Mold core of hollow cast steel thin-wall bent pipe casting mold with flanges at two ends

Abstract

The invention discloses a mold core of a hollow cast steel thin-wall bent pipe casting mold with flanges at two ends. A small flange is molded at a small-head end of a bent pipe; a large flange is molded at a large-head end of the bent pipe; the mold core comprises a main sand core and a limiting sand core; the outer wall of the main sand core and the inner wall of the bent pipe are arranged in amatching manner; the inner wall of the limiting sand core and the outer wall of the bent pipe are arranged in a matching manner; the limiting sand core sleeves a small-head end of a main sand core; agap between the inner wall of the limiting sand core and the outer wall of the main sand core is equal to a wall thickness of the bent pipe; the main sand core adopts a hollowed film coating sand core; the limiting sand core is molded by compounding organic ester water glass sand and alkaline phenolic resin sand; the end, molded near the small flange, of the limiting sand core is an organic esterwater glass sand layer; and the end, molded far from the small flange, of the limiting sand core is an alkaline phenolic resin sand layer. The mold is simple and reasonable in structure, can effectively prevent cracks on the back surface of the small flange in the casting process, and improves the product machining quality.

Description

technical field [0001] The invention relates to the technical field of casting molds, in particular to a mold core of a hollow cast steel thin-wall elbow casting mold with flanges at both ends. Background technique [0002] Elbows are fittings that change the direction of a pipe. In recent years, with the development of modern technology and the application of new technologies, not only the use of common elbows has increased sharply, but also the demand for various special-shaped elbow fittings has also increased sharply. At present, there is a kind of hollow cast steel thin-walled elbow with flanges at both ends. Its structure includes an elbow body that is set in a shape of reduced diameter from one end to the other end. The small end of the elbow body is provided with a small flange. The big end of the elbow body is provided with a big flange. At present, this kind of hollow cast steel thin-walled elbow with flanges at both ends is mainly formed by casting. However, in...

AI Technical Summary

Problems solved by technology

However, in the prior art, since the core of the hollow cast steel thin-walled elbow casting mold with flanges at both ends is usually a whole sand core made of the same material, the small flange of the elbow will be damaged due to The stress caused by shrinkage cannot be released, making the back of the flange prone to cracks, which affects the processing quality of the product

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