Processes
Embossing and coining
Joint-area forming, why it gets specified, and what it does to real contact area.
Embossing, or coining, plastically forms the joint area of the bar to increase the real contact area at a bolted connection. It matters because apparent contact area and real contact area are not the same thing: current crosses a joint through a scattered set of small contact spots, and constriction resistance at those spots is what drives local temperature rise. Embossing is therefore specified where joint performance is being verified rather than assumed β which, under IEC 61439, is a specific and documented obligation rather than a matter of good practice.
Machines
EMAC-BP-40
400 kN CNC busbar punching and shearing machine
EMAC-BP-60
600 kN CNC busbar punching, shearing and embossing machine
EMAC-BP-80
800 kN CNC busbar punching and shearing machine
SMART-303CNC-S
300 kN all-in-one punching, shearing, bending and forming machine
SMART-603CNC-S
600 kN all-in-one busbar processing machine, 260 Γ 20 mm
SMART-603CNC-6S / 8S
600 kN all-in-one machine with 6 or 8 station turret
Technical background
Standards referenced
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