| Fluid Jet Polishing (FJP) technology is based on hydrodynamic effect to remove material. Work piece surface shape can be quantitatively corrected by controlling the injection pressure, direction and residence time. Fluid Jet Polishing (FJP), as a fine or final processing means, has a high demand for machining accuracy. Final machining effect of FJP is influenced by processing equipment mechanism, and heavily influenced by CNC system performance.Traditional jet polishing equipment adopts tandem structure with mature and simple control system, which is suitable to plane processing. Parallel platform, as a kind of polishing equipment for FJP, has higher stiffness, and better surface processing effect. However, the CNC system for parallel platform is complex. It is difficult to achieve good real-time and high stability.In this paper, CNC system building problem for FJP parallel platform was solved by adopting open CNC system which based on LINUX. The open CNC system, built under RT-LINUX environment, has the features of high modularization and good portability, which can simplify the CNC building work. This paper analyzed the internal architecture of the CNC system, modified the motion control module according to the construction features of FJP parallel machine, and the acceleration-deceleration control module according to the demand of velocity control. Besides, the whole system performances were tested by examples. Error calibration results verified that the open CNC system which was applied to FJP parallel platform, has great advantages, such as simplifying CNC system building, ensuring the stability of equipment operation. Therefore, the whole CNC system can satisfy FJP processing requirements. |
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