1.
Principle
Vacuum
induction furnace is a melting equipment which is using intermediate frequency
to inductive heat. A spiral tube coil is inside chamber. When connected with
intermediate frequency current, there will be alternating magnetic field. Magnetic
induction line will be cut by metal specimen, then create circulating current.
Circulating
current will work on surface of metal specimen and make high current density on
surface of specimen, then creates concentrated and strong hot effect to heat
and melt metal specimen.
2.
Function
With ability to strictly
control alloy contents, electromagnetical stir and degass in high vacuum, it is
widely used in metallurgical production and material research department.
This furnace can be used in
melting and casting Nickel, Iron, Cobalt and other high level precision alloy
or high
purity metal under high
vacuum or atmosphere protection environment.
By using graphite crucible
or other kind of crucibles, it can indirectly melt low resistivity metal and
alloy, such as gold, silver, copper, aluminum, bronze.
3. Specification
4. StructureIt
is comprised with furnace body, furnace cover, alloy feeder, induction coil, coaxial
electrodel, vacuum system, crucible, ingot mold, vacuum measuring system,
water-cooling system, control system, etc
A. Furnace body:
double
shell structure, SS304 material, well polished surface, which are smoothy and
good to shorten vacuuming time, and easy to clean.
Reserved vacuum connection port, coaxial
electrodel and power connection port.
B. Furnace cover
: double
shell structure with water cooling function, SS304 material, well polished
surface, there are cooling water between two shell.
There are observe windows, alloy feeder, handle.
Observe windows are convenient to observe experiment process. Totally 4 pcs ,
if one of them polutted or broken, it’s easy to switch and replace.
C. Alloy feeder:Convenient to fill in all kinds of
material during melting process.
There are 5 parts of alloy
feeder with covers for sealing. Before vacuumizing, put required material in
feeder in advance. It can be used in vacuum situation, fill in material in
order. Convenient to operate.
D. Induction
coilL: enwinding by square copper,
surface is painted for insulation, and fixed on insulationg board. With nuts to
connect induction coil and coaxial electrodel, which is convenient to install,
it can realize well elecric conduction and reliable vacuum seal.
Crucible is place inside of
coil, there are glass wool cloth or asbestos board between coil and crucible,
it can protect coil, prevent short circuit because of leakge of specimen. At
the same time, prevent coil from thermal radiation of crucible.
There are refractory board in
bottom of coil, it’s used to support crucible.
The number of coil is not
stable, it differs according to different requirement.
E. Coaxial
electrodel: conductive device. It can
conduct electricity and make water flow. Through vacuum furnace body, convert
current and cooling water to induction coil.
Vacuum rubber sealed coaxial
electrodel in vacuum furnace body, rotate coil, crucible and specimen together.
Handwheel on out side can
make furnace to original position.
F. Crucible:
in order to prevent chemical reaction between
specimen and crucible, different specimen is with different crucible.
G. Vacuum
system: oil diffusion pump, mechanical pump to make sure
vacuum requirement
H. Vacuum
measurement:
Compound
vacuum meter show vacuum degree from 13-13×10-2Pa and 13×10-2Pa-13×10-6Pa.
Another pressure gauge range from 0.1MPa~133Pa
I. Gas
inlet device:used for take in required
gases, such as Ar, N2, Max. pressure:≤0.02Mpa.
J. Water
cooling system
Water
cooling system is connected with control system, when water pressure is lower,
audible and visual alarm will on and turn off heating power which assure safety
operation.
K. IGBT intermedia frequency power: high effeciency
and energy-saving.
L. Control
system:
PLC
control with famous brand meter, intuitive interface, easy to operate.
Power
supply: manual or automatical, all operations could make on touch screen, with
wrong operation alarm function.
Temperature
control system: full automatic PLC and touch screen control. Experiment data
and result will be saved automatically, and create history curve. PLC
controller, PID and over-heat alarm.
Control
system software: Easy to operate and real-time monitor inside experiment inside
chamber.