A vertical sand-filled, polygonal positioning butterfly valve core box

Abstract

The invention provides a butterfly valve core box with the vertical sand filling and polygon positioning functions. The butterfly valve core box comprises a core box lower half part and core box upper half parts, wherein the cavities of the core box upper half part is of a polygonal structure which is matched with a polygonal outer mold core print, a sand filling port is formed in the top of each core box upper half part, and the two core box upper half parts are in butt joint to form a ring. According to the butterfly valve core box with the vertical sand filling and polygon positioning functions, a core box body and the outer mold core print are designed to be polygonal, the characteristic that the number of the corners of a polygon is large is utilized, and when the box is combined, a sand core can be accurately positioned through the corners; the sand filling port is formed in the top of the core box body, the pattern draft corresponding to the outer mold core print is formed by using a blade through scraping, the compactness of the sand at the root of a flange of the butterfly valve is guaranteed, and the difficulty of manual operation is reduced; and because the flange with the thickness ranging from 20 millimeters to 25 millimeters is arranged in the core box body of the butterfly valve core box and is fixed to the core box lower half part, the core box upper half parts tightly clamp the flange, and the size of the inner groove and the surface quality of the flange of the sand core are guaranteed.

Description

technical field [0001] The invention relates to the technical field of butterfly valve casting molds, in particular to a vertical sand-filled, polygonally positioned butterfly valve core box and a method for making butterfly valve sand cores using the butterfly valve core box. Background technique [0002] At present, in the valve casting industry, in order to obtain high-quality flanged butterfly valve castings, foundry companies generally choose the molding process of placing the butterfly valve body castings in two boxes. This process often requires a sand core to be placed between the two flanges. For most valve foundry enterprises, the core making process generally adopts the traditional manual core making, and when making the butterfly valve body sand core by hand, there are 1) the sand core is not easy to locate accurately; 2) the sand compactness at the corners of the two flanges is not enough, Cause molten steel to sinter and stick sand; ③The sand core is easy to sw...

AI Technical Summary

Problems solved by technology

For most valve foundry enterprises, the core making process generally adopts the traditional manual core making, and when making the butterfly valve body sand core by hand, there are 1) the sand core is not easy to locate accurately; 2) the sand compactness at the corners of the two flanges is not enough, Cause molten steel to sinter and stick sand; ③The sand core is easy to swell, the quality of the sand filling surface of the sand core is poor, and it is easy to cause three situations, such as artificial factors of the gap size of the two flanges that do not meet the requirements of the drawing, resulting in increased difficulty in process operation and subsequent Cleaning is difficult; in severe cases, castings cannot be used due to size problems

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