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What should be done for process analysis of CNC precision machining parts

2023-05-31
The widespread application of CNC precision machining technology in China's manufacturing industry has attracted increasing attention from precision machining practitioners. However, due to the complexity of CNC machining technology, operators need to learn in advance. Especially for the analysis of the machining process of CNC parts, which involves a wide range of aspects, this article will analyze the possibility and convenience of CNC precision machining from two aspects.
1、 The provision of dimensional data on the part drawing should comply with the principle of convenient programming.
1. The method of dimensioning on the part drawing should adapt to the characteristics of CNC machining. On the CNC machining part drawing, the same benchmark can be used to annotate dimensions or directly provide coordinate dimensions. This dimensioning method is very helpful for the convenience of programming and also helps to coordinate dimensions. Especially in maintaining consistency between design standards, process standards, testing standards, and programming origin settings, it brings great convenience. Due to the fact that part designers usually take into account assembly and other usage characteristics during the dimensioning process, they have to use the local scattered annotation method, which brings many inconveniences to process arrangement and CNC machining. Due to the high precision of CNC machining and repeated positioning, the usage characteristics will not be damaged due to the generation of large accumulated errors.
Therefore, the local scattered annotation method can be changed to the annotation method with the same benchmark or directly providing coordinate dimensions.
2. The conditions for forming the geometric elements of the part contour should be sufficient when manually programming, and it is necessary to calculate the coordinates of the base point or node. When automatic programming, it is necessary to define the geometric elements that make up the contour of the part. Therefore, when analyzing part drawings, it is necessary to analyze whether the conditions given by geometric elements are sufficient. For example, an arc and an arc are tangent on the drawing, but according to the dimensions given on the drawing, when calculating the tangent condition, they become intersecting or apart. Due to insufficient geometric element conditions that make up the part, programming cannot proceed, and this situation requires consultation with the part designer.
2、 The structural craftsmanship of each processing part of the part should comply with the characteristics of CNC machining.
1. It is best to use a unified geometric type and size for the internal cavity and appearance of the part. This can reduce tool specifications and tool changes, making programming convenient and improving production efficiency.
2. The size of the inner groove fillet determines the size of the tool diameter, therefore the inner groove fillet radius should not be too small. The craftsmanship of a part is related to the height of the processed contour and the size of the transition arc radius.
3. When milling the bottom plane of a part, the radius of the groove bottom fillet should not be too large.
4. It is best to use a unified standard positioning. In CNC machining, if there is no unified benchmark positioning, the reinstallation of the workpiece may lead to the disharmony of contour positions and dimensions on the two machined surfaces.
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