Freight car yoke molding apparatus and method
View Patent ↗This invention teaches an improved apparatus and method to make metal alloy castings, such as freight car yokes. One embodiment of the invention comprises a core mold assembly unit, wherein the mold unit is filled with molten metal. The core mold assembly units may be further formed of the same material, such as phenolic urethane impregnated sand, which is used to accurately replicate the desired shape of a final desired product.
1. A method for casting a freight car yoke using a core mold assembly unit, the method comprising:
providing a core mold assembly unit formed from phenolic urethane treated molding sand, the core mold assembly unit including a core mold upper half and a core mold lower half mated at a common split line defining a mold, at least one riser vent in the core mold upper half, at least one filling gate in the core mold upper half, at least one mold cavity which replicates the exterior features of a cast freight car yoke, and at least one core located inside the mold cavity that replicates the interior features of a cast freight car yoke, and first and second lifting grooves positioned on opposing bottom edges of the core mold lower half; and
pouring molten metal through the filling gate and into the core mold assembly unit through the core mold assembly unit filling gate, thereby filling the core mold assembly unit cavity to cast at least one freight car yoke.
2. The casting method of claim 1 , wherein the core mold lower half includes a protrusion and the core mold upper half includes a complementary receiving cavity.
3. The casting method of claim 1 , wherein the pouring of the molten metal continues until molten metal is observed to approach or exit at least one riser vent.
4. The casting method of claim 1 , wherein four lifting grooves, two on each side of the length, are located on the bottom face of the core mold lower half.
5. The casting method of claim 1 , wherein two lifting grooves, one on each side of the width, are located on the bottom face of the core mold upper half.
6. The casting method of claim 2 , wherein the core mold lower half has three protrusions with two of the protrusions positioned towards the corners of the right side of the core mold lower half, and the third protrusion located at substantially the midpoint of the width of the left side of the core mold lower half, the core mold upper half has three complementary receiving cavities that are located in complementary positions to the protrusions, two of the receiving cavities positioned towards the corners of the right side of the core mold upper half, and the third receiving cavity is located at substantially the midpoint of the width of the left side of the core mold upper half.
7. A method for casting a freight car yoke using a core mold assembly unit, the method comprising:
providing a core mold assembly unit formed from phenolic urethane treated molding sand, the core mold assembly unit including a core mold upper half and a core mold lower half mated at a common split line defining a mold, at least one riser vent in the core mold upper half, at least one filling gate in the core mold upper half, at least one mold cavity which replicates the exterior features of a cast freight car yoke, a groove feature to facilitate ease of handling the core mold assembly unit to lift and transport the core mold assembly unit, the core mold lower half includes a protrusion and the core mold upper half includes a complementary receiving cavity; and at least one core located inside the mold cavity that replicates the interior features of a cast freight car yoke; and
pouring molten metal through the filling gate and into the core mold assembly unit through the core mold assembly unit filling gate, thereby filling the core mold assembly unit cavity to cast at least two freight car yokes at substantially the same time.
8. The casting method of claim 7 , wherein the pouring of the molten metal continues until molten metal is observed to approach or exit at least one riser vent.
9. The casting method of claim 7 , wherein four handling grooves, two on each side of the length, are located on the bottom face of the core mold lower half.
10. The casting method of claim 7 , wherein two handling grooves, one on each side of the width, are located on the bottom face of the core mold upper half.
11. The casting method of claim 7 , wherein the core mold lower half has three protrusions with two of the protrusions positioned towards the corners of the right side of the core mold lower half, and the third protrusion located at substantially the midpoint of the width of the left side of the core mold lower half, the core mold upper half has three complementary receiving cavities that are located in complementary positions to the protrusions, two of the receiving cavities positioned towards the corners of the right side of the core mold upper half, and the third receiving cavity is located at substantially the midpoint of the width of the left side of the core mold upper half.
12. A method for casting a freight car coupler connection member using a core mold assembly unit, comprising:
providing a core mold assembly unit formed from phenolic urethane treated molding sand, the core mold assembly unit including a core mold upper half and a core mold lower half mated at a common split line defining a mold, at least one riser vent in the core mold upper half, at least one filling gate in the core mold upper half, at least one mold cavity which replicates the exterior features of a cast freight car yoke, a first pair of lifting grooves located on a bottom edge of the core mold lower half and a second pair of lifting grooves located on an opposing bottom edge of the core mold lower half, and at least one core located inside the mold cavity that replicates the interior features of a cast freight car coupler connection member, the member comprising a housing framework with a main aperture formed therethrough which is sized and shaped to accommodate a freight car draft gear and a second aperture adapted to accept a tie member for connecting the member to a freight car coupler; and
pouring molten metal through the filling gate and into the core mold assembly unit through the core mold assembly unit filling gate, thereby filling the core mold assembly unit cavity to cast at least one freight car coupler connection member.
13. The casting method of claim 12 further comprising the step of:
lifting the core mold assembly unit by applying an upward force to the first and second pairs of lifting grooves.