Shiftable Tapered Work Roll Heating for Edge Drop Control
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Solution Overview
Problem
Existing rolling mills face challenges in controlling edge drop during metal plate rolling, as increasing the shift amount of work rolls to reduce edge drop can lead to edge up and plate breakage due to sharp tension changes, while methods to reduce edge cracks may inadvertently promote edge drop.
Innovation Solution
A rolling mill with a work roll capable of axial shifting and a heating unit forming a radial expansion portion in the tapered end portion, which suppresses edge tight and reduces plate breakage, allowing for increased shift amounts and effective edge drop control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the shift amount of the work roll is increased to reduce edge drop, then the edge drop is reduced more effectively, but edge up and plate breakage occur due to sharp tension changes
Solution Approach 1:
The invention applies local quality by providing a tapered portion at a specific location (axial end portion) of the work roll rather than modifying the entire roll. This localized modification allows the roll to be shifted axially to control edge drop at the plate edges while maintaining normal rolling conditions in the central region, thus preventing plate breakage caused by excessive shift amounts.
Solution Approach 2:
The tapered portion is pre-formed on the work roll before the rolling process. This preliminary structural preparation enables the work roll to be shifted axially during rolling to control edge drop, while the tapered geometry ensures that even with the shift, the contact between rolls and plate remains stable, preventing edge up and plate breakage.
2Measurement precision
If the shift amount of the work roll is increased to control edge drop precisely, then the axial range for gap adjustment increases, but edge tight occurs due to sharp tension changes at the plate widthwise edge portion
Solution Approach 1:
The tapered portion is localized at the axial end portion of the work roll, allowing axial shifting to adjust the gap at the plate edges for precise edge drop control. The taper geometry ensures that this local adjustment does not cause sharp tension changes in the plate, thereby preventing edge tight.
Solution Approach 2:
The tapered portion is pre-formed on the work roll to enable controlled axial shifting. This preliminary structural preparation allows the work roll to be shifted to achieve precise edge drop control while the tapered geometry prevents harmful tension changes that would cause edge tight.
3Strength
If an expansion portion is formed by heating the end portion of the work roll to increase rolling reduction of the edge portion, then edge cracks are reduced, but edge drop is promoted
Solution Approach 1:
Instead of forming an expansion portion by heating (which causes edge drop), the invention uses a tapered portion at the axial end of the work roll. This tapered geometry, when combined with axial shifting, allows precise control of the gap at the plate edges, reducing edge drop while still addressing edge integrity issues through controlled deformation.
Solution Approach 2:
The tapered portion is pre-formed on the work roll to enable controlled axial shifting during rolling. This preliminary structural preparation allows the work roll to be shifted to achieve precise edge drop control, avoiding the edge drop promotion that occurs with heated expansion portions.
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
The solution effectively reduces edge drop and improves yield by suppressing edge tight and plate breakage, enabling precise control of edge drop and increasing the shift amount of the work roll.
Implementation Method 1
a heating unit configured to form an expansion portion protruding in a radial direction in the tapered portion by heating the tapered portion
Data Source
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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.