Replaceable Blade Die for Consistent Soft Material Coupon Cutting
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Solution Overview
Problem
Current methods for cutting test coupons from soft materials, such as biological tissue, are either operator-dependent and prone to variations or expensive and require frequent maintenance, lacking a simple and standardized solution for achieving precise dumbbell geometry.
Innovation Solution
A cutting system featuring a blade die with interchangeable razor blades and clamping cauls that bend the blades into a dumbbell shape under compression, allowing for easy replacement and maintenance, and utilizing 3D printing for rapid fabrication and low material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If scalpels and cutting guides are used to cut test coupons, then the method is inexpensive and low-maintenance, but the resulting coupon geometry is operator-dependent and prone to large inter- and intra-specimen variations in dimensions
Solution Approach 1:
The patent employs disposable razor blades as the cutting element instead of expensive, maintainable steel punches. The blades are inexpensive, easily replaced, and eliminate the need for sharpening or maintenance. Each blade is used once or a few times and then discarded, ensuring consistent cutting performance without the cost and complexity of maintaining expensive tools.
Solution Approach 2:
The cutting system is divided into separate components: the blade die, the clamping cauls, and the interchangeable razor blades. This segmentation allows the blades to be easily replaced while keeping the expensive precision components (die and cauls) reusable. The modular design enables low-cost blade replacement while maintaining high precision through the reusable precision components.
2Manufacturing precision
If custom fabricated steel punches are used to cut test coupons, then repeatable and accurate coupon geometry is achieved, but they are expensive, require considerable time to fabricate, and need periodic maintenance to sharpen the cutting edge
Solution Approach 1:
The patent replaces expensive, maintainable steel punches with inexpensive disposable razor blades. The blades are discarded after use rather than being sharpened or maintained, eliminating the time and cost associated with maintenance while keeping the cutting function effective through frequent replacement of fresh blades.
Solution Approach 2:
The system transitions from fixed, permanent steel punches to dynamic, interchangeable razor blades. The blades can be quickly swapped out and replaced, providing adaptability and flexibility. The clamping cauls apply compression to hold the blades in place during cutting, allowing for dynamic replacement without requiring complex tooling changes.
3Ease of repair
If interchangeable blades are used in a blade die with clamping cauls, then blade replacement is simplified and maintenance is reduced, but the device structure becomes more complex with multiple components
Solution Approach 1:
The cutting device is segmented into distinct functional components: the blade die, the clamping cauls, and the interchangeable blades. This segmentation enables easy blade replacement while maintaining structural integrity. Each component has a specific function, and their modular nature allows for simple assembly and disassembly for blade changes.
Solution Approach 2:
The system incorporates dynamic elements including the removable blades and the clamping mechanism that applies compressive force. The clamping cauls can be positioned and adjusted to secure the blades, providing a simple yet effective method for blade retention that allows quick replacement without complex fastening mechanisms.
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 system provides accurate, reproducible, and cost-effective production of dumbbell-shaped coupons with minimal maintenance, supporting standardized tensile testing methods by ensuring sharp blades and precise geometry.
Implementation Method 1
The first molding surface and the third molding surface are configured to bend a first interchangeable blade positioned therebetween into a first shape in response to a first compression force between the first molding surface and the third molding surface.
Implementation Method 2
The second molding surface and the fourth molding surface are configured to bend a second interchangeable blade positioned therebetween into a second shape in response to a second compression force between the second molding surface and the fourth molding surface.
Data Source
AI summary
A system may include a blade die, a first clamping caul positioned on a first side of the blade die, and a second clamping caul positioned on a second side of the blade die. A molding surface of the blade die and a molding surface of the first clamping caul may be configured to bend a first interchangeable blade positioned therebetween into a first shape in response to a first compression force. A second molding surface of the blade die and a molding surface of the second clamping caul may be configured to bend a second interchangeable blade positioned therebetween into a second shape in response to a second compression force.