After the application technology of CNC plasma cutting machines was introduced into the domestic market in the 1980s and 1990s, after more than 20 years of digestion and absorption, it has been mastered by many cutting machine manufacturers in China, and based on this, it has developed and formed its own unique products. Some features achieve "automation, versatility, and high reliability." In some respects, the technical performance of the product even exceeds that of foreign products. The high-speed, high-precision plasma cutting processing represented by the power supply system of CNC plasma cutting machines currently has a certain user share in the domestic user market, and its relative traditional gas cutting The advantages of processing methods in cutting efficiency and processing cost are gradually being accepted and recognized by the enterprise. This article describes in detail the performance of the domestic CNC plasma cutting machine power system and makes a simple prediction for the future development direction.
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First, the performance characteristics of domestic CNC plasma cutting machine power system 1, CNC system and plasma electromagnetic compatibility technology This is the key to the success of CNC plasma cutting machine, only to solve this problem, in order to achieve plasma control under digital control.
2. Special control software that meets the requirements of thermal cutting process The characteristics of this type of control software are as follows:
(1) Using a graphical input method, more intuitive than code input, quick and easy operation.
(2) Chinese interface is more suitable for China's national conditions.
(3) The input method is diversified, and all control instructions are made.
(4) The use of automatic nesting programming software can increase plate utilization by about 10%.
3, high-power plasma system The system has a 100% duty cycle and a complete numerical control interface, arc pressure interface, remote control interface, and provide a full set of interface accessories, in order to achieve close integration with the CNC system.
Second, the development direction of the domestic CNC plasma cutting machine power system The domestic CNC plasma cutting machine power supply system analyzes the main loop, control loop, etc. from its principle or actual structure, without using integrated circuits. Although the structure is simple, there are some defects. Because the power supply line is connected to a terminal board on the machine, and then directly from the terminal board to the contactor KM. Switching on/off just the on/off control loop switch K1, which in turn controls the contactor KM. In actual use, if the contactor KM iron core jam or contact sintering occurs (this fault is very common), the cutter still has a voltage output. It is easy to turn off the failure of the power supply. From the point of view of the protection equipment and personnel or from the maintenance perspective, at least one three-phase circuit breaker with a capacity of about 30 A (calculated based on the capacity of the equipment) is required between the power supply and the contactor KM.
It is worth mentioning that, in the process of arc striking, the main loop has not been cut, and the main loop has been energized. The control loop works. J3, B4 work. There is an arc voltage on the number of B2, which is superimposed on the main loop.
In general, the manual plasma cutting machine is divided into contact arc starting and non-contact arc starting. The thickness of the manual plasma cutting machine is relative to the machine plasma cutting machine and is equipped on the CNC cutting machine. many!
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