| AISI 1045 steel is improved carbon structural steel.It has excellent cold and hot processing performance and mechanical properties.AISI 1045 steel commonly used to make compressors and movement parts of pump.It can also replace carburized steel to make gear,shaft,piston pin and other parts or casting.Therefore,the research on the processing property of AISI 1045 steel has been widely concerned by scholars both at here and abroad.The surface quality of the machined in a large part surface affects the quality of the parts and the performance of the components to a great extent.The processing method of obtaining high precision and high surface quality is the hot spot of research.At present,the maximum roughness of ordinary turning and milling is Ra 0.4,while the maximum roughness of precision grinding is Ra 0.05,which can meet the requirements of most precision instruments.Therefore,it is of great significance to study the grinding mechanism of AISI 1045 steel.In this paper,the grinding mechanism of AISI 1045 steel is explored by using the finite element simulation technique and the experimental method.The influence of different grinding parameters(feed rate,grinding speed and abrasive front angle)on the grinding heat and grinding temperature in the grinding process is studied.It provides a theoretical basis for the deep research of grinding theory.The main achievements and the innovation ideas in the paper are as following:(1)A single CBN abrasive type was established,and the single CBN abrasive particles were simplified according to the current experimental conditions,and a simplified model was established.The relevant parameters model in the grinding process is established,and the basic theory of the geometry and motion contact arc length of the grinding zone and the thickness of the wear debris are summarized.The theory of grinding force is analyzed and calculated,and the ratio of specific grinding energy to grinding heat is studied,and a heat source model suitable for experiment and simulation is established.(2)The parameters of AISI 1045 steel Johnson-Cook constitutive model are determined.The process of single CBN abrasive grinding AISI 1045 steel is simulated by DEFORM-3D finite element simulation software.And the influence of feed rate,grinding speed and abrasive front angle on grinding force and grinding temperature is analyzed and summarized.The results show that the grinding force and grinding temperature are increasing with the increase of feed speed.With the increase of grinding speed,the highest temperature of the grinding zone was significantly increased,but the grinding force in grinding process with the grinding speed increases;when the feed speed and grinding speed,the grinding temperature and the grinding force are the highest region decreases with the increase of abrasive and rake angle.(3)The experiment of grinding AISI 1045 steel with single CBN abrasive grinding under different grinding parameters has been completed,and the surface morphology of the grinding surface is observed.The influence of different grinding parameters on the grinding force and the grinding temperature during the grinding process is summarized and analyzed.The results show that the grinding process has experienced the process of sliding,plowing,and cutting at the cutting end.The grinding mark on the surface of the grinding groove is a cutting trace formed during the cutting process of the abrasive micro cutting edge.With the increase of feed speed,the highest temperature of the grinding zone and grinding force were increased;with increasing grinding speed,the highest temperature of the grinding zone was significantly increased,but the grinding force in grinding process with the grinding speed increases;grinding area and maximum temperature of grinding force decrease with the increase of grit and rake angle.The results of the finite element simulation are in good consistency with the experimental results. |
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