Split die for forming grooved workpiece

Details Split die for forming grooved workpiece Split die for forming grooved workpiece

2007-07-03

2007-07-03

Crane, Daniel C (Department: 3725)

Metal deforming

By three or more coacting relatively movable tools

Concurrently actuated tools

C072S402000, C072S370040, C072S370160, C470S010000, C470S029000, C470S084000

Reexamination Certificate

active

10517715

ABSTRACT:
A method of forming a radially expandable externally grooved tubular fastener from metal, comprising the steps of providing a suitable tubular blank (11) having a tubular wall (12) and squeezing the tubular wall between an internal member (17) with a surface which engages the internal tubular wall face (15) of the blank and a plurality of external members (18) provided with suitably shaped surfaces engaging the external tubular wall face (16) of the blank (11) thereby to form grooves (23) on the external tubular wall face (15) of the blank (11).

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