Metal Induction Heat Treatment with Explosion-proof Electric Heaters

The goal of induction heat treatment of metals using explosion-proof electric heaters is to heat the metal to a specific temperature distribution. For example, in hot rolling, not only does it require a specific surface temperature, but the workpiece temperature must also be uniform, with minimal temperature differences between the radial and axial directions. Rolling at this specific temperature ensures efficient energy utilization while keeping rolling forces within a normal range, facilitating rolling. Similarly, in quenching, in addition to surface temperature requirements, there are also different requirements for the thickness of the heated layer. All of these require the proper selection of process parameters such as heating power and heating time. However, in actual production, the complexity of the production process and the imprecision and randomness of manual control can lead to two undesirable situations: excessive heating power and insufficient heating time.

Although the surface temperature of the billet has reached the required level, the internal temperature distribution within the billet may not meet the required process temperature distribution, impacting subsequent processing. For example, if the billet is not heated thoroughly during the rolling process, resulting in excessive hardness, this not only significantly impacts the quality of the hot-formed finished and semi-finished products, damaging the product's reputation, but also gradually cracks the rolls used to roll the billet, severely shortening their lifespan and rendering them unusable in just a few months or even a month. Roller costs are generally high, resulting in significant losses for the factory. Secondly, insufficient heating power and excessively long heating times can increase scale content and waste energy. With rising energy prices and a growing energy crisis, this situation should be avoided as much as possible to conserve energy.

Excessively long heating times also reduce factory productivity and increase product costs. In short, the heating temperature within the heating furnace not only affects the furnace's energy consumption and workpiece burnout, but also affects subsequent processes. Maintaining the workpiece temperature within a reasonable range ensures product performance while minimizing the overall energy consumption of the heating furnace and subsequent equipment. Therefore, effectively controlling the heating temperature within complex production processes is a pressing issue. To effectively control the heating temperature, the most critical thing is to determine the core temperature of the billet while determining the surface temperature of the billet. However, with current temperature measurement technology, it is difficult to directly measure the core temperature of the heated billet using instruments.