To provide a method for manufacturing a forge-welded steel tube, capable of remarkably reducing the occurrence frequency of crushing of the front edge of the tube when rotationally straightening a forge-welded steel tube stock.
In the method for manufacturing the forge-welded steel tube, an inlet side guide and an outlet side guide of tapered tube type, the inner diameters of which are tapered at their ends closely to the outer diameter of a forge-welded steel tube stock 5, are installed in the inlet side and the outlet side of a rotary straightening machine respectively to guide the tube stock, for correcting the bending, the outer diameter dimension, and the outer diameter shape of the tube stock by means of the rotary straightening machine. Two or more stages of inlet side guides 1 are installed in series with predetermined interstage distances.
COPYRIGHT: (C)2010,JPO&INPIT
IWASAKI KENICHI
TAKAHASHI KATSUE
AIBA TAMOTSU
