| 摘要 |
PURPOSE:To provide a titled device which works a thin-walled and long-sized pipe to various diametral sizes with good accuracy by changing the relative positions of collet-shaped split dies inserted and disposed onto a tapered mandrel to attain a prescribed outside diameter and pressing the cylindrical blank material inserted therein by a pressing jig. CONSTITUTION:Collet-shaped split dies 13 having an internally tapered head part are inserted into a tapered mandrel 12 and the relative positions thereof are changed to adjust the outside diameter in the head part of the dies 13 to a prescribed diametral size. A cylindrical blank material 17 inserted onto such dies is pressed by a pressing jig 16 while the material 17 is rotated. The material 17 is formed into a thin-walled and long-sized pipe having a prescribed inside diameter. Said pipe has good dimensional accuracy. Cylinders of various sizes are worked with the same dies 13 and the equipment is made inexpensive. |
