Precision parts are composed of multiple surfaces with different structures. Each surface of the part has different accuracy requirements, and each surface has corresponding accuracy requirements. Therefore, when performing CNC machining, in order to achieve the accuracy requirements of part design. We should follow certain principles of processing procedures.
1. The principle of first roughing and then fine; first rough processing the processing materials, and gong out of the product shape. Then, follow the steps of roughing → semi-finishing → finishing for each surface of the product, and gradually improve the surface accuracy and surface smoothness of the part.
2. The principle of processing the datum surface first; the part will be processed as the datum surface for finishing during machining, because the positioning datum is accurate, the workpiece clamping error is small. Therefore, when the part is processed, the datum plane will be processed first as a reference. Huiwen Zhizao is a machining factory with more than ten years of CNC machining experience. It has complete equipment, CNC CNC turning/milling/grinding/drilling/processing. Partners who have parts processing needs are welcome to call for quotation. If there are multiple datum planes, the machining is carried out according to the order of datum conversion and the principle of gradually improving the machining accuracy.
3. The principle of face first and then hole; for parts with large plane outline size, such as: body, box, bracket and other parts. The use of plane positioning is more stable and reliable, and can avoid processing errors, so the principle of processing the surface first and then processing the hole position is adopted.
4. The principle of first inside and then outside; mainly for precision copper sleeve parts, because the coaxiality between the outer circle and the inner hole of copper sleeve parts is relatively high, so the outer circle is used as the machining reference to process the inner hole, and then the inner hole is used as the processing standard. Machining datum Machining the outer circle. The coaxiality of the two can be highly guaranteed, and the clamping tool can also be simplified.
The principle of reducing tool changes; try to reduce the number of tool changes during the CNC machining process, and arrange the order of the use of tools before machining to avoid machining errors.