| 摘要 |
PURPOSE:To efficiently produce a high-strength coil spring of a high quality, by comparing and controlling a temperature detecting value and a set temperature condition of a coil spring blank material, and executing a heat treatment under prescribed temperature conditions. CONSTITUTION:A coil spring blank material A is heated quickly by use of a heating mechanism 1a. The temperature of this heated blank material A is detected by a temperature measuring instrument 8, and this temperature value is converted to an electric signal. Subsequently, this signal is inputted to a controller 4, and this signal is compared with a temperature value set in advance and is instructed to a heating mechanism 1a or a cooling mechanism 1b. Subsequently, the spring blank material heated or cooled to a prescribed temperature is coiled by a forming device 10. Thereafter, the formed coil spring A is quenched by a cooling mechanism 16. |
