Compound machining is one of the most popular machining processes in the field of machining. It is an advanced manufacturing technology. Compound machining is to realize several different machining processes on one machine tool. Compound machining is the most widely used and difficult, which is turn milling compound machining. Turn milling compound machining center is equivalent to the compound of a CNC lathe and a machining center.

At present, most turn milling compound machining is completed on the turning center, while the general turning center only changes the ordinary turret tool rest of the NC lathe into the turret tool rest with power tools, and the spindle increases the function of c-axis. Due to the limitations of turret tool holder structure and overall dimension, the power of power head is small, the speed is not high, and large tools cannot be installed. Such a turning center is mainly turning, and the functions of milling and drilling are only auxiliary machining. The cost of power tool holder is expensive, resulting in the high cost of turning center. The selling price is generally more than 800000 yuan, which can not be borne by ordinary users. Most economical turn milling composites are XZC axis, that is, a rotating C axis is added to the chuck to realize the basic milling function.

At present, there are many kinds of equipment in the upper milling compound machining center on the market, including WFL, DMG, Dalian machine tool, Doosan (Doosan machine tool) and such high-end equipment;

At present, the well-known software on the market includes Edgecam, UG NX and so on.

Compared with the conventional NC machining process, the outstanding advantages of compound machining are mainly reflected in the following aspects.

(1) Shorten the product manufacturing process chain and improve production efficiency. Turn milling compound processing can realize one-time card loading to complete all or most of the processing procedures, so as to greatly shorten the product manufacturing process chain. In this way, on the one hand, the production auxiliary time caused by the change of clamping is reduced, and at the same time, the manufacturing cycle and waiting time of tooling and fixtures are reduced, which can significantly improve the production efficiency.

(2) Reduce clamping times and improve machining accuracy. The reduction of card loading times avoids the error accumulation caused by the transformation of positioning reference. At the same time, most of the current turn milling compound processing equipment have the function of on-line detection, which can realize the in-situ detection and accuracy control of key data in the manufacturing process, so as to improve the processing accuracy of products.

(3) Reduce the floor area and reduce the production cost. Although the single price of turn milling composite processing equipment is relatively high, due to the shortening of manufacturing process chain, the reduction of equipment required for products, as well as the reduction of the number of tooling and fixtures, workshop floor area and equipment maintenance costs, it can effectively reduce the investment, production operation and management cost of overall fixed assets.