Control of ring rolling with variable thickness and curvature
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...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
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Springer Paris
2019
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| _version_ | 1797100014381563904 |
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| author | Arthington, M Havinga, J Duncan, S |
| author_facet | Arthington, M Havinga, J Duncan, S |
| author_sort | Arthington, M |
| collection | OXFORD |
| description | 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. |
| first_indexed | 2024-03-07T05:31:43Z |
| format | Journal article |
| id | oxford-uuid:e2813981-fc55-4a4a-a714-254b1c08ae32 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T05:31:43Z |
| publishDate | 2019 |
| publisher | Springer Paris |
| record_format | dspace |
| spelling | oxford-uuid:e2813981-fc55-4a4a-a714-254b1c08ae322022-03-27T10:01:45ZControl of ring rolling with variable thickness and curvatureJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:e2813981-fc55-4a4a-a714-254b1c08ae32EnglishSymplectic Elements at OxfordSpringer Paris2019Arthington, MHavinga, JDuncan, SRadial-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. |
| spellingShingle | Arthington, M Havinga, J Duncan, S Control of ring rolling with variable thickness and curvature |
| title | Control of ring rolling with variable thickness and curvature |
| title_full | Control of ring rolling with variable thickness and curvature |
| title_fullStr | Control of ring rolling with variable thickness and curvature |
| title_full_unstemmed | Control of ring rolling with variable thickness and curvature |
| title_short | Control of ring rolling with variable thickness and curvature |
| title_sort | control of ring rolling with variable thickness and curvature |
| work_keys_str_mv | AT arthingtonm controlofringrollingwithvariablethicknessandcurvature AT havingaj controlofringrollingwithvariablethicknessandcurvature AT duncans controlofringrollingwithvariablethicknessandcurvature |