数控加工刀具变形误差补偿技术研究

Study on Error Compensation of Tool Deflection Based on Cutting Force in NC Machining

在数控铣削加工的研究中,刀具变形引起的加工误差对工件的加工精度影响较大。研究了一种考虑切屑厚度影响的切削力模型,建立了由切削力引起的刀具变形加工误差的分析模型。为了提高加工精度,提出了一种线性迭代误差补偿算法,方法主要对由切削力引起的刀具变形产生的切削误差进行循环迭代补偿。通过应用数控加工中心,方案进行了验证,对补偿后的加工误差测量值和补偿后的误差预测值进行比较,结果表明,采用的方法对刀具变形引起的误差能进行有效的补偿。

Force-induced error is one of the key elements in achieving overall product quality in NC machining. The study introduces a model of cutting force, takes into account the affect of thickness of chip and establishs an error model caused by the deflection of the cutting tool. The study introduces a linear iterative machining error compensation approach. The algorithm is focused on the errors of deflection of the tool caused by the cutting force. The error compensation scheme is simulated using NC machining center and the results show that the algorithm is correct.