Lost foam cast process

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Lost foam cast process

  1. 1. THE LOST FOAM CASTING PROCESSCopyright 2003 © Austin Group, LLC. All rights reserved.
  2. 2. THE LOST FOAM CASTING PROCESS Process Steps 1. Mold foam pattern sections. 2. Age pattern to allow dimensional shrinkage. 3. Assemble pattern if it is a multiple piece pattern. 4. Build cluster (multiple patterns per cluster). 5. Coat cluster. 6. Dry coating. 7. Compact cluster in flask. 8. Pour metal. 9. Extract cluster from flask.Copyright 2003 © Austin Group, LLC. All rights reserved.
  3. 3. THE LOST FOAM CASTING PROCESS 1. Mold Foam Pattern SectionsCopyright 2003 © Austin Group, LLC. All rights reserved.
  4. 4. THE LOST FOAM CASTING PROCESS Process Steps 1. Mold foam pattern sections. 2. Age pattern to allow dimensional shrinkage. 3. Assemble pattern if it is a multiple piece pattern. 4. Build cluster (multiple patterns per cluster). 5. Coat cluster. 6. Dry coating. 7. Compact cluster in flask. 8. Pour metal. 9. Extract cluster from flask.Copyright 2003 © Austin Group, LLC. All rights reserved.
  5. 5. THE LOST FOAM CASTING PROCESS 2. Age Patterns • The foam material used to create the pattern shrinks in much the same manner as a typical casting. • Patterns are “aged” by allowing them to rest at room temperature for a period of 5 to 7 days. • Patterns may also be force aged in a drying oven to allow for quicker use.Copyright 2003 © Austin Group, LLC. All rights reserved.
  6. 6. THE LOST FOAM CASTING PROCESS Process Steps 1. Mold foam pattern sections. 2. Age pattern to allow dimensional shrinkage. 3. Assemble pattern if it is a multiple piece pattern. 4. Build cluster (multiple patterns per cluster). 5. Coat cluster. 6. Dry coating. 7. Compact cluster in flask. 8. Pour metal. 9. Extract cluster from flask.Copyright 2003 © Austin Group, LLC. All rights reserved.
  7. 7. THE LOST FOAM CASTING PROCESS 3. Assemble the Pattern • Production patterns are assembled using a precision, automated gluing machine. • Glue is printed to one section of the foam and then pressed against the adjoining piece. • Multiple piece parts can be built up in this way and produce very complex geometryCopyright 2003 © Austin Group, LLC. All rights reserved.
  8. 8. THE LOST FOAM CASTING PROCESS Process Steps 1. Mold foam pattern sections. 2. Age pattern to allow dimensional shrinkage. 3. Assemble pattern if it is a multiple piece pattern. 4. Build cluster (multiple patterns per cluster). 5. Coat cluster. 6. Dry coating. 7. Compact cluster in flask. 8. Pour metal. 9. Extract cluster from flask.Copyright 2003 © Austin Group, LLC. All rights reserved.
  9. 9. THE LOST FOAM CASTING PROCESS 4. Clustering • Glue individual patterns to sprue. • Number of patterns per sprue is dependent on part size and/or configuration. • Molded sprue is manufactured similar to foam patternCopyright 2003 © Austin Group, LLC. All rights reserved.
  10. 10. THE LOST FOAM CASTING PROCESS Process Steps 1. Mold foam pattern sections. 2. Age pattern to allow dimensional shrinkage. 3. Assemble pattern if it is a multiple piece pattern. 4. Build cluster (multiple patterns per cluster). 5. Coat cluster. 6. Dry coating. 7. Compact cluster in flask. 8. Pour metal. 9. Extract cluster from flask.Copyright 2003 © Austin Group, LLC. All rights reserved.
  11. 11. THE LOST FOAM CASTING PROCESS 5. Coating • Coating parameters are verified before coating cluster. • Coating is mixed continuously to maintain properties. • Cluster may be hand dipped or by automated robot station.Copyright 2003 © Austin Group, LLC. All rights reserved.
  12. 12. THE LOST FOAM CASTING PROCESS Process Steps 1. Mold foam pattern sections. 2. Age pattern to allow dimensional shrinkage. 3. Assemble pattern if it is a multiple piece pattern. 4. Build cluster (multiple patterns per cluster). 5. Coat cluster. 6. Dry coating. 7. Compact cluster in flask. 8. Pour metal. 9. Extract cluster from flask.Copyright 2003 © Austin Group, LLC. All rights reserved.
  13. 13. THE LOST FOAM CASTING PROCESS 6. Drying • Coating is dried in an oven at 120-140°F(49- 60°C) for 3 to 5 hours.Copyright 2003 © Austin Group, LLC. All rights reserved.
  14. 14. THE LOST FOAM CASTING PROCESS Process Steps 1. Mold foam pattern sections. 2. Age pattern to allow dimensional shrinkage. 3. Assemble pattern if it is a multiple piece pattern. 4. Build cluster (multiple patterns per cluster). 5. Coat cluster. 6. Dry coating. 7. Compact cluster in flask. 8. Pour metal. 9. Extract cluster from flask.Copyright 2003 © Austin Group, LLC. All rights reserved.
  15. 15. THE LOST FOAM CASTING PROCESS 7. Compaction • Cluster is delivered to the pouring line by conveyor. • Cluster is placed into flask and held in position by a fixture • Fixture is timed to release the cluster during the compaction cycle.Copyright 2003 © Austin Group, LLC. All rights reserved.
  16. 16. THE LOST FOAM CASTING PROCESS 7. Compaction (Cont.) • Sand is rained into flask from overhead bin. • Compaction tables can be either vertical or horizontal in orientation and vibrate the flask during filling. • Sand is compacted from approximately 90lb/ft³ to 100 lb/ft³ by the compaction table.Copyright 2003 © Austin Group, LLC. All rights reserved.
  17. 17. THE LOST FOAM CASTING PROCESS Process Steps 1. Mold foam pattern sections. 2. Age pattern to allow dimensional shrinkage. 3. Assemble pattern if it is a multiple piece pattern. 4. Build cluster (multiple patterns per cluster). 5. Coat cluster. 6. Dry coating. 7. Compact cluster in flask. 8. Pour metal. 9. Extract cluster from flask.Copyright 2003 © Austin Group, LLC. All rights reserved.
  18. 18. THE LOST FOAM CASTING PROCESS 8. Metal Pour • Metal is poured to displace the polystyrene pattern. • Metal may be poured by hand or with an automatic ladle.Copyright 2003 © Austin Group, LLC. All rights reserved.
  19. 19. THE LOST FOAM CASTING PROCESS Process Steps 1. Mold foam pattern sections. 2. Age pattern to allow dimensional shrinkage. 3. Assemble pattern if it is a multiple piece pattern. 4. Build cluster (multiple patterns per cluster). 5. Coat cluster. 6. Dry coating. 7. Compact cluster in flask. 8. Pour metal. 9. Extract cluster from flask.Copyright 2003 © Austin Group, LLC. All rights reserved.
  20. 20. THE LOST FOAM CASTING PROCESS 9. Extraction • Casting is allowed to cool in sand for a predetermined period. • Flask is then dumped on to a shakeout conveyor. • Loose sand around the casting cluster helps protect the parts from damage.Copyright 2003 © Austin Group, LLC. All rights reserved.
  21. 21. THE LOST FOAM CASTING PROCESS 9. Extraction (Cont.) • Castings proceed through shakeout to remove loose sand and coatingCopyright 2003 © Austin Group, LLC. All rights reserved.
  22. 22. THE LOST FOAM CASTING PROCESS Final CastingCopyright 2003 © Austin Group, LLC. All rights reserved.

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