2 A few examples of the author's near prison, for everyone to take a test. As we all know, the rotary encoder or scale is used as a feedback element on CNC machines. The machine needs to find the reference point after each machine to determine the coordinate point of the machine, which is what we often call zero. After the rotary encoder fails, the zero return operation cannot be performed normally, and the alarm will be triggered because the correct reference point cannot be found. Here are a few special faults encountered. Fault phenomenon Taiwanese CNC lathes are adopted, and the system is tilted to 0. When the tool touches the workpiece during machining, 400 alarms are generated, that is, servo alarms. Diagnostic and exclusion check plus. 1 program is correct. Inspection, spare shaft mechanical transmission part is not obstructed, and the movement is flexible. Diagnostic parameters show 1 axis overload. Therefore, all parts of the motor are checked, but they are all normal, and the voltage of the power supply voltage is normal. The cable joints of all parts are also normal. Replacing the SERVOPACK axis card and power unit still does not correct the problem. Later, contact the manufacturer to replace the encoder in the motor and troubleshoot. Sand as the material of the Zen yuan sweat machine rear shaft, less than the reference core axis can slow down during the zero return process but does not stop, the maximum stroke of each action does not exceed 40 until the hard limit is pressed, the panel coordinate value is abrupt, the alarm Diagnostics and troubleshooting Check the parameters in the machine tool are correct, the peripherals such as the cable connection are not found. The machine can operate in manual mode and can display coordinate values. The machine tool can be positioned, indicating that the scale should not be bad. Check the grating ruler for Germany, 1 product. After knowing that the zero return method used by the slave scale is different from other company products, in order to avoid finding reference points in a wide range, The reference mark is encoded by distance. Add a scribe next to the raster line. The reference position can be found by two adjacent reference marks, ie it can be found within any 40 or 80, depending on the scale model. After removing the shield of the machine tool, it was found that the oil mist entered the grating scale due to the long use time, the zero mark was blocked, and there was no zero pulse output, which caused the machine to not find the zero point. Because the device is maintenance-free, it was replaced with the manufacturer and the fault was eliminated. Therefore, the machine tool cannot return to the correct reference point. The diagnosis and elimination of this machine adopts the detachment system. The machine tool does not have a deceleration block. There is only one hard limit stop device. The working principle of the machine zero return is clear. The axial direction is set to move. When the switch is decelerated after the switch, the number of the screw system is released from the zero point pulse and the first zero point pulse is received. In the manual mode, the shaft is moved to the hard limit position. After the limit alarm is eliminated, the shaft is shaken to the limit switch 5, and the parameter 2021 is changed and then turned off. After the power is turned on, the fault is eliminated. The machine was suddenly powered off. We also do not have to stick to the fixed form or interfere with the machine tool failure caused by misoperation. In order to carry out the cumbersome operation in sequence, sometimes it is easy to pull the tool change mechanism of the machine tool with a simple number. They are all made up of 4 parts, and the cutter head is pushed into the cutter head and the cutter head is clamped. When the tool change mechanism has a chaotic knife or the tool fails to be positioned and clamped, it can be recovered manually by the above steps, but it is quite troublesome. In fact, sometimes we have to observe carefully that we can find that the buckle is faulty. The cutter head is turned into position but the clamp is not clamped. Diagnosis and elimination According to the electrical principle of the machine tool, the corresponding solenoid valve wiring is found. The machine tool 10 indicates that the cutter head of the machine tool is in place. However, in the state of failure to clamp, open the electrical cabinet to find the solenoid valve wiring pushed into the cutter head. It can be seen from the relay that it is currently not powered. Look for the temporary line to quickly disconnect the solenoid valve to solve the problem. Therefore, the failure of the CNC machine tool is treated. We should also use the theory divided in dialectics to deal with both! Considering its versatility, it must also consider its particularity. After the fault occurs, both must be considered in order to solve the problem accurately and quickly. Provincial Automobile Brake Co., Ltd. Equipment Department, zip code 453500, electricity (Finish) Changzhou Mayebikes Co.,Ltd , https://www.mayebikes.com
CNC machine repair example