Cold headed center vacuum drill bit

Metal tools and implements – making – Blank or process – Drill

Patent

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Details

175393, 1754201, B21K 502

Patent

active

054526280

ABSTRACT:
A drill bit for drilling holes in a work surface including a hard wear-resistant insert and a metal body including a top working surface of an irregular surface configuration having a slot for retaining the hard wear-resistant insert. The body having a metal grain structure substantially parallel with the contour of the body. In a preferred embodiment the body is formed by cold-heading.

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Metals Handbook, 8th Edision, vol. 4, "Forming" American Society for metal, pp. 465-475.
Metals Handbook, 9th Edition, vol. 14, "Forming and Forging" ASM International, pp. 291-298.

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