Special core bone for stage clapboard casting sand core

Abstract

A special arbor for sand cores of staged partition board type castings comprises an outer main part, an inner main part and a plurality of connecting ribs, wherein the outer main part and the inner main part are connected by the same cord framework, and the plurality of connecting ribs are connected between the outer main part and the inner main part; each connecting rib comprises a near-center end connecting rib, a far-center end connecting rib and a local connecting rib, and the diameter of the local connecting rib is smaller than that of the near-center end connecting rib and the far-centerend connecting rib to adapt to inner openings of crescent ribbed plates of sand cores of the staged partition board type castings. The special arbor can effectively prevent cracking of the sand coresand the quality of the sand cores is guaranteed. The arbor can effectively resist buoyancy of molten iron during casting, so that the castings cannot deform; the problems of drifting and breakage ofthe sand cores of ultra-complex staged partition board type products are solved, meanwhile, the field operation is simplified, the production efficiency is improved, the production cost is reduced, and the product quality is improved.

Description

technical field [0001] The invention relates to the technical field of sand casting, in particular to a core bone specially used for sand cores of castings such as stage partitions. Background technique [0002] In the casting production process, some castings are restricted by the structure of the casting, and the sand core is deformed during the placement process. After the molten iron enters the cavity, the sand core will be subject to a large buoyancy force, which will cause the core to float or even break the sand core and deform the sand core. And other problems occur, which in turn leads to defects such as casting size mismatch, sand inclusions, and surface veins. [0003] This problem is particularly prominent in ultra-complex stage partition products, because the structure of stage partition castings is relatively complex and requires high dimensional accuracy, and the inner cavity is a suspended structure, and the middle part of the sand core is connected to the ou...

AI Technical Summary

Problems solved by technology

[0007] The special core bone of the present invention can effectively prevent the cracking of the sand core and ensure the quality of the sand core; it can effectively resist the buoyancy from the molten iron during the pouring process, thereby ensuring that the casting will not be deformed; The problem of product sand core floating and fracture, while simplifying on-site operations, improving production efficiency, reducing production costs, and improving product quality

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