Research On Die Design For Cavity Of Electromagnetic Induction Semi-solid Magnesium Alloy

Semi-solid metal forming technology is considered as a potential short-process and near-final forming technology,which has a huge market demand.It is difficult to obtain the technological parameters of semi-solid billet prepared by electromagnetic induction.The electromagnetic field and temperature field of the workpiece are simulated and analyzed by finite element method,which provides an effective means for determining and adjusting the optimum technological parameters of electromagnetic induction.In this paper,the cylindrical blank of quantitative AZ80 M is taken as the research object.The electromagnetic field and temperature field inside the sample under different high-frequency electromagnetic induction are simulated by the finite element analysis program ANSYS.The power and semi-solid billet metallographic microscopy are studied.The law of organization;semi-solid molding dies were designed.Induction heating quickly heats the material to a semi-solid state,allowing only a few tens of seconds to warm a specified amount of billet to a semi-solid temperature range.For the high-frequency induction heating process,the finite element method is used to simulate the electromagnetic field and temperature field of the size sample.The simulation results show that the temperature of the sample gradually increases from the core to the edge.The smaller the induction heating input power,the slower the sample heating rate and the more uniform the temperature field distribution.The results of metallographic microstructure analysis of semi-solid billets: the liquid phase rate at the edge of the blank sample is higher,and the morphology of the material is also different.The point-like liquid pool in the solid phase crystal at the edge is also larger,and is concentrated into a strip-shaped liquid pool..The splitting system,inner mold and outer mold system of the semi-solid molding die were designed.A unique shunt module was designed during the injection process,and the material was evenly shunted from the injection port to the inside of the cavity of the molding model by means of nesting up and down.This design also simplifies the demolding process.A relevant stripping groove is provided in the lower part of the forming mold to ensure that the cavity can be sufficiently filled.