RF Welding Contoured Objects Using Soft Tooling
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Solution Overview
Problem
Radio frequency welding of contoured dielectric components faces challenges in ensuring consistent pressure application and even energy distribution due to complex surfaces, often requiring costly custom tooling or shims, which can slow down manufacturing.
Innovation Solution
The method employs 'soft' tooling comprising a non-dielectric, elastically-deformable component and a wire mesh component to distribute pressure and transmit radio frequency energy evenly across contoured surfaces, allowing for reliable welds without the need for custom tooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dedicated tooling with custom mold cavities is used to ensure consistent pressure on contoured components, then weld quality is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The patent uses a flexible sheet positioned between the contoured component and the forming tool. This flexible sheet conformally contacts the contoured outer surface of the component, distributing pressure evenly across the weld area without requiring custom mold cavities. The flexibility allows it to adapt to complex geometries while maintaining simple tooling structure.
Solution Approach 2:
The flexible sheet acts as an intermediary element between the forming tool and the contoured component. It mediates the pressure transmission, ensuring uniform contact and pressure distribution across the contoured surface without requiring the forming tool itself to be custom-shaped.
2Manufacturing precision
If shims are fitted between flat tooling and contoured components to improve pressure distribution, then weld quality is improved, but manufacturing time and complexity increase
Solution Approach 1:
Instead of using multiple rigid shims that require fitting and adjustment, the patent employs a single flexible sheet that automatically conformally contacts the contoured surface. This eliminates the time-consuming process of shim selection and arrangement while achieving uniform pressure distribution.
Solution Approach 2:
The flexible sheet dynamically adapts to the contoured surface geometry through elastic deformation, allowing it to conform to various shapes without requiring pre-arranged static shims. This dynamic adaptation reduces setup time and simplifies the manufacturing process.
3Device complexity
If flat tooling is used for contoured components, then tooling simplicity is maintained, but pressure distribution and weld quality deteriorate
Solution Approach 1:
The flexible sheet serves as an interface layer that enables simple flat tooling to effectively weld contoured components. The sheet conformally contacts the contoured surface, distributing pressure evenly, while the tooling itself remains simple and non-customized.
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 consistent and efficient radio frequency welding of contoured dielectric objects using relatively simple tooling, ensuring strong welds and reducing manufacturing time and costs by adapting existing tooling with wire mesh and elastically-deformable components.
Implementation Method 1
the elastically-deformable component elastically deforms and presses the flexible wire mesh component against a contoured surface of the contoured object
Implementation Method 2
supplying radio frequency energy to the first forming tool, thereby causing a radio frequency electromagnetic field to be generated between the first forming tool and the wire mesh component
Implementation Method 3
the electromagnetic field excites the material, heating it from within and fusing the surfaces of the components to one another
Implementation Method 4
compressing a non-dielectric, elastically-deformable component, a wire mesh component, and a dielectric, contoured object between first and second forming tools
Data Source
AI summary
A method includes compressing a non-dielectric, elastically-deformable component, a wire mesh component, and a dielectric, contoured object between first and second forming tools. Once the components are compressed, radio frequency energy is supplied to the first forming tool, thereby causing a radio frequency electromagnetic field to be generated between the first forming tool and the wire mesh component that results in a contoured weld of the contoured object. A tooling assembly is configured to carry out the method.