The influence of position error on machining accuracy in CNC lathe machining:
Position error refers to the change or deviation of the mutual position between the actual surface, axis or symmetry plane of the machined part relative to its ideal position, such as perpendicularity, position, symmetry, etc.
The position error in CNC machining usually refers to the dead zone error, which is mainly caused by the gap and elastic deformation in the transmission process.
And in processing, the cutter head of the machine tool needs to overcome factors such as friction, resulting in position errors. In an open-loop system, the position accuracy is greatly affected, while in a closed-loop servo system,
It mainly depends on the accuracy of the displacement detection device and the speed amplification factor of the system, and generally has little effect.
The machining accuracy error caused by geometric error in CNC lathe machining;
In CNC lathe processing, the geometric accuracy of the lathe is affected by external factors such as external force and heat generated during the processing.
Geometric deformation of parts machined on a lathe can lead to geometric errors.
According to research, there are two main reasons for the geometric error of CNC lathes: internal factors and external factors.
The internal factors that cause geometric errors of lathes refer to the geometric errors caused by the factors of the machine tool itself.
For example, the levelness of the bed worktable, the levelness and straightness of the lathe guide rails, the geometric accuracy of the lathe tools and fixtures, etc.
External factors mainly refer to the geometric errors caused by the external environment and thermal deformation during the machining process, such as tools or parts in the cutting process,
Due to thermal expansion and deformation, geometric errors are generated, which affect the machining accuracy of lathes and parts.
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