Precision parts processing possibilities and convenience

Precision parts processing technology reflected in what aspects? The processing technology of precision parts involves a wide range, which is analyzed only from the two aspects of processing possibility and convenience. It is mainly the dimensional data on the machining drawings of parts should conform to the principle of convenient programming

(1) The dimensioning method on the parts drawing should adapt to the characteristics of CNC machining. On the precision parts machining drawing, the dimensions should be quoted with the same reference or the coordinate dimensions should be directly given.

1. This labeling method is not only convenient for programming, but also convenient for the mutual coordination between sizes, which brings great convenience in maintaining the consistency of design reference, process reference, test reference and programming origin setting.

2. Because parts designers generally consider assembly and other usage characteristics more in dimension labeling, they have to use local scattered labeling method, which will bring a lot of inconvenience to process arrangement and numerical control machining.

3. Due to the high machining accuracy and repeated positioning accuracy of precision parts, the service characteristics will not be damaged due to large accumulated errors, so the local scattered labeling method can be changed to the same reference size or directly give the coordinate size labeling method.

(2) Base points or node coordinates should be calculated during manual programming. In automatic programming, precision parts machining must define all the geometric elements that make up the contour of the part. Therefore, when analyzing the parts drawing, it is necessary to analyze whether the given conditions of geometric elements are sufficient.

For example, the arc and the line, the arc and the arc are tangent on the drawing, but according to the dimension given on the drawing, when calculating the tangent condition, it becomes the intersection or the phase separation state. Because of the inadequacy of geometrical elements of precision parts, it is impossible to start programming. In this case, consult with the parts designer.