新型大柔度锥面高速刀柄的设计

Design of a new type of high speed tool holder with a flexible conical surface

设计了一种新型结构高速刀柄,刀柄的结构特征为实心短锥双面定位,并在锥面上开环形沟槽形成分锥体。由分锥体组合而成的大柔度锥面允许刀柄与主轴锥孔以较大过盈量配合联接,同时刀柄分锥体高速旋转时能够产生较大的离心膨胀与主轴锥孔膨胀相匹配,提高了刀柄与主轴接口的极限转速和联接刚度。对刀柄结构进行了设计,利用有限元分析对刀柄的主要几何参数、过盈量以及极限转速进行了确定。研究结果证明,与常用的HSK刀柄相比,所设计的新型高速刀柄能够显著提高刀柄的极限转速。

A new type of tool holder was designed. It has the characteristic features of solid core, short cone, posi- tioned by two surfaces. Several independent cones are produced by cutting circular grooves on the coni- cal surface. The high flexible conical surface consists of independent cones allows a larger interference between tool holder and taper hole of spindle, in addition the larger centrifugal expansion of independent cones in high speed matches with the spindle expansion better. This increases limit rotate speed and stiffness of the tool holder/spindle interface. In this paper, the structure of the tool holder is designed, and the main geometric parameters, interference and limit rotate speed are determined. The research re- sults proved that the new tape of tool holder has higher limit rotate speed than HSK used commonly at present.