Conical Engagement Pins for Accurate Bipolar Plate Sheet Handling
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Solution Overview
Problem
The challenge in producing bipolar plates lies in maintaining dimensional accuracy and increasing production speed, as thin sheet metals with high strength are unstable and prone to deformation during punching and forming, leading to reduced precision and slower manufacturing processes.
Innovation Solution
A gripping device with conical engagement pins that provide form-fitting engagement and prestressing of the sheet metal, ensuring accurate centering and holding, even for thin sheets, allowing for improved handling and transportation between tooling stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional gripping devices are used to hold thin sheet metal, then the sheet can be gripped, but the sheet sags and collides with the tool during transport, losing positional accuracy
Solution Approach 1:
The sheet metal is prestressed in advance during gripping, creating tensile forces that prevent sagging during transport. The conical engagement pins apply force before transport begins, maintaining dimensional stability throughout the process
Solution Approach 2:
The conical shape of the engagement pins changes the physical interaction parameters by distributing contact forces across a tapered surface. This geometric parameter change enables effective gripping and centering of thin sheets without causing deformation
2Stability of the object's composition
If sheet metal is held at every non-punched and non-deformed point, then positional stability is improved, but the complexity and effort required increases greatly
Solution Approach 1:
Instead of contacting the entire sheet surface, the gripping device segments the support function into discrete engagement pins that contact only specific bore locations. This reduces complexity while maintaining stability through strategic point contact
Solution Approach 2:
The engagement pins act as intermediary elements that transfer gripping forces through the sheet metal at critical points. These pins mediate between the gripping device and the sheet, providing stability without requiring complex full-surface contact mechanisms
3Productivity
If punching and forming operations are performed on thin sheet metal, then bipolar plates are produced, but material flows towards the tool causing dimensional inaccuracy
Solution Approach 1:
The sheet metal is prestressed with tensile forces before punching and forming operations begin. This preliminary anti-action counteracts the natural tendency of material to flow towards the tool during deformation, maintaining dimensional accuracy throughout the production process
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 solution enhances dimensional accuracy and reduces material flow issues during punching and forming, enabling faster production of bipolar plates with improved precision and reduced scrap, while allowing for efficient transportation and handling of thin sheet metals.
Implementation Method 1
the outer surface section formed by the cone serves to center the sheet when engaging
Data Source
Figure 1~3B
AI summary
A gripping device (10) for gripping at least one sheet (42) having a thickness (44) of less than 1 mm, preferably 0.5 mm, 0.25 mm or 0.1 mm, and at least two bores (46) is proposed in a tooling device (50) for the indexed production of a bipolar plate (40) from the sheet (42) along a production direction (X), wherein at least two engagement pins (14) opposite each other transverse to the production direction (X) are provided, wherein the engagement pins (14) are provided for positive engagement along each engagement axis (E) or path of movement of an engagement pin (14) into the sheet (42), which in particular, at least approximately, extends normal to the sheet (42), and wherein at least one of the engagement pins (14) has an outer surface section (18) extending conically with respect to the engagement axis (E) for centering the sheet. (42) during intervention.