Establishment and verification of compound drilling tool load model

LI Jianglian1, HU Chunmei2, NI Jing1, ZHANG Zhixiao1

(Mechanical Engineering School, Hangzhou Dianzi University, Hangzhou 310018, China;
2.CHR Intelligent Equipment Co., LTD., Lishui 321404, China)

Abstract: 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.

Key words: compound drilling; equivalent model; spindle radial runout; oblique cutting