(2) Regular maintenance of the ball screw thread pair, adjust the axial clearance of the screw thread pair to ensure the reverse transmission accuracy and axial rigidity; regularly check whether the connection between the screw and the bed is loose; the screw guard If it is damaged, replace it in time to prevent dust or chips from entering.

(3) Maintenance of the tool magazine and tool change robot It is strictly forbidden to load the overweight and long tool into the tool magazine to avoid the collision of the tool or the workpiece and the fixture when the robot is changing the tool; often check whether the zero return position of the tool magazine is Correctly check whether the position of the machine tool spindle return point is in place and adjust it in time; when starting up, the tool magazine and the robot should be run empty to check whether the work of each part is normal, especially whether the stroke switch and solenoid valve can operate normally; Whether the tool is locked on the robot is reliable, and it should be handled in time if it is not normal.

3.3 Hydraulic and pneumatic system maintenance Regularly clean or replace the filters or filter screens of various lubrication, hydraulic and pneumatic systems; regularly perform oil quality test on the hydraulic system, add and replace hydraulic oil; regularly filter the air pressure system. The gas is discharged.

3.4 Maintenance of machine tool accuracy Regularly check and correct the machine level and mechanical accuracy. There are two types of mechanical accuracy correction methods: soft and hard. The soft method is mainly through system parameter compensation, such as screw backlash compensation, fixed positioning compensation of each coordinate positioning, machine tool reference point position correction, etc.; hard method is generally carried out during machine overhaul, such as rail scraping, ball rolling The screw nut pair is pre-tightened to adjust the backlash and the like.

4 Conclusion

CNC equipment is an advanced processing equipment with high degree of automation and complicated structure. To fully utilize the efficiency of numerical control equipment, it must be operated correctly and carefully maintained to ensure the normal operation and high utilization rate of the equipment. It is a combination of machine, electricity and liquid. Therefore, the numerical control equipment has higher requirements for maintenance and maintenance personnel. In addition to the routine maintenance mentioned in this article, it should also be specifically maintained and maintained according to the detailed operation manual of the specific numerical control equipment.

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