Vacuum Induction Melting Furnace

Technical Specifications

Furnace Structure

●  Double layer water-cooling arched furnace cover. Equipped with two tension springs, used to balance the weight. You can open the cover easily. When it’s locking, two tension springs can also provide furnace cover airtight pressure to ensure good sealing.

●  Electrodes mounted on Sealed bearing, when needed tilting crucible, worker can operate the handle to pour the liquid steel.

●  When turning the feeder hand wheel every 60 degrees, there is one cubicle material fall into the tipping bucket inside the furnace cover.

●  Feeding tipping bucket is equipped with damping plate to prevent materials falls too quickly. When in use, gently shake the joystick (outside the furnace cover), you can control the speed and quantity of the material fall into the crucible

●  Active shutter is installed on the observation window, preventing glass from burning broken and getting dirty by steam accumulation of metal.

●  Shutter moves away shortly only when observing, controlled by the handle outside the furnace cover.

●  Pre-sintering moulding crucible can be placed inside.
You can also make the crucible according to the inductor inner wall. The material of crucible is up to the melting metal.

●  In front of the sensor, at the bottom of the furnace shell (where place the ingot mould), there is a circular pipe. On the pipe, there is a circular shelf to place ingot mould. Normally, ingot mould is placed on this shelf. When you need to cast the slender ingot, the ingot mould will be high, you can remove the shelf and put the ingot mould into the circular pipe, place it on the water-cooling cover. If you have some special needs, you can replace the water-cooling cover into a suitable water-cooling ingot mould room.

●  The medium frequency current of furnace was sent to inductor through the outside bus-tie and water-cooled medium frequency cable. Cooling water of medium frequency cable was directed by control valve on the furnace base.

●  The vacuum system has a 0-0.1Mpa pressure gauge, to check the rough vacuum and negative pressure of protective atmosphere.

Melting process

●  Some complex recycling materials must be cut off and removed surface scale, non-metallic materials, etc.

●  When feeding, you need to make sure the materials at the top of crucible is looser than the bottom. Use small piece of material to fill the gap. Place more regular shape material at the top to avoid scaffold bridging during the melting. In the direction of tapping hole can amass some granular materials.

●  Feeding movements should be light to avoid crucible damage and slags in the metallic liquid.

When the vacuum of 2-stage rotary pump is 15Pa and diffusion pump have been heated for about 50 minutes, now you can close 2-stage rotary pump valve, open diffusion pump valve, vacuum the furnace to the required high vacuum.

●  The max power of furnace is subject to the medium frequency voltage and max current.

●  It’s easy to cause sputtering when some alloy drop into the crucible. You need to pay attention to the speed of alloy’s adding. It can’t be too fast. Sometimes, you need to lower the power, make the liquid surface a bit harder, then adding the alloy to reduce sputtering.

Maintenance

●  When stop using the furnace for a while, you need to use compressed air to blow out the remained water to prevent corrosion and extent service life.

●  Pay attention to the heater of diffusion pump regularly. You can check if the heating wire is broken by measuring current.

●  When vacuuming steam-containing gas, you should open the gas ballast valve on the 2 stage rotary pump, or it will contaminate the oil in 2 stage rotary pump and lower the max vacuum.