Metal deforming – By extruding through orifice – Utilizing internal forming means
Patent
1992-09-30
1994-07-05
Larson, Lowell A.
Metal deforming
By extruding through orifice
Utilizing internal forming means
72358, 2989334, B21K 130
Patent
active
053256980
ABSTRACT:
A extrusion die assembly for cold extruding internally and/or externally toothed gears and the like, particularly internally toothed ring gears, with the mandrel for forming the internal teeth in the workpiece including axially successive sets of die teeth, with each set including a full complement of annularly arranged and equally spaced die teeth, and the die teeth from the leading set to the trailing set increasing progressively in diameter.
In one embodiment, the die teeth from one set to the next on the mandrel extrude the gear teeth in equal radial depth, and in a second embodiment, the die teeth of each succeeding mandrel set extrude the gear teeth by displacing an equal volume of material from one set to the next.
The die teeth in each set on the mandrel including a relief portion of progressively decreasing radial dimension, the workpiece being arrested on the die assembly such that all extrusion of the workpiece axially along the mandrel is in the direction of the relief portion, thereby maintaining at a minimum frictional contact between the mandrel and the workpiece.
REFERENCES:
patent: 3186210 (1965-06-01), Lesher et al.
patent: 3608350 (1971-09-01), Yamaguchi
patent: 3910091 (1975-10-01), Samanta
patent: 4287749 (1981-09-01), Bachrach et al.
patent: 4350865 (1982-09-01), Bachrach
patent: 4622842 (1986-11-01), Bachrach et al.
patent: 4878370 (1989-11-01), Fuhrman et al.
Dodds David H.
Fuhrman William J.
Nagpal Vijay
Ford Motor Company
Larson Lowell A.
May Roger L.
McKenzie Frank G.
LandOfFree
Stepped extrusion die assembly does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Stepped extrusion die assembly, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stepped extrusion die assembly will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-789310