SU50783A1 - Method of making shaped parts from stone casting with holes of small diameter - Google Patents

Description

Tipi making various products from molded basalt, diabase, etc., there is a need to obtain openings of any diameter in these products (for example, in tips for sandblasting machines,; 5 mn for pencil factories, 3 centrifugal pumps for acids and so on), for which cooTBeTCTByrouuie rods are inserted into the molds. The work of the core in the casting of diabase is extremely difficult under the conditions of: -; and mi: the made and dried core must withstand heat up to 700 without deforming. Therefore, the core must be sufficiently strong at these temperatures of the 5th condition; the rod should not sag under the influence of its own weight, but at the same time it should be so soft that it is easy to knock out in a hot state of the product, if the product is released from the rod before its methodological cooling, and should not prevent shrinkage of the product when cooled, as a too hard core tears the casting to pieces. Finally, the rod must have refractoriness (approximately

to 1250) n must be easily disassembled to ensure sufficient purity of the channel. To achieve the above objectives, rods made of quartz sand with kaolin or with cement were previously fused with the body of the product or were torn to pieces, because they were too strong.

In the proposed method, the rods are made of graphite (70-90%), replaced with a refractory core or kaolin (30-100%).

The dry mixture of the indicated varieties is thoroughly mixed, moistened until it can be molded, thoroughly rinsed to remove the air bubbles included in the mass, and then molded by the usual method, dried several times in air and placed in a mold for final drying and calcining.

After termination of the process, or even after its methodological cooling in a tunnel kiln, the rod of this composition is extremely easily destroyed, giving a sufficiently clean channel surface.

To obtain a stone casting product with small holes