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Method for preparing wide magnesium alloy sheet

A magnesium alloy and sheet technology, applied in metal rolling, metal rolling, metal processing equipment and other directions, can solve the problems of high cost of magnesium alloy wide sheet, limited application of magnesium alloy sheet, poor plastic deformation ability, etc. Ease of implantation and handling, reduced sheet cost, reduced surface cracking effect

Active Publication Date: 2015-05-13
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The magnesium alloy sheet prepared by the conventional rolling process has a strong basal texture and poor plastic deformation ability. In this way, the magnesium alloy sheet produced by the conventional method is easy to produce small pass reduction and many rolling passes during the rolling forming process. Edge cracks and surface cracks are prone to occur, and the yield rate is greatly reduced. Therefore, the cost of preparing magnesium alloy wide sheets is high, which greatly limits the application of magnesium alloy sheets.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] According to the GB / T5153-2003 standard, calculate the weight of Mg, Al, Zn and Mn required for smelting 1000Kg AZ31B magnesium alloy; put the weighed material into a 150°C drying oven for preheating, and then put the preheated Mg is melted in a crucible heated to 700°C. When the magnesium is completely melted, the temperature is raised to 720°C. Add Al and Zn and stir while adding. After all the added metal elements are melted, raise the temperature to 740°C and add Mn (as MnCl 2 The form of adding), is also stirring while adding; when the melt temperature is 740 ° C, refining, degassing and slag removal are carried out; then the melt temperature is controlled at 710 ° C for heat preservation and standing, and after standing for 60 minutes, low-frequency Oily electromagnetic casting, electromagnetic casting frequency 20Hz, magnetic field strength 22mT, casting speed 37mm / min, cooling water 350L / min, crystallizer cross-section 350mm×850mm; then the ingot is subjected to...

Embodiment 2

[0023] The AZ31B magnesium alloy plate with a thickness of 14 mm and a width of 760 mm rolled out in Example 1 is used to carry out sheet rolling, and after the hot-rolled sheet is cut and trimmed before the sheet rolling, the surface is polished and processed; The hot-rolled sheet is finished-rolled after heating and annealing. The finishing-rolling temperature is 400°C, the roll temperature is 150°C, and the rolling speed is 200m / min. First, the processed hot-rolled plate is rolled in the first and second passes. The rolling process is: the deformation of each pass is 14mm→7mm→3.5mm. After the first finish rolling, the plate is stored in the front and rear of the finish rolling mill with a In the coiling device of the hot coil box, the temperature inside the hot coil box is 380°C; then the 3rd and 4th passes of rolling are carried out, the rolling process is 3.5mm→2.5mm→2mm, before the 3rd and 4th passes of rolling A 21-roller leveler is used for repeated bending deformation...

Embodiment 3

[0025] The AZ31B ingot homogenized in Example 1 with a thickness of 300 mm x a width of 800 mm x a length of 1500 mm was used for rolling along the width direction. Firstly, heat the prepared billet at 450°C and keep it warm for 5 hours; then hot-roll the prepared billet widthwise on a reversible plate hot rolling mill for one pass. The rolling process is as follows: The deformation is 300mm→255mm, and the rolling speed is 40m / min; then the 2nd, 3rd, 4th, 5th pass of reversible hot rolling is carried out. The rolling process is: the pass deformation is 255mm→204mm→166mm→132mm→100mm, The rolling speed is 60m / min, the vertical roll rolling with a deformation of 6% is carried out before the second pass, and the vertical roll rolling with a deformation of 5% is carried out before the fourth pass, and then the different speed ratio is 1:1.30 asynchronous hot rolling, in the 5th pass, rolling to 5% pre-stretching deformation; then put the plate into a 450℃ furnace for 40min high-tempe...

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Abstract

The invention relates to a method for preparing a wide magnesium alloy sheet. According to the method, a fine-grain and homogeneous magnesium alloy slab with low internal stress is homogenized and then reversibly hot-rolled at a high speed, the sheet is hugely pressed down and deformed by combining multiple pony-roughing pass high-temperature pre-annealing with vertical roller rolling and pre-stretching in the reversible high-speed hot-rolling process, and a magnesium alloy medium-thickness sheet can be obtained after multi-pass hot-rolling. After ends of the medium-thickness sheet are cropped and the edge of the medium-thickness sheet is sheared, the surface of the medium-thickness sheet is grinded and polished, the medium-thickness sheet is precisely rolled after heating and annealing, and the sheet is hugely pressed down and deformed by combining multiple pony-roughing pass high-temperature pre-annealing with repeated bending deformation and high-speed asymmetrical rolling in the precision rolling process, so that the high-precision magnesium alloy sheet is obtained. The method is simple in process, easy to operate and suitable for large-scale industrial production, sheet cracking rate is greatly reduced, and the yield of the magnesium alloy sheet is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to a high-efficiency preparation method for wide-width magnesium alloy plates. Background technique [0002] Magnesium alloy is currently the lightest metal structure metal material with a density of about 1.8g / cm 3 , is one quarter of steel and two thirds of aluminum; compared with steel and aluminum alloys, magnesium alloys not only have higher specific strength and specific stiffness, but also have excellent heat dissipation performance, electromagnetic shielding performance, shock absorption Noise reduction performance and machining performance, and its products are easy to recycle, and it is expected to become an important lightweight structural material in the 21st century. Magnesium alloys have also become important materials in industrial fields such as printing, automobiles, national defense, aerospace, and 3C products. [0003] Plates are th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B3/00B21B37/00B22D11/00C22F1/06C21D8/02
Inventor 张志强宝磊乐启炽丁云鹏刘轩崔建忠
Owner NORTHEASTERN UNIV LIAONING
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