Force-Controlled Rolling Stand Asymmetry Correction
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Solution Overview
Problem
Hot-rolling mills face difficulties in achieving symmetrical thickness and minimizing longitudinal curvature in rolled items due to initial tapered shapes, which can lead to material flow imbalances and subsequent processing challenges.
Innovation Solution
A force-controlled method using processing assemblies like vertical stands or lateral guides, where one assembly applies a defined transverse force based on a reference force, and the other tracks to maintain a constant midpoint position, effectively reducing asymmetry and curvature by adjusting separation between the assemblies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If asymmetrical rolled items with initial taper are processed through conventional rolling, then the volume retention causes greater material flow on the thick side, but this results in longitudinal curvature and strip saber formation that makes further processing impossible
Solution Approach 1:
The patent applies asymmetry by operating only one processing assembly (e.g., edger) while keeping the other idle, creating an intentional asymmetrical force distribution. This asymmetric configuration generates a transverse force that counteracts the inherent taper in the rolled item, redirecting material flow to achieve symmetrical thickness without causing longitudinal curvature
Solution Approach 2:
The processing assembly applies corrective force before the rolled item enters the rolling mill, pre-adjusting the asymmetrical geometry. By eliminating the taper in advance through force-controlled processing, subsequent rolling operations can proceed without generating strip saber or longitudinal curvature
2Measurement precision
If position control is used for processing assemblies, then the position can be maintained, but this is insufficient for successfully counteracting asymmetrical curves of rolled items
Solution Approach 1:
The patent changes the control parameter from position to force. By controlling the processing assembly with a reference force rather than a reference position, the system can dynamically adjust the magnitude of the transverse force to precisely counteract the asymmetrical geometry. The force-controlled processing assembly adapts its action based on the actual geometric state of the rolled item
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 allows for controlled geometry transformation of asymmetrical rolled items, reducing or eliminating taper and longitudinal curvature, thereby facilitating smoother processing and preventing distortion during rolling.
Implementation Method 1
the at least one processing assembly is operated in a force-controlled manner on the basis of a reference force
Implementation Method 2
reduced to a predetermined thickness in a roll gap of the rolling mill by pressure
Data Source
AI summary
A method influences the geometry of a rolled item in a controlled manner. In the method, the rolled item is transformed from an initial condition into an intermediate or final condition by rolling with the aid of a rolling stand having at least one processing assembly. An improvement in the geometry of the rolled item, particularly during processing of asymmetric rolled items, is achieved in that the at least one processing assembly is operated in a force-controlled manner on the basis of a desired force.