How to reduce the error of CNC gantry milling?
The vibration of CNC gantry milling machine generally has two kinds of forced vibration and self-excited vibration. The forced vibration may come from inside or outside the machine tool; the self-excited vibration comes from a relative vibration between the tool and the workpiece during cutting. The vibration of the machine tool directly affects the processing surface quality, productivity and the life of the machine tool itself. When the frequency of the vibration source is equal to the natural frequency of the machine tool or its multiple, the machine tool will resonate, so that the amplitude increases. In serious cases, it will even damage the moving parts, produce strong noise, and make the operator fatigue.
Prepare the processing program of CNC gantry milling machine reasonably to reduce the clearance error of the feeding mechanism. According to the analysis, when the movement direction, the feeding mechanism clearance has a great influence on the machine processing accuracy. Especially when the size accuracy of the processed parts is close to the repeated positioning accuracy of the gantry milling machine. Therefore, some corresponding measures in CNC programming and machining. During finishing, the movement of the tool in the radial direction maintains the continuous increasing trend of the size, and the movement in the axial direction maintains the continuous left trend of the size, which eliminates the influence of the reverse gap of the machine tool.
The programming error of CNC gantry milling machine, CNC machine tool processing is different from the ordinary machine tool processing, the processing accuracy of the workpiece is not only related to the processing process, but also closely related to the pre-processing programming stage. Because of the program control principle itself. Programming errors are inevitable.
The influence of interpolation error, in the economic CNC machine tool, the inclined line is formed by the tool along the two axis of the plane, so that the surface of the workpiece is zigzag and form the interpolation error. The influence factors of interpolation error include machine resolution, pulse uniformity, dynamic characteristics of control system and interpolation method and algorithm.
