General steps for fault diagnosis of CNC machine tools
(1) Know the fault situation specifically. For example, when the CNC machine tool flutters, vibrates or overshoots, it is necessary to find out whether it is all axes or a certain axis, if it is a certain axis, is it a whole process or a certain position; is it a motion or only Rapid, feed state occurs in a certain state of speed, acceleration, or deceleration. In order to further understand the fault situation, it is necessary to carry out preliminary inspection of the CNC machine tool, and focus on checking the display content on the screen, the fault indicator light in the control cabinet, the status indicator or the digital tube for alarm. When the fault condition is promised, it is best to start the test and observe the fault condition.
(2) Analyze according to the fault condition, narrow the scope, and determine the direction and means of finding the fault source. After a comprehensive understanding of the fault phenomenon, the next step can be based on the fault phenomenon to analyze the possible location of the fault, that is, which part of the fault may cause such a phenomenon. Some faults are less connected with other parts, and it is easy to determine the direction of the search. Some faults have many reasons. It is difficult to determine the fault source search direction by simple method. It is necessary to carefully check the relevant CNC machine data to find out the fault-related information. Various factors determine several search directions and search them one by one.
(3) Find the fault source from the table and the inside. Fault finding is generally easy to difficult, from the periphery to the inside. The so-called difficulty, including the technical complexity and ease of disassembly assembly. The degree of technical complexity refers to the degree of difficulty in determining whether or not there is a fault. In the process of troubleshooting, you should first check those parts that can be inspected directly or after a simple disassembly, and then check those parts that require a large amount of disassembly work before they can be accessed and inspected.
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