ࡱ> *,)g9 W!bjbj )@>l&&&&&&&:8 4L:Q (HHHHHH fQ&HHHHH&&HH H&H&HHVL&&LH `UF#L: LLl!0QL__L::&&&&Sujet 91: Les pains en Tranche Prsentation gnrale 1 pain donne 13 plaquettes dpaisseur 13 mm Cadence 1 pain toutes les 15s Disponibilit: temps moyen darrt de production < 3 min par jour. 7 Zones: Zone 1 Compactage des blocs compose de 3 presses. Chaque bloc ralise un bloc de 300 * 300 hauteur 175 en 90s Zone 2 Sciage en 2 pains de 300 * 150 Zone 3 Sciage des pains. 3 pains simultanment. Zone 4 Ensachage des plaquettes. Zone 5 Reconstitution des pains et cerclage. Zone 6 et 7 Miser en carton Coordination des tches sur la ZONE 3 Tche 1: Slection et dclassement des pains. Tche 2: Transfert des 3 pains. Tche 3: Avance pas pas des pains. Tche 4: Sciage et bridage. Tche 5: Evacuation des plaquettes. Tche 6: Retour des 3 racleurs. Nmax: Reprsente le nbr de plaquette maximum avec le tps appartis. 1.1 Le temps de cycle prvisionnel est de 45 s. Justifier cette valeur. 1.2 Dterminer Nmax ralisables avec les dures prvisionnelles. (Note: La tche T1 est compatible avec la dure du cycle) 1.3 Modification du grafcet de coordination pour un objectif de Nmax=16 avec un temps de cycle constant. Solution retenue, dcomposition de la tche 5 en 3 sous tche: ST 51(0,25s): Dgagement de la plaquette scie dela zone de sciage (Descente par gravit en dessous du niveau du pain en cours de sciage). ST52(1,5s): Transfert plaquette vers le tapis C8 (par gravit au moyen dune goulotte). ST53 (1,5s): Avance des 3 plaquettes par le tapis vers lensacheuse (Dgagement zone darrive plaquettes) Note: Un risque de collision entre sries de plaquettes conscutives existe en fin de sciage. Ce risque doit tre limin. 1.4 Lobjectif Nmax=16 est il respect? Si non, solutions envisager? Travail sur la tche: Dclassement en 3 pains en position A B C. Dcomposition en 6 sous tche. Un grafcet partiel est propos. Note: Le mode de production plaquette ncessite la mise en position darrt de la bute A. Cette mise en position est obtenue dans une marche de prparation hors tude. Les Hypothses:Vitesse de dplacement du transfert , tapis C2 et C3: 0,2 m/s, Slection de 2 nouveaux pains nest autorise que si le transfert de dclassement est en position arrire. Bute B est descendue ds que le pain prcdent a atteint la position A. De mme pour C. Dure sous tche 11 16, dure de la squence A? Dcrire la squence homologue. Prciser les rceptivit associe la transition 10 vers 11B. Dure de la squence? Dure maxi de la tche 1? Comparer avec la dure admissible? Capacit C24 Tranche de pain La mesure du dplacement est obtenue par un capteur de type rgle incrmentale. (Course 200mm) Le signal de sortie es acquis au moyen dune carte de comptage rapide. 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