Machine tool machining accuracy and surface roughness

In order to ensure the precision and surface roughness of the machined parts, the machine tool itself must have certain geometric accuracy, motion accuracy, transmission accuracy and dynamic accuracy.

Geometric accuracy refers to the mutual position accuracy of the parts and the shape accuracy and position accuracy of the main parts when the machine tool is not running. Geometric accuracy of machine tools has an important influence on machining accuracy, so it is the main index to evaluate the accuracy of machine tools.

Kinematic accuracy refers to the geometric position accuracy of the main parts when the machine tool is running at the working speed. The greater the variation of the geometric position, the lower the kinematic accuracy.

Transmission accuracy refers to the coordination and uniformity of movement between the actuators at the end of the machine tool transmission chain.

The above three precision indicators are tested under no-load conditions. In order to fully reflect the performance of the machine tool, it is necessary to require the machine tool to have a certain dynamic accuracy and the shape and position accuracy of the main parts under the action of temperature rise.