Design And Performance Analysisofthe High Speed Spindle-toolholder Interface With Dynamiccompensation For Its Expansion Caused By Centrifugal Force

Tooling system for high speed machining refers to the connection system between themachine tool spindle and cutting tool,its performance directly determines the quality ofmachining,tool’s life and so on.Traditional high speed system gives no consideration to theinfluence of centrifugal force,and then results in a series of problems,such as machiningprecision,stiffness,security and reliable.In this condition,thenewsystem represented by theHSKwhich has hollow and short cone body,double sides positioning and some othercharacteristics emerged.But because the demand of people for the system’s performance isincreasing continually,HSK tool system also exposed some shortcomings,such as low limitvelocity of spindle-toolholder interface,decreasing of positioning accuracy and connectionstiffness significantly.One important reason is that the amount of expansion of the spindlecaused by centrifugal isn’t consistent withthe toolholders’.Solving this problem effectivelybecomes the key to improve the system’s performance.For these problems above,designed an compensation system to compensate theexpansion of the spindle-toolholder interface on the spindle.Taking the interface as theresearch object,studyed the interface deformation in theoretical way,and made numericalsimulation for the stress distribution and interface characteristics using the FEA.The mainresearch work is as follows:(1) Structural design of automatic compensation system for the expansion ofspindle-toolholder interfaceAccording to thesize of the spindle,related design requirements and relevanttheoretical calculation,confirmed the basic structure and size of each part, carried out somecorresponding structural optimization.(2) Establishing the mechanical model of the dynamic compensation systemRelying on elastic mechanical theory,we established the mechanical model of theinterface deformation,analyzed the deformation rule of the interface,obtained thefunctional relationship between the interface’s contact stress,strain and the spindle’svelocity,provided a theoretical basis for the numerical simulation of the interfacedeformation. (3) The numerical simulation with FEA of the spindle-toolholder interfacedeformationUsing the finite element method,researched on the deformation,stressdistribution,connection stiffness,limit velocity of the interface,discusses and analyzed theinfluence laws of the spindle velocity,clamping force,the value of interference on thecontact stress and the connection stiffness. madea comparative analysis with the HSKstandard interface.