Numerical Analysis Of Spot Induction Hardening Of Curved Surface Mould

Automobile panel die is bulky and has a complicated structure, high requirementof geometric accuracy and surface quality, normal surface hardening method isdifficult to be used on the automobile panel die. The inductor in spot inductionhardening (SIH) method move in a complex trajectory on curve surface mold, whichcan assembled to a five-axis cooperating CNC (Computer numerical control) machinetools to realize spot continual induction hardening process. In this paper, on the basisof the characteristics of spot induction hardening, the SIH process of plane and curvedsurface model is simulated with the use of the flow of coupling calculation of theuniversal FEM software ANSYS. A series of experiments of1045steel wereconducted to verify the model.Firstly, the process of stationary spot induction hardening of plane is simulated byANSYS and the law of temperature evolution is obtained. A program is composed inthe APDL language in ANSYS to predict the micro-hardness and microstructuredistributions in simulation according to the maximum heating temperature and theaverage cooling rate of CCT curves. A secondary development was carried out inANSYS. A series of experiments of1045steel were conducted. The simulation resultswere in good agreement with experimental results. The results show that the computersimulation by finite element method could be applied to the spot induction hardeningprocess and has the instruction significance to the actual project.Secondly, the spot continual induction hardening model is built in ANSYS basedon the model of stationary spot induction hardening, and the variation of temperaturedistribution in surface and in depth during heating is obtained by numerical simulation.The microstructure distributions in simulation were carried out. The temperaturedistributions and microstructure distributions with different parameters (current) werealso obtained.In the end, the spot continual induction hardening of curved surface model wasbuilt based on the finite model of plane. The law of temperature distribution andevolution with different parameters (such as velocity and radius) during the processwere obtained. A prediction of micro-hardness and microstructure distributions insimulation was carried out.