With the rapid development of domestic CNC machine tools, CNC machine tools gradual failure time high. However, the current chaotic work CNC repair, simply can not adapt to the pace of the rapid development of numerical control industry. In order to adapt to modern CNC manufacturing repair work, enhancing the quality of numerical control equipment maintenance, then the standard CNC repair industry is imminent. This paper explains the five-step method in place, it has the availability, sustainability, CNC maintenance for the norms laid a solid foundation for the industry.
[Key words] CNC maintenance five-step method in place to explore
I. Introduction
With the rapid development of our machining, CNC machine tools home more and more. As advanced CNC machine tools and fault instability, the majority of failures are the form of an integrated fault, so the maintenance of CNC machine tools more difficult, and numerical control machine tool maintenance work are not standardized, making maintenance work in a chaotic NC state, in order to regulate the maintenance of NC, CNC Machining of value, this paper proposes five steps in place CNC Maintenance Act.
Second, five-step method in place
1. Fault records are in place
NC machine tool failure, the operator should first stop the machine, protecting the scene, and the failure of records as detailed as possible, and notify maintenance personnel.
â‘´ the case record when failure occurs
1) The failure of the machine model, using the control system model, system software version number.
2) faults, the failure of the site, and the failure of the phenomenon of machine tool and control system.
3) the failure of the system in which the mode of operation.
4) If the fault occurs at the automatic mode, the failure should be recorded when processing numbers, paragraph numbers faulty procedures, processing tool used numbers.
5) In case of poor or ultra-precision contour errors such as too much trouble, should record No. workpiece to be machined, and failed to retain the workpiece.
6) in the event of failure, if the system alarm display, the recording system of the alarm that the situation with alarm number.
7) The record fails, the location of each axis tracking error value.
The record fails, the axis of the moving speed, moving direction, the spindle speed, steering and so on.
⑵ the frequency of fault records
1) failure occurs when the patients and cycles.
2) failure occurs when the environmental conditions.
3) If the fault occurs when processing parts, should be recorded when machining the same workpiece failure probability of the situation.
4) Check the fault is with the “Feed Rate”, “ATC means” or “thread cutting” and other special moves about.
⑶ failure regularity records.
â‘· record of failure of the external conditions.
2. Fault inspection in place
Troubleshooting of maintenance personnel, should the phenomenon under fault and fault records, carefully control systems, machine instructions for the roof inspection to confirm the cause of failure. When the numerical control device fails, the fault must understand the phenomenon, the first time to the operator fails to understand the situation, the possible observation of the process failure occurs, failure is observed occurred under what circumstances, how it happened , cause what consequences. Figure out the fault phenomena, then according to machine tools and CNC system works, you can quickly diagnosis and troubleshooting, to restore the device to normal use. Troubleshooting, including:
â‘´ working conditions of machine checks.
⑵ machine running checks.
⑶ connection between machines and systems checks.
â‘· CNC device visual inspection.
Maintenance checks should be recorded raw data, status, more detailed records, maintenance more convenient for users to best develop a maintenance log failure, the system fails, the operator can fill in a timely manner according to the table a variety of original materials for maintenance reference.
3. Diagnosis of fault place
Fault diagnosis is the next step for NC machine tool maintenance, fault diagnosis is in place, directly affects the speed of troubleshooting, but also serve to prevent the occurrence of faults and expanded role. First of all maintenance personnel should be guided by two principles:
(1) failure to fully investigate the scene. This is a maintenance staff to obtain first-hand materials, maintenance of an important means.
(2) the causes of serious analysis. Analysis of failure, maintenance staff should not be limited to CNC part, but to strong power of the machine tool, mechanical, hydraulic, pneumatic and other aspects detailed examination, and comprehensive judgments, to really treasure, and finally troubleshooting purposes.
1) direct method. 2) system since the diagnosis. 3) Parameter Test. 4) Functional program testing method. 5) Parts Exchange. 6) Measurement of Comparative Law. 7) The principle of analysis. 8) Percussion Method. 9) the local heating method. 10) transfer method.
In addition to fault detection method described above, there are plug Act, the voltage bias of law, percussion method and so on, these inspection methods have different features, maintenance staff, according to different phenomena comprehensive analysis on the failure to narrow the scope of failure, Troubleshooting.
4. Maintenance methods in place
In CNC machine maintenance, repair method of choice in place does not place a direct impact on the quality of machine maintenance, repair process in the maintenance of commonly used methods of the following:
(1) initialize the reset method. Since the system due to transient fault alarm, available hardware reset or turn the system power switch to clear the fault, if the system working storage area as power down, plug the battery voltage circuit board or cause confusion, you must remove the system initialization , make clear the former should be noted that copies of data records, if the fault still can not rule out after initialization, the hardware diagnostics.
(2) parameters change, the program also Dharma. System parameters are determined based on system functionality, parameter setting error may result in system failure or a function is inactive. Sometimes, because of user error can result in downtime, which can be used to inspect the system search capabilities and correct all errors, to ensure their normal operation.
(3) regulation, the best method of adjustment. Regulation is the most simple way. Through potentiometer adjustment, amendment to system failure.
(4) spare replacement method. Diagnosed with the good and bad parts replacement circuit board, and do the appropriate initialization started to make the machine into normal operation quickly, and then repair or repair of broken plate, which is the most common troubleshooting methods.
(5) to improve power quality evaluation. Current regulated power supply is typically used to improve the power supply fluctuations. Capacitor can be used for high-frequency interference filter, these preventive measures to reduce the power board failure.
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