锥面分段开孔高速刀柄的设计方法

Design method of high speed toolholder with positioning cone surface containing sectionally drilled holes

根据高速刀柄在不同过盈量下的联接性能分析结果与不同转速下的锥面接触应力分布规律,提出了一种锥面分段开孔高速刀柄的设计方法,即对刀柄定位锥面按照锥体素线长度均等分成前、中、后三段,并在各段的中等分处周向均布一组盲孔,通过调控盲孔的数量与尺寸使刀柄锥面达到一定的柔度。文章阐述了盲孔开设参数对锥面接触应力、柔度的影响规律和参数确定原则,给出了以HSK-E50为原型的锥面分段开孔设计案例,采用有限元分析其极限转速和锥面接触应力分布情况。结果表明,锥面分段开孔刀柄与原型刀柄相比,极限转速提高了约10.79%,锥面接触应力分布显著均匀。

According to the analysis results of the connection performance of the high-speed toolholder under different interference amounts and the distribution law of the cone surface contact stress at different speeds,a design method of the high-speed toolholder with cone surface containing sectionally drilled holes is proposed.The cone surface is divided into three equal sections according to the length of the generatrix on the cone,and a set of blind holes are evenly distributed circumferentially at each section.By adjusting the number and size of the blind holes,the cone surface of the toolholder reaches a certain flexibility.The influence of blind hole opening parameters on the contact stress and flexibility of the toolholder cone surface is elucidated,and the parameter optimization range is proposed.The design case of cone segmented opening based on HSK-E50 is given,and the limit speed and contact stress distribution are analyzed by FEM.The results show that compared with the prototype toolholder,the limit speed of the new toolholder is increased by about 10.79%,and the contact stress distribution of the cone surface is significantly uniform.