Research Of High-speed Tool Holder On The Centrifugal Expansion Dynamicly Compensating By Mesh Cone

In the modern machine tool manufacturing,the high-speed of the machine is an inevitable trend.With the continuous improvement of the spindle speed of the machine tool,the problem of the gap between the tool holder and the spindle taper hole because of centrifugal inflation is more and more serious.So that the traditional BT tool holder is not suitable for high-speed machining,and it is urgent to develop a new type of high-speed tool holder.The Showa D-F-C and 3LOCK tool holder developed from Japan have a combination of cone sets and disc spring in the shank.The cone sets can be used to compensate the gap by the axial movement under the impetus of the disc spring,which improve the machine tool spindle limit speed.However,due to the gap between Showa D-F-C tool holder’s cone sets and tool holder body contact cylindrical surface because of centrifugal expansion can’t be compensated and the problem of 3LOCK tool holder dynamic balance itself,their limit speed can’t be further improved.Aiming at the problem that the gap between the tool holder and the spindle taper hole is caused by the centrifugal expansion and combined with the above two kinds of tool holder compensation principle,the paper designed a new high-speed tool holder which use a mesh cone dynamically to compensate centrifugal expansion,and referred to as the new high-speed tool holder.The structure of the new high-speed tool holder was designed by the relevant theory and finite element simulation.The performance of the tool holder/spindle connection was studied.The concrete contents are as follows:First of all,the new high-speed tool holder for the structural design.Determined its basic dimensions and design requirements.The structure of the locking nut was determined and the standard pull nail was selected as the clamping mechanism,and the new high-speed tool holder performance guarantee measure was given.The shape of the non-standard disc spring was designed,and the deformation-load characteristic curve was calculated theoretically.The initial preload was determined by finite element simulation.Secondly,the mesh cone was designed.Determined its basic dimensions.Two kinds of slitting methods were designed and compared.The structural parameters were determined by the combination of finite element simulation and orthogonal test.By analyzing the influence of the speed on the contact stress,the range of the tapered interference was determined.Finally,the structural dimension of the mesh cone and the tool holder body was given.Finally,combined with the HSK tool holder,the new high-speed tool holder/spindle coupling performance was analyzed.The positioning accuracy was analyzed.The radial stiffness and torsional stiffness were calculated by finite element simulation and compared with the HSK tool holder,and determined its clamping force.The influence of the speed on the axis movement of the mesh cone,and the average contact stress of the cone and the end face was analyzed,the its limit speed was determined.