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Article | REF: AM5215 V1

Composite machining

Author: Alain DESSARTHE

Publication date: October 10, 1997

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2. Chip removal machining

The term "chip removal" is inappropriate in the case of composites, where machining produces powder rather than chips.

2.1 Shearing, punching

Shearing and punching, or die-cutting, are applicable to thin-gauge composite materials (up to 2.5 mm). The cutting tool must be particularly sharp. Use a vertically-descending guillotine-type shear with a treated steel upper blade having a cutting gradient of approximately 0.7% in relation to the lower blade, with clearance set to a minimum. Erta (Tufnol brand) recommends a tool slope of 2% for shearing sheets up to 2.5 mm.

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