Separator Press Punching Sequence for Shrinkage-Sensitive Precision
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Solution Overview
Problem
In the manufacturing of fuel cell separators using a pressing machine, the precision of the second section of the separator is compromised due to press-induced deformation and shrinkage affecting the periphery of the material during die closing.
Innovation Solution
The pressing machine is configured with multiple punching units, where a first punching unit punches a first region of the material during die closing, and a second punching unit punches a second region, required to be formed with higher precision, during a subsequent die closing, thereby minimizing the impact of material shrinkage on precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple regions are punched simultaneously during one die closing action, then productivity is improved, but manufacturing precision deteriorates due to material shrinkage affecting the periphery
Solution Approach 1:
The punching process is segmented into multiple stages: a first punching unit punches a first region during initial die closing, and a second punching unit punches a second region during subsequent die closing. This segmentation allows different regions to be punched at different times, preventing material shrinkage from affecting the precision of high-precision sections while maintaining overall productivity.
Solution Approach 2:
The first punching unit performs preliminary punching on the first region before the second punching unit punches the second region. By performing the first punching action in advance, the material undergoes initial deformation and shrinkage before the high-precision punching occurs, allowing the second region to be punched with higher precision despite the preliminary action's impact on the material.
2Device complexity
If the second region is punched during the same die closing as the first region, then device complexity is reduced, but manufacturing precision deteriorates due to press-induced deformation
Solution Approach 1:
The punching units are segmented into a first punching unit and a second punching unit that operate at different times. The first punching unit is configured to punch the first region during initial die closing, while the second punching unit punches the second region during subsequent die closing. This temporal segmentation resolves the contradiction by allowing separate control of punching operations to maintain precision while using a unified pressing machine structure.
3Productivity
If punching is performed on regions requiring different precision levels simultaneously, then productivity is improved, but reliability deteriorates due to inability to maintain high precision on critical sections
Solution Approach 1:
Different punching units are assigned different functions based on the precision requirements of specific regions. The first punching unit handles regions where lower precision is acceptable, while the second punching unit is dedicated to punching the second region that requires high precision. This local quality differentiation ensures that critical sections maintain high precision while overall productivity is maintained through parallel processing capabilities.
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 configuration allows for the precise formation of the second section of the separator, as the second punching unit operates after the initial shrinkage has occurred, ensuring high precision and preventing burrs or defects.
Implementation Method 1
the material may experience shrinkage due to press-induced deformation
Data Source
AI summary
A pressing machine includes a fixed die, a movable die, and multiple punching units. The punching units include a first punching unit and a second punching unit. The first punching unit punches a first region of a material, thereby forming a first section of a separator. The second punching unit punches a second region of the material, thereby forming a second section of the separator. The pressing machine is configured such that the first punching unit punches the first region of the material at the time of die closing, and that the second punching unit punches the second region of the material at the time of subsequent die closing.