Overview of the structure and selection of CNC milling machines

The structure and selection of CNC milling machine is the main content that this article will introduce, and it is also one of its basic content, so we should master it in order to better use CNC milling machine. 1. The structure of the CNC milling machine The CNC milling machine is generally composed of several major systems such as the CNC system, the main drive system, the feed servo system, and the cooling and lubricating system. (1) The spindle box mainly includes the spindle box body and the spindle drive system, which is used to clamp the tool and drive the tool to rotate. (2) The spindle component is one of the important components of the CNC milling machine. Its accuracy, vibration resistance and thermal deformation will affect the processing quality of the milling machine. The main shaft is generally a hollow shaft, the front end is a tapered hole, and the rear end is equipped with an automatic tool clamping mechanism, which is mainly used for tool clamping. In high-speed occasions, a circulating lubrication system is generally used. (3) The feed servo system is composed of a feed motor and a feed actuator. According to the set feed speed, the relative movement between the tool and the workpiece can be realized, including linear feed movement and rotary movement. (4) The control system is the center of the motion control of the CNC milling machine, which mainly executes the CNC machining program to control the milling machine for processing. (5) Auxiliary devices include hydraulic, pneumatic, lubrication, cooling systems, chip removal and protection devices. (6) Machine tool basic parts usually refer to the base, column, beam, etc. of the machine tool, which is the foundation and frame of the entire machine tool. 2. Selection of CNC milling machines (1) Smaller size CNC milling machines are suitable for processing small and medium-sized parts and contour milling tasks of complex shapes; while larger size CNC milling machines are suitable for processing large-size complex parts. (2) Accuracy requirements The accuracy standards of CNC milling machines have now been formulated, as follows: the positioning accuracy of the linear motion coordinates is 0.04/300mm, the repeat positioning accuracy is 0.025mm, and the milling circle accuracy is 0.035mm. (3) Processing characteristics According to different processing parts, we can choose different CNC milling machines, or add some devices to the general CNC milling machine according to the parts processing requirements, so as to meet the processing requirements. (Picture/text http://www.wxdtc.com/)