Electrically-Assisted Sheet Metal Springback Reduction
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Solution Overview
Problem
Single point incremental forming (SPIF) of sheet metal often results in springback, leading to less than desired shapes due to residual stresses, which are not visible until the metal is unclamped from the fixture.
Innovation Solution
Applying electrical pulses through a pair of electrodes to the shaped component, while still clamped, reduces springback by targeting areas of maximum residual stress, thereby minimizing shape deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If single point incremental forming is used to form sheet metal, then the desired shape can be formed, but springback occurs leading to shape deviation
Solution Approach 1:
The patent applies electrical current pulses to change the physical state of the sheet metal by heating it locally, which modifies the material parameters (temperature, electrical conductivity) to reduce springback and improve shape accuracy during incremental forming
Solution Approach 2:
The patent uses periodic electrical current pulses applied during the incremental forming process to continuously manage residual stresses and springback, rather than a single static intervention
2Manufacturing precision
If electrical current pulses are applied to reduce springback, then shape accuracy improves, but process complexity increases
Solution Approach 1:
The patent introduces electrical current as an intermediary energy form to mediate between the mechanical forming process and the material's residual stresses, providing a new mechanism to control springback without fundamentally redesigning the entire forming system
Solution Approach 2:
The patent substitutes part of the mechanical control system with an electrical field-based system, using electrical current pulses to influence material behavior and reduce springback, thereby simplifying the overall control mechanism for shape accuracy
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 electrically-assisted manufacturing process reduces springback to less than 50% of the original amount, resulting in a more accurate and desired shape.
Implementation Method 1
The piece of sheet metal is plastically deformed while it is rigidly clamped to the clamping fixture and a shaped component is formed
Implementation Method 2
a pair of electrodes configured to pass electrical current from one electrode to another electrode is used to apply one or more pulses of electrical current at one or more locations on the shaped component
Data Source
AI summary
A process for forming a sheet metal component. The process includes rigidly clamping a piece of sheet metal to a clamping fixture and plastically deforming the sheet metal to produce a shaped component during a first manufacturing step. The shaped component has a first amount of springback. During a second manufacturing step, a pair of electrodes applies one or more pulses of electrical current at one or more locations on the shaped component while the shaped component is still rigidly clamped to the clamping fixture during. The one or more pulses of electrical current applied to the shaped component provide an electrically-assisted manufactured (EAM) shaped component. The EAM shaped component has a second amount of springback that is less than the first amount of springback.