Four correct maintenance methods of CNC machine tools

As an emerging industry, the direct purpose and result of CNC machine tool maintenance technology is to restore the normal operation of CNC machine tools, thereby ensuring the smooth use of equipment. CNC machine tool is an automatic machine tool, which integrates new technology achievements in various fields such as computer technology, automation technology, servo drive, measurement and machinery, and is a new type of mechanical control technology. Because of its good economic performance and high production efficiency, it is more and more important in production. However, due to the advanced nature of CNC machine tools and the instability of failures, most failures appear in the form of comprehensive failures. Therefore, the maintenance of CNC machine tools is very difficult, and the maintenance of CNC machine tools is not standardized, which makes the CNC maintenance work in a chaotic state. In order to improve the use efficiency of CNC machine tools, combined with the maintenance principles of CNC machine tools, the general maintenance methods of CNC machine tools are discussed.

Observed

When a CNC machine tool fails, it is first necessary to understand the failure phenomenon, how it occurs and the process. If the failure can be reproduced, the course of the failure should be observed. The fault can only be eliminated when the situation is known.

At the same time, observe whether there is mechanical damage; whether there are burning marks, whether the resistance and wires are discolored; whether there is any abnormality in the operation and sealing parts, such as splashing, falling off, overflowing, oil, smoke, sparks, etc. ; Whether the circuit breaker and relay are tripped, whether the fuse is blown; whether the machine tool power supply is out of phase, whether the three phases are seriously unbalanced, whether the machine tool voltage is normal; whether the parts on the electrical components are falling off, broken, stuck, and the joints are loose, etc. ; whether the switch is appropriate; whether the operator's handler is correct, etc. This step is an intuitive step for the maintenance and inspection of CNC machine tools, and it is also a step to test the familiarity of the maintenance personnel with the hardware structure of the machine tool.

odor

Identify smells. When the moving parts of the machine tool are severely rubbed, the electrical insulating layer will be burned, and the smell of oil, smoke, gas and insulating materials will be produced; when the machine tool is discharged, the smell of ozone will be produced, and the sound of discharge will be heard.

investigation

Ask what happened when the machine malfunctioned. Strict management measures are formulated in the CNC machining process, and it is stipulated that the operator can make detailed records in the event of failure. This can avoid maintenance personnel not around, and can accurately reflect the specific situation of the failure. When a CNC machine tool fails, first stop the machine tool to protect the site. The operator should record the failure as much as possible, in which important information should be observed and recorded in detail, such as: the phenomenon at the time of the failure, the location of the failure, and the time when the failure occurred. The state of the bed and the condition of the control system, etc. If the fault occurs in automatic processing mode, the processing program number when the fault occurred, the block number when the fault occurred, the tool number used in processing and other specific information should be recorded. If the machining accuracy is out of tolerance or the contour error is too large, the number of workpieces to be processed should be recorded, and the unqualified workpieces should be retained for specific analysis. When a fault occurs, if the system has an alarm display, the alarm display and alarm code of the system should be recorded. If the failure occurs during the machining of the part, the probability of failure during the machining of similar parts shall be recorded.

precision

That is, diagnosing and repairing faults, which is also an important step in the maintenance of CNC machine tools.