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Vacuum pouring method for gypsum mold high-precision casting of aluminum and magnesium alloy

A technology of vacuum pouring and precision casting, which is applied in the direction of casting molding equipment, cores, casting molds, etc., to achieve the effects of short time, improved casting quality and fast speed

Inactive Publication Date: 2012-03-21
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the deficiencies in the pouring process of complex and thin-walled precision aluminum-magnesium alloy castings, the present invention proposes a vacuum pouring method suitable for aluminum alloy or magnesium alloy gypsum precision casting. Control the vacuum degree in the cavity and the time of vacuuming to control the process parameters, thereby improving the quality of the casting, with the advantages of simple operation and easy control

Method used

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  • Vacuum pouring method for gypsum mold high-precision casting of aluminum and magnesium alloy
  • Vacuum pouring method for gypsum mold high-precision casting of aluminum and magnesium alloy
  • Vacuum pouring method for gypsum mold high-precision casting of aluminum and magnesium alloy

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Embodiment 1

[0015] Example 1: It is required to adopt gypsum mold precision casting technology to cast a bracket for an aircraft, and its size is 400mm long, 250mm wide and 300mm high.

[0016] (1) prepare the slurry, and place 4 thin steel pipes 4 (diameter is 4mm) at different positions of the process boss 5 in the mold cavity, lead the outlet of the thin steel pipes 4 to the top of the gypsum mold 7, and connect to In a thick vacuum tube 3, the gap between the thin steel tube 4 and the thick vacuum tube 3 is blocked with a plastic film 2 to prevent the slurry from entering the plug hole when grouting. Manually stir the prepared gypsum mixed slurry slowly to remove air bubbles in the slurry as much as possible, pour the mixed slurry into the sand box, and apply vibration on the sand box while grouting until the grouting is completed;

[0017] (2) After the gypsum mixture is hardened, remove the sand box, and move the gypsum type 7 into the oven.

[0018] (3) Take out the dried gypsum m...

Embodiment 2

[0019] Example 2: It is required to adopt gypsum mold precision casting technology to cast an aviation cast magnesium AZ91 cylindrical part, the size of which is 1200mm in diameter, 200mm in height and 6mm in wall thickness.

[0020] (1) prepare the slurry, and place 5 thin steel pipes 4 (diameter is 8mm) at different positions of the process boss 5 in the mold cavity, lead the outlet of the thin steel pipes 4 to the top of the plaster mold 7, and connect them to a In the thick vacuum tube 3, the gap between the thin steel tube 4 and the rough vacuum tube 3 is blocked with a plastic film 2 to prevent the grout from entering the plugged tube hole. Manually stir the prepared gypsum mixed slurry slowly to remove air bubbles in the slurry as much as possible, pour the mixed slurry into the sand box, and apply vibration on the sand box while grouting until the grouting is completed;

[0021] (2) After the gypsum mixture is hardened, remove the sand box, and move the gypsum type 7 i...

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Abstract

The invention discloses a vacuum pouring method for gypsum mold high-precision casting of aluminum and magnesium alloy, which comprises: (1) manufacturing a gypsum mold; (2) removing the mold and drying; and (3) pouring vacuum pouring, taking the dried gypsum out, clearing the impurities in a molding cavity, connecting a vacuumizing tube and a vacuum pump, sealing the pouring opening, vacuumizingby using a vacuum pump, starting pouring, and stopping the vacuum pump at the end of the pouring, and cooling to room temperature. In the method adopted by the invention, a discharge pipe is mounted in the molding cavity of the mold directly, the number, diameter and mounting position of thin steel pipes can be determined according to the shape and complexity of castings, and the operation is easy. In addition, the size of the casting is not limited, and the process is effectively simplified.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a vacuum pouring process for precision casting of aluminum and magnesium alloys, and is especially suitable for liquid precision forming of large complex thin-walled aluminum-magnesium alloys. Background technique [0002] In recent years, domestic and foreign industries such as aviation, aerospace, automobiles, ships, weapons and other industries have become more and more integrated in structure and function, and the trend of light weight has become more and more obvious. Use an integral aluminum-magnesium alloy casting instead. These castings have complex shapes, thin walls, and high dimensional accuracy requirements. At present, the forming processes of such integral aluminum-magnesium alloy castings mainly include sand casting and plaster casting. [0003] Large and complex thin-walled aluminum-magnesium alloy parts due to fast cooling rate and significant tempe...

Claims

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Application Information

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IPC IPC(8): B22C9/04
Inventor 董选普程鲁易成李建军马戎樊自田凌宏江
Owner HUAZHONG UNIV OF SCI & TECH
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