How to observe fault phenomena and analyze their causes in precision machining

In the process of precision parts processing, there are some obvious malfunctions in the milling machine fixture, such as the inability to guarantee the machining accuracy of the parts, unstable clamping of the parts, damage and severe wear of certain components of the fixture, and the inability of the device and mechanism to achieve operational functions. At this point, it is mainly through detection, observation, and experimental operations to preliminarily determine the main cause of the fault.

Fault cause analysis: If various faults of the milling machine fixture are caused by a single cause, the analysis can be carried out according to general rules. For example, if the part undergoes displacement during the processing, the cause may be a fault in the clamping part; The dimensional accuracy of precision parts processing undergoes regular deviations, which may be caused by a decrease in the accuracy and looseness of the positioning components of the parts; The machining accuracy deviation of the parts is consistent, which may be caused by faults in the tool setting device, etc. If it is caused by multiple reasons, it is necessary to analyze the above single cause before further analyzing the relevant reasons. For example, when a planar milling fixture is found to have a decrease in positional accuracy, it may be due to multiple reasons such as wear on the top of the support limit element and misalignment of the linkage clamping mechanism.