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Large-diameter high-strength heat-resistant magnesium alloy thick-wall cylindrical workpiece forming process

A forming process and technology of thick-walled tubes, which are applied in the deformation of magnesium alloys, forging deformation and ring rolling deformation of rare earth magnesium alloys, can solve the problems that the processing and forming of thick-walled cylindrical parts is difficult to achieve, and achieve large size and durability. Good thermal performance and reduced production cost

Active Publication Date: 2014-05-07
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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  • Large-diameter high-strength heat-resistant magnesium alloy thick-wall cylindrical workpiece forming process

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 large-diameter high-strength heat-resistant magnesium alloy thick-wall cylindrical workpiece forming process, which comprises the steps of smelting in a big furnace, semi-continuous casting, homogenizing annealing, variable-temperature multi-directional forging, mechanical hole drilling, ring rolling formation and aging treatment, wherein the variable-temperature multi-directional forging is performed on an oil press, an ingot blank is preserved for 6-10h at 500-530DEG C before forging, downwards pressing speed is kept to 200-400mm / min, upsetting pass rolling reduction is kept to 30-40 percent, drawing pass rolling reduction is kept to 5-10 percent, the ingot blank is preserved for 3-5h at 480-500DEG C before the ring rolling formation, the rolling deformation is kept to 60-80 percent and the thick-wall cylindrical workpiece with outer diameter of 700-1100mm, wall thickness of 50-100mm and height of 300-700mm can be rolled. The thick-wall cylindrical workpiece with high strength and high heat resistance rolled by adopting the process disclosed by the invention has the advantages that the height-direction and tangent tensile strength at 200DEG C is more than or equal to 330MPa and the elongation is more than or equal to 8 percent.

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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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