Composite Turbomachine Part Coating for Machining Control
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Solution Overview
Problem
Existing methods for manufacturing composite parts in the aeronautical industry struggle to precisely control the thickness of material removed during machining operations, leading to potential damage and loss of mechanical properties due to over-machining, necessitating safety margins that limit the number of operations.
Innovation Solution
A method involving the deposition of a compliance coating with a calibrated thickness and visible aspect in the mold before resin impregnation, allowing visual verification of machining compliance by an operator to ensure the removal of material does not exceed the predetermined threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple machining operations are performed on the composite part, then the surface quality and dimensional accuracy are improved, but the risk of removing excessive material and damaging the part increases
Solution Approach 1:
A compliance coating with calibrated thickness is deposited on the mold before manufacturing the composite part. This pre-applied coating serves as a visual reference that will be visible after machining, allowing operators to verify that material removal has not exceeded the maximum allowable thickness before the actual machining operations begin.
Solution Approach 2:
The compliance coating is applied with a distinct visual aspect (color or pattern) that makes it easily identifiable by operators during visual inspection. This color differentiation allows for immediate detection of the coating's presence or absence, providing a clear visual signal whether the machining depth has exceeded the permitted limit.
2Manufacturing precision
If the number of machining operations is increased to achieve desired surface quality, then manufacturing precision is improved, but the time consumption and production cost increase
Solution Approach 1:
The compliance coating automatically provides its own visual verification function. The coating itself serves as the reference standard, eliminating the need for separate measurement tools or complex inspection procedures. Operators can perform quick visual checks to determine compliance, significantly reducing inspection time compared to traditional measurement methods.
Solution Approach 2:
By using a visually distinct coating, the inspection process is simplified to a rapid visual check rather than time-consuming measurements. This allows operators to quickly verify compliance after each machining operation, maintaining high manufacturing precision while minimizing the time added to the production process.
3Measurement precision
If traditional weighing methods are used to control material removal thickness, then measurement is possible, but the precision is insufficient due to the small mass difference
Solution Approach 1:
The compliance coating provides a visual indicator system that replaces the inadequate weighing method. The distinct color or pattern of the coating allows operators to directly observe whether the coating is still present after machining, providing immediate and accurate feedback on material removal thickness without requiring sensitive measurement equipment.
Solution Approach 2:
The patent replaces the mechanical weighing system with an optical/visual inspection system. Instead of measuring tiny mass differences with sensitive scales, operators simply visually inspect the presence or absence of the colored coating, which is far more practical and equally precise for this application.
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
Enables precise control of material removal, ensuring the mechanical integrity of composite parts by visually identifying over-machining, thereby optimizing manufacturing efficiency and reducing waste.
Implementation Method 1
The resin is then injected in a liquid state by maintaining a pressure on the injected resin while the resin is polymerized by heating
Data Source
AI summary
A method for manufacturing a part made of composite material for a turbomachine, in particular of an aircraft, includes the steps of: b) arranging a preform made of fibers in a mold, c) injecting polymerizable resin into the mold, d) machining the part, and e) visually checking the part. Step b) is preceded by a step a) in which at least one compliance coating is deposited in the mold. The compliance coating has a calibrated thickness (X) and at least one visual aspect identifiable by an operator. The coating is configured to cover at least one area of the preform and to be rigidly attached thereto by the resin at the end of step c). Step e) includes verifying, by the operator, the presence of the aspect in the area.