Compound machine meaning refers to a single machine to achieve multiple elements or completed as soon as possible from the blank to the finished product processing. According to the structural characteristics can be divided into composite-type compound and process categories. Composite-type boring and milling machine tools such as drill composite-machining centers, milling complex – turning centers, milling boring and drilling-composite-composite machining center; operations compound machine tools such as multi-axis machining of complex machines and dual-spindle turning Center. Compound machine tools for processing, reduces the loading and unloading of the workpiece, replace and adjust the tool time and errors generated in the process, improves the precision of machining, shortening the product manufacturing cycle, improve production efficiency and the manufacturer's market reaction, relative to the traditional process of decentralized production method has a distinct advantage.
Processing of compound also causes the machine to a modular, multiple axis of development. Germany Index for turning machining center is the company's new modular structure, this machining centre to finish turning, milling, drilling, hobbing, grinding, laser heat treatment and other processes through the processing of complex parts. With the improvement of modern machining requirements, a large number of multi-axis NC machine tools more and more major companies welcomed. In 2005 China International machine tool show (CIMT2005), domestic and foreign manufacturers exhibited a variety of multi-axis machines (including dual spindle, dual turret, 9-axis control) as well as achieving 4~5-axis high-speed five-axis gantry machining centers, five-axis high speed milling Centre.