Overview of the structure and selection of CNC milling machine
The structure and selection of CNC milling machine, is the main content of this article will be introduced, is also one of its basic content, so we should master it, in order to better use CNC milling machine.
1. Structure of the CNC milling machine
CNC milling machine is generally composed of CNC system, main transmission system, feed servo system, cooling lubrication system and other major systems.
(1) Spindle box
Mainly includes the spindle box and spindle drive system, is used to install the clip tool, and can drive the tool rotation.
(2) Spindle components
It is one of the important components of the CNC milling machine. Its precision, vibration resistance and thermal deformation parameters will affect the processing quality of the milling machine. The main shaft is generally a empty shaft, the front end is the cone hole, the back end is equipped with the tool automatic clamping mechanism, mainly for the tool clamping. In high-speed situations, the circulating lubrication system is generally used.
(3) Feed to the servo system
Composed of the feed motor and the feed actuator, the relative movement between the tool and the workpiece is realized according to the set feed speed, including linear feed movement and rotational motion.
(4) Control system
It is the center of the CNC milling machine motion control, mainly to execute the CNC machining program, so as to control the milling machine for processing.
(5) Auxiliary device
Including hydraulic, pneumatic, lubrication, cooling system and chip exhaust, protection and other devices.
(6) Machine tool base parts
Usually refers to the machine tool base, column, beam, etc., it is the foundation and frame of the whole machine tool.
2. Selection of CNC milling machine
(1) Size
The smaller CNC milling machine is suitable for machining small parts and contour milling of complex parts, and the larger CNC milling machine is suitable for machining large complex parts.
(2) Precision requirements
Now the accuracy standard of CNC milling machine has been formulated, as: the positioning accuracy of the linear motion coordinate is 0.04 / 300mm, the repeated positioning accuracy is 0.025mm, and the milling circle accuracy is 0.035mm.
(3) Processing characteristics
According to the different processing parts, we can choose different CNC milling machines, but also according to the processing requirements of the parts, in the general CNC milling machine to add some devices, so as to meet the processing requirements.
