The control accuracy of the CNC system is guaranteed by the motion control card and the corresponding control software. Due to the characteristics of the thermal cutting itself, the control accuracy of the numerical control system is very low, because neither the flame cutting nor the plasma arc cutting can guarantee the uniformity of the slit at the time of cutting. In addition, users may notice that most of the domestic CNC systems use pulse output. There are three reasons for this:
( 1 ) Resistance to plasma arcing interference;
( 2 ) At present, developers of cutting CNC systems in China mostly use general-purpose products developed by professional sports card companies. In analog
On the output products, they do not consider the measures against plasma arcing interference in circuit design;
( 3 ) Due to the characteristics of thermal cutting itself, the requirements for the control accuracy of the numerical control system are very low;
Another clarification here is that many users think that the numerical control system using the pulse output method is the open-loop system for the whole system, which is a wrong view. Whether the whole system is an open loop system depends on the drive used. If a servo drive is used, the position loop is closed to the servo drive; if a stepper drive is used, it is an open loop system.
There are many advanced features of the CNC system, I only talk about a very critical point. At present, there is not much difference in the flame cutting of various domestic CNC cutting systems, and there are qualitative differences in plasma arc cutting, which many users are not aware of. We know that the cutting CNC system has always contradicted the requirements of the contour speed control and cutting process of the cutting parts: the cutting process generally requires the contour speed of the parts to be cut to be consistent, but at the same time, in order to ensure the smooth cutting of the machine tool, it has to be Deceleration and acceleration operations are carried out at the corners, resulting in a drop in the quality of the cut at the corners. For flame cutting, since the cutting speed is very slow, it has little effect on the cutting quality at each corner. For plasma arc cutting, as the cutting speed is higher, the cutting quality at each corner is worse, especially for thin plate cutting. It is even more obvious, so a higher requirement is put forward for the numerical control system, that is, the speed pre-processing at the corner before cutting, based on the intersection angle of the corner line and the system parameter " centrifugal acceleration " and the currently set cutting speed. The speed at which the corner should be reduced to keep the cutting speed as much as possible. Just like driving, different speeds are adopted at different turning points, and most domestic systems do not have a speed pre-processing function at the corners, so the user can easily judge the quality of the system according to the speed change of the corner.
The convenience of CNC system maintenance and the price of maintenance, the domestic cutting special CNC system and the imported brand's cutting special CNC system, the price and service advantages are very obvious. Since the world's computer hardware is almost always produced in China and Taiwan, the hardware costs of all imported and domestic CNC systems should be the same under the same configuration, the difference is assembly production costs, transportation customs fees and foreign companies and agents. Operating costs of the business. Therefore, the manufacturing cost and sales price of the domestic numerical control system are low, which not only reduces the cost of manufacturing the CNC cutting machine, but also reduces the cost of repair and upgrade of the enterprise and the user in the future.
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