Differential-speed extrusion forming method of magnesium alloy high performance cup-shaped piece

A technology of extrusion forming and magnesium alloy, which is applied in the direction of metal extrusion dies, etc.

Active Publication Date: 2017-05-03
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

From this point of view, there are certain technical limitations in the patent "Mold and Method for Angular Extrusion Forming of Annular Channel of Magnesium Alloy Cup-Shaped Components"

Method used

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  • Differential-speed extrusion forming method of magnesium alloy high performance cup-shaped piece
  • Differential-speed extrusion forming method of magnesium alloy high performance cup-shaped piece
  • Differential-speed extrusion forming method of magnesium alloy high performance cup-shaped piece

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Experimental program
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Effect test

Embodiment

[0052] Take the preparation of an AZ31 magnesium alloy cup with an outer diameter of 200 mm and an inner diameter of 170 mm as a specific example.

[0053] The blank size used is H=360mm, diameter D 1 =80mm, "T" shape upper die 4 cavity diameter D 2 = 90mm, D 1 2 . The whole mold is preheated to 400°C for 2 hours, and the magnesium alloy billet is heated to the forming temperature of 350°C and held for 2 to 4 hours. The extrusion speed of the punch is 1 mm / s.

[0054] Such as Figure 3-1 As shown, 4 to 8 vertical holes are provided on the upper end of the "T" shaped upper die 4 along the axial equidiameter as the small holes for feeding lubricant.

[0055] Such as Figure 3-2 As shown, the length L2 of the sizing belt of the "T"-shaped upper die 4 is 8.8mm, and the length L1 of the sizing belt of the "U"-shaped lower die 5 is 24mm; Considering the pressure angle, the connection surface between the sizing belt at the lower end of the "T"-shaped upper die 4 and the horizo...

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Abstract

The invention provides a differential-speed extrusion forming method of a magnesium alloy high performance cup-shaped piece and relates to the technical field of metal and plastic machining and forming. A combined concave die is adopted and comprises a T-shaped upper concave die body and a U-shaped lower concave die body. The T-shaped upper concave die body is internally provided with a cylindrical cavity and installed on the U-shaped lower concave die body, and the section of a formed revolved cavity is shaped like a Chinese character 'shan'. Staggered 'ladder' type differential-speed extrusion steps are adopted for the bottom of the extrusion cavity shaped like the Chinese character 'shan'. Three stages of deformation are conducted, the first stage is the axial similar cylinder pier coarse deformation stage, the second stage is the radial extrusion large deformation stage, and the third stage is the corner extrusion and shearing deformation stage. The extrusion cavity shaped like the Chinese character 'shan' and the staggered 'ladder' type differential-speed extrusion steps at the cavity bottom are adopted for extruding the magnesium alloy high performance cup-shaped piece, the magnesium alloy material forming capacity is greatly improved, a high-density structure is obtained, great plastic deformation is obtained, the grain refining effect is remarkable, the effect of eliminating grain dual-mode distribution of the barrel wall of the cup-shaped piece is obvious, and the fabrication procedure of the high performance magnesium alloy cup-shaped piece is shortened.

Description

technical field [0001] The invention relates to the technical field of metal plastic processing and forming, in particular to a differential extrusion forming method for extrusion forming and modification of magnesium alloy materials. Background technique [0002] Cup-shaped components are one of the most representative structural forms in the fields of aerospace, national defense, transportation, etc., and are typical parts of reverse extrusion technology. For the manufacture of cup-shaped parts, most of them use reverse extrusion forming technology. Reverse extrusion technology is an advanced less-cutting processing technology, which not only improves the shape and dimensional accuracy of forgings, saves metal materials, but also because of the metal fiber streamline The profiling improves the mechanical properties of this type of parts. It has the characteristics of "high efficiency, high quality, and low energy consumption". It has high use value in technology and econom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/18B21C25/02B21C23/32
CPCB21C23/18B21C23/32B21C25/02
Inventor 薛勇陈帅帅张治民李国俊王强白冰杨博文
Owner ZHONGBEI UNIV
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