Stamped Part Defect Detection via Force Profile Analysis
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Solution Overview
Problem
Current methods for detecting abnormalities in stamped parts during die operations fail to identify the type and location of defects, leading to inefficiencies in quality control and corrective measures.
Innovation Solution
A system that measures forces during stamping operations and compares them to a profile of properly stamped parts, including defective profiles, to detect and analyze defects such as wrinkles or splits, determining the root cause and location of the issue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If visual inspection is used to detect abnormalities in stamped parts, then defect detection is possible, but the inspection process becomes time-consuming and subject to human error
Solution Approach 1:
The patent replaces manual visual inspection with an automated force measurement system. Sensors mounted on the die measure forces during stamping operations, and a processor analyzes these forces to detect defects. This mechanical measurement system eliminates human error and significantly reduces inspection time while maintaining high reliability in defect detection.
Solution Approach 2:
The patent introduces force measurements as an intermediary parameter to detect defects. Instead of directly observing the stamped part for defects, the system measures forces during the stamping process and compares them against reference profiles. This indirect measurement method enables automated, rapid detection of abnormalities such as wrinkles, splits, and thinning without requiring visual inspection of the final part.
2Reliability
If force measurements are taken during stamping operations, then defect detection capability is improved, but the ability to identify the type and location of defects is insufficient
Solution Approach 1:
The patent divides the stamping process into multiple measurement points and segments the force data by die location and timing. Sensors are positioned at different locations on the die to measure forces at specific points during the stamping cycle. This segmentation of measurement data allows the system to identify not only that a defect exists but also its type and location by analyzing which specific force measurements deviate from the reference profile.
Solution Approach 2:
The patent implements a feedback mechanism where force measurements are continuously compared against reference profiles of properly stamped parts. When deviations are detected, the system provides feedback about the nature of the defect based on the pattern of force variations. This feedback loop enables identification of defect types (wrinkles, splits, thinning) and their locations by analyzing which force measurements differ from the reference.
3Measurement precision
If comprehensive force profiles are established for properly stamped parts, then defect detection accuracy is improved, but the complexity of the system increases
Solution Approach 1:
The patent performs preliminary action by establishing reference force profiles for properly stamped parts before production begins. These reference profiles, which include force measurements at multiple points during the stamping cycle, are stored in memory and used as benchmarks for quality control. By preparing these references in advance, the system achieves high defect detection accuracy without requiring complex real-time analysis algorithms during production.
Data Source
AI summary
A system and method for detecting a defective part and the type of defect formed during stamping operations. The system and method will not only detect the defect but also the nature of the defect and the time at which the defect occurred during stamping operations. Such information is useful not only in quality control but also in isolating a problem which may exist in stamping operations and thus eliminating time for isolating such problems and correcting them. The system and method uses a profile of a properly stamped part to detect a defect, and the root cause of the defect.