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Rare-earth magnesium alloy seamless thin wall tubule hot-extrusion method and its specialized mold

A seamless thin-walled, rare-earth magnesium technology, used in metal extrusion dies, metal extrusion, metal extrusion control equipment, etc., can solve the problems of large extrusion deformation force, narrow processing range, and high blank requirements. The effect of small extrusion force, good surface quality and simple mold structure

Inactive Publication Date: 2009-10-07
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the plastic processing technology of magnesium alloy is not yet mature, and the production of magnesium alloy tubes, especially high-precision magnesium alloy thin-walled thin tubes, still has problems such as large extrusion deformation force, narrow processing range, and high requirements for blanks.
The plastically deformed blanks are also mainly concentrated in the AZ series of easily deformable magnesium alloys. There are few studies on the plastic deformation of rare earth magnesium alloys with high thermal stability. Such magnesium alloys are more difficult to extrude. Squeeze of has not been reported yet

Method used

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  • Rare-earth magnesium alloy seamless thin wall tubule hot-extrusion method and its specialized mold
  • Rare-earth magnesium alloy seamless thin wall tubule hot-extrusion method and its specialized mold
  • Rare-earth magnesium alloy seamless thin wall tubule hot-extrusion method and its specialized mold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1 - In this example, a Mg-4.0Y-2.0Nd-0.4Zr magnesium alloy seamless tube with an outer diameter of 8 mm and an inner diameter of 6 mm was hot-extruded.

[0043] The special mold structure used in this embodiment is as follows: figure 1 shown. Extrusion cylinders 4 and 5 adopt a two-layer prestressed combined structure with temperature measuring holes 6, and the diameter of the working inner hole is 20mm; Diameter is 6mm; pre-extrusion die 12 (see figure 2 ) or forming die 12 (see image 3 ) is fixed on the lower mold base 7 through the extrusion cylinder, wherein the diameter of the pre-extrusion concave mold cavity is 6mm, and the diameter of the forming concave mold cavity is 8mm; the outside of the extrusion cylinder adopts a glass fiber insulation layer 3; The position pressure head 8 ensures that the punch is not directly pressed on the forming die;

[0044] The specific process steps of extruding the Mg-4.0Y-2.0Nd-0.4Zr rare earth magnesium alloy seam...

Embodiment 2

[0053] Example 2 - In this example, a Mg-4.0Y-2.0Nd-0.4Zr magnesium alloy seamless tube with an outer diameter of 7.2 mm and an inner diameter of 6 mm was extruded.

[0054] The mold used in this example is basically the same as that in Example 1, except that the cavity diameter of the forming die used is 7.2mm, and the extrusion temperature is 400°C.

[0055] The specific process steps adopted in this example are based on Example 1, adjusting the extrusion speed to 3mm / s, the extrusion ratio to 25, and the solution aging treatment parameters to 500°C×2h+180°C×16h.

[0056] The maximum extrusion force in the extrusion process of this embodiment is 161KN, and the cup-shaped remaining material is less than 1% of the billet. The obtained Mg-4.0Y-2.0Nd-0.4Zr magnesium alloy seamless thin-walled thin tube has a smooth surface, a wall thickness difference of less than 0.05 mm, a grain size of less than 5 μm, a tensile strength of 246 MPa, and an elongation of 28.2%. After solid sol...

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Abstract

The invention relates to a rare-earth magnesium alloy seamless thin wall tubule hot-extrusion method and its specialized mold. The method includes: machine-tooling after casting ingot homogenization treatment into a hollow blank, performing pre-extrusion in the mold, extrusion molding after die change, and performing solid dissolving aging treatment for further improving the tube dynamics performance. The invention relates to a special mold, including an upper and a lower die holders, a thermal insulation sleeve, a squeezing barrel, a male die and a concave die, wherein, the concave die is composed of a pre-extrusion concave die and a shaping concave die, one of the pre-extrusion concave die and the shaping concave die is selected and interchangeable with the other, and is fixed on the lower die holder through a squeezing barrel. The invention can extrude a rare-earth magnesium alloy seamless thin wall tubule with the external diameter of 5-10mm and internal diameter of 4-8mm, which has features of high material utilization, small extruding force, high products dimensional precision, good surface accuracy, good dynamics performance and the like features. The inventive mold simultaneously has advantages of simple structure, easy operation, low cost, long life and so on.

Description

technical field [0001] The invention relates to a magnesium alloy hot extrusion forming technology, in particular to a rare earth magnesium alloy seamless thin-wall thin tube hot extrusion method and a special mold thereof. Background technique [0002] As the green engineering material with the most development and application potential in the 21st century, magnesium alloy is widely used in aviation, aerospace, automobile and electronics industries. Because magnesium and magnesium alloys have a close-packed hexagonal structure, less slip systems, and poor plastic forming ability, magnesium alloys are given priority in the field of die-casting and development. But magnesium alloys produced by extrusion, forging, rolling and other processes have higher strength, better ductility and more diverse mechanical properties. In recent years, the plastic processing technology of magnesium alloys has received more and more attention and research. [0003] In the manufacturing indust...

Claims

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Application Information

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IPC IPC(8): B21C23/08B21C23/01C22F1/06C21D9/08C21D11/00B21C31/00C10M125/02B21C25/02B21C27/00B21C26/00
Inventor 高家诚李伟
Owner CHONGQING UNIV
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