Thermoplastic Composite Consolidation Using Magnetic Compression
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Solution Overview
Problem
Existing methods for manufacturing fiber-reinforced thermoplastic structural components with curved or double-bent shapes are inefficient and require extensive tooling, leading to suboptimal process efficiency and mechanical strength.
Innovation Solution
A method involving a layered structure of non-consolidated thermoplastic layers, heated to a temperature above the matrix material's melting point, with compression pressure applied using magnetic fields generated by magnets, and optionally evacuated to enhance consolidation, allowing for rapid heating and uniform pressure distribution without traditional pressing tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional pressing tools and extensive tooling are used for manufacturing fiber-reinforced thermoplastic structural components, then the structural component can be formed, but the process efficiency is reduced and manufacturing complexity increases
Solution Approach 1:
The patent replaces traditional mechanical pressing tools with a magnetic field generation system. Electromagnets mounted on the contour surface create magnetic fields that exert forces on ferromagnetic particles embedded in the matrix material, eliminating the need for complex mechanical pressing apparatus while achieving the same consolidation effect
Solution Approach 2:
The contour surface itself serves dual functions: it provides the geometric shape for the structural component and simultaneously generates the magnetic fields for consolidation. The ferromagnetic particles within the matrix material act as the active element that responds to the magnetic field, making the system self-sufficient without requiring separate pressing tools
2Manufacturing precision
If traditional compression methods are used, then the layered structure can be consolidated, but the pressure distribution is non-uniform and air content remains high
Solution Approach 1:
The magnetic field strength varies locally across the contour surface, creating different field intensities in different regions. This local variation in magnetic field strength produces corresponding variations in magnetic force that precisely match the local consolidation requirements, ensuring uniform pressure distribution and complete air evacuation throughout the layered structure
Solution Approach 2:
The patent changes the physical state of the matrix material by heating it above its melting point, transforming it from a solid to a viscous state. This parameter change allows the material to flow and consolidate more effectively under magnetic field forces, enabling complete air evacuation and uniform density distribution
3Strength
If the layered structure is heated to melting point and consolidated with compression pressure, then the thermoplastic material solidifies and bonds layers, but traditional methods require extensive tooling and have suboptimal mechanical strength
Solution Approach 1:
The patent substitutes mechanical pressing forces with magnetic field forces. Electromagnets generate magnetic fields that exert attractive forces on ferromagnetic particles in the matrix material, pressing layers together during solidification without requiring complex mechanical pressing tools, thereby improving mechanical strength while reducing tooling complexity
Solution Approach 2:
The patent incorporates ferromagnetic particles into the thermoplastic matrix material, creating a composite material system. This addition enables the material to respond to magnetic fields, allowing magnetic forces to be used for consolidation and bonding during the solidification process, thereby improving inter-layer bonding strength
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 accelerates the manufacturing process, improves mechanical strength by reducing air content, and achieves uniform pressure distribution, resulting in high-quality structural components with reduced tooling requirements.
Implementation Method 1
a magnetic field directed transversely, preferably perpendicularly, to the contour surface, which magnetic field is coupled into a magnetizable material associated with the abutment member and/or into a magnetizable material associated with the contour surface
Implementation Method 2
the magnetic field draws the abutment member and the contour surface together relative to each other
Implementation Method 3
the abutment member and/or the contour surface include an inductively heatable material and the heating is carried out inductively
Implementation Method 4
heating is carried out inductively, i.e. by generating alternating magnetic fields by means of an alternating electrical voltage which induce eddy currents in the inductively heatable material
Implementation Method 5
The layered structure is heated in a cavity formed between a contour surface and an abutment member to a first temperature greater than a melting point of the thermoplastic matrix material
Implementation Method 6
cooling of the layer structure in the cavity to a solidification temperature, which is, for example, lower than the melting point of the thermoplastic matrix material, is performed. Thereby the thermoplastic material of the layer structure solidifies
Implementation Method 7
the cavity is evacuated, in particular by means of a vacuum device
Data Source
AI summary
Methods of manufacturing a structural component each include providing a preformed layered structure including a plurality of layers each having reinforcing fibers embedded in a thermoplastic matrix material, heating the layered structure in a cavity formed between a contour surface and an abutment member to a first temperature, which is greater than a melting point of the thermoplastic matrix material, and cooling the layer structure in the cavity to a solidification temperature which is, e.g., less than the melting point of the thermoplastic matrix material, while applying a compression pressure. According to a method, the compression pressure is generated by using a magnet device to generate a magnetic field directed transversely to the contour surface, which pulls or compresses the abutment member and the contour surface relative to each other. According to a further method, inductive heating of the cavity occurs.