Springback Cause Identification in Press-Formed Parts
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Solution Overview
Problem
Current methods for controlling springback in press-formed products, such as automobile components, are inefficient and costly due to the difficulty in numerically analyzing nonlinear deformation and the reliance on trial-and-error approaches, which often compromise product quality and increase development time.
Innovation Solution
A method using numerical analysis to identify the cause and location of springback by processing physical property values and quantities of press-formed parts, allowing for the calculation and minimization of springback values, thereby optimizing tooling design and reducing the need for costly physical tests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If numerical analysis is used to analyze springback by processing physical property values and quantities, then manufacturing precision and productivity are improved, but device complexity increases
Solution Approach 1:
The analysis system segments the press-formed part into multiple regions and processes physical property values (such as stress, strain, and material properties) for each region separately. This allows the complex springback analysis to be divided into manageable computational tasks, improving precision while managing system complexity through structured decomposition of the analysis process.
2Reliability
If trial-and-error tests with actual steel sheet and tooling are conducted, then reliability of springback control is improved, but loss of time and productivity are worsened
Solution Approach 1:
The system performs preliminary numerical analysis of springback behavior by processing physical property values before actual tooling and steel sheet tests are conducted. This preliminary action identifies potential springback issues and optimizes forming parameters in advance, reducing the need for extensive trial-and-error testing and thereby decreasing development time while maintaining reliability.
3Manufacturing precision
If physical modifications such as cutting parts or forming holes are made to reduce springback, then springback control is improved, but strength and rigidity of the formed product are worsened
Solution Approach 1:
Instead of making physical modifications to the formed product, the system changes processing parameters such as forming pressure, holding time, and material property values during the press forming process. By adjusting these parameters and reprocessing the physical property values numerically, springback is reduced without compromising the strength and rigidity of the final product.
4Weight of moving object
If high strength steel materials are used to reduce thickness, then weight is reduced, but springback control difficulty increases
Solution Approach 1:
The system applies local quality processing by assigning different physical property values (such as stress-strain characteristics and material constants) to different regions of the high strength steel sheet based on its heterogeneous material properties. This region-specific processing allows accurate springback prediction and control for each area, addressing the increased control difficulty posed by using high strength, thin-gauge materials.
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 approach enables accurate identification of springback causes and minimization of springback values, reducing development time and costs while maintaining product strength and quality, without compromising rigidity or requiring physical modifications like cutting or hole formation.
Implementation Method 1
a press forming analysis of numerically analyzing forming conditions to calculate forming data of a press-formed part
Implementation Method 2
the deformation when an elastically deformed part of steel sheet elastically recovers driven by the residual stress occurring in the steel sheet at the time of press forming
Implementation Method 3
the deformation when an elastically deformed part of steel sheet elastically recovers driven by the residual stress occurring in the steel sheet at the time of press forming, that is, the springback
Data Source
AI summary
A method of identification of a cause of occurrence of springback comprising a press forming analysis step of numerically analyzing forming conditions of press forming to obtain forming data of a press formed part, a processing step of processing at least one of a physical property value and physical property quantity data of part of the regions of said press formed part among forming data of said press formed part, and a springback value calculation step of calculating a springback value based on the results of said processing.