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针对弱刚性钛合金薄板钻削过程,从理论和实验两方面研究工件刚度对轴向力和出口毛刺的影响规律。考虑工件变形与轴向力的相互影响,建立弱刚性钛板钻削轴向力预测模型,求解工件变形带来的附加进给率,结合提出的毛刺厚度预测方法和高度累积判定式,实现工件刚度的影响规律分析,并设计以刚度和进给率为变量的钻削实验。实验结果表明,随着工件刚度的减小,轴向力曲线上升段延长、下降段缩短,最大值略微减小;而毛刺高度减小、厚度增加,类型从冠状变为均匀状。轴向力预测曲线与实验曲线趋势相符,峰值预测误差在8%以内;毛刺尺寸和类型的理论分析结果与实验结果具有一致性。工件刚度以改变实际进给率的方式影响钻削过程,因此弱刚性钛板钻削出口毛刺的抑制要综合考虑工件刚度的影响。
Aiming at the drilling process of weakly rigid titanium alloy sheet, the influence of workpiece rigidity on axial force and exit burr is studied theoretically and experimentally. Considering the mutual influence between workpiece deformation and axial force, the prediction model of axial drilling force of weak rigid titanium plate is set up, and the additional feed rate of workpiece deformation is solved. Combined with the proposed burr thickness prediction method and height cumulative determination formula, Stiffness of the impact of law analysis and design of the stiffness and feed rate as a variable drilling experiment. The experimental results show that as the rigidity of the workpiece decreases, the ascending section of the axial force curve extends, the descending section shortens, and the maximum decreases slightly; while the burr height decreases and the thickness increases, the type changes from the crown to the uniform shape. The axial force prediction curve is consistent with the trend of the experimental curve, and the peak prediction error is within 8%. The theoretical analysis results of the burr size and type are consistent with the experimental results. The rigidity of the workpiece changes the actual feed rate and affects the drilling process. Therefore, the suppression of the burr at the exit of the weak rigid titanium plate should consider the effect of the rigidity of the workpiece.