Core box

Abstract

The core box comprises a lower core box, an upper core box, a sand shooting device and a core ejecting device; the upper core box is provided with an upper cavity, the lower core box is provided with a lower cavity, and after the upper core box and the lower core box are closed, the upper cavity and the lower cavity form a molding cavity of a sand core; the sand shooting device comprises a sand shooting plate, a sand shooting nozzle installed at the lower part of the sand shooting plate and a first positioning pin, a step hole is formed in the sand shooting nozzle, the sand shooting nozzle comprises a large step part at the upper end and a small step part connected to the lower end of the large step part, a sand blocking block is installed at the bottom of the large step part and is a big-end-up step cylinder, the diameter of the small step cylinder is greater than that of the small step part of the step hole, and a plurality of notches are uniformly distributed on the periphery of the large step cylinder; the upper end of the step hole is flush with the upper end part of the sand shooting nozzle, and the lower end is flush with the lower end part of the sand shooting nozzle; and the core ejecting device comprises a core ejecting plate, a core ejecting rod arranged at the lower part of the core ejecting plate, and a second positioning pin. A sand shooting rod can be greatly shortened, even no residue exists, manual removal is facilitated, the use amount of precoated sand is reduced, and the sand core cost is reduced.

Description

technical field [0001] The invention relates to a sand core box for producing coated sand cores, which belongs to the field of casting process equipment. Background technique [0002] At present, the production of coated sand cores requires the production of core boxes first, and then the core boxes are connected to the equipment for production. Sand core boxes generally include a complete set of sand shooting devices such as sand shooting boards and sand shooting nozzles. When shooting sand, the equipment blows the granular coated sand into the core box cavity through the nozzle and the sand shooting hole in the mold to form the shape of the sand core. The shot hole in the mold is also filled with sand grains, forming the shot bar. Since the mold has a certain thickness, it will form a longer residual sand shooting rod to stay on the surface of the sand core. After the sand core is out of the mold cavity, it is necessary to manually remove the remaining sand shooting rod...

AI Technical Summary

Problems solved by technology

The thicker the mold, the longer the residual sand shooting rod is generally, the more

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