Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Patent
1994-07-05
1996-05-14
Larson, Lowell A.
Metal deforming
By use of tool acting during relative rotation between tool...
During rotation of work
72469, B21B 2700, B21D 1500, B21H 304
Patent
active
055157084
ABSTRACT:
Four different designs for the teeth of a rolling die are disclosed. A pair of the disclosed dies is used to form helical teeth in a cylindrical rod workpiece. All four of the disclosed die tooth embodiments are variations of a common design feature: Namely, at least one segment of the tooth profile for the first tooth of the start portion of the die is formed with a pressure angle substantially larger than the pressure angle of the final basic profile geometry desired for the teeth, and then the profiles of the successive die teeth for the start portion are formed so that the pressure angle of each successive die tooth progressively and gradually decreases in magnitude from the pressure angle of the first tooth until the pressure angle of the final die tooth of the start section is substantially the same as the pressure angle of the desired workpiece teeth.
REFERENCES:
patent: 859643 (1907-07-01), Cummings
patent: 2011761 (1935-08-01), Handel
patent: 3626733 (1971-12-01), Zook et al.
patent: 3651678 (1972-03-01), Zook et al.
patent: 5182937 (1993-02-01), Dickson
"Roll Forming of Gears at Ford Motor Company", by Leon N. DeVos, Chapter 25, American Gear Manufacturers Association, VA, pp. 335-343.
Butler Rodney
Larson Lowell A.
Zexel Torsen Inc.
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