Compressive Stress Forming for Low-Springback Metal Parts
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing metallic part forming processes often result in 'springback' due to residual stress, leading to dimensional instability, increased manufacturing costs, and reduced customer confidence.
Innovation Solution
A method and system that determine target locations for excess material based on electronic modeling, allowing the excess material to flow in specific directions during forming to reduce residual stress and springback behavior, using a forming tool with contacts and dies to unconstrain as-cut end surfaces and apply controlled forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional forming processes are used, then manufacturing simplicity is maintained, but residual stress and springback occur leading to dimensional instability
Solution Approach 1:
The method introduces a pre-forming operation before the final forming step. During pre-forming, excess material is strategically positioned at target locations (such as bend regions) to create a compensatory geometry. This preliminary action allows the material to flow in controlled directions during subsequent forming, counteracting residual stress and reducing springback, thereby improving dimensional stability without excessive process complexity
Solution Approach 2:
The invention applies local quality by creating non-uniform material distribution through the pre-forming step. Excess material is concentrated at specific target locations (e.g., bend areas between base and sidewall) rather than uniformly distributed. This localized material accumulation enables controlled plastic deformation and stress redistribution in critical regions, reducing springback at these specific locations while maintaining overall process feasibility
2Manufacturing precision
If excess material is added to reduce springback, then dimensional stability improves, but material usage efficiency decreases
Solution Approach 1:
The method strategically discards minimal excess material in controlled locations during pre-forming, then recovers its beneficial effect by allowing this excess material to flow during forming to counteract springback. The excess material serves a functional purpose (stress compensation) rather than being pure waste, and any truly excess material beyond what's needed for springback compensation can be trimmed after forming, minimizing net material loss while achieving dimensional stability
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
The method effectively decreases residual stress and reduces springback in metallic parts, improving dimensional stability and reducing manufacturing costs by minimizing dimensional variability and quality control loops.
Implementation Method 1
causing the excess material to flow in one or more specific directions during forming to decrease the residual stress in the metallic part
Implementation Method 2
This shape change is commonly referred to as 'springback', and can be caused by residual stress that remains in a metallic part after processing
Implementation Method 3
contacting the metallic part for forming at one or more contact locations away from as-cut end surfaces
Implementation Method 4
The predicted stresses comprise tensile stresses caused by material deformation, and compressive stresses in local areas of the metallic part induced by the excess material
Data Source
AI summary
The present disclosure relates to forming a metallic part to decrease residual stress and reduce springback behavior in the metallic part after forming. Target locations in the metallic part for excess material are determined based on electronic modelling prior to forming. The excess material in the target locations is configured to decrease residual stress in the metallic part after forming. The metallic part is contacted for forming at one or more contact locations away from as-cut end surfaces of the metallic part, such that the as-cut end surfaces are unconstrained during forming. The excess material is caused, based on the one or more contact locations and the excess material at the one or more target locations, to flow in one or more specific directions during forming to decrease the residual stress in the metallic part and reduce springback behavior in the metallic part after forming.