PROCESSING METHOD FOR CYLINDRICAL MEMBER, PROCESSING APPARATUS FOR CYLINDRICAL MEMBER, CYLINDRICAL MEMBER AND TANK

• Main Authors: MOGI HIROMICHI, OKA KOHEI, MONOTANE TAKESHI, GOTO KENJI, HISHINUMA SHIZUYUKI
• Format: Patent
• Language: English; Japanese
• Published: 23.09.2016
• 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 cylindrical member which improves the yield of materials and has a long lifetime by correcting a circumferential path length and a circularity in a vicinity of an opening end of a cylindrical member which constitutes a thin-walled tank.SOLUTION: A plastic compressive deformation of a cylinder in the plate thickness direction is converted into a circumferential plastic elongation deformation by loading compressive force in the plate thickness direction along the circumference of a cylindrical member 103 in a vicinity of an opening end of the cylindrical member, so that the opening end of the cylindrical member is processed. For this purpose, a lining mechanism 304 that grips the interior of the cylindrical member 103, an inner jig 302 that nearly comes in contact with the inner face of the cylindrical member 103, and a roller 301 that comes in contact with the outer face of the cylindrical member are provided to clamp a vicinity of the opening end of the cylindrical member 103 with the roller 301 and the inner jig 302, thereby loading a predetermined compressive force in the plate thickness direction of the cylindrical member.SELECTED DRAWING: Figure 8 【課題】薄肉タンクを構成する円筒状部材の開口端部近傍の周方向の経路長と真円度を矯正することにより、材料の歩留まりを向上するとともに長寿命の円筒状部材を得る。【解決手段】円筒状部材１０３の開口端部近傍で円筒状部材の周に沿って板厚方向に圧縮力を負荷することによって、円筒の板厚方向の塑性圧縮変形を周方向の塑性伸び変形に変換し、円筒状部材の開口端部を加工する。そのため、円筒状部材１０３の内部を把持する内張り機構３０４と、円筒状部材１０３の内面にほぼ接する内治具３０２と、円筒状部材の外面に接するローラ３０１とを設け、円筒状部材１０３の開口端部近傍をローラ３０１と内治具３０２とで挟み、円筒状部材の板厚方向に所定の圧縮力を負荷させるようにした。【選択図】図８