| 摘要 |
<p>A method of making a dynamically balanced cup-shaped blank for use in the production of a V-grooved pulley, from a flat sheet metal disc by a roller spinning tool. The disc is provided with a central hole for mounting the disc on rotating die means between headstock and tailstock die form assemblies of a spinning machine. The spinning tool presses the disc against an end of a headstock die form and moves generally radially outwardly pressing a portion of the disc against the end of the die form to provide a bottom wall of the desired cup-shaped blank. The spinning tool then moves in a series of passes along the headstock die form thereby rolling, forming and ironing rotating outer metal portions of the disc against the die, and forming the disc with an annular reversely angled conical flange and an axially extending cylindrical side wall which terminates in an open end. The die form and spinning tool also form a reentrant corner in the disc blank which connects the conical flange with the cylindrical wall and which is defined by an acute angle with the cylindrical side wall. The conical flange ultimately forms a portion of one of the flanges of a V-groove in a finished pulley subsequently spun from the cup-shaped stage blank. The open end of the cylindrical side wall ten is trimmed to a predetermined length to provide the desired wall length in which one or more V-grooves will be spun, to form a finished dynamically balanced, spun V-grooved pulley.</p> |
