Sheet Metal Bend Deduction from Direct Leg-Length Measurement
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Solution Overview
Problem
Existing methods for determining the shortening of sheet metal workpieces during bending are complex and lack accuracy, particularly in predicting compression and stretching effects due to multiple influencing factors.
Innovation Solution
A method that estimates shortening by determining tangent and edge shortening using specific formulas and measurements, such as distances A, B, C, and D, without requiring the determination of length H3 or bending angles, utilizing a measuring arrangement with 90° angled measuring elements to simplify the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional methods are used to determine shortening by measuring length H3 and bending angles, then measurement precision can be achieved, but device complexity and ease of operation deteriorate due to requiring multiple measurements and calculations
Solution Approach 1:
The patent extracts only the essential measurement elements needed for shortening determination. Instead of measuring multiple parameters (length H3, bending angles alpha), the method extracts and measures only the leg lengths A1, A2 directly from the bent workpiece, eliminating unnecessary measurements and simplifying the measuring arrangement.
Solution Approach 2:
The patent inverts the traditional measurement approach. Rather than measuring the bent configuration and calculating original dimensions, the method directly measures the leg lengths of the bent workpiece and uses these measurements to determine shortening, reversing the conventional measurement sequence to achieve simplicity.
2Loss of information
If traditional methods measure multiple parameters including length H3 and bending angles, then comprehensive data is obtained, but ease of operation worsens due to multiple measurement steps
Solution Approach 1:
The patent extracts only the critical information needed for shortening determination. By measuring only the leg lengths A1 and A2 of the bent workpiece, the method obtains sufficient data without requiring comprehensive measurements of all geometric parameters, thus simplifying operation while retaining essential information.
Solution Approach 2:
The patent uses the bent workpiece itself as a reference for measurement. By measuring the leg lengths directly from the bent configuration rather than creating separate measurement setups or calculations, the method simplifies the operation while capturing the necessary bending characteristics.
3Manufacturing precision
If complex calculation methods are used to account for compression and stretching effects, then manufacturing precision can be improved, but productivity deteriorates due to increased calculation time
Solution Approach 1:
The patent replaces complex mechanical calculation methods with a simplified measurement and calculation approach. Instead of calculating compression and stretching effects through multiple influencing factors, the method directly measures leg lengths and applies a simple formula, substituting complex mechanical analysis with direct measurement and basic calculation.
Solution Approach 2:
The bent workpiece itself provides the measurement data needed for shortening determination. By measuring the leg lengths directly from the bent configuration, the workpiece serves its own measurement purpose, eliminating the need for external calculation systems or additional measurement equipment, thus improving both precision and productivity.
Data Source
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AI summary
The invention relates to a method for estimating the length reduction of a sheet metal workpiece which is bent about n bending axes and by n bending angles alpha, having the following step: the bent sheet metal workpiece comprises n+1 limbs which extend along an extension line and n curved regions which are produced by bending the sheet metal workpiece and extend between two adjacent limbs.