Induction Heating Furnace Introduction
Induction heating furnace is a type of heating furnace. This eddy current also has some properties of medium frequency current, that is, the free electrons of the metal itself flow in the resistive metal body to generate heat. For example, a metal cylinder is placed in an induction coil with alternating medium-frequency current. The metal cylinder is not in direct contact with the induction coil. The temperature of the energized coil itself is already very low, but the surface of the cylinder is heated until it turns red or even melts. , and this redness and melting speed can be achieved by adjusting the frequency and the strength of the current. If the cylinder is placed in the center of the coil, the temperature around the cylinder will be the same, and the heating and melting of the cylinder will not produce harmful gases or strong light to pollute the environment.
Features of Induction Furnace
Induction heating furnace series melting furnace features (1) High melting efficiency, good power saving effect, compact structure and strong overload capacity (2) The temperature around the furnace is low, there is less smoke and dust, and the working environment is good. (3) The operation process is simple and the smelting operation is reliable. (4) The metal composition is uniform. (5) The melting temperature rises quickly, the furnace temperature is easy to control, and the production efficiency is high. (6) The furnace has high utilization rate and is easy to replace. (7) The long arc-shaped yoke shields magnetic flux leakage and reduces external magnetic resistance. It shields the magnetic flux leakage at both ends of the coil. The arc-shaped yoke cross-section is seamlessly attached to the inner wall of the outer wall, increasing the effective magnetic permeability area and making the lower coil Got better support. The unique forward and reverse rotation coil greatly improves the efficiency of the system.
Induction heating furnace series diathermy furnace features
Fast heating speed, high production efficiency, less oxidation and decarburization, saving material and forging die costs There is no need to worry about the waste of billets heated by the coal furnace due to power outages or equipment failures. Due to the fast heating rate of this heating method, there is very little oxidation. Compared with coal-fired furnaces, each ton of forgings can save at least 20-50 kilograms of steel raw materials, and its material utilization rate can reach 95%. Because this heating method heats evenly and the temperature difference between the core and the surface is extremely small, it also greatly increases the life of the forging die in terms of forging, and the surface roughness of the forging is less than 50um. Excellent working environment, improve workers’ working environment and company image, no pollution, low energy consumption Compared with coal furnaces, induction heating furnaces no longer subject workers to the baking and smoke of coal furnaces under the scorching sun. They can also meet various index requirements of the environmental protection department, and at the same time establish the company’s external image and the future development of the forging industry. trend. Induction heating is the most energy-saving heating method among electric heating furnaces. Heating a ton of forgings from room temperature to 1100°C consumes less than 360 degrees of electricity. Heating is uniform, the temperature difference between the core and the surface is extremely small, and the temperature control accuracy is high Induction heating generates heat within the workpiece itself, so the heating is uniform and the temperature difference between the core and the surface is extremely small. The application of temperature control system can achieve precise control of temperature and improve product quality and qualification rate. Induction heating furnaces have the advantages of small size, light weight, high efficiency, excellent thermal processing quality and favorable environment. They are rapidly replacing coal-fired furnaces, gas furnaces, oil-fired furnaces and ordinary resistance furnaces. They are a new generation of metal heating equipment. Equipment advantages The induction heating furnace is a power supply device that converts 50HZ power frequency alternating current into intermediate frequency (above 300HZ to 1000HZ). It rectifies the three-phase power frequency alternating current into direct current, and then converts the direct current into an adjustable intermediate frequency current, which is supplied by The medium-frequency alternating current flowing through the capacitor and induction coil generates high-density magnetic lines in the induction coil, cutting the metal material contained in the induction coil, and generating large eddy currents in the metal material. Since the principle of medium frequency induction heating is electromagnetic induction, the heat is generated in the workpiece itself. Ordinary workers using the medium frequency electric furnace can continue the forging task ten minutes after going to work. There is no need for professional furnace workers to burn and seal the furnace in advance. . Due to the fast heating rate of this heating method, there is very little oxidation. The oxidation and burning loss of forgings heated by medium frequency is only 0.5%, the oxidation and burning loss of gas furnace heating is 2%, and the coal-fired furnace reaches 3%. The medium frequency heating process saves materials. Compared with coal-fired furnaces, it saves at least 20-50 kilograms of steel raw materials per ton of forgings.
Safe operation of Induction Furnace
- Before starting the furnace, check whether the electrical equipment, water cooling system, sensor copper tubes, etc. are intact, otherwise it is prohibited to open the furnace.
- If the melting loss of the furnace exceeds the regulations, it should be repaired in time. It is strictly prohibited to smelt in a crucible with excessive melting loss.
- There should be a dedicated person responsible for powering on and starting the furnace. It is strictly forbidden to touch the sensor and cable after powering on. Personnel on duty are not allowed to leave their posts without authorization and must pay attention to the external conditions of the sensor and crucible.
- When charging, check whether there are flammable, explosive and other harmful items mixed in the charge. If any, they should be removed in time. It is strictly forbidden to add cold materials and wet materials directly into the molten steel. It is strictly forbidden to add large pieces of materials after the molten liquid is filled to the top. , to prevent capping.
- When repairing the furnace and pounding the crucible, it is strictly forbidden to mix iron filings and iron oxide, and the pounding of the crucible must be dense.
- The pouring site and the pit in front of the furnace should be free of obstacles and water to prevent the molten steel from falling to the ground and exploding.
- The molten steel is not allowed to be filled too full. When pouring the hand bag, the two people should cooperate in unison and walk smoothly. No sudden stops are allowed. After pouring, the remaining steel must be poured into the designated place. It is strictly forbidden to dump it randomly.
- The medium frequency generator room should be kept clean. Inflammable and explosive items and other debris are strictly prohibited from being brought into the room. Smoking is prohibited indoors. The altitude does not exceed 3000m; the ambient temperature is within the range of 3-40°C; (antifreeze measures are required in areas below 0°C); the monthly average maximum relative humidity in the use area is not greater than 90%; there is no conductive dust, explosive gas and Corrosive gases that can severely damage metals and insulation.
Application areas of Induction Furnace
- Welding: cutting tools, drilling tools, cutters, woodworking tools, turning tools, drill bits, brazing, reamers, milling cutters, drill bits, saw blades, frames in the glasses industry, welding of steel pipes and copper pipes, pick picks Welding, welding of similar and dissimilar metals, compressors, pressure gauges, relay contact points, composite welding of different materials for stainless steel pot bottoms, welding of transformer winding copper wires, storage (welding of gas filling nozzles, welding of stainless steel dishes, kitchen utensils) .
- Heat treatment: quenching and annealing of gears, machine tool guide rails, hardware tools, pneumatic tools, electric tools, hydraulic parts, ductile iron, automobile and motorcycle parts, internal parts and other mechanical metal parts (surface, inner hole, part, whole), stainless steel Pot products stretch.
- Diathermic forming: standard parts, fasteners, large workpieces, small hardware, straight handle twist drills, hot upsetting and hot rolling of overall, partial diathermy and twist drills, round steel with a diameter of less than 100mm, and metal materials Heating and annealing is used for drawing, shaping, embossing, bending, head banging, heating steel wire (iron wire) for nail making, stainless steel product annealing, stretching, swelling, thermal expansion, etc.
- Other heating fields: heating coating of aluminum-plastic pipes, steel-plastic pipes, cables, and wires, metal preheating overmolding, semiconductor single crystal growth, heat matching, bottle heat sealing, toothpaste skin heat sealing, powder coating, Metal implanted aluminum foil seals used in plastic, food, beverage, and pharmaceutical industries.