Design Of High Speed Tool Holder Of The Composite Structure With High Elastic Taper

The core of the high-speed machining tool system is the tool holder,which plays a vital role in ensuring the precise positioning of the tool and transfer the movement and power required for processing.With the high speed machine spindle speed is getting higher and higher,the traditional BT handle of long cone solid structure,with the 7:24taper and the single-sided positioning,can not meet requirement of the high-speed processing.The HSK handle of the short cone hollow structure,with the 1:10 taper and the double-sided positioning,the limit speed of which has been significantly improved.However,to meet the higher speed of the processing requirements,the limit speed of the high-speed tool holder still need to be improved.In order to improve the limit speed of existing tool holder,a new type of high-speed tool holder with high elastic cone is designed.The theoretical and finite element method is used to study the toolholder/spindle coupling performance and the rotational speed of the shank.The specific research contents are as follows:First,the structure of the new tool holder was designed.This paper analyzes the factors that can limit the rotational speed of the shank,and designs a new type of highspeed compound handle.With the aid of ANSYS Workbench nonlinear finite element software,the structure of the shank is determined that the composite structure of the shank body and the taper sleeve is used to determine the interference amount of 12?m;the shank and spindle taper surface interference for the big end 32?m,small end 30?m;the thickness of the taper sleeve is 3mm,the material is MB7 magnesium alloy.Secondly,the performance of the tool holder is calculated and analyzed.The stiffness of the shank is analyzed by the theoretical calculation.The stiffness of the shank/spindle is analyzed,including axial stiffness,radial stiffness and torsional stiffness.The limit speed of the shank is analyzed,Material strength and shank limit speed based on preload.Finally,the performance of the tool holder is analyzed by finite element method.Through the finite element software,the contact stress and the contact area size and distribution of the tooling/spindle mating surface are analyzed.The limit speed of the shank and the connection stiffness of the shank/spindle are analyzed.