Press-Formed Part Peripheral Shape Evaluation at Bottom Dead Center
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Solution Overview
Problem
Current methods for evaluating the peripheral shape of press formed parts are inaccurate and lack reproducibility, making it difficult to compare actual parts with analysis models and improve dimensional accuracy.
Innovation Solution
A method that involves generating a press formed part workpiece shape model from three-dimensional surface profile measurements, performing mechanical analysis to acquire the peripheral shape, and comparing it with a press formed part analysis model obtained through elastoplastic mechanical analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the peripheral shape of actual press formed part is compared with peripheral shape of press formed part analysis model after springback, then the comparison can be performed, but the accuracy is low because the shapes do not necessarily match due to differences in lubricating oil, material strength, and other factors
Solution Approach 1:
The patent performs preliminary springback analysis on the press formed part analysis model before comparison with the actual press formed part. By predicting and compensating for springback deformation in advance, the analysis model is adjusted to match the actual part's peripheral shape more accurately, thereby improving both measurement precision and reproducibility of the comparison results
Solution Approach 2:
The patent introduces an intermediary comparison method that uses relative position relationships and distance measurements between characteristic points rather than direct shape overlay. This intermediary approach accounts for variations in lubricating oil, material strength, and other factors by focusing on geometric relationships that remain consistent despite material property differences
2Measurement precision
If traditional measurement methods are used to evaluate peripheral shape accuracy, then the evaluation can be performed, but the accuracy and reproducibility are insufficient due to difficulty in superposing shapes and determining measurement criteria
Solution Approach 1:
The patent replaces traditional mechanical measurement and manual superposition methods with computational analysis. By using computer-based elastoplastic mechanical analysis and automated comparison algorithms, the system eliminates the need for manual shape alignment and subjective judgment, significantly improving both measurement precision and reducing operational complexity
Solution Approach 2:
The patent changes the evaluation parameters from direct shape overlay to relative position relationships and distance measurements between characteristic points. By transforming the comparison criteria into measurable geometric parameters, the system achieves higher precision while simplifying the evaluation process through standardized parameter-based assessment
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 allows for accurate and reproducible comparison of actual and analysis model peripheral shapes, enabling improved prediction accuracy and dimensional accuracy of press formed parts.
Implementation Method 1
the shape of the press formed part after press forming is different from the shape of the forming bottom dead center in the tool of press forming due to elastic deformation called springback when the press formed part is taken out from the tool of press forming
Data Source
AI summary
A method of evaluating a peripheral shape of a press formed part includes: acquiring, as a peripheral shape of an actual press formed part, a peripheral shape of a press formed part workpiece bottom dead center shape model acquired by mechanical analysis in a process of sandwiching the actual press formed part that is actually press-formed and is spring-backed up to a forming bottom dead center, obtaining a press formed part analysis model by elastoplastic mechanical analysis in a process of press forming the actual press formed part, acquiring a peripheral shape at the forming bottom dead center of the press formed part analysis model, and comparing the peripheral shapes of the actual press formed part and the press formed part analysis model and evaluating each of the peripheral shapes.