Sheet Roll-Rounding Control for Accurate Curvature Setting

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Solution Overview

Problem

Existing roll bending processes for thick sheets lack deterministic machine settings due to material property fluctuations, relying heavily on operator experience, leading to inefficiencies and risks of overbending and costly scrap.

Innovation Solution

A method using a control device that receives task parameters to select process-specific models for roll rounding, determining process control parameters to achieve target curvatures through a sequence of rolling operations, incorporating empirical and FE simulations to model sheet behavior accurately.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If operator adjusts machine settings based on subjective assessment and experience, then forming process can be adapted to material fluctuations, but process control efficiency decreases and reliance on operator qualifications increases

Engineering Contradiction:

Improveadaptability to material fluctuationsVSAvoidprocess control efficiency

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent replaces the mechanical/operator-based adjustment system with an automated control system that uses sensors to detect actual curvature and automatically adjusts roll positioning and feed rates. This substitutes human subjective assessment with objective measurement and automated control algorithms, eliminating dependence on operator experience while improving efficiency

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system implements closed-loop feedback by continuously measuring the actual curvature of the formed sheet metal and comparing it with target values. Based on this feedback, the control system automatically adjusts process parameters such as roll positioning and feed rate to achieve the desired curvature, enabling adaptive control without operator intervention

Inventive Principle:

Principle #23Feedback

2Manufacturing precision

If operator performs iterative forming process to approach target curvature, then overbending and scrap can be avoided, but production time increases

Engineering Contradiction:

Improvecurvature accuracyVSAvoidproduction time

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The system performs preliminary action by calculating optimal roll positioning and feed rate settings before the forming process begins, based on the desired target curvature and material properties. This pre-calculation eliminates the need for iterative adjustments during production, achieving both high precision and efficiency

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Real-time feedback during the forming process allows the system to monitor actual curvature development and make automatic corrections if deviations are detected, ensuring target curvature accuracy is achieved in a single pass without iterative retries

Inventive Principle:

Principle #23Feedback

3Productivity

If deterministic machine settings are established for desired forming result, then process control efficiency improves, but adaptability to material property variations decreases

Engineering Contradiction:

Improveprocess control efficiencyVSAvoidadaptability to material variations

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The system transitions from static deterministic settings to dynamic adaptive control. Machine settings are no longer fixed but are continuously adjusted based on real-time sensor feedback about actual curvature and material behavior, allowing the system to maintain efficiency while adapting to material variations

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The control system dynamically changes process parameters such as roll positioning, feed rate, and forming pressure based on detected material properties and actual forming progress. This parameter adaptation enables deterministic control efficiency to be maintained while accommodating material variations

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP4597242A1Method and system for rolling-rounding a sheet metal

Publication Date: 2025.08.06 FRAUNHOFER GESELLSCHAFT ZUR FORDERUNG DER ANGEWANDTEN FORSCHUNG EV

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Figure 2A~2C
Figure 3A~4

AI summary

The invention relates, among other things, to a method for roll-rounding a sheet (16) using a roll-rounding device (20), wherein: • a control device (30) receives at least one task parameter which describes a roll-rounding task to be carried out, the task parameter specifying a target curvature, • the control device (30) feeds the at least one task parameter to at least one roll-rounding process-specific model which describes a relationship between an achievable curvature and at least one process control parameter for a specific type of roll-rounding process, • the control device (30) uses the roll-rounding process-specific model to determine a setting for the at least one process control parameter to at least partially achieve the target curvature, • the roll-rounding device (30) carries out the roll-rounding task using the determined setting of the process control parameter.