Theoretical And Experimental Study On Grinding Temperature Distribution In The Cutting Edge Area Of Narrow Deep Groove

Electroplating CBN grinding wheel deep cutting and slow feeding grinding can effectively improve the efficiency of narrow and deep groove processing,but in the grinding process,due to the special structure of large depth and width ratio of narrow depth and deep groove,the traditional grinding fluid cooling lubrication method is difficult to achieve effective Cooling heat transfer,easily lead to excessive temperature in the grinding area,affecting the grinding performance of the grinding wheel,and also cause thermal damage and thermal deformation of the machined surface,which in turn affects the surface quality of the workpiece,and the surface quality of the part directly affects its use.Performance and use.Therefore,under different process parameters,the variation of grinding temperature at different positions of the narrow and deep groove top edge region is studied,which has practical significance for effectively predicting the temperature of the grinding zone and avoiding sudden burns of the workpiece.At the same time,it can be the cooling heat transfer during the grinding process.Theoretical research provides a technical basis.The main research contents and conclusions of this paper are as follows:1.The grinding mechanism of the top and side cutting areas in the narrow and deep groove grinding process is analyzed.The generation and transmission mechanism of the grinding temperature are summarized.Based on the classical heat source model,the grinding process is used in the narrow and deep groove grinding process.The heat flux distribution is discussed.2.Developed a special electroplated CBN grinding wheel for narrow and deep groove forming grinding.According to the grinding wheel base and plating requirements,a reasonable sanding method was designed and special fixtures were manufactured to complete the manufacture of single-layer electroplated CBN grinding wheels.The surface morphology of the grinding wheel before and after grinding was observed and analyzed.The results show that the prepared CBN grinding wheel has good cutting performance and can meet the requirements of narrow deep groove grinding experiment.3.The narrow and deep groove slow-feed grinding test was carried out on 45# steel by CBN grinding wheel,and the grinding force and grinding temperature were analyzed.The results show that the grinding force and the grinding temperature have good consistency.In the initial cutting stage of the grinding wheel,the arc length with the workpiece gradually becomes longer,the metal removal rate increases,and the plastic deformation work of the material increases,which makes the grinding force and grinding.The cutting temperature rises rapidly.When the grinding wheel is cut into the workpiece,the contact arc length tends to be stable and enters the stable grinding stage.At this time,the material of the grinding zone is removed after multiple plastic deformation,which causes the grinding force and the grinding temperature to fluctuate.As the grinding wheel begins to cut out the workpiece,the grinding contact arc length becomes shorter,the number of effective abrasive grains involved in grinding decreases,and the grinding force and grinding temperature decrease rapidly.As the linear speed of the grinding wheel increases,the workpiece feed speed and the grinding depth decrease,the grinding force and the grinding temperature decrease.The workpiece feed speed plays a major role in the grinding temperature during the grinding process.The cutting depth is second,and the impact of the line speed of the grinding wheel is minimal.4.By analyzing the surface morphology of the groove after processing,it is found that the groove marks and ridges are consistently arranged,and as the grinding speed increases,the grinding groove becomes shallower and wider,the surface roughness of the workpiece is reduced,and the surface quality is obtained.Improvement;as the feed rate decreases,the grinding groove becomes shallower,the brittle removal characteristics become less,the surface roughness of the workpiece decreases,and the surface topography becomes better;as the depth of cut decreases,the grinding groove marks become more For uniformity,the groove depth is reduced and the material peeling damage characteristics disappear,the surface roughness of the workpiece is reduced,and the surface morphology is obviously improved.