Thermal caulking device

A thermal caulking device which joins a first member to a second member by melting a boss of the second member being inserted into a through-hole formed in the first member and projecting inwardly from an inner circumferential surface of the first member, the first member having a cylindrical shape and a width gradually increasing from a bottom surface of the first member to an upper surface of the first member, the thermal caulking device comprising:

• a heat tip having
• a main body section whose outer circumferential surface is formed to extend along the inner circumferential surface of the first member and
• two plate-like terminal sections extending radially from the main body section and connected to an inner circumferential surface of the main body section;
• and
• a power supply unit arranged above the heat tip and configured to supply electricity to the main body section via the terminal sections,
• wherein:
• at least either of the main body section and the terminal sections has a non-uniform thickness in a predetermined direction, and
• a thickness of the main body section of a connecting portion side connected to each of the terminal sections is larger than a thickness of a remaining portion thereof except for the connecting portion side connected to each of the terminal sections.

A thermal caulking device which joins a first member to a second member by melting a boss of the second member being inserted into a through-hole formed in the first member and projecting inwardly from an inner circumferential surface of the first member, the first member having a cylindrical shape and a width gradually increasing from a bottom surface of the first member to an upper surface of the first member, the thermal caulking device comprising:

• a heat tip having
• a main body section whose outer circumferential surface is formed to extend along the inner circumferential surface of the first member and
• two plate-like terminal sections extending radially from the main body section and connected to an inner circumferential surface of the main body section;
• and
• a power supply unit arranged above the heat tip and configured to supply electricity to the main body section via the terminal sections,
• wherein:
• at least either of the main body section and the terminal sections has a non-uniform thickness in a predetermined direction, and
• a thickness of an outer portion of each of the terminal sections where each terminal section is connected to a wide side of the main body section, is smaller than a thickness of an inner portion of each of the terminal sections where each terminal section is connected to a narrow side of the main body section.