OBJECTIFS :
Éliminer les contaminants secs, tels que les agents de démoulage défectueux et cuits, des moules et des composants du système de livraison sans perturber l'intégrité dimensionnelle, les tolérances ou l'intégrité de la surface. 
ÉQUIPEMENT - "C.M." MACHINES DE NETTOYAGE PAR SABLAGE ET CARACTÉRISTIQUES :
"Equipement de nettoyage sans air, automatique, de type roue centrifuge avec table de travail rotative.
La plupart des besoins de production peuvent être satisfaits par des unités de grenaillage de table dans la gamme "C.M." - T5 - T10 - T14. La plupart des machines actuellement en service dans l'industrie sont standard, mais des modifications/options sont disponibles pour les rendre plus pratiques, plus efficaces et pour optimiser le nettoyage. Quelques exemples importants sont énumérés ci-dessous :
DES TABLES SATELLITES EXTRACTIBLES ET INDEXABLES.
Les tables satellites permettent de réduire les temps de nettoyage et donc d'augmenter la productivité. Elles garantissent également une couverture optimale des supports sur toutes les surfaces de travail. Les tables satellites s'indexent généralement de 45° à 60° à chaque tour complet de la table principale. Ainsi, les moules situés sur un satellite seront exposés au jet de sable sous plusieurs angles différents pendant le cycle de nettoyage. Le média peut pénétrer beaucoup plus efficacement, ce qui améliore considérablement le nettoyage des surfaces d'appui et réduit les temps de nettoyage.
PUISSANCE ACCRUE DE LA TURBINE.
Une plus grande puissance signifie un débit de média plus élevé. Le temps de nettoyage est inversement proportionnel au nombre d'impacts du média et, par conséquent, l'augmentation du débit du média réduit le temps de nettoyage et augmente donc la productivité.
" C.M." MOLD CLEANING PROCESS DESCRIPTION:
The cleaning machine, filled with special very fine steel media, is placed in operation by energizing the electrical control station on the machine. The load doors are opened so that molds can be positioned on the work table or on satellite tables.
A load of workpieces to be cleaned are positioned on the work table or satellite tables. The entire table area can be covered. Note that the molds must be free of greasy or oily substances. The machine can remove any dry contaminants such as scale, oxidation, or dirt. But grease and oil should be avoided.
The load doors are closed. The desired cleaning time is set on the cleaning cycle timer on the control station panel. A cycle button is actuated to begin the cleaning operation.
Following termination of the cleaning cycle an acoustical signal will sound to alert the operator that the load doors can be opened.
The molds have been cleaned on all sides except that which rested on the work table or satellite table. Therefore usually at this point the molds are turned over and subjected to a second cleaning operation so that cleaning is complete.
Upon termination of the second cleaning cycle the acoustic signal will again sound and the load doors can be opened.
The blast cleaned molds are removed from the machine. A new cleaning cycle can be initiated once another load of molds is placed on the work table or satellite tables and the load doors are shut. Ordinarily it is not necessary to change the cleaning time set on the timer. The cleaning time for most loads is generally fairly constant.
TYPICAL "C.M." MOLD CLEANING PROCESS CYCLE TIMES:
|
|
min |
sec |
|
Loading of molds onto the work table or satellite tables, closing of load doors, and actuation of the cleaning cycle "start" pushbutton. |
1 |
00 |
|
Cleaning. |
2 |
30 |
|
Blastwheel arrest, opening of load doors, turning the molds over, closing of load doors, and actuation of the cleaning cycle "start" pushbutton. |
1 |
30 |
|
Cleaning. |
2 |
30 |
|
Blastwheel arrest, opening of load doors, removal of the blast cleaned molds. |
2 |
00 |
|
TOTAL FULL LOAD CYCLE TIME |
9 |
30 |
" C.M." MOLD CLEANING PROCESS ADVANTAGES:
- High productivity. Full loads of molds can be cleaned in brief cycles.
- Low energy requirements.
- No compressed air required.
- Little manual labor. The operator must only load, turn over, and unload the molds. Cleaning occurs automatically.
- No appreciable machine wear.
- Repeatability : the same thorough, uniform cleaning every cycle, every mold.
- No mold damage. Edges are not rounded, tolerances are respected, and the resulting finish is smoother and better than that generated by glass beads compressed air operated equipment.
- Low operating costs.
- Up to 60% longer mold life with respect to molds cleaned with glass beads in compressed air blasting equipment
- Safe and efficient.
