Determination of interpolation method Since most machine tools only have linear and plane circular interpolation, the non-circular curve and the list curve in the contour line should be fitted by straight lines and arcs. For workpieces that require three-coordinate (or above) linkage, only spatial linear interpolation can be used, that is, the U-axis is rotated by the U-value, and different X, Y, and Z values ​​are obtained according to the contour map. For the workpiece with 2 coordinate linkage machining (one of the coordinate control advance and retract, the other two linkage coordinates are A axis and one of X, Y, Z), in order to ensure the machining quality of the workpiece and reduce the interpolation error, the expansion map is Arc segments, non-circular curve segments, and list points are first discretized into a series of new list points, which are then processed using the double arc method. Error analysis Using the previous method, the X, Y, Z, and A values ​​of each point on the cylindrical cam spiral to be machined can be calculated, but for the non-circular curve and the corner angle dU given in each step of the list curve, it is a The problem related to the error requirement is that if the dU is too small, the calculated coordinate points are too much. If the dU is too large, the accuracy requirement cannot be guaranteed. Therefore, there is a calculation method for processing the cylindrical cam of the four-axis CNC machining center, including the graphic transformation. , equidistance curves, interpolation methods, error analysis and programming. CNC machining programming is convenient for tool setting and programming. Generally, the vertex of one end of the cylindrical cam is selected as the tool point and the programmed coordinate origin. The NC machining program block diagram is as shown. The application example takes the cylindrical cam of the formula shown as an example. The bottom diameter of the cylindrical cam is 120mm, the equation of Z1 is Z1=1114t2+29144t+17, and the equation of Z2 is Z2=1114t2+27t+12, where t is the arc. When calculating the equidistant curve, the degree should be used as a parameter to determine the relationship between the displacement of the X-axis, the displacement of the circumference, and the degree. The rotation step dU1 (machining Z1 curve) and dU2 (machining Z2 curve) are each 4b, the maximum interpolation error E1=915E-4(mm), E2=811E-4(mm), double arc interpolation, numerical control Processing procedure (omitted). Conclusion Because the four-axis CNC machining center has the motion of the rotating shaft, the calculation of its motion trajectory is more complicated. The machining and programming methods introduced in this paper can process various contour curves such as cylindrical cam, zoom cylinder and special-shaped screw. All can meet the drawing requirements. (Finish) Music Sheet Stand,Foldable Guitar Stand,Keyboard Stand,Guitar Hanger GUANGZHOU GIDOO MUSICAL INSTRUMENT CO.,LTD , https://www.kaysenguitar.com