The Research On Cutting Characteristics Of Hardened Steel In High Speed Cutting

Hardened steel is widely used in the manufacture of wear-resistant dies,bearings and key parts in automobile because of its good mechanical and physical properties.However,it is difficult to process because of its high hardness,high strength,poor plastic deformation and large unit cutting resistance,which is a serious problem in the application and popularization of this material.In the process of machining,it often occurs that the tool wear is fast and the blade collapses,which causes damage to the workpiece,or the efficiency is low and can not achieve the desired effect.In order to improve machining efficiency and workpiece quality,it is necessary to correctly select machining methods,tool materials,tool geometric parameters and cutting parameters,so it is particularly important to study the cutting characteristics of hardened steel materials.The data of cutting force and cutting temperature are obtained by finite element simulation,and the range analysis is carried out to obtain the primary and secondary order of the influence of cutting parameters on cutting force and cutting temperature and the optimal parameter combination.The milling experiment of hardened steel is designed,and the test data and simulation values are compared and analyzed to verify the correctness of the simulation model.The single factor test was carried out,and the results were analyzed.With the increase of cutting speed,the milling force increased,but the cutting temperature decreased,and the milling force and milling temperature increased with the increase of feed per tooth.Compared with the cutting speed and the feed per tooth,the back feed has a greater influence on the milling force.the milling force increases rapidly with the increase of the back feed,and the milling temperature increases with the increase of the back feed.The surface roughness of the workpiece is measured and the results are analyzed.It is found that the greatest influence on the surface roughness is the amount of feed per tooth and the cutting speed.The influence of various factors on the roughness is as follows: the surface roughness increases with the increase of feed per tooth and decreases with the increase of cutting speed.The milling process of hardened steel is simulated by Deform-3D simulation software,and the tool wear under different cutting parameters is obtained.The tool surface morphology after milling is observed by using digital microscope system,the surface morphology is simply analyzed,and the causes of different types of tool wear are explained.The influence of cutting parameters on tool wear is analyzed by single factor test.Through the MATLAB software,taking the minimum cutting force,the minimum surface roughness and the maximum material removal rate as the goal,the genetic algorithm is used to optimize the multi-objective parameters to provide reference for hardened steel milling cutting parameters.