B - Operations – Transporting – 21 – D
Patent
B - Operations, Transporting
21
D
26/174
B21D 53/26 (2006.01)
Patent
CA 1230471
Abstract of the Disclosure A method of manufacturing precise sheet metal made poly-v pulleys with poly-V grooves, being uniform in thickness of peripheral wall and free of reduction of mechanical strength, by a step of preliminarily forming a lug in the peripheral wall of a cup-shaped blank and thickening said peripheral wall, a step of forming a plurality of V-grooves in a multiple arrangement on this thickened peripheral wall by pressing from both sides with a V-groove preliminary forming roller possessing a plurality of V-groove forming ridges and a rotary inner die possessing a plurality of V-grooves while rotating the cup-shaped blank, and a step of pressing this peri- pheral wall with a plurality of V-grooves with a finish- ing roller. Furthermore, a method of manufacturing sheet metal made poly-V pulleys having advanced precision, by a step of preliminarily forming lugs and first grooves in the peripheral wall of a cup-shaped blank, and a step of thickening said peripheral wall. - 24 -
475213
Fetherstonhaugh & Co.
Kabushiki Kaisha Kanemitsu
LandOfFree
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