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如果使用激光金属直接成形方法制备金属零件时,能够通过最优的工艺参数来有效地控制金属成形件内部的不同区域及成形件与基板间的温度梯度和能量分布,使成形件内部产生缺陷的几率减小,会极大地提升成形件的力学性能。针对激光金属直接成形方法制备金属零件内部是否存在缺陷的二分类问题,通过使用正交旋转实验设计的方法进行工艺实验,得到不同参数下的钛合金激光金属直接成形试样是否存在内部缺陷情况。对实验结果进行Logistic回归建模,使用Logistic回归模型计算的工艺参数进行验证实验,样件内部未发现内部缺陷,说明Logistic回归模型结果与实际结果有较高的一致性。Logistic回归模型对激光金属直接成形工艺参数的选择具有积极的指导意义。
If the laser metal direct forming method is used to prepare the metal part, the temperature gradient and the energy distribution between the different parts of the metal forming part and the forming part and the substrate can be effectively controlled through the optimal process parameters to make the interior of the forming part have defects With less chance, the mechanical properties of the formed part will be greatly improved. Aiming at the dichotomy problem of the existence of defects in metal parts by direct laser metal forming method, the process experiment was carried out by the method of orthogonal rotation experiment to get the internal defects of titanium alloy laser metal direct forming samples under different parameters. Logistic regression model was used to test the experimental results. The process parameters calculated by Logistic regression model were used to validate the experiment. No internal defects were found in the samples, indicating that the Logistic regression model has a high consistency with the actual results. Logistic regression model has a positive guiding significance for the choice of laser metal direct forming process parameters.