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This study was funded by the National Natural Science Foundation of China (grant number: 51975301), the Natural Science Foundation of Zhejiang, China (grant number: LZ22E050002), and the
Major Project of Science and Technology Innovation 2025 in Ningbo City, China (grant number: 2022Z064).
With the rapid development of high-end equipment in aviation, high-speed rail, and other fields, the requirements for the
necessary shaft foundation parts on the equipment are more stringent. This has resulted in rapid development of the new
generation of three-roll skew rolling (TRSR) flexible forming shaft part technology. It is an important issue to explore the
theory and technology of TRSR flexible forming of hollow shaft and systematically expounding the flexible forming theory
of TRSR of hollow axle. Therefore, this paper explores the feasibility of TRSR through the combination of theory and experi-
ment and analyzes the formation mechanism as well as develop macro and micro uniformity law in order to clarify the quality
control measures. In order to realize the low-cost forming of hollow axle with short process, the piercing-rolling compound
forming (integrated forming of shape and inner hole of hollow axle) and the multi-roll skew tandem rolling technology for
large section shrinkage shafts are innovated. The forming mechanism is verified through the simulation research. Based on
the abovementioned research, it is concluded that skew-rolling composite integrated forming of large hollow shafts, multi-roll
skew tandem rolling technology for large section shrinkage shafts, and the flexible forming process and equipment of digital
TRSR is the future development direction of the TRSR flexible forming technology of hollow shaft. The results provide
a theoretical basis and development direction for improving the precision short process, high efficiency, and high-quality
manufacturing of high-end equipment shaft foundation.
