Rolling Stand Torque Control for Precise Bar Drawing
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Solution Overview
Problem
Existing methods for adjusting inter-stand drawing action in rolling and finishing processes fail to provide precise and consistent torque values across stands, leading to non-homogeneous product quality, deformations, and the need for significant inter-stand crossing times, limiting the process to bars with maximum diameters greater than 40mm.
Innovation Solution
A method and device that adjust the torque of individual stands in real-time by determining reference torque values during the initial segment of the bar's feed, using a proportional-integral algorithm to maintain desired torque values across stands, allowing for rapid adjustments and minimizing inter-stand distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional torque adjustment methods are used with significant inter-stand crossing times, then torque adjustment is possible, but the process is limited to bars with maximum diameters greater than 40mm and requires large plant spaces
Solution Approach 1:
The system determines reference torque values during the initial segment of the bar's feed, before the bar reaches subsequent stands. This preliminary determination allows rapid torque adjustments to be made in advance, eliminating the need for slow inter-stand crossing times and enabling processing of smaller diameter bars without requiring large plant spaces.
Solution Approach 2:
The patent replaces conventional mechanical torque adjustment methods with a computational control system using a proportional-integral algorithm. This substitution enables precise and rapid torque adjustments through electronic control rather than mechanical means, significantly reducing adjustment time and enabling high-speed processing.
2Ease of operation
If torque adjustment is performed in a consequential manner after the leading end exits the stand, then adjustment can be made, but repeated adjustments generate consequential stresses that cause deformations and markings on the bar
Solution Approach 1:
Reference torque values are determined during the initial feed segment, before the bar undergoes subsequent rolling operations. This preliminary setting prevents the need for repeated consequential adjustments that would generate damaging stresses, thereby maintaining bar integrity and preventing deformations and markings.
Solution Approach 2:
The proportional-integral algorithm continuously monitors and adjusts torque values based on feedback from the rolling process. This feedback mechanism ensures that torque remains precisely controlled throughout the process, preventing the kind of abrupt torque variations that cause bar deformations while maintaining ease of operation.
3Device complexity
If predefined reference torque values are used without considering specific operating conditions, then the adjustment process is simple, but the final product has non-homogeneous qualitative factors
Solution Approach 1:
The system determines reference torque values specific to each stand and its operating conditions rather than using uniform predefined values. This local customization of torque parameters ensures that each stand operates optimally for its specific conditions, producing homogeneous qualitative factors throughout the final product while managing complexity through modular stand-by-stand control.
Solution Approach 2:
The proportional-integral algorithm dynamically adjusts torque parameters based on specific operating conditions of each stand and the characteristics of the bar being processed. This parameter adaptation ensures high product homogeneity by tailoring torque values to actual conditions rather than relying on fixed predefined values, while keeping the control system manageable through automated adjustment.
Data Source
Figure 1~2
Figure 3~4
Figure 5a~5d
AI summary
The present invention concerns both a method to adjust the drawing action on a bar (11) in a rolling and/or finishing train (12), and also an adjustment device (10) associated with the train (12) and implementing said method.