Mold core arbor for heterogeneous valve body

Abstract

The invention relates to a mold core arbor for a heterogeneous valve body. The mold core arbor comprises a hollow pipe arbor, wherein holes with uneven sizes and distribution are formed in a wall body of the arbor, and the holes with uneven sizes and distribution comprise at least one large hole 1 in at least one of local regions on the wall body of the arbor and at least one small hole 1 in at least one of the other local regions on the wall body of the arbor; and the areas of the large holes 1 are greater than those of the small holes 1, and the cross-section application force of the large holes 1 in the local regions is smaller than those of the small holes 1 in the other local regions. According to the mold core arbor for the heterogeneous valve body provided by the invention, the mold core can meet the requirements of intensity and rigidity, and each cross-section stress is even, so that the stress is even, the barrier when sands are jet can be effectively reduced, the working allowance can be reduced, the follow-up machining difficulty can be reduced, and high product yield can be obtained.

Description

technical field [0001] The invention relates to a core bone of a valve body, in particular to a core bone of an inhomogeneous valve body. Background technique [0002] Such as figure 1 As shown, in an existing implementation mode, most of the existing valve body core core bone adopts a hollow tubular structure, such as figure 2 As shown, another existing implementation, such as the Chinese utility model patent CN 201728336U discloses a large-scale excavator ultra-high-precision multi-way control main valve body sand mold, wherein a hollow core bone is embedded in the core, and the hollow The surface of the core bone is a honeycomb shape with evenly distributed small holes, which can improve air permeability. These core bones for valve body cores are all simple homogeneous core bones. The basic purpose is to enhance the strength of the core. For valve body cores with simple structures and general shapes, it can basically ensure that the core has good air permeability when ...

AI Technical Summary

Problems solved by technology

[0003] However, for valve bodies with complex shapes and high precision requirements, although this type of homogeneous core bone improves the strength of the core, the reinforcement is uniform, but the stress on the core is still uneven, resulting in The strain is of course also different, which eventually leads to uneven deformation of the casting, uncontrollable error, affects the quality of the casting, and causes an increase in the post-processing allowance or processing difficulties

Usually, this kind of core bone will also have a certain hindering effect on sand shooting, which will cause unrealized sand shooting due to insufficient sand shooting, affect the quality of sand molds, and eventually lead to defects in valve body castings

[0004] This kind of simple homogeneous core bone only considers factors such as core strength and air permeability from the perspective of experience, but does not specifically analyze the core structure, ignores factors such as uneven deformation after stress, and does not conduct a comprehensive analysis of the sand shooting situation.

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