Material: Gray Iron GG25, EN-GJL-250, HT250 Process: Lost Foam Cast + CNC Machining Weight: 6 kg Application: Gearbox Housing of Truck Parts
OEM Custom Casting Parts by Lost Foam Casting Process from China Casting Foundry Company.
During lost foam casting process, the sand is not bonded by adhensive materials, but a foam pattern is used to form the shape of the desired metal parts. The foam pattern is "invested" into the sand at the Fill & Compact process station allowing the sand into all voids and supporting the foam patterns external form.
Before making the foam patterns, the lost foam casting foundry should finish the process of pre-foam. The original beads are heated to above the softening point to quickly vaporize and expand the foaming agent, forcing the beads to reach the foaming density required by the foam template, and then quickly cool to stop the foaming of the foam beads and maintain the pre-expanded volume.
Lost Foam Casting vs Vacuum Casting
Lost Foam Casting
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
Bottom or five sides exhaust
Four sides exhaust or with exhaust pipe
The top cover is sealed by plastic films
All sides of both halves of sand box are sealed by plastic films
Water-based paint with thick coating
Alcohol-based paint with thin coating
Coarse dry sand
Fine dry sand
3 D Vibration
Vertical or Horizontal Vibration
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