Machining process capable of improving punching performance of magnesium alloy plate and belt

A technology of magnesium alloy plate and processing method, which is applied in metal processing and other directions, can solve problems such as poor stamping performance and unfavorable grain orientation, and achieve the effects of high processing efficiency, simple equipment, and reduced yield strength and yield ratio

Inactive Publication Date: 2005-09-28
CHONGQING UNIV
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  • Abstract
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Problems solved by technology

[0003] In order to solve the problem of poor stamping performance caused by the unfavorable grain orientation of the existing magnesium alloy plate and strip, the present invention proposes a processing method for improving the stamping performance of the magnesium alloy plate and strip, using unidirectional multi-pass bending technology to control the magnesium alloy Cold-rolled sheet texture for the purpose of improving the stamping properties of magnesium alloy sheet and strip

Method used

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  • Machining process capable of improving punching performance of magnesium alloy plate and belt
  • Machining process capable of improving punching performance of magnesium alloy plate and belt
  • Machining process capable of improving punching performance of magnesium alloy plate and belt

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Experimental program
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Effect test

Embodiment 1

[0018] combined with figure 1 Explain that a magnesium alloy plate 6 with a thickness of 1.0mm is placed on the fixed bracket 5, the front end of the plate is connected with the flexible belt 8 by the clamp 7, the rear end of the plate is connected with the flexible belt 3 by the clamp 4, and the other end of the flexible belt 8 Fixed on the surface of the reel 10. Driven by the motor, the reel 10 moves at a speed of 10m / min. By adjusting the pressure between the pinch roller 1 and the two rollers, the tension on the magnesium alloy plate is controlled to be 30 MPa. After the magnesium alloy plate 6 is bent for one pass, the motor drives the pinch roller 1 to reverse, and the reel 10 also reverses at the same time, so as to ensure that the magnesium alloy plate 6 is not under tension during the movement. Repeat the above steps, the number of bending passes is 5. Then it is straightened on a roller leveler, and finally it is fully softened and annealed at 260°C for 60 minute...

Embodiment 2

[0020] see image 3 , the coiled magnesium alloy strip 13 with a thickness of 0.6mm is placed on the uncoiler 12, the front end of the strip crosses the top of the fixed bracket 5 and is connected to the coiler 14, and the coiler is driven by the motor to drive the magnesium alloy strip The strip moves at a speed of 20m / min, and the tension on the magnesium alloy strip 13 is adjusted to 40MPa through the uncoiler 12 and the coiler 14 . After one pass is finished, the coiled material is taken off from the coiler 14, loaded on the uncoiler 12 and repeats the above steps. After 10 bending passes, stress relief annealing was carried out at 135°C for 120min. The arc radius of the contact part between the fixing bracket 5 and the magnesium alloy strip 14 is 1.0mm, and the bending angle of the magnesium alloy strip 13 is 90° when bending, and lubricated by cold rolling lubricating oil. After bending, the yield strength decreased from 172MPa to 120MPa, the yield strength ratio decre...

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Abstract

The processing method of improving punching performance of magnesium alloy plate and belt is to bent the magnesium alloy plate or belt fixed on the arced top of fixture by 45-135 deg with tension of 10-60 MPa applied to one end for 5-20 times, and then to straighten and anneal the bent magnesium alloy plate or belt. The said bending process makes the tensile stress of the crystal grains in the bent deformation part in certain angle to the basal plane, makes the basal plane rotate in the tensile stress direction to form some angle to the surface of the plate or belt, reduces base plane texture, obtains ideal texture component and improves the performance of the plate or belt. Therefore, the method of the present invention can lower the yield strength and yield ratio of the plate and the belt, raise the elongation and punching performance of the plate and the belt.

Description

technical field [0001] The invention belongs to the field of plastic processing of non-ferrous metals and relates to performance improvement of magnesium alloy plates and strips. Background technique [0002] Magnesium alloys with a hexagonal close-packed structure are commonly used. When the temperature is lower than 498K, the slip surface is mainly the basal plane {0001}, and the slip direction is <11 20>, that is, there is only one main slip surface and two independent slip systems. , the deformation is coordinated by conical {10 12}<10 11> twinning, grain boundary slip, etc. During the rolling deformation process, a strong basal texture will be formed in the magnesium alloy sheet. Especially during cold rolling and warm rolling deformation, the magnesium alloy has less slip system and forms a very strong basal texture, and its (0001) basal plane is parallel to the rolling surface. During the recrystallization annealing process of the plate, due to the direc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P25/00
Inventor 黄光胜黄光杰潘复生
Owner CHONGQING UNIV
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