1. The processing technology content requirements are detailed

All process problems should be arranged in advance as much as possible and programmed into the processing program. The machining process not only includes the detailed cutting processing steps and the clamping scheme of the fixture used, but also includes the model, specification, cutting amount, other special requirements of the tool and the process diagram marked with the coordinate position of CNC machining. In addition, detailed machining parameters need to be determined in automatic programming.

2. The CNC machining process requires strict

The processing process must be considered comprehensively to avoid serious consequences. For example, when tapping the thread, the CNC machine does not know whether the hole is crowded with iron filings, and whether it is necessary to withdraw the tool to clean the iron filings and continue processing. In the case of reaching a situation, it is usually necessary to consider in advance in the process and take a series of process measures to solve it. Another example is that when ordinary machine tools are processed, they can be "tried to cut" many times to meet the accuracy requirements of parts: and CNC machine tool processing, in strict accordance with the provisions J4, J feed y requirements are difficult to be accurate. Therefore, the CNC machining process design requirements are more stringent.

3. To formulate the CNC machining process, it is necessary to carry out mathematical processing of part graphics and calculate the programmed size setting value

The programming dimension is not the design size on the part drawing, and it needs to be mathematically processed and calculated on the part drawing. At this time, the programmed size setting value should be readjusted and calculated according to the part ruler ten tolerance requirements and the shape geometric relationship of the part to determine the programming size.

4. Consider the influence of feed speed on the shape accuracy of parts

When selecting the amount of cutting, the influence of feed speed on the accuracy of the machined parts should be considered. In CNC machining, the movement trajectory of the tool is fully completed by the interpolation operation. According to the principle of interpolation, under the conditions set by the numerical control system, the faster the feed speed, the lower the interpolation accuracy, resulting in the worse the contour shape accuracy of the workpiece. Especially when it comes to high-precision machining, this effect is even more pronounced.

5. Analyze the importance of tool selection

The machining programming of complex surfaces usually adopts automatic programming with a central motion trajectory, so for 4i with tool compensation function, the programmed program can only be torn back and restarted.