Vibration welding of expanded bead polystyrene

Details Vibration welding of expanded bead polystyrene Vibration welding of expanded bead polystyrene

1978-11-02

1980-02-26

Baldwin, Robert D.

Metal founding

Process

Shaping a forming surface

164 45, 156 735, 164246, B22C 904, B22C 702

Patent

active

041900936

ABSTRACT:
A method of making a composite consumable pattern for use in the cavityless type of metal casting is disclosed. At least two mateable pattern parts are formed entirely of a low density expanded closed-cell polymeric material which is ignitable upon contact with molten metal. The parts are brought together with predetermined mateable surfaces in contact under a pressure of 5-10 psi; one of the parts is vibrated with a frequency of 120-240 cycles per second and an amplitude of 0.03-0.10", to promote a controlled friction at the interface. A predetermined depth of the parts is melted and merged to create a water-tight bond between the mating surfaces upon relief of the vibration.

REFERENCES:
patent: 3002871 (1961-10-01), Tramm et al.
patent: 3275179 (1960-09-01), Lux et al.
patent: 4064927 (1977-12-01), Ostrowski

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