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Plasma cutting process control for fabric


Posted by on 25 Dec 2011 12:08 CNC Plasma Cutting
The MultiCam EZ Knife system was developed to serve markets that require mechanized knife cutting, creasing, and perforation operations. The EZ Knife system supports tangential drag, oscillating and ultrasonic cutting techniques. Choose from many blade types including rotary, spear point, utility, and more. EZ Knife can be purchased as a stand-alone CNC machine based on the MultiCam 1000 Series and 3000 Series motion platforms and can also be added as an option to the 1000, 3000 Router and Plasma Series. What makes EZ Knife special? For one, EZ Knife only works on a Multicam and second, no other knife system is as powerful and reliable as a MultiCam.
Compared to other mechanized knife cutters, MultiCam is the heaviest built. MultiCam high performance motion systems, all steel construction and a vast range of process area sizes bring a new level of performance and utility to knife cutting. MultiCam machines are heavy, powerful and accurate so moving a knife blade is EZ. Why are they so heavy duty? Because the same MultiCam can also move a ninety pound high-frequency spindle through solid wood, thick acrylic and aluminum. Ask yourself; what other knife system cuts such a wide envelope of materials? Only one, the MultiCam EZ Knife system! EZ Knife is applicable to many markets. Point of Purchase and Graphic Art professionals use EZ Knife as part of their digital finishing workflow. Images that have been printed on wide format digital printers are easily registered using the exclusive MultiCm MultiVision digital registration system. The printed images are placed on the MultiCam outfitted with EZ knife and the cut process is completed in perfect registration. When combined, MultiVision and EZ Knife make a powerful digital finishing solution!The 1000 Series Plasma features dual drives, an engineered aluminum extrusion frame, 25mm bearings throughout, and state-of-the-art Hypertherm plasma units, as well as the legendary ease-of-use of the MultiCam Controller. Graphic artists wrap designs onto boxes and other POP displays. EZ Knife can assist this process by creasing, perforating and cuttting corrugated and other cardboard materials, for sample making and short-run packing. The HVAC industry uses EZ Knife to cut acoustic liners such as fiberglass and closed-cell foam. Both fiberglass and closed cell foam are used to acoustically insulate steel HVAC ductwork. EZ Knife works with both rotary knife blades and oscillating knives. EZ Knife cuts single-ply materials for the boating industry and other similar upholstery applications. Single-ply phenolic and composite materials are hard to cut with conventional knife technologies EZ Knife offers an ultrasonic option to challenge these tough applications.3000 Series Plasma is the perfect choice for those looking for value in a machine tool quality CNC Plasma Cutting System. The rigid, all-steel plate frame design supports a variety of standard or high-definition plasma units and is combined with the industry's easiest -to-use operator interface, as well as the quality features, and high level of service that comes with owning.
ESAB Cutting Systems of Florence, S.C., has designed both waterjet and plasma arc cutting systems for years. In January of this year, the twain met in a combination cutting system. Parts manufacturers use waterjet cutting to make the intricate cuts of internal geometry, then use plasma arc cutting to make high-speed perimeter cuts. For example, waterjets cut bolt holes in stainless steel flanges whose edges are plasma cut. Motor housings and components in off-road vehicles and construction equipment are also often waterjet and plasma cut."Because the two cutting processes are traditionally performed at different locations, there is always the chance of losing some cutting accuracy," said Jeff DeFalco, product manager at ESAB. "This is compounded when the part is inkjet or plasma marked for bin storage or further processing at other locations. ESAB's combination system performs all these functions with the part at a single position." The hybrid cutting system is built on ESAB's Hydrocut gantry-style waterjet systems. A rail runs along both sides of the cutting table, providing the longitudinal axis. A beam spanning the rail gauge, serving as the latitudinal axis, carries a cross carriage upon which the waterjet and plasma cutting heads are mounted. Thus, the Hydrocut is an xyz axis machine. The rails are about 8 inches from the floor, so wide or large workpieces can be placed on the cutting tables, which range from 8 to 20 feet wide, and up to 75 feet long. First, the waterjet makes internal cuts, and then the plasma arc system makes perimeter cuts. If neede , inkjet and plasma marking heads do their job after that. Laser sensors pinpoint the position of a workpiece, and height control sensors make adjustments in the case of uneven plates. A planetary drive system powered by ac brushless motors moves the cutting heads to within 0.007 inch accuracy and 0.003 inch repeatability, at cutting speeds ranging from 0.01 to 750 inches per minute. Computer numerical controls direct the cutting and marking processes. "We make our own CNC hardware and write our own software for waterjet and plasma cutting," said Joe Blackmon, ESAB marketing manager. Axial piston pumps, ranging from 30 to 200 hp and using variable displacement, generate a waterjet pressurized up to 60,000 psi. The stream travels through nozzles ranging from 0.020 to 0.065 inch, and emerge from the cutting head's diamond orifice, available in sizes from 0.003 to 0.022 inch. The larger orifice and nozzle sizes can accommodate the greater water and abrasive flows needed to make thicker cuts. A pre-aligned cartridge body, orifice, and focusing tube provide a tightly focused waterjet to cut faster while consuming less abrasive. The Etch-Delete plasma cutting torch charges the cutting gases, either oxygen, nitrogen, argon/hydrogen, or air itself, with 100 to 1,000 amps, depending on the material being cut. For plasma marking, the CNC's software varies the current sent to the plasma arc torch to ramp up or ramp down when the torch is started, stopped, or makes a curve in the material. "This makes marks cut into the metal more legible," Blackmon said.

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The work on the machine, program selection, control programs
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