Exhaust system for rapidly-molding sand core

Abstract

The invention discloses an exhaust system for a rapidly-molding sand core. The rapidly-molding sand core comprises an upper outer mold, a lower outer mold and an overall sand core body; the exhaust system comprises a plurality of sand core exhaust holes, a plurality of first outer mold exhaust holes and at least one second outer mold exhaust hole, wherein the sand core exhaust holes are longitudinally distributed at the bottom of the overall sand core body at intervals; the first outer mold exhaust holes are longitudinally distributed at the bottom of a groove of the lower outer mold at intervals, the number of the first outer mold exhaust holes is the same as the number of the sand core exhaust holes, the positions of the first outer mold exhaust holes correspond to the positions of the sand core exhaust holes, and a first longitudinal exhaust channel of the exhaust system is formed by the first outer mold exhaust holes and the sand core exhaust holes; and the at least one second outer mold exhaust hole is transversely distributed at the bottom of the lower outer mold, at least one end of the second outer mold exhaust hole is led to the exterior of the rapidly-molding sand core, and the second outer mold exhaust hole is communicated with the multiple first outer mold exhaust holes. By means of the exhaust system, the exhaust effect of the sand core is effectively improved, and air holes caused by in-mold suffocation are avoided.

Description

technical field [0001] The invention relates to the field of casting, in particular to an exhaust system for rapid molding sand cores. Background technique [0002] In the process of product development, rapid prototyping sand cores can greatly shorten the development cycle and reduce development costs. The rapid prototyping sand core includes an upper shape, a lower shape and an overall sand core. The upper shape and the lower shape are directly formed by milling sand blocks on a milling machine, and the overall sand core is formed by 3D printing. However, there is no core head on the top surface of the integral sand core, and the exhaust channel cannot be directly drawn from the top surface of the integral sand core, especially the cylinder head that can only be poured by horizontal casting, and the bottom of the 3D printed integral sand core is thick. . Moreover, the overall sand core gasses slowly in the mold cavity during pouring, which results in the inability to dis...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an exhaust system for rapid-forming sand cores, thereby overcoming the defect that existing rapid-forming sand cores are difficult to exhaust

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