Forming mechanism and characteristics of a process for equal-thickness in-plane ring roll-bending of a metal strip by twin conical rolls》.pdfVIP

Journal of Materials Processing Technology 227 (2016) 288–307 Contents lists available at ScienceDirect Journal of Materials Processing Technology j o u rn al h omepage: w w w. elsev /locate/jmat protec Forming mechanism and characteristics of a process for equal-thickness in-plane ring roll-bending of a metal strip by twin conical rolls Hong-wei Li a,∗ , Guang-yi Ren a , Zhi-jun Li b , Lu Feng a , He Yang a,∗ a State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, PR China b Xi’an Aerospace Propulsion Institute, Xi’an 710100, PR China a r t i c l e i n f o a b s t r a c t Article history: A flexible and precise forming technology for low-cost, high-efficient and high-quality manufacture of Received 30 April 2015 equal-thickness rings is urgently required. To this end, a novel technique for equal-thickness in-plane ring Received in revised form 18 August 2015 roll-bending of a metal strip (ET-IRS) by twin conical rolls is presented. In this process, the twin conical Accepted 1 September 2015 rolls are placed to form an equal-thickness roll gap. The rolls rotate in opposite directions with identical Available online 3 September 2015 angular velocity. The strip is bitten into the roll gap by frictional force and compressed equally across its width. Under the varying boundary conditions supported by the varying tangential velocity (VTV) of Keywords: