CNC Machine Parts: X-axis Fault Repair

X-axis clearance too much fault repair

Symptom: A CNC machine tool supporting FANUC OMC model XH754 has too large X-axis clearance.

Analysis and processing: X-axis clearance consists of coupling clearance, bearing clearance, screw clearance, mechanical elastic clearance and other components. Remove the X-axis guard plate, shut down the power supply, hold the screw by hand, and turn back and forth, feeling a larger free corner, a larger gap; adjust the X-axis screw bearing clearance, tighten the nut to tighten it and no improvement, so I suspect there is a problem with the screw nut. Loosen the screw nut and the worktable and check that no gap is found. Then open the bearing seat flange and check the screw bearing. Find that the inner ring of the two-point contact bearing (back-to-back) has been tightened together. Under normal circumstances, there should be The gap indicates that there is no room for adjustment of the bearing clearance.

According to the outer diameter of the bearing, a small ring pad with a thickness of lmm is used to subtract the original gap in the middle of the pair of bearing outer diameters, so that the inner ring of the pair of bearings has a clearance adjustment margin of about 0.8 mm. After installation, tighten the bearing back-up nut properly, set parameter 0535 to 0, measure the X-axis clearance with the dial indicator to 0.02mm, set parameter 0535 to 15 and measure the X-axis clearance to 0.01mm. The X-axis clearance can be eliminated. .

X-axis encoder alarm fault repair

Symptoms: A CNC machine tool supporting the FANUC OMC model XH754 has 319 alarms during processing.

Analysis and processing procedures: Check the maintenance manual, indicating that the cause of the fault is an X-axis pulse encoder abnormality or communication error. Check the diagnosis number 760 and find that it has multiple positions. The maintenance manual prompts that the pulse encoder is defective or the feedback cable is defective. The X-axis encoder cable plug M185 is normally detected first, so it is judged that there is a problem with the X-axis serial encoder. To confirm that M184 and M194, M185 and M195 and the corresponding motor three-phase drive lines were exchanged in the cabinet, the fault alarm was changed to 339, and the fault became Z-axis, confirming that the X-axis encoder was defective. After the replacement, troubleshooting.

Overhaul alarm fault repair

Symptoms: A CNC machine tool supporting the FANUC OMC model XH754 generates an overtravel alarm “OVER TRAVEL-X” when the X axis returns to zero.

Analysis and processing: Check that the X-axis alarm is far from the stroke limit, and the X coordinate displayed on the display exceeds the X-axis range, so the confirmation is a soft limit over-travel alarm. Check the parameter 0704 normal, power off, hold down the P key and turn on the NC power at the same time, complete the zero return under the condition that the system does not check the soft limit; also can change the 0704 to -99999999 and back to zero, if no problem, Then change it back to the original value; you can also press the P key and CAN key to turn on the power to eliminate the alarm.

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Henan Carbons New Material Technology Co., Ltd. , https://www.kycarbon.com