On the Development of Protective Devices for Bending Press
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Notice bibliographique
Résumé
Brake presses are machines which are widely found in the manufacturing industry. They enable metal sheets and plates to be bent in multiple ways so as to shape a wide variety of parts. The very principle by which these machines function creates a pinch and crushing zone for operators notably as far as their hands and fingers are concerned. This paper recounts research projects conducted in the last 30 years at École de Technologie Supérieure (ETS). Historically, the first publication described the state of the situation in the 1990s in terms of safety of brake presses found in the transport equipment and machine manufacturing industry in Quebec. It was found that a small percentage of the brake presses surveyed were properly equipped with adequate safety devices. The research report showed a number of problematic situations arising in industry such as complex shapes (for example, cones, tubes, boxes with multiples bends) which render use of protective devices available at the time difficult and even unfeasible. To address the issue of the low prevalence of protective devices on brake presses, a study on the feasibility and applicability of light curtains on these machines was conducted. It was shown that the mode of operation of the light curtain as well as the geometry of the work-pieces were crucial factors which determined the feasibility of light curtains as effective protective devices on brake presses. Difficulties in using these devices in certain cases were uncovered. To alleviate these difficulties, a further research project sought to develop more flexible protective device on brake press. The concept was based on computer vision. A bracelet was to be worn by the operator. A system of cameras captured images of the operator’s hands and a computer algorithm calculated in real time the position of the hand with respect to a defined hazard zone. From the risk assessment and reduction viewpoint, a risk evaluation methodology based on fuzzy numbers was developed to address the issue of lack of reliability both machine and human-related in assessing probability of occurrence of hazardous events. A risk reduction methodology was also proposed helping to identify action priorities in an analytical way.
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Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découle