A compound extrusion preparation method of large-diameter and high-quality tube blank or ring blank
A compound extrusion and large diameter technology, which is applied in the field of compound extrusion preparation of large diameter and high quality tube blank or ring blank, hard to deform material, and tube blank preparation and processing, which can solve the problem of coarse structure, large forming force and uniform structure Poor performance and other problems, to achieve the effect of uniform organization, reduced extrusion force, and high product quality
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[0033] Such as figure 1 As shown, it is a process flow chart of the method for preparing large-diameter and high-quality tube billet or ring billet composite extrusion of the present invention. The composite extrusion preparation method of the present invention includes vacuum smelting, homogenization treatment, rapid forging billet opening, punching, and isothermal / Hot mold composite extrusion and machining, specifically include the following steps.
[0034](1) Vacuum smelting: vacuum smelting hard-to-deform materials such as nickel-based alloys, titanium alloys, high-strength steels or zirconium alloys to obtain alloy ingots; nickel-based alloys can be vacuum induction melting + electroslag remelting dual smelting process or Vacuum induction melting + electroslag remelting + vacuum consumable triple smelting process, high-strength steel can adopt vacuum induction melting + vacuum consumable dual smelting process, titanium alloy and zirconium alloy can adopt two or three vac...
Embodiment 1
[0041] According to the composition of In718 alloy, a vacuum induction furnace is used to smelt an electrode rod with a diameter of Ф300mm; after the surface of the electrode rod is polished and the riser is removed, an ingot with a diameter of Ф400mm is re-dissolved in an electroslag remelting furnace. The two-stage homogenization heat treatment process of In718 steel ingot is: 1160 ℃, heat preservation 24h and 1200 ℃, heat preservation 44h. Use ordinary carbon steel with a wall thickness of 10mm to wrap the homogenized In718 alloy ingot; put the wrapped ingot into the heating furnace, raise the temperature to 850°C, keep it for 2h, then raise the temperature to 1150°C, and keep it for 4h ;The billet is forged on the fast forging machine, and the forging is carried out for three fires, and the deformation of each fire is more than 70%, and it is rounded into a bar. A hollow blank with an outer diameter of Ф300mm and an inner diameter of 120mm. Preheat the prefabricated hollo...
Embodiment 2
[0043] According to the composition of the GH4698 alloy, the electrode rod with a diameter of Ф240mm was smelted by a vacuum induction furnace; after the surface of the electrode rod was polished and the riser was removed, the second melting was carried out by a vacuum consumable electric arc furnace, and the diameter of the ingot was Ф320mm. Homogenization treatment process of GH4698 steel ingot: 1160°C, heat preservation for 60h. The homogenized GH4698 alloy ingot is sheathed by ordinary carbon steel with a wall thickness of 10 mm. Put the sheathed ingot into the heating furnace, raise the temperature to 860°C, keep it for 2 hours, then raise the temperature to 1200°C, and keep it for 4 hours; It is more than 70%, and it is rounded into a bar. After the forging bar is blanked, it is punched, forged and machined. It is prefabricated into a hollow billet with an outer diameter of Ф260mm and an inner diameter of 120mm. Prefabricate the hollow billet with a normal carbon steel ...
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