Method for forming collared holes

Details Method for forming collared holes Method for forming collared holes

1977-11-03

1979-01-02

Larson, Lowell A.

Metal deforming

By use of tool acting during relative rotation between tool...

With cutting of work or product

72325, 113116UT, B21D 5138

Patent

active

041320972

ABSTRACT:
A method for forming collared holes in a workpiece. The tool has a drill formed at one end thereof for forming a hole in the workpiece. Immediately adjacent and contiguous to the drill is a tapered configured portion which is extendable into the hole formed by the drill. Rotation of the tool causes a collar to form around the hole as the tapered portion of the tool is rotated and forced into the hole. The tool has a constant diametered rod configured portion to straighten and polish the inside surface of the collar formed around the hole in the workpiece. The method of forming the collared hole in a workpiece includes the steps of forming the hole in the workpiece, inserting the tapered tool into the hole so as to contact the tapered tool against the circumference of the hole. The tool is then rotated and the tapered portion is forced further through the hole so as to form the collar integral with the workpiece and surrounding the hole while protruding from opposite sides of the workpiece.

REFERENCES:
patent: 2991551 (1961-07-01), Fogle et al.
patent: 3429171 (1969-02-01), Feher

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