| With the development of science and technology, especially with the progress of electronic technology, computer application and automation theory, industrial production has undergone dramatic change, so has cutting industry. With the studying depth of the cutting technique and the development of the cutting production automatization and flexible, it advanced more urgent needs to precise control and flexible of cutting power itself. Digital control used software instead of analog and digital instruments, and then it enhanced the product integration; promoted the flexibility and intelligence of the system. The digital control has become one of cutting power's development trends. Therefore, this research has a widespread practical significance and application prospect.In the paper, the design used dual-core structure digital signal processor TMS320LF2407A and STC89C58RD+ as the control core of the cutting power. It made fully use of the fast operating speed and strong data processing of DSP and the strong control ability advantages of single chip microcomputer to realize the real-time and effective on-line control of the plasma arc cutting process. Thus, it improved the control accuracy and response characteristic of the cutting power, realized the effective adjustment of plasma arc pulsation characteristic, and enhanced its current output up to 200A.In view of the non-linear volt-ampere characteristic and multi-parameters strong-coupling cutting technological process of the plasma arc, using the digitized controller hardware platform developed in the paper, it developed the cutting experiment based on the fuzzy-PID neural network technical control strategy. The experimental result showed that the technical control strategy well solved the fatal problem that the traditional setting-value constant current closed-loop control neglected that other cutting technological parameters'change would affect the cutting quality. Finally, did comparing cutting experiments on the cutting ability and quality of the digitized inverted plasma arc cutting power whose cutting current was 200A. The cutting experiments not only validated the cutting power's advantage, but also obtained a set of correlative cutting data which was able to instruct the practical application. |
