ELECTROMAGNETIC MOLDING COIL AND MANUFACTURING METHOD FOR AUTOMOBILE BUMPER STAY USING THE SAME

• Main Authors: ISHITOBI HIDEKI, HOSOI HIROAKI, SHIMOAKA SHINGO, HASHIMOTO SEIICHI
• Format: Patent
• Language: English; Japanese
• Published: 12.01.2017
• Subjects: MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; PERFORMING OPERATIONS; PUNCHING METAL; TRANSPORTING; VEHICLES IN GENERAL; VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISEPROVIDED FOR; WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL

PROBLEM TO BE SOLVED: To provide an electromagnetic molding coil having a sufficient durability which enables metallic element pipes of nearly elliptical cross-sectional shape and nearly rectangular cross-sectional shape to be molded by pipe expansion and pipe shrinkage, respectively, and a manufacturing method for an automobile bumper stay using the same.SOLUTION: An electromagnetic molding coil 14 with an elliptical cylinder shape, which has a winding part 13 consisting of a conductor element wire 11 with a quadrangular cross-sectional shape spirally wound around the axis of the electromagnetic molding coil 14, is characterized in that the cross-sectional shape of the winding part 13 in an axially orthogonal shape is nearly elliptic cylinder, and in that dimensions of these elliptical cylinder shapes comprise a major axis of a(mm) and a minor axis of b(mm) to make the plan view thickness t(mm) of the conductor element wire 11 satisfy a predetermined expression.SELECTED DRAWING: Figure 1 【課題】本発明は、略楕円断面形状および略矩形断面形状の金属製素管をそれぞれ拡管および縮管成形できる、十分な耐久性を有した電磁成形コイル並びにこれを用いた自動車用バンパーステイの製造方法を提供することを目的とする。【解決手段】楕円柱形状の電磁成形コイル１４であって、巻線部１３は、断面形状が四角形状の導体素線１１が電磁成形コイル１４の軸のまわりを螺旋状に巻かれたものであり、巻線部１３の軸直交方向の断面形状は、略楕円形状であり、これらの略楕円形状の寸法は、長径がa１（ｍｍ）、短径がｂ１（ｍｍ）をなし、導体素線１１の平面視厚さｔ１（ｍｍ）は、所定の式を満足することを特徴とする。【選択図】図１