The Temperature Field And Stress Field Simulation Of Quenching Process Taps

Tap as an important internal thread processing tool, plays an important role in machinery manufacturing. Because the tap tap structure especially thread part, determines the tap in the heat treatment process especially the larger stress will quench cooling process, easy to cause deformation and cracking phenomena. Therefore, numerical simulation of quenching process on tap, simulation of the temperature field and stress field, can avoid the occurrence of various heat treatment defect.Through the computer numerical simulation technology, integrated the theory of heat transfer and thermal elastoplastic related knowledge, using finite element analysis software Ansys, establish the three-dimensional finite element model of quenching process of taps, considered in the calculation of material thermal parameters and cooling medium parameters change with temperature, by using the method of thermal stress coupling, to calculate the temperature field of quenching process taps and stress field, analyzes the organization field.Based on the M10 × 1.5 taps for quenching cooling process in the oil medium numerical simulation, obtains the tap for the temperature distribution that the surface temperature is low, the heart part of high temperature; stress field distribution for the equivalent cutting edge at the tip of the minimum stress, equivalent cutting edge groove at the bottom of the maximum stress, stress increased first and then decreased, at about 1s equivalent stress reaches the maximum value 309MPa. The maximum residual stress also appeared in the root of the thread,5.06MPa.Tap on the different size, different material was calculated by numerical simulation of quenching process under different cooling medium, obtains the workpiece size is smaller, the faster the cooling, the temperature difference between inside and outside is smaller, so the quench cooling process of stress is smaller, the residual stress is smaller; the heat conduction coefficient of different materials larger effects on temperature in the process of quench cooling, heat conduction coefficient is big, the inner layer to the outer heat transfer more quickly, the temperature difference between the inner layer and the outer layer of the smaller, the workpiece internal stress. So for the thermal conductivity of material with large cooling medium is faster; the convection heat transfer coefficient of different cooling medium to large effects on temperature during quenching, the convective heat transfer coefficient is big, the workpiece surface heat quickly through the medium of convection and transfer to a cooling medium, so that the workpiece surface temperature decreased rapidly, large temperature difference between inner and outer layer, internal stress.