Gypsum-mold vacuum pouring pressurized solidification casting method and device

Abstract

The invention discloses a gypsum-mold vacuum pouring pressurized solidification casting method and device. A casting wax mold, a casting system wax mold and a ventilation passage wax mold are manufactured according to the shape size of a to-be-cast part, the ventilation passage wax mold is pre-placed in a gypsum mold, and after the wax mold is removed, a ventilation passage is formed, pressurizedgas is flowed through the ventilation passage, and then the effect of casting mold cooling is achieved; and depending on the arrangement of the ventilation passage, the temperature distribution of thecasting is changed, so that the solidification sequence of the casting is adjusted, the casting tends to solidify in sequence, and the yield of the casting is favorably improved.

Description

technical field [0001] The invention discloses a gypsum type vacuum pouring pressurized solidification casting method and device, belonging to the technical field of casting methods. Background technique [0002] Gypsum mold precision casting is a new technology of precision casting developed in the 1970s. It assembles the investment mold and fixes it on the sand box plate specially used for grouting, pours the gypsum slurry in under vacuum, and after the slurry is condensed, it can be removed by drying, and then dried, Roasting becomes a gypsum type, and casting is obtained by casting under vacuum. The advantage of plaster casting is that it is excellent in remodeling, accurate and smooth, and can be applied to large and complex castings. The disadvantage is that the thermal conductivity of the gypsum mold is very low, and the cooling effect of the mold is poor. When the wall thickness of the casting varies greatly, defects such as shrinkage porosity and shrinkage cavity ...

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Problems solved by technology

[0003] In order to solve the problem of slow cooling of the plaster mold, the methods that have been developed mainly include: pre-embedding metal heat sinks in the plaster mold, such as using chilled iron castings, the rapid cooling process is limited by the shape and position of the metal heat sink, and the cooling effect is not good

[0004] In the magnesium alloy gypsum mold casting, the patent application with the publication number CN104209497A: a large complex thin-walled magnesium alloy piece gypsum mold casting method also adopts the method of placing amorphous cold iron at the hot joint to improve the cooling speed of the mold, and the shape is not fixed. The mixture components of cold iron are phenol resin, toluenesulfonic acid, boric acid, bentonite, chromite sand in mass percentage, and then the tank is filled with SF 6 dry air or CO 2 atmosphere, implement vacuum casting and pressurized solidification. On the one hand, this method is limited by the shape and position of the cold iron, and on the other hand, it needs to configure the mixture components, which is inconvenient and easy to cause poor exhaust. Stomata

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