Precoated sand mold for door bolt

Abstract

The invention provides a precoated sand mold for a door bolt. The mold comprises a male mold and a female mold. A male mold molding cavity and a female mold molding cavity are formed in the upper surface of the male mold and the upper surface of the female mold respectively. A sand shell molding cavity is formed after mold closing is conducted on the male mold molding cavity and the female mold molding cavity. Two lines of equidistant embossments are arranged on the male mold molding cavity and the female mold molding cavity correspondingly. Structures of the embossments are of the same shapewith the hemisphere side of the door bolt. Partition embossments are also arranged between every two embossments of each line. The upper surfaces of the partition embossments are flush with the uppersurface of the female mold and the upper surface of the male mold. An installing position for a pouring channel is also arranged between every two lines of embossments. The precoated sand mold for thedoor bolt has the beneficial effects that reasonable molding cavities, the pouring channel and a sand-ejecting port are arranged; finished product rate of sand shells can be improved; and finished product rate of door bolts when molten iron is poured can be improved.

Description

technical field [0001] The invention relates to the field of hot core box manufacturing, in particular to a door bolt coated sand mold. Background technique [0002] In daily life, door bolts are widely used. The structure of door bolts is not complicated. Door bolts are generally manufactured by welding or processing on machine tools. Using such manufacturing methods makes the manufacturing cost of door bolts relatively high, and The appearance and mechanical strength of the manufactured door bolt are relatively low, so the present invention designs a hot core box for door bolt casting. [0003] At present, my country's foundry industry generally uses hot core boxes to manufacture sand shells for Unicom joints. The production process is roughly as follows: the sand material mixed with foundry sand, thermosetting resin and catalyst is injected into the core box with a heating device through a core shooter, and heated to 250 to 320 degrees Celsius to make the sand material c...

AI Technical Summary

Problems solved by technology

[0002] In daily life, door bolts are widely used. The structure of door bolts is not complicated. Door bolts are generally manufactured by welding or processing on machine tools. This kind of manufacturing method makes the manufacturing cost of door bolts relatively high, and The appearance and mechanical strength of the manufactured bolts are low, so the present invention designs a hot core box for bolt casting

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