A heat exchanger includes a plurality of heat transfer tubes housed in a predetermined case, a connecting tube body for connecting the plurality of heat transfer tubes, a predetermined tube expansion portion provided on each heat transfer tube, a first peripheral wall portion provided on the tube expansion portion, and a second peripheral wall portion that is positioned on an end portion of the connecting tube body and fitted to the tube expansion portion, wherein the first and second peripheral wall portions have different sectional shapes and are fitted together in a partial contact state including predetermined contact and non-contact portions. According to this configuration, the heat transfer tubes can be fixed to a side wall portion of the case and the connecting tube body can be connected to the heat transfer tubes easily and appropriately.

A heat exchanger includes a plurality of heat transfer tubes housed in a predetermined case, a connecting tube body for connecting the plurality of heat transfer tubes, a predetermined tube expansion portion provided on each heat transfer tube, a first peripheral wall portion provided on the tube expansion portion, and a second peripheral wall portion that is positioned on an end portion of the connecting tube body and fitted to the tube expansion portion, wherein the first and second peripheral wall portions have different sectional shapes and are fitted together in a partial contact state including predetermined contact and non-contact portions. According to this configuration, the heat transfer tubes can be fixed to a side wall portion of the case and the connecting tube body can be connected to the heat transfer tubes easily and appropriately.

Provided are a coil unit for electromagnetic forming capable of stably processing a plurality of portions in the longitudinal direction of a tubular member while preventing the contact between the tubular member and a conductor or the contact between the conductors even when the tubular member is long, and a method for producing a formed article using the coil unit. The coil unit for electromagnetic forming includes: a shaft core member made of a resin; a conductor having a wound portion, which is wound around the shaft core member, and a pair of conductor extension portions; an insulating support; and a resin coating layer formed on the outer peripheral surface of the wound portion. In the insulating support, a conductor holding portion for holding the conductor extension portions apart from each other is formed along the longitudinal direction.

Expandable devices are disclosed herein. Several of the embodiments are directed towards an expandable device configured to be expanded within a conduit. The expandable device may comprise a tubular sidewall having first portions and second portions. Radial expansion of the expandable device may cause the first portions to bow outwardly and out of radial alignment with the second portions.

Expandable devices are disclosed herein. Several of the embodiments are directed towards an expandable device configured to be expanded within a conduit. The expandable device may comprise a tubular sidewall having first portions and second portions. Radial expansion of the expandable device may cause the first portions to bow outwardly and out of radial alignment with the second portions.

An air conditioner fin assembly automatic tube expansion system based on a digital bus includes: a tube expander, a fin assembly load-fetching device, a fin accompanying tooling, interactive exchange trays, a controlled material trolley, and an electrical control device. The fin assembly load-fetching device includes an X-coordinate driving mechanism, a Y-coordinate driving mechanism, a Z-coordinate driving mechanism, and a mechanical arm including a coordinate rotating mechanism assembly and a load-fetching mechanical arm. The fin accompanying tooling is configured between the tube expander and the fin assembly load-fetching device. At least two interactive exchange trays are configured and clamped to the fin accompanying tooling. At least two controlled material trolleys are included and docked on an inner or an external side of the fin assembly load-fetching device.

An air conditioner fin assembly automatic tube expansion system based on a digital bus includes: a tube expander, a fin assembly load-fetching device, a fin accompanying tooling, interactive exchange trays, a controlled material trolley, and an electrical control device. The fin assembly load-fetching device includes an X-coordinate driving mechanism, a Y-coordinate driving mechanism, a Z-coordinate driving mechanism, and a mechanical arm including a coordinate rotating mechanism assembly and a load-fetching mechanical arm. The fin accompanying tooling is configured between the tube expander and the fin assembly load-fetching device. At least two interactive exchange trays are configured and clamped to the fin accompanying tooling. At least two controlled material trolleys are included and docked on an inner or an external side of the fin assembly load-fetching device.

A testing method for a joined body, in which a second pipe member having an outer diameter smaller than that of a first pipe member having at least one through hole is inserted into the first pipe member and the second pipe member is expanded to form a joining portion, the testing method includes: applying an elastic wave vibration to the joined body of the first pipe member and the second pipe member, for plural visual field regions at different positions in a circumferential direction of the joined body, acquiring a vibration distribution of the second pipe member measured through the through hole and a vibration distribution of the first pipe member in a visual field region including the joining portion of the first pipe member and the second pipe member, which are measured optically and in a batch, and determining quality of joining in the entire joining portion based on the acquired vibration distributions.

An expander of a tubular assembly having a tubular covering element inserted into a tubular element includes a tip for pushing a first internal wall of the tubular covering element towards a second internal wall of the tubular element so as to enable the adhesion of a first external wall of the tubular covering element to the second internal wall. The expander includes a rotary joint sliding along a first longitudinal axis, to which the tip is coupled so as to arrange the tip radially and enable it to rotate around the first axis. The expander further includes a sensor operatively connected to the tip to detect a radial displacement of the tip owing to a current thrust exerted by the tip, and a logic control unit operatively connected to the sensor and the tip to adjust a future thrust as a function of the radial displacement.

An expander of a tubular assembly having a tubular covering element inserted into a tubular element includes a tip for pushing a first internal wall of the tubular covering element towards a second internal wall of the tubular element so as to enable the adhesion of a first external wall of the tubular covering element to the second internal wall. The expander includes a rotary joint sliding along a first longitudinal axis, to which the tip is coupled so as to arrange the tip radially and enable it to rotate around the first axis. The expander further includes a sensor operatively connected to the tip to detect a radial displacement of the tip owing to a current thrust exerted by the tip, and a logic control unit operatively connected to the sensor and the tip to adjust a future thrust as a function of the radial displacement.