Machining center is a new type of processing equipment with strong processing performance and high precision and efficiency. Its birth is due to the continuous upgrading and development of CNC technology in recent years and the high processing needs of the processing and manufacturing industry. The biggest feature of the machining center is that according to the requirements of the processing technology on the part drawings, the preparation of reasonable processing procedures and the selection of suitable processing tools can complete unattended automated complex processing. But unlike traditional machine tools, milling machines save a lot of labor costs. So is there still room for improvement in the machining accuracy and machining efficiency of the machining center, and can it continue to be improved? The answer is: yes.

Industry data shows that the actual cutting time of the machining center only accounts for 55% of the overall operating time, and there are many factors that affect the machining efficiency of the machining center. In fact, compared with imported high-end machining centers, the difference in spindle speed of the machining centers we use every day is not large. That is to say, the difference in hardware configuration is not the core factor affecting the accuracy and efficiency of the machining center. The low efficiency of the machining center should also be found in terms of programming, tools, processing routes, and selection of cutting amounts.

Pay attention to programming skills

Programming is the most basic and priority work of machining workpieces in machining centers. The pros and cons of programming directly affect the final machining accuracy and machining efficiency of the machining center. The main program and subprograms are used skillfully, and the subprograms are repeatedly called in the main program until the processing is completed. It can not only ensure the consistency of processing dimensions but also improve its processing efficiency. In addition, reducing the cumulative error of the CNC system can ensure machining accuracy.

Tool selection and correct installation

Whether it is CNC machining or ordinary machining, the tool is the most important factor in determining the machining accuracy and surface quality of the workpiece because it directly acts on the workpiece. Especially when the workpiece is processed in the machining center, the tools are stored in the tool magazine in advance and cannot be replaced at will once the processing starts. Therefore, the general principle of tool selection is: easy installation and adjustment, good rigidity, high durability and high precision. Select the material tool with good performance, such as good wear resistance and heat resistance, with coating technology. Select high-precision inserts to meet the different requirements of high-speed, high-strength cutting technology.

Reasonable processing route

We will find that processing the same workpiece, the processing efficiency will be different. The difference here is mainly reflected in the selection of the processing route. The processing route and processing sequence are the basis for optimizing the processing efficiency of the workpiece. Specifically, it is necessary to select the appropriate feed method according to the technological requirements of the workpiece to ensure the cutting accuracy and processing efficiency of the workpiece. When milling the outer contour of a plane workpiece, the cut-in and cut-out routes of the tool should be arranged. Try to cut in and out along the extension line of the contour curve to avoid knife marks at the junction. At the same time, in the milling process, down milling or up milling should be selected according to the condition of the workpiece. In addition, in the environment of multi-axis linkage processing, the processing route should be shortened as much as possible, and the time of idle movement of the tool should be reduced. Simple and accurate are the key points of a reasonable processing route.

Reasonable choice of cutting the amount

The cutting amount is an important parameter of the main motion and feed motion of the machining center, and has an important influence on the machining accuracy, machining efficiency, and tool wear of the workpiece. The basic principle of cutting amount selection is: under the condition of rigidity, a larger depth of cut is used for roughing to reduce the number of passes and improve the productivity of the workpiece; generally, a smaller depth of cut is used for finishing to obtain higher surface quality.

Affecting the final machining accuracy and machining efficiency of the workpiece, in addition to the difference in the configuration of the machining center, the setting of the machining route, the selection and correct installation of the tool, the reasonable selection of the cutting amount, and the programming skills are all important factors that can determine the accuracy and efficiency of the machining center. factor, and it does not need to consume too much processing cost.

Conclusion

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