OPERATING METHOD OF PRODUCTION LINE FOR PC STEEL BAR

摘要

PURPOSE:To produce a PC steel bar having prescribed quality at a high yield and with low fuel consumption in one line by controlling the temp. in the other furnace with respect to the line speed of the PC steel bar corresponding to the actual temp. in one furnace of a gas firing hardening furnace and tempering furnace. CONSTITUTION:A hardening furnace 1 and a tempering furnace 2 are respectively constituted of gas firing furnaces in a process for producing a PC steel bar which is continuously operated in one line. The temp. in said furnace 1 is controlled to a prescribed value by adjusting the fuel to be supplied through a fuel pipe 11 to a burner 12 by a furnace thermometer 13 and a setter 14 for calculating furnace temp. and fuel flow. The line speed corresponding to the furnace temp. is calculated by a calculator 15 for the furnace temp. and line speed in accordance with the value measured with said thermometer 13 and the speed of a steel bar material 3 is controlled with a line speed setter 5. The temp. of the furnace is calculated by a calculator 25 for the furnace temp. and line speed with respect to the calculated value of the above-mentioned line speed and the flow rate of the fuel gas to be supplied through a fuel supplying pipe 21 to a burner 22 is adjusted with a thermometer 23, a setter 24 for calculating furnace temp. and fuel flow, by which the furnace temp. is controlled and a steel bar 4 having desired quality is obtd.