A crankshaft for an internal combustion engine is provided. The crankshaft comprises at least four main journals aligned on a crankshaft axis of rotation defining a centerline. The crankshaft further comprises at least three pin journals. Each pin journal is disposed about a respective pin journal axis and positioned between the main journals. Each of the pin journals is joined to a pair of crank arms. Each pair of crank arms is joined to a respective main journal. Each of the main journals, pin journals, and crank arms is made of a first metallic material. Each crank arm has an over-molded counterweight metallurgically bonded thereto. Each counterweight is disposed opposite a respective pin journal relative to the centerline for balance and stability. Each counterweight is made of a second metallic material. The crankshaft has a weight ratio of the second metallic material to the first metallic material of between 0.20 to 0.50.

A process manufactures a metal part for a turbomachine that includes first and second metal materials with different chemical compositions. The process includes the steps of obtaining an element of which at least a first metallic part is made of the first metallic material and placing the element in a first mold and pouring wax into the mold to at least partially cover the element. The first mold has an impression corresponding to at least part of an external surface of the metal part. The process further includes obtaining an assembly by removing the first mold and making a shell mold with a first ceramic around the assembly. The process also includes removing the wax from the shell mold and pouring the second metal material into the shell mold in place of the wax, and removing any ceramics present in the assembly.

A process manufactures a metal part for a turbomachine that includes first and second metal materials with different chemical compositions. The process includes the steps of obtaining an element of which at least a first metallic part is made of the first metallic material and placing the element in a first mold and pouring wax into the mold to at least partially cover the element. The first mold has an impression corresponding to at least part of an external surface of the metal part. The process further includes obtaining an assembly by removing the first mold and making a shell mold with a first ceramic around the assembly. The process also includes removing the wax from the shell mold and pouring the second metal material into the shell mold in place of the wax, and removing any ceramics present in the assembly.

Systems and methods for co-casting of additively manufactured, high precision Interface Nodes are disclosed. The Interface Node includes an integrated structure including one or more complex or sophisticated features and functions. Co-casting of Interface Nodes by casting a part onto the Interface Node results in a hybrid structure comprising the cast part and the additively manufactured Interface Node. The interface node may include at least one of a node-to-tube connection, node-to-panel connection, or a node-to-extrusion connection. In an embodiment, engineered surfaces may be provided on the Interface Node to improve the blend between the Interface Node and the cast part during the co-casting process.

Systems and methods for co-casting of additively manufactured, high precision Interface Nodes are disclosed. The Interface Node includes an integrated structure including one or more complex or sophisticated features and functions. Co-casting of Interface Nodes by casting a part onto the Interface Node results in a hybrid structure comprising the cast part and the additively manufactured Interface Node. The interface node may include at least one of a node-to-tube connection, node-to-panel connection, or a node-to-extrusion connection. In an embodiment, engineered surfaces may be provided on the Interface Node to improve the blend between the Interface Node and the cast part during the co-casting process.

A ring for a connection element includes a contact portion intended to cooperate with a contact surface of another ring and a fastening portion intended to be secured to a support. The contact portion is made of a first metallic material and the fastening portion is made of a second metallic material, the hardness of the first material being substantially greater than that of the second material, and the toughness of the second material being substantially greater than that of the first material, the contact portion and the fastening portion being of one piece construction.

A ring for a connection element includes a contact portion intended to cooperate with a contact surface of another ring and a fastening portion intended to be secured to a support. The contact portion is made of a first metallic material and the fastening portion is made of a second metallic material, the hardness of the first material being substantially greater than that of the second material, and the toughness of the second material being substantially greater than that of the first material, the contact portion and the fastening portion being of one piece construction.

A mold is used to form a solder joint to join the distal end of the guidewire to a wire coil. The mold has a cavity that can have different configurations so that the solder joint can be any of bullet shaped, micro-J shaped, cone shaped, truncated cone shaped, or have a textured surface.

An insert including a taper is covered with a molten metal. A metal molded product with the insert joined thereto is generated by semi-cooling the molten metal to a press-fitting temperature which is higher than a recrystallization temperature of the molten metal and lower than a melting point of the molten metal. A fitting hole which is filled with the insert is formed in the metal molded product. The taper is fitted into the fitting hole. An undercut is not formed in front of a tip of the taper. The insert is press-fitted into the fitting hole while pressing and extending the fitting hole with the taper in a thinning direction of the taper at a press-fitting temperature. The metal molded product is further cooled with the press-fitting maintained.

An aluminum-silicon carbide composite including flat-plate-shaped composited portion containing silicon carbide and an aluminum alloy, and aluminum layers containing an aluminum alloy provided on both plate surfaces of composited portion, wherein circuit board is mounted on one plate surface and the other plate surface is used as heat-dissipating surface, wherein: the heat-dissipating-surface-side plate surface of the composited portion has a convex curved shape; the heat-dissipating-surface-side aluminum layer has a convex curved shape; ratio (Ax/B) between the average (Ax) of the thicknesses at the centers on opposing short sides of outer peripheral surfaces and thickness (B) at central portions of the plate surfaces satisfies the relationship: 0.91≤Ax/B≤1.00; and a ratio (Ay/B) between the average (Ay) of the thicknesses at the centers on opposing long sides of outer peripheral surfaces and thickness (B) at central portions of the plate surfaces satisfies the relationship: 0.94≤Ay/B≤1.00 and production method therefor.