Vibration welding of expanded bead polystyrene

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

B - Operations, Transporting

22

C

22/161, 18/637,

B22C 7/02 (2006.01) B29C 65/06 (2006.01)

Patent

CA 1153856

ABSTRACT OF THE DISCLOSURE A method of making a composite consumable pattern for use in the cavityless type of metal casting is dis- closed. 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 .03-.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.

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