Incremental ring rolling to create conical profile rings

Cleaver, Christopher J.; Allwood, Julian M.

doi:10.1016/j.proeng.2017.10.878

Cited by 9 publications

(1 citation statement)

References 4 publications

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“…This relates mainly to non-rectangular ring cross sections, for which each desired cross section requires its own specific tool geometry [10,20]. Recently, a ring rolling process has been developed to produce rings with different cross sections, without using part-specific tooling [8,9]. Such an increase in production flexibility significantly extends the applicability of ring rolling for products, which are produced in small batches.…”

Section: Introductionmentioning

confidence: 99%

Control of ring rolling with variable thickness and curvature

2019

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Radial-Axial Ring Rolling (RARR) is an industrial forging process for making strong, seamless metal rings. Conventionally, rings are made circular with constant cross-section. In this work we demonstrate a sensing and control strategy to create rings with variable radial wall thickness and variable curvature using standard RARR hardware. This has a number of potentially useful applications but also provides an understanding of how to control these properties for conventional RARR. The sensing uses a calibrated video camera to take a series of images of the ring top surface. Image processing is employed to measure and track the ring material in-situ. The complete state of the ring is represented by the ring thickness and curvature as a function of its volume fraction, which is computed by combining the measurements from the unoccluded areas with estimates of the ring shape elsewhere. Additionally, we present a marking technique for tracking of material as it rotates through the rolling machine, even after significant deformation of the ring has occurred. We show that rings with a wide range of variation in local thickness and curvature can be formed using conventional RARR hardware and a photogrammetric state measurement technique, combined with open-loop scheduling and feedback control of thickness and curvature. Rings with both variable thickness and non-circular shapes have been produced virtually using numerical simulations and in reality using modelling clay as a material to simulate metals at forging temperatures. We demonstrate that this technique extends the range of shapes achievable with standard RARR hardware.

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