DEVICE AND METHOD FOR MANUFACTURING END-THICKENED STEEL PIPE

摘要

PROBLEM TO BE SOLVED: To make it possible to easily form an end-thickened steel pipe of which a wall thickness of an end is further increased than that of a blank steel pipe.SOLUTION: A device for manufacturing an end-thickened steep pipe 5, which is equipped with a metal mold 2 and an axis-pushing punch 3. The metal mold 2 has a non-thickened part 2a and a thickened part 2b. The axis-pushing punch 3 has a main body 3a and a core grid 3b. A blank steel pipe 4 is fixed relatively to the metal mold 2. A length of a core grid 3 in an axial direction of the blank steel pipe 4 is longer than a length of the thickened part 2b in an axial direction, and an outer diameter of the core grid 3 is smaller than an inner diameter of the blank steel pipe 4.SELECTED DRAWING: Figure 1