| This paper mainly studies high-manganese steel frogs before mechanical impact hardening,the high manganese steel frog is heated by electromagnetic induction heating,bring its surface and specific internal depths to temperature,improve the surface hardness and hardening layer depth of high manganese steel frogs,increase its service life.The main contents of this article include:ANSYS software was used to establish a multifield coupling model of electromagnetic-thermal-motion induction heating of high manganese steel frog.The coupling calculation of the electromagnetic-thermophysical environment is completed by sequential coupling,Dynamic induction heating of high manganese steel frog is achieved by establishing macro files and cyclic commands of DO.Based on the heating requirements of high manganese steel frogs,a comprehensive method of dynamic "buffer heating" and "variable pitch heating" is proposed to carry out dynamic induction heating of high manganese steel frogs.Because the heating effect of various coils in static simulation cannot meet the heating requirements,the corresponding induction coil is then determined,depending on the coil movement,a superposition of high temperature zones is generated during the heating process,the method of "buffer heating" is proposed to carry out dynamic induction heating of high manganese steel frogs.It is aimed at the requirements that the surface temperature of high manganese steel frog does not exceed 300 ℃,a surface temperature control method for "variable-pitch heating" of the frog during the heating process is proposed,the results of the obtained temperature field and electromagnetic field are analyzed.Explore the influence of individual process parameters on the heating quality and temperature requirements of the forg.Compare the difference in temperature fields obtained by variable and unpitch heating,the advantages of dynamic "variable spacing heating" are derived.The effects of current density,current frequency and moving speed on the heating quality and temperature requirements of high manganese steel forgs were specifically analyzed,the relevant equations are summarized,predict the temperature trend at the critical point at a depth of 15 mm of the forg.Then by changing the way the current density,increase the heating rate of the induction coil,temperature requirements can still be met,it provides an idea for segmented variable speed heating of the entire forg.Experimental verification by laboratory equipment,temperature measurement using thermocouple temperature measuring device,analyze the temperature change curve and temperature difference of the temperature measurement point in experiments and simulations,the accuracy of the simulation and the feasibility of the simulation scheme are verified. |
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