磁场辅助连续梯度功能复合结构研抛工具研制OA北大核心CSTPCD

Aiming at the problem of non-uniform material removal of hard and brittle materials such as optical glass,a continuous functionally graded and composite structured lapping and polishing tool based on magnetic field is pro-posed.Based on the Preston removal model,a double-layer elastomer structure is designed and established.In or-der to ensure the continuous change of Young's modulus of the lapping and polishing tool in the radial direction,different volume ratios of carbonyl iron powder,silicon carbide and silicon rubber are mixed,then the magnetic field with a radially radial flux acting on the magnetic particles is used to get the continuous gradient layer.Moreo-ver,by optical microscope and tensile testing machine,the internal microstructure and characteristics of the com-posites under different volume ratios are obtained.The contact stress between the tool and the workpiece is studied by simulation analysis,and then is tested and verified by a force sensor tester.The results show that through opti-mization of volume ratios and adjustment of magnetic field,the continuous functionally graded and composite struc-tured lapping and polishing tool can form a continuous elastic modulus distribution from the inner ring to the outer ring.Also,the contact stress is closer to the theoretical curve,and the standard deviation of PR is less than 0.23.