Calculation Of Plasma Arc Surface Quenching Heat Source Parameters And Optimization Of Process Parameters

This paper use the existing plasma arc theory to establish the algorithm of Gauss heat source parameters and the temperature field of plasma arc hardening is simulated by computer simulation technology. Combined with the experimental methods,the correctness of the algorithm is verified. Then the effects of the process parameters for quenching hardening layer depth and width is studied.Based on the channel model theory and Maecker linearization method,the volt ampere characteristics is calculated given a channel diameter, and the algorithm of Gauss heat source curve shape factor’k’is theoretically established combined with plasma arc surface hardening process, and gives the main program. Using the algorithm,the heat flux distribution is calculated along a given current, and the hardening layer depth and width is obtained by simulation of ANSYS. By comparing the simulated results with the experimental results,they are in good agreement with the error range and thus the correctness of the calculation method is verifiedFocus on the study of the effects of process parameters (arc current, channel diameter, channel length, source speed) for quenching hardening layer depth and width. And the process parameters is changed (including single variation and a combination change of two parameters) according to certain rules. Using established algorithm, the parameters of’k’and heat flux density of arc column is calculated. Through the simulation of ANSYS software, the hardening depth and width is so obtained. Draw curves of the results and fit them to appropriate functions.The results show that the depth and width of the hardened layer increases with the increase of the arc current and the channel length, and decreases with the increase of the channel diameter and the moving velocity of the heat source. These process parameters have an effective range, and the outside range either make the workpiece not quenched, or make the workpiece surface melting, so as not to the expected hardening effect. The fitting functions of each process parameter provide a reliable mathematical basis for the optimization process parameters of the actual plasma arc surface quenching, which has important engineering significance.