Spiral reducing-continuous twisting extrusion die for magnesium alloy high-performance plate

An extrusion die, high-performance technology, applied in the direction of metal extrusion dies, etc., can solve the problem of plate blank thickness thinning, etc., achieve the effect of large shear stress, reduce the number of turns, and increase the torsion radius

Pending Publication Date: 2022-06-24
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of the existing high-pressure torsion forming technology and the defects of the plate forming process; the purpose of the present invention is to provide a spiral variable diameter-continuous torsion extrusion die for high-performance magnesium alloy plates to achieve high-pressure torsion The purpose of forming and sheet blank thickness reduction

Method used

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  • Spiral reducing-continuous twisting extrusion die for magnesium alloy high-performance plate
  • Spiral reducing-continuous twisting extrusion die for magnesium alloy high-performance plate
  • Spiral reducing-continuous twisting extrusion die for magnesium alloy high-performance plate

Examples

Experimental program
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Effect test

Embodiment 1

[0019] In this embodiment, an AZ31 magnesium alloy cuboid extruded billet is selected, and the original size specifications are: width a is 180 mm, thickness h is 80 mm, and length is 2000-3000 mm. The embodiment is to first heat the billet to 250 ° C, keep it for an appropriate time and make the temperature uniform, and heat the mold at the same time to make its temperature rise to the same temperature as the billet to be processed, and then twist the extrusion channel 5 in the screw of the mold and the feeding extrusion. Lubricant is applied to the cavity of the die 1 and the cavity of the exit extrusion die 4. Put the blank to be processed into the cavity 1 of the feeding extrusion die, open the extrusion device, and apply pressure at the rear end of the blank to feed 10-15 mm / s, so that the blank passes through the cavity 1 of the feeding extrusion die and enters the middle. The helical twist extrusion channel 5 performs twist extrusion, and finally the formed plate is obt...

Embodiment 2

[0022] In this embodiment, an AZ31 magnesium alloy rolled sheet is selected, and the size of the sheet is: width a180mm and thickness h36mm. Length 2000mm. First, 3 to 5 sheets are stacked together, heated to 250°C, and kept for an appropriate time to homogenize the temperature of the material. At the same time, the mold is also heated to 250°C, and then lubricant is applied to the cavity of the mold. Start the pressure device, and under the action of pressure, make the sheet pass through the feed extrusion die 1, the spiral twist extrusion channel 5 and the outlet extrusion die 4 in sequence at a speed of 12-15mm / s. Composite together, and finally obtain a composite board with a width of 135mm × 15mm. And after shear deformation along the cross-section direction, the microstructure and properties of the composite sheet are greatly improved.

[0023] The mechanical properties of the sheet after extrusion in this example are as follows: the tensile strength is: 365Mpa~378Mpa,...

Embodiment 3

[0025] like Figure 5 As shown, it is the modified rod-shaped material torsion forming die of the present invention. The cross section of the beginning section of the cavity of the feed extrusion die 1 and the end section of the exit extrusion die 4 is changed from a rectangle to a circle, so that the improved die cavity can complete the extrusion of the bar. In this embodiment, as-cast ZK60 bar blanks with a diameter of φ180mm × length of 1200mm are selected. First, the bar blanks are heated to 300°C for an appropriate time to make the temperature uniform. The billet temperature is the same. Then apply lubricant in the die cavity, put the blank to be processed into the cavity 1 of the feed extrusion die, and apply pressure at the rear end of the bar blank for 8-12mm / s constant velocity extrusion, so that the blank passes through the feed extrusion. The cavity of the die 1 enters the middle spiral extrusion channel 5 for torsional extrusion, and finally passes through the ca...

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Abstract

The invention discloses a spiral reducing-continuous twisting extrusion die for a magnesium alloy high-performance plate. Comprising a feeding extrusion die, an outlet extrusion die, a middle torsion extrusion die, an inner die and an outer sleeve. A spiral variable cross-section torsion extrusion channel is arranged in the middle of the die body, and a die cavity is reduced in a gradient mode in the thickness direction and the width direction. According to the spiral twisting extrusion die, continuous twisting deformation of a plate blank in the circumferential direction can be generated through the spiral-line-shaped twisting extrusion channel, rotation and shearing strain of the blank are generated under the action of shearing stress, shearing and breaking of crystal grains are achieved, and compared with a traditional extrusion die, the spiral twisting extrusion channel can greatly increase the twisting radius, and the yield is improved. Therefore, the shear stress of the blank in the extrusion deformation process is improved, the purposes of refining grains and preparing special textures are achieved, and the comprehensive mechanical property of the formed plate is improved.

Description

technical field [0001] The patent of the invention belongs to the field of metal material processing, and specifically relates to a spiral variable diameter-continuous torsion extrusion die for a magnesium alloy high-performance sheet. Background technique [0002] Magnesium alloy, as the lightest metal structural material in current engineering applications, has the advantages of high specific strength, high specific stiffness, good damping and shock absorption, good dimensional stability, convenient machining, and easy recycling. Engineered Metal Structural Materials". It is widely used in high-tech fields such as aerospace, national defense, automobile, electronic 3C and so on. However, due to the close-packed hexagonal crystal structure of magnesium and magnesium alloys, as well as the material properties of fast heat dissipation and narrow plastic deformation temperature range, the low-temperature plastic forming ability of magnesium alloys is poor, which hinders the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C25/02
CPCB21C25/02
Inventor 马立峰孙栋朱艳春邹景锋段华
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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