Mold Design Method and Mold

Abstract

In the present invention, not only the deformation amount from the start of solidification of the casting to the end of cooling is obtained by the deformation analysis software (23), but also the deformation amount of the casting mold from pouring to the start of solidification is obtained by the deformation analysis software (22). . The shape of the cavity is designed based on the calculated deformation of the mold and the casting, thereby reflecting the cavity shape of the mold at the beginning of solidification on the design of the mold, thereby further improving the accuracy of the near-net shape, and preventing post-casting The finished castings are undersized.

Description

technical field [0001] The present invention relates to a casting mold design method and a casting mold for designing a cavity shape of a casting mold. Background technique [0002] Casting molds for castings generally use sand molds. When casting castings with complicated shapes, etc., the casting mold may consist of a main mold body and a mold core. Silica sand is often used as molding sand to form a sand mold, and a binder such as resin is usually kneaded in order to improve mold fabrication. [0003] In the casting industry, in order to reduce the machining allowance of the casting after casting, the so-called near net shape (near net shape) that makes the shape of the cast casting product close to the final product shape is promoted. In such near-net-shape casting, the cavity shape of the mold is designed in anticipation of the amount of thermal shrinkage of the casting called scale. For example, when the casting material is gray cast iron and spheroidal graphite cas...

AI Technical Summary

Problems solved by technology

However, it is assumed that in the casting process, the mold is thermally deformed from pouring to the start of solidification due to the high-temperature molten metal, and the shape of the cavity of the mold at the start of solidification changes due to the thermal deformation.

Therefore, only the shrinkage and thermal deformation of the casting are considered, which has the problem that the design accuracy of the cavity shape cannot be sufficiently ensured

In addition, since it is expected that the thermal deformation of the mold caused by the molten metal will shrink the cavity, the machining allowance of the finished casting after casting may be insufficient, and defective products with insufficient dimensions may occur.

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