PRODUCTION OF POLY V-PULLEY BY SHEET METAL

摘要

PURPOSE:To improve the finishing accuracy of poly V-grooves and to fall into dispase the beveling by the external surface of the peripheral wall of a cup-like material like a sectional waveform, compressing the external surface to the axial direction to finish the recessed parts and then forming a lug part on the edged part of the leading end of the material. CONSTITUTION:A preliminary lug part is formed on the edged parts of both the sides of the peripheral wall part of the cup-like material and the peripheral wall parts 4 is waved by a waveforming roll to alternately forms the projected parts 8 and the recessed parts. The peripheral wall part 4 is compressed to the axial direction. Each recessed part of the peripheral wall part 4 is formed to a prescribed poly V-groove 10 by rolling work using a finishing roll 42. Simultaneously the leading edge part 4c of the material is put between the prljected part 41c of the external circumferential surface 41b of the lower rotation supporting and a circumferential groove part 42f on the circumferential surface 42w of a finishing roll 42 and the end surface 4a''' of the leading edge part 4c is impacted to a stopping stage surface 42g formed on the external cercumferential surface of a lower rotary supporting mold 41 continuously from a peripheral groove part 42f to obtain a sheet metal poly V-pulley provided with lug parts 6, 7.