Sand core of pipe mould

Abstract

The invention relates to a sand core of a pipe mould, and belongs to the technical field of casting. The sand core comprises an inner sand core and an outer sand mould, wherein a cavity is formed between the sand core and the sand mould; the sand core comprises a barrel-shaped water glass sand core outer wall as well as sand blocks and saw dust in a cavity defined by the water glass sand core outer wall; the water glass sand core outer wall adopts an integral structure; the sand mould comprises a plurality of stacked individual sand moulds.

Description

technical field [0001] The invention relates to a pipe mold sand core, which belongs to the technical field of casting. Background technique [0002] The full name of the pipe mold is metal water-cooled ductile iron pipe mold, and the material is mostly low-alloy steel such as 20CrMo, which is used for centrifugal casting to produce ductile iron pipes. The working environment of the pipe mold is relatively harsh, and it must bear the centrifugal force generated by high-speed rotation, the huge torque generated at the start and start, and the repeated water chilling effect. In particular, large-diameter thick-walled pipe molds are used in high-temperature, high-pressure and corrosion conditions, so the requirements for their structure and mechanical properties are relatively high. [0003] The pipe mold is made of water glass sand, which has high strength, poor yield and collapse. Internal core assembly using the traditional process is to divide the internal cylindrical san...

AI Technical Summary

Problems solved by technology

Since the sand core must ensure the integrity of each sand core, the amount of sand consumed by each sand core is relatively large and the internal concession material is less, so the produced sand core has a large resistance to shrinkage, and it is easy to form longitudinal cracks in the pipe mold blank. Moreover, the inner circle formed by the core assembly is easy to deform, resulting in that some parts of the inner circle cannot be processed

Because the water glass sand cleaning is basically manual sand cleaning, the collapsibility is poor and the residual strength is high, the molding sand and the core bone are intertwined, so it is difficult to clean

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