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What is the daily maintenance of CNC?

Time:2023/5/20Posted:ShenZhen Pactoo Technology Co,.LTD
1、 Maintenance of CNC system

01. Strictly abide by the operating procedures and daily maintenance system

02. The doors of the numerical control cabinet and the strong current cabinet should be opened as little as possible. Generally, there will be oil mist, dust and even metal powder in the air of the machining workshop. Once they fall on the circuit board or electronic device in the numerical control system, it is easy to cause the insulation resistance between the components to decrease, and even lead to the damage of the components and the circuit board. Some users open the door of the numerical control cabinet to dissipate heat in summer in order to make the numerical control system work overload for a long time. This is a highly undesirable method, which eventually leads to accelerated damage of the numerical control system.

03. Regularly clean the cooling and ventilation system of the digital control cabinet, and check whether the cooling fans on the numerical control cabinet work normally. There are many ways to measure the quality of a CNC lathe processing machine tool, but the main requirements are good workmanship, high degree of serialization, generalization and standardization, simple structure, light weight, reliable work, and high productivity. Although the hardware and engineering machinery will not overheat last year, it will still maintain a relatively large growth trend in the next few years. Check whether the air duct filter is blocked every half a year or every quarter. If too much dust is accumulated on the filter screen and it is not cleaned in time, the temperature in the numerical control cabinet will be too high.

04. Regular maintenance of input/output devices of CNC system

05. Regular inspection and replacement of DC motor brush The excessive wear of DC motor brush will affect the performance of the motor and even cause damage to the motor. For this reason, the motor brush should be checked and replaced regularly. CNC lathes, CNC milling machines, machining centers, etc. shall be inspected once a year.

06. Replace the storage battery regularly. Generally, the CMOS RAM memory device is equipped with a rechargeable battery maintenance circuit in the NC system to ensure that different electrical components of the system can maintain their memory contents. In general, even if it has not failed, it should be replaced once a year to ensure the normal operation of the system. The battery shall be replaced under the power supply state of the numerical control system to prevent information loss in RAM during replacement.

07. Maintenance of standby circuit board When the standby printed circuit board is not used for a long time, it should be regularly installed in the CNC system for power-on operation for a period of time to prevent damage.

2、 Maintenance of mechanical parts

01. Maintenance of the main drive chain. Regularly adjust the tightness of the main shaft drive belt to avoid the loss of rotation caused by the belt talk; Check the thermostatic mailbox of the main shaft lubrication, adjust the temperature range, replenish the oil in time, and clean and filter it; After the tool clamping device in the spindle is used for a long time, there will be a gap, which will affect the clamping of the tool. It is necessary to adjust the displacement of the hydraulic cylinder piston in time.

02. Maintenance of ball screw thread pair Regularly check and adjust the axial clearance of the screw thread pair to ensure the reverse transmission accuracy and axial stiffness; Regularly check whether the link between the lead screw and the bed is loose; If the protective device of the lead screw is damaged, replace it in time to prevent dust or chips from entering.

03. For the maintenance of tool magazine and tool change manipulator, it is strictly prohibited to load overweight and overlength tools into the tool magazine to avoid tool falling or tool collision with workpiece and fixture when the manipulator changes tools; Frequently check whether the zero return position of the tool magazine is correct, check whether the position of the tool change point of the spindle of the CNC lathe is in place, and adjust it in time; When starting the machine, make the tool magazine and manipulator run empty and check whether all parts work normally, especially whether all travel switches and solenoid valves work normally; Check whether the locking of the tool on the manipulator is reliable, and handle it in time if it is abnormal.

04. Hydraulic and pneumatic system maintenance: regularly clean or replace the filter or sub-filter of each lubrication, hydraulic and pneumatic system; Regularly carry out oil quality test and inspection on the hydraulic system and replace the hydraulic oil; Regularly drain the air pressure system filter

05. Accuracy maintenance of CNC lathe machining machine tool. Regularly check and correct the level and mechanical accuracy of CNC lathe machining machine tool.

There are two methods to correct mechanical accuracy: soft and hard. Its soft method is through system parameter compensation, such as lead screw reverse clearance compensation, coordinate positioning, precision fixed point compensation, CNC lathe machining machine back reference point position correction, etc; The hard method is generally carried out when the CNC lathe is overhauled, such as the rail scraping, the pre-tightening of the ball screw nut pair, and the adjustment of the reverse clearance.
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