MANUFACTURING METHOD OF METAL PIPE, AND DEVICE THEREFOR

• Main Authors: NAKATSUCHI NOBUYUKI, KAWAGUCHI HIDEAKI, TAKAHASHI HIROYUKI
• Format: Patent
• Language: English; Japanese
• Published: 24.05.2018
• Subjects: MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; PERFORMING OPERATIONS; PUNCHING METAL; TRANSPORTING; WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL

PROBLEM TO BE SOLVED: To manufacture a metal pipe 1 having a straight part having a fixed pipe diameter, and a cone-shaped part successive thereto, from a metallic plate 5 having a straight part formation part, and a cone-shaped part formation part successive thereto.SOLUTION: A U-shaped metallic plate 22 is obtained from a metallic plate 5 by U-bending. An inward falling part 32 in which a prescribed range including a boundary between a straight part formation part and a cone-shaped part formation part is bent inward is formed on each facing side wall 28 of the U-shaped metallic plate 22. Thereafter, the U-shaped metallic plate 22 is O-bent by a pair of split patterns each having an arc-shaped molding surface, to thereby obtain a metal pipe 1.SELECTED DRAWING: Figure 4 【課題】管径が一定のストレート部とこれに続くコーン状部を有する金属管１を、ストレート部形成部とこれに続くコーン状部形成部を有する金属平板５から製造する。【解決手段】金属平板５からＵ曲げ成形によってＵ字状金属板２２を得る。このＵ字状金属板２２の相対する側壁２８各々に、ストレート部形成部とコーン状部形成部との境界部を含む所定範囲が内側に倒れた内倒れ部３２を形成する。しかる後、円弧状成形面を有する一対の割型でＵ字状金属板２２をＯ曲げ成形することによって金属管１を得る。【選択図】図４