Study On The Uniformity Of The Hardened Layer And The Deformation Of The Workpiece In The Preheating Plane Grinding

Grinding surface hardening technology is a composite machining technology of integrated grinding and heat treatment,which uses the heat generated during grinding to strengthen the surface of the workpiece.The preheating grinding hardening is mainly to increase the workpiece temperature by conducting heat generation,so as to improve the depth of grinding hardening layer.Based on experiment of plane grinding intensifying with conductive preheating,the 304 stainless steel gasket was added to the entry end of the workpiece,so that it can achieve the purpose of temperature compensation for the entry end of the workpiece with the characteristics of large resistivity and small thermal conductivity,thus,the uniformity of the depth distribution in the grinding direction of the workpiece and the deformation of the workpiece are improved after grinding,it is of great significance to improve the surface precision of the workpiece.The main contents of this thesis are as follows:On the basis of conductive preheating grinding,using joule law and 304 stainless steel material properties,the influence of the thickness of 304 stainless steel at the entry end of the workpiece on the depth distribution unifo rmity of the hardened layer along the workpiece grinding direction after grinding was studied.The experimental results show that: the 304 stainless steel was added at the entry end of the workpiece can achieve the purpose of temperature compensation for t he cutting end of the workpiece,and then the uniformity of depth distribution is enhanced along the workpiece grinding direction after grinding.Moreover,different thickness of stainless steel have different effects on the hardened layer depth of the workpiece after grinding and the proper increase of the thickness of stainless steel can improve the uniformity of hardened layer after grinding.On the basis of conductive preheating grinding,the effect of different preheating temperature and thickness of 304 stainless steel on the deformation of the workpiece after grinding was studied.The experimental results show that: preheating grinding can reduce the deformation of the workpiece after grinding at normal temperature,the grinding on the basis of preheating by adding 304 stainless steel gasket at the entry end of the workpiece can further reduce the workpiece deformation after grinding.The different thickness of stainless steel has different influence on the deformation of the workpiece after grinding,and the proper increase of the thickness of stainless steel can reduce the deformation of the workpiece after the grinding.The ANSYS finite element software is used to simulate the temperature field of the workpiece through the APDL command stream,so as to get the depth distribution along the workpiece grinding direction,meanwhile,based on the simulation analysis of the temperature field,the thermal-force coupling finite element analysis method is used to analyze the deformation of the workpiece aft er grinding,and the results are compared with the experimental results.The results show that: preheating grinding can improve the depth of hardened layer in grinding direction after grinding,and the thickness of stainless steel can be increased properly on the basis of preheating grinding,which can improve the uniformity of the hardened layer after grinding and reduce the deformation of the workpiece.