Blisk Feature Classification With Localized Tolerance Ranges
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Solution Overview
Problem
The existing methods for classifying component features in turbomachine components, such as blisks, often result in a high rejection rate due to strict tolerance ranges, where deviations outside the uniform tolerance range lead to components being classified as unusable, despite potentially being tolerable in specific areas, causing unnecessary extended testing or discard.
Innovation Solution
A method that classifies component features based on both a primary and secondary feature specification, where the secondary tolerance range is expanded in specific scopes to accommodate larger, reproducible deviations, allowing components to be deemed tolerable and usable even if they do not meet the primary specification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a uniform tolerance range is applied to the entire component, then the component quality is consistently controlled, but the rejection rate increases due to reproducible manufacturing deviations in specific areas
Solution Approach 1:
The patent applies different tolerance ranges to different areas of the component. A first tolerance range is applied to a first area, while a second, expanded tolerance range is applied to a second area where reproducible manufacturing deviations occur. This local differentiation allows the component to be accepted despite deviations in the second area, reducing rejection rate while maintaining quality in critical areas.
2Reliability
If a strict uniform tolerance range is enforced, then high quality standards are maintained, but components with tolerable deviations are unnecessarily rejected or subjected to extended testing
Solution Approach 1:
The patent differentiates tolerance requirements by location, applying strict tolerance only where necessary and expanded tolerance where reproducible deviations occur. This eliminates unnecessary extended testing for components with acceptable deviations in non-critical areas, reducing time loss while maintaining quality standards where required.
3Productivity
If the tolerance range is expanded to accommodate manufacturing variations, then the rejection rate decreases, but the manufacturing precision requirement is compromised
Solution Approach 1:
The patent expands the tolerance range only in specific areas where reproducible manufacturing deviations occur, while maintaining strict tolerance in other areas. This localized approach reduces rejection rate without compromising manufacturing precision requirements in critical areas, as the expanded tolerance is applied selectively rather than uniformly.
Data Source
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AI summary
The invention relates to a method for classifying a component feature of a component, in particular a blisk or part of a blisk for a turbomachine, which is manufactured using a manufacturing process, wherein the component feature is classified depending on a first feature specification (11) and on a second feature specification (12) for a measured quantity of the component feature, wherein a second tolerance range of the second feature specification (12) is extended compared to a first tolerance range of the first feature specification (12), wherein a second scope of application of the component for the second feature specification (12) is smaller than a first scope of application of the component for the first feature specification (11), wherein the manufacturing process in the second scope of application reproducibly and/or systematically causes a larger mean deviation of the measured quantity than in the first scope of application.