激光工艺参数对H13钢粉末单道成形特性的影响

Influence of laser remanufacturing process parameters on single-pass forming characteristics of H13 steel powder

为了解激光工艺参数对H13钢表面再制造成型H13粉末层几何特征的影响规律,设计研究了工艺参数(激光功率、光斑直径)对单道成形层几何特征(成形层高度、宽度、基体熔化深度与宽度)影响的实验,根据实验结果归纳了工艺参数对成形层几何特征的影响规律,并采用极差分析了各几何特征的主要影响因素,同时利用了激光再制造形成层几何特征模型对实验结果进行了分析。结果表明光斑尺寸对熔覆层宽度、基体熔化区宽度、深度影响更明显,而激光功率、光斑尺寸对熔覆层高度的影响无显著差别;此外,粉末综合利用率随辐照激光能量密度的增大先增大后维持基本不变。

In order to understand the influence of laser process parameters on the geometric characteristics of the H13 powder layer remanufactured on the surface of H13 steel,a experiment is designed to explore the influence of laser power and laser spot size on single cladding layer′s geometric characteristics,including the height and width of the cladding layer,the depth and width of the melting pool.The effects of these process parameters on cladding layer′s geometric characteristics are concluded.The main influence factors of each geometric feature are analyzed by the range analysis method.A mathematical model of laser cladding layer′s geometric characteristics is used to validate the results of the experiments.The experiment results show that the laser spot size is the parameter with more obvious effects on the width of cladding layer,the width and depth of matrix melting zone,while the influence of laser power and spot size on the clad height has no significant difference;in addition,the comprehensive utilization rate of powder first increases and then remains unchanged with the increase of laser energy density.