Thermoplastic Part Manufacturing System with Localized Conduction Heating
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Solution Overview
Problem
Current methods for manufacturing large thermoplastic parts for aircraft structures are energy-intensive and time-consuming, and existing systems face challenges in achieving high mechanical strength and efficient production, particularly with complex geometries and large dimensions.
Innovation Solution
A system utilizing a pair of molding members with integrated heating bodies and thermal insulation, along with a flexible sealed envelope and suction member, allows for localized conduction heating and controlled pressure to produce thermoplastic parts with high mechanical strength, reducing energy consumption and production time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If autoclave is used to manufacture large thermoplastic parts, then parts with large dimensions can be manufactured, but energy consumption is extremely high and production time is very long
Solution Approach 1:
The patent applies localized heating through heating bodies positioned directly against the blank part between molding members, rather than heating the entire autoclave chamber. This concentrates thermal energy only where needed, dramatically reducing overall energy consumption while still enabling manufacturing of large parts exceeding 5 meters in dimension.
Solution Approach 2:
The heating system is divided into multiple discrete heating bodies that can be independently controlled and positioned. Each heating body contacts the blank part locally, allowing segmented heating zones that reduce total energy requirements compared to uniform chamber heating, while maintaining the capability to manufacture large-scale parts.
2Length of stationary object
If autoclave is used to manufacture large thermoplastic parts, then parts with large dimensions can be manufactured, but production time is extremely long
Solution Approach 1:
Localized heating bodies directly contact the blank part to concentrate thermal energy where needed, enabling faster heating rates compared to ambient chamber heating. This reduces the polymerization time from over eight hours to a more efficient process while maintaining capability to manufacture large parts.
Solution Approach 2:
The heating bodies are pre-positioned between the molding members and the blank part before the manufacturing cycle begins. This preliminary positioning ensures immediate heat transfer upon activation, reducing warm-up time and accelerating the overall production cycle for large parts.
3Productivity
If press is used to manufacture thermoplastic parts, then manufacturing cycle is shorter, but perfect alignment of molds is required and compression force must be equivalent over entire length
Solution Approach 1:
Multiple independently controllable heating bodies are positioned at different locations between the molding members and blank part. Each heating body can be controlled independently, allowing local adjustment of thermal and compressive conditions without requiring perfect alignment or uniform compression across the entire part length, simplifying the manufacturing process.
Solution Approach 2:
The heating bodies are designed to be movable and adjustable, allowing dynamic positioning and independent control of each heating zone. This flexibility enables adaptation to varying part geometries and thicknesses without requiring rigid mold alignment, reducing device complexity while maintaining short manufacturing cycles.
4Use of energy by stationary object
If inductive heating circuit is used to heat ferromagnetic material, then energy consumption is reduced, but expensive ferromagnetic alloy is required and temperature control is complex
Solution Approach 1:
The patent replaces inductive heating with direct thermal conduction through heating bodies that physically contact the blank part. This substitution eliminates the need for ferromagnetic materials and complex electromagnetic field control, achieving efficient energy transfer through simple thermal conduction while reducing device and material costs.
Solution Approach 2:
The heating bodies appear to be simple, replaceable components rather than complex inductive heating systems. This approach uses inexpensive heating elements that can be easily replaced or repositioned, avoiding the need for expensive ferromagnetic alloys and complex temperature control systems while maintaining energy efficiency.
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 enables the efficient manufacture of large thermoplastic parts with high mechanical strength, reducing energy and time requirements while eliminating the need for expensive ferromagnetic materials, and allowing for precise and homogeneous heating and consolidation.
Implementation Method 1
at least one first heating body mounted to the first molding member along the vertical axis and configured to heat the first molding member through conduction to a heating temperature above 200° C., so as to heat the blank part through conduction to a temperature above its melting temperature
Implementation Method 2
at least one first thermal insulation member positioned on the first heating body along the vertical axis and at least one second thermal insulation member positioned under the second molding member along the vertical axis, configured to delimit together a closed cavity
Implementation Method 3
at least one suction member configured to lower the internal pressure in the inner volume of the envelope relative to the external pressure, so as to compress the blank part between the molding members during its heating
Data Source
AI summary
A system for manufacturing a thermoplastic part from a blank part having a first moulding member and a second moulding member which are configured to cooperate together. A first heating body configured to heat the first moulding member and conductively heat the blank part. Two thermal insulation members are configured to cooperatively define a closed cavity in which at least the moulding members and the first heating body are arranged. A casing defining an internal volume in which at least the moulding members, the first heating body and the thermal insulation members are arranged, and a suction member is configured to lower the internal pressure in the internal volume to compress the preform part between the moulding members.