Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Patent
1993-12-23
1995-07-04
Larson, Lowell A.
Metal deforming
By use of tool acting during relative rotation between tool...
During rotation of work
72 85, B21D 2216
Patent
active
054289807
ABSTRACT:
A cap to be fitted around a neck portion of a drink bottle is produced from a cap blank by employing a spinning process. First, the cap blank is fitted around the distal end of a movable guide arranged surrounding a die shaft serving as a spinning mandrel, and thereafter, a spinning operation is performed for the cap member by two rollers adapted to successively come in contact with the cap member. One of the rollers is a rough spinning roller and the other one is a finishing roller which serves to glaze the surface of the cap member. The rollers are positioned offset from each other, not only in the axial direction, but also in the circumferential direction. While the die cap is firmly held between the die shaft and a pressing member of a pressing unit, the die shaft is rotated, causing the cap member and both the rollers to be rotated by the die shaft. Subsequently, the movable guide is axially displaced away from the distal end of the die shaft, and both the rollers are axially displaced in synchronization with the movable guide for performing the spinning operation.
REFERENCES:
patent: 813604 (1906-02-01), Watzke
patent: 3109400 (1963-11-01), Paulton
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