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A large reduction rolling method of magnesium alloy

A large reduction, magnesium alloy technology, applied in the direction of metal rolling, metal rolling, manufacturing tools, etc., can solve the problems of sheet anisotropy, sheet processing and deformation disadvantage, to reduce the rolling temperature, solve the problem of rolling. The problem of cracked edge and rolling fracture, and the effect of increasing the single-pass reduction

Active Publication Date: 2016-02-03
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the traditional rolling method, due to its completely symmetrical upper and lower roll speeds, roll diameters and surface conditions, as well as a large shear strain between the rolls and the magnesium alloy during the deformation process, strong basal texture, which makes the anisotropy of the sheet serious, which is very unfavorable to the subsequent processing and deformation of the sheet

Method used

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  • A large reduction rolling method of magnesium alloy
  • A large reduction rolling method of magnesium alloy
  • A large reduction rolling method of magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Select a hard liner with a thickness of 2.5 mm and smooth upper and lower surfaces;

[0030] (2) Spread the high-temperature lubricant evenly on the surface of the liner and the magnesium alloy, and put the magnesium alloy blank and the liner into the heating box at the same time to heat;

[0031] (3) After the temperature rises to 350°C, let it stand for 5 minutes;

[0032] (4) Place the liner on the lower surface of the magnesium alloy blank, and push the liner and the blank to the roll inlet at the same time;

[0033] (5) Repeat steps (2)-(4), the upper and lower surfaces of the magnesium alloy billet are not turned over during the rolling process, and the rolling is completed in two passes, and the reduction in each pass is successively 60% and 50%;

[0034] (6) The average grain size of the rolled sample is 1.3 μm, the yield strength is 221 MPa, the tensile strength is 291 MPa, and the elongation at break is 15%.

Embodiment 2

[0036] (1) Select a hard liner with a thickness of 5-10 mm and smooth upper and lower surfaces;

[0037] (2) Spread the high-temperature lubricant evenly on the surface of the liner and the magnesium alloy, and put the magnesium alloy blank and the liner into the heating box at the same time to heat;

[0038] (3) After the temperature rises to 200-300°C, let it stand for 10-30 minutes;

[0039] (4) Place the liner on the lower surface of the magnesium alloy blank, and push the liner and the blank to the roll inlet at the same time;

[0040] (5) Steps (2)-(4) are repeated, and the magnesium alloy billet is turned upside down and sent to the roll between each adjacent pass, and the rolling is completed in four passes, and the reduction in each pass is 40%, 30%, 20% and 10%;

[0041] (6) Complete rolling.

Embodiment 3

[0043] (1) Select two hard liners with a thickness of 1 mm and smooth upper and lower surfaces;

[0044] (2) Spread the high-temperature lubricant evenly on the surface of the liner and the magnesium alloy, and put the magnesium alloy blank and the liner into the heating box at the same time to heat;

[0045] (3) After the temperature rises to 350°C, let it stand for 10 minutes;

[0046] (4) Place two liners on the upper and lower surfaces of the magnesium alloy billet respectively, and push the liner and the billet to the roll inlet at the same time;

[0047] (5) Rolling is completed in one pass, and the reduction is 90%;

[0048] (6) The yield strength of the rolled sample is 180MPa, the tensile strength is 270MPa, and the elongation at break is 22%.

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Abstract

The invention relates to a large reduction rolling method for magnesium alloy. According to the rolling method, a hard alloy lining plate is additionally arranged on the upper surface or the lower surface of the magnesium alloy, or two hard alloy lining plates are additionally arranged on the upper surface and the lower surface of the magnesium alloy at the same time, and the added hard alloy lining plates are rolled synchronously together with the magnesium alloy. The rolling method includes the steps that after a high temperature lubricating agent is evenly smeared on the surfaces of the lining plates and the surface of the magnesium alloy, the high temperature lubricating agent, the lining plates and the magnesium alloy are simultaneously placed into a heating box to be heated, after the temperature rises to a preset temperature, standing and thermal insulation are performed for a certain period of time, one hard alloy lining plate is placed on the upper surface or the lower surface of magnesium alloy blank, or the two hard alloy lining plates are placed on the upper surface and the lower surface of the magnesium alloy at the same time, and the hard alloy lining plates and the magnesium alloy are simultaneously fed into the position between rollers so that rolling can be completed. Through the method, the single pass reduction of the magnesium alloy can be greatly increased in the rolling process, the number of rolling passes is decreased, magnesium alloy crystalline grains are thinned, the texture is weakened, magnesium alloy plates with high strength and plasticity are prepared, and the large reduction rolling method for the magnesium alloy is also suitable for the large deformation rolling process of titanium, manganese and metal-matrix composite materials.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a rolling method of a high-performance magnesium alloy. Background technique [0002] As the lightest metal material for engineering structures, magnesium alloy has the advantages of high specific strength and specific stiffness, good electrical and thermal conductivity, good damping and shock absorption and electromagnetic shielding performance, and good regeneration and recycling. It is used in automobiles, communication equipment, Popular in aviation and other fields. Especially in terms of light weight, it has significant advantages that are difficult to replace. However, the commonly used magnesium alloys have poor plastic deformation ability and low tensile strength, which limit their application in many occasions. Rolling is one of the most important shaping processing methods for magnesium alloy sheets, especially magnesium alloy thin sheets. The pros and cons of its tech...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/38B21B47/00
Inventor 王慧远张磊夏楠南小龙张恩波刘纯国姜启川王金国刘国军
Owner JILIN UNIV
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