Talking about the Form and Causes of Vibration Pattern in Lathe

The vibration source in the lathe is different, and the form of the vibration pattern is also different. It is explained that the following "graffiti" is caused by the vibration source formed by the axial movement of the main shaft, which is mainly caused by the excessive clearance of the main shaft thrust bearing. Or partial damage, the spindle thrust shoulder is not perpendicular to the axis.

"Circumferential straight grain" is caused by the unstable oscillation of the spindle drive system, which causes periodic oscillation in the spindle rotation. It mainly comes from the impact vibration of the spindle drive system.

The "yin and yang surface pattern" is mainly a problem of the spindle rotation accuracy, and has nothing to do with the feed system. It mainly originates from a certain damage of the main drive system and causes vibration or jitter generated by the main shaft in a certain revolution phase.

"Axial straight lines" use high-speed steel wide-blade low-speed fine car outer circle, sometimes there will be regular axial straight ripples. In this case, the vibration is often caused by the imbalance of the pulley on the first shaft in the headstock. caused.

The “pitch pattern” along the entire length of the machined surface, an abnormal knives appear at regular intervals, mainly caused by the failure of the feed system, and has nothing to do with the main drive system.

Finding the vibration source according to the shape of the surface of the workpiece processing is the easiest and most convenient method. We should pay attention to the observation and accumulate experience in this area. According to the frequency of the vibration pattern, the forced vibration of the vibration source is generated by the external force of the cycle. The frequency and amplitude are determined by the external force, that is, the frequency and magnitude of the vibration source. Following this principle, we can compare the frequency of the surface vibration of the workpiece with the frequency of the vibration source that may exist. If the two are consistent or close, the source may be the cause of the vibration.

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