Coating for sand casting of rare-earth magnesium alloy coated sand and method of use thereof

A technology of sand casting and coated sand, which is applied to casting molding equipment, coatings, casting molds, etc., to achieve the effect of simple production, improved surface quality and internal quality

Inactive Publication Date: 2008-10-08
NO 52 INST OF CHINA NORTH IND GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a rare earth magnesium alloy coated sand sand mold which can effectively solve the phenomenon of reaction between magnesium alloy and sand mold during coated sand sand casting, thereby improving the surface quality of castings. Foundry coatings and methods of use thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] According to specific requirements, when casting an asymmetric thin-walled rare earth magnesium alloy containing Nd and Y, the thinnest part of the mold is only 4mm, and the coated sand mold is heated to 280°C. At 160°C, it is necessary to control the temperature rise rate of the sand cavity surface not to exceed 2°C / min. The mass percent of raw materials for preparing a coating at this temperature is: 2.0% zirconia, 3.0% boric acid, 0.50% water glass, 2.0% chalk powder, 0.5% graphite powder, and the balance is water. Stir the above paint with a high-speed rotary mixer for 5 minutes and mix thoroughly. Under this temperature condition, the paint is evenly and slowly sprayed on the surface of the coated sand mold with an air compressed spray gun.

[0038] Analyzing the rare earth magnesium alloy asymmetric thin-walled parts obtained in this way, it can be seen that the surface of the obtained castings is dense and smooth, and the performance is good, which meets the tar...

Embodiment 2

[0040] According to specific requirements, when casting a heat-resistant rare earth magnesium alloy part of an engine, the coated sand mold is brushed with paint at room temperature, and the mass percentage of raw materials required to prepare a paint at this temperature is: zirconia 19.9 %, boric acid 14.8%, water glass 6.5%, chalk powder 10.0%, graphite powder 5.0%, and the balance is water. Stir the above paint with a high-speed rotary mixer for 25 minutes and mix thoroughly. Under this temperature condition, brush the paint evenly and slowly on the surface of the coated sand mold with a fine brush.

[0041] Analyzing the heat-resistant rare earth magnesium alloy parts of the engine obtained in this way, it can be seen that the obtained casting has smooth surface, compact structure and good surface performance, which meets the requirements of the heat-resistant rare earth magnesium alloy parts of the engine, and at this temperature Under these conditions, the strength of t...

Embodiment 3

[0043] Cast a large rare earth magnesium alloy aviation part according to specific requirements. The diameter of the part is about 200mm, the highest height is 250mm, the thinnest wall thickness is 5mm, and the thickness difference with other parts is up to 10mm. The sand mold is sprayed with a compressed air spray gun at a temperature of 100°C. At this temperature, the mass percentages of raw materials required to prepare a coating are: 12.0% zirconia, 9.2% boric acid, 3.6% water glass, 5.9% chalk powder, graphite powder 2.8%, and the balance is water. Use a high-speed rotary mixer to fully stir the above paint for 20 minutes, fully dissolve and mix, and then use it after standing still. Under this temperature condition, the paint can also be evenly and slowly brushed on the surface of the coated sand mold with a fine brush.

[0044] The rare earth magnesium alloy aerospace parts obtained in this way were analyzed, and the casting surface obtained was smooth, the surface str...

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Abstract

The invention relates to a coating for sand mold casting of a rare earth magnesium alloy-coated sand and a using method thereof, the weight percentages of raw materials of the coating are: 2 to 20 percent of zirconium oxide, 3 to 15 percent of boric acid, 2 to 10 percent of chalk powder, 0.5 to 6.5 percent of water glass, 0.5 to 5 percent of graphite powder and the rest of water. The coating is prepared by the preparation step of the components. The coating can be directly carried out the brush coating or spray coating by a spray gun on the sand mold surface of the coated sand according to sand mold cavity surface temperature, thus inhibiting and reducing the reaction of the rare earth magnesium alloy melt and the sand mold, raising the pre-heating temperature of the coated sand mold, improving the mold filling ability of the alloy melt, improving the molding performance of the rare earth magnesium alloy and significantly improving the surface quality and the internal quality of a cast, which can particularly play the obvious effect of the thin-walled cast, the production process of the coating is simple, the usage has no harm to the human body under the room temperature and has no environmental pollution.

Description

technical field [0001] The invention relates to a method for preparing and using a paint, in particular to a rare earth magnesium alloy coated sand sand casting paint and a method for using the paint. Background technique [0002] With the increasingly wide application of magnesium alloys in the automotive industry, aerospace industry, electronic devices and other fields, higher and higher requirements are placed on the quality and dimensional accuracy of magnesium alloy load-bearing castings, and the traditional magnesium alloy sand casting method There are often problems such as the reaction between the sand mold and the magnesium alloy melt, the surface of the casting is rough, sand inclusions and oxidation inclusions appear inside, the mechanical properties of the casting are low, and the corrosion resistance is reduced. Although the currently used coated sand sand casting is suitable for manufacturing thin-walled parts with complex structures, there are no special measu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00B22C23/02
Inventor 徐永东宋运坤朱秀荣赵国田周灵展高明灯费良军王荣张广明杨波
Owner NO 52 INST OF CHINA NORTH IND GRP CORP
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