选区激光熔化的微流道换热器芯体传热板成型工艺

Forming process of heat transfer plate for micro-channel heat exchanger core using selective laser melting

为解决传统工艺存在的截面形状受限、污染环境等问题,研究采用选区激光熔化技术制备高通量微流道换热器芯体传热板.分析传热板的几何形状、316L不锈钢粉末的材料特性及主要成型工艺参数,采用Altair Inspire软件的Print3D模块对成型过程进行仿真模拟,研究温度场、Mises应力和塑性应变的分布及变化规律.结果表明:熔化成型区温度随着激光的射入和远离发生剧烈变化;由于激光能量在制件内的累积效应,使得后成型区域的温度明显大于先成型区域.Mises应力和塑性应变与换热板的结构和温度场有密切关系,流道位置结构复杂,Mises应力和塑性应变较大;温度越高的区域金属粉末熔化越充分,Mises应力和塑性应变的值越小.

Selective laser melting has been introduced into the production of core plate of micro-channel heat exchanger to solve the problem of restricted cross-section topology and environmental pollution in traditional processes.Having examined the shape of the plate,the properties of 316L stainless steel and the main param-eters of the process,the Print3D model of the Inspire software was used to simulate the entire forming process in order to learn the distribution and change of the temperature,the Mises stress and the plastic strain.The re-sults show that the temperature of the fused field fluctuated violently with the present and absence of laser,and due to the cumulative effect of laser energy in the fabricated part,the temperature in latter formed region is much higher than the previous one.The Mises stress and plastic strain are closely related to the structure and temperature field of the plate.The complex structure of the runner makes larger Mises stress and plastic strain;and the higher temperature cause fully melted powder,which release the Mises stress and plastic strain.