Application Of Cutting Numerical Simulation In Design Of Heat Resistant Steel Finishing Insert

In recent years,the development of China cutting tools is in full swing,and China has the ability to design and produce the solid carbide drill bit,milling cutter and other standard tools and some non-standard solid carbide tool independently.At present,the solid carbide tools used for precision machining have been made domestically.However,the localization rate of computer numerical control(CNC)blade is hard to be improved.Therefore,it is of great theoretical and practical value to study the design method of CNC blade to improve the development of CNC blade and the protection of independent intellectual property.In this paper,aiming at the problems in CNC blade design and manufacturing,the numerical simulation technology is used to study the design and optimization methods of CNC blade based on the finishing process of martensitic stainless steel 2Cr12Ni4Mo3VNbN(Fe-Cr-Ni stainless steel).First of all,the simulation models of turning are built,and the function mechanism of each model in the process of numerical simulation is analyzed.The whole three dimensional metal cutting process is simplified as a two dimensional plane strain problem for the sake of a more efficient and concise design of CNC blade.The solution to retain the consistency of meshing is proposed.The evaluation index and criterion of optimizing the process of cutting simulation are put forward,which lays a theoretical foundation for the further research.Secondly,the optimization process of the geometric parameters of CNC blade is put forward,and the influence of the geometric parameters of blade edge on the cutting process is analyzed.The blade stress and the chip deformation coefficient are selected as the evaluation indexes to optimize the rake angle and cutting edge radius of the blade.The influences of blade rake angle and cutting edge radius on blade stress or chip deformation coefficient are analyzed.The optimum blade rake angle and blade edge radius based on this method are obtained.Then,the optimization process of the two dimensional groove geometric parameters of CNC blade is proposed.Based on the optimal cutting edge geometry parameters,a two dimensional groove simulation model is established.Through single factor experiment,the groove geometry parameters are optimized,and the chip morphology is predicted by the empirical formula.By observing the chip breaking effect,the influence rule of each groove parameter on cutting physical quantities is analyzed,and the optimal groove parameters are obtained finally.Three dimensional design software is used to establish the three dimensional model of the groove blade,which is ready for the establishment of the three dimensional simulation models.Finally,the influence of the main declination and the incline angle on the cutting physical quantities is studied.The influence of the main declination and the incline angle on the chip flow and the chip shaving is analyzed,and the cutting simulation result is predicted.At the same time,the cutting experiment on the angles of the cutter is designed.In the cutting process experiment,the chip flow,chip scrap,cutting force and cutting temperature are compared with these in the simulation,the error is within the allowable range and the results are in good agreement.