From the perspective of the development history of machine tool technology, this type of composite machine tool is not a new type of machine tool that has only been developed recently. In fact, the boring and milling machining center that appeared as early as the late 1950s is a multi-functional compound machine tool. This type of machine tool can realize a variety of different processing techniques such as milling, drilling, boring and tapping by changing tools. It is equipped with After adding the rotary indexing worktable and the swing spindle head that automatically converts vertically and horizontally, the five-sided comprehensive processing of box parts can be realized. The turning center that emerged after the boring and milling machining center is a typical compound machine tool. It can be seen that many current turning and milling centers and turning and grinding centers are actually developed on the basis of previous turning centers. Some are composite machine tools developed by combining the technical advantages of machining centers and turning centers. .