Ring-Roll Recessed Flange Geometry for Stable Ring Material Attitude
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Solution Overview
Problem
Ring-rolling methods face challenges in stabilizing the attitude of ring materials with tapered or non-uniform thicknesses, leading to defects and increased burden on the rolling device due to fluctuations in peripheral speed and diameter differences, especially when flange portions are used on the main roll.
Innovation Solution
A ring-rolling method involving a main roll with a recessed portion and inclined inner faces on flange portions to stabilize the ring material's attitude, using a Ni-based, Co-based, or Fe-based alloy, with specific slope angles to ensure smooth rolling without defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If flange portions are provided on the main roll to stabilize the attitude of the ring material, then the attitude stability is improved, but defects such as burrs are generated in the resulting ring-rolled member
Solution Approach 1:
The invention applies local quality by providing a slope only on specific inner faces (first or second inner face) of the recessed portion rather than uniformly on the entire main roll. This localized sloped surface stabilizes the ring material's attitude during rolling while preventing the ring material from being excessively compressed by the flange portions, thereby avoiding burr generation and other defects.
2Stability of the object's composition
If flange portions are provided on the main roll to stabilize the attitude of the ring material, then the attitude stability is improved, but the burden on the ring-rolling device increases
Solution Approach 1:
The invention reduces device burden by applying the sloped surface only to specific inner faces of the recessed portion rather than modifying the entire main roll structure. This localized approach achieves attitude stabilization with minimal additional complexity and burden on the ring-rolling device.
3Adaptability or versatility
If multiple patterns of main roll shapes are prepared to handle different ring material conditions, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The invention achieves universality by designing a single main roll with a recessed portion that has sloped inner faces. This unified structure can handle various ring material conditions (tapered shapes, non-uniform thicknesses) through the geometric design of the sloped surfaces, eliminating the need to prepare multiple patterns of main rolls and reducing device complexity.
4Stability of the object's composition
If the ring material is excessively compressed to stabilize rotation, then the attitude stability is improved, but defects are generated in the ring-rolled member
Solution Approach 1:
The sloped inner faces provide localized support that stabilizes ring material rotation without requiring excessive compression. The slope geometry allows the ring material to maintain stable rotation while avoiding excessive contact and compression that would cause defects.
Data Source
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AI summary
Provided is a ring-rolled member manufacturing method enabling stabilization of the attitude of the ring material without generating a defect and the like in the resulting ring-rolled member even when the main roll of the ring-rolling device is provided with the flange portions positioned on upper and lower sides of the ring material. A ring-rolling device used in the ring-rolled member manufacturing method of the present invention is provided with a main roll 10 and a mandrel roll 20. An outer peripheral face of the main roll includes a recessed portion 12 to accommodate the ring material and an outer peripheral face of the mandrel roll 20, an upper flange portion 11 positioned on an upper side thereof, and a lower flange portion 13 positioned on a lower side thereof. An inner face of the recessed portion includes a rolling face 12S to be in contact with an outer peripheral face of the ring material, an upper face on the upper flange portion side, and a lower face 13S on the lower flange portion side, the lower face 13 S having a slope in such a way that an opening of the recessed portion 12 is enlarged. The slope starts from within a range of a distance corresponding to a thickness of the ring-rolled member from a line of intersection between the lower face 13 S and the rolling face 12S. An angle of the slope is greater than 0.3° and no greater than 9° with reference to the perpendicular plane.