Abstract: An arc brazing method of bonding different materials includes disposing an aluminum alloy to be bonded on a steel base material and arc brazing a welded portion between the steel base material and the aluminum alloy using a wire. The wire is an alloy containing Zn. It is possible to compensate for brittleness due to the bonding of different materials and to improve wettability.

Abstract: A welding method includes: forming one or more lower plate grooves having a predetermined width and a predetermined depth at one side of an upper surface of a lower plate; forming one or more upper plate grooves having a predetermined width and a predetermined depth at one side of a lower surface of an upper plate; overlapping the lower plate and the upper plate so that the lower plate grooves of the lower plate and the upper plate grooves of the upper plate mesh with one another; and performing welding to form a bead at a welding part.

Abstract: A composite casting system for manufacturing a heterogeneous material casting product may include a fixed mold; a movable mold for opening or closing one side of the fixed mold; a slide core pin provided inside the fixed mold or the movable mold, and capable of being protruded to a cavity side, which is formed by a combination of the fixed mold and the movable mold, from the inside of the fixed mold or the movable mold; a high-pressure casting device for injecting high-pressure casting molten metal into the cavity; and a gravity casting device for injecting gravity casting molten metal through a gravity casting hole formed on the fixed mold or the movable mold.

Abstract: A centrifugal casting apparatus is provided. The centrifugal casting apparatus includes an upper mold machined to have an inner contour used to form an upper side surface of a casting, and a lower mold machined to have an inner contour used to form a lower side surface of the casting. An upper motor provides power to rotate the upper mold and a lower motor provides power to rotate the lower mold. The upper motor and the lower motor are operated independently of each other.

Abstract: A vacuum centrifugal casting apparatus includes an upper mold having an upper vacuum hole communicating with both a cavity and a space over the upper mold, a lower mold including a lower vacuum hole corresponding to the upper vacuum hole, the lower vacuum hole communicating with both the cavity and a space under the lower mold, a motor configured to rotate the upper mold and the lower mold, a vacuum retaining member having an outer diameter corresponding to the upper vacuum hole, with a molten metal injection hole formed in an upper end of the vacuum retaining member, and a vacuum pump configured to be operated by the motor, and including an inlet communicating with the lower vacuum hole, and an outlet formed to exhaust drawn air.

Abstract: A composite casting system for manufacturing a heterogeneous material casting product may include a fixed mold; a movable mold for opening or closing one side of the fixed mold; a slide core pin provided inside the fixed mold or the movable mold, and capable of being protruded to a cavity side, which is formed by a combination of the fixed mold and the movable mold, from the inside of the fixed mold or the movable mold; a high-pressure casting device for injecting high-pressure casting molten metal into the cavity; and a gravity casting device for injecting gravity casting molten metal through a gravity casting hole formed on the fixed mold or the movable mold.

Abstract: A centrifugal casting apparatus for different materials may include a mold having a shape corresponding to a shape of an outer surface of a casting to be produced, and having a cavity receiving molten metals therein, a molten metal guide inserted into the mold and configured to guide the molten metals so that the molten metals are separately injected into the mold, a guide fixing support fixing the molten metal guide to a predetermined position, and a motor configured to rotate the mold around a rotation axis.

Abstract: A damper pulley for a crankshaft includes a hub mounted on one end of the crankshaft, a rim connected to the hub, an oil seal mounted on an outer surface of the hub, and a wear-resistant insert member integrally mounted on the hub and making contact with the oil seal.

Abstract: A vacuum centrifugal casting apparatus includes an upper mold having an upper vacuum hole communicating with both a cavity and a space over the upper mold, a lower mold including a lower vacuum hole corresponding to the upper vacuum hole, the lower vacuum hole communicating with both the cavity and a space under the lower mold, a motor configured to rotate the upper mold and the lower mold, a vacuum retaining member having an outer diameter corresponding to the upper vacuum hole, with a molten metal injection hole formed in an upper end of the vacuum retaining member, and a vacuum pump configured to be operated by the motor, and including an inlet communicating with the lower vacuum hole, and an outlet formed to exhaust drawn air.

Abstract: A damper pulley for a crankshaft includes a hub mounted on one end of the crankshaft, a rim connected to the hub, an oil seal mounted on an outer surface of the hub, and a wear-resistant insert member integrally mounted on the hub and making contact with the oil seal.

Abstract: A centrifugal casting apparatus for different materials may include a mold having a shape corresponding to a shape of an outer surface of a casting to be produced, and having a cavity receiving molten metals therein, a molten metal guide inserted into the mold and configured to guide the molten metals so that the molten metals are separately injected into the mold, a guide fixing support fixing the molten metal guide to a predetermined position, and a motor configured to rotate the mold around a rotation axis.

Abstract: A centrifugal casting apparatus is provided. The centrifugal casting apparatus includes an upper mold machined to have an inner contour used to form an upper side surface of a casting, and a lower mold machined to have an inner contour used to form a lower side surface of the casting. An upper motor provides power to rotate the upper mold and a lower motor provides power to rotate the lower mold. The upper motor and the lower motor are operated independently of each other.

Abstract: A differential carrier case with an inserted pipe for high pressure casting may include a mold core into which a first end of a pipe is inserted, a mold core pin fixed to the mold core to fix the mold core and the first end of the pipe, a drive core pin inserted into a second end of the pipe, and a thick portion surrounding an outer portion of the pipe.

Abstract: A differential carrier case with an inserted pipe for high pressure casting may include a mold core into which a first end of a pipe is inserted, a mold core pin fixed to the mold core to fix the mold core and the first end of the pipe, a drive core pin inserted into a second end of the pipe, and a thick portion surrounding an outer portion of the pipe.

Abstract: A core pin is provided that prevents a molten metal from flowing into a pipe and a casting device using the same is also provided. The core pin specifically contacts a first end of the pipe inserted into a mold to close the end of the pipe, to thus prevent the molten metal from flowing into the pipe.

Abstract: A mold apparatus for high pressure casting includes an upper mold having an internal space filled with a molten metal and a core pin elevating groove at an inner wall of the upper mold. A lower mold is disposed at a lower part of the upper mold and fixed with an insert. A core pin portion is elevatably installed in the core pin elevating groove to be elevated depending on a filling pressure of the molten metal filled in the internal space.

Abstract: A core pin is provided that prevents a molten metal from flowing into a pipe and a casting device using the same is also provided. The core pin specifically contacts a first end of the pipe inserted into a mold to close the end of the pipe, to thus prevent the molten metal from flowing into the pipe.