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Semi-solid state flexible extrusion molding technique for shaped complex parts

A technology for extrusion forming and complex parts, which is applied in the field of extrusion and semi-solid forming, can solve the problems of low production efficiency, high production cost, high energy consumption, etc., and achieve the effect of reducing energy consumption, less cost input, and simple equipment

Inactive Publication Date: 2007-08-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] On the other hand, with the rapid development of the fields of automobile, electronics and aerospace, the complexity of its parts is getting higher and higher, such as complex parts with variable cross-section in three-dimensional direction, conventional low production Manufacturing methods with high production costs have become incompatible

Method used

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  • Semi-solid state flexible extrusion molding technique for shaped complex parts
  • Semi-solid state flexible extrusion molding technique for shaped complex parts

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preparation example Construction

[0036] ① Preparation of semi-solid slurry

[0037] The preparation of semi-solid billets with uniform composition, structure and properties, and round and fine particles is the prerequisite for flexible extrusion of complex parts. For semi-solid thixotropic extrusion, it is easy to obtain a billet with semi-solid structure characteristics (such as a blank obtained by the SIMA method) by using an induction heating furnace for secondary heating, so that the blank becomes a semi-solid billet with a certain solid fraction. , and then to the research content ③Flexible extrusion forming; for semi-solid rheological extrusion forming, first use a resistance furnace to heat the dried block commercial alloy ingot (for magnesium alloy materials, argon is used as the shielding gas, use The foamed magnesium alloy covering agent protects the molten magnesium alloy liquid), and after reaching the complete melting temperature, keep the heat preservation and stand for 30 minutes.

[0038] ②De...

Embodiment 1

[0049] Semi-solid thixotropic flexible extrusion using A356 aluminum alloy to form complex parts in Fig.-1.

[0050] Assume that the diameter of the blank bar is φ56mm, the length is 60mm, and the material is A356 aluminum alloy. The raw material for semi-solid forming can be purchased from the Duralcan company. First, the induction heating furnace is used to quickly and uniformly heat the semi-solid temperature range that is most suitable for extrusion forming: 577°C-581°C, and then the heated semi-solid billet is quickly put into the lower die of the extrusion die with a clamp (die pre-set The heat temperature is set at 200°C-300°C). The extrusion speed of the press is adjusted to 50mm / s-90mm / s, graphite release agent is used, the forming pressure is set to 400KN-600KN, and the holding time is set to 5-10 seconds. The three-dimensional variable cross-section complex parts shown in Figure-1 can be flexibly extruded using the above parameters.

Embodiment 2

[0052] Semi-solid thixotropic flexible extrusion using AZ91 magnesium alloy to form complex parts in Figure-1.

[0053] Assume that the diameter of the blank bar is φ56mm, the length is 60mm, and the material is AZ91 magnesium alloy. The raw material for semi-solid forming can be purchased from the Duralcan company. First, use an induction heating furnace to quickly and uniformly heat to the most suitable semi-solid temperature range for extrusion: 579°C-584°C, and use argon as a protective gas at the same time. The heated semi-solid billet is quickly put into the lower die of the extrusion die with a clamp (the preheating temperature of the die is set at 200° C.-300° C.). The extrusion speed of the press is adjusted to 60mm / s-100mm / s, graphite release agent is used, the forming pressure is set to 400KN-600KN, and the holding time is set to 5-8 seconds. The three-dimensional variable cross-section complex parts shown in Figure-1 can be flexibly extruded using the above param...

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Abstract

The invention relates to a semi-slid flexible extruding shaping method for obtaining complex element. And the method comprises that preparing semi-solid slurry, designing the device for constantly quickly feeding semi-solid slurry, and extruding and shaping complex element. For semi-solid touch extruding shaping, the invention uses sensitive heating furnace secondary heating to obtain the blank of semi-solid organism character, and for semi-solid flow extruding shaping, the invention first uses resistance furnace to heat the dried alloy ingot, and laid thermal-insulated at fusing temperature. The invention can realize complex element in short process, reduce energy consumption and improve product quality.

Description

technical field [0001] The invention relates to a semi-solid flexible extrusion forming method for forming complex parts, and belongs to the technical field of extrusion and semi-solid forming. Background technique [0002] With the increasingly prominent environmental and energy issues, more and more attention has been paid to the issue of sustainable development in our country. Constantly adjusting and improving the growth mode and development direction of industrial enterprises will gradually push my country from a large processing country to a powerful processing country. Put forward two requirements: ① constantly pursue high efficiency, high quality, strengthen independent innovation; ② save resources, energy and pollution-free. Compared with non-metallic materials, metal materials have obvious advantages in terms of price, environmental protection, and cost performance, so they will remain the main global industrial raw materials for a long time to come, and will contin...

Claims

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Application Information

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IPC IPC(8): B22D18/02B22D21/02B21C23/00
Inventor 王开坤
Owner TSINGHUA UNIV
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