Electromagnetic Forming of Metal Bipolar Plates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing electromagnetic forming processes for metal bipolar plates in proton exchange membrane fuel cells face challenges such as non-uniform impact force, wrinkles, and regional rebound, leading to poor flatness and accuracy in forming microflow channels.
Innovation Solution
The method involves a forming step where a workpiece is side-press restrained and accelerated by a uniform electromagnetic force to collide with a mold, with deceleration blocks at the ends to control speed and prevent wrinkles, and a shaping step to ensure precise fitting, using a combined magnetic field and workpiece current for temperature control, and a forming device with a coil frame, side-press device, and deceleration blocks to achieve uniform speed and flatness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional stamping and forming methods are used to create microflow channels, then the channels can be formed, but the processing process becomes difficult and complicated with increased costs
Solution Approach 1:
The patent replaces traditional mechanical stamping and forming systems with an electromagnetic forming system. A pulsed electromagnetic field is generated by a coil to accelerate a conductor plate, which then impacts the workpiece to form microflow channels. This substitution eliminates complex multi-step mechanical molding processes while achieving precise channel formation through controlled electromagnetic acceleration and impact.
2Productivity
If electromagnetic forming is used to increase forming limit and reduce processing procedures, then productivity improves, but controlling the forming process to achieve high-precision and high-flatness becomes difficult
Solution Approach 1:
The patent applies local quality by positioning deceleration blocks at specific locations (both ends and middle of the mold) to create localized deceleration zones. This allows different regions of the workpiece to experience different deceleration forces during impact, enabling precise control over the forming process to achieve uniform flatness across the entire bipolar plate surface while maintaining high forming efficiency.
Solution Approach 2:
The patent implements a feedback control mechanism where deceleration blocks are strategically positioned to provide real-time deceleration feedback during the electromagnetic forming process. When the workpiece contacts these blocks during high-speed impact, the blocks modulate the deceleration force to prevent excessive deformation and rebound, thereby controlling the final flatness and shape precision of the formed bipolar plate.
3Force
If the workpiece is accelerated to high speed for electromagnetic forming, then the impact force increases, but non-uniform speed distribution causes non-uniform impact force and poor flatness
Solution Approach 1:
The patent segments the deceleration function by placing multiple deceleration blocks at different locations (both ends and middle of the mold) rather than using a single deceleration mechanism. This segmentation allows different regions of the high-speed workpiece to be decelerated independently and uniformly, ensuring even impact force distribution across the entire workpiece surface while maintaining the benefits of high-speed electromagnetic forming.
4Manufacturing precision
If the workpiece collides with the mold at high speed, then forming depth increases, but rebound and wrinkles occur that affect flatness
Solution Approach 1:
The patent employs beforehand cushioning by positioning deceleration blocks in advance at critical locations on the mold surface. These blocks act as cushioning elements that gradually decelerate the high-speed workpiece during impact, preventing sudden rebound and wrinkle formation. This pre-positioned cushioning allows the workpiece to achieve sufficient forming depth while maintaining surface flatness through controlled deceleration.
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 enables the production of bipolar plates with uniform and high-speed impact, reduced rebound and wrinkles, and improved flatness, achieving deeper flow channels and accurate shaping, thus enhancing the manufacturing efficiency and quality of metal bipolar plates.
Implementation Method 1
Electromagnetic forming is a high-speed forming method that uses an electromagnetic force to accelerate a workpiece from static to hundreds of meters per second within hundreds of microseconds to collide with a mold
Implementation Method 2
The first workpiece is controlled to tend toward the mold under the drive of a uniform electromagnetic force and accelerate to be deformed
Implementation Method 3
using a combined magnetic field and workpiece current for temperature control
Data Source
AI summary
Electromagnetic manufacturing method and forming device of mesoscale plate are provided. The manufacturing method includes: oppositely and parallelly disposing a first workpiece to be formed on top of a mold, side-press restraining two ends of the first workpiece, and disposing a deceleration block on two sides of the mold; controlling the first workpiece to tend toward the mold and to be deformed under the drive of uniform electromagnetic force; and colliding a middle area of the first workpiece firstly with the mold under the drive of uniform electromagnetic force, and driving the speed of the middle area of the first workpiece to decelerate to zero. When an area close to the two ends collides with the deceleration block and until the speed of all areas of first workpiece decelerates to zero, forming is completed. Shaping is tending further toward the mold through electromagnetic force until completely fitted to the mold.