Vacuum induction furnace common sense
1.What is the reason for the vacuum in the vacuum induction furnace?
The furnace body leaks;
Insufficient pumping capacity of the vacuum pump;
The molten steel gas content is high and the gas discharge amount is large;
The equipment has water leakage and oil leakage.
2.What are the precautions for vacuuming large vacuum induction furnaces ?
The first are the burning of low melting point volatiles , which will cause damage to the equipment ; After turning the furnace , first add a small amount of charge to reduce the temperature of the crucible ; When vacuum is being smelt , it should be not that the surface of the molten steel is conjunct to prevent oxidation of the molten steel.induction heater.
3.How to deal with the slag ring?
After the slag ring is generated, the slag ring can be burned by increasing the loading amount and tilting forward and backward during the washing process;
For the slag ring that has been off-arc, it can be processed through the feeding basket;
For larger slag rings, because they are more firmly welded to the crucible, they can be vacuumed and cleaned directly by welding or welding.
4.What is the cause of the water shutoff in the vacuum induction furnace casting process ?
The initial water blocking port of the pouring is generally caused by the cleaning of the flow steel trough or the slag on the surface of the molten steel when the furnace is turned over , and the pouring speed is not kept up ;
The water blocking port in the middle and late pouring is mainly due to the flow interruption in pouring , and the slag on the surface of the molten steel in the flow steel tank accumulates in the nozzle , causing blockage ;
The pouring temperature is low .
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5.What are the reasons for drilling molten steel at the bottom of the ingot molds during pouring?
Pouring temperature is too high;
The bottom of the ingot mold is broken or the bottom mat is not plugged.
6.Why do you burn the mold during the casting process ?
Pouring temperature is too high ;
The mold or nozzle is not seated , the nozzle is simmered , and the molten steel is poured directly onto the mold wall during pouring .
7.Why is the ingot mold deformed and what is the effect of the deformed ingot mold on the casting ?
The deformation of the ingot mold is mainly caused by the ingot being stuck in the ingot mold , which cannot be smoothly taken out , and is often demoted by means of impact , so that the ingot molds after deformation and deformation of the ingot mold will bring difficulty to demanding the ingot .
8.What is the danger of breaking the vacuum on the crucible ?
After breaking the vacuum , the crucible is oxidized and the surface is easy to fall off ;
The residual molten steel absorbs oxygen seriously , and an oxide film is formed into the surface of the crucible of the smelting of the furnace , which brings difficulties to the smelting ;
After breaking the vacuum , the crucible is cool sharply and cracks are likely to occur .induction welder.
9.What are the reasons for the high composition of the vacuum induction furnace ?
There is a deviation from the chemical composition of raw materials ;
Weigh when feeding ;
The slag ring in the smelting process .
10.How to deal with the rise of molten steel in the vacuum induction furnace smelting ?
The molten steel rises to a high gas content of the molten steel , and the molten steel rises after the feeding , and the argon gas may be charged to increase the pressure in the melting chamber .
