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Rolling method of sheet metal

A technology for metal sheets and plates, applied in metal rolling and other directions, can solve the problems of many processes and low production efficiency, and achieve the effects of reducing production costs, improving rolling efficiency, and reducing edge cracks.

Active Publication Date: 2011-04-06
深圳市怡康乐科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the current rolling process of magnesium alloys mostly adopts the method of small reduction, multiple passes, and intermediate annealing, which requires many processes and the production efficiency is not high.

Method used

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  • Rolling method of sheet metal
  • Rolling method of sheet metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] First, a magnesium alloy plate is pretreated, that is, at 400°C along the transverse direction of the plate ( figure 1 A direction is the rolling direction, B direction is the transverse direction, and C direction is the normal direction) to apply compressive stress, the compressive stress is greater than the yield stress of the plate in the transverse direction, so the plate will produce plastic strain, when the strain reaches 20% , stop the pretreatment, and then send the plate into the roll rolling, the temperature of the roll is normal temperature, the reduction is 63%, and the obtained magnesium alloy plate does not have defects such as edge cracks.

[0018] In Example 1, the (0002) base plane is perpendicular to the transverse direction and parallel to the normal direction by applying compressive stress along the transverse direction of the plate, effectively reducing the texture of the base plane (that is, the plane perpendicular to the normal direction) Therefor...

Embodiment 1

[0023] Apply a compressive stress to the same magnesium alloy plate as in Example 1 at 400°C along the normal direction of the plate, the compressive stress is greater than the yield stress of the plate in the normal direction, so the plate will produce plastic strain, when the strain reaches 20% , stop applying the compressive stress, then the plate is sent into the rolls for rolling, the roll temperature is normal temperature, the reduction is 63%, and the obtained magnesium alloy plate has a small amount of edge cracking.

Embodiment 2

[0025] A magnesium alloy plate identical to that of Example 1 was directly sent into rolls for rolling, and the roll temperature was normal temperature and the reduction was 63%, and the obtained magnesium alloy plate was severely cracked.

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Abstract

The invention relates to a rolling method of the sheet metal and the method comprises the steps of pretreatment and rolling. In the pretreatment step, a transverse compression stress or normal tensile stress is applied on the sheet material before the rolling step to ensure the sheet material to generate plastic strain. In the method of invention, the sheet material is pretreated before rolled, namely the special stress is applied on the sheet material to change the texture orientation of the sheet material, thus weakening or eliminating basal texture and increasing the rolling formability ofthe sheet material to a great extent, namely cracks can not appear under a large reduction. Therefore, the edge cracks of the sheet material which are generated in the rolling process can be reduced,the rolling efficiency can be increased and the production cost can be reduced; and the rolling method is suitable for the rolling of the metals with dense-hexagonal crystal structure such as magnesium alloy, the rolling reduction of magnesium alloy per pass is more than 60%, and the edge cracks can not be generated.

Description

technical field [0001] The invention relates to a metal processing method, in particular to a metal plate rolling method. Background technique [0002] As the lightest structural alloy, magnesium alloy has been gradually applied in aerospace, automobile, motorcycle, electronic products and other fields, and the requirements for its mechanical properties are getting higher and higher. Traditional cast magnesium alloys have gradually been unable to meet the requirements. Deformed magnesium alloy products produced by extrusion, rolling, forging and other plastic processing processes have attracted more and more attention due to their better mechanical properties and diversified structures. Among them, rolling has attracted much attention because it is easier to mass produce large sections. [0003] However, since magnesium has a close-packed hexagonal structure, there are only 3 slip systems at room temperature, which does not satisfy the coordination principle of polycrystall...

Claims

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Application Information

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IPC IPC(8): B21B1/22
Inventor 张丁非戴庆伟兰伟刘渝萍方霖徐杏杏
Owner 深圳市怡康乐科技有限公司
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