When making a building, engineers perform lots of give-and-take with regards to costs. They may go with a thinner wall thickness for HSS, saving on material, but handle the additional cost of additional through-plates or some other connectors so that the structure has sufficient strength. Or they could choose thicker-walled HSS to guarantee connections between structural members meet requirements. Architectural engineers may demand 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 seamless steel pipe can really shine. The device 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 along the A/B axis), that may be extremely beneficial not simply for HSS, but also for cutting various structural geometries, including wide-flange beams. By tilting, the head can cut geometries in corners, eliminating secondary operations.
This tilting enables cutting angles for bevels in addition to precise fit-up between two HSS of numerous diameters. What if you require one tube to slip in at an angle with another tube? A 3-D cutting head can cut the necessary angles to guarantee complete surface contact; that is, no gap between the two workpieces. Systems likewise have secondary tapping units to tap holes in the laser cutting work envelope (see Figures 3-7).
This done-in-one concept reduces handling and total production time, at the very least that’s the optimal. But this is much more complicated when compared to a tube cutoff operation by using a saw, and quite distinct from typical light-gauge laser cutting; again, stick weight may be thousands of pounds. As a result proper planning and inspection more important.
It starts off with the 3-D CAD model, which in the architectural world is frequently integrated into BIM, or building information modeling. The architectural industry also transfers data via files formatted as Industry Foundation Classes (IFC), an object-based building model format created by the International Alliance for Interoperability (IAI). Such files can now be imported right into machine tool software.
The application shows the way the laser cutting machine will process the hollow section steel, simulating the entire work cycle. This includes the loading automation, when a series of V arms position a fresh bit of material, be it round, rectangular, or square. The simulation then shows the master chuck grabbing into the material and pushing it through another chuck (the slave chuck) and in to the laser work envelope.
Because the material moves into position, the software reveals just where the probe will contact the workpiece. Touch sensing can be critical with heavy HSS. The probe compares the actual workpiece geometry to the one programmed inside the machine. As an illustration, the longitudinal weld in the tube production process can create distortion in extremely long HSS, along with the touch probe can make up that distortion.
The software simulates the laser cutting and (if necessary) tapping work cycle, ensuring you can find no interferences in between the processing heads and workpiece. It simulates chuck movement through the cycle after which shows how the machine will unload the finished workpiece and remnant.
This is planned before anything moves on the shop floor. This sort of simulation will manage to benefit various fabrication processes, naturally, but it really becomes more important when dealing with large sections. Moving and fabricating bad components from a 2,000-lb. tube represents plenty of wasted money and time.
Considering the length of time wide-flange beams have already been used, HSS will still be newcomers, however right now more builders are calling for them. Have a look at various building designs today, and you’ll see HSS more and more prevalent, either dominant in a building’s design or providing efficient support between wide-flange beams.
About the fabrication side, most beams being shipped to construction sites are processed through beam lines, and several of the latest technologies in that arena include elements of the done-in-one concept: stainless steel seamless tube, tapping, drilling, and a lot more, in one machine. This concept has carried to the laser cutting arena, in dexopky12 the two workpiece and multiaxis cutting heads move around in concert to produce extremely complex geometries, many considered to be too costly or simply impossible not too long ago.
Now 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 as soon as these heavy sections make it to the work site, erectors can assemble them quickly, shortening overall construction time-which, from the scheme of things, has got the most dramatic effect on construction costs. This has been core to the success of many architectural and structural fabricators lately: Do more within the controllable environment of the fabrication shop to produce things easier inside the relatively uncontrollable environment of your construction site.