Luoyang HongtengIntermediate frequency induction furnace
Heat Radiation in Industrial Furnaces Heat radiation often plays a dominant role in the total heat-transfer process between furnace gases and heated workpieces. In several types of furnaces—such as resistance furnaces and muffle furnaces—radiation from heating elements and furnace walls becomes the primary and sometimes the only means of transferring thermal energy to the material being processed. What Is Heat Radiation? The term heat radiation refers to a complex process composed of multiple continuous stages.It begins when the thermal energy stored within a material is converted into radiant energy. This radiant energy then propagates in all directions, and once it encounters another object, it is fully or partially transformed back into heat. From a physics standpoint, thermal radiation behaves identically to visible light radiation. Both are electromagnetic waves; the only difference lies in their wavelength. Therefore, many laws that govern visible light—such as reflection, refraction, and propagation—also apply to heat radiation. Key physical characteristics include: Thermal radiation travels in straight lines through homogeneous and isotropic media. The intensity of radiant energy decreases with the square of the distance from the radiation source. Laws of reflection and refraction apply equally to thermal radiation. Although we describe radiation or absorption as occurring...
Introduction to Convective Heat Transfer Inside Industrial Furnaces In earlier discussions, natural convection under free-flow conditions was used to explain heat exchange mechanisms such as heat loss through furnace walls, air ducts, gas ducts, and steam pipes. These principles are useful when estimating external thermal losses, but they cannot be directly applied to the heat transfer that occurs inside a furnace chamber. The main limitation is that the flow and temperature conditions inside a furnace often fall outside the range of traditional experimental data. Additionally, the surrounding refractory structure influences gas movement and temperature distribution in ways that do not exist in open-air convection studies. Because of these factors, classical equations for natural convection are not recommended for furnace interior heat-transfer analysis. Why Free-Convection Formulas Do Not Apply Inside a Furnace Several fundamental issues prevent direct application: 1. Flow conditions exceed tested ranges The temperature inside a heating furnace is significantly higher than the experimental conditions used to derive natural convection equations. Gas velocity and turbulence also differ substantially. 2. Wall influence on gas flow Furnace walls create strong thermal gradients and complex interaction patterns, altering flow velocity and direction. 3. Gas mixture properties differ from pure air Natural...
Heat Conduction Through Solids and Liquids: Fundamentals, Behavior, and Temperature Distribution Inside Materials Heat can be transferred through a solid without any physical displacement of its internal parts. Similarly, heat can move through a liquid as long as the trajectories of its particles do not intersect. Both situations represent pure heat conduction, where thermal energy flows solely due to temperature differences rather than bulk motion. When heat is transferred perpendicular to the direction of liquid flow, the process is also governed by conduction. Understanding heat conduction within solid materials is particularly valuable because it mirrors what happens during the heating of manufactured products, where thermal energy penetrates from the surface into the interior. Likewise, heat loss from a furnace to its surrounding environment occurs due to conduction through the furnace wall. In essence, all heating and cooling processes of objects are fundamentally linked to conductive heat transfer inside solids. Temperature Change Inside a Heated Object Consider an object whose internal temperature is uniform at the initial moment. When a specific point on the object is heated by an external heat source, and the temperature at various interior points is measured over time, we observe that: The temperature at every internal...
Induction Heating in Plastic Processing Introduction In thermosetting plastic processing, methods such as compression molding, injection molding, and extrusion are commonly used. During the polymerization (curing) process, both heat and pressure play essential roles. While molds, injection cavities, and extrusion barrels can be heated using gas, steam, or resistance heating, induction heating offers higher thermal efficiency, faster heating speed, and more precise temperature control. How Induction Heating Works in Plastic Processing Induction coils are installed directly onto the mold body. When alternating current flows through the coil at the power supply frequency, heat is generated within the mold. These coils can also be mounted on appropriate components of injection molding machines and extrusion lines, enabling localized heating in the same manner. This prevents excessive temperature fluctuations and reduces power loss, while achieving rapid thermal response and significantly lower heat dissipation. For mold sizes of 750 mm square and above, three-phase power is used. For smaller molds, both single-phase and three-phase induction heaters can be applied, depending on the equipment design and heating requirements. Induction Heating for Extrusion Barrel Heating Induction heating is also well-suited for heating extrusion barrels. Traditional heating methods such as gas, steam, or resistance heaters typically result...
How to Choose the Best Mini Rolling Mill for Jewelry in 2025 Whether you’re texturing sheet metal, reducing wire thickness, or experimenting with pattern rolls, having the right mini rolling mill makes all the difference. But with so many options out there—from budget-friendly models on Amazon to trusted names like Durston—how do you know which one is truly worth your money in 2025? Let me walk you through what really matters when choosing a mini rolling mill for jewelry making today. Understanding the Mini Rolling Mill Let’s start simple. What exactly is a mini rolling mill? At its core, it’s a bench-top machine that uses two hardened steel rollers to compress and shape metal. Turn the handle, feed in your silver, gold, copper, or brass, and out comes uniformly thinner sheet or perfectly drawn wire. Now, why go “mini”? Because full-sized mills can take up serious workspace—and cash. A compact model gives you professional results without needing a dedicated studio. That’s especially valuable if you work from home, teach workshops, or travel to markets. And honestly, most small-scale jewelers don’t need industrial power. You want precision, consistency, and durability—not something that weighs 100 pounds. According to Ganoksin’s guide, no jewelry studio is complete...
Steel Strip Processing Equipment To achieve consistent results in pipe production, the performance and precision of the raw materials—specifically the steel strip—are absolutely critical. The quality of the purchased material must meet strict standards, and its dimensions should remain as uniform as possible. Even a width deviation of just 0.25% can cause complete weld failure when the thickness tolerance reaches half of the allowable range. Under ideal welding conditions, when both edges of the steel strip are pressed together with just the minimum required pressure to form a uniform weld across the entire cross-section, the importance of material consistency becomes clear. 1. The Importance of Precision in Steel Strip Dimensions With modern cutting technology, achieving the required dimensional accuracy is fully possible. However, the direction of the sheared edge plays a key role in determining weld quality and roller wear: If the sheared edge curls upward, roller wear decreases significantly—but it can result in a larger internal weld seam, which is undesirable for the final product. If the sheared edge curls downward, the internal weld seam becomes smaller, creating slightly better welding conditions. Yet, this may increase roller wear and slightly reduce the cross-section of the weld zone. Both factors...
Induction Steel Melting Furnace
Aluminum Induction Melting Furnace
Stainless Steel Induction Melting Furnace
Medium Frequency Gold Induction Melting Furnace
Small Medium Frequency Induction Furnace
Aluminum/Copper Ingot Continuous Casting Line
Please fill out the form below (required *), send us a short message, and we will contact you as soon as possible.
Send Message
Copyright © 2021 Luoyang Hongteng Electrical Equipment Co., Ltd.
