CF34-10A Fan Frame Etching immersion Fixture
Bibliographic record
Abstract
Magellan Aerospace Winnipeg has recently obtained a contract which includes completing an in-house etching immersion process for the CF34-10A jet engine fan frame. A fixture is required to secure, lift and rotate the fan frame to complete this process. The fan frame is the main structural component in the jet engine and provides support to the engine booster assembly through bearings and structurally supports the rotor. The frame also provides ducting for primary and secondary air flows through the engine. The etching immersion process removes an alpha case surface layer that is formed on the titanium from oxidation during the casting process. This layer creates a brittle surface and results in micro-cracks that contribute to a reduction in fatigue properties in the titanium. A nitric-hydrofluoric acid bath is used to remove the alpha case layer. While Magellan Aerospace has the acid bath, they require a fixture that can be used to secure, lift, submerge and rotate the fan frame in the acid. Initially, a set of design criteria and metrics were created by meeting with the client resulting in defining the main functions of the design and its process requirements. Concepts were generated and filtered through a concept screening and weighted decision matrix selection process. The top concept was then analyzed both analytically and numerically to ensure safety standards and criteria were met. Lastly, engineering drawings, a bill of materials, a standard operating procedure, an assembly procedure and a failure modes and effects analysis were completed. A design proposal that meets all functional requirements was achieved during the four-month project. Primary needs met include: • Total cost of $17,913.33 achieving under an allocated budget of $28,000. • Weight of 312 lbs achieving under an 800 lbs weight limit excluding the fan frame. • Minimal maintenance for a 4-year design life while etching one fan frame per week. • Consistent rotation at 1 RPM for 20-minutes using current pneumatic shop resources. • Meets Manitoba Safe Work and ASME safety standards and regulations. • A modular design which can simply attach and detach from the fan frames allowing them to be stored on a future portable stand.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.023 | 0.005 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".