Aiming at the problem of uneven forces on the inner and outer surfaces during counter-roller spinning (CRS) of thin-walled cylinders, which affects the spinning stability and forming quality, a new dual asymmetric active counter-roller spinning (DAACRS) process is proposed. It enhances the radial strain uniformity through more consistent contact of the inner and outer rollers and the material flow on the inner and outer surfaces. The theoretical analytical model of the influence of the spinning structural and process parameters on the contact condition and the oriented relationship is established. On this basis, the Kriging predictive surrogate model under the coupling influence of these parameters is established, and the spinning parameters optimized by the multi-objective particle swarm optimization (MOPSO) algorithm in the global continuous variables are obtained. The radial strain gradient effect of traditional spun parts is basically eliminated under this process parameters. Additionally, an active counter-roller spinning (ACRS) machine is independently developed and a comprehensive macro-micro quality evaluation method is proposed. The ACRS process can transform the material from dispersed {001}<110> low-strength plate texture to more standard {001}<100> high-strength plate texture, and obtain balanced axial and circumferential tensile strengths. Moreover, the new DAACRS process resulted in more balanced forming accuracy, inner and outer surface grain size, texture strength, and isotropic mechanical properties due to the high radial strain uniformity. Compared with the traditional completely symmetric active counter-roller spinning (CSACRS), the , , , , , and are improved by 0.08265mm 000335mm, 4.83, 10.55%, 11.54%, and 16.34%, respectively. Further analysis provides that the allowable values of strain uniformity for the higher quality thin-walled cylinders are []=0.365 and []=0.438. These results increase the understanding of the strain change, microstructure evolution, and mechanical properties change mechanism of the CRS process, thereby providing important guidance for improving the CRS process and forming quality.

中文翻译：

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双非对称主动对辊旋压工艺提高薄壁圆柱径向应变均匀性

针对薄壁圆筒对辊旋压（CRS）过程中内外表面受力不均匀，影响旋压稳定性和成形质量的问题，提出了一种新型双非对称主动对辊旋压（DAACRS）工艺。建议的。它通过内、外滚子更一致的接触以及内、外表面上的材料流动来增强径向应变均匀性。建立了旋压结构和工艺参数对接触条件和取向关系影响的理论分析模型。在此基础上，建立了这些参数耦合影响下的Kriging预测代理模型，得到了全局连续变量下通过多目标粒子群优化（MOPSO）算法优化的纺丝参数。在此工艺参数下，基本消除了传统旋压零件的径向应变梯度效应。此外，自主研发了主动对罗拉旋压机（ACRS），并提出了宏观微观综合质量评价方法。ACRS工艺可以将材料从分散的{001}<110>低强度板织构转变为更标准的{001}<100>高强度板织构，并获得均衡的轴向和环向拉伸强度。此外，新的DAACRS工艺由于径向应变均匀性高，使得成形精度、内外表面晶粒尺寸、织构强度和各向同性机械性能更加平衡。与传统的完全对称主动对罗拉纺纱（CSACRS）相比， 、 、 、 、 、 和 分别提高了0.08265mm、000335mm、4.83、10.55%、11.54%和16.34%。进一步分析得出，对于较高质量的薄壁圆柱体，应变均匀性的允许值为[]=0.365和[]=0.438。这些结果增加了对CRS工艺应变变化、微观结构演变和力学性能变化机制的理解，从而为改进CRS工艺和成形质量提供重要指导。