| 摘要 |
PROBLEM TO BE SOLVED: To provide a drawing method for reducing the occurrence of bend which is caused on a wire rod, a steel bar and steel wire in the case that axially asymmetrical cutting is performed after drawing. SOLUTION: A die satisfying that the half-angleθ( deg.) of the taper angle on the outlet side is 0.01<=θ<=0.5 deg. and the ratio of the length L (mm) of the tapered part on the outlet side to the length E (mm) of a bearing part is 1<=L/E<=10 is used for the final pass of the drawing, working is performed at a working rate satisfying 0.3<=100 1-(d/D)2}<=6 and 0.10D<=E(d/D)2<=0.33 D. Where D is the diameter (mm) of a material to be worked on the inlet side of the die in the final pass of the drawing and d is the diameter (mm) of the material to be worked on the outlet side of the die.
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