Large-diameter moderately-strong heat-resisting magnesium alloy thick-wall barrel-shaped piece forming process

A forming process and thick-walled tube technology, which is applied in the deformation processing of magnesium alloys, forging and ring rolling deformation of Mg-Al-Ag series magnesium alloys, and can solve the problems of fast heat dissipation, narrow thermal deformation temperature range, and difficulty in blank preparation, etc. question

Active Publication Date: 2014-07-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Magnesium alloy has a close-packed hexagonal crystal structure, less slip system, and poor deformation ability at room temperature; the thermal deformation temperature range is narrow and heat dissipation is fast; the blank size required for large-diameter thick-walled cylindrical parts is large, and the blank preparation is difficult; there is currently no reference A report on the forming process of magnesium alloy thick-walled cylindrical parts

Method used

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  • Large-diameter moderately-strong heat-resisting magnesium alloy thick-wall barrel-shaped piece forming process
  • Large-diameter moderately-strong heat-resisting magnesium alloy thick-wall barrel-shaped piece forming process
  • Large-diameter moderately-strong heat-resisting magnesium alloy thick-wall barrel-shaped piece forming process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Mg-8.0Al-0.5Ag-0.4Zn-0.1Mn-0.1RE-0.01Ca (wt.%) magnesium alloy ingots with a diameter of Ф530mm were cast by semi-continuous casting using a large furnace to melt raw materials. The cast ingot is processed by mechanical turning, cutting, and chamfering in turn, and finally an ingot with a diameter of Ф480mm and a length of 700mm is processed, such as figure 1 shown. Carry out bipolar homogenization annealing on the ingot, the annealing process is 250-300°C for 10-12h, then heat up to 380-410°C for 20-30h, then air cool to room temperature. The ingot is heated to 410°C for 10 hours, and the ingot is subjected to upsetting and drawing multi-directional forging on a hydraulic press, with a reduction speed of 200-400mm / min, a reduction of 30-40% for upsetting passes, and a reduction of 30-40% for elongation passes. Amount of 5-10%, upper and lower cutting board temperature 150-200 ℃. During the forging process, when the surface temperature of the ingot is low...

Embodiment 2

[0024] Example 2: First, the alloy raw material is melted in a large furnace, and then a Mg-8.0Al-0.5Ag-0.4Zn-0.1Mn-0.1RE-0.02Ca (wt.%) alloy ingot with a diameter of Ф550mm is cast by semi-continuous casting. The cast ingot is processed by mechanical turning, cutting and chamfering in turn, and finally an ingot with a diameter of Ф500mm and a length of 780mm is processed. Carry out bipolar homogenization annealing on the ingot, the annealing process is 250-300°C for 10-12h, then heat up to 380-410°C for 20-30h, then air cool to room temperature. Heat the ingot at 400°C for 16 hours, perform upsetting multi-directional forging on the ingot on the hydraulic press, the reduction speed is 200-400mm / min, the reduction of the upsetting pass is 30-40%, and the reduction of the elongation pass is 5 -10%, upper and lower cutting board temperature 150-200 ℃. During the forging process, when the surface temperature of the ingot is lower than 350°C, return to the furnace for annealing...

Embodiment 3

[0025] Example 3: Firstly, a large furnace is used to melt the alloy raw material, and then a Mg-9.0Al-0.8Ag-0.4Zn-0.1Mn-0.1RE-0.01Ca (wt.%) magnesium alloy ingot with a diameter of Ф600mm is cast by semi-continuous casting. The cast ingot is subjected to mechanical turning, cutting, chamfering and other treatments in turn, and the final processed ingot size is Ф550mm in diameter and 650mm in length. Carry out bipolar homogenization annealing on the ingot, the annealing process is 250-300°C for 10-12h, then heat up to 380-410°C for 20-30h, then air cool to room temperature. Upsetting and drawing multi-directional forging is carried out on the ingot on the hydraulic press, the reduction speed is 200-400mm / min, the reduction of the upsetting pass is 30-40%, the reduction of the elongation pass is 5-10%, and the temperature of the upper and lower cutting boards 150-300°C. Heat the ingot to 410°C for 8 hours before forging. During the forging process, when the surface temperat...

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Abstract

The invention discloses a large-diameter moderately-strong heat-resisting magnesium alloy thick-wall barrel-shaped piece forming process. The process includes the steps of large-furnace smelting, semi-continuous casting, homogenizing annealing, varying-temperature multi-direction forging, mechanical punching, ring rolling forming and aging treatment. The varying-temperature multi-direction forging is conducted on an oil press, pressing speed is 200-400mm/min, upsetting reduction in pass is 30-40%, drawing down reduction in pass is 5-10%, blank before ring rolling forming is kept at the temperature of 380-400 DEG C for 4-8 hours, and rolling deformation is 60-80%. The thick-wall barrel-shaped piece 700-1100mm in outer diameter, 50-100mm in wall thickness and 300-700mm in height is manufactured. The thick-wall barrel-shaped piece is high in strength and good in heat resistance and meets size and performance requirements of structural parts in the aerospace field.

Description

technical field [0001] The invention relates to the field of magnesium alloy deformation processing, in particular to the field of forging and ring rolling deformation of a Mg-Al-Ag series magnesium alloy. Background technique [0002] At present, large-diameter thick-walled cylindrical parts, as important structural parts in the field of aerospace, are made of aluminum alloy. With the rapid development of the aerospace field, material weight reduction has become an urgent requirement in this field. If magnesium alloys are used to prepare these large-diameter thick-walled cylindrical parts, a significant weight reduction effect can be achieved (the density of magnesium alloys is one-third lighter than that of aluminum alloys). It is difficult to prepare thick-walled cylindrical parts from magnesium alloys. Magnesium alloy has a close-packed hexagonal crystal structure, less slip system, and poor deformation ability at room temperature; the thermal deformation temperature r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00C22C23/02C22F1/06
CPCB23P15/00C22C23/02C22F1/06
Inventor 刘楚明肖宏超张绪虎张帆顾洪兵刘东军沈光明
Owner CENT SOUTH UNIV
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