Half molds of core box of ductile cast iron pipe with large aperture

Abstract

The invention discloses half molds of a core box of a ductile cast iron pipe with a large aperture. The number of the half molds is two, the half molds are installed on a core box base, guide rails, cylinders and guide rods are used to realize separation and combination of the two half molds, one end of the inner hole of each half mold is matched with a bottom plate, the half molds, the bottom plates and core rods form cavities of cores, and an inner hole corresponding to the ductile cast iron pipe body on the half mold is a through aperture. The above technical scheme removes the boss parts on the half molds, ensures the wall thickness of the half molds of the core box to be uniform, reduces the half mold casting difficulty, reduces the cast machining amount, lowers the production cost, and reduces the contact area between the half molds and the base as well as between the half molds and the cores, thus reducing the dead weight of the half molds, the friction between the half molds and the base and the cohesive force between the half molds and the cores, and reduces the energy consumption, reduces the damage rate of the half molds, improves the precision and yield of the cores and reduces the labor intensity of the workers.

Description

technical field [0001] The invention belongs to the technical field of production process equipment in the metallurgical industry, and relates to the process equipment of a large-diameter cast iron pipe production line. More specifically, the invention relates to a half-mold of a large-diameter ductile iron tube core box. Background technique [0002] The shape and size of the inner cavity of the large-diameter cast iron pipe socket are formed and guaranteed by the socket sand core. The production process of centrifugal casting pipe requires that the sand core has good dimensional accuracy and high sand core strength. In addition, its production efficiency should also meet the requirements of mass production. [0003] In order to ensure the smooth butt joint installation of the finished centrifugal cast pipe, ensure the good sealing performance of the pipeline interface, and achieve the specified test pressure during the pressing process, the tooling design and manufacturing...

AI Technical Summary

Problems solved by technology

After the upper boss 11 of the half-mold 4 falls off, it cannot form a closed contour with the bottom plate 6 and mandrel 5, which will cause defects such as burrs and fleshy defects in the sand core 12, increase the labor intensity of workers for core repair, and even cause the sand core 12 to be scrapped

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