Study On Grinding Process And Grinding Wheel Compensation Of Solid Carbide End Milling Cutter

With the continuous improvement of the performance of the engineering materials,carbide cutting tools are gradually replacing the traditional high-speed tool.However,some problems are existed in the production of carbide cutting tools,such as low processing efficiency,improper grinding process parameters,the fluctuating size of the tools,chipping and other problems.Therefore,it has great theoretical and practical significance to have systematical study on the grinding process of the cemented carbide tool.In this thesis,it focus on the grinding process of solid carbide end mill,which is one kind of carbide cutting tools.To optimize its grinding process parameters,so some quality problems caused by improper grinding parameters can be avoided.To improve the consistency of the key dimensions of the grinded tool,some standard suggestion are made to the relevant steps of the grinding process.In the process of this study,it is mainly worked on the following research content:(1)The grinding process of the solid carbide end mill includes seven steps.The seven steps are as following:rough grinding groove,shoveling grinding of the blade,the grinding of chip pocket,the grinding of the end teeth angle 1,the grinding of the end teeth angle 2,chamfer and fine grinding groove.To get the optimized grinding process parameters for each step,some research is taken on them.During the grinding process,the grinding power and the processing time are collected.After the grinding,the surface quality and the sub-surface quality of the relevant parts are analyzed.Based on the comprehensive analysis,the initial preferred grinding process parameters is got.Under this grinding process parameters,the maximum depth of the crack is less than 35?m,the surface roughness value of the end tooth angle 1 and the end tooth angle 2 is less than 0.2?m,and the surface roughness of the finish groove is less than 0.6?m.(2)To ensure the stability of the grinding process parameters we get,we do the repeated grinding experiment.The grinding power and processing time are gathered.After the grinding experiment,we analysis the size,the surface and sub-surface quality of the relevant parts.Based on these analyses,it can show that if the grinding process is steady or not when the grinding parameters we get is used into production.Then the best grinding process parameters can be got.During this experiment,the grinding cracks are appeared in very few work pieces.But the maximum depth of the crack does not exceed 15?m,the surface roughness value of the end tooth angle 1 and the end tooth angle 2 is less than 0.3?,and the surface roughness value of the refining groove is less than 0.7?m.(3)The changes of the cutter diameter is studied during the whole dressing cycle of the grinding wheel.The gray prediction method is used to establish the prediction model of grinded cutter diameter.The maximum absolute error of the prediction model does not exceed 0.014mm.And the maximum relative error is not more than 0.12%.According to this model,the threshold model of the predicting cutter diameter is established for the process of the grinding wheel compensation.Then we study the step of chamfer which has big influence on the change of the cutter diameter.The wearing situation of the grinding wheel which is used in this step is analyzed.Based on the analysis,the grinding rule of its grinding wheel is founded.Last taking the threshold model of the predicting cutter diameter into consideration,the compensation model of grinding wheel is established for this step.