Affiliation:
1. Institute of Metal Research Chinese Academy of Sciences
Abstract
Abstract
Through the optimization of tool parameters and the wedge shape, titanium alloy workpieces with excellent surface and internal qualities were formed by flat cross wedge rolling (CWR) adopting tools without surface grooves. Firstly, the thermomechanical coupled model of CWR for TC11 (Ti-6.5Al-3.5Mo-1.5Zr-0.3Si) titanium alloy was established in the finite element (FE) software DEFORM-3D, and the effects of forming angle α, stretching angle β and section reduction Ψ were studied. The results showed that in the conventional empirical range of tool parameters, the defect-free workpiece is hard to be rolled by the typical tool structure. To optimize the forming quality of rolled workpieces, a modified tool structure was proposed by introducing an inclined plane with a width of λ (2–5 mm) on the top of the wedge shape and revising the side wedge plane α to a combination of two inclined planes α1 and α2 (α ≥ α1 > α2). Simulations and experiments demonstrated that the modified tools without surface grooves can achieve TC11 alloy workpieces with smooth surface. When the distance between the top and bottom tools is too large, the rolled workpiece axis is prone to being bent, and the gap from the top tool to the billet should be controlled in the range of 0-0.2 mm to ensure its straightness. Finally, the necking-free TC11 alloy rolled workpieces (Ψ = 67.9% and Ψ = 82.3%) with smooth surface and excellent internal quality were manufactured by IM500 flat CWR mill at 900°C, 500 mm/s.
Publisher
Research Square Platform LLC
Reference33 articles.
1. Past developments, current applications and trends in the cross wedge rolling process;Fu XP;Int J Mach Tool Manu,1993
2. Development of Cross-Wedge Rolling Theory and Technology;Pater Z;Steel Res Int,2010
3. Research and industrialization of near-net rolling technology used in shaft parts;Hu ZH;Front Mech Eng-Prc,2018
4. Shchukin VY, Kozhevnikova GV, Petrenko VV (2012) Cross-Wedge Rolling at Pti Nas Belarus. Appl Mech Mater 201–202: 1198 – 202. https://doi.org/10.4028/www.scientific.net/AMM.201-202.1198
5. Cross wedge rolling failure mechanisms and industrial application;Li Q;Int J Adv Manuf Tech,2008