| 摘要 |
PURPOSE:To obtain easily a large-sized gear by a plastic working, by heating locally the outside peripheral part of a disk-shaped blank, rotating it by a peripheral pitch angle of a tooth to be formed, and bringing it to a forging successively by a punch whose sectional shape is the same as a gap between adjacent teeth. CONSTITUTION:When a gear manufacturing device is turned on, a high frequency socillator in a control board 6 is started, and an outside peripheral part 1a of a blank 1 is heated locally by a heating coil 8. Its temperature is detected by a two-color thermometer, and when a temperature rises up to a set working temperature, a pulse motor in a rotary device 13 is driven and the blank 1 is rotated in a rotating direction 15 by a set peripheral pitch angle, and the outside peripheral part 1a which has been heated stops right under a punch 2. By driving of a cylinder 3, the punch 2 descends and the first forging is executed. The blank 1 is further rotated by the set peripheral pitch angle and worked by the punch 2, by which a tooth 1b of the first piece is formed. Also, when a tooth of the second piece is formed, the tooth 1b of the first piece is quenched by cooling water 12 from a jet port 10a of a nozzle 10, and a heat treatment of quenching is executed.
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