1. Economical CNC machine tools are classified according to their performance; Mid-range CNC machine tools; CNC machine tools;
2. Classification of metal cutting CNC machine tools according to process use, including CNC lathes, CNC drilling machines, CNC milling machines, CNC grinding machines, CNC boring machines and machining centers. These machine tools are suitable for single piece, small batch and multi-variety and part processing, have good consistency of processing size, high productivity and automation degree, and high equipment flexibility. Metal forming CNC machine tools; such machine tools include CNC bending machines, CNC combined punches, CNC pipe bending machines, CNC rotary head presses, etc. CNC special processing machine tools; such machine tools include CNC wire (electrode) cutting machine tools, CNC electric discharge machining machines, CNC flame cutting machines, CNC laser cutting machines, and special combination machine tools. Other types of NC equipment; non-machining equipment uses NC technology, such as automatic assembly machines, multi-coordinate measuring machines, automatic plotters, and industrial robots.
3. The point control is classified according to the movement mode. The characteristic of the point control NC machine tool is that the moving parts of the machine tool can only realize the movement from one position to another position. No machining process is performed during the movement and positioning process. Such as NC drilling machine, digit boring machine, NC welding machine and NC pipe bending machine. Linear control; point linear control is characterized in that the moving parts of the machine tool must not only realize the movement and positioning of one coordinate position to another position, but also can achieve linear feed movement parallel to the coordinate axis or control two coordinate axes to achieve slant Feed movement. Contour control; The characteristic of contour control NC machine tools is that the moving parts of the machine tool can achieve simultaneous control of two coordinate axes. It not only needs to control the start and end coordinates of the moving parts of the machine tool, but also the speed and displacement of each point in the entire machining process, that is, the movement trajectory is controlled to process the part into a straight line, a curve in the plane or a curved surface in space. .
4. Classified open-loop control according to control mode; that is, control mode without position feedback device. Semi-closed-loop control; refers to the angular displacement detection device installed on the open-loop control servo motor shaft, which indirectly detects the displacement of the moving parts by detecting the rotation angle of the servo motor and feeds it back to the comparator of the numerical control device, and compares it with the input command. The value controls the moving part. Closed-loop control; it is a direct linear or rotary detection device at the corresponding position of the moving parts at the end of the machine tool. The directly measured displacement or angular displacement value is fed back to the comparator of the numerical control device and compared with the input command displacement. The difference controls the moving parts so that the moving parts move strictly according to the actual amount of displacement required.