A pipe assembly includes an inner pipe member and an outer pipe member that is externally fixed to an end portion of the inner pipe member. The inner pipe has a thickness that is less than that of the outer pipe which is placed outside the end portion of the inner pipe member. An additional fixture member is placed outside the portion where the inner and outer pipes are fitted to each other. While the inner pipe, the outer pipe, and the additional fixture are in this state, an electromagnetic coil is placed inside the inner pipe at a position where the outer pipe and the additional fixture are to be fixed. The diameter of the inner pipe increases by applying a pulse current to the electromagnetic coil. The diameter of the outer pipe increases by the action of force applied when the diameter of the inner pipe is increased.

A pipe assembly includes an inner pipe member and an outer pipe member that is externally fixed to an end portion of the inner pipe member. The inner pipe has a thickness that is less than that of the outer pipe which is placed outside the end portion of the inner pipe member. An additional fixture member is placed outside the portion where the inner and outer pipes are fitted to each other. While the inner pipe, the outer pipe, and the additional fixture are in this state, an electromagnetic coil is placed inside the inner pipe at a position where the outer pipe and the additional fixture are to be fixed. The diameter of the inner pipe increases by applying a pulse current to the electromagnetic coil. The diameter of the outer pipe increases by the action of force applied when the diameter of the inner pipe is increased.

A joining method for members includes: providing a steel component 10 including insertion holes 14a and 15a, an aluminum pipe 20 having a hollow shape, and a support component 30; inserting the aluminum pipe 20 into the insertion holes 14a and 15a of the steel component 10; and enlarging the aluminum pipe 20 through deformation and joining the aluminum pipe 20 to the steel component 10 by press-fitting. The press-fit joining is performed while at least part of the support component 30 is disposed in a press-fitting region.

The objective of the present invention is to provide a molding device capable of performing press-molding accurately with respect to a material to be molded. A molding device (1) is provided with an electromagnetic coil (2), a fluid (10) which is electrically conductive and is installed along a plate-shaped material (50) on one surface side of the plate-shaped material (50), and a molding die (4) which is installed on the other surface side of the plate-shaped material (50) and is formed in such a way as to impart a molded shape to the plate-shaped material (50), wherein an electromagnetic force generated by the electromagnetic coil (2) is caused to act on the fluid (10), and the fluid (10) presses the plate-shaped material (50) against the molding die (4).

The objective of the present invention is to provide a molding device capable of performing press-molding accurately with respect to a material to be molded. A molding device (1) is provided with an electromagnetic coil (2), a fluid (10) which is electrically conductive and is installed along a plate-shaped material (50) on one surface side of the plate-shaped material (50), and a molding die (4) which is installed on the other surface side of the plate-shaped material (50) and is formed in such a way as to impart a molded shape to the plate-shaped material (50), wherein an electromagnetic force generated by the electromagnetic coil (2) is caused to act on the fluid (10), and the fluid (10) presses the plate-shaped material (50) against the molding die (4).

A method for joining members according to the present invention includes: providing a first member, a second member, a guide shaft member, a rubber member, a first plunger, a second plunger, and a drive mechanism; inserting the second member into a hole portion of the first member; inserting the guide shaft member into a through-hole of the rubber member; inserting the rubber member, into which the guide shaft member is inserted, inside the second member; arranging an assembly in which the first member, the second member, the rubber member, and the guide shaft member so as to horizontally extend; arranging the assembly so as to be sandwiched by the first plunger and the second plunger; and moving the second plunger toward the first plunger; compressing the rubber member by the first plunger and the second plunger in a direction where the guide shaft member extends, and expanding the rubber member radially outside the guide shaft member; and thus expanding and deforming at least a portion of the second member that is inserted into the hole portion to join the portion to the first member by press-fitting.

A coil unit is inserted into a tube member, an electromagnetic-forming coil part is arranged at a tube member forming position, a coil-side terminal is connected to a power-supply-side terminal of an end part of a high-voltage power supply cable, the electromagnetic-forming coil part is energized by a power supply part to electromagnetically form the tube member, the coil-side terminal and the power-supply-side terminal are separated, and the coil unit is removed from the tube member. Thus, the tube member can be separated from the high-voltage power supply cable during transport.

A coil unit is inserted into a tube member, an electromagnetic-forming coil part is arranged at a tube member forming position, a coil-side terminal is connected to a power-supply-side terminal of an end part of a high-voltage power supply cable, the electromagnetic-forming coil part is energized by a power supply part to electromagnetically form the tube member, the coil-side terminal and the power-supply-side terminal are separated, and the coil unit is removed from the tube member. Thus, the tube member can be separated from the high-voltage power supply cable during transport.

The invention is directed to a dent removing device for removing of dents in ferromagnetic sheet metals by way of inductive heating, said dent removing device comprising a working head with a housing with at least one working face foreseen to be brought in close contact with a dent in a sheet metal and at least one magnetic field generator for generating a magnetic field. According to the invention, the at least one working face comprises a recess for visual control of the dent removing, recess extending at least partially across the at least one working face.

The invention is directed to a dent removing device for removing of dents in ferromagnetic sheet metals by way of inductive heating, said dent removing device comprising a working head with a housing with at least one working face foreseen to be brought in close contact with a dent in a sheet metal and at least one magnetic field generator for generating a magnetic field. According to the invention, the at least one working face comprises a recess for visual control of the dent removing, recess extending at least partially across the at least one working face.