Date: 2025/8/11
Category: Metallurgical encyclopedia terms
Views: 378
Working principle:
Its basic principle is based on Faraday's law of induction, which states that when a conductor moves in a changing magnetic field, eddy currents are generated within the conductor, causing it to heat up.
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Classification by frequency and structure:
1. Frequency classificationUltra-high-frequency equipment (0.1 - 1.1 MHz): For high-precision local heating, such as tool quenching.
Horizontal push-type heating furnace: Patented design (CN222747722U), featuring four furnace bodies in series for continuous heating, solving the problem of large core-surface temperature difference in traditional longitudinal furnaces, with a 20% reduction in energy consumption and a smaller footprint.
The horizontal push-type billet induction heating furnace, including the furnace body, also includes: the conveying component, which is connected to the furnace body; The conveying components include the first conveyor belt and the second conveyor belt. The first conveyor belt is located directly in front of the feeding end of the furnace body. The second conveyor belt is located directly behind the discharge end of the furnace body. The support plate is fixedly connected beside the first conveyor belt. The pusher assembly is fixedly connected to the support plate. The utility model, by setting the device as a horizontal push feeding type, can reduce the space of the device. The four furnace bodies in the device continuously heat the steel billet for a long time, which can effectively heat the surface temperature of the steel billet to the core. When the billet is taken out, the core and surface temperatures of the steel billet are basically the same, solving the problem of large temperature difference between the core and surface of the steel billet in the longitudinal walking heating furnace, reducing heat loss, and reducing the production cost.
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Sliding coil type equipment: Patented structure (CN120264521A), with adjustable coil axis, suitable for various shaped billets (such as special-shaped pipes), improving heating uniformity by 30%.
This equipment includes an electric heating coil, a first conductive bar, a second conductive bar, an upper support plate and a lower support plate. The electric heating coil is in a spiral coiled structure, with a cylindrical heating cavity surrounded in the middle. The conductive sheets move along the axial direction through the first translation mechanism and the second translation mechanism, ensuring stable power transmission. In addition, an auxiliary electric heating coil is provided, which enhances the heating efficiency and uniformity.
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Application scenario analysis:
1. Pre-treatment for forging:
Defects of traditional induction heating furnaces
Steel materials such as rebar and section steel are made by heating continuous casting billets and then feeding them into rolling mills for rolling. The traditional methods for heating billets include heating in furnaces using natural gas, coal gas, or fuel oil.
The traditional induction heating furnace form is a longitudinal walking structure with multiple heating furnace bodies arranged in a row, and the billets are conveyed by the drive roller conveyor. The billets pass through each furnace body one by one in sequence, and the temperature gradually rises to the rolling temperature, and then are sent into the rolling mill.
However, traditional induction heating furnaces still have certain deficiencies when in use: The traditional heating furnace usually consists of two heating units, a total of six furnace bodies, as well as a feeding mechanism and a steel discharge track. The overall equipment occupies a relatively large area. Meanwhile, the heating method of the longitudinal traveling heating furnace is to heat one billet after another through the heating furnace. Each time, only one billet can be heated in the furnace chamber. Even if six furnace bodies are set up, The total heating time for each billet is still relatively short, and it belongs to the form of rapid heating. Even if a uniform temperature through heating zone is set up, there is still a temperature difference of about 50℃ between the core and surface of the billet after it is taken out of the heating furnace. This temperature difference may not meet the requirements for some varieties with high rolling requirements.
Technical advantages and economic benefits:
1. Energy efficiency improvement: Electrical-to-thermal conversion efficiency > 85%, saving 40% - 50% energy compared to coal-fired furnaces, with no exhaust emissions, meeting environmental protection requirements.3. Quality assurance: Core-surface temperature difference control ≤ 20℃ (patented horizontal push-type furnace), extending die life by 2 - 3 times, and product roughness < 50μm.
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