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Workpiece surface intensifying method by laser micro processing

A workpiece surface and micro-processing technology, which is applied in the field of laser strengthening treatment of the workpiece surface, can solve the problems of low hardness and wear resistance, hinder cracks, etc., and achieve improved wear resistance, small heat-affected zone, quenching stress and deformation small effect

Inactive Publication Date: 2014-03-12
JIANGSU UNIV
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  • Application Information

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Problems solved by technology

However, this method is only suitable for non-smooth workpiece surfaces, and the hardness and wear resistance of the surface materials in the non-treatment area are not high, and it cannot effectively prevent the initiation of cracks in the non-treatment area.

Method used

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  • Workpiece surface intensifying method by laser micro processing
  • Workpiece surface intensifying method by laser micro processing
  • Workpiece surface intensifying method by laser micro processing

Examples

Experimental program
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Embodiment Construction

[0024] like figure 1 and figure 2 As shown, the 45# steel automotive LED headlight workpiece. Place the workpiece on the five-axis linkage workbench, position it and clamp it with a fixture device: use alcohol degreasing and decontamination solvent to remove oil and rust on the surface of the workpiece; use a spray gun or brush to evenly coat SiO2 light-absorbing paint on the surface of the workpiece Above; adjust the parameters (laser power, scanning speed) and spot diameter of laser 1, where the laser energy emitted by laser 1 is 800w, the scanning speed is 7mm / s, the spot diameter is 10mm, and the overlap rate is 70%, which is good for the workpiece surface Carry out overall quenching; clean the surface of the workpiece and apply black paint after drying; adjust the parameters of laser 4 (laser power, scanning speed) and spot diameter, where the laser energy emitted by laser 1 is 20J, the pulse width is 50ns, and the spot diameter is 3mm. The connection rate is 50%, K9 o...

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Abstract

The invention relates to a method for intensifying the surface of a workpiece by lasers. The surface of the workpiece is subjected to integral laser quenching, and thus the crystalline grains of the workpiece are refined to a certain extent; the surface of the workpiece is subjected to partial laser grid intensification, the hardness of an intensification region is improved further, and the crystalline grains are refined further; the crystalline grains on the intensified surface of the workpiece is refined, so that the workpiece material is in isotropy, and the large interface causes dislocation to avoid piling up; during the service life of the workpiece, not only is the stress concentration alleviated greatly, but also the fatigue crack growth is hindered, and the plasticization is intensified. Additionally, the crystalline grain size in a non-intensified region is greater than the average crystalline grain size in an intensified region, the dislocation distribution is random, and the crystalline grain arrangement of the non-intensified region is widely different from the compact crystalline grain arrangement in the intensified region, so that a crack interference fringe is formed between the non-intensified region and the intensified region, and a fatigue crack can be effectively prevented from growing.

Description

technical field [0001] The invention relates to the technical field of material processing and laser processing applications, in particular to a method for applying laser strengthening to treat the surface of a workpiece. Background technique [0002] With the rapid development of my country's automobile and home appliance industries, higher requirements are put forward for the workpiece industry. How to improve the processing quality and service life of workpieces has always been a subject of continuous exploration. The surface strengthening technology is gradually becoming an important way to improve the quality and service life of workpieces due to its wide functionality, good environmental protection and huge efficiency. The surface strengthening treatment of the workpiece refers to the use of mechanical, physical and chemical methods to modify and cover the working surface of the workpiece, so that the workpiece not only has higher strength, hardness and wear resistance...

Claims

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Application Information

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IPC IPC(8): C21D1/09
Inventor 任旭东刘帆帆郭伟刚杜正清周水琴李慧敏随赛陈加明
Owner JIANGSU UNIV
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