CNC programming is the most fundamental task in CNC machining. The quality of the workpiece machining program directly affects the final machining accuracy and efficiency of the machine tool. We can start by skillfully using inherent programs, reducing the cumulative error of the CNC system, and flexibly applying main programs and subprograms.
1. Flexible use of main programs and subprograms
In the processing of complex molds, it is generally adopted to use the form of multiple parts per mold. If there are several identical shapes on the mold, the relationship between the main program and subprograms should be flexibly utilized. The subprograms should be repeatedly called in the main program until the processing is completed. This not only ensures the consistency of the processing dimensions but also improves the processing efficiency.
2. Reduce the cumulative error of the numerical control system
Generally, incremental programming is used for machining workpieces, which is based on previous points for processing. Executing multiple program segments in succession will inevitably produce certain cumulative errors. Therefore, when programming, it is advisable to use absolute programming, so that each program segment is based on the workpiece origin. This can reduce the cumulative errors of the CNC system and ensure machining accuracy.
Machining accuracy is primarily used to describe the degree of product production. Both machining accuracy and machining error are terms used to evaluate the geometric parameters of the machined surface. However, the actual parameters obtained by any machining method are never absolutely accurate. From the perspective of the function of the part, as long as the machining error is within the tolerance range required by the part drawing, it is considered that the machining accuracy is ensured.