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Linde CNC universal cutting machine 
Linde CNC universal cutting machine 
Groove cutting innovation
For 25 years, Linde Co., Ltd. (hereinafter referred to as Linde), which is dedicated to the design of rotating equipment with rotating equipment, has been providing customers with special flame and plasma cutting solutions. Other flame cutting machine manufacturers also use Linde's rotating device, whose rotary plasma torch can cut at ±45o. Automated plasma bevel cutting is highly demanding for CNC systems. Due to the angular error, complex adjustments must be made to the height of the cutting head, which cannot be achieved with standard components. The pitch of the bevel cut or the ideal flash point cannot be controlled sufficiently by the arc voltage as the straight edge cutter.
The plasma beam is slower (inert) than the laser beam, the laser propagates at the speed of light, and the plasma beam can only reach supersonic speed. If the position of the plasma exit changes rapidly, it will delay as the cutting head moves. In this case, if the cutting parameters are not set correctly, the cutting accuracy will be degraded.
During plasma cutting, the gas is ionized in the arc between the nozzle (cathode) and the workpiece (anode). At the moment of contact with the workpiece, the reconstituted energy is rapidly released and the metal is immediately vaporized at a high temperature of 30 000 °C. If a square is cut with a plasma beam, then the weak link is the part of the anode that eventually falls, causing the edge or corner of the cut to melt out of control and eventually become a waste or defective product. The reason is that the electric alignment is missing in a short time, and the beam "looks" the opposite pole in the remaining material.
Magnetization and inertia have a negative impact on the quality of the kerf. The consequences of this physical property cannot be completely eliminated, but the impact can be minimized. Advanced control technology can effectively compensate for this technical defect. The focus of the adjustment control technology is on the compensation of the torch height, cutting speed and slit offset. If the torch is also to be used for bevel cutting, the torch spacing must be compensated.
High-precision cutting groove sample
"All in one", mechanical manufacturing is aligned with mobile communications
It is wise to focus mobile communication technologies on one platform in the field of machine building. The integration of the manufacturing process reduces the time required for preparation, making the short process chain possible and ultimately reducing production costs. Linde recently developed a CNC all-round cutting machine with control system using Aikeman's CNC technology. On one platform, there are not only plasma and flame cutting (including groove), but also drilling, milling and hitting. Standard. The front of the rack of this "KingP4500" machine is equipped with a plasma rotating device for bevel cutting and a flame unit. The rear of the frame is equipped with a drill collar tapping unit and a pin marking machine. The frame itself is moved by means of a "gantry axis". The machine is also equipped with a tool changer and a probe that measures the length of the tool.
The "KingP4500" machine plays a key role in controlling electronic technology in research and development. Plasma and flame cutting are particularly challenging for CNC systems because high quality cutting results require complex compensation. Linde's special machine also requires the integration of different process control technologies. It is not enough to have standard components. It needs to be modified for specific applications to make it a reasonable automation solution.
Medium-sized machinery manufacturers often do not have the ability to keep up with the ever-changing development of electronic control technology, so in particular when manufacturing similar models, manufacturers prefer to work with automation professionals so that they can focus on their core competencies. If you can draw on other manufacturers' products or proven processes in specific industry applications, the machines can be built faster and at lower cost.
For an equal, mutually beneficial and innovative partnership, automation technology partners must be well versed in the requirements of their specific industry. Since the 1970s, Aikeman Group has been developing electronic control systems for machines and production lines. Its business department “Embedded Control Systems†provides control electronics and R&D services for CNC solutions. In recent years, the company has especially benefited from outstanding achievements in cutting technology.
Perfect groove cutting
The plasma unit can be adjusted not only for height but also for straight and groove cutting. In plasma cutting, the distance between the plasma nozzle and the workpiece is measured and adjusted by the arc voltage, and when the groove is cut, because the nozzle is inclined at this time, the height and angle are constantly changing, so the accurate pitch tracking depends only on the arc. The voltage is not accurate. Bottom line: Regular height adjustment is very inaccurate in the CNC-"Royal Iron Law" groove cutting.
By using a scanning pen to scan the surface of the workpiece in advance, the CNC system can obtain a true correction value during the cutting process to control the spacing. The numerical control system corrects the height (Z-axis) based on the measured value. The scanning of the surface of the workpiece is of course only necessary when cutting the groove, and the correction parameters can be deleted afterwards. The height of the nozzle will be additionally compensated online by the angle of inclination of the B-axis. The control of the flame unit uses a capacitor height adjustment, which is fixed to the Y-axis as well as the plasma unit.
Intelligent control to complete compensation
The difficulty of plasma cutting CNC solutions is the compensation method. Only a few plasma cutting equipment manufacturers have mastered the plasma technology to effectively reduce the disadvantages caused by physical properties. In Linde's machine, the position of the tilting axis of the plasma torch, the cutting speed, the slit offset and the torch distance are compensated by the internal control of the CNC through the compensation list. These compensation tables can be input to the operator terminal and docked.
The compensation table was produced mainly on the basis of the so-called workshop-oriented programming (WOP) draft. Technicians can enrich their knowledge and experience directly on the machine, which means that tool calibration tables can be made based on experience and can be added at any time. Initially only a single work point needs to be set up, and the operator can continue to add more work points through the input during the operation. These are all freely selectable, sometimes they can be arranged side by side, and sometimes they can be arranged at large intervals. These work points can be interpolated with each other. The working points of the edge regions are closely arranged when the groove is cut, so as to better solve the nonlinear relationship occurring here and compensate for the control technology. This will improve the control accuracy and ultimately achieve a high grade bevel.
In order to make it easier for the user to operate the machine and ensure the independence of the CAD/CAM system, all compensation and contour adjustments are done by the machine itself. The CAD/CAM software used by Linde is "PROfi rst CAM". By embedding control-specific DIN commands through Aikeman's programmed preprocessor, the controller can be independent of the CAD/CAM system it uses.
The first priority of the Arkman preprocessor, which is used after the CAD-post processor, is to provide the operator with a list of required boring and tapping tools. This simple method is complementary to the lack of CAD/CAM systems. Tool management because the CAD/CAM system only focuses on flame cutting. In addition to this, the scanning cycle of the previously described groove cutting is added by Aikeman's preprocessor to make the problem limited to the ±45o axis of rotation relieved by the front and rear rotation cycles.
Aikeman's NC operating system supports all cutting-specific functions such as Z-adjustment, tangential tool reset (tracking), path-dependent speed control (laser performance) and nested conversion (intersecting line cutting).
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