基于复合材料钻削缺陷容差值的工艺参数优化

为实现复合材料层合板在一定钻削缺陷容差值内的工艺参数优化，首先利用SEM对复合材料的组织结构进行测试分析，获得了复合材料层合板的截面形貌和特征尺寸。然后进行钻削加工正交实验，测试了不同加工参数下的钻削轴向力和扭矩，对钻孔过程中产生的分层、撕裂和孔壁圆度误差等缺陷进行测量，分析了缺陷产生的机制，并对测量结果进行非线性拟合得到缺陷的变化规律。通过建立钻削缺陷与轴向力及扭矩偏差的关系，获得了轴向力和扭矩偏差的临界范围。最后以钻头的主轴转速、每转进给量及钻头结构参数中的横刃偏心系数为决策变量，以获得最大材料去除率为优化目标，以钻削缺陷容差值为约束条件，建立了复合材料钻削加工的参数优化模型。 使用MATLAB软件进行工艺参数优化，在保证复合材料钻削质量的前提下，得到了能够实现最大生产效率的钻削参数。

Process parameter optimization based on the defects tolerance of drilling composites

In order to realize the optimization of process parameters within a certain tolerance of drilling defects, the organization structure of the composites was tested to obtain the sectional morphologies and feature size of composite laminates by SEM. Then the orthogonal experiment was designed to test the thrust and torque, and the delamination, tearing and roundness error arising from drilling process were measured. The mechanism of defects was analyzed. The relevant variation was studied from the measured value by non-linear fitting. The relationships between the drilling defects and the thrust force, torque deviation were established to obtain the critical range respectively. At last, the spindle speed, feed rate and chisel edge eccentricity coefficient were selected as decision variables, and reaching the maximum material removal rate was chosen as the optimization goal, and the defects tolerance of drilling were selected as the constraint condition. And the parameter optimization model of drilling was established. The optimization of process parameters was realized with the MATLAB software to obtain the process parameters that ensure the maximum productivity and the suitable quality of composite drilling.