Method for producing large-sized blank of wrought magnesium alloys

A technology for deformed magnesium alloys and large parts is applied in the field of preparing magnesium alloy billets, the diameter of which is larger than 300mm, and can solve the problems of coarse grains, high difficulty, and increased alloy solidification shrinkage. Economical and practical, reducing the tendency to crack, reducing the effect of thermal stress

Inactive Publication Date: 2007-09-19
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Large-section billets often have some quality problems: harmful intermetallic compound particle pollution, coarse grains, loose structure, etc.; in sand casting, there are also casting burning problems, which are not only visible burning on the liquid surface, but also casting molds. Potential internal combustion, making castings over 200mm in diameter difficult to produce
However, the rare earth increases the solidification shrinkage of the alloy, thereby increasing the difficulty of production by the semi-continuous casting method; for billets with a diameter greater than 300mm, the difficulty is even greater

Method used

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  • Method for producing large-sized blank of wrought magnesium alloys
  • Method for producing large-sized blank of wrought magnesium alloys
  • Method for producing large-sized blank of wrought magnesium alloys

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The implementation material is rare earth modified ZK60 alloy, the alloy composition is wt%: 6.26Zn-0.78Zr-0.66Y-Mg, and the blank size is a rod-shaped blank with a diameter of 350mm and a height of 700mm.

[0057] 1. The implementation material is smelted in a resistance furnace, and the pouring temperature is 710°C.

[0058] 2. The molding sand ratio is wt%: fine quartz sand 85, bentonite 3.5, magnesite 6, sodium alkylsulfonate (28% aqueous solution by weight) 3, boric acid 2, industrial sugar 0.5.

[0059] 3. An open pouring system is adopted, see Figure 2 and Figure 3. The straight gate is Φ35mm; the runner is trapezoidal: the upper and lower bottoms are 32 and 40mm, and the height is 40mm; the four rectangular inner gates are evenly distributed, and the section size of each rectangular gate is 120mm×12mm (height).

[0060] 4. The location of the cold iron around the billet is shown in Figure 1. The bottom surface and cylindrical surface of the billet are basicall...

Embodiment 2

[0064] The implementation material is rare earth modified ZK60 alloy, the alloy composition is wt%: 5.33Zn-0.89Zr-0.29Y-Mg, and the blank size is a rod-shaped blank with a diameter of 350mm and a height of 700mm.

[0065] 1. The implementation material is smelted in a resistance furnace, and the pouring temperature is 710°C.

[0066] 2. The proportion of molding sand is wt%: fine quartz sand 89, bentonite 4, acidic ammonium fluoride (NH 4 HF) 7.

[0067] 3. An open pouring system is adopted, see Figure 2 and Figure 3. The straight gate is Φ35mm; the runner is trapezoidal: the upper and lower bottoms are 32 and 40mm, and the height is 40mm; the four rectangular inner gates are evenly distributed, and the section size of each rectangular gate is 120mm×12mm (height).

[0068] 4. The location of the cold iron around the billet is shown in Figure 1. The bottom surface and cylindrical surface of the billet are basically surrounded by cold iron, so that the melt is basically not i...

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Abstract

The invention relates to a method for preparing the stock of deforming magnesium alloy large-scale element, comprising following key processes: (1) using the flame-proof mould sand; (2) using cool iron to control the direction and speed of concretion; (3) using stable fondant flowing process as open casting system; (4) using large-scale to repair the feeder head; (5) using gas protection on the mould cavity and orifice; (6) using high temperature fondant to drop said feeder head and feeding feeder head fully. The invention can prepare the demanded stock when the magnesium alloy has higher heat crack tendency which is hard to produced by semi-continuous casting. Via aforementioned processes, the invention can reduce defects of large, loosen, and lower-mechanics property organism and the burning problem in the founding process. The invention can apply the large-scale magnesium alloy cast.

Description

technical field [0001] The invention relates to the preparation technology of large-scale magnesium alloy castings, in particular to a preparation method for preparing magnesium alloy blanks, especially a large-scale deformed magnesium alloy blank with a diameter greater than 300mm. Background technique [0002] Magnesium alloy has the characteristics of low specific gravity, high specific strength and specific stiffness, good shock absorption performance, low cost, high recovery rate and no pollution, and is known as "green material". Substituting magnesium alloys for aluminum and steel (especially for large load-bearing structural parts) can greatly reduce weight. Weight reduction is of great economic significance to aerospace, aviation and transportation tools. In addition, weight reduction can directly reduce fuel consumption and improve human survival. environment. At the same time, the development and utilization of magnesium alloys is also conducive to the transforma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D21/04
Inventor 刘路徐永波高国忠陈荣石韩恩厚
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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