Common failures and treatment of roll grinding machines
1) Four safety devices.
Four emergency stop buttons and four safety devices are the main components in roll grinding machines. For the four safety devices, the main ones are the yellow safety gate, the alignment measuring scale, two sensors and the anti-collision rubber strip. These four safety devices are all sensitive parts and are safety protection devices. If one of these devices is touched during use, it will cause an immediate stop of the program.
First, when lifting the rolls, always open the yellow safety gate and close it only when running the program. Secondly, two sensors are fixed behind the bed box to be able to prevent the rolls and headstock from being hit by the grinding wheel. In actual grinding, before the rolls have reached the standard grinding, the machine starts to alarm and the safety device is touched so that grinding is automatically terminated. Although a reset was performed, the alarm could not be eliminated. After continuous inspection and analysis, it was found that the sensor was stained, which in turn caused the light signal to not transmit properly and the signal to not be received properly by the receiver, resulting in a misjudgment of the CNC and an alarm. In this case, the two sensors need to be cleaned regularly. In the working principle, the sensor is to judge the proximity of the rollers and headstock by the intensity of light. Therefore clarity is very critical. At the same time the sensor can not collide when installed, it is easy to lead to the deformation of the support. Third, the role of measuring tape on the grinding wheel stand is mainly to align the rolls, coarse adjustment tile. The measuring tape is put down just at the center line of rotation, and after the rough adjustment of the towa, the measuring tape should be fixed, and the screws must be fixed in place and in contact with the position sensor, so that the CNC can better receive the signal.
2) Soft landing.
If the soft landing is completely descended, on top of the operating table, there should be two phases of green signal lights. However, in actual operation, even if it is a soft landing, there will be a phenomenon that the signal light does not light up, which leads to the inability to rotate the rolls properly and run the program. On top of the alarm will appear the message that it is necessary to descend to the bottom of the soft landing and roll rotation. The reason for this phenomenon is mainly due to vibration, the bottom sensor can not well sense the induction position of the soft landing, or is in the signal transmission, the socket is loose, which in turn can not transmit the signal. Encounter this situation, to use a small wooden hammer to and induction hammer of the thin wire rope for suspension, thus making the soft landing signal light normal. Test both sides separately until normal. You can directly punch a hole under the soft landing cover and introduce the thin wire rope for induction in that hole. If the signal light does not come on properly, you need to keep pulling on the small rope until the signal light comes on properly. If it is said to be a case of a loose socket, then the socket should be wrapped.
3) Failure in the grinding front.
During the grinding process, when the flaw detection program needs to be executed, the measuring system moves to the detection position on the tailstock side of the roll, the detection device approaches the roll, but the V-axis does not move, and a fault alarm of "Check INSPECTER communication" appears on the operator's computer, and the flaw detection program is not executed at this time. If there is no manual intervention, after the computer executes the grinding program, the alarm "Waiting for test results" appears and the roll roundness test is not executed. Cause: Due to transmission, the eddy current emitted by the probe on the surface of the roll is not returned and the alarm appears after a long waiting time. Solution : In this case, you can close the INSPECTER software and restart it again; or interrupt the running program and start again.
4) The manual Z-axis does not rotate.
The manual Z-axis does not rotate. Most of this phenomenon occurs because the chain between the Z-axis and the flip box device is not in place.
(5) The Z-axis filter is clogged.
The roll grinder has a defective seal, which tends to emulsify the Z-axis lubricant, resulting in a clogged Z-axis filter or increased pressure. This failure can be solved by replacing the Z-axis filter and replacing the Z-axis guide at the right time for replacement. Due to long-term movement, the pulleys on the roll grinding machine develop grooves in the guideway, causing a greater impact on the accuracy of the grinding machine. This situation can be solved by pasting stainless steel strips and modifying the pulley type and adjusting the running height so that it remains at the same height as before and the running accuracy will not be affected accordingly.