Roll-Bending Pushing Roll Position Control for Variable Curvature
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Solution Overview
Problem
Existing roll-bending processing methods struggle with accurately forming complex shapes and handling minute changes in processing conditions, such as clearance variations in machine assembly and material curvature, leading to deviations in the formed radius of curvature.
Innovation Solution
A roll-bending method that calculates reference data from stationary bending experiments to determine the operation amount of the pushing roll, allowing for continuous feeding and precise control of the bending process, even with changing curvature designs, by using a fulcrum roll, pressing roll, and pushing roll arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional roll-bending processing methods are used with fixed pushing roll positions, then simple constant curvature shapes can be formed, but complex shapes with changing radii of curvature cannot be accurately formed due to springback variations
Solution Approach 1:
The pushing roll position is made dynamically adjustable rather than fixed. The control unit varies the pushing roll position along the feeding direction based on the design shape requirements, enabling accurate formation of complex shapes with changing radii of curvature while compensating for springback variations at different positions
Solution Approach 2:
The system changes the positional parameter of the pushing roll dynamically during processing. By adjusting the pushing roll position according to the curvature requirements at different sections of the workpiece, the system achieves accurate formation of complex shapes that require varying radii of curvature
2Ease of manufacture
If experimental methods with average springback ratios are used, then processing can be simplified, but accuracy deteriorates due to minute changes in machine assembly clearance and material characteristics
Solution Approach 1:
The system incorporates feedback through pre-measurement of springback at multiple positions and uses this data to dynamically adjust the pushing roll position. The control unit calculates the actual pushing roll position based on measured springback characteristics, compensating for variations in machine clearance and material properties to achieve high precision
Solution Approach 2:
Springback measurements are performed in advance at multiple positions before actual processing. These preliminary measurements are stored and used to calculate the optimal pushing roll positions, allowing the system to compensate for material and machine variations without adding complexity to the main processing operation
3Ease of operation
If the pushing roll position is fixed for constant radius of curvature, then processing is simple, but it cannot accommodate design shapes with changing radii of curvature
Solution Approach 1:
The pushing roll position transitions from a fixed static setting to a dynamic variable position system. The control unit automatically adjusts the pushing roll position along the feeding direction based on the design shape data, enabling the system to handle both constant and varying curvature designs with equal ease
Solution Approach 2:
The system achieves multi-functionality by incorporating a programmable control unit that can process various design shapes with different curvature profiles. The same apparatus can handle both simple constant radius shapes and complex varying radius shapes by simply changing the control parameters, eliminating the need for different specialized equipment
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 method enables high-accuracy bending processing that accounts for variations in machine state and material characteristics, allowing for complex shapes with changing curvatures to be formed accurately, reducing errors and improving processing precision.
Implementation Method 1
acts bending stress on a material to be processed and bends the material
Implementation Method 2
springback is generated by removal of the bending stress and a radius of curvature is changed
Data Source
AI summary
A method for deriving the position of a pushing roll, applied even when there is a difference between the actual processed shape and a theoretical solution (a numerical analysis solution) due to changes in a state of a processing machine or the bending characteristic of the material to be processed. The rolls have a pyramid-like shape, and the operation amount of a pushing roll is changed while continuously feeding a material, thereby bending the material. Also, for each position of the fixed pushing roll, the radius of curvature of the material is measured and the bending characteristic is grasped in advance. From the design shape, the radius of curvature and the operation amount for bringing the pushing roll into contact are obtained. The operation amount of the pushing roll is then determined.