Additive Manufacturing Elastomeric Enclosure Vacuum Compaction
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Solution Overview
Problem
Conventional Additive Manufacturing techniques for producing structural parts with complex geometries face challenges such as porosity, voids, and poor inter-laminar shear strength due to inherent defects, leading to premature failure under stress, and existing compaction methods are ineffective for complex geometries.
Innovation Solution
A method involving the simultaneous printing of parts with an elastomeric enclosure, where the ensemble is heated and subjected to vacuum to exert pressure, promoting polymer interfusion and consolidation, thereby enhancing mechanical properties and eliminating voids and interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional Additive Manufacturing techniques are used to manufacture parts with complex geometries, then the capability to produce complex shapes is achieved, but porosity, voids, and poor inter-laminar shear strength occur leading to premature failure
Solution Approach 1:
The elastomeric enclosure is printed simultaneously with the part, pre-positioned and shaped to fit the part's geometry before the compaction process begins. This preliminary preparation ensures that the enclosure is ready to apply uniform pressure during vacuum compaction, eliminating the need for post-positioning adjustments and ensuring consistent contact across the entire part surface.
Solution Approach 2:
An elastomeric enclosure is used as a flexible shell that conforms to the complex geometry of the printed part. The elastomeric material allows the enclosure to adapt to irregular shapes while maintaining uniform pressure distribution during vacuum compaction, ensuring effective consolidation across the entire part surface without creating stress concentrations.
2Manufacturing precision
If roller-based compaction is applied to deposited layers, then porosity is reduced for simple geometries, but the method becomes ineffective for complex geometries
Solution Approach 1:
The elastomeric enclosure acts as a flexible shell that can conform to any part geometry, whether simple or complex. Unlike rigid rollers that cannot adapt to irregular surfaces, the elastomeric material flexes and molds around the part's contours, ensuring uniform pressure application across the entire surface area regardless of geometric complexity.
Solution Approach 2:
The traditional mechanical roller-based compaction system is replaced with a vacuum-based system using an elastomeric enclosure. Instead of mechanical contact through rollers, the system uses atmospheric pressure differential created by vacuum application, allowing the elastomeric shell to uniformly compress the deposited layers from all sides without requiring direct mechanical contact.
3Strength
If multiple manufacturing stages are used for conventional composite parts, then structural requirements are met, but production time and cost increase
Solution Approach 1:
The invention merges the part printing process with the compaction process into a single integrated operation. The elastomeric enclosure is printed simultaneously with the part, and the vacuum compaction is applied immediately afterward without removing or repositioning components. This consolidation of steps eliminates intermediate handling, reduces production time, and maintains structural integrity.
Solution Approach 2:
The elastomeric enclosure serves multiple functions: it acts as a mold for the part, provides the sealing necessary for vacuum application, and delivers the compaction pressure itself. This self-service approach eliminates the need for separate compaction equipment and operations, streamlining the manufacturing process and improving productivity while maintaining structural requirements.
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 results in parts with improved tensile strength, compression strength, and dimensional tolerances, capable of meeting structural requirements, with reduced porosity and no interfaces, enabling the manufacture of integral aeronautical components with enhanced mechanical behavior and resistance to water ingestion and de-bonding.
Implementation Method 1
applying vacuum by the at least one opening of the elastomeric enclosure so that the elastomeric enclosure deflects thus exerting pressure to the printed part
Implementation Method 2
heating the ensemble of the printed part and elastomeric enclosure or keeping an operating printing temperature
Data Source
Figure 1~2
Figure 3a~3b
Figure 4a~4b
AI summary
Method for manufacturing a part (1) layer-upon-layer using Additive Manufacturing technology, the method comprising the following steps: - printing the part (1) together with an elastomeric enclosure (2) shaped thereto leaving a gap free of material therebetween, the elastomeric enclosure comprising at least one opening (2.1); - heating the ensemble of the printed part and elastomeric enclosure or keeping an operating printing temperature; - applying vacuum by the at least one opening of the elastomeric enclosure so that the elastomeric enclosure deflates thus exerting pressure to the printed part; and - maintaining the printed part under vacuum and heat during a predefined time.