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Processing method of magnesium alloy compressional deformation and mold

A technology of extrusion deformation and processing method, applied in metal extrusion dies, metal extrusion control equipment, metal extrusion, etc., can solve the problems of high energy consumption of equipment, insufficient ECAE technology, and many processes

Inactive Publication Date: 2008-04-09
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can realize the refinement of magnesium alloy grains to a very small degree, it has several shortcomings: first, the billet needs to be pre-extruded and deformed to initially refine the grains, so there are many processes, equipment, energy High cost and high cost: Second, multi-pass extrusion processing has many procedures, low production efficiency and high production cost; and because the extrusion speed of ECAE technology is 0.1-0.8m / min, the extrusion speed of each pass The extrusion time is relatively long and the production efficiency is low. If the one-way extrusion speed is increased, the product quality will be reduced
Therefore, in the case that industrial production needs to improve production efficiency, it is quite difficult to popularize and apply, and ECAE technology obviously has deficiencies.

Method used

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  • Processing method of magnesium alloy compressional deformation and mold
  • Processing method of magnesium alloy compressional deformation and mold
  • Processing method of magnesium alloy compressional deformation and mold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Referring to FIG. 1 , in this embodiment, an extrusion die formed by unidirectional extrusion, radial flow, and angle-changing angle is used, and AZ31 magnesium alloy rods are extruded and deformed on a vertical extruder. First, heat the magnesium alloy billet to 400°C for 15 hours for homogenization treatment. After homogenization treatment, the coarse dendrites disappear, making the chemical composition and structure of the ingot more uniform (as shown in Figure 3). Before extrusion, heat the mold to 220°C-430°C, evenly apply lubricant in the cavity of the extrusion channel of the mold, the lubricant is a glass lubricant with a particle size of glass powder: 109um-190um, and then fix the mold 3 On the workbench of the vertical extruder, heat the homogenized magnesium alloy billet to 250°C-450°C, the extrusion ratio is 4-60, and put it into the extrusion cavity 4 of the heated mold, The pressure rod 1 of the vertical extruder drives the upper punch 2 to perform constan...

Embodiment 2

[0038] Referring to Fig. 1, the present embodiment adopts the same type of variable channel angle extrusion die as the above embodiment, and the extrusion ratio is 20, that is, the diameter ratio of the transverse variable diameter cavity and the vertical cavity channel is: 1: 4.5, Before extrusion, the billet should be homogenized at 400°C for 15 hours to eliminate various dendrites and intermetallic compounds left during casting. The mold heating temperature range is 180°C, the lubricant used is glass powder with a particle size of 109um, the extrusion temperature is 200°C, the extrusion speed is 2m / min, and the extrusion force ranges from 10 to 12MPa Among them, the specific implementation process is: put the homogenized billet into the extrusion chamber 4, apply pressure from the pressing rod of the extruder to drive the punch 2 to move downward, and squeeze the billet by the punch 2 to make the magnesium The alloy billet flows, extrudes and deforms to the variable-diamete...

Embodiment 3

[0040] Referring to Figure 1, the extrusion ratio is 60, that is, the diameter ratio of the transverse variable diameter cavity channel to the vertical cavity channel is about 1:8, and the extrusion temperature is 250°C. The extrusion speed becomes: 1m / min, the extrusion force range is: 20-25MPa, and other conditions and implementation processes are the same as the previous two embodiments. The lower the temperature, the smaller the extrusion speed. For example, at 150°C, the extrusion speed should be controlled at about 0.5-1m / min.

[0041] The corner and fillet radius of the mold cavity of the present invention can be modified, and the fillet radius should be 2 mm to 5 mm within an appropriate range for better results.

[0042] The present invention is not only limited to processing various magnesium alloy bars, but also can extrude special magnesium alloy profiles in various forms by adopting an appropriate mold structure according to the structure of the radial variable-di...

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Abstract

The invention discloses a processing method and a die for the extruding deformation of the magnesium alloy, and adopts an extrusion die which unilaterally extrudes, radially flows and molds through a diameter changing angle, the extrusion ratio is four to sixty, antifriction material is uniformly coated in an extruding channel cavity of the die after the die is heated, then the semi finished metal of the magnesium alloy which is processed in uniformization is heated and put in the extrusion cavity of the heated die, and then passed through the downwards moved terne die of the extrusion die, with the extrusion speed of 0.5 m / min to 3 m / min and the extruding force of 3 MPa to 35 MPa at the same time, the die extrudes from the top end of the semi finished metal of the magnesium alloy in a constant speed, to lead the semi finished metal of the magnesium alloy to flow to the diameter changing cavity channel of the die extrusion cavity to be radially deformed. The invention adopts the unilateral extrusion die which extrudes, radially flows the diameter changing angle to deform, to not only hugely improve the refined effect of the magnesium alloy crystal grain, to lead the synthetic mechanical property of the magnesium alloy material to be improved, but also to achieve the extrusion speed to keep under the state of low temperature extrusion, to keep the quality of the shaped sample piece, thereby improving the production efficiency of the extrusion deformation process of the magnesium alloy.

Description

technical field [0001] The invention belongs to the field of extrusion deformation of magnesium alloys, in particular to an extrusion deformation processing method and mold of magnesium alloys. Background technique [0002] Magnesium alloy has a series of advantages such as low density, high specific strength and specific stiffness, good electromagnetic shielding, and easy regeneration. It is currently the lightest metal that can be used as a structural material. With the lightweight development requirements of industries such as automobiles, aviation, electronics and transportation, the application range of magnesium alloys is becoming wider and wider. However, magnesium is a metal with a hexagonal close-packed structure, which has few slip systems at room temperature and low temperature, low plasticity, easy brittle fracture, and poor cold working performance. For cast magnesium alloys that are widely used, the as-cast structure has coarse grains and low mechanical proper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/02B21C31/00B21C23/01B21C25/02C10M103/00
Inventor 刘天模刘宇张力卢立伟姜丹彭天成
Owner CHONGQING UNIV
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