| 摘要 |
A compact and lightweight machine for accurately and quietly shaping the peripheral contour of radially extending projectile fins in a single operation. The machine die arrangement includes a group of arcuate inwardly facing cutting surfaces formed on circumferentially spaced segmental members that are secured to an annular ring which is circumferentially reciprocated in a die baseplate annular recess by a pair of fluid work cylinders. Corresponding work support members secured to the baseplate have external surfaces mating with respective circumferentially reciprocable, segmental member cutting surfaces. After a finned workpiece is positioned on the work support within the die, depending guide members on an air cylinder operated positioning mechanism piston descend into corresponding vertical apertures provided in the work support members prior to the fin-shaping operation performed by the cutting surfaces.
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