Machining centers with more than five axes belong to special special equipment, and they generally process certain types of workpieces in a targeted manner. Briefly introduce the principle of the existence of machine tools with more than five axes: Generally speaking, a five-axis five-linked machining center can realize all-round processing of all sides of the workpiece, but the surface of the workpiece clamped on the worktable cannot be processed, and it is somewhat special. The workpiece needs to be machined on this surface. What should I do at this time? Then you need to remove the workpiece from the clamping position, turn it over and re-clamp it. In order to ensure the accuracy of repeated clamping, an additional set of mechanical devices is needed to ensure this “positioning error of repeated clamping”. An extra set of mechanical devices will definitely add more motion axes. Generally, these extra axes are auxiliary axes and will not participate in cutting motion. Therefore, this type of machine tool with more than five axes is called “X-axis five-linkage machine tool” (X is greater than 5), for example, 7-axis 5 Linked machine tools, 9-axis 5-linked machine tools…, the actual key is the number of linked axes. Generally, the number of simultaneously linked axes exceeds 5, which is meaningless. This means that regardless of the number of motion axes of the machine tool, only 5 can be linked.
Take an example, such as a turning-milling composite machining center. Its workpiece clamping position is a three-jaw chuck of a lathe. The milling head can realize the linear movement of XYZ three axes. In addition, the milling head can also swing to realize the rotation movement in one direction. The lathe head can rotate to realize the rotation in the other direction. In this way, it is now a five-axis machine. Five linkage machine tools. Since it is a “turning and milling compound machining center”, it should be able to realize the function of a lathe, then add a turning tool head, the turning tool head can realize linear motion in 2 directions, then the equipment has 2 more axes At this time, the equipment should be called “7-axis 5-linkage turning-milling compound machining center”. It’s not over yet. Since the work piece is held in the form of a lathe chuck, the part where the work piece is held also needs to be processed. What should we do at this time? Then set another car chuck on the opposite side of the car chuck. Two face-to-face chucks with concentric rotation axes. The opposite car chuck clamps the machined part of the workpiece, and loosens the first car chuck. At the beginning, the part of the workpiece that is blessed can be processed again. In this way, one more car chuck, isn’t it another rotation axis? At the same time, the extra car chuck can do linear motion close to the previous car chuck, so there is another linear motion axis. At this time, the machine tool is It is called “9-axis 5-linkage turning-milling compound machining center”.
Please remember. 5-axis 5-linkage is the basic requirement for high-precision, omni-directional, and no dead-angle machining of workpieces. That is to say, no matter how complex your workpiece is, as long as it is a 5-axis 5-linkage machine tool, it will be able to process it. Other axes with more than 5 axes are auxiliary axes. The main purpose is to improve the processing efficiency and ensure the accuracy of the workpiece. It does not matter whether it can be linked or not. So the current multi-axis machine tool only needs 5-axis linkage.