China's progress in heat treatment production technology

Laser and electron beam heat treatment

The experimental study of laser heat treatment began in 1979. Initially, a small sample was used on a 250W low-power laser to verify the effect of phase hardening on the steel surface. At present, carbon dioxide lasers can achieve 10kW power, and lasers, light guiding focusing systems and 5-coordinate worktables can be manufactured by themselves.

Experimental studies on phase transformation hardening, melt solidification, surface coating and surface alloying of laser and electronic surfaces have been carried out. Laser phase transformation hardening is applied to machine parts such as automobile engine cylinder liners, elastic coupling main reeds, textile machine spindles, gauge block gauges, rock drill cylinders and other machine parts. FAW, Second Automobile, Beijing Internal Combustion Engine Plant and Xi'an Internal Combustion Engine Parts Factory have all established laser hardening production lines for cylinder liners.

Over the past decade, there have been more than a dozen high-power CO2 lasers imported from abroad. At present, domestically produced equipment has basically replaced imports.

The development and production units of high-power lasers include Huazhong University of Science and Technology, Shanghai Institute of Optics and Mechanics, Shenyang Electromechanical Design Institute, and Beijing Institute of Automation of Chinese Academy of Sciences. The units that have undertaken national 863 scientific research projects and contributed to the application of laser heat treatment include Shenyang Metal Institute, Beijing Machine Tool Institute, Beijing Mechanical and Electrical Research Institute, Beijing Mechanical and Electrical Institute of the former Ministry of Machinery, and Changchun Machinery Research Institute. The Beijing Institute of Mechanical and Electrical Engineering of the former Ministry of Machinery and the Institute of Automation of the Chinese Academy of Sciences jointly developed a 15KW electron beam heat treatment device.

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