It mainly includes various heating furnaces and heating devices. In the heat treatment equipment, various resistance furnaces are widely used. It is a furnace that takes electricity as energy, converts electric energy into heat energy through the electric heating elements in the furnace, and heats the workpiece. Heating devices include direct electric heating devices, contact electric heating devices, flame heating devices, induction heating devices, laser heating devices, etc
The equipment of induction heating heat treatment is mainly composed of power supply equipment, quenching machine tool and inductor. The main function of power supply equipment is to output alternating current with appropriate frequency. There are two kinds of high-frequency current power supply equipment: electronic tube high-frequency generator and silicon controlled frequency converter. The medium frequency current power supply equipment is a generator set. Generally, power supply equipment can only output current of one frequency. Some equipment can change the current frequency, or directly use 50 Hz power frequency current for induction heating.
The selection of power supply equipment is related to the required heating layer depth of the workpiece. For the workpiece with deep heating layer, the power supply equipment with low current frequency should be used; For workpieces with shallow heating layer, power supply equipment with high current frequency should be used. Another condition for selecting power supply equipment is equipment power. As the heating surface area increases, the power required increases accordingly. When the heating surface area is too large or the power supply is insufficient, the continuous heating method can be used to make the workpiece and the sensor move relatively, heating in the front and cooling in the back. But it is better to heat the whole heating surface at one time.
In this way, the waste heat in the center of the workpiece can be used to temper the hardened surface, so as to simplify the process and save electric energy. ?
The main function of induction heating quenching machine tool is to position the workpiece and make necessary movement. In addition, a device for providing quenching medium shall be attached. Quenching machine tools can be divided into standard machine tools and special machine tools. The former is suitable for general workpieces, and the latter is suitable for complex workpieces produced in large quantities. ?
When conducting induction heating heat treatment, in order to ensure the quality of heat treatment and improve the thermal efficiency, we must design and manufacture sensors with appropriate structure according to the shape and requirements of the workpiece. Commonly used inductors include outer surface heating inductor, inner hole heating inductor, plane heating inductor, universal heating inductor, special heating inductor, single heating inductor, composite heating inductor, smelting furnace, etc. ?
High frequency and high power induction heating devices have been using electronic tubes as switching devices for many years. Due to the short service life, low efficiency (50%-70%) and poor load stability of the electronic tube, the output voltage of the inverter appears intermittent oscillation (voltage source inverter) during light load operation. Therefore, it is imperative to use IGBT semiconductor devices to replace electronic tube devices in high-frequency and high-power occasions. The induction heating device using IGBT semiconductor devices has high efficiency and simple circuit. It is convenient to manufacture and use. Using IGBT high-power induction heating power supply has the advantages of fast temperature rise, easy control, less curing and decarburization, and reliable process quality. Therefore, using IGBT to realize high-power induction heating power supply is a wise choice. The power control board produced by our company has digital trigger, debugging free, low pulse distortion, strong anti-interference ability, centralized control, fast dynamic response speed, and various state protection indications.