Balanced solidification casting structure and method for thick and large parts of castings

Abstract

The invention discloses a balanced solidification casting structure and method for thick and large parts of castings. The balanced solidification casting structure involves an appearance sand mold, ariser is arranged at the top of the appearance sand mold, at least one cooling rod is arranged at the bottom of the appearance sand mold, one ends of the cooling rods are fixed to the inner side of the bottom of the appearance sand mold, and the other ends of the cooling rods extend into the wide position inside a cavity and are located at the position where the riser cannot conduct feeding, and the material of the cooling rods is the same as or close to that of the castings. The structure and method have the advantages that the structure is simple, and the shrinkage porosity of thick and large parts of the castings is reduced.

Description

technical field [0001] The invention relates to the technical field of engine accessory assembly, in particular to a casting structure and method for balanced solidification of thick and large parts of a casting. Background technique [0002] Casting is an extremely widely used workpiece, which is produced by casting method. Casting is a metal thermoforming method. The process is to inject liquid metal into the casting cavity. After the liquid metal solidifies, remove the cavity, and the solidified solid metal The shape is the desired casting. Cavities include sand mold cavities, metal mold cavities and other types. Sand mold cavities are disposable cavities, and metal mold cavities are reusable cavities. This scheme is suitable for sand mold cavities. [0003] The liquid metal will shrink when it solidifies in the cavity. The shrinkage includes the overall shrinkage of the casting and the local shrinkage of the casting. The overall shrinkage shows that the shape of the cas...

AI Technical Summary

Problems solved by technology

At the same time, there needs to be a wide enough feeding flow channel between the riser and the position that needs to be fed. If the shape between the thick position and the riser is narrow, the solidification will be faster, the channel will be blocked, and the riser will not be thick. positional packing

[0006] In addition, in the prior art, when further processing the shrinkage and porosity of the thick and large parts of the casting, a piece of chilled iron is placed outside the bottom of the sand mold to reduce the shrinkage of the thick and large parts of the casting, but the effect is not ideal, and the application of the chilled iron is limited. The external environment is greatly affected, so it is difficult to control the chilling effect of the cold iron

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