Mold core of multi-inner-cavity revolving body structural component

Abstract

The invention relates to a mold core of a multi-inner-cavity revolving body structural component. The mold core comprises a sand core base which is embedded into the top of lower box molding sand, wherein a bottom sand core is superimposed on the center of the upper end surface of the sand core base, a middle sand core is superimposed on the bottom sand core, and a top sand core is superimposed on the middle sand core; the sand core base, the bottom sand core, the middle sand core and the top sand core are coaxial; the shape of the bottom sand core is consistent with that of a lower revolving inner cavity of the structural component, the shape of the middle sand core is consistent with that of a middle revolving inner cavity of the structural component, and the shape of the top sand core is consistent with that of an upper revolving inner cavity of the structural component. The center of each sand core is provided with a mandrel, the mandrel comprises a mandrel main rod as well as a mandrel concave end and a mandrel convex end, which are connected to two ends of the mandrel main rod, and the upper mandrel convex end can be inserted into the lower mandrel concave end. A core box comprises a core box soleplate and a core box side plate, and the mandrel is inserted in the center of the core box soleplate. By adopting the mold core, the formation of a complicated inner cavity structure of a large-sized multi-section high-precision revolving body casting can be realized.

Description

technical field [0001] The invention relates to a mold core of a multi-cavity revolving body structure, belonging to the technical field of metal casting. Background technique [0002] In the field of metal casting, structural parts with a diameter of more than 0.5m and a height of more than 1.5m are called large structural parts. For large multi-cavity revolving structural parts, the traditional manufacturing method is to segment the inner cavity according to the difficulty of manufacturing, then complete the casting and processing of each segment, and finally use the bolt connection scheme to realize the assembly of the overall structural part. In order to ensure sufficient strength of the bolted joint, the thickness of the connecting flange is generally a multiple of the wall thickness of the rotary body, resulting in a structural scheme that accommodates the process conditions and increases the weight of the parts. [0003] With the continuous upgrading of products, hig...

AI Technical Summary

Problems solved by technology

In addition, during the pouring and forming process of the casting, the bottom middle core is subjected to the axial gravity of the whole middle core, which produces outward stress and strain in the radial direction, which will seriously affect the radial yield of the bottom middle core, which is easy to cause The radial dimension of the relative position of the casting is out of tolerance or cracks

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