CNC programming technology for turning and milling combined processing

The development of turn-milling composite processing technology has also put forward higher requirements for CNC programming technology, which is also a bottleneck that restricts the actual production application of turn-milling composite processing equipment. Since the turn-milling composite machining has been put into actual production for a short time, in the absence of a professional composite machining solution, general CAM software is usually used to plan part of the machining program, and then the craftsman manually integrates the program to meet the requirements. Requirements for processing procedures of compound processing machine tools. This solution places very high demands on craftsmen. Compared with traditional CNC programming technology, the programming difficulties of turning-milling composite processing are mainly reflected in the following aspects.

(1) There are many types of processes. For craftsmen, not only must they be able to master the programming methods of various processing methods such as CNC turning, multi-axis milling, drilling, etc., but also the connection between processes and the way of advancing and retracting the tool need to be accurately defined. Therefore, when performing CNC programming, it is necessary to have an intuitive understanding of the process model and the distribution of machining allowance after the current process is completed, so as to facilitate the programming of the next process and the setting of the advance and retreat tools.

(2) The serial and parallel sequence in the programming process must be determined strictly in accordance with the process route. When many parts are processed on a turning-milling compound machining center, complete processing from raw materials to finished products can be achieved, so the results of the processing program must be consistent with the process route. At the same time, multi-channel parallel processing also needs to be comprehensively considered during the preparation of CNC machining programs. It can be seen that in order to achieve efficient composite processing, an integrated process solution of process-programming-simulation should be developed.

(3) For some functions of turning and milling compound processing, the current general CAM software does not yet support it. Compared with conventional single-equipment processing, the machine tool movement and processing functions of turning and milling combined processing are much more complex. The current general CAM software is not enough to fully support the programming of these advanced functions, such as online measurement, sawing, automatic Feeding, tailstock control, etc. Therefore, programs compiled using general CAM software still require a large amount of manual or interactive methods to be applied to automated turning and milling composite processing.

(4) Integration of processing procedures. At present, the NC programs compiled by general CAM software are independent of each other. To achieve complex automated complete processing such as turning and milling, these independent processing programs need to be integrated and integrated. This integration must be guided by the process route of the part. First, determine which programs are parallel, and then determine the processing sequence of different process methods, and give accurate instructions for tool change, card installation and replacement, datum conversion, and tool advance and retreat. wait.

It can be seen that it is very difficult to program CNC programs for turning and milling combined processing, and the current general CAM software still has many defects and shortcomings for turning and milling combined processing. In order to make up for these shortcomings, it is a more realistic solution to develop a dedicated programming system suitable for product technology and composite processing equipment based on existing general CAD/CAM software. On the one hand, this reduces repeated investment in software acquisition, and at the same time, it also avoids defects such as the inability to reuse process knowledge and complex staffing due to inconsistent programming platforms.

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