Development of Manufacturability Verification System for Assisting Mold Design

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  • 金型設計における機械加工検証システムの開発（第一報）
  • カナガタ セッケイ ニ オケル キカイ カコウ ケンショウ システム ノ カイハツ ダイ1ポウ イモノ ケイジョウ ゴサ オ コウリョ シタ カコウ コンナン ケイジョウ ノ ケンシュツ
  • - Detection of Unmanufacturable Form Features with Casting Shape Errors -
  • －鋳物形状誤差を考慮した加工困難形状の検出－

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Abstract

In designing a holder part of a large stamping die, designers must consider not only the functional property of the holder, but also its manufacturability. The holder part is produced by cutting and engraving table, wall, slot and pocket features into the raw cast shape. Raw cast shape has inevitable large shape errors. It often has 5 to 10mm shape difference from the CAD model prepared in the designing phase. This shape difference causes some unmanufacturable features which is difficult to detect with a CAD model of the nominal shape. In this paper, the authors propose a new manufacturability verification system which can detect such unmanufacturable features caused by the shape errors. Proposed system computes a geometric model of the holder part with shape errors by modifying the CAD model. Inverted offsetting and cutting simulation are successively applied to the model to extract the unmanufacturable features. An experimental system is implemented and some computational experiments are performed.

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