Vergleich zwischen Niederdruck- und Schwerkraft-Sandguss für einen dünnwandigen Aluminiumrotor aus der Legierung A356
Bibliographic record
Abstract
Ein Verdichter-Rotor aus Aluminium A356 wurde mit zwei unterschiedlichen Formfullverfahren im Sandguss hergestellt: Niederdruckguss und Schwerkraftguss. Das Gussteil hat eine begrenzte Grose (170 mm Durchmesser, 1,2 kg) und eine sehr komplizierte Form, sodass es sich besonders gut fur den 3D-Formendruck eignet. Die Herstellung dieses Teils unter Verwendung des herkommlichen Modell-Kernkasten-Prozesses umfasste die Montage von 12 Kernen innerhalb der Form; hierbei waren sehr enge Mastoleranzen erforderlich, da die Rotorblatter nur 2 mm dick sind. Folglich wurden die Niederdruck-Gussformen auf dem ExOne M-Flex-Drucker im Centre de Metallurgie du Quebec (CMQ) hergestellt, wahrend die Schwerkraft-Gussformen auf dem Voxeljet VX1000-Drucker bei Lycee Hector Guimard produziert wurden. Eine Anzahl von Rotoren wurde gemas jedem Verfahren fur unterschiedliche Giestemperaturen und Fullzeiten (nur fur Niederdruck) gegossen, um die Formfullungsfahigkeit des Niederdruckprozesses mit dem Schwerkraftverfahren zu vergleichen. Ein Kriterium zur Vorhersage von Auslauffehlern ergab sich aus der numerischen Stromungssimulation (Computational Fluid Dynamics - CFD) -Modellierung der Formhohlraumfullung; dieses Kriterium gilt sowohl fur Niederdruck- als auch fur Schwerkraftguss. // Comparing Low-Pressure and Gravity Sand Casting of a Thin-Bladed Aluminum A356 Rotor // An aluminum A356 compressor rotor was sand cast with two different cavity-filling methods: low-pressure and gravity. The casting is limited in size (170 mm diameter, 1.2 kg) and very intricate in shape thus lending itself particularly well to 3D mold printing. Producing this part using the traditional pattern-core box route involved mounting 12 cores inside the mold while very stringent dimensional tolerances were required, as the rotor blades are only 2 mm thick. Consequently, the low-pressure molds were produced on the ExOne M-Flex printer at the Centre de Metallurgie du Quebec (CMQ) while the gravity poured molds were produced on the Voxeljet VX1000 printer at Lycee Hector Guimard. A number of rotors were cast according to each technique for different pouring temperature and filling times (for low pressure only) so as to compare the filling capability of the low-pressure process versus gravity. A criterion to predict misruns was obtained from computational fluid dynamics (CFD) modeling of the mold cavity filling, criterion which applies both in low pressure and gravity.
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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 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 0.001 |
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".