Increasing the machining e ciency of middle speed wire electrical discharge machining (MS-WEDM) is usually through optimizing process parameters, but the discharge servo parameters of the servo controller can also be optimized to achieve the same purpose. This paper develops a multi-mode servo controller for MS-WEDM to investigate discharge servo parameters. Firstly, the structure and control principle of the servo controller are introduced, and the core functions are described in detail. Secondly, it introduces the discharge servo parameters that can be optimized: gap state threshold and feedback period. At the same time, the platform speci cations and parameters for optimization experiments are introduced. Thirdly, the experimental scheme and result analysis of parameter optimization are described, and the optimized parameters are obtained. Finally, different machining experiments are carried out for the multi-mode of the servo controller to investigate the effectiveness and practicability of the different machining servo modes. In the parameter optimization and machining experiments, the recording function of the servo controller was used to draw the speed curve, and the servo response effects of different servo modes was obtained.
At present, the focus of CNC technology is mainly towards open CNC systems and cloud manufacturing. But the motion control of the CNC system is still mainly composed of interpolation and motion execution. In order to improve the accuracy and quality of interpolation, the applied algorithms are becoming more and more complex. When encountering complex trajectories, minor modifications require complex calculations. To solve this problem, a new CNC system architecture is proposed, that is, adding processing functions after interpolation. Put the minor modification of the trajectory after the interpolation. The article first introduces the CNC architecture with offline interpolation post-processing (OIPP). Then the Interpolation Byte Stream (IBS) format used to represent the interpolation data is introduced. Since the IBS format has the dual characteristics of geometry and string, geometric transformation and text processing both can be used in processing operation. On the basis of the software program and the matching motion controller, the WEDM-CNC system with post-interpolation processing function is implemented. The interpolated data transmission in the developed system adopts a dual-pointer structure, which can effectively control the data transmission. Finally, the feasibility of the new CNC system was verified through machining experiments. Experiments show that offline interpolation post-processing can modify the interpolated data with high precision and flexibility.
Offset compensation is an indispensable functional module in the current CNC system. But offset compensation is not only used to improve machining accuracy, but also can be used to modify path. This paper first discusses the origin of the curve offset in the CNC system, and points out that the essence of the offset curve is a method of path modification. Then the general formula for offset compensation of plane curve is obtained through normalization. Then the classification of offset compensation is explained. Finally, line segments, arcs and B-spline curves are taken as examples to verify the feasibility and practicability of the offset compensation method applied to path processing. The offset compensation method is a flexible and effective path modification method.
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