| 摘要 |
<p>The purpose of the present invention is to provide a low-cost method for forming a pulley for a belt type CVT such that, by molding a conical belt sliding surface part and a cylindrical shaft part as a unit from raw materials, problems with residual stress, strain, and defects accompanying welding are eliminated and high strength, uniformity, and reduced weight are provided. A disk shaped raw material (W0) is cleaved using a cleaving roller (R1) to a position corresponding to the outer peripheral surface of a shaft part (22) from the outer peripheral surface thereof toward the center part while rotating the raw material (W0). One side (W1b) of the cleaved raw material (W1) is compressed and reduced in diameter using a forming roller (R2). Furthermore, ironing forming is performed on a cylindrical shaft part (W2b) formed using the forming roller (R2) by using an ironing roller (R3) while pressing against a mold (D2), thereby forming a cylindrical shaft part (W3b). Also, ironing forming is performed on the other side (W1a) of the cleaved raw material (W1) by using an ironing roller (R4) while pressing onto a mold (D1), thereby forming a conical belt sliding surface part (W4a).</p> |
