PURPOSE: To enable production of a titled pipe with good productivity by forming ruggedness on the surface of a rolling roll during rolling or no-load operation by means of a blade provided in a roll housing of a skew rolling mill and a feeder thereof thereby enabling stable rolling.
CONSTITUTION: A feeder 10 is provided in a housing 9 which contains a cradle 5 and holds a skew rolling roll 1 holding a cylinder 7 for driving a rack 6. A tool rest 11 is fixed in the feeder 10 and a knurling roll 12 for knurling the surface of the roll 1 for a drum-shaped piercer is mounted to the front end of the rest 11. The data relating to the outside diameter and inclination angle of the roll 1 is inputted to the feeder 10 and the track to be cut of the roll 12 is determined in accordance with the data. The feeder 10 forms moderate ruggedness on the surface of the roll 1 by means of the roll 12 during skew rolling or no-load operation thereby enabling stable rolling.
NAGASAKU SHIGEO