Although compound processing has the advantages that traditional single processing can't match, in fact, the utilization rate of turning-milling compound machine tool processing has not been fully utilized in the field of aviation manufacturing. The key reason is that the application time of turning and milling in the aerospace manufacturing field is relatively short. Turning and milling machine tool processing technology, CNC programming technology, post-processing technology and simulation technology suitable for the structure and process characteristics of aerospace parts are still in the exploratory stage. In order to give full play to the efficiency of turning and milling machine tool processing equipment, and to improve the processing efficiency and accuracy of products, it is necessary to comprehensively solve and solve the above-mentioned key foundations to achieve comprehensive applications.
1. The processing technology of the turning and milling machine is different from the traditional processing equipment. The turning and milling machine machining center is actually equivalent to a production line. How to formulate a reasonable process route, fixation method, and select a reasonable tool according to the process characteristics of parts and turning-milling machine tools is the key to achieving high-efficiency and high-precision machining.
Process concentration is the most significant feature of compound processing. Therefore, a scientific and reasonable process route is the key to improving the machining efficiency and accuracy of the turning and milling machine. For example, Swiss Baomei's S192F milling and turning compound machining center has five-axis milling, turning, boring, drilling, sawing, and automatic feeding functions. This machine adopts FANUC 31I numerical control system, which has the functions of tool vector smoothing, super predictability, high-speed interpolation and so on. Especially suitable for high-speed precision machining of shaft and rotary parts. In the processing of aviation impellers, machining centers have outstanding advantages. When a bar is used as the impeller blank, the traditional impeller processing technology first uses a CNC lathe to process the outer contour of the impeller, and then completes the turning benchmark; on this basis, a five-axis CNC machining center is used to slot and rough the profile and the hub , Semi-finishing and finishing; final hole processing. It is carried out on a five-axis machining center or drilling equipment. The S192F milling center can not only complete all the processing of the above processes at one time, but also realize batch processing of impellers through sawing and automatic feeding when using bar materials. The whole process can be completed automatically without manual intervention. The process route can be set in the following way: the main shaft clamping rod material rough turning impeller contour fine turning contour five-axis milling groove runner rough turning runner semi-fine drilling, and the spindle clamping turning impeller bottom surface drilling. It can be seen that the entire impeller processing process can be completed in one load, which greatly improves the processing efficiency and accuracy.
Double tool holder turning and milling machining center, the double turret equipment has a dual channel control system, the upper and lower tool holders can be controlled separately, and the synchronization processing can be realized through the synchronization statement in the code. In order to give full play to the processing capacity of the equipment, the simultaneous processing of parts can be realized through the simultaneous operation of the double tool holders under the allowable processing conditions. Through the synchronous setting of the upper and lower tool rests, the rough drilling of the inner hole can be completed at the same time as the rough turning shape, which further improves the processing efficiency. Through the synchronous movement of the upper and lower tool holders, a series of holes are processed, which not only improves the processing efficiency, but also reduces the influence of workpiece deformation by offsetting the axial force of the holes. In order to realize this function, it is necessary to conduct a systematic and in-depth study of the process plan in the early stage of process design, determine the serial and parallel sequence of the process route, and realize the above function through a reasonable process flow combination.