Patent ID: 8448691

Claim:
A method for casting a subway car undercarriage bearing housing using a core mold assembly unit, the method comprising: providing a core mold assembly unit made from phenolic urethane treated molding sand, the core mold assembly unit including a core mold upper half and a core mold lower half, at least one riser vent in the core mold upper half to allow venting of said core mold assembly unit, the core mold upper and lower halves mated at a common split line defining a mold, at least one filling gate in the core mold upper half, at least one mold cavity which replicates the exterior features of a cast subway car undercarriage bearing housing, and at least one core located inside the mold cavity that replicates the interior features of a cast subway car undercarriage bearing housing, the core mold lower half includes a ridge located along the entire outer edge of an upper face thereof and the core mold upper half has a complementary receiving edge located on the entire outer edge of a lower face thereof; and pouring molten metal through the filling gate and into the core assembly unit through the core mold assembly unit filling gate, thereby filling the core mold assembly unit cavity to cast at least two subway car undercarriage bearing housings are produced during the same pouring step.