Wire Rod Cross Section Control via Upstream Traction
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Solution Overview
Problem
Modern wire rod rolling lines face challenges in maintaining narrow cross-sectional tolerances and uniformity of the rolled wire rod strand due to varying rolling conditions, including entry cross section and temperature variations, which result in traction fluctuations and tolerance deviations.
Innovation Solution
The method involves applying controlled traction to the wire rod strand upstream of the last common drive group, using a pair of controllable-speed horizontal-roll and vertical-roll mill stands, with a traction control unit that adjusts the tractive force based on real-time measurements to ensure a constant and uniform cross section, allowing for adaptive control independent of changing rolling conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual correction of rolling mill line parameters is used, then operation flexibility is maintained, but cross-sectional tolerance and uniformity deteriorate
Solution Approach 1:
The patent implements an automatic control system that continuously measures the cross-sectional dimensions of the rolled wire rod and feeds this information back to the rolling mill stands. The control unit compares measured values with target values and automatically adjusts rolling parameters to maintain cross-sectional tolerance within specified limits, eliminating the need for manual correction while achieving narrow tolerances.
Solution Approach 2:
The patent replaces manual mechanical parameter adjustment with an automated control system that uses sensors, control units, and actators. This substitution of mechanical manual operation with an automated control loop enables precise cross-sectional control without requiring manual intervention, resolving the contradiction between manufacturing precision and ease of operation.
2Manufacturing precision
If rolling conditions are allowed to vary naturally, then process simplicity is maintained, but cross-sectional uniformity deteriorates due to traction fluctuations
Solution Approach 1:
The control system continuously monitors cross-sectional dimensions and rolling conditions, using this feedback to automatically adjust牵引 forces applied by rolling mill stands. This closed-loop control compensates for natural variations in rolling conditions, maintaining cross-sectional uniformity without requiring complex manual intervention or over-engineering of the rolling process.
Solution Approach 2:
The patent dynamically adjusts rolling parameters including牵引 force, roll speed, and gap settings based on real-time measurements of cross-sectional dimensions and material properties. These parameter changes are automatically managed by the control system, achieving cross-sectional uniformity while keeping the overall process relatively simple through automated adaptation rather than complex fixed mechanisms.
3Manufacturing precision
If entry cross section variations are not controlled, then process simplicity is maintained, but outlet cross section tolerance deteriorates
Solution Approach 1:
The control system measures and controls the cross-sectional dimensions of the wire rod at the entry to the finishing unit before rolling occurs. By detecting and correcting cross-sectional variations upstream, the system ensures that the material enters the finishing stands with uniform dimensions, preventing tolerance deterioration at the outlet and eliminating the need for complex post-rolling correction mechanisms.
Solution Approach 2:
The patent implements upstream cross-sectional measurement and control that provides feedback to the rolling mill stands. This feedback loop enables real-time adjustment of rolling parameters to maintain entry cross-section uniformity, which directly prevents outlet tolerance issues without requiring complex downstream intervention or over-engineering of the finishing unit.
4Manufacturing precision
If common drive group speed is not adjusted, then operational simplicity is maintained, but cross-sectional control capability deteriorates
Solution Approach 1:
The patent separates the control of牵引 force from the control of drive group speed. Individual rolling mill stands within the common drive group can apply differentiated牵引 forces through independent roll gap adjustments and localized traction control, while the overall drive group maintains synchronized operation. This segmentation enables precise cross-sectional control without requiring complex speed variations of the common drive group.
Solution Approach 2:
The control system applies localized牵引 control at specific rolling mill stands rather than uniformly adjusting the entire common drive group speed. By enabling individual stands to independently control牵引 force on the wire rod, the system achieves precise cross-sectional control while maintaining the operational simplicity of common drive synchronization, resolving the contradiction between control capability and device complexity.
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 approach enables the production of wire rod with consistent and narrow cross-sectional tolerances over its length, optimizing the finish cross section while minimizing fluctuations, even under varying rolling conditions, by directly controlling the entry cross section into the finishing unit without requiring speed adjustments of the common drive group.
Implementation Method 1
the cross section of the wire rod strand during the rolling process can be altered by controlled application of traction to the strand
Implementation Method 2
a rolled wire rod strand passes from an intermediate portion of the rolling line to a finish rolling unit
Data Source
AI summary
In a wire rod mill, the last rolling block or unit, either a finishing unit or a postfinishing rolling unit, with common drive is not used for traction control, but traction control upstream thereof is provided to regulate the cross section of the wire rod strand before entry into the last stage. The product is a wire rod strand of low cross sectional tolerance and high uniformity over the length of the rod.