A cast metal railroad car wheel includes a hub section, a tread section, and an uninterrupted annular web extending between and supporting the tread section on the hub section. The web includes a disk-shaped surface that is continuously concave and that does not include a reversely curved portion. A V-process casting process casts railroad wheels using a vacuum-process casting mold with opposing halves each partially filled with unbonded sand and sand-retaining-plastic film and a vacuum application port and that, when positioned together with the unbonded sand held to shape by vacuum and the film, define a cavity shaped to form a railroad car wheel. The V-process includes feeding molten metal into the cavity, cooling the molten metal, and releasing a vacuum to cause the sand to fall away from the railroad car wheel.

The present invention provides an integrally cast excavator bucket and a manufacturing method thereof. The integrally cast excavator bucket comprises a lifting lug, a top plate, two side plates and a bottom plate connected with the two side plates. A method for manufacturing the integrally cast excavator bucket by adopting the cast steel comprises the following steps: putting cast steel components into a melting furnace, and carrying out modification treatment before furnace after melting is finished; manufacturing models and a template, coating, heating, vacuumizing, placing sandboxes, adding sand, molding, carrying out mold closing, casting, quenching, tempering and cooling to room temperature to finish casting of the excavator bucket. The integrally cast excavator bucket is formed by once casting from a low-alloy steel material by adopting a vacuum sealing technology, and is high in product strength, resistant to wear and corrosion, high in impact resistance and long in service life.

The present invention provides an integrally cast excavator bucket and a manufacturing method thereof. The integrally cast excavator bucket comprises a lifting lug, a top plate, two side plates and a bottom plate connected with the two side plates. A method for manufacturing the integrally cast excavator bucket by adopting the cast steel comprises the following steps: putting cast steel components into a melting furnace, and carrying out modification treatment before furnace after melting is finished; manufacturing models and a template, coating, heating, vacuumizing, placing sandboxes, adding sand, molding, carrying out mold closing, casting, quenching, tempering and cooling to room temperature to finish casting of the excavator bucket. The integrally cast excavator bucket is formed by once casting from a low-alloy steel material by adopting a vacuum sealing technology, and is high in product strength, resistant to wear and corrosion, high in impact resistance and long in service life.

A method for manufacturing graphene aluminum casting where special sand boxes are used together with vacuum evacuation to harden dry sand between two pieces of EVA film, thereby producing an upper mold box and a lower mold box for aluminum casting. The molten aluminum used to cast a graphene aluminum casting is evenly mixed with graphene powder, so there is a certain proportion of graphene inside the graphene aluminum casting. And because there is a thin layer of graphene powder on the surface of one of the EVA films, these graphene powder will adhere to the surface of the graphene aluminum casting without falling off.

A method for manufacturing graphene aluminum casting where special sand boxes are used together with vacuum evacuation to harden dry sand between two pieces of EVA film, thereby producing an upper mold box and a lower mold box for aluminum casting. The molten aluminum used to cast a graphene aluminum casting is evenly mixed with graphene powder, so there is a certain proportion of graphene inside the graphene aluminum casting. And because there is a thin layer of graphene powder on the surface of one of the EVA films, these graphene powder will adhere to the surface of the graphene aluminum casting without falling off.