Material preparation technology of titanium casting

In vacuum or protective atmosphere, Aerospace titanium casting for smelting, casting castingprocess. The preparation process of titanium material. Titanium in molten state is very lively, has long been unable to find suitable and other material casting method, thecast titanium behind wrought titanium alloy 20 years. From 1956 to 1962 AmericanBaer (Beal), developed by vacuum consumable arc melting technology of the Titanium Castings Solidification, officially entered the industrial production. Based on thematerial performance is equal or close to the aviation titanium foundry, the cost is reduced by about 50%, and titanium casting technology has been rapid development.Expected in the near future, it will obtain the position and deformation of titanium alloyare equally important. Casting equipment and technology, vacuum consumable arc skull furnace is the main equipment for production of titanium castings, the principle is:in the furnace body, using Titanium casting cast or forged bar as the parent material electrode (anode), water-cooled copper crucible as a positive electrode, under vacuum atmosphere, low input voltage (25 ~ 40V) and high current the poles, close to the arc, melting titanium material consumable electrode tip, drop into the crucible, the formation of molten pool. Casting equipment and technology, vacuum consumable arc skull furnace is the main equipment for production of Aerospace investment castings, the principle is:in the furnace body, using titanium material cast or forged bar as the parent material electrode (anode), water-cooled copper crucible as a positive electrode, under vacuum atmosphere, low input voltage (25 ~ 40V) and high current the poles, close to the arc, melting titanium material consumable electrode tip, drop into the crucible, the formation of molten pool. In the cooling effect, a layer of shell forming copper cruciblewall and the crucible melt pool, protection against erosion,titanium foundry without pollution. When the weld pool growth crucible to sufficient amount, the blackout faultarc, promoting rapid electrode, flip the crucible, the molten titanium water injectionmold static or centrifugal rotation in. When the weld pool growth crucible to sufficient amount, the blackout fault arc, promoting rapid electrode, flip the crucible, the moltentitanium water injection mold static or centrifugal rotation in. Advantages of solidified shell furnace, high production efficiency, good control of alloy composition.Disadvantage is the metal superheat degree low, rapid casting and equipment largergating system. Casting quantity China maximum skull furnace is 500kg. America,former Soviet Union were about 1000kg. The other is in the stage of experimental study of titanium casting method with electron beam, plasma and cold wall crucibleinduction melting and casting method.