Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Patent
1993-11-08
1995-05-23
Larson, Lowell A.
Metal deforming
By use of tool acting during relative rotation between tool...
During rotation of work
72103, B21H 304
Patent
active
054170958
ABSTRACT:
One end of a rotating workpiece is threaded by using a single threading roll having on one end thereof a plurality of annular threading ribs the diameters and/or pitches of which increase slightly and progressively from one end of the plurality to the other. Initially the roll is advanced diagonally toward the end of the work to be threaded until all of the threading ribs on the roll have penetrated the work only part way to the final depth of the desired thread, after which the roll is advanced parallel to the axis of the work for a predetermined distance. The tool is then retracted and the foregoing threading operation is repeated several times, but with the tool holder being advanced a slightly greater radial distance toward the work with each successive threading operation until the desired thread depth has been achieved.
REFERENCES:
patent: 2011761 (1935-08-01), Handel
patent: 2666348 (1954-01-01), Trishman
patent: 3648502 (1972-03-01), Klug et al.
patent: 3972212 (1976-08-01), Brinkman
patent: 4050276 (1977-09-01), Habegger
patent: 4706483 (1987-11-01), Perraudin
C.J. Winter Machine Works, Inc.
Larson Lowell A.
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