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Research on a multi-step spinning process for manufacturing disc-like part with thickened rim

Jin Junsong, Wang Shaolei, Tang Xuefeng, Liu Famei, Su Xuedong, Wang Xinyun

Archives of Civil and Mechanical Engineering

2022

Vol. 22, no. 1

art. no. e3, 2022

In this research, a multi-step spinning process was proposed to manufacture disc-like metallic parts with thick rim. The feasibility of this new process was validated by finite element (FE) simulation and forming experiment, while some undesirable geometries and defects including fold, pit, and underfilling were observed during each forming stage. To improve the forming quality, the effects of critical dimension parameters of rollers on the forming stability, streamline distribution, filling performance, and forming defects were systematically investigated by combination of FE and experimental analysis. The results showed that the dimension parameters of the roller significantly affect the forming stability and the streamline distribution, and the forming step has a remarkable effect on the filling performance. A circular slab with a diameter of 326 mm and a thickness of 3 mm was successfully formed into a defect-free disc-like part that has a thick rim with a width of 7.8 mm and thickness of 9.1 mm using the optimized parameters. This work presents a comprehensive understanding of the flow behavior and defects generation mechanism of the newly developed multi-step spinning process which can be used to manufacture large disc parts with thin web and thick rim.

Study on Dynamic Recrystallization Models of 21-4N Heat Resistant Steel

Li Yiming, Huang Xiaomin, Ji Hongchao, Li Yaogang, Wang Baoyu, Tang Xuefeng

Archives of Metallurgy and Materials

2021

Vol. 66, iss. 1

145--152

The high-temperature deformation process and dynamic recrystallization (DRX) process of 21-4N were investigated under the conditions of the deformation temperature range of 1273~1453K, the strain rate range of 0.01~10s-1 and the deformation degree of 60% (the total deformation is 0.916) by using Gleeble-1500D thermal simulated test machine. The curves of stress-strain (σ – ε) were obtained, and the curves of work hardening rate (θ) and strain (ε) were obtained by taking derivative of σ – ε. The DRX critical strains under different conditions were determined by the curves of work hardening rate (θ – ε), and the DRX critical strain model was established. The peak strains of 21-4N were obtained by the curves of σ – ε, the relationship between peak stress (σp) and critical strain (εc) was determined, and the peak strain model was established. The DRX volume fraction models of 21-4N were established by using Avrami equation. The DRX grain size of 21-4N was calculated by Image Pro Plus 6.0, and its DRX grain size models were established.