Equipment induction heating heat treatment is mainly composed of a power supply device, quenching machine tool, and inductor. The main role of the power supply is an alternative alternating current. High frequency current power supply has two types of electronic tube high frequency generator and thyristor. The intermediate frequency current power supply is a generator set. The general power supply can only output a frequency of a frequency, and some devices can change the current frequency, or may be induced directly with a 50-ht-frequency current frequency current.
The selection of the power supply is related to the depth of the heating layer required by the workpiece. The workpiece of the heating layer should use a low current frequency; the shallow workpiece of heating layer should use a power supply device with a high current frequency. Another condition for selecting a power supply is the device power. The heating surface area is increased, and the power supply power needs to be increased. When the heating surface is too large or when the power supply is insufficient, a continuous heating method can be used to move the workpiece and the inductor to be relatively moved, and the front is heated, and the rear is cooled. But it is best to heat the entire heating surface. This allows heat to heat the quenching surface to heat, so that the process is simplified, and electrical energy can also be saved.
The main function of the induction heating quenching machine is to position the workpiece and make the necessary movement. It is also possible to attach a device for providing a quenching medium. The quenching machine can be divided into standard machine tools and special machine tools. The former is suitable for general workpieces, and the latter applies to a large number of complex workpieces.
When performing induction heating heat treatment, in order to ensure the quality of heat treatment and improve thermal efficiency, the appropriate sensor must be designed and manufactured according to the shape and requirements of the workpiece. Common sensor has an outer surface heating sensor, an inner heating sensor, a flat heating sensor, a general-purpose heating sensor, a special heating sensor, a single heating sensor, a composite heating sensor, a smelting heating furnace, etc. .
High-frequency high-power sensing heating devices have been used as switching devices for many years. Due to the short life of the tube, the efficiency is low (50% -70%) load stability, intermittent oscillation (voltage type inverter) occurs in light-load operation inverter output voltage, so IGBT semiconductor is used in high-frequency high-power applications. The device is instead of the electronic tube device. The sensing heating device using the IGBT semiconductor device has high efficiency and simple circuit. Manufacturing and use is more convenient, using IGBT high-power sensing heating power supply has a rapid temperature rise, easy to control, and cultivate less process quality. Therefore, IGBT is used to achieve high-power sensing heating power supply is a wise choice.