The analysis of the array must first thoroughly study the overall structure, motion form, electrical control part principle and mechanical transmission principle of the system, comprehensively consider the two factors of electromechanical, clear the train of thought, take proper analysis methods and correct testing methods, as soon as possible Find out the cause of the failure to determine the appropriate countermeasures. It should be analyzed and eliminated according to mechanical failure; the order of electrical failure analysis and elimination. In the analysis and elimination of electrical faults, the analysis and elimination of software faults should be carried out first, and finally the analysis and elimination of hardware faults. Analysis and elimination of the main I mechanical array For the mechanical part, after starting the machine, firstly, several simple graphic processing programs should be manually prepared. After the keyboard is input, the execution result is observed. By checking the mechanical shifting mechanism, adjusting the backlash compensation eccentric sleeve, and adjusting the stepping motor, the failure of the glitch in the Y-axis commutation is quickly eliminated. Overhaul process. But the rest of the faults remain. Since the mechanical part of the fault has been eliminated, how can the loss of the X-axis in the negative direction or even the stop phenomenon is detected by the horizontal test horizontal rail and vertical rail, the beam guide itself has a certain installation inclination (left high right low, ie X The axis is reversed high and the forward direction is low. When the X-axis reverse feed is approaching the commutation, the X-axis feed is small and the X-axis feed is small and climbing. If the drive torque is small, the drive torque is small. , it is very likely that there is a loss of step or even lost. It can be seen from the above analysis that since the inclination of the beam guide is present at the time of installation, the reverse rotation or even the stop of the X-axis is not caused by the inclination of the guide rail. Analysis and elimination of electrical system faults For the CNC-4A digital gas cutting machine, the mechanical part and circuit hardware are equivalent to limbs and body, while the system software and machining program are equivalent to the mind and heart of the machine tool. Therefore, the analysis and elimination of electrical system faults is crucial. Analysis of software failure Because the circular cutting material of the numerical control gas cutting machine adopts the circular interpolation program, the two measures of reducing the load, increasing the driving voltage and increasing the driving torque by taking off the secondary cutting head are adopted, and then the circle and the straight line are manually prepared. The combination of arc and line is input to the random access memory through the keyboard. The processing results show that the fault is temporarily eliminated, indicating that the system management program and application are correct, which quickly eliminates the factors causing the failure of the CNC-4A system software. Analysis and maintenance procedures such as. However, the fault still exists after the sub-cutting head is connected, which indicates that the fault is in the hardware part outside the system board. The hardware circuit fault analysis can be seen from the above analysis process and test results. The system board, CPU, system program, user processing program, power supply voltage, optical motor, etc. all work normally, and the fault-generating part is likely to be in the microcomputer I/o. Port to the circuit between the stepper motors. It can be seen from the circuit that the three-phase pulse outputted by the 280-Plo port is sent to the corresponding winding of the stepping motor through the inverter, photoelectric isolation, voltage amplification, power amplification. For the analysis of this part of the circuit, first measure the DC voltage and static working point of each part to make it normal, then run the manually programmed processing program, and measure the detection flow with an oscilloscope or voltmeter as shown. For the X-axis channel, when the PAI port outputs a high level, the corresponding TS collector should be high. The measurable result shows that the collector voltage of the tube is significantly lower than the other two phases, resulting in insufficient opening of the FET channel, and the current of the phase winding is reduced, thereby causing the driving torque of the X-axis stepping motor to decrease. After the hardware failure check flow chart is changed, the sub-cutting head is connected, the manually programmed machining program is re-run, the system returns to normal, not only eliminates the straight line segment during the curve processing, but also the running sound of the X-axis stepping motor is restored. To the normal state. Summary From the above analysis of the special failure of the CNC-4A numerical control gas cutting machine, it can be seen that the numerical control machine tool is a typical electromechanical unity product with complex structure and high degree of automation. Therefore, the fault modes of the machine tools in operation are different. Different, intricate, which makes it difficult to operate and maintain to a certain extent. The analysis method for this special case fault introduced in this paper can be generalized to the general situation. (Finish) Steel Bar Cutter and Bender Machine Portable Rebar Cutting Machine,16Mm Rebar Bender NINGBO MAX MACHINERY CO.,LTD , https://www.max-machinery.com