Metal deforming – By use of tool acting during relative rotation between tool... – With cutting of work or product
Patent
1982-09-17
1983-11-01
Larson, Lowell A.
Metal deforming
By use of tool acting during relative rotation between tool...
With cutting of work or product
72325, 72340, 408 1R, 29157T, B21D 2100, B21D 5300, B23B 3500
Patent
active
044124414
ABSTRACT:
A method useful for forming in a curved surface, an enlarged hole surrounded by an upturned flange whose unattached edge lies substantially in a common plane, uses a drill rod, a set of bits, and a mechanism for forming an upturned flange. A first bit attached to the lower end of the rod forms an initial hole. A second bit, spaced axially along the rod, forms a widened oval hole with tapered sides upon continued axial and rotary movement of the rod relative to the workpiece. A flange forming mechanism is then extended beneath the edge region of the hole and pulled through the hole while rotating, to form the upturned flange. A third bit mounted peripherally with respect to the second bit is used to smooth and level the flange edge and to provide it with a desired shape.
REFERENCES:
patent: 3151657 (1964-10-01), Beranek
patent: 3711214 (1973-01-01), Cloutier
patent: 3910094 (1975-10-01), Luttgert et al.
patent: 4083219 (1978-04-01), Combes
patent: 4248555 (1981-02-01), Satou
patent: 4307593 (1981-12-01), Riggs
G. A. Serlachius Oy
Larson Lowell A.
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