Sand core fastening method

Abstract

The invention discloses a sand core fastening method. The fastening method is used for fastening a to-be-fastened sand core on a pedestal sand core. The method comprises the steps of, firstly, opening a vertically arranged first screw base hole on the to-be-fastened sand core; secondly, opening a vertically arranged second screw base hole and a sand discharging core hole on the pedestal sand core, wherein the side surface of the second screw base holes and the side surface of the sand discharging core hole are crossed and communicated; and finally, screwing screws in the first screw base hole and the second screw base hole and fixing the to-be-fastened sand core with the pedestal sand core together. The second screw base holes and the sand discharging core hole with the side surfaces crossed and communicated are opened on the pedestal sand core, so that residual sand produced in a fastening process of the screws can be stored in the sand discharging core hole, thereby effectively preventing collapse of the sand core surface and pseudo screw loose of the screws which are caused by the residual sand pressing the sand core surface contacting with screw threads.

Description

technical field [0001] The invention relates to the field of casting, in particular to a sand core fastening method. Background technique [0002] The fastening methods for sand core assembly on the existing casting production line mainly include: adhesive / hot melt adhesive bonding and screw fastening. [0003] At present, the domestic advanced casting production line, the production rhythm is above 60 types / h. Among them, the fastening method of viscose or hot melt adhesive, viscose or hot melt adhesive does not have enough time to fasten the sand core, can not meet the needs of high-speed production rhythm, and in the process of pouring molten iron, under the action of high temperature molten iron It is easy to lead to the failure of the gluing of the sand core assembly, resulting in quality problems such as deviation and floating of the sand core assembly, especially some vertical sand core assembly adhesives or hot melt adhesives cannot be applied at all. [0004] In o...

AI Technical Summary

Problems solved by technology

In the screw fastening method, during the tightening process, since the screw is directly screwed in the screw base hole with a fastening sand core, the material of the sand core makes the residual sand generated by screw screwing easy to squeeze the sand core in contact with the screw thread. The surface of the sand core will be crushed and collapsed, resulting in false sliding of the screw; thus greatly reducing the success rate and reliability of sand core fastening, increasing the material loss caused by sand core scrapping and making it difficult to ensure the dimensional accuracy of the casting

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