Analysis Of Energy Partition In Narrow Deep Groove Grinding Zone Of 40Cr Steel

The narrow-deep-groove structure with a groove width of less than 2mm and a groove depth of more than 5mm is widely used in actual production,but achieving its high-precision processing is always a problem of mechanical processing.Grinding temperature usually affects the surface quality of the workpiece.When the grinding temperature is high,it will cause various forms of thermal damage on the surface of the workpiece.Electroplating CBN grinding wheel creep feed deep grinding can effectively reduce the grinding process temperature and improve the processing efficiency and accuracy of narrow-deep-groove.In this paper,through theoretical derivation,experimental analysis and finite element simulation,the energy partition of the 40 Cr steel workpiece in the narrow-deep-groove grinding area is studied.The main research contents are as follows:(1)The grinding contact length of the top edge section and the side blade section during the narrow-deep-groove grinding process are theoretically analyzed,and the physical model of grinding force during the grinding process is studied.Aiming at the distribution of temperature field in the grinding process,this paper first discuss various grinding heat source models,and establish a quadratic curve heat source model suitable for narrow-deep-groove grinding.On this basis,a theory of heat source coupling is proposed.This article focus on the analysis of the heat distribution and transfer in the grinding zone,discusses different energy partition models,and studies the model of the energy partition in the narrow-deep-groove grinding.(2)A single-layer electroplated CBN grinding wheel is used to perform a creep-feed deep narrow-deep-groove dry grinding experiment on the workpiece made of 40 Cr steel.The grinding temperature of the narrow deep groove is systematically studied,and the experiment results are compared with the theoretical temperature calculations.The results show that the highest temperature of the workpiece during the entire grinding process occur at the position where the upper surface of the cut end of the workpiece is farthest from the starting point of grinding.The bottom and sides of the narrow-deep-groove is coupled by multiple grinding heat sources.The grinding heat source directly acting on the machining surface has the most significant effect on thetemperature of the machining surface,and the heat source with a longer distance has less influence on its temperature.The experimental measures temperature of the narrow-deep-groove shows good consistency with the theoretically calculated results.The grinding temperature increases with the increase of the wheel speed,the workpiece feed speed and the grinding depth.In the grinding process.The grinding depth has the greatest influence on the grinding temperature,the workpiece feed speed is second,and the grinding wheel speed has the smallest influence on the grinding temperature.(3)The transient temperature field of narrow-deep-groove grinding is analyzed by finite element simulation.By establishing geometric models,meshing,defining boundary conditions and applying heat flux loads,using ANSYS software's live-and-death element technology,and using parametric design language to achieve material removal and heat source movement.Through simulation analysis,it can be concluded that the quadratic curve heat source distribution model can effectively reflect the actual grinding temperature distribution.The modified energy partition model has a high degree of fit with the actual temperature distribution of the large cutting depth grinding.The influence of grinding parameters,in which the grinding depth has the greatest influence.The simulation results show good agreement with the experiment results and can be used to predict the grinding temperature.