| 摘要 |
PURPOSE:To obtain a cut surface with a high grade while preventing burring and flashing by cutting a high temp. copper billet with a circular saw while cooling only the part thereof to be cut at a limited temp. CONSTITUTION:A sawing device 5 provided with a circular saw 4 with oil holes, a driving device for said saw and a lubricator is imposed on the carriage 2 on a rail 3 laid in parallel with a pass line for a copper billet 1 of a high temp. emerging from a continuous casting machine. The coolant, such as water, cutting oil, refrigerant mist, or the like, supplied from the lubricator is ejected from the oiling holes 6 of the saw 4 to the part of the billet 1 to be cut. The supply rate of the coolant is controlled to a prescribed rate in this state to cool only the part of the copper billet to be cut to 450-550 deg.C, whereby the billet is cut without burring and flashing. The cut part is heated nearly to the original temp. by the heat conduction from the uncut part right after the cutting. There is therefore no need for heating the billet again prior to the succeeding stage. |
