Ultrafast Laser Precision Machining of Dry Gas Seal Based on Ordered Texture Design
WANG Yan1, WANG Yingyao1, XIAO Yufeng1, HU Qiong1, ZHAO Quanzhong2,3, FU Qiang2,4
1 School of Mechanical Engineering, Jiangsu Ocean University, Lianyungang 222005, Jiangsu, China 2 State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, the Chinese Academy of Sciences, Shanghai 201800, China 3 Nanjing Institute of Advanced Laser Technology, Nanjing 210038, China 4 Nanjing Cuizhi Laser Application Technology Research Institute Co., Ltd., Nanjing 210038, China
Abstract: The core technology of dry gas seals lies in the processing of micro-level grooves. The theoretical required depth hg is 3—10 μm and roughness of seal grooves Ra is ≤ 0.8 μm. Currently, laser processing is the mainstream slotting method, but the actual processing accuracy differs from theoretical research, affecting the actual implementation of dry gas seal. In this study, by employing an ultra-fast laser processing technology and using silicon carbide (SiC) as the experimental object, the precision machining of the groove with a fluctuating range of 2 μm in groove depth and a maximum roughness of 0.59 μm is realized. An ultra-fast laser precision machining process idea based on the benchmark of minimum laser energy corresponding to the gasification threshold of the material is proposed. Meanwhile, based on the orderly modeling design method, an orderly modeling groove structure with good orderliness and high regularity is obtained, as well as a maximum error of 2.5% in micro-scale texture spacing. This technology shortens the processing time by approximately 30% compared with the traditional process method, and realizes a low-cost, high-efficiency, and orderly modeling laser-directed processing technology suitable for practical industrial applications. A qua-lity inspection and evaluation method based on the mean square error of average multiple random inspections under the same inspection method is proposed. This method can scientifically confirm the quality and depth of slotting with dry gas seals. The research results can provide theoretical and technical support to further improve the processing and manufacturing level of dry gas seals and reduce costs.
王衍, 王英尧, 肖喻丰, 胡琼, 赵全忠, 付强. 基于有序造型设计的干气密封超快激光精密加工[J]. 材料导报, 2022, 36(5): 20120238-9.
WANG Yan, WANG Yingyao, XIAO Yufeng, HU Qiong, ZHAO Quanzhong, FU Qiang. Ultrafast Laser Precision Machining of Dry Gas Seal Based on Ordered Texture Design. Materials Reports, 2022, 36(5): 20120238-9.
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