The purpose of metal heating is to improve metal plasticity and reduce deformation resistance, so as to facilitate metal plastic deformation and obtain a good post-forging metallographic structure. Therefore, metal heating plays an important role in warm and hot forging and is an indispensable and important process. For the heating and heat treatment of metals, the most commonly used equipment at present is the medium frequency induction heating machine, which has very good results.
Induction heating uses electromagnetic induction heating to directly heat metal blanks. Put the metal blank into a spiral coil (induction coil) that passes alternating current. The coil generates an induced electromotive force and forms a strong eddy current on the surface of the blank, which converts the electrical energy inside the blank directly into thermal energy to heat the blank.
The advantages of using a medium frequency induction heating machine for heating are fast heating speed (1.7cm/min-2.5cm/min) and a total efficiency of 50%-60%. During induction heating, the air around the blank does not flow strongly and there is less oxidation and decarburization. , good heating quality, no pollution to the environment, easy temperature control, little metal burning loss, general burning loss rate is about 0.5%, simple operation, stable work, easy to implement mechanization and automation. However, there are strict restrictions on the shape and specifications of the billet, so it is generally necessary to equip a high-temperature box-type resistance furnace or a flame-heated box-type furnace to heat the forgings that need to be repaired.
Medium frequency induction heating machines are usually composed of power supply, inductor, capacitor bank, contactor and electric control device. The actual unit electric energy consumption during heating is (0.4-0.5) kwh/kg (low alloy structural steel heating temperature 1200℃-1250℃ ).
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GS-ZP-1200
