Method for forging and cogging magnesium alloy sheet

A technology for magnesium alloys and sheets, which is applied in the field of material forging and rolling, can solve the problems of uneven sheet structure, low pass down pressure, unfavorable rolling deformation, etc., so as to improve and reduce the tendency of slab edge cracking. Processing cost, effect of fine grain structure

Inactive Publication Date: 2012-06-27
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the unidirectional multi-pass high-temperature forging is easy to form a strong basal texture, which is extremely unfavorable for subsequent rolling deformation, resulting in low downforce in each pass, and high-temperature deformation is not conducive to shrinkage twinning to refine the grains, making the inside of the plate The structure is not uniform, and auxiliary multi-pass intermediate annealing is required, the process is complicated and the cost is increased

Method used

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  • Method for forging and cogging magnesium alloy sheet
  • Method for forging and cogging magnesium alloy sheet

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Experimental program
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Effect test

Embodiment 1

[0030] The initial size of the hot-rolled slab is 200×200×70mm, the thickness of which is 70mm, and the side is cross-forged in 3 passes at room temperature (in this example, it can be understood as 20°C), and the strain of each pass is 15%. The sides of the billet are alternately forged along the horizontal and vertical directions, and then heated to 400°C in the furnace for flat roll rolling, which can achieve a single pass of 40% down pressure and basically no cracks on the edge. After 7 passes of flat roll Pressed, the thickness can reach 5mm, and for the sample without side cross forging, the single-pass reduction is only 20%, and the thickness can reach 5mm after 13 rolling passes, and the edge cracks are obvious.

Embodiment 2

[0032] The initial size of the hot-rolled slab is 200×200×70mm, of which the thickness is 70mm. At 150°C, the sides are cross-forged 12 times, and the strain of each pass is 8%. , and then heated to 400°C in a hot furnace for flat roll rolling, which can achieve a single pass of 50% downdraft and basically no cracks on the edge. After 6 passes of rolling, the thickness can reach 6mm without side The single-pass reduction of the cross-forged sample is only 25%, and the thickness can reach 6mm after 12 passes of rolling, and the edge cracks are obvious.

Embodiment 3

[0034] The initial size of the hot-rolled slab is 200×200×70mm, of which the thickness is 70mm. Under the condition of 200°C, the sides are cross-forged 20 times, and the strain of each pass is 2%. Then keep warm in a hot furnace to 300°C and carry out flat roll rolling, which can achieve a single-pass reduction of 40% and basically no cracks on the edge, and can achieve large deformation continuous rolling deformation. After 8 passes of rolling The final thickness can reach 5mm, but for the sample without side cross forging, the single-pass reduction is only 15%, and the thickness can reach 5mm after 15 rolling passes, and the edge cracks are obvious.

[0035] The present invention adopts side cross forging treatment of magnesium alloy slab, so that the material has a large cold deformation at low temperature, and can effectively use the twinned grains to refine the grain size of the as-cast slab, making it After the treatment by the above method, a texture type that is benef...

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Abstract

The invention discloses a method for forging and cogging a magnesium alloy sheet, comprising the following steps: forging the side with a low temperature and a small stress in a cross way, namely, carrying out multi-process forging to the sheet from the side in a cross way along horizontal direction and vertical direction of the sheet, and forging with a relatively low process stress. By adopting the forging and cogging, the material undergoes large cold deformation at a low temperature, and twin refined crystal grains are effectively excited, so as to form a structure type that is helpful for consequent rolling shaping by refining the crystal grain size of the cast sheet and by effectively utilizing the twin divided crystal grains. Therefore, the single-process maximum pressing amount and continuous deforming property are greatly improved in the consequent rolling process, the rolling times and the intermediate annealing times are decreased, so that the processing cost of the magnesium alloy sheet is reduced. At the same time, the magnesium alloy sheet prepared by the method has more even and thinner crystal grain tissue and excellent mechanical property; the break tendency of the side of the sheet is greatly improved, so that the quality of the magnesium alloy sheet is improved.

Description

technical field [0001] The invention relates to the field of material forging processing and rolling forming, in particular to a method for forging blanking of cast magnesium alloy plates. Background technique [0002] Magnesium alloys are widely used in structural and processing components due to their light weight, high dimensional stability, anti-electromagnetic interference, excellent processing characteristics, excellent rigidity-to-weight ratio, good electrical conductivity, and recyclability. and a sharp rise in demand. Most 3C (computer, communication and consumer electronics) equipment, auto parts, hand tools, transportation and other industries are all markets where magnesium alloy technology can be applied. [0003] Magnesium alloy sheets are used to make thin-walled parts. Compared with plastics currently used as shell parts, magnesium alloy sheets have the advantages of high temperature resistance, low thermal expansion and easy recycling, and have important co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/00
Inventor 刘庆信运昌黄光杰辛仁龙王茂银周孝军
Owner CHONGQING UNIV
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