In order to adapt to modern CNC maintenance of enterprise development needs and to enhance the quality of numerical control equipment maintenance, should be put in place the following three: 1, Analysis of failure causes in place. Maintenance work in the past, people used to find fault and troubleshooting as maintenance of the content. However, this is only part of the completion of the repair work is more important to analyze to determine the causes of failure to take measures to prevent recurrence of similar failures. Such as
To meet the modern CNC maintenance needs of business development, improve the quality of NC equipment maintenance, should do the following three in place: 1 cause of failure in place.Maintenance work in the past, people used to find fault and troubleshooting as maintenance of the content. However, this is only part of the completion of the repair work is more important to analyze to determine the causes of failure to take measures to prevent recurrence of similar failures. For example, I have a unit of German company manufacturing high-precision CNC Centerless cylindrical grinder, used for the Siemens PLC products. The machine was put into use less than a year, there PLC’s I / O modules on an output driver transistor burned. As the equipment has not yet out of warranty, the German companies come repair. They just changed the PLC output board, machine tool operation would call it a day to return to normal. The results further use about half a year, the same failure occur again. Through our analysis, the output point of load is controlled by automatic grinding wheel dressing feed control valve, solenoid valve coil DC24V current about 1.1A, while the PLC output driver transistor rated continuous output current of 0.5A, obviously, the load exceeds rating. Is a machine design defects caused by negligence. If we only replace or repair the PLC board, the same failures will happen again.Therefore, the need to improve on the machine circuit.
2, to take measures in place. The so-called measure is the total elimination of the causes of production, so that similar failures do not recur. Measures in place, is valid and reliable measures. Accordance with the use of mature technologies under the existing conditions or structural principles, attention to comply with national safety standards, not to the emergence of new non-reliable links, generate new sources of error. In the example above, a lot more economical and feasible measures to take which is better? Factors to consider are: the maximum signal frequency, load the form of resistive or inductive, electric cabinet installation space, dressing line space, the existing spare parts and so on. The above factors, to increase relay driven approach. Contact relay coil DC24V/40mA rated current capacity of 5A, PLC an I / O relay output rated current 500mA drive coil and relay contacts rated 40mA load current 5A solenoid valve coil load 1.1A, capacity more than enough. As the inductive load, set the relay coil freewheeling diode and freewheeling diode solenoid valve coil. After more than a year to run, never again fail.
3, maintenance records should be in place. We have specific content provides maintenance records should include the following: 1) failure phenomena, 2) cause of the malfunction, 3) solution, 4) the remaining issues, 5) the date and downtime, 6) maintenance of the staff. In addition, for improvement, transformation tools, complete and accurate drawings and additional information is essential. This, coupled with the maintenance of transformation of the construction according to national standards, line number, marking devices offer a variety of machine tools for the future maintenance work to lay a good foundation. For example, in the examples above, we will change some of the machine tool electrical circuit diagram made a note to add a drawing, no matter who the future maintenance of the machine tool, will be very convenient. Can we have a “scratch”, a direct reflection of the work of maintenance personnel responsible, but also the embodiment of technical quality. Maintenance work is the basis for standardization, so we can all take action to better maintenance of CNC equipment.
Posted in