Metal deforming – Process – Tube making or reshaping
Patent
1986-06-02
1987-06-30
Larson, Lowell A.
Metal deforming
Process
Tube making or reshaping
291593, B21D 5326
Patent
active
046760890
ABSTRACT:
A central hub for a rotatable tool which can be easily (a) mounted on a polygonal seat at one end of a rotatable mandrel for rotation of the tool with the mandrel and (b) subsequently removed with the tool from the seat of the mandrel. A central opening extending through the hub has a complex shape which includes a plurality of corners and a plurality of concave arcuate lines connecting the corners. The hub can be formed from a ductile preform having a generally cylindrical central opening extending through it by forcing, through the cylindrical opening in the preform, a polygonal punch having, in cross-section, substantially the same shape as, and a slightly larger size than, the polygonal cross-section of the seat of the mandrel which is to be inserted in the central opening in the hub of the tool.
REFERENCES:
patent: 1331156 (1920-02-01), Johnston et al.
patent: 1725592 (1929-08-01), Mertes
patent: 1840039 (1932-01-01), Joyce
patent: 2119334 (1938-05-01), Leffler
patent: 2406553 (1946-08-01), Mader
patent: 2464323 (1949-03-01), Lee
patent: 2892646 (1959-06-01), Doble
patent: 3884066 (1975-05-01), Willmon
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