Thermal errors of a 5-axis CNC milling centre equipped with different spindle units
Type of document
stať ve sborníkuconference paper
Peer-reviewed
publishedVersion
Author
Horejš O.
Mareš M.
Hornych J.
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Thermally induced errors are dominant sources of inaccuracy and are often the most difficult types of errors to reduce today. Software compensation of thermally induced displacements at the TCP is a widely employed technique to reduce these errors due to its cost-effectiveness and ease of implementation. Furthermore, machine tool manufacturers frequently offer a particular type of machine tool in multiple versions, where each version is equipped with a different spindle unit. This leads to different thermal deformation behaviour depending on the specific spindle unit mounted in the machine tool. To demonstrate this difference, an experimental research on a three 5-axis CNC milling centres of the same type equipped with three different spindle units is presented in this paper. Experimentally obtained thermal errors at the TCP from 3 machine tools with different mounted spindle units are mutually compared, showing a significant variation in thermal errors in the Z direction depending on the spindle unit. This fact should be taken into consideration in development of thermal error compensation models, as shown in the case of a modelling approach using transfer functions for a tested 5-axis CNC milling centre.
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