Two-Step Flanging for Metal Part Dimensional Accuracy
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Solution Overview
Problem
The flanging process in metal manufacturing often results in residual stresses and dimensional instability in flanged parts due to the stretching and bending of metal, leading to distorted final shapes and potential vehicle build issues.
Innovation Solution
A two-step flanging method is introduced, where a first flanging operation forms 'metal gainers' or regions of increased material in the flange region, followed by a second operation to smooth and remove these gainers, thereby reducing stresses and achieving a more stable, dimensionally accurate final flange shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single flanging operation is performed to form a flange, then the flange is formed efficiently in one step, but residual stresses cause distortion and dimensional instability in the final part
Solution Approach 1:
The single flanging operation is divided into two separate operations: a first flanging operation that forms the flange with increased material regions, and a second flanging operation that removes the increased material to achieve the final shape. This segmentation allows each operation to be optimized for its specific function, improving overall dimensional accuracy while maintaining productivity.
Solution Approach 2:
The first flanging operation performs a preliminary forming action by creating the flange with increased material regions. This preliminary action prepares the workpiece for the second operation, allowing the increased material to be strategically placed and then removed to achieve the desired final shape with reduced residual stresses.
2Shape
If metal is stretched and bent to form a flange, then the flange shape is achieved, but residual stresses are introduced that distort the final part shape
Solution Approach 1:
The increased material regions are intentionally created and then removed in the second flanging operation. By extracting this excess material, the source of residual stresses is eliminated, allowing the flange to achieve its final shape without the distortion-causing stresses that would result from traditional single-step flanging.
Solution Approach 2:
The material distribution in the flange region is changed by introducing increased material regions during the first flanging operation. This parameter change in material distribution allows for controlled stress management, as the increased material can be strategically placed and then removed to achieve the desired final geometry with improved dimensional stability.
3Manufacturing precision
If additional metal is provided in the flange region, then dimensional accuracy can be improved, but the process complexity increases with multiple operations
Solution Approach 1:
The two flanging operations are merged into a single integrated process flow where the first operation creates the increased material regions and the second operation removes them. This merging of operations, while adding a step, creates a synergistic effect where each operation complements the other to achieve superior dimensional accuracy that would not be possible with a single operation.
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 approach effectively reduces residual stresses and ensures a consistent flange length by providing additional metal during the first flanging step, which is then smoothed out in the second step, resulting in a neutral or slightly compressed flange with improved dimensional accuracy.
Implementation Method 1
performing a first flanging operation to the flange region with a first die to form an intermediate shaped part having a region of increased material on the flange region
Implementation Method 2
performing a second flanging operation to the intermediate shaped part with a second die to remove the region of increased material
Data Source
AI summary
A method and system for flanging a metal part is provided to improve the final dimensions of the part to a desired shape. Residual stresses from flanging operations can distort a final shape of the metal part. This disclosure provides an initial flanging step in which metal gainers are formed into the metal during a first flanging step. The metal gainers provide an increased amount of metal at select regions. Then, during a next flanging step, the metal gainers are smoothened or removed during that flanging step while the metal is additionally bent. The metal gainers help combat the residual stresses and allow the flange to better take the desired shape.