Nc programming technology for turning and milling compound machine tool

The development of machining technology of turn-milling compound machine tool has also put forward higher requirements for NC programming technology, which is also a bottleneck in the practical production and application of turn-milling compound machine tool. Compared with the traditional NUMERICAL control programming technology, the programming difficulties of turning and milling compound machining machine tools are mainly reflected in the following aspects.
(1) Complex process types. For the process personnel, not only to be able to master CNC turning, multi-axis milling, drilling and other processing methods of programming, but also for the connection between the process and the way to accurately define the knife. Therefore, in nc programming, it is necessary to have an intuitive understanding of the process model and the distribution of machining allowance after the completion of the current process, so as to facilitate the programming of the next process and the setting of the back and forth knife.

(2) the serial parallel sequence in the process of programming must be determined in strict accordance with the process route. Many parts can be completely processed from raw material to finished product when they are processed on the turn-milling complex machining center, so the results of the processing program must be consistent with the process route. At the same time, for multi - channel parallel machining also need to be considered in the process of NC machining programming. Therefore, in order to realize the high efficiency of composite machining, we should develop the process solution of process - programming - simulation integration.

(3) Some functions of turning and milling compound machining machine tools are not supported by the current general CAM software. Compared with conventional single machine machining, the machine tool movement and machining functions of turning and milling composite machining are much more complex, and 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, the program compiled by using general CAM software still needs a lot of manual or interactive ways to be applied to automatic turn-milling complex machining.

(4) Integration of processing procedures. At present, the NC programs of general CAM software are independent of each other. In order to realize the automation and complete machining of turning and milling complex, it is necessary to integrate and integrate these independent machining programs. This integration must be guided by the process route of parts, first determine which programs are parallel, and then determine the processing sequence of different process methods, and give accurate tool change, card replacement, datum transformation and tool advance and retreat instructions.

It can be seen that it is very difficult to make nc program for turning milling machine tool, and there are still many defects and deficiencies in the current general CAM software for turning milling machine tool. In order to make up for these deficiencies, it is a more realistic solution to develop a special programming system suitable for product process and composite processing equipment on the basis of existing general CAD/CAM software. On the one hand, it can reduce the repeated investment of software purchase, and at the same time, it can avoid the defects of process knowledge reuse and complex personnel allocation caused by the disunity of programming platform.


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