Investigation of flexible radial ring rolling for production of non-axially symmetric seamless rings on radial axial ring rolling mills

在径向轴向环件轧机上生产非轴对称无缝环的柔性径向环件轧制研究

• 批准号: 454751242
• 负责人: Professor Dr.-Ing. Gerhard Hirt
• 金额: --
• 依托单位: Institut für Bildsame Formgebung (IBF)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2021
• 资助国家: 德国
• 起止时间: 2020-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/454751242?language=en
• 关键词: Investigation; flexible; radial; ring; rolling

The ring rolling process is used to produce seamless rings made of different materials in a wide geometric spectrum. The geometric flexibility is one of the main advantages of this production process. Demand for near net shape geometries to reduce material and post-processing costs led to the development of processes to manufacture rings profiled in radial and axial directions by applying shaped tools. By using innovative tool and process control concepts the producible geometric variety was increased without reducing the process flexibility, as is the case for shaped tools. All of these process variants allow manufacture of profiled rings with constant cross sections around their circumference. There is also demand for seamless rings with non-constant cross sections around the circumference, e.g. for eccentric bearings, but these cannot yet be produced in the ring rolling process.The project described here aims to further develop the ring rolling process in order to enable near net-shape production of such eccentric ring geometries. This can be achieved by performing a targeted closing and opening movement of the mandrel depending on the circumferential motion of the ring in the machine. A necessary mechanism to measure the ring’s rotation was already installed in both guide rolls of the ring rolling machine at the Institute of Metal Forming of the RWTH Aachen University. The provided information will then be transmitted into the machine’s control to allow for real-time control of the tool’s motions based in this information. Additionally, by use of an existing finite element model the producibility of such ring geometries was shown in principle by using the aforementioned process control, which was done in a simplified way using a reference point on the ring to control the mandrel movement. Here it is necessary to implement the method used in the experiments into the simulation to consider potential loss of contact of the guide roll(s) with the ring. In further steps, process influences and boundaries will be investigated by use of the simulation. After successful implementation of the measurement system as well as realisation of the tool motions the numerical results will be verified experimentally by producing two ring geometries with different height-to-wall thickness ratios and potential additional influencing parameters will be identified. The first geometry is expected to be comparatively easy to produce while the second geometry shows more narrow boundaries resulting from a lower ring stiffness. In a second phase the project’s focus will be improvement of the process control, production of rings with several thick sections and the effect of locally different strains on the microstructure of the rings.

环轧工艺用于生产由不同材料制成的各种几何形状的无缝环。几何灵活性是该生产工艺的主要优点之一。为了减少材料和后处理成本而对近净形状几何形状的需求导致了通过应用成形工具制造径向和轴向异形环的工艺的开发。通过使用创新的刀具和工艺控制概念，可生产的几何形状种类有所增加，而不会降低工艺灵活性，就像异形刀具的情况一样。所有这些工艺变体都允许制造在其圆周上具有恒定横截面的异形环。还需要沿圆周具有非恒定横截面的无缝环，例如环。用于偏心轴承，但这些还不能在套圈轧制工艺中生产。这里描述的项目旨在进一步开发套圈轧制工艺，以便能够近净形生产这种偏心套圈几何形状。这可以通过根据机器中环的圆周运动执行心轴的目标关闭和打开运动来实现。亚琛工业大学金属成形研究所的环件轧制机的两个导辊中已经安装了测量环件旋转的必要机构。然后，提供的信息将被传输到机器的控制器中，以便根据该信息实时控制工具的运动。此外，通过使用现有的有限元模型，原则上通过使用上述过程控制显示了这种环几何形状的可生产性，该过程控制是使用环上的参考点来控制心轴运动以简化的方式完成的。这里有必要将实验中使用的方法应用到模拟中，以考虑导辊与环的潜在接触损失。在进一步的步骤中，将通过模拟来研究过程影响和边界。在成功实施测量系统以及实现工具运动后，将通过产生具有不同高度与壁厚比的两个环几何形状来对数值结果进行实验验证，并且将确定潜在的附加影响参数。第一种几何形状预计相对容易生产，而第二种几何形状由于较低的环刚度而显示出更窄的边界。在第二阶段，该项目的重点将是改进工艺控制、具有多个厚截面的环的生产以及局部不同应变对环的微观结构的影响。