| 摘要 |
271,069. Rapide Mecanique Co., Ltd., (Assignees of Barba, A.). May 11, 1926, [Convention date]. Lathes; milling. -- In a machine for making profiled articles, the rotating woik is shaped by means of a profiled tool which has its axis perpendicular to the work axis and is rolled along the work in the direction of the work axis in such a way that the enveloping curve of successive positions of the tool cutting edge gives the required section to the work in the plane of movement of the cutting-edge. The work 5 is held between a chuck 2 driven by a pulley 3 and a back centre 4 mounted in a block 6 over which slides a saddle 7. The saddle is moved longitudinally by means of rack and pinion gearing 8, 9, which is operated through gearing 14, shaft 13, and worm gearing 12. Two similar opposed tools 15, 15<1> having cutting-edges in a plane parallel to the work axis, are mounted on the saddle and are rotated during the longitudinal traverse to produce the ,required profile on the work. In order to ensure approximately correct rolling of the tools on the work notwithstanding the irregular shape of the tool, the tool-spindles 16, 16<1> carry gears 17 - - 19 and 17<1> - - 19<1> respectively, these gears engaging racks 20 - - 22 and 20<1> - - 22<1> which are adjustably spaced along a Z-bar 23 so that different racks come into engagement with their respective pinions to modify the speed of rotation of the tools according to the varying radius of the effective portion of the cutting-edge. The plane PP of the cutting-edge is located at a distance l from the parallel plane containing the work axis in order to obtain the correct cutting-angle d. To manufacture the tools 15, 15<1>, the section of the desired finished work-piece on the cutting plane PP is first determined and a milling-cutter 25 having cutting-edges of the shape thus found is produced. The tool blank 26 is then rolled along the rotating cutter in the same way as the tool is subsequently rolled over the work-piece. Axial feed is imparted to the tool blank after each rolling traverse until the tool is completed. |
