Safety What is the hazard of using flange heaters to heat the weld line? When using flange heaters to heat, in the forefront of the melt, the personal behavior of fluidity is very complicated, and its fluidity method is like a musical fountain. , Emerges from the Zhongzhoubai at the forefront of the liquid, and flows into the boundary layer of the mold cavity.
In this type of situation, when the forefronts of the two liquids meet, the liquid at the management center first touches, resulting in a welded area, and then develops axially from the management center to the mold wall, and finally a welded area. Therefore, the weld line is the boundary line produced by the welding of two or more melt fluidity frontiers in the cavity, and the thickening of the plastic part increases the friction resistance of the mold during forming.
In recent years, flanged heaters have been widely used in intermediate frequency forging in industrial production, including heat treatment of transmission gears and shafts. Flange heater is a kind of three-phase DC AC current, after the rectifier into a DC power supply, and then the DC power supply into an adjustable amount of current, to provide the current through the magnetic effect of the capacitor and the current in the electromagnetic coil The magnetic field creates high-density magnetic lines of induction in the magnet coil, and laser cuts the metal material and polymer material contained in the magnet coil, causing very large vortices in the metal material and polymer material.
This type of vortex also has some characteristics of the high-frequency current, that is, the free charge of the metal material itself causes heat to be generated by the mobility of the metal material body with the resistor. Along with the development trend of control system software and power engineering semiconductor components, the solid flange heater switching power supply also has a rapid development trend. Since the 1950s, a U.S. company developed and designed the world’s first commercialized thyristor product, the solid flange heater electronic power supply has received widespread attention in the global context and has been carried out. In-depth application research, its appearance has brought about a new reform to the technical nature of high-frequency magnetic induction heating and the entire power electronic technology industry.
With the deep level of scientific research and the necessity of application, high-frequency magnetic induction heating technology and flange heater switching power supply will eventually suffer further development trends and more general applications. In the high-frequency (above 100kHz) category, overseas forwards are connected with a transistor-based full-solid switching power supply led by modular design and large-space MOSFET power electronic devices. In 1989, France developed a current type MOSFET magnetic induction heating equipment with a volume of 485kW/50～200kHz; Italy also produced a current type MOSFET flange heater switching power supply with a volume of 605kW/405kHz: the United States Yingda Enterprise also released 2000Kw/400KHz MOSFET flange heater.
Application of flange heater induction hardening:
1. The heating rate is very fast, which can expand the temperature range of body A and reduce the change time.
2. After heat treatment, ultra-fine cryptocrystalline austenite can be obtained on the surface of the product workpiece, and the strength is slightly higher (2～3HRC). Lower ductility and higher fatigue limit.
3. The product workpieces subjected to this treatment process are not easy to be oxidized and carburized by air, and even some product workpieces can be installed immediately for safety applications.
4. The hardened layer is deep, easy to control the actual operation, and easy to complete the mechanical automation and automation technology.
