Stepped Metal Strip Rolling via Geometric Roll Gap Law
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Solution Overview
Problem
Existing methods for producing stepped thickness profiles in metal strips require a large number of pressure rollers arranged offset, leading to expensive construction and limited processing capabilities, especially for wider steps, and fail to reduce step heights effectively without causing corrugations.
Innovation Solution
A method using a roll stand with adjacent partial rolls and varying roll gaps, where the size differences between adjacent gaps follow a specific geometric law to achieve uniform thickness reduction across the metal strip without rippling, allowing for efficient step profiling with fewer rollers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a large number of pressure rollers arranged offset are used to produce stepped thickness profiles, then the processing capability for wider steps is improved, but the construction cost and device complexity increase significantly
Solution Approach 1:
The rolling process is segmented into two distinct stages: a roughing stand for creating the initial stepped profile and a finishing stand for precise thickness reduction. This segmentation allows each stand to be optimized for its specific function, reducing the overall complexity compared to using a single complex system with multiple offset rollers
Solution Approach 2:
The invention transitions from the conventional arrangement of rollers offset in the longitudinal direction to a transverse arrangement where partial rolls are positioned side-by-side. This dimensional change in roller arrangement enables wider step processing without increasing the number of rollers in the rolling direction, thereby reducing device complexity
2Manufacturing precision
If conventional rolling methods are used to reduce step heights, then thickness reduction is achieved, but corrugations and waves form on the metal strip surface
Solution Approach 1:
The roughing stand performs a preliminary action by creating a stepped pre-profile that approximates the target thickness distribution. This preliminary shaping allows the finishing stand to work with smaller, more controlled reductions that prevent surface corrugations while achieving the final precise thickness
Solution Approach 2:
The invention applies different rolling conditions to different regions of the metal strip through the stepped pre-profile. Each step region receives a customized reduction amount tailored to its local requirements, ensuring uniform material flow and preventing wave formation while achieving the desired final thickness distribution
3Device complexity
If fewer partial rolls are used in a transverse arrangement, then device complexity and cost are reduced, but the capability to create varied stepped profiles is limited
Solution Approach 1:
The system incorporates adjustable mechanisms that allow the partial rolls and supporting device to dynamically change their positions and configurations. This enables a limited number of physical rollers to create multiple different stepped profiles by adjusting the roll gaps, thereby maintaining versatility without increasing device complexity
Solution Approach 2:
The roughing stand creates a preliminary stepped profile that serves as a template for the finishing stand. This two-stage approach allows the system to handle varied profile requirements with fewer rollers, as the first stand prepares the material in a configuration that facilitates the second stand's precise reduction operations
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 method allows for the reduction of step heights in metal strips while maintaining a wave-free surface, reducing construction costs and improving processing efficiency by using fewer rollers and ensuring uniform material distribution.
Implementation Method 1
the two publications recommend longitudinal rolling of the metal strip, which originally typically has a rectangular cross-section, with several pressure rollers arranged offset in the rolling direction. The pressure rollers arranged offset or next to one another in the transport direction of the metal strip each press into the metal strip supported by a support device and thus deform it as desired in the width direction.
Data Source
Figure 1~3b
Figure 4~6
AI summary
The invention relates to a rolling stand, a rolling train and a method of rolling a metal strip preprofiled in a stepped manner. In order to ensure that the metal strip is free from corrugations in the longitudinal direction of the metal strip even after a thickness reduction with respect to individual steps, it is proposed according to the invention that the thickness reduction be carried out with respect to specific steps while taking into account the following mathematical interrelationship: ?hj/hj = ?hi+i/hi+1 = e = constant, where ?hj represents the amount of thickness reduction in the region of the ith step and h? represents the size of the resulting thickness of the metal strip 200 after the rolling in the region of the ith step.