1. Continue to expand the compound processing capability of a single CNC machine tool. Through the optimization of technological processes and procedures (such as merging, simplifying the machining process), the improvement of tool structure (such as the use of combined tools, special tools, etc.) to reduce the number of processes, procedures and required tools; Such as multi-axis control spindle head, multi-tool position turret-type tool rest and grinding wheel head rest, etc.), increase the flexibility of the machine tool, the tool reserve and the ability to automatically provide (replace) tools, thereby improving the composite machining of machine tools. The ability to make more parts, more processes and processes can be completed on a machine tool in one clamping and later processing. For example, now there are not only various single-process multi-process composite machining machines, such as turning centers, milling centers, grinding centers, stamping machining centers, etc., but also turning-milling, turning-grinding, turning-gear making The emergence and development of multi-process composite machining machine tools of composite and even cutting and laser processing composite, stamping and drilling composite processes. Japan's MAZAK company has recently launched Integrex-IIIst and Integrex-IV st series of double-spindle five-linkage turning-milling compound machining machine tools, in addition to turning and milling functions, it also has crankshaft machining, gear hobbing, internal and external cylindrical grinding and laser quenching and other processing functions.
2. In order to further improve productivity, especially the output rate of a single compound machining machine, CNC compound machining machine tools are developing in the direction of multi-spindle, multi-tool holder, and multi-station. For example, Chiron's new products DZ15KW, DZ18W, DZ12KS on EMO-2005 are all double-spindle machining centers; MAKINO's TWINFLEX MD is a double-horizontal or double-spindle machining center, and each has a tool-changing manipulator; MAZAK's TWINFLEX MD Integrex 300IV and MC726/MT of German STAMA are three-spindle turning-milling compound machining machines with two turning spindles and one milling spindle; V160D of German INDEX Company is an inverted CNC lathe with double spindles and double turrets, which can Two identical parts are processed at the same time; Super NTY3 of Japan NAKAMURA-TOME Company is a double-spindle, three-turret turning-milling machining center, Germany TRAUB Company's TNX80/65 is a double-spindle four-turret turning-milling center Milling Center, etc. The reason why these machine tools adopt the structure of multi-spindle and multi-tool rest is not only partly due to the needs of processing technology and procedures, but also because of the use of multi-spindle to process multiple identical parts at the same time and multi-tool rests to simultaneously process the same part. The parts are processed in multiple processes, which can overlap each other in terms of processing time, thereby multiplying the output per unit time of the composite processing machine tool. Because these multi-spindle, multi-turret machine tools are essentially equivalent to the combination of two or more identical CNC composite machining machines, but only use a common bed and are controlled by the same CNC system. However, the cost of such a multi-spindle multi-turret machine tool is cheaper than the total cost of multiple independent single-spindle machine tools, so it is still economically cost-effective.