CNC gantry milling machine is an automatic processing equipment developed on the basis of ordinary milling machine. The processing technology of the two machines is basically the same, and the structure is also somewhat similar. CNC gantry milling machines can be divided into two categories: toolless magazine and tool magazine. Among them, the CNC gantry milling machine with tool magazine is also called the CNC gantry machining center.

In addition to the characteristics of ordinary milling machines, CNC gantry milling machines also have the following characteristics:

1. The adaptability and flexibility of parts processing are strong, and parts with particularly complex contours or difficult size control can be processed, such as mold parts, shell parts, etc.;

2. It can process parts that ordinary machine tools cannot or are difficult to process, such as complex curved parts and three-dimensional surface parts described by mathematical models;

3. Parts that require multi-process processing can be processed in one clamping positioning;

4. High processing accuracy, stable and reliable processing quality. The pulse equivalent of the CNC device is generally 0.001mm, and the high-precision CNC system can reach 0.1m m, and the CNC machining also avoids the operator's operation errors;

5. The degree of production automation is high, which can reduce the labor intensity of operators. Facilitate the automation of production management;

6. High production efficiency. Generally, CNC gantry milling machines do not need to use special process equipment such as special fixtures. When changing workpieces, only the machining program, clamping tool and tool adjustment data stored in the CNC device need to be called, which greatly shortens the production cycle. Secondly, the CNC gantry milling machine has the functions of milling machine, boring machine and drilling machine, which makes the process highly concentrated and greatly improves production efficiency. In addition, the spindle speed and feed speed of the CNC gantry milling machine are stepless, so it is conducive to the selection of cutting parameters.

The accuracy selection of CNC gantry milling machine considers all aspects, including geometric accuracy, positioning accuracy, interpolation accuracy, etc. The higher the stiffness of the gantry milling machine, the better the accuracy stability of the machine tool. The table is a hydrostatic guide, driven by a hydrostatic worm and a worm with a wear-resistant coating, and the movement is smooth. These two advantages are conducive to ensuring the machining accuracy of large guide rails. Machining accuracy includes machine tool accuracy, machine tool stiffness, machining technology, tools and measuring tools. Considering the accuracy of the machine tool, it is also necessary to analyze its accuracy retention, which is closely related to the stiffness of the machine tool, the stress treatment level of the structural parts, and the mechanical properties of the guide rail and transmission parts.

The main purpose of improving the main motion speed and feed speed of CNC gantry milling machine is to improve the processing efficiency and surface roughness. For light metal materials such as aluminum and aluminum alloys, high-speed machining is necessary. High-speed cutting has the advantages of large cutting amount, small thermal deformation, low roughness and small cutting force, especially suitable for machining thin-walled and complex curved workpieces. High-performance machines tend to be more expensive. Machine tool manufacturers should assist users to choose cost-effective products according to actual process needs. Gantry milling machine has simple structure, good rigidity, easy to use, easy to maintain, can meet the needs of a variety of process fields, the price is only 30%-50% of the same specification CNC gantry boring and milling machine, with a good cost performance.