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Compound extrusion preparation method of large-diameter high-quality tube blank or annular blank

A compound extrusion, large-diameter technology, used in the preparation and processing of tube blanks, the compound extrusion preparation of large-diameter and high-quality tube blanks or ring blanks, and the field of difficult-to-deform materials, which can solve the problem of coarse structure, poor structure uniformity, and forming force It can achieve the effect of uniform structure, small deformation resistance and small strain rate.

Active Publication Date: 2013-06-26
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the deficiencies in the above-mentioned prior art, and provides a method for preparing a large-diameter and high-quality pipe (ring) billet. The preparation process can accurately control the deformation temperature, high yield, labor-saving forming, energy saving, and high material utilization rate. It can solve many problems such as poor structure uniformity, coarse structure and large forming force in the large-diameter tube (ring) billet prepared by the traditional process.

Method used

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  • Compound extrusion preparation method of large-diameter high-quality tube blank or annular blank

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preparation example Construction

[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 Φ300mm; after the surface of the electrode rod is polished and the riser is removed, an ingot with a diameter of Φ400mm 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 Φ300mm 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 Φ240mm was smelted in a vacuum induction furnace; after the surface of the electrode rod was polished and the riser was removed, the vacuum consumable electric arc furnace was used for secondary melting, and the diameter of the ingot was Φ320mm. 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 blank with an outer diameter of Φ260mm and an inner diameter of 120mm. Prefabricate the hollow billet with a normal carbon steel ladle ...

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Abstract

The invention relates to a compound extrusion preparation method of a large-diameter high-quality tube blank or an annular blank. The compound extrusion preparation method is mainly aimed at materials which are large in deformation resistance, narrow in heat processing temperature range, difficult in heat processing, and difficult to deform. The compound extrusion preparation method comprises the following steps: (1) a high-quality ingot blank with high purity is prepared through a vacuum melting process; (2) homogenization treatment is carried out alternatively, multi-pass pier drawing fast forging cogging-down is carried out, an organization is refined, and the homogeneity of the organization is improved; (3) hollow blank material is prefabricated in a punch mode; (4) isothermality / heat molding compound extrusion is carried out on the prefabricated hollow blank material, the tube blank with the uniform and thin organization is prepared; and (5) subsequent machining is carried out, and a finished tube (ring) and the high-quality ingot blank are obtained. The novel preparation method is used for preparing the large-diameter tube (ring) blank with the uniform and thin organization. The preparation method is labor-saving in shaping, energy-saving, high in material utilization rate, high in product quality, and capable of resolving the problems that a tube (ring) blank prepared through a traditional process is thick in organization, poor in uniformity, large in shaping force and the like.

Description

technical field [0001] The invention relates to a preparation and processing method of a pipe (ring) billet, in particular to a method for preparing a composite extrusion of a large-diameter and high-quality pipe billet or ring billet, which belongs to the technical field of metal processing and is mainly aimed at narrow thermal processing temperature range and deformation Hard-to-deform materials such as nickel-based alloys, high-strength steels, titanium alloys, and zirconium alloys with high resistance and difficult thermal processing. Background technique [0002] Difficult-to-deform materials such as nickel-based alloys, high-strength steels, titanium alloys, zirconium alloys, and tungsten alloys have excellent performance, and have excellent and unique performance. Therefore, they are widely used in many military technical fields such as aviation, aerospace, weapons, ships, and nuclear industries. Extensive, is the material basis of modern weapons and equipment. Howev...

Claims

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Application Information

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IPC IPC(8): B23P15/00B21C23/02B21J5/00C21C7/10C22C33/04B22D23/10
Inventor 郭胜利
Owner GRIMAT ENG INST CO LTD
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