Abstract: Due to the elastic deformation of metal stamping, springback is a serious problem to cause shape
deviation and thus reduce precision. The springback behavior of ring-shaped workpiece is investigated in this paper and an auxiliary boss device is proposed to control the springback deformation. A finite element model is developed. The characteristic parameters including boss height, boss angle and boss gap are discussed systematically. It can be concluded that the gap has a positive linear correlation with springback percentage, and the boss angle has an optimal interval of 30°—60° to reduce springback. When the boss height increases, the springback decreases, but the effect weakens when the boss height is larger than 1.0 mm. Then, a response surface analysis is conducted with Design Expert 8.0.5 software and an optimal parameter process window (i.e., boss height from 2.1 to 3.0 mm, boss angle from 53°to 60°and the gap from 0 to 1.2 mm) is obtained. Finally, a set of molds are fabricated and the stamping experiments are conducted. The springback behavior is well controlled. The springback percentage can be decreased from 33% to 6% by using the auxiliary boss device of ring-shaped workpiece.
HE Junyi (何俊艺), WANG He (王贺), PENG Linfa (彭林法),YI Peiyun* (易培云), LAI Xinmin (来新民), LIN Zhongqin (林忠钦)
. Investigation of Springback Behavior and Process Control for Stamping of Ring-Shaped Workpiece[J]. Journal of Shanghai Jiaotong University(Science), 2017
, 22(4)
: 385
-394
.
DOI: 10.1007/s12204-017-1851-3
[1] LOVELL M, HIGGS C F, DESHMUKH P, et al. Increasing formability in sheet metal stamping operations using environmentally friendly lubricants [J].Journal of Materials Processing Technology, 2006,177(1): 87-90.
[2] HU K, ZHANG H L. A springback reduction method for sheet metal bending [C]//2011 International Conference on Mechatronic Science, Electric Engineering and Computer. Jilin: IEEE, 2011: 617-620.
[3] FIRAT M, KAFTANOGLU B, ESER O. Sheet metal forming analyses with an emphasis on the springback deformation [J]. Journal of Materials Processing Technology,2008, 196(1): 135-148.
[4] GNAEUPEL-HEROLD T, FOECKE T, PRASK H J, et al. An investigation of springback stresses in AISI-1010 deep drawn cups [J]. Materials Science and Engineering: A, 2005, 399(1): 26-32.
[5] LING Y E, LEE H P, CHEOK B T. Finite element analysis of springback in L-bending of sheet metal[J]. Journal of Materials Processing Technology, 2005,168(2): 296-302.
[6] CHO J R, MOON S J, MOON Y H, et al. Finite element investigation on spring-back characteristics in sheet metal U-bending process [J]. Journal of Materials Processing Technology, 2003, 141(1): 109-116.
[7] PANTHI S K, RAMAKRISHNAN N, AHMED M, et al. Finite element analysis of sheet metal bending process to predict the springback [J]. Materials and Design,2010, 31(2): 657-662.
[8] LING Y E, LEE H P, CHEOK B T. Finite element analysis of springback in L-bending of sheet metal[J]. Journal of Materials Processing Technology, 2005,168(2): 296-302.
[9] TEKINER Z. An experimental study on the examination of springback of sheet metals with several thicknesses and properties in bending dies [J]. Journal of Materials Processing Technology, 2004, 145(1): 109-117.
[10] WAGONER R H, LIM H, LEE M G. Advanced issues in springback [J]. International Journal of Plasticity,2013, 45: 3-20.
[11] WAGONER R H, GAN W, MAO K M, et al. Design of sheet forming dies for springback compensation[C]//Proceedings of the 6th International ESAFORM Conference. Salerno: European Scientific Association for Material Forming, 2003: 1-3.
[12] LINGBEEK R, HU′ ETINK J, OHNIMUS S, et al. The development of a finite elements based springback compensation tool for sheet metal products [J]. Journal of Materials Processing Technology, 2005, 169(1): 115-125.
[13] KARAFILLIS A P, BOYCE M C. Tooling and binder design for sheet metal forming processes compensating springback error [J]. International Journal of Machine Tools and Manufacture, 1996, 36(4): 503-526.
[14] ANAGNOSTOU E L. Optimized tooling design algorithm for sheet metal forming over reconfigurable compliant tooling [D]. Stony Brook: Mechanical Engineering,State University of New York, 2002.
[15] CHENG H S, CAO J, XIA Z C. An accelerated springback compensation method [J]. International Journal of Mechanical Sciences, 2007, 49(3): 267-279.
[16] GAN W, WAGONER R H. Die design method for sheet springback [J]. International Journal of Mechanical Sciences, 2004, 46(7): 1097-1113.
[17] XIA Z C, REN F. An investigation of wall curl reduction through post-stretch forming [C]//ASME 2004 International Mechanical Engineering Congress and Exposition. Anaheim: American Society of Mechanical Engineers, 2004: 495-502.
[18] LIU Y C. The effect of restraining force on shape deviations in flanged channels [J]. Journal of Engineering Materials and Technology, 1988, 110(4): 389-394.
[19] LIU G, LIN Z, XU W L, et al. Variable blankholder force in U-shaped part forming for eliminating springback error [J]. Journal of Materials Processing Technology,2002, 120(1): 259-264.
[20] LIU Y C. Springback reduction in U-channels:“Double-bend” technique [J]. Journal of Applied Metalworking,1984, 3(2): 148-156.
[21] SHU J S, HUNG C H. Finite element analysis and optimization of springback reduction: The “doublebend”technique [J]. International Journal of Machine Tools and Manufacture, 1996, 36(4): 423-434.
[22] CHOU I N, HUNG C H. Finite element analysis and optimization on springback reduction [J]. International Journal of Machine Tools and Manufacture,1999, 39(3): 517-536.
[23] AOYAMA T, SHIMIZU T, ZHENG Q, et al. Effect of heating on springback in heat assisted microbending[J]. Advanced Materials Research, 2014, 939: 409-414.
[24] MARCOTTE M R. Optimum time and temperature for stress relief heat treatment of stainless steel wire[J]. Journal of Dental Research, 1973, 52(6): 1171-1175.
[25] American Association State Highway and Transportation Officials. Standard test methods for tension testing of metallic materials: E8-04 [S]. West Conshohocken,PA: ASTM International, 2009.
