Springback Analysis Using Natural Vibration Modes
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Solution Overview
Problem
High-strength steel sheets used in automobile bodies face challenges such as increased springback and reduced ductility, making it difficult to ensure dimensional accuracy during press forming, and existing methods for addressing springback are inefficient and costly.
Innovation Solution
An analyzing apparatus and method that uses finite element modeling to identify and select natural vibration deformation modes corresponding to springback, and optimally dispose beads to increase natural frequencies, thereby reducing deformation and improving dimensional accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high-strength steel sheets are used to increase tensile strength, then energy absorption and strength are improved, but springback increases making dimensional accuracy difficult to ensure
Solution Approach 1:
The patent applies natural vibration analysis to identify deformation modes that occur during springback. By analyzing the natural vibration characteristics of the formed product, the system can predict springback behavior and determine optimal bead reinforcement positions to counteract these vibrations and reduce dimensional inaccuracy.
Solution Approach 2:
The patent changes physical parameters by adding beads (rigidity reinforcement portions) to the formed product. These beads modify the structural parameters such as moment of inertia and rigidity at critical locations, thereby reducing springback and improving dimensional accuracy while maintaining the high-strength material properties.
2Measurement precision
If manual selection of natural vibration deformation modes is performed, then accurate springback analysis is possible, but time consumption and cost increase
Solution Approach 1:
The patent implements an automated system where the analyzing apparatus independently performs natural vibration analysis, identifies relevant deformation modes, and determines optimal bead reinforcement positions without requiring manual intervention. The system self-services the entire analysis process, from data acquisition to generating reinforcement recommendations.
Solution Approach 2:
The patent replaces manual mechanical analysis methods with automated computational analysis. By using computer-based natural vibration analysis and finite element methods, the system substitutes human experts' manual work with automated algorithms, significantly reducing analysis time while maintaining or improving accuracy.
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
Enables easy selection of natural vibration deformation modes and effective analysis for reducing springback-induced deformation, improving the dimensional accuracy of high-strength steel parts with reduced costs and complexity.
Implementation Method 1
Springback is elastic deformation which occurs in a part to satisfy a new balance with a residual stress being a driving force
Implementation Method 2
a natural vibration analyzing unit which obtains by the finite element method a displacement of a node of the finite element model data with respect to each of a plurality of natural vibration deformation modes
Data Source
AI summary
An analyzing apparatus generates first displacement distribution data indicating a displacement distribution of a member caused by springback based on finite element model data, material physical property data, and stress distribution data; generates second displacement distribution data indicating an amount of displacement of the member in each of a plurality of, for example, all, natural vibration deformation modes based on the finite element model data and the material physical property data; obtains a degree of coincidence between the first displacement distribution data and each of the second displacement distribution data, and selects one or more natural vibration deformation modes based on the degree of coincidence, to determine a modified shape in which natural vibrations are increased, thereby bringing the member closer to a target shape.