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Possibility and convenience of CNC precision parts processing
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The wide application of CNC precision machining technology in China's manufacturing industry has made more and more precision machining workers pay more attention to it. However, due to the complexity of CNC machining technology, operators need to learn well in advance. Especially the analysis of the processing technology of precision parts, which involves a wide range, this article will analyze the possibility and convenience of CNC precision parts processing.One. The size data on the part drawing should be consistent with the principle of convenient programming.
1. The dimensioning method on the part drawing should be adapted to the characteristics of CNC machining
On the CNC machining part drawing, the same reference quote size or coordinate size is directly given. This marking method is very helpful for the convenience of programming, and at the same time, it is also helpful for the coordination between the sizes. In particular, it brings great convenience in maintaining the consistency of design basis, process basis, detection basis and programming origin setting.
Due to the fact that part designers generally take into account the use characteristics such as assembly during the dimensioning process, they have to adopt the local decentralized marking method, which brings many inconveniences to the process arrangement and CNC machining. Since CNC machining accuracy and repeated positioning accuracy are very high, it will not damage the usage characteristics due to large accumulated errors, so the local decentralized labeling method can be changed to the same reference index size or the labeling method that directly gives the coordinate size .
2. The conditions of the geometric elements constituting the part outline should be sufficient
During manual programming, the coordinates of the base point or node need to be calculated. During automatic programming, the geometric elements that form part contours must be defined. Therefore, in the analysis of the part drawing, it is necessary to analyze whether the conditions given by the geometric elements are sufficient.
For example, the arc and the arc are tangent on the pattern, but according to the dimensions given on the figure, when calculating the tangent conditions, they become intersected or separated. Due to the inadequate conditions of the geometric elements constituting the part, the programming cannot be started. This situation requires consultation with the part designer.
Second, the structure and manufacturability of each processing part of the part should meet the characteristics of CNC machining.
1. The internal cavity and shape of the parts are preferably of uniform geometric type and size. This can reduce the tool specifications and the number of tool changes, making programming easier and improving production efficiency.
2. The size of the inner groove fillet determines the size of the tool diameter, so the inner groove fillet radius should not be too small. The quality of the part's manufacturability is related to the height of the processed contour and the size of the transition arc radius.
3. When milling the bottom surface of the part, the radius of the corner of the groove bottom should not be too large.
4. It is best to adopt a unified standard positioning. In CNC machining, if there is no unified reference positioning, the repositioning of the workpiece will lead to the inconsistency of the contour position and size of the two surfaces after processing.
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