METHOD FOR MANUFACTURING PIPE MATERIAL AND MANDREL

• Main Authors: YASUI TOYOAKI, KIYOTA YOSHIHIRO, KAWAMOTO HIROSHI, SANO YOICHI
• Format: Patent
• Language: English; Japanese
• Published: 18.01.2018
• 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 provide a method for manufacturing a pipe material that shortens the whole processing time while reducing resistance between a workpiece and a mandrel in bending processing, and to provide a mandrel.SOLUTION: A method for manufacturing a pipe material includes: a step of inserting a mandrel 2 including a flow passage 4 for circulating dry ice powder 3 therein and a jetting hole 7 for jetting the dry ice powder 3 at the tip thereof into a pipe material 1; a step of jetting the dry ice powder 3 into the pipe material 1 from the jetting hole 7; and a step of bending the pipe material 1 into which the mandrel 2 is inserted.SELECTED DRAWING: Figure 1 【課題】曲げ加工時に被加工部材とマンドレルとの抵抗を低減しつつ、全体の加工時間を短縮する管材の製造方法およびマンドレルを提供することを目的とする。【解決手段】内部にドライアイスパウダー３を流通させる流路４と、先端に前記ドライアイスパウダー３を噴射する噴射穴７とを備えているマンドレル２を、管材１の内部に挿入するステップと、管材１の内部に噴射穴７からドライアイスパウダー３を噴射するステップと、マンドレル２が挿入された管材１に対し曲げ加工を行うステップを有している。【選択図】図１