Joining sand cores for making castings

Details Joining sand cores for making castings Joining sand cores for making castings

B - Operations, Transporting

22

C

B22C 9/10 (2006.01) B22C 9/02 (2006.01)

Patent

CA 2138578

A method of making a sand core assembly, comprising: providing two or more sand cores parts with accurately mating surfaces and an injection port in at least one of the sand core parts that intersects with a desired portion of the mating surfaces, the core parts cooperating to define at least one molding surface; mechanically dry mating the core parts together at the mating surfaces to eliminate any space therebetween except for microfissures at the mating surfaces; and injecting a limited quantity of quick-setting (i.e., organic polyamide) adhesive into the port with a controlled pressure and viscosity effective to migrate the adhesive throughout the port but no further than the microfissures spaced from the molding surface. After the adhesive has set, the mated core assembly parts may be assembled into the mold, iron inserts inductively heated to about 600°F and molten metal poured into cavity, with only the adhesive to hold the suspended core parts in place.

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