应用激光, 2016, 36 (1): 29, 网络出版: 2016-03-28
数值模拟解决激光熔覆成形有角度薄壁件的效率问题
Simulation to Solve the Efficiency Problem of Inclined Thin-walled Parts Made by Laser Cladding Forming
激光熔覆成形 有角度薄壁件 温度场模拟 应力场模拟 laser cladding forming inclined thin-walled parts temperature field simulation stress field simulation
摘要
为了解决激光熔覆近净成形薄壁零件易开裂问题和倾斜零件的效率问题, 采用温度场和应力场数值模拟及工艺实验相结合的方法, 使用316L不锈钢粉末进行了有角度薄壁件的激光熔覆近净成形。研究结果表明, 连续成形不仅会导致薄壁零件成形区域温度过高引起塌陷及过熔现象, 而且残余应力会超过材料屈服强度, 造成薄壁零件开裂; 连续熔覆5层后再冷却10 min的工艺措施不仅可以有效降低成形区域温度, 保证初始成形条件相对稳定, 而且避免了逐层冷却, 提高了成形效率; 制备的有角度薄壁件层间界限分明、表面平整。
Abstract
To prevent the low precision and efficiency of laser cladding forming, the temperature field and stress field simulation were used to simulate the processing of 316L stainless steel inclined thin-walled parts. The results show that continuous laser cladding forming of the thin-walled parts will not only give rise to collapse and over-temperature melting phenomenon, but also will lead to crack if the residual stresses exceed the yield strength of the material. The stress field results show that the matrix residual stresses is lower than the material yield strength when the continuous forming layers is 5, the temperature field results show that the current temperature will not surpass the settled matrix temperature when the cooling time is 10 min. The above resolve plans of the inclined thin-wall parts forming not only avoid the cooling layer by layer and improve the forming efficiency, but also ensure the initial forming conditions’ stability, and the inclined thin-wall parts are successfully manufactured.
马婧, 齐海波, 赵衍庆, 郭腾达. 数值模拟解决激光熔覆成形有角度薄壁件的效率问题[J]. 应用激光, 2016, 36(1): 29. Ma Jing, Qi Haibo, Zhao Yanqing, Guo Tengda. Simulation to Solve the Efficiency Problem of Inclined Thin-walled Parts Made by Laser Cladding Forming[J]. APPLIED LASER, 2016, 36(1): 29.