Analysis of machining process of CNC machine tools

1. Analyze the dimensioning method in the part drawing

Figure 1 Unified reference labeling method

The method of engraving the size or directly labeling the coordinate size with the same reference is a unified reference labeling method. The marking method (shown in Figure 1) is most in line with the processing characteristics of the CNC machine tool, which is convenient for programming, and maintains the design basis and process benchmark. The consistency of the measurement reference with the workpiece origin setting. Designers often consider the factors of assembly and use characteristics when dimensioning, and often use the method of local dispersion (shown in Figure 2). This kind of labeling brings many inconveniences to the process arrangement and NC programming. The decentralized labeling method is changed to the unified reference labeling method. Because of the high precision of CNC machining and the accuracy of repeated positioning, the unified reference labeling method does not produce large cumulative errors.

Figure 2 Decentralized reference labeling method

The geometric element conditions that make up the contour of the part are an important basis for NC programming. When manually programming, calculate the coordinates of each node that constitutes the contour of the part. When programming automatically, define all the geometric elements that make up the contour of the part. If one condition is not enough, the node coordinates of the part outline and the geometry of the part outline cannot be calculated. The elements that make it impossible to program, so the drawing should fully represent the geometric elements that make up the outline of the part.

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