Tapered Work Roll Heating for Edge Drop Control in Plate Rolling
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Solution Overview
Problem
Existing rolling mill technologies face challenges in effectively reducing edge drop in metal plates during rolling, as increasing the shift amount of work rolls to control edge drop can lead to edge up and plate breakage, while methods to reduce edge cracks may inadvertently promote edge drop.
Innovation Solution
A rolling mill with axially shiftable work rolls featuring a tapered portion and a heating unit that forms a radial expansion portion in the tapered area, allowing for precise control of edge drop by adjusting the heating position and roll shift to suppress edge tight and prevent plate breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the shift amount of the work roll is increased to control edge drop, then the edge drop can be reduced more effectively, but edge up and plate breakage occur due to sharp tension changes
Solution Approach 1:
The invention applies local quality by creating a tapered portion only at the axial end portion of the work roll, rather than making the entire roll surface uniform. This localized geometric modification allows the edge portion to have different rolling characteristics (reduced rolling reduction) compared to the central portion, thereby suppressing edge tight and preventing plate breakage while maintaining effective edge drop control through axial shifting
Solution Approach 2:
Instead of trying to increase rolling reduction at the edge to prevent edge drop, the invention inverts the approach by creating a tapered portion that reduces rolling reduction at the edge. This counterintuitive solution suppresses edge tight, allowing larger axial shifts without causing plate breakage, thereby enabling better edge drop control through increased shift amount
2Manufacturing precision
If the shift amount of the work roll is increased to control edge drop, then the edge drop can be reduced more effectively, but the axial range requiring gap adjustment increases making control more difficult
Solution Approach 1:
The tapered portion creates localized geometric variation at the axial end, which modifies the rolling characteristics only in that specific region. This allows the gap adjustment to be focused and simplified, as the tapered geometry naturally compensates for the increased axial shift range, reducing the complexity of maintaining uniform gap across the entire roll width
3Strength
If an expansion portion is formed by heating the end portion of the work roll to reduce edge cracks, then edge cracks are reduced, but edge drop is promoted
Solution Approach 1:
The invention applies local quality through a tapered geometric modification at the axial end portion, which creates a gradual transition in roll surface geometry. This tapered shape reduces rolling reduction at the edge in a controlled manner, suppressing edge tight and preventing plate breakage, thereby enabling effective edge drop control through axial shifting while avoiding the edge drop promotion caused by uniform expansion portions
Solution Approach 2:
Instead of using thermal expansion to create a uniform expansion portion, the invention changes the geometric parameter of the roll surface by creating a tapered portion with a specific slope. This geometric parameter change achieves reduced rolling reduction at the edge without the uniform expansion effect that promotes edge drop, allowing for better edge drop control
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively reduces edge drop and improves yield by suppressing edge tight and plate breakage, enabling increased shift amounts of work rolls while maintaining precise edge drop control.
Implementation Method 1
a heating unit configured to form an expansion portion protruding in the radial direction in the tapered portion by heating the tapered portion
Data Source
AI summary
A rolling mill is provided with: a roll for rolling a metal plate, the roll being capable of shifting in an axial direction and having a tapered portion at an end portion in the axial direction; and a heating unit configured to form an expansion portion protruding in a radial direction in the tapered portion by heating the tapered portion.