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Forming process of a large-diameter, high-strength, heat-resistant magnesium alloy thick-walled cylindrical part

A forming process and thick-walled cylinder technology are applied in the fields of magnesium alloy deformation, rare earth magnesium alloy forging deformation and ring rolling deformation. Large, good heat resistance effect

Active Publication Date: 2016-01-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These factors make it difficult to process thick-walled cylindrical parts with high strength and high heat resistance

Method used

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  • Forming process of a large-diameter, high-strength, heat-resistant magnesium alloy thick-walled cylindrical part

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Firstly, the raw material is smelted in a large furnace, semi-continuously cast, and a Mg-9Gd-4Y-0.6Zr (wt.%) magnesium alloy ingot with a diameter of Ф480mm and a length of 700mm is machined, and the ingot is homogenized and annealed. After holding the ingot at 530℃ for 8 hours, the ingot is subjected to upsetting multi-directional forging on a hydraulic press, with a reduction speed of 200-400mm / min, a reduction of 30-40% for the upsetting pass, and a reduction of 30-40% for the elongation pass. 5-10%, upper and lower chopping board temperature 200-250 ℃. During the forging process, when the surface temperature of the ingot is lower than 430°C, it is returned to the furnace for annealing, and the annealing process is held at 520°C for 4 hours. The annealing temperature of each return furnace is lowered by 10°C compared with the previous annealing. After 3 times of upsetting, the billet is flattened to a height of 450mm. The blank is mechanically perforat...

Embodiment 2

[0019] Example 2: Firstly, the molten raw material is smelted in a large furnace, semi-continuous casting, and a Mg-8Gd-3Y-0.6Zr (wt.%) alloy ingot with a diameter of Ф450mm and a length of 630mm is machined, and the ingot is homogenized and annealed. After the ingot is kept at 520°C for 10 hours, multi-directional forging is carried out on the hydraulic press, with a reduction speed of 200-400mm / min, a reduction of 30-40% for the upsetting pass, and a reduction of 5-10 for the elongation pass. %, Upper and lower cutting board temperature 200-250 ℃. During the forging process, when the surface temperature of the ingot is lower than 430°C, return to the furnace for annealing, the annealing temperature is 500°C, and the holding time is 5h. The annealing temperature of each refurbishment is lowered by 20°C relative to the previous annealing temperature. After 4 upsetting, the billet is flattened to a height of 500mm. The ingot is mechanically pierced at the central axis, and ...

Embodiment 3

[0020] Example 3: Firstly, the raw material is smelted in a large furnace, semi-continuous casting, and a Mg-8Gd-2Y-0.6Zr (wt.%) magnesium alloy ingot with a diameter of Ф450mm and a length of 550mm is machined, and the ingot is homogenized and annealed. After 520 ℃ heat preservation ingot billet for 8 hours, carry out upsetting and drawing multi-directional forging on the hydraulic press, the reduction speed is 200-400mm / min, the reduction of upsetting pass is 30-40%, and the reduction of drawing pass is 5-10 %, Upper and lower cutting board temperature 200-250 ℃. During the forging process, when the surface temperature of the ingot is lower than 430°C, return to the furnace for annealing, the annealing temperature is 500°C, and the holding time is 4h. The annealing temperature of each refurbishment is lowered by 20°C relative to the previous annealing temperature. After 3 times of upsetting, the billet is flattened to a height of 350mm. The blank is mechanically perforat...

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Abstract

The invention discloses a forming process of a large-diameter, high-strength, heat-resistant magnesium alloy thick-walled cylindrical part. The process route is: large furnace smelting, semi-continuous casting, homogenizing annealing, variable temperature multi-directional forging, mechanical piercing, ring rolling forming and aging treatment, among which variable temperature multi-directional forging is carried out on a hydraulic press, and the ingot is kept at 500-530°C before forging 6-10h, reduction speed 200-400mm / min, upsetting pass reduction 30-40%, elongation pass reduction 5-10%, 480-500℃ insulation ingot before ring rolling forming 3- 5h, the rolling deformation is 60-80%, and a thick-walled cylindrical piece with an outer diameter of Ф700-1100mm, a wall thickness of 50-100mm, and a height of 300-700mm is rolled. The invention prepares a thick-walled cylindrical part with high strength and high heat resistance, the tensile strength in the vertical direction and the tangential direction at 200°C is ≥330MPa, and the elongation is ≥8%.

Description

technical field [0001] The invention relates to the deformation field of magnesium alloys, in particular to the field of forging deformation and ring rolling deformation of a rare earth magnesium alloy. technical background [0002] As an important structural part in the aerospace field, thick-walled cylindrical parts have always been made of aluminum alloy. At present, material weight reduction has become an urgent need in the aerospace field. If these structural parts are made of magnesium alloy, the weight can be reduced by 1 / 3 compared with aluminum alloy. This has practical significance for improving the flying distance and flying speed of the aircraft and reducing fuel consumption. At the same time, the magnesium alloy has good effects of anti-electromagnetic interference, shock absorption and noise reduction, which is conducive to improving the stability and accuracy of the aircraft. However, it is more difficult to prepare thick-walled cylindrical parts from magnes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00B21H1/06C22C23/00
CPCB21H1/06B23P15/00C22C23/06C22F1/06
Inventor 刘楚明万迎春张绪虎石刚张帆陈志永顾洪兵刘东军
Owner CENT SOUTH UNIV
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