On 2018-08-08 14:48:54
High frequency quenching heat treatment technique
Simply put, high-frequency quenching is a heat treatment that involves only the necessary areas of heating or cooling components, which is also known as induction quenching and abbreviated as IH.
(1) use electromagnetic induction: electromagnetic induction involves bringing two coils close to each other - coil A is connected to A power source and coil B is isolated (the coils are not in contact with each other) - and then generating A magnetic field by switching on the power source, which immediately causes the current in coil B to do the same. The same thing happens when the power is turned off. Induction in coil B is called electromagnetic induction.
(2) use induced current to heat the part: coil B is replaced by the actual part (metal) into which the current will flow, using the current induced by electromagnetic induction (eddy current).
When current flows into the component, the resistance generates joule heat, causing the component itself to heat up. In this way, the heat is effectively applied using the direct heating method.
(3) heat is applied only to the desired area and depth: heat is then applied only to the necessary area by machining the shape of coil A to simulate the shape of the area of the part to be treated.
The higher the frequency of the power supply, the more current is concentrated on the surface of the component. This is called the skin effect. The frequency can be selected according to the part shape (size) and the required hardness depth.