Process Coupons for Flexure Manufacturing Variation Detection
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Solution Overview
Problem
Conventional manufacturing processes for flexures often result in variations that lead to performance issues, necessitating improved methods to ensure dimensional and performance requirements are met.
Innovation Solution
A system and method using process coupons are introduced, where sensors analyze physical characteristics of coupons formed during manufacturing to detect abnormalities, allowing for adjustments to the manufacturing process to prevent faulty flexures from being produced.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional additive deposition and subtractive processes are used to manufacture flexures, then manufacturing capability is achieved, but variations occur making the flexure unable to perform as required
Solution Approach 1:
The patent applies preliminary action by incorporating test coupons into the manufacturing process that are processed simultaneously with the flexures. These coupons undergo the same additive deposition and subtractive processes, allowing potential process variations to be detected before the actual flexures are completed. This advance detection enables corrective actions to be taken while the manufacturing process is still ongoing, preventing defective flexures from being produced.
Solution Approach 2:
The patent implements feedback by continuously monitoring the physical characteristics of test coupons during manufacturing and using this information to adjust process parameters. Sensors measure properties such as thickness, conductivity, and dimensional features of the coupons, and this real-time data feeds back to control systems that can modify deposition rates, etching parameters, or other process variables to maintain flexure quality within specifications.
2Device complexity
If multiple manufacturing processing steps are completed to form flexure layers, then structural complexity is achieved, but variations accumulate making the flexure unable to meet performance requirements
Solution Approach 1:
The patent applies preliminary action by placing test coupons at strategic points throughout the multi-step manufacturing process. Each coupon undergoes a subset of the processing steps, allowing variations to be detected at each stage before they accumulate in the final flexure product. This staged detection approach enables early intervention to prevent variation accumulation across multiple processing steps.
Solution Approach 2:
The patent implements feedback by measuring physical characteristics of coupons after each major processing step and using this information to adjust subsequent process parameters. This step-by-step feedback control prevents variation accumulation by correcting deviations at each stage rather than allowing them to compound through multiple processing steps.
3Measurement precision
If test coupons are used to monitor manufacturing variations, then detection capability is improved, but process time and complexity increase
Solution Approach 1:
The patent applies merging by integrating test coupons into the same manufacturing process flow as the actual flexures. The coupons are processed simultaneously with the flexures through the same additive deposition and subtractive steps, eliminating the need for separate test runs. This consolidation allows manufacturing variations to be detected without adding significant time to the overall production cycle.
Solution Approach 2:
The patent applies self-service by designing the test coupons to automatically indicate process variations through their physical characteristics. The coupons' measured properties directly reflect process conditions, providing self-diagnostic information about manufacturing variations without requiring complex external testing equipment or additional measurement steps beyond standard process monitoring.
Data Source
AI summary
A system and methods for manufacturing devices such as flexures using process coupons are described are described. The method including performing a test on at least one feature of a coupon, the coupon is included on an assembly sheet used in manufacturing flexures. The at least one feature is produced by a manufacturing processing step that is used to produce a portion of a flexure. And, the physical characteristics of the feature include at least one physical characteristic that is different than physical characteristics of the portion. The method also including determining the manufacturing processing step will produce an abnormal portion of a flexure based on the performed test. Further, the method includes adjusting the manufacturing processing step and manufacturing a portion of a flexure using the adjusted manufacturing processing step.