Simulation And Experimental Study On Microstructure&Drilling Tool Wear Of Thin Plate Deep Hole Processing

Machining deep hole on thin plate based on friction heat is a kind of green machining process without dust and coolant.Metal streamline distribution is more reasonable,mechanical properties are better because of the hole wall obtained by the thermal deformation of materials.Using good thermoplastic of thin plate and a lot of heat originated in friction between the drilling tool without cutting bit rotating with high-speed rotation and the plate,and the deep hole on thin plate is stretched when the temperature of plate reaches its recrystallization temperature.The hole has good mechanical properties.The research lays the foundation for further processing thread or inlaying bearing.This paper uses DEFORM-3D finite element simulation software as a platform.It not only conducted the finite element simulation on temperature field in different deformation zone and recrystallization distribution of the process of stretching sheet into the hole,but made the stimulation analysis on the streamline drill wear and metal distribution after deformation as well.At the same time,the experiments were conducted to verify the simulation results.Specific work is as the following:Based on the classical theory of friction and shear friction theory,endothermic mathematical formula of sheet metal is made according to the theoretical model of friction heat of thin plate in the process of deep hole processing with the cone spherical drilling tool;materials recrystallization model coupled to the DEFORM software can realize the analysis of deformation-heat transfer-microstructure in the process of deep hole processing.The optimum technological parameters of the process are obtained by using the DEFORM-3 D software in a group of parameters of hot process by finite element simulation,through its recrystallization fraction and distribution.The wear forms of carbide drilling tool are analyzed by the finite element simulation technology and experiment;the comprehensive performance of thermal deformation zone are studied through distribution of the deformation zone hardness and simulation of deformation process of sheet metal streamline.The researches provide the prerequisite for assembly and processing internal thread in the hole.