Plaster casting method for large-sized complex thin-walled magnesium alloy part

A magnesium alloy and gypsum molding technology, which is applied to casting molding equipment, molds, cores, etc., can solve problems such as difficulty in mold filling, slow solidification of magnesium alloys, and low latent heat of solidification of magnesium alloys.

Active Publication Date: 2014-12-17
山西银光华盛镁业股份有限公司
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Problems solved by technology

Magnesium alloy has less solidification latent heat, and the thin wall may not be poured enough, especially the large flat part with thin wall is difficult to fill; the gas permeability of the gypsum mold is very

Method used

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  • Plaster casting method for large-sized complex thin-walled magnesium alloy part

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Embodiment Construction

[0018] Before using the pressure-regulating casting equipment, the process parameters are optimized and the best implementation plan is found through three-dimensional modeling, solid modeling, and numerical simulation of the casting. In the best plan, the process and parameters of pattern coating, hot joint setting of unshaped chill iron, pressure regulating casting, etc. are the theoretical basis of the present invention, and become actual process after actual test and improvement. Polystyrene steam foams to manufacture pattern blocks, after assembling into patterns, paint, dry, stick unshaped cold iron on hot joints, place patterns in mold frames after solidification, and pour gypsum slurry. Hardening, drying, and firing into plaster molds.

[0019] first step

[0020] modeling and simulation phase. Numerical simulation and process optimization are carried out on the present invention and related premise gypsum casting technology, so that the implementation of the formula...

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Abstract

The invention relates to a plaster casting method for a large-sized complex thin-walled magnesium alloy part. The method comprises the following steps of coating the surface of an assembled form with a coating in situ, and arranging shapeless cold iron on a hot spot part, wherein a mixture for manufacturing the shapeless cold iron comprises the following components in percentage by mass: 1.25 percent of phenolic resin, 0.4 percent of toluenesulfonic acid, 1 to 1.5 percent of boric acid, 2 percent of bentonite and the balance of 70 to 140-mesh chromite sand; pouring a casting in an adjustable pressure casting device, arranging a plaster mold poured by the form at the casting position of the adjustable pressure casting device, filling a tank with dry air or a CO2 atmosphere with SF6 content of 0.1 to 1.0 percent, and performing vacuum casting and pressurized solidification, wherein the casting temperature is 710 to 750 DEG C, vacuum degree for primary mold filling is minus 0.6Mpa to minus 0.8Mpa, and the solidification pressure is 0.020 to 0.025Mpa. According to the method, oxidization can be prevented, the mold filling capability can be improved, shrinkage cavities and shrinkage porosities in the casting are reduced, and the obtained magnesium alloy casting is higher in density.

Description

technical field [0001] The invention relates to a casting method, in particular to a gypsum mold casting method for a large complex thin-walled magnesium alloy piece. Background technique [0002] Sand casting is mostly used for large magnesium alloy castings, but the precision of the castings is low, and it is very difficult to produce large-sized, thin-walled and complex castings. Therefore, in recent years, many research and development workers have carried out a series of research on the application of gypsum molds in magnesium alloy casting. When casting high-magnesium-containing aluminum alloys and magnesium alloys in gypsum molds, there are many oxidized inclusions, high liquid surface tension, poor mold filling effect, and a high tendency to produce defects such as pores, inclusions, and shrinkage porosity. The main reason is that the chemical activity of magnesium is high, and its liquid temperature will have a violent exothermic reaction with gypsum. Therefore, gy...

Claims

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Application Information

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IPC IPC(8): B22D21/04B22D18/06B22C9/06B22C3/00
Inventor 李华伦孙伟明焦婧
Owner 山西银光华盛镁业股份有限公司
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