1、 Classified by the control trajectory of machine tool movement:
⑴ CNC machine tools with point control
⑵ Linear control CNC machine tool
(3) Contour controlled CNC machine tools can be divided into the following forms:
① Two axis linkage: mainly used for CNC lathes to process rotating surfaces or CNC milling machines to process curved cylindrical surfaces.
② Two axis and half linkage: mainly used for the control of machine tools with three or more axes, where two axes can be linked, while the other axis can perform periodic feed.
③ Three axis linkage: It is generally divided into two types. One type is the linkage of the X/Y/Z three linear coordinate axes, which are commonly used in CNC milling machines, machining centers, etc. The other type is to control not only the two linear coordinates in X/Y/Z, but also the rotation coordinate axis that rotates around one of the linear coordinate axes.
④ Four axis linkage: Simultaneously control the linkage between the X/Y/Z three linear coordinate axes and a certain rotational coordinate axis.
⑤ Five axis linkage: In addition to simultaneously controlling the X/Y/Z coordinate axes, it also controls the two coordinate axes A, B, and C rotating around these linear coordinate axes, forming a simultaneous control of the five axis linkage. At this time, the tool can be positioned in any direction in space
2、 Classified by servo control method:
1. Open loop control CNC machine tool
2. Closed loop control machine tools are divided into two control methods: full closed-loop and semi closed-loop.
① Full closed-loop control
② Semi closed-loop control
3、 Hybrid control CNC machine tools:
1. Metal cutting refers to CNC machine tools that use various cutting processes such as turning, milling, collision, reaming, drilling, grinding, and planing. It can be further divided into the following two categories.
① Ordinary CNC machine tools such as CNC lathes, CNC milling machines, CNC grinding machines, etc.
② The main feature of the machining center is a tool library with an automatic tool changing mechanism, and the workpiece is processed once. After clamping, various cutting tools are automatically replaced, and multiple processes such as milling (turning) keys, reaming, drilling, and threading are continuously carried out on each machining surface of the workpiece on the same machine tool, such as (building/milling) machining centers, turning centers, and drilling centers.
2. Metal forming class
3. Special processing
4. Measurement and drawing classes
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