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Magnesium alloy continuous variable-section large-deformation extrusion processing forming method

A technology of extrusion processing and molding method, applied in the direction of metal extrusion dies, etc., can solve the problems of uneven structure, small deformation, cracks, etc., and achieve the effect of excellent performance, fine grain size, and shortened process.

Inactive Publication Date: 2019-04-16
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional plastic deformation process has small deformation, limited grain refinement ability, and is prone to problems such as uneven structure and even cracks. Therefore, the use of large plastic deformation methods for magnesium alloys is the key direction of research
At present, the traditional extrusion process is mainly for bar products, and there is little research on the deformation method of magnesium alloy plate forming
And limited by extrusion temperature and extrusion ratio, the ability to refine grains is limited, and it is difficult to produce products that meet social needs

Method used

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  • Magnesium alloy continuous variable-section large-deformation extrusion processing forming method
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  • Magnesium alloy continuous variable-section large-deformation extrusion processing forming method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 Mg-1.5Zn-0.5Gd (wt.%)

[0023] 1. Assembling the mold; the mold is composed of a punch and a die; the punch is composed of a top plate and an extrusion rod 3, the extrusion rod 3 is fixedly mounted on the upper die frame 1, and the top plate is installed on the die, Pressed on the top of the blank 8; the die is composed of a die outer ring 9 and two detachable mold cores 10; The detachable mold core 10 can be assembled into a flat cylinder and installed in the outer ring 9 of the die; the middle of the assembled flat cylinder is the mold cavity 11;

[0024] The extrusion rod 3 is fixed under the upper mold frame 1 by bolts, the fixed plate 4 is fixed under the upper mold frame 1 by bolts, the spring 5 is fixed between the fixed plate 4 and the discharge plate 6 by bolts, and the detachable mold core 10 Installed in the outer ring 9 of the die, the outer ring 9 of the die is fixed on the lower mold base 12 through the flange, the upper mold base 1 and the lowe...

Embodiment 2

[0032] Example 2 Mg-4Zn-0.8Y-0.2Nd (wt.%)

[0033] In this embodiment, the magnesium alloy is heated to 300° C. in an external heating furnace; the magnesium alloy is extruded and deformed through the forming channel hole, and the extrusion speed is 3 m / min, and the extrusion ratio is 60, and constant-speed extrusion is performed. After extrusion, the magnesium alloy sheet is subjected to stress-relief annealing and kept at 250°C for 1 hour; then subjected to cryogenic treatment and held at liquid nitrogen temperature for 24 hours; then artificially aged at 200°C for 1 hour to further optimize performance.

[0034] The performance test results are as follows:

[0035]

Embodiment 3

[0036] Example 3 Mg-0.5Zn-0.3Ca-0.2Mn (wt.%)

[0037]In this embodiment, the magnesium alloy is heated to 300° C. in an external heating furnace; the magnesium alloy is extruded and deformed through the forming channel hole, the extrusion speed is 4 m / min, the extrusion ratio is 100, and constant-speed extrusion is performed. After extrusion molding, the magnesium alloy sheet is subjected to stress relief annealing and kept at 300°C for 1 hour; then subjected to cryogenic treatment and held at liquid nitrogen temperature for 24 hours; then artificially aged at 165°C for 1 hour to further optimize performance.

[0038] The performance test results are as follows:

[0039]

[0040] .

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Abstract

The invention discloses a magnesium alloy continuous variable-section large-deformation extrusion processing forming method, and belongs to the field of non-ferrous metal plastic forming. The method is mainly used for achieving extrusion forming of a magnesium alloy sheet-shaped casting material, and a traditional extrusion die is replaced with a continuous variable-section large-deformation extrusion processing die. Firstly, a multi-element and small-amount magnesium alloy is subjected to sub-rapid solidification casting forming; then, the magnesium alloy sheet-shaped casting material is placed in a detachable die core to be heated by an external heating furnace, and the heated die core is placed in a die frame, and then is closed; a blank is subjected to pressure from an extrusion rod and is subjected to upset-extruding deformation in an upset-extruding cavity of the upper part of the die core, and then the extrusion rod continues applying pressure to the blank so as to enable the blank to be subjected to extrusion deformation in an extruding cavity of the lower part of the die core; and then, the blank is subjected to multi-pass upsetting-extruding composite deformation to accumulate strain to generate dynamic recrystallization so as to refine crystal grains, so that the sheet magnesium alloy with optimized performance is prepared. Continuous extrusion forming of a sheet ofthe magnesium alloy sheet-shaped casting material is realized. According to the processing method, a magnesium alloy sheet-shaped part which is uniform in structure and optimized in performance can beobtained.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal plastic forming. Background technique [0002] Magnesium alloys have excellent properties, such as low density, high specific strength and specific stiffness, strong shock resistance, strong noise reduction capabilities, and superior processing performance. It can be widely used in aviation, aerospace, automobile, 3C and many other fields, and has received more and more attention in recent years. However, the existing usage conditions are far from the potential advantages of magnesium alloys. The crystal structure of magnesium alloy is a close-packed hexagonal structure, and its plastic formability at room temperature is poor, so it is greatly restricted in practical applications. At present, most of the magnesium alloy products are cast magnesium alloys. However, compared with cast magnesium alloys, wrought magnesium alloys have greater development potential, and can obtain higher strength, bet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/00B21C25/02B21C23/06
CPCB21C23/001B21C23/06B21C25/02
Inventor 李志刚江昊王慧远查敏王珵韩洪江赵泼贾红杰
Owner JILIN UNIV
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