激光熔覆工艺参数对金属成形效率和形状的影响

针对激光熔覆再制造装备零件的快速高效熔覆成形及其控形问题,采用1kW全固态激光器和铁基合金粉末进行了不同激光线能量和送粉量下单道熔覆对比实验,研究了激光功率、激光扫描速度和送粉量等主要工艺参数对熔覆线形状尺寸和金属成形效率的影响.结果表明:熔覆线的宽度是光斑直径、激光功率、激光扫描速度和送粉量的函数,随激光功率增加和激光扫描速度降低,熔宽增加;随送粉量增加熔高增大.成形效率随工艺参数变化具有复杂的变化趋势,随激光线能量增加和送粉量增加,成形效率一般增高.在合适的参数范围内,需要对工艺参数进行优化以获得较高的成形效率.

Effect of laser cladding processing parameters 0n metal forming efficiency and geometry

In order to improve the forming efficiency and geometry control of laser cladding remanufacturing,The experiment of single channel cladding were compared by using 1kW all solid-state laser and Fe-based alloy powder under different cladding tracks and powder feed rates.The main process parameters,such as laser power,laser scanning speed and powder feed rate,which affected laser cladding geometry and efficiency were experimental researched.A model characterizing the relationship between width of cladding layer and process parameters was built.The results show that:With the increasing of laser power and the decreasing of scanning speed,the cladding width increases.The thickness of cladding layer gets higher with the increasing of powder feed rate.Although there is a complex relationship between forming efficiency and laser remanufacturing process,a significant increment of efficiency would be obtained when laser output energy increased or powder feed rate increased.To obtain higher forming efficiency,process parameter should be optimized.