| 摘要 |
PURPOSE:To work integrally a thick-walled pipe roll which is hardly workable by machining both ends of the pipe material having the wall thickness and outside diameter conforming to the wall thickness and outside diameter of the pipe roll to a small diameter and pressurizing the small diameter parts to required inside and outside diameters. CONSTITUTION:The two ends of the thick-walled pipe 4 having an inside diameter d1, outside diameter d2 and overall length l1 are machined in the range B of the length l3 to have an outside diameter d3. The thin-walled parts at both ends are then drawn to a shaft diameter d4. The range to be drawn to the diameter d4 is not required to be drawn over the entire length of the thin-walled part l3 and may be only the range required for attaching of a bearing 5. If the inside diameter of the bearing 6 is equal to the outside diameter d5 lager than the machined outside diameter d3, a die 7 is manufactured and the work piece machined to the size A is fitted to said die. A high-pressure working fluid is forced into the hollow part of the diameter d1 to bulge the thin-wall part at the end until said part conforms to the inside surface of the die, by which the shaft part having the diameter d5 of obtd. The material 4 or the ambient is heated to facilitate working with some materials. |
