Improvement of the dishing process in ring rolling using conical guide rolls
Improvement of the dishing process in ring rolling using conical guide rolls
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DOI：
10.1007/s11740-016-0707-2
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发表时间：
2017-02
期刊：
影响因子：
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通讯作者：
J. Seitz;F. Kordtomeikel;G. Hirt
中科院分区：
文献类型：
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作者：
J. Seitz;F. Kordtomeikel;G. Hirt
环件轧制是一种用于生产无缝环件的增量体积成形工艺，适用于高载荷。对于无缝碟形环，有不同的领域，如海上，航空和采矿业的应用。目前，碟形环通过加工具有矩形横截面的环、通过在锥形心轴上（开式模具）中空锻造、通过在环轧制中使用成形的主辊和心轴或通过铸造来生产。这些制造方法具有不同的缺点，例如高材料浪费、长处理时间、几何限制或具有差的机械性能的铸造结构。如果盘形环件可以在传统的径向-轴向环件轧制米尔斯机上生产，则环件生产商的产品范围可以扩大，而没有当前制造工艺的缺点。在先前的研究中，碟形环件通过环件轧制成功地产生。然而，问题是该方法获得的形状精度和再现性差。因此，本研究的目的是通过用锥形模块代替导辊的下部圆柱形部分来提高在常规径向-轴向环件轧制米尔斯上生产的盘形环件的几何精度。采用这种改进的滚动策略，碟形角偏差从5°减小到1°。除了实验，最重要的数值和过程相关的参数对最终的几何形状和爬升高度的影响进行了研究，通过有限元模拟。
Ring rolling is an incremental bulk forming process for producing seamless rings, which are suited for high loads. For seamless dish shaped rings, there are applications in different areas such as offshore, aeronautics and the mining industry. At the moment, dish shaped rings are produced by machining of rings with rectangular cross section, by (open die) hollow forging on a conical mandrel, by using a shaped main roll and mandrel in ring rolling or by casting. These ways of manufacturing have different disadvantages, such as high material waste, long process time, geometrical limitations or a cast structure with poor mechanical properties. If dish shaped rings can be produced on conventional radial-axial ring rolling mills, the range of products for ring producers could be expanded without the disadvantages of the current manufacturing processes. In prior studies dish shaped rings were successfully generated by ring rolling. However, a problem was the achieved poor form accuracy and reproducibility of the process. Thus, the goal of this investigation is to improve the geometrical accuracy of dish shaped rings produced on conventional radial-axial ring rolling mills by replacing the lower cylindrical part of the guide rolls by a conical module. Using this improved rolling strategy, the dishing angle deviation was reduced from 5° to 1°. In addition to the experiments, the influence of the most important numerical and process related parameters on the final geometry and the climbing height was investigated by finite element-simulations.