Casting method for sand shell core pattern

Abstract

The invention provides a casting method for a sand shell core pattern. According to the casting method for the sand shell core pattern, the sand shell core pattern is formed by adopting precoated sand, cold core resin sand, hot core resin sand and other methods. The method is characterized in that a negative pressure casting box and a unit model of the sand shell core pattern A are provided, wherein the unit model of the sand shell core pattern A is composed of two core templates which are arranged in a laminated mode; a board of the unit model of the sand shell core pattern A is vertical andis attached to an adjacent outer board of the unit model of the sand shell core pattern A, the board and the adjacent outer board are restrained and fixed by a clamping and fixing part, and the bottomof the sand shell core pattern A and the bottom of the casting box are kept to be arranged at intervals; filling sand is injected into a gap between the sand shell core pattern A and the casting boxuntil the filling sand is wrapped around a precoated sand mold; a plastic film covers a box opening of the casting box, a casting gate penetrates through the film and is exposed, and a small amount ofsand is spread to press the plastic film; and then casting is carried out with casting liquid. The method can be suitable for the casting molding operation of a common sand box and can also be suitable for 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 casting 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-sized metal castings mainly adopts the method of buried sand casting; It is composed of two core templates that are arranged in close contact. The cavity plate surface of each core template is densely covered with semicircular cavities a. A circular cavity for forming steel balls, and a molten steel flow channel c connected to each other for connecting the main runner b is set between the circular cavity a, such as Figure 1-3 As shown, put an appropriate number of unit molds together and fix a group of casting molds by the end plates and the tie rods connecting the end plates. The several groups of casting molds are placed in the box and filled with...

AI Technical Summary

Problems solved by technology

[0004] Regardless of whether the negative pressure environment is used for casting, 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 first spread a certain thickness of filling sand in the box as The sand on the bottom layer, and then place the pouring modules group by group on the sand pad on the bottom layer, and then continue to inject the filling sand. The injection process of the filling sand is completed in two times, that is, the sand filling operation needs to be interrupted in the middle; after the casting is completed The operation of collecting the castings is also difficult, because the carbonization of the coating agent material in the sand shell core mold has no integrity and strength due to the baking of high-temperature liquid injection. Due to the obstruction of filling 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 separate. Inspection and collection of castings

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