Vacuum Induction Furnace Summary

Vacuum induction furnace: Vacuum induction furnace is an important equipment in vacuum smelting. The problem of vacuum sintering exists in the process flow of product smelting with or without cutting. The purpose of sintering is to sinter the expected blank into a preform for hot forging, and to ensure good malleability and ductility structure, so as to avoid defects in hot forging. Vacuum smelting furnace is mainly used for smelting precision alloys, electromagnetic materials, alloy steel and high temperature materials.

Vacuum induction furnace is divided into discontinuous type and semi-continuous type. Furnaces with capacity less than 150 kg are mostly directional type. Furnaces with capacity of 150-300 kg have both. More than 500 kg are semi-continuous. Large-scale vacuum induction furnaces of 5-7t are more in foreign countries. Vacuum induction furnaces used in smelting industry in China are mainly small and medium-sized, and are now developing towards large-scale ones.

Vacuum acquisition is still a key problem in the design and application of vacuum induction furnace. Because the temperature in the vacuum induction furnace is about 2000 C, it is difficult to reach 10-0 Torr or higher vacuum at this temperature. According to the introduction of relevant information at home and abroad, the improvement of smelting quality is obviously related to vacuum degree. For this reason, users hope that the vacuum induction furnace designed can achieve 10-8 Torr or higher vacuum degree. At present, it is relatively easy to achieve 10-5 Torr vacuum degree.

Vacuum system of vacuum induction furnace consists of mechanical pump-booster pump or mechanical pump-diffusion pump to achieve 10-5~10-5 Torr vacuum, sometimes with Roots pump. The further improvement of service life and performance of vacuum units is still a subject that needs to be further discussed and solved in practical work.

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