salt bath nitriding furnace, oxidation treatment is conducted on the workpiece again at the temperature of 300-400 DEG C, and the workpiece is cleaned to remove CN<-> or CNO<->; drying is conducted; and oil immersion is conducted. Compared with the prior art, the QPQ salt bath nitriding optimization treatment method has the advantages that the nitriding efficiency and the nitriding layer thickness are improved, and energy conservation and high efficiency are realized. The invention further provides a QPQ salt bath nitriding optimization treatment device.

Description

technical field [0001] The invention relates to the technical field of metal element manufacturing and processing, in particular to a QPQ salt bath nitriding optimization treatment method and device through laser shock strengthening. Background technique [0002] QPQ (Quench-Polish-Quench) technology is a metal surface modification technology, which originally meant quenching-polishing-quenching. It can significantly improve the wear resistance and service life of metal parts, and has many advantages such as low nitriding temperature, uniform nitriding layer, and environmental protection. [0003] In QPQ technology, its main process is salt bath nitriding (salt bath nitrocarburizing) + salt bath oxidation. However, the low nitriding speed and the shallow thickness of the nitriding layer are a bottleneck restricting this technology. It is necessary to explore and improve related technologies to improve the nitriding efficiency and the quality of the nitriding layer. [0004...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/58C23C8/02C21D10/00
CPCC23C8/58C23C8/02C21D10/005
Inventor 周海建王浩凌
Owner 湖南申亿精密零部件股份有限公司
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