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; accepted 23 June 2014 Abstract: The forming defects, including thinning, rupture, wrinkling and springback, usually arising in producing a side-door impact beam, were investigated by trial... is ameliorated and the springback is eliminated in the aluminum alloy hot stamping. The wrinkling severity decreases with increasing blank holder force (BHF), but the BHF greater than 15 kN causes the rupture......
with the ST and NA alloys, the springback of T6 alloys was markedly larger. The aging time showed a positive sensitivity on the springback and non-uniform bending deformability. The bending characteristics... temperature, accompanying with defects such as springback, cross-section deformation and surface cracking [3-5], which severely restricts the application of aluminum alloys in the automobile body......
and optimizing the process parameters of press bend forming of the integrally stiffened aircraft panels. Based on the in-depth analysis of the mechanics of the bending and springback of the detailed... process consists of multiple times of bending and springback. Implicit algorithm is adopted to achieve higher accuracy and avoid transferring between explicit and implicit algorithms......
Semi-hot Stamping as an Improved Process of Hot StampingMalek Naderi1,Mostafa Ketabchi1,Mahmoud Abbasi1,Wolfgang Bleck21. Department of Mining and Metallurgy,Amirkabir University of Technology2. Department of Ferrous Metallurgy,RWTH-Aachen University摘 要:Reducing the forming load,deletion of springback,increasing the formability of sheets as well......
springback during heavy cold working.关键词:......
, the deformational characteristics of rock are different, and stress-strain curves present two kinds of features: springback or no springback. With the increase of the amount of cyclic impact, the dynamic peak stress......
processes to ensure the quality of large pipe products. The setting round for pipe-end is a local elasto-plasticity deformation process, so it is difficult to quantificationally analyze the springback.... YAN et al [9,10] gave the FEM equivalent model for the bending forming of aircraft integral panel. SU et al [11] researched the springback law in the cap-shape bending process. NATARAJAN......
, reduced bending moment and increased springback ratio. Therefore related parameters should be adjusted accordingly in terms of engineering application. Key words:roller leveling; elastic-plastic...面回弹特性的重要参照量.该量在板条弯曲加工中用于判断截面是否能更好地保持受弯时的形状[1].在辊式矫直过程中也是对条材残留曲率比计算的重要指标.二次反弯过程中回弹比随前次弯曲参数的变化如图7所示. 图7 二次反弯回弹比曲线 Fig.7 Springback ratio curve during the second reverse bending process 由图7可......
and springback. To obtain the rule of the plastic strain to guide the planning of tool path and the design of process parameters during forming, the equivalent model with contour layered......
coupling seepage flow in fractured rock mass was established based on the equivalent continuous medium. The results show that deformation of slope is mainly based on unloading springback during......