The Thermal-Force Distribution Analysis On The Formation Of Machined Surface In High Speed Milling Hardened Steel

The overall level of the life of the car cover mold home is lower than the international advanced level.The precision and good quality automobile cover hardened steel molds still mainly rely on imports.The fundamental reason for this phenomenon is that our auto cover hardened steel molds attach great importance to the structural integrity and pay little attention to the integrity of the surface.Based on the complex contact relationship of tool-workpiece,this paper establishes the tool and workpiece contact relationship with varying cutting thick orthogonal cutting model to simulation the transient climb milling process,and the corresponding simulation based on the high speed milling process is conducted too.The heat production model in high speed cutting is established.Based on determination of key technology in finite element simulation including constitutive relation model,friction model and the chip separation criteria,finite element simulation grid technology reasonablely,the high speed milling of hardened steel 3 d finite element model is established.Based on orthogonal cutting models,the analytical model is established to compute the stress and temperature field of the first deformation zone;Based on the established 3D finite element milling model,the stress and temperature field distribution characteristic are analysised;The distribution characteristic parameters of stress field and temperature field is put forward,and in this way,the stress field and temperature field in the process of cutting is given a specific expression using the methods of combination qualitative with quantitative.The influence of cutting parameters on these characteristic parameters is analyzed.The high-speed milling of hardened steel molds univariate tests is carried out,based on this,the impact of cutting parameters on thermodynamic propertie in the high speed milling process are represented;Comparison analysis of the result of the experiment and finite element is conducted to verify the correctness of the finiteelement simulation resultsThe impact of cutting parameters on residual stress and work hardening is studied.The residual stress and the hardness changing along the depth direction of surface layer of the machined surface of workpiece is explained based on thermodynamic distribution properties.The above content makes a basic research to reveal thermodynamic distribution law of the surface forming in the high speed milling hardened steel,as well as,the prediction and control of high speed milling surface quality;It can also be used as the initial conditions in study the fatigue performance and life of the hardened steel mould producted by high speed milling.