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.

环滚动过程用于在宽几何谱中生产由不同材料制成的无缝环。几何灵活性是该生产过程的主要优点之一。对近乎净形状几何技术的需求减少材料和后处理成本，从而开发了通过应用形状工具以径向和轴向方向制造环的过程的开发。通过使用创新的工具和过程控制概念，生产者的几何变量增加而不降低过程灵活性，就像形状工具一样。所有这些过程变体允许制造具有恒定横截面的剖面环的生产。还需要在圆周周围具有非恒定横截面的无缝环，例如对于偏心轴承，但这些轴承尚无法在环滚动过程中产生。此处描述的项目旨在进一步开发环滚动过程，以便能够接近这种怪异环几何形状的净形产生。这可以通过根据机器中环的圆周运动进行针对性的闭合和打开运动来实现。测量戒指旋转的必要机制已经安装在rwth Aachen University的金属形成研究所的两个指南卷中。然后，所提供的信息将传输到机器的控制中，以允许基于此信息的工具动作的实时控制。此外，通过使用现有的有限元模型，通过使用Priore关系控制，以简化的方式使用环上的参考点来控制Mandrel运动，从而显示了这种环几何形状的产生。在这里，有必要在模拟中实现实验中使用的方法，以考虑导胶与环的潜在接触损失。在进一步的步骤中，将通过使用模拟来研究过程的影响和边界。在成功实施测量系统以及工具运动的现实之后，将通过产生具有不同高度对壁厚度比和潜在的其他影响参数的两个环几何形状来实验验证数值结果。预计第一几何形状相对容易产生，而第二几何形状显示出较低的环刚度导致的狭窄边界。在第二阶段，项目的重点将是改进过程控制，生产几个厚部分的环，以及局部不同应变对环的微观结构的影响。