Stamping Tool Structure with Milling and Laser Precision Finishing
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Solution Overview
Problem
The challenge in mass-producing bipolar plates for fuel cells lies in achieving high accuracy and surface quality in stamping tools, as existing machining methods like milling have limitations in precision, particularly for complex geometries such as slots and cavities with straight sidewalls.
Innovation Solution
A method combining milling and laser-ablation machining processes, where an intermediate geometry is defined to allow for selective machining by different processes to achieve the target geometry, with laser machining used for high-precision corrections to ensure accuracy and surface quality, particularly in slot depths, to optimize machining efficiency and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If milling is used to machine the stamping tool, then high surface quality and fast machining are achieved, but machining precision for tiny structures is insufficient
Solution Approach 1:
The machining process is divided into two distinct stages: roughing stage using milling for high productivity, and finishing stage using laser ablation for high precision. This segmentation allows each process to optimize for its strength - milling removes bulk material quickly while laser ablation achieves the required accuracy for tiny structures
Solution Approach 2:
The patent replaces the mechanical milling system with a laser-based ablation system for the finishing operation. This substitution enables achievement of higher precision for tiny structures by using photon-matter interaction instead of mechanical cutting, which has inherent limitations in precision for small features
2Manufacturing precision
If only laser machining is used to achieve high precision, then accuracy is improved, but machining efficiency decreases
Solution Approach 1:
The machining process is divided into two distinct stages: roughing stage using milling for high productivity, and finishing stage using laser ablation for high precision. This segmentation allows each process to optimize for its strength - milling removes bulk material quickly while laser ablation achieves the required accuracy for tiny structures
Solution Approach 2:
Instead of using laser machining for the entire structure, the patent applies it only partially - specifically for the tiny structures that require high precision. The bulk of the material removal is done by milling, and laser ablation is applied selectively to achieve the required accuracy only where necessary
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 enhances the accuracy and surface quality of stamping tools, improving the production of bipolar plates with precise slot geometries, leading to improved corrosion resistance and cost-effective production of fuel cell components.
Implementation Method 1
selectively machining the structure of the intermediate part by a second type of machining different than the first type of machining in accordance with the computed machining path to obtain a final part having the structure with the target geometry
Data Source
AI summary
A method of manufacturing a stamping tool having a structure, in particular a stamping tool for producing a bipolar plate for a fuel cell. The method includes selectively machining the structure of the intermediate part by a second type of machining different than the first type of machining in accordance with the computed machining path to obtain a final part having the structure with the target geometry by removing the material on the intermediate part to eliminate the difference between the machined intermediate part geometry and the target geometry.