Vacuum Casting vs Lost Foam Casting


Both V process casting and lost foam casting are recognized as the third generation of physical molding methods after mechanical molding and chemical molding. Both of these casting processes use dry sand filling, vibration compaction, sealing sand box with plastic film, vacuum pumping to reinforce the mold and negative pressure casting. The two processes of V process casting and lost foam casting are complementary to each other, and their respective characteristics are compared in the following table:

Lost Foam Casting vs Vacuum Casting
Item Lost Foam Casting Vacuum Casting
Suitable Castings Small and medium-sized castings with complex cavities, such as engine block, engine cover Medium and large castings with few or no cavities, such as cast iron counterweights, cast steel axle housings
Patterns and Plates Foam patterns made by moldings Template with suction box
Sand Box Bottom or five sides exhaust Four sides exhaust or with exhaust pipe
Plastic Film The top cover is sealed by plastic films All sides of both halves of sand box are sealed by plastic films
Coating Materials Water-based paint with thick coating Alcohol-based paint with thin coating
Molding Sand Coarse dry sand Fine dry sand
Vibration Molding 3 D Vibration Vertical or Horizontal Vibration
Pouring Negative Pouring Negative Pouring
Sand Process Relieve negative pressure, turn over the box to drop sand, and the sand is then reused Relieve negative pressure, then the dry sand falls into the screen, and the sand is recycled

Both lost foam casting and V process casting belong to near-net forming technology, and it is easy to realize clean production, which is in line with the general trend of casting technology development, so it has broad development prospects.





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