Vacuum skull Furnace working principle
Vacuum skull Furnace working principle Introduction
When the vacuum skull Furnace is smelted, the arc melting consumable electrode forms liquid metal and accumulates in the water-cooled copper crucible. In order to obtain a large number of molten metals as soon as possible, higher melting power should be used, but the input current size and the degree of overheating caused by the molten pool should not cause the melting of the solidified shell on the crucible wall as the principle. When the required amount of liquid metal is smelted with consumable electrode, the power supply is cut off and the liquid metal is injected into the mold by rapidly tilting crucible. In order to adjust the temperature of liquid metal, the required amount of metal is made into consumable electrode. A tungsten rod is welded at the back end as a non-consumable electrode.
In the process of vacuum arc remelting, the melting and solidification of metal are carried out simultaneously. As there is a large temperature gradient in the water-cooled copper crystallizer, the solidification under this condition will form well-developed columnar crystals. In vacuum furnace melting solidification shell, completely separated from the metal melting and casting, because the metal level without electrode anode bright spot, relatively uniform temperature field, combined with the molten pool agitation, make a crystal growing up front formation during solidification supercooling liquid metal, there appear complement of crystal nucleus, which can get fine grain, it is vacuum arc remelting furnace solidification shell is another advantage.
The vacuum skull Furnace can cast liquid metal into the rotary mold to obtain finer and denser casting, including pipe, ring and other rotary castings.
The vacuum shell furnace is used for casting heat-resistant alloy and corrosion-resistant alloy castings, which can improve yield, reduce cost and improve performance significantly.
Safety features of vacuum skull Furnace
The heat treatment of vacuum skull Furnace is a comprehensive technology combining vacuum technology and heat treatment, which means that all and part of heat treatment process are carried out under vacuum state. China divides vacuum into low, medium, high and ultra-high vacuum. At present, the operating vacuum of most vacuum heat treatment furnaces ranges from 1.33~1.33 x 10 times cubed Pa.
Vacuum heat treatment can realize almost all heat treatment processes, such as quenching, annealing, tempering, carburizing, nitrification, etc., as well as vacuum brazing, sintering and surface treatment, etc. The vacuum heat treatment furnace has high thermal efficiency, can achieve rapid temperature rise and temperature drop, can achieve no oxidation, no decarburization, no carburization, can remove phosphorus dust on the surface of workpiece, and has functions of degreasing and degassing, so as to achieve the effect of surface brightness and purification. Generally speaking, the workpiece processed is heated slowly in the furnace, the internal thermal temperature difference is small, and the thermal stress is small, so the deformation is small. High qualified rate of products. Can reduce the cost, has the degassing effect, thus enhances the working mechanical performance and the service life. Good working environment, safe operation, no pollution and pollution. The treated workpiece has no risk of hydrogen embrittlement. It can prevent the surface of titanium and refractory metal shell from hydrogen embrittlement. The vacuum heat treatment process has good stability and repeatability. This series of advantages, the development of vacuum heat treatment equipment and process is more and more attention and application.