Variable Pressure Roller for Strip Rolling Edge Control
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Solution Overview
Problem
Existing strip rolling mills face challenges in maintaining consistent contact pressure during cold rolling of metal strips, particularly stainless steel, leading to over-pressing of web edges and reduced service life due to frequent roller wear, especially at higher speeds and varying web widths.
Innovation Solution
Designing at least one roller as an internally supported roller with a rotating jacket around a fixed yoke, equipped with a pressing device that adjusts radial pressure force, allowing for variable width adjustment and precise control of contact forces across the roller width, preventing over-pressing and ensuring consistent oil removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If higher pressure forces are applied to prevent roller floating at higher speeds, then contact pressure is improved, but web edges are over-pressed and shrink
Solution Approach 1:
The roller is designed with variable pressing force distribution across its width, with reduced pressure at the edges and higher pressure in the central area. This is achieved through the internally supported roller construction with a pressing device that applies differential force, preventing web edge over-pressing while maintaining sufficient contact pressure in the rolling area.
Solution Approach 2:
The internally supported roller construction allows dynamic adjustment of the pressing force profile. The pressing device can adapt the pressure distribution to match varying web widths and operating conditions, enabling the system to maintain optimal contact pressure without fixed geometric constraints.
2Manufacturing precision
If cambered rollers are used to prevent web edge over-pressing, then web edge dimensions are improved, but roller service life deteriorates due to frequent wear
Solution Approach 1:
Instead of using fixed cambered geometry, the invention employs an internally supported roller with a pressing device that dynamically adjusts the pressure profile. This eliminates the wear associated with fixed cambered surfaces while maintaining the ability to prevent web edge over-pressing through controlled pressure distribution.
Solution Approach 2:
The pressing force parameters are made variable through the pressing device, allowing the system to adjust the pressure profile according to operating conditions rather than relying on fixed geometric camber. This reduces wear by avoiding concentrated stress points while maintaining effective web edge control.
3Device complexity
If fixed geometric pressing is used, then device complexity is reduced, but adaptability to varying web widths deteriorates
Solution Approach 1:
The internally supported roller construction incorporates a pressing device that enables dynamic adjustment of the pressure profile to match varying web widths. This provides adaptability without requiring complex geometric redesigns, as the pressing force distribution can be modified independently of the roller geometry.
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 solution extends the service life of rollers, prevents edge damage, and allows for higher operating speeds, improving the overall productivity and surface quality by maintaining consistent pressure and effective oil removal.
Implementation Method 1
a pressing device (12) being arranged between the yoke and the jacket (9) which loads the jacket in a radial direction with a pressing force outwards
Implementation Method 2
The rollers form a nip through which the metal web is guided and subjected to pressure. As a result, an oil film on a surface of the metal web is squeezed off.
Data Source
Figure 1~3
Figure 4
AI summary
The invention relates to a squeezing unit (5) for a strip rolling mill and to a strip rolling mill comprising such a squeezing unit, wherein the squeezing unit (5) has an upper roller (6) and a lower roller (7), between which a squeezing nip (8) is formed. To achieve long service lives, ensure low residual moisture and minimize surface damage on the strip, at least one of the rollers (6, 7) is provided with a revolving shell (9) and a stationary yoke (10), which passes axially through the shell (9), wherein a pressing device (12) is arranged between the yoke (10) and the shell (9). The pressing device (12) subjects the shell (9) to an outward bearing pressure in a radial direction, wherein the bearing pressure is variable over a roller width such that zonal control and active width adjustment are effected.