复合钻削刀具负载的建模与验证研究

针对复合钻削刀具钻孔过程负载计算误差较大,负载动特性预测精度较低的问题,对复合钻削的切削负载动态过程进行了研究。基于斜角切削理论,针对主切削刃负载和倒角刃单元负载受力分析,分别建立了主切削刃和倒角刃的等效切削模型。由于复合钻削过程的复杂性,采用数学分析和经验值相结合的方法,提出了钻削过程动态负载模型。同时考虑钻削过程中主轴径向跳动对切削性能的影响,进一步优化了复合钻削负载模型。通过对复合刀具不同刃不同切削工况的负载叠加融合,提出了复合钻削动态负载模型,并进行了仿真和实验。结果表明,考虑主轴径向跳动所建立模型相较于未考虑主轴径向跳动模型更能够准确地描述复合钻削刀具的动态负载特性,其负载误差比未考虑主轴跳动的情况减小了10%。

Establishment and verification of compound drilling tool load model

Aiming at the problem that the models of drilling force have big errors and could not accurately predict the dynamic load,the dynamic load of compound drilling was investigated.Based on the oblique cutting theory,the force of drilling was analyzed.The equivalent model of drilling force was established by analyzing the load of unit main cutting edge and chamfer edge.Because of the complexity of drilling process,the models of dynamics drilling torque were established by combination of math analysis and empirical data.Considering the effects of the spindle radial runout during the drilling,the model of drilling force was further optimized.By means of figuring up the load of the different cutting edge about compound cutting tool in the different operating condition,the dynamic load model of compound drilling can be established.Through the experiment and simulation,the results indicate that the model which was considered the spindle radial runout is more accurate than the model which was not considered the spindle radial runout to predict the the characteristic of dynamic compound drilling load.The error of the cutting load is less 10％ than the result which was not considered the spindle runout.