Large five-axis CNC planer milling machine is widely used in the field of machining, however, in most cases, people only pay attention to the use of various functions, but ignore the scientific maintenance, which undoubtedly poses a potential threat to the normal operation of the equipment. The following Kunshan Duyang CNC to share with you how to carry out the daily maintenance of large five-axis CNC gantry milling machine. 1. Maintenance of spindle parts Since most large five-axis planer milling machines use speed regulating motors, their headstock structure is very simple. In the control, the most likely fault parts are the intelligent speed regulation configuration of the tool and the automatic tightening structure of the spindle. In order to ensure that there is no automatic loosening during power failure or operation, an automatic clamping mechanism of the spring clamping tool is required, and a travel switch is set on the milling machine. If the blade cannot be automatically loosened after clamping, the pressure of the spiral spring nut, the stroke switch or the loose cutter barrel can be adjusted to a certain extent to make it adapt to the reduction of the spring closure. Secondly, attention should be paid to the noise of the headstock and the heating of the spindle. It is necessary to clean the headstock regularly and add appropriate lubricants to ensure the lubrication of the spindle. In addition, it is also necessary to pay attention to the friction and cleaning work between the spindle and the headstock. 2. Feed transmission chain maintenance In the feed transmission system, plastic guide rail, static guide rail, rolling guide rail, static nut pair and ball screw pair are generally used. Therefore, when the feed chain fails, its main external performance is that the quality of motion is greatly reduced. For example, the internal mechanical parts do not move to the corresponding parts, creep, interrupt operation, widen the reverse clearance, reduce positioning accuracy, and increase bearing noise. In response to such faults, the following measures can be taken: (1) Improve the transmission accuracy. Scientifically adjust the preload force of each gear movement, and properly regulate the loose parts to completely eliminate the gap in the transmission and reduce the correlation value of the transmission chain. Multiple gear reducers can also be installed on the drive chain. (2) Improve the transmission stiffness. If the internal stiffness of the facility is not sufficient, it is necessary to properly adjust the preload between the support member and the nut pair, and select the appropriate screws, which will have a certain impact on the vibration and crawling of the slide frame and the workbench. There may also be reverse dead zones in the transmission chain, which will directly affect the accuracy of the transmission. 3. Automatic knife changing device If the tool is not clamped, the spring must be clamped during storage, assembly and repair of the spring. If the coupling between the worm shaft and the motor shaft is loose or the mechanical connection is tight, the cutter house will not be able to rotate normally, so the screws on the coupling must be tightened in time. If the movement of the tool library is not standardized and cannot reach the specified position, it can be attributed to the motor transmission error or rotation error. If you cannot clamp the tool through the tool sleeve, scientifically adjust the screws on the tool sleeve and tighten the spring to tighten the clamping pin. If the knife sleeve is not fully in place, check the position of the fork or adjust the limit switch.