Inductive heating Hot pressing

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figure i: conventional inductive heating


in process heat produced within mould when subjected high frequency electromagnetic field, generated using induction coil coupled electronic generator. mold made out of graphite or steel, , pressure applied 1 or 2 cylinders onto punches. mold positioned within induction coil. advantage here pressure , inductive power independent. powders liquid phase amenable process , low pressures possible, too. among disadvantages expense of high-frequency generator , need proper alignment. if mold placed off centre, heat distribution uneven. main disadvantage dependence of process on inductive coupling , thermal conductivity of mold. magnetic field can penetrate mold 0.5mm 3mm. there on, heat has transported mold thermal conductivity of mould material. uniform heating more difficult if air gap between mold , inductive coil not same along mould profile. potential problem heating rate. high heat rate result in high temperature differences between surface , core can destroy mold.








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