Pressas Ioannis S, Papaefthymiou Spyros, Manolakos Dimitrios E
Laboratory of Manufacturing Technology, School of Mechanical Engineering, National Technical University of Athens, 9, Heroon Polytechniou Street, 15780 Athens, Greece.
Laboratory of Physical Metallurgy, Division of Metallurgy and Materials, School of Mining & Metallurgical Engineering, National Technical University of Athens, 9, Heroon Polytechniou Street, 15780 Athens, Greece.
Materials (Basel). 2024 Apr 27;17(9):2055. doi: 10.3390/ma17092055.
Ring Rolling is a near-net manufacturing process with some measurable dimensional inaccuracies in its products. This fact is exaggerated even more under the scope of high-precision manufacturing, where these imprecisions render such products unfitting for the strict dimensional requirements of high-precision applications (e.g., bearings, casings for turbojets, etc.). In order to remedy some of the dimensional inaccuracies of Ring Rolling, the novel approach of Reverse Ring Rolling is proposed and investigated in the current analysis. The conducted research was based on a numerical simulation of a flat Ring Rolling process, previously presented by the authors. Since the final dimensions of the ring from the authors' previous work diverged from those initially expected, the simulation of a subsequent Reverse Ring Rolling process was performed to reach the target dimensions. The calculated deformational results revealed a great agreement in at least two of the three crucial dimensions. Additionally, the evaluation of the calculated stress, strain, temperature and load results revealed key aspects of the mechanisms that occur during the proposed process. Overall, it was concluded that Reverse Ring Rolling can effectively function as a corrective process, which can increase the dimensional accuracy of a seamless ring product with little additional post-processing and cost.
环件轧制是一种近净成形制造工艺，其产品存在一些可测量的尺寸误差。在高精度制造的范畴下，这一问题更为突出，因为这些不精确性使得此类产品无法满足高精度应用（如轴承、涡轮喷气发动机外壳等）严格的尺寸要求。为了弥补环件轧制的一些尺寸误差，本文提出并研究了一种新颖的反向环件轧制方法。所开展的研究基于作者之前提出的平环轧制工艺的数值模拟。由于作者之前工作中环件的最终尺寸与最初预期不同，因此进行了后续反向环件轧制工艺的模拟以达到目标尺寸。计算得到的变形结果显示，在三个关键尺寸中的至少两个尺寸上有高度一致性。此外，对计算得到的应力、应变、温度和载荷结果的评估揭示了该工艺过程中发生的机制的关键方面。总体而言，得出的结论是，反向环件轧制可以有效地作为一种矫正工艺，在几乎不增加额外后处理和成本的情况下提高无缝环件产品的尺寸精度。
