Design Of Mould And Device Of Ultra-thin Cutting Grinding Was Prepared By Torque-compression

The purpose of this project is to study the new process of torque-compression for the preparation of ultra-thin cutting pieces proposed by our research group.Firstly,the plastic forming process of billet was simulated,and the optimal applying mode of force and constraint was obtained.According to the results of plastic forming analysis,the mold structure was designed.The three dimensional modeling design of the rotary mill was carried out,and the finite element simulation was carried out.According to the simulation results,the structure of the rotary mill was optimized.The plastic forming process of the billet was simulated and the motion of copper powder particles was simulated.It was found that applying radial deformation constraint to the billet could not only ensure the accurate radius of the forming cut piece,but also increase the thickness compression of the billet.The influence of torsional stress on billet forming effect is studied.It was found that when the torsional stress is greater than 40 MPa,the density of billet will be reduced.When the torsional stress was applied with a downward Angle,the thickness compression of billet can be increased by 24.28%,and the billet thickness will not decrease with the increase of torsional stress.The influence of torquecompression parameters on torque-compression forming effect was studied.It was found that better compression effect of billet thickness could be obtained when the upper die speed was 0.314rad/s.When the die speed was 0.314rad/s and the load holding time was 10 s,the billet thickness can reach 0.6044 mm,and the torque-compression effect was good.The structure of the die was designed,and it was found that the compression effect of the thickness of the convex die was better than that of the groove die.The shape uniformity of the cutting pieces of the cylindrical convex die was similar to that of the straight convex die.The compression effect of the thickness of the circular convex die was better than that of the straight convex die.The main dimension parameters of cylindrical convex die are determined as e=0.1mm,δ=0,β=90°.It was found that the mold with V-shaped convex edge could improve the edge forming effect of the formed cutting pieces,and the dimension parameter of V-shaped convex was determined to be θ=45°,g=0.24 mm.The designed mold can make the density of the billet forming cutting pieces with the radius range of 15-80 mm reach more than 0.9.The structure of the device of torque-compression was designed,and the connection mode of the upper and lower molds was designed.The connection structure of the shaft and the upper molds can realize no relative movement and accurate positioning between them,and can realize the connection with the mold with the radius range of 8-100 mm.The three dimensional modeling design of the rotary mill was carried out.The designed the device of torque-compression can realize the electric loading of the load,the maximum compressive stress loading is 100 MPa,the maximum torsional stress loading is 250 MPa,and the maximum deformation of the rotary mill was 0.07 mm under the ultimate load condition,which meets the design requirements.The modal analysis of the rotary mill is carried out,and the vibration performance of the rotary mill is improved according to the modal analysis results.