Research on microstructure evolution of the three-roll skew rolling hollow axle

Wang, Jitai; Shu, Xuedao; Zhang, Song; Li, Shuxin; Pater, Z.; Xia, Yingxiang; Bartnicki, J.

doi:10.1007/s00170-021-07991-7

Cited by 11 publications

(9 citation statements)

References 15 publications

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“…Overall, with the progress of rolling, the grain size of the already formed area will slightly increase. The average surface grain size is refined from 62.6 to 15-25 μm, demonstrating that the TRSR technique can refine the grain size and improve the microstructure properties of the hollow axle [10].…”

Section: Resultsmentioning

confidence: 92%

“…This procedure usually cuts off the metal fiber, which could be detrimental to the mechanical performance [9]. In this study, a novel forming method has been applied, which is the three-roll skew-rolling (TRSR) process [10]. This method is a die-free flexible forming technique that can form different shapes of axles by real-time controlling the distance between the rolls, and compared to traditional machining, forging, or cross wedge rolling process; it has the following advantages: higher utilization rate, higher efficiency, lower cost, and less environmental pollution.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure evolution of three-roll skew-rolling formed hollow axles with uniform wall thickness.

Chen

Zhang²,

Bidare³

et al. 2022

Preprint

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The uniform thickness hollow axle is one of the lightest weight axles in the high-speed rail industry. It can effectively reduce unsprung mass and further improve the train speed. Therefore, due to its importance and significance, it is crucial to research and develop the uniform thickness hollow axle. To understand the microstructural evolution during three-roll skew-rolling (TRSR) forming, 30CrMoA alloy steel was used in this study. A constitutive model of 30CrMoA was established by SIMUFACT FORMING finite element software and utilized to simulate the deformation, heat transfer, and microstructure coupling during TRSR. Via analyzing the influence of process parameters on the average grain size, the microstructural evolution of the forming part at each deformation stage is revealed. The result shows that the dynamic recrystallization of the rolled piece produces a fine and uniform grain structure during the forming process. The refinement level is enhanced with the increase of the radial compression; the grain size is gradually increased from the outer surface to the inner surface of the rolled piece. At a higher rolling temperature, it was found the initial grain size and final average grain size were larger compared to the lower temperature. By increasing the axial traction speed, not only can the rolling time be shortened, but also the appearance of coarse grains can be avoided. Therefore, the mechanical properties can be improved.

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Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Microstructure evolution of three-roll skew-rolling formed hollow axles with uniform wall thickness.

Chen

Zhang²,

Bidare³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Meanwhile, they conceived a concept of manufacturing a hollow axle using three skewed rolls moving at the same rotating speed, an axially moving chuck and a moving mandrel [16]. The feasibility [17] and the microstructure [18] of the TRSR hollow axle were also systematically studied by 2 of 18 Ningbo University. It was concluded that three-roll skew rolling is an advanced process for the hollow axle of high-speed trains.…”

Section: Introductionmentioning

confidence: 99%

Forming Quality Research on the Variable-Diameter Section of the Hollow Axle in Three-Roll Skew Rolling

et al. 2022

Self Cite

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The hollow axle is the key component of the high-speed train, and the realization of high-quality forming is the key to ensure the safety of train operation. In this paper, the specimen of the variable-diameter section of the hollow axle is taken as the research object, and the generation mechanism of surface spiral mark defects and the formula of spiral mark depth of variable-diameter section in the TRSR (three-roll skew rolling) process with variable roll spacing are explored. The external roundness error and the function C to measure the wall thickness uniformity of the cross-section were taken as the evaluation indexes and the single-factor simulation experiment was established and simulated in the software Simufact.forming16.0 to obtain the influence law of each process parameter on the external roundness error and wall thickness uniformity of the rolled piece. Orthogonal tests were designed and the order and optimal combination of process parameters on the forming quality were obtained by range analysis and ANOVA analysis. The research results provide theoretical guidance for improving the forming quality of the variable-diameter section of the hollow axle in three-roll skew rolling, and promote the transformation of the TRSR process to high performance and accurate forming.

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“…Zhang et al studied the spiral mark defect on the axle of three roll skew rolling, quantified the spiral mark defect through theoretical derivation, and finally put forward the corresponding improvement method [9]. Wang et al used a combination of experiments and simulations to study the evolution law of microstructure of three roll skew rolling hollow axle, and the optimal combination of process parameters was obtained [10]. Predecessors have done a lot of research work on three roll skew rolling axle, but no one has done the research on the temperature change law of three roll skew rolling hollow axle.…”

Section: Introductionmentioning

confidence: 99%

Research on variation law of workpiece temperature of three roll skew rolling hollow axle

Wang

Shu

Zhang

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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To explore the variation law of workpiece temperature in the process of three roll skew rolling (TRSR) hollow axle, the process of TRSR hollow axle is tested and simulated in this paper. Firstly, the working principle of TRSR hollow axle is described; Then the blank and rolling process parameters are selected according to the actual performance of TRSR mill; Next, the finite element model is established, and the changes of workpiece temperature are studied; Finally, the simulation results are verified by experiments. The results show that the simulation results are basically consistent with the experimental results. The temperature change of workpiece in the rolling process is very small as a whole, and the temperature drop will be greater only at the place in contact with the die.

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Research on microstructure evolution of the three-roll skew rolling hollow axle

Cited by 11 publications

References 15 publications

Microstructure evolution of three-roll skew-rolling formed hollow axles with uniform wall thickness.

Microstructure evolution of three-roll skew-rolling formed hollow axles with uniform wall thickness.

Forming Quality Research on the Variable-Diameter Section of the Hollow Axle in Three-Roll Skew Rolling

Research on variation law of workpiece temperature of three roll skew rolling hollow axle

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