Manufacturing dish shaped rings on radial-axial ring rolling mills

Seitz, Joachim; Jenkouk, Vahid

doi:10.1007/s11740-013-0486-y

Cited by 15 publications

(9 citation statements)

References 1 publication

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“…Therefore, it is widely used in the fields of mechanical industry, wind power, aerospace, and so forth. The most typical conical products are nozzle supports, flanges [ 1 ], aeroengine accessory, the main part of nuclear reactor shell [ 2 ], and aluminum alloy conical ring with inner steps [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

“…Their simulation results were in accordance with experimental ones. Seitz et al [ 1 ] simulated and manufactured a dish-shaped ring with a thicker ring wall and lower ring height on radial-axial ring rolling mills and pointed out that a larger height reduction of the ring can result in dishing and ring climbing. Han et al [ 3 ] optimally designed a prorolled ring blank in the aluminum alloy hot rolling process of a conical ring with inner steps by simulation and experimental methods.…”

Section: Introductionmentioning

confidence: 99%

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The Effects of Forming Parameters on Conical Ring Rolling Process

Zhao

Guan

2014

The Scientific World Journal

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The plastic penetration condition and biting-in condition of a radial conical ring rolling process with a closed die structure on the top and bottom of driven roll, simplified as RCRRCDS, were established. The reasonable value range of mandrel feed rate in rolling process was deduced. A coupled thermomechanical 3D FE model of RCRRCDS process was established. The changing laws of equivalent plastic strain (PEEQ) and temperature distributions with rolling time were investigated. The effects of ring's outer radius growth rate and rolls sizes on the uniformities of PEEQ and temperature distributions, average rolling force, and average rolling moment were studied. The results indicate that the PEEQ at the inner layer and outer layer of rolled ring are larger than that at the middle layer of ring; the temperatures at the “obtuse angle zone” of ring's cross-section are higher than those at “acute angle zone”; the temperature at the central part of ring is higher than that at the middle part of ring's outer surfaces. As the ring's outer radius growth rate increases at its reasonable value ranges, the uniformities of PEEQ and temperature distributions increase. Finally, the optimal values of the ring's outer radius growth rate and rolls sizes were obtained.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Effects of Forming Parameters on Conical Ring Rolling Process

Zhao

Guan

2014

The Scientific World Journal

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“…Therefore, a wide application is found in many industry fields, such as aeronautics, petroleum industry, mechanical industry, wind power, and nuclear power. The typical conical ring products are aeroengine turbine casings, nuclear reactor shells [1], nozzle supports, seals, and flanges [2].…”

Section: Introductionmentioning

confidence: 99%

“…Usually, in rolling a rectangular ring process, the rolling strategy that would roll a rectangular ring into a dish-shaped one should be avoided, since the dish-shaped ring was regarded as a forming error. But Seitz et al [2] just utilized this situation and presented a rolling strategy to manufacture a dish-shaped ring from a rectangular ring blank. Their numerical simulation results were in good agreement with experimental ones in their study.…”

Section: Introductionmentioning

confidence: 99%

A Mandrel Feeding Strategy in Conical Ring Rolling Process

Zhao

Guan

2014

Mathematical Problems in Engineering

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A mathematical model for radial conical ring rolling with a closed die structure on the top and bottom of driven roll, simplified as RCRRCDS, was established. The plastic penetration and biting-in conditions in RCRRCDS process were determined. A mandrel feeding strategy for RCRRCDS process was proposed. The mandrel feed rate and its reasonable value range were deduced. The coupled thermal-mechanical FE model of RCRRCDS process was established. The reasonable value range of the mandrel feed rate was verified by using numerical simulation method. The results indicate that the reasonable value range of the mandrel feed rate is feasible, the proposed mandrel feeding strategy can realize a steady RCRRCDS process, and the forming quality of conical ring rolled by using the proposed feeding strategy is better than that of conical ring rolled by using a constant mandrel feed rate.

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“…Understanding and controlling the dishing process in ring rolling in order to manufacture dish shaped rings could increase the flexibility of producible geometries for ring rolling companies in the future. For this reason, the intended initiation of dishing in ring rolling seems to be a promising alternative manufacturing process [3].…”

Section: Introductionmentioning

confidence: 99%

Intended Dishing in Ring Rolling

Seitz

Schwich

2014

KEM

Self Cite

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Ring Rolling is a versatile metal-forming process to manufacture seamless rings of various cross-sectional geometries. Rings with a “dish shape” are used in different areas such as offshore, aeronautics or the energy sector. Current ways to produce dish shaped rings have the disadvantages of limited or inflexible geometries and either high material waste, additional costs for special tools or long process time. Instead, when manufacturing dish shaped rings on conventional radial-axial ring rolling mills, ring producers will be able to expand the range of their products easily. In a prior investigation, the general feasibility of an alternative to the current manufacturing processes was shown in experiments and in finite element method (FEM) simulations, avoiding major additional machining and material costs. Resulting from an analysis of the geometrical requirements and material flow mechanisms for dishing and ring climbing, a rolling strategy was derived, applying a large height reduction of the ring. A major problem of this rolling strategy is that whenever the contact between the ring and the main roll is lost in the process, the ring starts to oscillate around the mandrel and neither dishing nor ring climbing can be observed. In order to ensure a permanent contact between ring and main roll and in order to stabilize the ring in its inclined position in the rolling mill, additional stabilizing measures of the process will be developed and investigated. With the developed FE-model, a stabilizing measure by the use of pressure rolls and automatic guide roll movement for ring climbing was tested and appears promising for the application in a real experimental environment.

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Manufacturing dish shaped rings on radial-axial ring rolling mills

Cited by 15 publications

References 1 publication

The Effects of Forming Parameters on Conical Ring Rolling Process

The Effects of Forming Parameters on Conical Ring Rolling Process

A Mandrel Feeding Strategy in Conical Ring Rolling Process

Intended Dishing in Ring Rolling

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