论文部分内容阅读
激光热处理可有效提高材料的使用性能。采用宽带扫描法可使温度分布更均匀 ,热处理引起的变形更小 ,同时减小下一道对前一道的热影响。介绍了激光宽带扫描装置 ,提出了多棱镜宽带扫描的扫描频率、扫描角度、扫描宽度、过剩聚焦长度的解析式。实验研究了扫描高度变化时 ,扫描宽度的变化情况 ,并与解析计算结果进行了对比分析。对SNCM2 2 0 ,SCM44 0两种钢采用 2 k W CO2 激光进行了宽带扫描热处理实验 ,结果表明 ,激光宽带扫描平均硬化宽度可达 15 .5 m m,SNCM2 2 0硬化宽度随行走速度提高减小较快 ,SCM44 0对行走速度则较不敏感。随行走速度提高 ,钢的硬化层厚度减小 ,硬度提高
Laser heat treatment can effectively improve the material's performance. Broadband scanning allows a more uniform temperature distribution, less distortion due to heat treatment, and reduces the thermal impact on the next one. A laser broadband scanning device is introduced and the analytical formula of scanning frequency, scanning angle, scanning width and excess focusing length of polygon wideband scanning is proposed. The change of scanning width when the scanning height changes is experimentally studied, and the comparison with the analytical calculation results is made. The results show that the average width of laser wideband scanning can reach 15.5 mm, and the width of SNCM2 20 hardening decreases with the increase of traveling velocity Faster, SCM44 0 is less sensitive to walking speed. Accompanying walking speed increased, the thickness of the hardened layer decreases, the hardness increases