Sand shell core casting method

Abstract

The invention provides a sand shell core casting method formed by coated sand, cold core resin sand, hot core resin sand and any other method, providing negative pressure sand box and unit mold of sand shell core type A, sand shell core The unit form of type A is composed of two core formworks arranged in close contact; the plate surface of the unit form of sand shell core type A is vertical and the outer plate surface of the adjacent unit form of sand shell core type A is arranged against each other and Constrained and fixed by the clamping and fixing part, the distance between the bottom of the sand shell core type A and the bottom of the flask box is kept; the filling sand is injected from the gap between the sand shell core type A and the sand box until it is covered around the coated sand mold; Cover the mouth of the sand box with a plastic film, the sprue passes through the film and is exposed, and spreads a small amount of sand to press the plastic film; then pours the pouring liquid. It can be applied to the forming operation of negative pressure casting.

Description

technical field [0001] The invention belongs to the field of sand shell core mold casting, and in particular relates to a pouring method for sand shell core molds of small and medium-sized metal castings. Background technique [0002] At present, the traditional sand shell core casting used for the production of small and medium metal castings mainly uses buried sand Pouring method; this method needs to firstly make a sand shell core mold (that is, a core mold) used as a product cavity. The unit mold is composed of two core templates that are arranged in a close relationship. The cavity plate surface on each core template The semicircular cavities a are densely covered. After the two core templates are bonded, the semicircular cavities between them correspond to each other and form a circular cavity of steel balls to be formed. The circular cavities a are connected to each other for connection The molten steel runner c of the main runner b, such as Figure 1-3 As shown, pu...

AI Technical Summary

Problems solved by technology

[0004] Regardless of whether the negative pressure environment is used for pouring, it is necessary to stick an appropriate number of unit molds together and fix them as a group of casting molds by the end plates and the tie rods connecting the end plates, and spread a certain thickness of filling sand in the box as a Bottom pad sand, then place the pouring modules in groups on the bottom pad sand, and then continue to inject filling sand, the filling sand injection process is completed in two times, that is, the sand filling operation needs to be interrupted in the middle; after pouring, collect The operation of castings is also more difficult, because, due to the baking of high-temperature liquid injection, the carbonization of the coating agent material in the sand shell core mold has no integrity and strength at all. When the end plate and the tie rod for connection are lifted, the filling Blocked by sand, the core mold of the sand shell is broken and scattered, making it impossible to collect the castings. If the box is turned over and dumped directly, the end plates and tie rods for connection will be mixed with sand mold waste and filling sand, and the castings are also difficult to sort. , Collect castings

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