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Extrusion shearing mould and forming method capable of achieving magnesium alloy grain refinement

A technology of grain refinement and magnesium alloy, which is applied in the field of extrusion shearing die and forming, can solve the problems of high extrusion force of equipment, die structure and strength, etc., and achieve simple forming method, simple structure, and improved mechanical strength. performance effect

Active Publication Date: 2018-05-01
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has high requirements for equipment extrusion force, mold structure and strength.

Method used

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  • Extrusion shearing mould and forming method capable of achieving magnesium alloy grain refinement
  • Extrusion shearing mould and forming method capable of achieving magnesium alloy grain refinement
  • Extrusion shearing mould and forming method capable of achieving magnesium alloy grain refinement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The material is Mg-6Zn-0.5Cu-0.6Zr alloy, and the extrusion ratio is set to 12. Firstly, the cylindrical billet with a radius of 17.4 mm is heated to 400° C. and kept for 10 hours for homogenization treatment. Then assemble the sleeve and the extruded shear insert together, and preheat to 400°C; preheat the compact to 200°C. Heat the homogenized billet to 400°C again, keep it warm for 2 hours, place it on the top of the extrusion shearing insert in the sleeve, put a briquetting block on the upper end of the billet for extrusion, and the extrusion speed is 2.5m / min, and the bar is air-cooled at the outer end of the hollow slot of the sleeve. Before extrusion, apply high-temperature lubricant MoS on the inner surface of the sleeve, the surface of the compact and the billet, and the inner and outer surfaces of the extrusion shear insert 2 . After the extrusion is finished, the sleeve is cushioned, and the ejector rod is placed above the pressing block to push out the p...

Embodiment 2

[0045] The material is Mg-4Zn-1Y-0.5Zr alloy, and the extrusion ratio is 40. First, the cylindrical billet with a radius of 94.5 mm is heated to 450° C. and kept for 15 hours for homogenization. Then assemble the sleeve and the extrusion shear insert together, and preheat to 450°C; preheat the compact to 250°C. Heat the homogenized billet to 450°C again, keep it warm for 2 hours, place it on the top of the extrusion shearing insert in the sleeve, put a briquetting block on the upper end of the billet for extrusion, and the extrusion speed is 1.5m / min, and the bar is air-cooled at the outer end of the hollow slot of the sleeve. Before extrusion, apply high-temperature lubricant MoS on the inner surface of the sleeve, the surface of the compact and the billet, and the inner and outer surfaces of the extrusion shear insert 2 . After the extrusion is finished, the sleeve is cushioned, and the ejector rod is placed above the pressing block to push out the pressing block, extrus...

Embodiment 3

[0048] The material is Mg-6Zn-0.5Zr alloy, and the extrusion ratio is 25. Firstly, the cylindrical billet with a radius of 49.5 mm is heated to 350° C. and kept for 20 hours for homogenization. Then assemble the sleeve and the extrusion shear insert together, and preheat to 350°C; preheat the compact to 220°C. Heat the homogenized billet to 350°C again, keep it warm for 2 hours, place it above the extrusion shearing insert in the sleeve, put a briquetting block on the upper end of the billet for extrusion, and the extrusion speed is 2m / min, and the bar is air-cooled at the outer end of the hollow slot of the sleeve. Before extrusion, apply high-temperature lubricant MoS on the inner surface of the sleeve, the surface of the compact and the billet, and the inner and outer surfaces of the extrusion shear insert 2 . After the extrusion is finished, the sleeve is cushioned, and the ejector rod is placed above the pressing block to push out the pressing block, extrusion shearin...

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Abstract

The invention belongs to the field of magnesium alloy deformation technologies and mould designing and manufacturing, and relates to an extrusion shearing mould and forming method capable of achievingmagnesium alloy grain refinement. The extrusion shearing mould comprises a pressing block, a sleeve and an extrusion shearing insert, and a half mould of the extrusion shearing insert comprises an extrusion cup, an extrusion section, a shearing section, a forming section and a discharging area. According to the extrusion shearing mould and forming method, the defects that the requirements of theprior art for equipment extrusion force, a mould structure and the strength are high, and the technology is complex are overcome, the extrusion shearing mould and forming method can effectively achieve magnesium alloy grain refinement, the extrusion shearing mould is simple in structure, the method is simple and convenient, operation is easy, and the effect is obvious.

Description

technical field [0001] The invention relates to an extrusion shear die and a forming method for realizing grain refinement of magnesium alloys, and belongs to the fields of magnesium alloy deformation technology and die design and manufacture. Background technique [0002] Magnesium alloy is known as a green material for the sustainable development of resources and environment in the 21st century, and has become the focus of attention of various countries. Due to the close-packed hexagonal crystal structure of magnesium alloys, the plastic deformation ability of magnesium alloys is poor. At present, more than 90% of magnesium alloys are obtained in the form of castings. The low strength of magnesium alloys obtained under conventional casting conditions limits the wide application of magnesium alloys to a large extent. Compared with cast magnesium alloys, the grains of wrought magnesium alloys are finer, and casting defects are reduced or even eliminated, so that the compreh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06
Inventor 王峰代帅王志刘正毛萍莉王威周乐
Owner SHENYANG POLYTECHNIC UNIV
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