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Preparation method of large-size titanium alloy hollow blank

A titanium alloy and hollow billet technology, which is applied in the field of large-scale titanium alloy hollow billet preparation, can solve problems such as difficulties and no mature and economical methods, and achieve the effects of overcoming low plasticity, significant economic benefits, and avoiding surface cracks

Active Publication Date: 2019-07-16
INNER MONGOLIA NORTH HEAVY INDS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] This method requires 9-13 times of fire before and after, and it is more difficult to prepare large-scale (above φ950mm) titanium alloy ingot hollow blanks than large-scale titanium alloy rods by using the traditional process, and there is no mature and economical method so far.

Method used

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  • Preparation method of large-size titanium alloy hollow blank
  • Preparation method of large-size titanium alloy hollow blank
  • Preparation method of large-size titanium alloy hollow blank

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preparation example Construction

[0028] The method for preparing a large-scale titanium alloy hollow billet specifically comprises the following steps:

[0029] Step 1: Coating the titanium alloy ingot 1 with a hard sheath to form an assembly. Coating heating anti-oxidation paint on the surface of the sheath;

[0030] Such as figure 1 As shown, it is a schematic diagram of the assembly of the ingot package in the present invention, that is, an assembly.

[0031] The package includes: package sleeve 2, upper spacer 3, lower spacer 4, connecting pin 5; 2 have a pin hole on the side wall of the bottom, and the lower pad 4 has a fixed counterbore on the side wall; the connecting pin 5 passes through the pin hole and is inserted in the fixed counterbore to prevent the lower pad 4 from coming off. The cladding sleeve 2 is made of stainless steel, the wall thickness is ≥15 mm, and the inner diameter is 5 mm larger than that of the titanium alloy ingot 1 . The upper pad 3 is made of low carbon steel, the diameter...

Embodiment 1

[0040] Material: TC4 titanium alloy

[0041] Hollow blank 6 specifications: φ1125mm×φ360mm×690mm

[0042] 1. Titanium alloy ingot preparation;

[0043] According to the requirements of GJB 220-94, the TC4 titanium alloy ingot is smelted, the riser is not removed after peeling, the diameter is 620mm, the height of the ingot is 1350mm, the ingot weight is 1.8 tons, and the temperature of the β transformation point is 995°C.

[0044] 2. Production of end caps and bags;

[0045] (1) Use 304 stainless steel cylinder, specification 720*15*1840mm, to make bag sleeve 2;

[0046] (2) Cut out the upper cushion block 3 and the lower cushion block 4 by using thick steel plate (forgings can also be used).

[0047] The thickness of the upper block is 200mm, and the diameter is D1. In order to improve the utilization rate of materials, excess process materials are added at the bottom, with a thickness of 310mm and a diameter of D1.

[0048] 3. The outer surface of the sheath is coated w...

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Abstract

The invention discloses a preparation method of a large-size titanium alloy hollow blank. A hard sleeve is used to sleeve a titanium alloy ingot, a heating anti-oxidation coating is applied on the surface of the sleeve, the sleeve is placed in a heating furnace for preheating and then is heated to 150-200 DEG C above the beta phase transition point of the titanium alloy ingot for heat preservation, the sleeve is subjected to closed upsetting a plurality of times on a large blank making press, and the deformed titanium alloy ingot is punched to obtain the titanium alloy hollow blank. The methodsolves that difficult problem of preparing large hollow blanks with a diameter phi greater than 950 mm, avoids the problems of surface cracks and wrinkles, and has uniform blank deformation.

Description

technical field [0001] The invention belongs to the field of thermal processing and manufacturing of nonferrous metals, and in particular relates to a method for preparing a large-scale titanium alloy hollow billet. Background technique [0002] The as-cast structure of titanium alloy ingot is coarse, and the small press machine processes the titanium alloy extrusion hollow billet. Generally, the ingot is forged into a bar with multiple fires, and then the inner hole is machined. For ingot titanium alloy ingots with a diameter ≥ φ600mm, the structure is coarser. In order to ensure that the as-cast structure is fully broken, its forgeability must be improved, especially to ensure that the core of the ingot has sufficient deformation. For this reason, large-scale titanium alloy bars generally need repeated upsetting, drawing, grinding and cleaning, which has problems such as low material utilization rate and long processing cycle. [0003] The invention patent with applicati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/08B21J1/06B21C23/22C22F1/18
CPCB21C23/22B21J1/06B21J5/002B21J5/08C22F1/008C22F1/183
Inventor 雷丙旺杨秀清黄艳丽杜红强刘正伟姚建清胡志林任祥
Owner INNER MONGOLIA NORTH HEAVY INDS GROUP
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