Springback Evaluation via Sectional Shape Orientation
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Solution Overview
Problem
Current methods for evaluating springback in press forming products lack objectivity and accuracy, particularly in determining the extent of torsion and camber, leading to inconsistent countermeasures and difficulties in completely eliminating torsional torque.
Innovation Solution
A computer-based method that sets section planes at predetermined intervals to evaluate springback by comparing sectional shapes and orientations before and after die release, using objective indices such as second moment of area and section modulus directions, and position identifying point coordinates to quantify torsion and camber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If numerical simulation by FEM is used to evaluate springback, then springback analysis can be performed, but the evaluation lacks objectivity and accuracy particularly in determining torsion and camber
Solution Approach 1:
The press forming product is divided into multiple cross-sections along its longitudinal direction. Each cross-section is independently analyzed to extract sectional shapes and determine their orientations. This segmentation allows torsion and camber to be evaluated locally at each section, making the complex global deformation problem manageable and objectively measurable.
Solution Approach 2:
The invention transitions from evaluating springback in the original three-dimensional space to analyzing two-dimensional cross-sectional shapes. By extracting sectional shapes from 3D data and analyzing their orientations in 2D planes, the method simplifies the measurement of complex spatial deformations like torsion and camber, enabling more accurate and objective evaluation.
2Extent of automation
If conventional springback evaluation methods are used, then evaluation can be performed, but the results depend on operator judgment and lack objectivity
Solution Approach 1:
The invention replaces subjective operator judgment with automated computational analysis. The method uses computer-based processing to extract sectional shapes, determine their orientations, and calculate springback amounts objectively. This substitution of manual evaluation with automated computational methods eliminates operator dependency and ensures consistent, objective results.
Solution Approach 2:
The evaluation system performs self-assessment by automatically analyzing its own measurement data. The computer-based system extracts sectional shapes, determines orientations, and calculates springback without requiring external operator intervention or judgment. This self-service capability ensures complete objectivity and reproducibility of the evaluation results.
3Weight of moving object
If thinner steel sheets are used to reduce part weight, then weight reduction is achieved, but springback deformation increases
Solution Approach 1:
The invention provides detailed feedback on springback characteristics by evaluating torsion and camber at multiple cross-sections along the press forming product. This sectional feedback approach identifies specific locations and magnitudes of springback deformation, enabling targeted countermeasures to be implemented in the die design or forming process to compensate for the increased springback in thinner materials.
Data Source
AI summary
A springback amount evaluation method evaluates an amount of springback after die release of a press forming product by a computer and includes: setting a plurality of section planes intersecting a shape of the press forming product at predetermined intervals; obtaining a sectional shape of the press forming product for each of the set section planes; and obtaining an orientation of each of the sectional shapes in each section plane as a direction of the each of the sectional shapes, wherein for each of a shape to be a reference of the press forming product and a shape after the die release, the above-described three steps are performed, and the amount of springback is evaluated by comparing, for all of the section planes, the obtained directions of the sectional shapes for the shape to be the reference and for the shape after the die release.