High-frequency induction furnace

Japanese: 高周波誘導炉 - こうしゅうはゆうどうろ（英語表記）high-frequency induction furnace

A furnace that heats with eddy currents generated by high-frequency electromagnetic induction. When a water-cooled copper tube is wound into a coil and a high-frequency current is passed through it, and a metal is placed in the center of the coil, eddy currents are generated inside the metal and it is heated. For metals, the current used is usually 0.15 to 400 kHz. For large-capacity melting, thyristor or generator types are mainly used, and for small furnaces, vacuum tube oscillator types are mainly used. For large capacity, the power supply unit is large, but since it is self-heating, the furnace body can be made small and it is easy to make it into a vacuum or any atmosphere. It is used for melting high-purity metals and high-grade alloys, and for zone melting. It is also widely used for surface hardening (→ Steel Surface Hardening Method), in which only the surface of the steel is rapidly heated and hardened, taking advantage of the rapid heating and skin effect caused by high frequency waves.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

高周波電磁誘導による渦電流で加熱する炉。水冷銅管をコイルに巻いて高周波電流を流し，コイルの中心に金属を置けば，金属内部に渦電流を生じて加熱される。金属用の場合使用電流は通常 0.15～400kHz。電源は大型溶解用にはサイリスタ式および発電機式，小型炉には真空管発振式がおもに用いられる。大容量の場合は電源装置が大きくなるが，自熱式なので炉体は小型にでき，真空や任意の雰囲気にもしやすい。高純度金属や高級な合金の溶製，ゾーンメルティングに用いられる。また加熱が急速でかつ高周波による表皮効果があることを利用し，鋼材表面だけを急熱して焼入れる表面硬化 (→鉄鋼表面硬化法 ) にも広く用いられている。

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