Springback Analysis Method Using Stress Decomposition
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Solution Overview
Problem
Current methods for analyzing springback in press-formed products are inadequate, making it difficult to accurately determine the cause of springback during the design stage, leading to increased time and costs in the forming process.
Innovation Solution
A method involving numerical simulation to decompose stress data into in-plane stress and bending moment components, allowing for the calculation of springback configurations and the influence of stress on deformation in specific areas, enabling more accurate analysis and visualization of springback causes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If numerical analysis by finite element method is used to estimate springback, then die configuration can be corrected, but it is very difficult to design a die through numerical analysis taking the problem of springback into consideration in a complete manner because it is a nonlinear problem
Solution Approach 1:
The patent segments the complex nonlinear springback analysis into multiple linear approximation stages. By dividing the forming process into discrete steps and performing linear analysis at each stage, the method breaks down the intractable nonlinear problem into manageable segments that can be solved sequentially, achieving complete die design consideration without overwhelming computational complexity.
Solution Approach 2:
The patent applies partial action by using linear approximation instead of complete nonlinear analysis. While linear analysis is less precise than full nonlinear analysis, it provides sufficient accuracy for practical die design when applied iteratively through multiple stages, achieving adequate springback control without the excessive computational burden of complete nonlinear simulation.
2Manufacturing precision
If opening or slit is provided in the formed product to remove residual stress, then springback can be reduced, but cutting or punching may decrease rigidity of the product itself, so only slight residual stress tends to cause great springback
Solution Approach 1:
The patent performs preliminary springback analysis through numerical simulation before actual forming. By predicting springback behavior and identifying high-risk areas in advance, the method enables proactive die configuration adjustments that prevent excessive springback without requiring post-forming modifications like openings or slits that would compromise product rigidity.
Solution Approach 2:
The patent uses numerical simulation to create a virtual model of the forming process and springback behavior. This digital copy allows for analyzing and optimizing die configuration and predicting springback without physically modifying the product with openings or slits, thereby maintaining product rigidity while achieving springback control through virtual prototyping and analysis.
3Manufacturing precision
If modification method is used to provide opening or slit in the formed product, then residual stress can be removed, but such an approach needs tests with an actual test die and a steel plate, which increases man-hours and costs at the design stage
Solution Approach 1:
The patent replaces physical mechanical testing with numerical simulation analysis. Instead of conducting repeated tests with actual test dies and steel plates to evaluate modification methods, the method uses computational models to predict springback behavior and evaluate different die configurations, eliminating the need for time-consuming physical prototypes while maintaining analysis accuracy.
Solution Approach 2:
The patent performs preliminary numerical analysis to evaluate modification methods and predict their effectiveness before committing to physical testing. By analyzing residual stress distribution and springback behavior through simulation in advance, the method identifies promising modification approaches without requiring extensive manual testing, thereby reducing design stage time and costs.
4Weight of moving object
If high-strength steel plates are used to provide thin and lightweight products, then lightweighting is achieved, but high-strength steel plates have greater deformation resistance, which may increase the likelihood of occurrence of springback
Solution Approach 1:
The patent performs preliminary springback analysis through numerical simulation specifically for high-strength steel plates. By predicting springback behavior before forming, the method enables advance adjustment of die configuration to compensate for the increased springback tendency of high-strength materials, allowing lightweighting with thin high-strength steel while maintaining dimensional accuracy through pre-corrected die design.
Solution Approach 2:
The patent adjusts die configuration parameters based on numerical analysis results to compensate for the properties of high-strength steel plates. By modifying die geometry, pressing forces, or forming parameters in the numerical model, the method optimizes the forming process for high-strength materials, reducing springback occurrence while maintaining the weight benefits of using thin high-strength steel plates.
Data Source
AI summary
A method of analyzing a cause of springback of the invention includes: performing a forming analysis to calculate forming data of a formed product; decomposing a component into an in-plane stress component and a bending moment component; generating a before-calculation individual decomposition forming data; performing a calculation to generate an after-calculation individual decomposition forming data; analyzing a first springback configuration and a second springback configuration; obtaining a degree of influence of a stress in each of the areas with respect to springback deformation; and displaying the degree of influence with respect to the springback deformation.