Deformed Rebar Bending With Multi-Angle Springback Prediction
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Solution Overview
Problem
Existing methods for predicting springback in deformed reinforcing bars, which have non-uniform cross-sections, are inaccurate due to variations in bending behavior based on mounting mode, bending position, and other factors.
Innovation Solution
A method involving a reinforcing bar bending device that measures the springback amount by rotating the effort member to predetermined and subsequent bending angles, allowing for the prediction of the springback relationship based on these measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing springback prediction methods are used for deformed reinforcing bars, then the prediction process is simple, but the prediction accuracy deteriorates due to non-uniform cross-section and mounting variations
Solution Approach 1:
The patent applies preliminary action by performing multiple bending angle measurements at different bending angles (first bending angle measurement step and second bending angle measurement step) before final springback calculation. This preliminary multi-angle measurement process captures the non-linear bending behavior of deformed reinforcing bars, enabling accurate springback prediction while accounting for mounting variations and cross-section non-uniformity
Solution Approach 2:
The patent implements feedback by using the measured bending angles from multiple measurement steps to calculate and adjust the springback amount. The calculated springback amount is then fed back to determine the appropriate bending angle for actual bending operations, creating a closed-loop system that continuously improves prediction accuracy based on measured results
2Manufacturing precision
If bending is performed without accurate springback prediction, then the process is faster, but the bending precision deteriorates and fails to achieve target angles
Solution Approach 1:
The patent performs preliminary springback characterization by conducting bending angle measurements at multiple predetermined bending angles before actual production bending. This preliminary data collection establishes the relationship between bending angle and springback amount, enabling accurate target angle calculation for subsequent bending operations without requiring real-time iterative adjustments
Solution Approach 2:
The patent changes the parameter of bending angle to multiple predetermined values (first bending angle and second bending angle that is greater than the first) during measurement. By measuring springback at different bending angle parameters, the method captures the non-linear behavior of deformed reinforcing bars and establishes an accurate springback model for predicting target angles
3Shape
If springback is not considered in bending, then the operation is simpler, but the resulting shape deviates from the target configuration
Solution Approach 1:
The patent applies preliminary anti-action by calculating the springback amount in advance and compensating for it in the target bending angle determination. The system measures bending angles at multiple steps, calculates the springback amount based on these measurements, and then determines a corrected target bending angle that accounts for the expected springback, thereby achieving accurate final configuration
Solution Approach 2:
The patent replaces complex mechanical trial-and-error bending adjustments with a calculation-based springback prediction system. By using measured bending angle data from multiple measurement steps to calculate springback amount and determine target angles, the method substitutes iterative mechanical adjustments with a deterministic calculation approach
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 accurate prediction of springback in deformed reinforcing bars, reducing errors and allowing for precise bending to target angles.
Implementation Method 1
springback occurs during bending of a metal member
Data Source
AI summary
There are provided a method for predicting a springback amount and a method for bending a deformed reinforcing bar including: supplying the deformed reinforcing bar bending the supplied deformed reinforcing bar, and subsequently measuring a first bending angle in a state of releasing a bending force on the deformed reinforcing bar; further bending the reinforcing bar from which the bending force has been released, and subsequently measuring a second bending angle in a state of releasing the bending force; and predicting a relationship between the bending angle and the springback amount by using the measurement results after executing the further bending once or a plurality of times, in which the bending angle is greater for subsequent steps.