naa a22 4500 51082210X CHVBK 20180411083538.0 cr unu---uuuuu 180411e20130601xx s 000 0 eng 10.1007/s12541-013-0127-6 doi (NATIONALLICENCE)springer-10.1007/s12541-013-0127-6 Suppressing method of the cross section deformation for extruded square tubes in press bending [Elektronische Daten] [Kunito Nakajima, Noah Utsumi, Masashi Yoshida] Aluminum alloys are widely used in the automotive industry to realize weight reductions. Extruded square tubes made from aluminum alloys show superior workability, and therefore, they are used as lightweight structural elements in various fields. To use such tubes in automobile parts, fabrication processes such as bending are necessary. However, bending can easily cause undesirable distortions such as thickness deviation and flattening. Generally, the use of a mandrel is considered to suppress these distortions effectively. However, studies have not yet established a bending technology for achieving highly accurate cross sections. This study aims to develop a press bending technology for obtaining tubes with highly accurate cross sections. First, we designed and developed a restraint jig for use in this bending process. A laminated mandrel was applied to the inside of the square tube and a constraint load was applied to the restraint plate on the outside to suppress cross-sectional deformation. The effect of the use of a mandrel and restraint plate on the bending of a square tube was experimentally investigated. Furthermore, the press bending process was analyzed through simulations using the finite element method (FEM). Korean Society for Precision Engineering and Springer-Verlag Berlin Heidelberg, 2013 Press bending nationallicence Forming property nationallicence Aluminum alloy nationallicence Extruded square tubes nationallicence FEM nationallicence H0 : Outer height of workpiece (mm) nationallicence h0 : Inner height of workpiece (mm) nationallicence W0 : Outer width of workpiece (mm) nationallicence w0 : Inner width of workpiece (mm) nationallicence t0 : Thickness of workpiece (mm) nationallicence L0 : Length of workpiece (mm) nationallicence Rp : Punch radius (mm) nationallicence Rd : Die radius (mm) nationallicence Od : Die opening (mm) nationallicence CLh : Clearance of height (mm) nationallicence CLw : Clearance of width (mm) nationallicence P : External force by spring (N) nationallicence A : Contact area of workpiece and restraint plate (mm2) nationallicence T : Restraint load factor nationallicence PT : Circumferential force of tension side nationallicence PC : Circumferential force of compression side nationallicence PTN : Flattening component of tension side nationallicence PCN : Flattening component of compression side nationallicence Nakajima Kunito Saitama University, 255 Shimo-Okubo, Sakura, 338-8570, Saitama, Japan aut Utsumi Noah Saitama University, 255 Shimo-Okubo, Sakura, 338-8570, Saitama, Japan aut Yoshida Masashi Shizuoka Institute of Science and Technology, 2200-2 Toyosawa, Fukuroi, 437-8555, Shizuoka, Japan aut International Journal of Precision Engineering and Manufacturing Korean Society for Precision Engineering 14/6(2013-06-01), 965-970 2234-7593 14:6<965 2013 14 12541 https://doi.org/10.1007/s12541-013-0127-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12541-013-0127-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Nakajima Kunito Saitama University, 255 Shimo-Okubo, Sakura, 338-8570, Saitama, Japan aut NATIONALLICENCE 700 1- Utsumi Noah Saitama University, 255 Shimo-Okubo, Sakura, 338-8570, Saitama, Japan aut NATIONALLICENCE 700 1- Yoshida Masashi Shizuoka Institute of Science and Technology, 2200-2 Toyosawa, Fukuroi, 437-8555, Shizuoka, Japan aut NATIONALLICENCE 773 0- International Journal of Precision Engineering and Manufacturing Korean Society for Precision Engineering 14/6(2013-06-01), 965-970 2234-7593 14:6<965 2013 14 12541 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer