Sand core with built-in pouring gate

Abstract

A sand core with a built-in pouring gate comprises a resin sand core arranged in a sand mold; the pouring gate is arranged in the resin sand core; one end A of the pouring gate arranged in the resin sand core is connected with a runner in the sand mold, the other end B of the pouring gate is connected with a cavity of a malleable cast iron connecting piece, and the section of the pouring gate is arranged in the direction of a pouring gate channel in a variable-section mode; the pouring gate channel is in a curve shape, and the other end B of the pouring gate is located in a to-be-machined inner hole section area M of the cavity of the malleable cast iron connecting piece. Due to the arrangement of the pouring gate of the resin sand core, the defects that the end face of a casting is rough,sand holes exist, residues are easily generated at the pouring gate, stubbles are large and the like in the prior art are overcome, and meanwhile the production efficiency of subsequent machining isimproved.

Description

technical field [0001] The invention relates to a casting gate structure, in particular to a sand core structure provided with a built-in gate. Background technique [0002] At present, the widely used pipe connectors such as pipe clamps, unions, elbows, tees, etc. are basically made of malleable iron castings (malsteel), and the pipe connectors such as elbows, tees, and crosses are mostly hollow castings. Place the sand core, the sand core is usually made of clay or water glass sand core; the gate is usually placed on the end face of the annular mouth of the casting, this casting method is easy to wash out the sand core when the casting is pouring, resulting in a rough surface of the casting , trachoma and other defects, when the casting is separated from the runner, defects such as lack of meat or large stubble are likely to occur at the gate, and subsequent repairs, grinding and other processes are required to become a qualified casting. The production efficiency is low, ...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a sand core structure with a built-in gate, aiming at optimizing the design of a structure suitable for the position of the casting gate of malleable steel pipe fittings, so as to solve the problem of trachoma, loss of meat, and To solve the problem of large stubble, to improve the quality of the end face of the casting and improve the production efficiency

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