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When designing a building, engineers perform lots of give-and-take when it comes to costs. They can select a thinner wall thickness for HSS, saving on material, then again deal with the additional expense of additional through-plates or another connectors to be sure the structure has sufficient strength. Or they could choose thicker-walled HSS to make certain connections between structural members meet requirements. Architectural engineers may require connections between HSS, or connect HSS to wide-flange beams. It’s a continual balancing act.

This balancing act can be easier-and this is when hollow section steel tube can really shine. The equipment effectively makes complex geometries at HSS end sections inexpensive to fabricate. Six-axis laser cutting heads create complex bevels in addition to tab-and-slot arrangements to simplify fit-up. This can include tilting back and forth (moving over the A/B axis), which is often extremely beneficial not simply for HSS, however, for cutting various structural geometries, including wide-flange beams. By tilting, the pinnacle can cut geometries in corners, eliminating secondary operations.

This tilting allows for cutting angles for bevels along with precise fit-up between two HSS of different diameters. What if you require one tube to slip in in an angle with another tube? A 3-D cutting head can cut the necessary angles to make certain complete surface contact; that is certainly, no gap between your two workpieces. Systems have secondary tapping units to tap holes within the laser cutting work envelope (see Figures 3-7).

This done-in-one concept reduces handling and total production time, at least that’s the best. But this is actually complicated than the usual tube cutoff operation with a saw, and quite distinct from typical light-gauge laser cutting; again, stick weight can be a large number of pounds. As a result proper planning and inspection a lot more important.

It starts with the 3-D CAD model, which in the architectural world is usually incorporated into BIM, or building information modeling. The architectural industry also transfers data via files formatted as Industry Foundation Classes (IFC), an item-based building model format developed by the International Alliance for Interoperability (IAI). Such files can now be imported straight into machine tool software.

The application shows just how the laser cutting machine will process the hollow section steel, simulating the entire work cycle. This can include the loading automation, when a number of V arms position a whole new piece of material, whether it is round, rectangular, or square. The simulation then shows the master chuck grabbing to the material and pushing it through another chuck (the slave chuck) and in the laser work envelope.

Because the material moves into position, the software reveals just where the probe will contact the workpiece. Touch sensing may be critical with heavy HSS. The probe compares the particular workpiece geometry on the one programmed within the machine. As an example, the longitudinal weld within a tube production process can produce distortion in extremely long HSS, as well as the touch probe can account for that distortion.

The software simulates the laser cutting and (if required) tapping work cycle, ensuring you will find no interferences involving the processing heads and workpiece. It simulates chuck movement through the entire cycle after which shows the way the machine will unload the finished workpiece and remnant.

All this is planned before anything moves towards the shop floor. This kind of simulation will benefit a number of fabrication processes, needless to say, but it becomes even more important facing large sections. Moving and fabricating bad components coming from a 2,000-lb. tube represents lots of wasted time and expense.

When considering just how long wide-flange beams happen to be being used, HSS are still newcomers, however more builders are calling for these people. Have a look at various building designs today, and you’ll see HSS starting to be more prevalent, either dominant within a building’s design or providing efficient support between wide-flange beams.

On the fabrication side, most beams being shipped to construction sites are processed through beam lines, and some of the latest technologies because arena include facets of the done-in-one concept: stainless steel seamless tube, tapping, drilling, and much more, all in one machine. This idea has carried to the laser cutting arena, in dexopky12 the workpiece and multiaxis cutting heads move in concert to generate extremely complex geometries, many regarded as too costly or perhaps impossible a little while ago.

The laser made these possible and cost-effective, because process simulation, touch probing, as well as the done-in-one concept reduce overall fabrication time. And when these heavy sections make it to the work site, erectors can assemble them quickly, shortening overall construction time-which, within the scheme of things, provides the most dramatic effect on construction costs. It has been core to the achievements many architectural and structural fabricators lately: Do more from the controllable environment in the fabrication shop to help make things easier within the relatively uncontrollable environment in the construction site.

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