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Magnesium alloy plate grain refining controlled edge crack rolling method

A fine-grained, magnesium alloy technology, applied in the direction of metal rolling, contour control, etc., can solve the problems of ineffective control of edge cracks, improved plate yield, and ineffective grain refinement of magnesium alloy plates. Achieve the effect of taking into account cost and processing efficiency, increasing the overall yield of the plate, and achieving a remarkable effect of grain refinement

Active Publication Date: 2019-09-10
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

However, these rolling methods have the following outstanding problems in different degrees: ①The control effect of edge cracks is not obvious, and the yield of the plate is increased by less than 10%; ③ such as the lining plate rolling process, the damage to the rolling mill liner is relatively large, resulting in a substantial increase in production costs; ④ the effect of grain refinement on the interior of the magnesium alloy plate is not obvious, etc.

Method used

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  • Magnesium alloy plate grain refining controlled edge crack rolling method
  • Magnesium alloy plate grain refining controlled edge crack rolling method
  • Magnesium alloy plate grain refining controlled edge crack rolling method

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Embodiment Construction

[0020] The billet is AZ31 magnesium alloy ingot, the specifications are: thickness╳width╳length=50mm╳200mm╳200mm, product thickness 5mm, roll length 350mm.

[0021] According to the method of the present invention: first, the edge of the plate along the rolling direction is prefabricated by vertical rolling or forging, etc., and the rolling reduction of the next pass is set to 20mm, and the wide deformation width is 20mm, then the edge of the plate is prefabricated The reduction amount of the crown side can be obtained from formula (1) △h2 = 8.8 ~ 9.6mm, and then carry out asynchronous longitudinal rolling with a reduction amount of 20mm along the direction of the prefabricated crown, and select the speed ratio of the upper and lower rolls in the asynchronous rolling stage The range is between 1.01 and 1.05. At this time, the plate thickness is 30mm. After the completion, the rolled piece is rotated 90° clockwise. At this time, the length of the rolled piece is about 280mm, whi...

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Abstract

The invention particularly relates to a magnesium alloy plate grain refining controlled edge crack rolling method, and belongs to the technical field of metal material processing. The method aims to solve the problems that in existing magnesium alloy plate rolling, the yield is low caused by edge cracks; the production cost is greatly increased due to the fact that the damage of a rolling mill anda lining plate is large; and the grain refining effect in a plate is not obvious. The rolling method comprises the steps of prefabricating rolling direction edge convexity, asymmetrical cross rollingprefabricating a convexity plate, large-pressure lower continuous axial rolling, cross broad siding finish rolling and the like. The invention discloses a rolling method for effectively weakening cracks at the edge of a magnesium alloy plate and refining grains. The magnesium alloy plate grain refining controlled edge crack rolling method carries out composite optimization on broadside rolling, asymmetrical rolling, prefabricating convexity rolling and cross rolling methods which are applied to a magnesium alloy rolling forming process widely. The method provides technical support for improving the yield, refining grains and promoting magnesium alloy plate large-scale application, and has wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to a fine-grained and edge-crack-controlled rolling method for a magnesium alloy plate. Background technique [0002] Magnesium is rich in reserves in the earth's crust, which is in line with the development goal of light weight in modern industry. Metal alloying can improve its comprehensive performance. Magnesium alloy has both the light weight of magnesium and the performance improvement of alloying. The mechanical properties of magnesium alloy after large deformation processing can be improved It has been significantly improved, and rolling is an efficient and convenient large deformation method, but due to the special hexagonal close-packed metal structure of magnesium alloys, it is difficult to start the slip system, and due to the rapid heat dissipation of magnesium alloys, the edge metal temperature It is lower than the middle, so that the edge ...

Claims

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Application Information

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IPC IPC(8): B21B3/00B21B37/28
CPCB21B3/00B21B37/28
Inventor 黄志权杨国威来洪玉邹金超戚传路马立峰林金保
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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