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CNC lathe without alarm failure treatment

Article source: Clicks: Pubdate:2017-11-05

As one of the most widely used CNC machine tools today, CNC lathe combines mechanical, electrical, liquid, microcomputer, automatic control and testing technology into a mechatronic product with advanced technology and reasonable price , Plays a key role in production. It is mainly used for processing rotating body parts such as shafts and disc sleeves. It can process the inner and outer cylindrical surfaces, conical surfaces, circular arcs and threads automatically through the program, and perform grooving, drilling, expanding and reaming work In recent years, CNC turning centers and CNC turning centers have been developed to make it possible to complete more machining operations in a single fixture and improve the machining quality and production efficiency. Therefore, it is particularly suitable for the machining of turning parts with complicated shapes.

CNC lathe control system is very high degree of intelligence, which are designed to fault self-diagnosis function. Under normal circumstances, when there is a fault alarm information appears, according to manual troubleshooting methods, most of the failures can find a solution. Machine tools in use there are some failures that no alarm, the phenomenon is not obvious. It's not as easy to deal with this situation as it is well documented. Some machines in use after a failure, if not pay attention to will cause the workpiece scrapped, so more difficult to deal with. This troubleshooting, when the maintenance staff lack of certain work experience, the handling often make the wrong judgment, resulting in unnecessary economic losses or to extend the maintenance time. To find out the cause of such failures, we must first find out its true phenomenon from the various surface phenomena criss-cross (the "phenomenon" is the real situation of the fault), and then from the phenomenon of the confirmed failure to find The reason for the occurrence.

1, the fault is in normal work or just boot appeared.

2, the number of occurrences, is the first time or has occurred many times.

3, confirm the machining process of the machine will not be wrong.

4, other personnel whether the machine was repaired or adjusted.

The following is that we encountered in the maintenance of some non-alarm fault handling analysis, for reference.

Fault 1: In the use of CNC lathe, there is normal movement of manual, automatic zero back to move a certain distance after the move, re-open the manual move and normal. Lathe economic NC, stepper motor, manual movement, due to the slower speed of the normal automatic movement back to zero, the rapid movement of a longer distance, the phenomenon of mechanical stuck. According to the failure analysis, mainly mechanical reasons. This failure, often without attention in the repair occurs, so should pay attention to the work, to avoid this phenomenon.

Fault 2: After turning on the machine screen no display. The exclusion of this failure, the first is to make the screen work properly. Sometimes it's just a part of the reason. But in many cases, there may be a variety of failures. A FANUC SERIESO-TD system operation panel on the power switch has been pressed, red, green lights are bright, check the switch in the cabinet and the main part of no exception, all control circuits are no problem, reopen after shutdown, the same fault. The investigation, due to poor working environment, machine site loose ground, leading to static electricity out of this failure. After connecting the ground by MODE1 way to start the system in normal.

Fault 3: The same is a FANUC SERIESO-TD system-controlled lathe, whether the normal start, the default data to start or store data starts, after power on, the normal operation can not appear on the screen, analyze the cause of the malfunction is PLC users appear after downloading When the ECU has not yet written the PLC program from the static memory to the FLASH, the ECU is powered off and the PLC user program can not be started by the power-off method. The PLC user program in the PLC programming software must be used to start the downloaded PLC user program to cause the ECU to be destroyed. After replacing the ECU module, the system is in normal condition.

Fault 4: In CNC equipment, there is no alarm up to the machine error or size is not allowed. Such as CNC lathe in the diameter when the phenomenon of large small. The reason for this failure, in general, is the screw shaft and motor coupling structure of the frequency and probability of failure occurs after the phenomenon is also different, some sizes will only increase in the negative direction, but some plus or minus The possibility of changes in direction will occur, according to experience, the middle of the coupling with flexible coupling, the increase is basically a negative increase, and the intermediate use of key connection of the two failures will occur.

Failure five: JBNC320B teaching CNC lathe, threaded thread in the process, the item thread chaos buckle. Began to think that there is a problem with the system software. After deleting the original software, re-install the system, the results of the system failure has not been eliminated. After the analysis may be a mechanical failure, opened the lid inspection found that the mechanical connection between the spindle and the spindle encoder loose, after recalibration fixed, the fault is eliminated.

Failure VI: FANUC SERIESO-TD system control a lathe, the system starts, the stepper motor does not work, but the screen display position is changing, and the drive marked with RDY green LED. By analyzing the search, is the operating error, the system also works in the program test PRT way one. After canceling this mode, the fault is eliminated. This failure is sometimes caused by a drive failure. Therefore, we must carefully analyze and treat correctly.

In short, no alarm alarm CNC lathe are mostly caused by some combination of factors. In the repair of CNC lathes, judging experience in this area can only be groped in practice, constantly summarized and continuously improved to meet the needs of modern industrial equipment repair work.