| 摘要 |
PURPOSE:To obtain a ball cage, where the working precision is secured, without increasing the number of working man-hours, by cutting a pipe to a prescribed length after subjecting the circumferential face of the pipe to the turning work and subjecting the cut pipe to the press work. CONSTITUTION:Pipe materials 11 are cut to a prescribed length l after subjecting an outside circumferential face 12 of materials 11 to the turning work. Materials 11 are press-molded by a press device, which is provided with upper and lower molds having a spherical mold face, to project materials 11 to the outside into a shape like a ball, and simultaneously, end faces 13 and 14 are molded to be at right angle with respect to the center line. since the outside face of the pipe 11 where molding is completed is subjected already to the turning work, it is unnecessary to perform the turning work again. Next, an inside circumferential face 16 of the pipe 11 is subjected to the turning work, and both ends faces 31 and 14 are subjected to the chamfering work. By this method, a ball cage is produced with a high working precision with a simple working device. |
