Spinning Forming and Stress Relieving of D406A Ultra-large Aspect Ratio Thin-walled Shell

WU Longmei; KANG Quan; ZHOU Mingjun; SHI Yancheng; ZHANG Hong

doi:10.3969/j.issn.1674-6457.2025.06.025

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (6) : 238-246. DOI: 10.3969/j.issn.1674-6457.2025.06.025

Advanced Manufacturing technology and Equipment

Spinning Forming and Stress Relieving of D406A Ultra-large Aspect Ratio Thin-walled Shell

WU Longmei¹, KANG Quan^2*, ZHOU Mingjun², SHI Yancheng², ZHANG Hong³

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Abstract

To solve the difficulty in the whole spinning forming of D406A with the aspect ratio greater than 10 and the length exceeding 3 m and the removal of the residual stress inside the product after spinning, the work aims to study the spinning process and stress removal method. Firstly, according to the characteristics of the product, the spinning forming process plan was established. In order to determine the reasonable spinning process parameters, the spinning experiments with different thinning rates, feed ratios and spinning passes were designed, and the results of each group of experiments were analyzed. Secondly, according to the analysis results of spinning experiments, the spinning process parameters and tooling were optimized, and the actual production was carried out. Finally, in order to effectively remove the residual stress inside the product, the stress relief annealing method was adopted, and the experiments of low temperature annealing (300-350 ℃) and high temperature annealing (600-650 ℃) were carried out in groups, and the stress and metallographic structure after annealing were measured. The actual production and processing results met the processing quality and precision requirements of the product. At the same time, the residual stress of the product was completely eliminated after high temperature annealing, and the metallographic structure did not change, which was a small spherical pearlite. The spinning process method proposed in this work is feasible, and the selected spinning parameters such as pass thinning rate and feed ratio are reasonable, which can provide reference for the spinning forming of thin-walled shells with large aspect ratio. Moreover, high temperature annealing is an effective and reasonable method to eliminate the internal residual stress of D406A ultra-high strength steel after spinning.

Key words

slender thin-walled shell / spinning forming / process parameter / stress relieving / high temperature annealing

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WU Longmei, KANG Quan, ZHOU Mingjun, SHI Yancheng, ZHANG Hong. Spinning Forming and Stress Relieving of D406A Ultra-large Aspect Ratio Thin-walled Shell[J]. Journal of Netshape Forming Engineering. 2025, 17(6): 238-246 https://doi.org/10.3969/j.issn.1674-6457.2025.06.025

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