Machine tool machining accuracy is reduced. Machining accuracy is the combined effect of the spindle, moving shaft, tool, tool holder and machining process. Here we mainly discuss the accuracy of the spindle and the moving shaft. The precision changes caused by the tool, the tool holder and the machining process are not discussed. The accuracy of the same position is not good, sometimes it is more than a few dozen wires. In this case, the timing belt wear or the coupling loosening may be large. The solution is to replace or tighten. 2 The accuracy is good when moving in the same direction, and the precision deviation is basically unchanged when moving in the reverse direction. In this case, the gap change may be large. The solution is to make the backlash of the whole week small and basically consistent by adjusting the plug iron, and then use the parameters to compensate (0I numerical control system: 1851 ~ 1852; KND numerical control system: 53 ~ 55; 802S / D numerical control system :32450). Inadequate air pressure of the spindle loading and unloading knife, changes in the size of the shank puller, and changes in the knives can cause the loading and unloading knives to be unsatisfactory. The air pressure should be more than 6Kg, the appropriate pull nail should be selected, and the position of the clamp device can be adjusted. Tool magazine (bucket type) failure a. Tool number error count switch count error causes the tool number to be disordered. The specific reasons are as follows: 1 There is iron filings near the counting switch or the switch position is loose, causing miscounting; removing iron filings and dirt, adjusting the switch position. 2 The looseness of the tool magazine cam mechanism makes the indexing inaccurate; adjust the cam gap; or after the above two steps are processed, rotate the cutter head in the manual mode: the No. 1 tool position is facing the main axis, and the M33 command is executed in the MDI mode to reset the counter. . b. The non-rotation of the tool magazine is mainly caused by the failure of the tool magazine motor itself or the power supply line. Measure the motor power and the three resistors to determine if the motor is damaged. Check if the air switch of the motor line trips, such as tripping, and close it. c. Change position of the tool change plane The second parameter of the Z axis is the tool change plane. The Z axis load and other faults will cause it to change. It needs to be re-adjusted and set the parameters. d. The spindle orientation position changes. The spindle needs to be oriented before the tool change. Fixed position, otherwise the tool holder will be damaged when the tool is automatically changed. If the directional belt is swayed or worn up and down, and the orientation parameters are changed, the orientation will be inaccurate. Check the orientation device and adjust the orientation parameters. In conclusion, the machine tool may have various failures. As long as we are familiar with the machine tool and master some troubleshooting methods and troubleshooting methods, most of the faults can be diagnosed and eliminated quickly to reduce downtime and give full play to the benefits of CNC machine tools. . (Finish)
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