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What is induction furnace?
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What Is Induction Furnace?
Induction furnace is a kind of power supply device that converts the
power frequency of 50 Hz AC into intermediate frequency (300 Hz to
1000 Hz). It converts the three-phase power frequency AC into direct
current after rectification, and then converts the direct current into
adjustable intermediate frequency current to supply the intermediate
frequency alternating current flowing through the capacitor and
induction coil. It generates high-density magnetic lines in the induction
coil and cuts the metal materials contained in the induction coil, and a
large eddy current is produced in the metal material.
This kind of eddy current also has some properties of intermediate
frequency current, that is, the free electrons of metal flow in the metal
body with resistance to generate heat. A three-phase bridge fully
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controlled rectifier circuit is used to convert alternating current into
direct current. For example, a metal cylinder is placed in an induction coil
with alternating medium frequency current. The metal cylinder does not
directly contact with the induction coil. The temperature of the coil itself
is very low, but the surface of the cylinder is heated to redness or even
melting, And the speed of reddening and melting can be achieved by
adjusting the frequency and the current. If the cylinder is placed in the
center of the coil, the temperature around the cylinder is the same, and
the heating and melting of the cylinder do not produce harmful gas and
strong light pollution.
Induction furnace is widely used for smelting of non-ferrous metals,
mainly used for smelting ferrous materials such as steel, alloy steel,
special steel, cast iron, stainless steel, zinc and other non-ferrous
materials. Induction melting furnace can also be used for smelting,
heating and heat preservation of copper, aluminum and other
non-ferrous metals, and can be used for duplex operation with blast
furnace. Foundry melting furnace can also be used for forging heating,
for bar, round steel, square steel, steel plate diathermy, temperature
compensation, blue quenching blanking, on-line heating, local heating.
Induction furnaces can also be used for on-line forging of metal
materials, such as precision forging, extrusion, hot rolling, heating before
shearing, spraying heating, hot assembly of gear, half shaft connecting
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rod and bearing, as well as quenching and tempering, annealing and
tempering of metal materials. Induction melting furnace is also used in
heat treatment and tempering production line, mainly for surface heat
treatment of shaft (straight shaft, variable diameter shaft, camshaft,
crankshaft, gear shaft, etc.), gear, sleeve, ring, plate, machine screw,
guide rail, plane, ball head, hardware tools and other mechanical parts,
as well as quenching and tempering, annealing and tempering of metal
materials.
Characteristics of Induction Melting Furnace
1. High heating speed, high production efficiency, less oxidation and
decarbonization, material and cost saving, and prolonging die life
Because the principle of medium frequency induction heating is
electromagnetic induction, its heat is generated in the workpiece itself.
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Ordinary workers can carry out continuous forging work ten minutes
after working with intermediate frequency electric induction furnace,
without the need for professional workers to conduct furnace burning
and sealing in advance. Because of the fast heating speed of this heating
method, there is little oxidation. The oxidation burning loss of medium
frequency heating forging is only 0.5%, the oxidation burn loss of gas
furnace heating is 2%, the coal-fired furnace reaches 3%. The medium
frequency heating process saves materials. Compared with the coal
burning furnace, the raw material of steel is saved at least 20-50 kg
compared with the coal burning furnace. The utilization rate of the
material can reach 95%. Because the heating method is even and the
temperature difference between the core and the surface is very small,
the forging die life is greatly increased in forging. The surface roughness
of forgings is also less than 50um process, and the medium frequency
heating oil can save 31.5% to 54.3% of the energy saving, which is 5% -
40% more energy saving than gas heating. The heating quality is good,
the waste rate can be reduced by 1.5%, the productivity is increased by
10% - 30%, and the life of the die can be prolonged by 10% - 15%.
2. Superior working environment, improving workers' working
environment and corporate image, no pollution and low energy
consumption
Compared with coal furnace, induction melting furnace will not be baked
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and smoked in hot sun, and can meet the requirements of environmental
protection department, and establish the external image of the company
and the development trend of forging industry in the future. Induction
heating is the most energy-saving heating method in electric induction
furnace, which is heated from room temperature to 1100 ℃ and the
energy consumption of tons of forgings is less than 360 degrees.
3. Uniform heating, minimal temperature difference between core
and meter, high temperature control accuracy
The heat of induction heating is generated in the workpiece itself, so the
heating is even, and the temperature difference between the core
surface is very small. The application of temperature control system can
realize the accurate control of temperature to improve the quality and
qualification rate of products.
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Characteristics of induction furnace
1. Smelting speed is fast, power saving effect is good, burning loss is less
and energy consumption is low.
2. The self mixing function, melting temperature and metal composition
are uniform.
3. The electric heating operation environment is good.
4. Good start-up performance, and the empty furnace and full furnace
can be started up to 100%
Other Characteristics
The heating device of induction melting furnace has the advantages of
small volume, light weight, high efficiency, excellent heat processing
quality and favorable environment, etc. Induction furnace is rapidly
eliminating coal fired furnace, gas furnace, fuel furnace and common
resistance furnace, which is a new generation of metal heating
equipment.
Induction furnace is the main equipment of casting forging and heat
treatment workshop. Its stability, reliability and safety are the guarantee
of the normal and stable operation of casting forging and heat treatment
production line in the flow water operation. Foundry melting furnace has
a good prospect in the field of heat processing, such as the main
production of pre forging heating furnace, heat furnace and induction
heating for heat transmission, rolling, forging, elbow, heat treatment
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(quenching), welding and other processes.
Characteristics of induction furnace production line
The mechanical transmission device of medium frequency production
line equipment adopts single station mode, and intermediate frequency
quenching, intermediate frequency tempering and annealing are
conducted according to the working procedure. The replacement of
sensors adopts the whole hoisting, rapid positioning and quick
connection of hydropower (a set of sensors can be replaced in a short
time). Induction furnaces can adjust the axis position of sensor
conveniently to meet the heating requirements of various blank
specifications. According to the needs of each product, the production
equipment is made up of eleven parts: the feeding and storing bracket,
the feeding and conveying device, the workpiece rotary roller
transmission device, the intermediate frequency quenching heating
module, the intermediate frequency quenching heat insulation module,
the intermediate frequency tempering module, the intermediate
frequency annealing module, the quenching spray device, the hydraulic
station, the central console and the automatic control system.
If you are looking for induction furnace, please mail at
marketing2@hanrm.com for your customized solution.
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