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采用最小二乘中线法建立基于成型粉末物性的表面粗糙度计算模型;选用选区激光熔化成型Ti6Al4V单熔道和零件,用表面粗糙度仪检测成型零件的表面粗糙度,光学显微镜观察、检测成型单熔道几何尺寸,分析所建模型理论值与实验值产生误差的原因。实验结果表明:激光重熔区对表面粗糙度计算模型精度影响较大,模型理论值与实验值的平均相对误差为5.7%,误差较小,模型具有实际工程应用价值。成型零件主要由α和β相组成,显微硬度为487.3HV0.3。
The calculation model of surface roughness based on the physical properties of the shaped powder is established by the least-square median method. The single-melting Ti6Al4V single-melt channel and parts are selected by laser melting and the surface roughness of the molded part is measured by a surface roughness meter. The geometry of the melt channel is analyzed and the reason why the theoretical value and the experimental value of the model are in error is analyzed. The experimental results show that the laser remelting area has a great influence on the accuracy of the surface roughness calculation model. The average relative error between the model theoretical value and the experimental value is 5.7%, and the error is small. The model has practical application value. Forming parts mainly by the α and β phase composition, microhardness 487.3HV0.3.