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Post-processing technology for turning and milling combined processing

Corresponding to CNC programming technology, turning and milling combined processing puts forward higher requirements for current post-processing software and technology due to complex process methods and many moving parts. Compared with conventional CNC equipment, its post-processing difficulties are mainly reflected in the following aspects.

(1) The connection movement between different processes requires strict accuracy. Due to the wide variety of processing techniques performed on turn-milling composite equipment, automatic switching of processing methods, tools, and moving parts must be completed promptly and accurately after the current process is completed to ensure the correctness and safety of the processing process. In order to achieve this goal, on the one hand, it is required to set up a reasonable way of advancing and retracting the tool, as well as the timing of automatic tool change and coolant start and stop. In addition, more importantly, it is necessary to set the position of other non-moving parts when processing the current process. . In this way, collisions between moving parts and non-moving parts of the machine tool can be avoided during tool change and processing, ensuring the safety and stability of the processing process.

(2) It is necessary to automatically determine the process sequence and CNC program. Since the process route in composite machining is relatively long, relying on manual labor to organize and integrate the post-completed NC code is not only inefficient but also prone to errors. The ideal solution is to be able to automatically determine the processing sequence and the process methods contained in the tool location files during post-processing, and to automatically maintain them in the NC code after the post-processing is completed. For this reason, the tool location file information after the CNC programming is completed not only needs to contain the corresponding process method and tool location information, but also needs to contain the corresponding processing sequence, type and number of the tool used, so that it can be processed during post-processing. Achieve automatic determination of process sequence, process method and tool.

(3) Post-processing technology for different processing methods. The post-processing program for turning and milling combined processing is not only required to be able to realize post-processing of multi-axis CNC milling, turning, and drilling, but also to be able to realize functions such as sawing, automatic feeding, tailstock control, and program cycle calling. The post-processing algorithm of milling composite machining basically covers the post-processing methods of all existing CNC machining processes, and it must also be able to achieve seamless integration and motion connection between different machining methods.

(4) Make full use of the advanced functions of the control system. The CNC systems currently used in turning and milling composite machining centers are all very advanced control systems, such as the FANUC31i system used by Baomei S192FT and the SINUMERIK840D system used by WFL150. Most of these advanced control systems have advanced functions such as automatic feed optimization, tool vector smoothing, super look-ahead, and high-speed and high-precision interpolation. Therefore, the functions of these advanced CNC systems must be reflected in the appropriate position in the processing code completed in the post-processing stage in order to fully utilize the performance of the turning-milling composite processing equipment.

(5) Processing and calling of non-cutting functions. In addition to cutting functions such as turning, milling, drilling, and boring, compound processing machine tools also have non-cutting functions required for transition between various processes, such as automatic feeding, unloading, spindle docking, tailstock control, etc. In post-processing, these functions need to be used as a common module for the program to call, and the order and timing of the calls need to be determined according to the process route. These functions are currently not available in post-processing software.

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