PURPOSE: To produce a small-diameter wire rod having no surface flaws by passing the wire rod first at a low speed to a tandem rolling mill group disposed with plural caliber rolls around the pass line and coiling the front end part on a coiler, then rolling the wire rod at a high speed.
CONSTITUTION: The tandem rolling mill group 5 disposed with the plural caliber rolls 11W14 around the pass line to form a circular caliber 17 is provided and the coiler 6 is disposed to the outlet side of the rolling mill group 5. The wire rod W guided from an un-coiler 1 to an inlet guide 2 is heated to a prescribed temp. in a high-frequency heating furnace 3. The heated wire rod W is passed through the rolling mill group 5 first at the low speed and the front end part thereof is coiled on the coiler 6. A motor 4 and the coiler 6 are then operated at the high speed to roll the wire rod W and to coil the same with the coiler 6. The good-quality small-diameter wire rod having no surface flaws is thereby produced with high production efficiency.
KURODA KOICHI
HAYASHI CHIHIRO
| JPS54133465A | 1979-10-17 | |||
| JPS58303A | 1983-01-05 | |||
| JPS5415020A | 1979-02-03 |