| 摘要 |
PURPOSE:To guarantee a product in whole length and to immediately take a proper counterplan, by attaching a device for measuring a drawing load to a die, and detecting internal cracks of a metallic wire rod by the detected load fluctuation. CONSTITUTION:When a metallic wire rod 1 is passed through an internal defect detecting device, a vibration of the rod 1 is prevented by front and rear vibration preventing rollers 2 and 4, which eliminate also the need of recording of load fluctuation caused by said vibration through load cells 6 and 6', and then a recorder 9, for recording a fluctuation of drawing load, indicates only a load fluctuation caused by internal cracks, therefore the detection accuracy is increased. Further, a vibration preventing effect, a back tension effect, and a wedge effect are obtained by providing two dies 5 and 5' to a die device 3, and these effects improve a lubrication in wire drawing thereby improving a life of the die 5'. |
