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根据光内同轴送粉激光快速成形工艺,建立了扭曲薄壁件激光熔覆成形温度场瞬态有限元数值模型,模拟了扭曲薄壁件激光快速成形过程的温度场演变过程,分析了扭曲薄壁件熔覆成形过程中定点温度的热循环,通过仿真实时控制模型中输入激光功率的大小,模拟得到了保持熔池温度稳定时激光功率的变化值;通过层高控制调节激光器功率,控制熔池的温度稳定,成功熔覆成形了扭曲薄壁件。性能分析表明:成形件表面光滑,没有粘粉,尺寸与设计数值基本相同,组织细小致密,与基体形成冶金结合,且成形件硬度较高。
According to the coaxial laser powder rapid prototyping process, the transient finite element model of temperature field in laser cladding forming of distorted thin-walled parts was established. The evolution of temperature field in laser rapid prototyping was simulated. The heat cycle of fixed-point temperature during the process of thin-walled cladding cladding was simulated. By changing the input laser power in the simulation model, the variation of laser power was obtained when the temperature of the molten pool was kept stable. The laser power was controlled by layer height control The temperature of the bath was stable and the cladding formed a twisted thin-walled part. The performance analysis shows that the surface of the shaped part is smooth and free from sticky powder. The size and design values are basically the same. The microstructure is compact and compact, metallurgically bonded with the base body, and the hardness of the shaped part is high.