Common fault handling of electrical systems for CNC electrode processing machine tools - News - Global IC Trade Starts Here Free Join

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CNC equipment is an advanced processing equipment with high degree of automation and complex structure, which not only can reduce the labor intensity of workers, improve the production environment, and promote the development of modern industry. At the same time, with the promotion and application of modern technology equipment, the maintenance of mechanical equipment and Overhauling problems has become a universal problem in the modern lathe processing industry. In the process of work practice, enhancing the awareness of lathe maintenance and exploring the development of lathe technology is an important measure for the development of modern industrial innovation. The application of CNC electrode processing machine has improved the output and quality of the graphite electrode industry and obtained considerable economic benefits. However, due to the repeatability of lathe processing and the limitations of the lathe's own load-bearing operation, the electrical system of the electrode processing machine often fails. The equipment is damaged, the production and processing time is delayed, the stable operation of the machine tool is shortened, and the service life of the machine tool is reduced. In this paper, the electrical system faults of CNC electrode processing machine tools are deeply discussed, and combined with their own electrician practice, a technical maintenance and repair method is proposed. Typical Fault Analysis of the Electrical System of CNC Electrode Machining Machines At present, the degree of integration of the electrical control system of CNC electrode processing machine tools is very high. In the specific operation, the common electrical system failures are as follows:
1) The main power supply of the machine tool is faulty and cannot be powered normally. When the CNC machining machine starts, the main control panel indicator light is on, the operating system powers up the button, the indicator light is also on, but it is extinguished instantly, and the system fails to power on. The reason is that the main power of the machine itself is faulty or there is a problem with the input and output circuits.
2) The CNC system program cannot be written. During the use of CNC electrode processing machine tools, CNC system often has system program loss failures, and often encounters program write failures. There are many reasons for such failures, usually reflected in memory power failure or processor failure. In two aspects, when the system is powered on, the tape machine is ready, press the secondary control panel button, the memory power failure lamp does not go out, the tape machine does not work, and the program write fails.
3) The machine power cord is grounded. When the machine tool has a power line ground fault, the specific performance of the machine is ready. The cycle start button starts to run automatically, but the total air switch trips, the purpose is to protect against leakage. The power line ground fault is generally due to the grounding point of the motor circuit.
4) The machine tool spindle crawls. The CNC machining system of the machine tool is a closed-loop control system. In the automatic running state, when the spindle speed is 2400r/min, the spindle has a crawling fault, and the system displays an alarm prompt. At the same time, the spindle speed of the machine tool is extremely unstable.
5) The servo amplifier of the machine tool servo system is faulty. The fault phenomenon of the servo amplifier of the machine tool numerical control system is reflected as follows: After the system is powered on, after the operation of the main console running preparation button is completed, the CNC does not have a signal prompt, which causes the machine to stop running and cannot work. CNC electrode processing machine tool electrical system fault technical processing CNC electrode processing machine can be divided into electrical system and mechanical hydraulic system two parts, of which electrical system includes CNC system, logic control system, servo system, input and output circuits. When the electrical system fails, the repairer should not rush to blindly disassemble the electrical components. The time, process and specific phenomena of the machine electrical system failure should be specified. When dealing with faults, you should carefully analyze and understand the fault phenomenon, identify the key to the problem, and ensure that the problem is resolved accurately and quickly. In the following, combined with its own electromechanical maintenance practice for many years, this paper expounds several methods for fault repair of the electrical system of CNC electrode processing machine:
1) Observe the diagnostic method. After the fault of the electrical system of the machine tool, the initial diagnosis of the electrical system should be carried out first. Observe whether the various switch settings on the console are correct, whether the power supply indication is normal, whether the various connecting parts are loose or even falling off. Early detection of obvious problems quickly removed the apparent surface failure of the electrical system.
2) System self-breaking method. The electrical system of the CNC electrode processing machine is equipped with a system automatic diagnosis program. When the electrical system failure is within the self-diagnosis range, the system will automatically generate corresponding information from the main console and the indicator light or digital display of the controller panel. display. Determine the location of the fault type by finding the corresponding fault diagnosis code, and follow the diagnostic steps to solve the fault step by step.
3) Partition exclusion method. The partition elimination method generally divides the entire electrical system into several large areas in the case of complicated electrical system faults, and eliminates the parts that have no faults one by one, and finally diagnoses the fault nature after clearing the specific location of the fault. Partition exclusion is a very effective method in electrical system troubleshooting, helping technicians quickly identify fault locations and troubleshoot them.
4) Signal detection method. Generally speaking, on the circuit board of the electrical system, the designer (information source: http://) has relevant DC voltage test points for convenient detection in the future, and the technicians use necessary The detection tool detects the relevant DC voltage values ​​of voltage, current and resistance of various parts of the electrical system, and can quickly diagnose the high-load, short-circuit, grounding and other related power failures occurring in the machine system.
5) Waveform analysis method. Regarding the output fault detection of the electrical system, the output waveform can be actually observed using an oscilloscope or a recorder. The DC drive system is used to determine whether the output voltage of the electrical system is determined by analyzing a given voltage waveform during the analysis of the quality problem of the graphite electrode. normal.
6) Logic analysis. The development of modern science and technology has improved the reliability of the electromechanical numerical control system itself. For the related faults that often occur in the system, it can generally be attributed to input and output loop faults. When the input and output loops fail, the technician can use the programmer to check whether the working status of each electrical component is correct, thereby determining the fault point and eliminating the fault problem in time.
7) Spare parts replacement method. After the failure of the electrical system, if the relevant spare parts are sufficient, the replacement method can be used to determine which parts are damaged. This method is simple and practical, and is more practical. For example, the processor of the AB7360CNC system consists of 10 modules. When the processor fails, it is sometimes difficult to determine which module is damaged. The damaged module can be quickly detected by replacing the spare parts. Reduced delay time.
8) Special treatment method. Today's CNC system has entered an open development stage. The inherent defects in the software development and operation of the relevant machine tool electrical system will cause some electrical fault conditions to be analyzed. For this fault phenomenon, special measures can be taken to deal with it. People can explore relevant effective technical measures in their long-term practice.
Summary With the continuous development of CNC machine tools and the use of modern high-tech detection and analysis instruments, the self-diagnosis function of CNC electrode processing machine tools is getting stronger and stronger, and a variety of fault handling methods are integrated to explore the failure of the electrical system of CNC electrode processing machine tools. Solving technology is the need for the stable development of the modern electrode processing industry. Therefore, in the process of electrical maintenance practice, enhancing maintenance awareness, improving professional skills, exploring electrical technology development, and reducing the occurrence of machine tool electrical system failures are important measures for the innovation and development of modern electrical equipment management and maintenance.