Abstract

The analysis of the influence exerted by the deformation techniques on the conditions of radial-shear rolling (RSR) of commercial purity aluminum A1050 is carried out. Based on finite-element modeling (FEM), the temperature change at various feed angles and elongation in the first and last passes is obtained. The increase in feed angle slightly raises the temperature variations in the surface layer due to the increase in reduction per pass but does not significantly influence total deformation heating during the RSR process. The finishing deformation temperature can be controlled by varying a reduction ratio. In this case, it is necessary to take into account the initial temperature of heating, dimensions of rolled products obtained, and elongation per pass. The dimensions of a workpiece have a significant effect on thermal changes in the RSR process. In the last pass, when the diameters are 20–14 mm, deformation heating is almost completely compensated for by rod cooling upon contact between the environment and the tool and begins to prevail, with an increase in elongation ratio of more than 1.2. An analysis of effective strain (ε_eff) at various deformation modes shows that the difference in ε_eff values over the cross section of the rod decreases with an increasing feed angle. A comparison of the data with the hardness and microstructure of the rolled A1050 samples shows that ε_eff has a significant impact on the change in the structure and properties to a certain value, which is confirmed by the distribution of the microhardness over the cross section of the rods. The mechanical properties of the rods correspond to the properties of commercial purity aluminum in the work-hardened state (σ_eff ~ 115 MPa, σ_0.2 ~ 110 MPa, δ ~ 1%, HV ~ 40–43).

中文翻译：

---

研究径向剪切轧制对A1050加工热变形条件的影响

摘要

分析了变形技术对工业纯铝A1050的径向剪切轧制（RSR）条件的影响。基于有限元建模（FEM），获得了第一道和最后道次在各种进给角和伸长率下的温度变化。进给角的增加由于每次通过的减少量的增加而略微增加了表面层中的温度变化，但并未显着影响RSR过程中的总变形加热。可以通过改变压下率来控制最终变形温度。在这种情况下，必须考虑加热的初始温度，获得的轧制产品的尺寸以及每道次的伸长率。工件的尺寸对RSR过程中的热变化有重大影响。在最后一次通过时，当直径为20–14 mm时，变形加热几乎完全由环境和工具之间接触时的杆冷却来补偿，并开始盛行，伸长率增加超过1.2。有效应变（ε_eff）在各种变形模式下显示，随着进给角的增加，杆横截面上的_εeff值之差减小。通过将数据与轧制的A1050样品的硬度和显微组织进行比较，可知_εeff对组织和性能变化至一定值有显着影响，这可以通过显微硬度在横截面上的分布来证实。棒。杆的机械性质对应于工业纯铝在加工硬化状态的属性（σ _EFF〜115兆帕，σ _0.2  〜110兆帕，δ〜1％，HV〜40-43）。