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Statements

Subject Item
n2:RIV%2F68407700%3A21220%2F14%3A00226314%21RIV15-TA0-21220___
rdf:type
n11:Vysledek skos:Concept
dcterms:description
Thermal errors caused by internal (motors, bearings, ball screws and their nuts, gear box, etc.) and external heat sources (effect of environment, machine operator, radiation etc.) can cause more than 70% of machine tool (MT) total error. Direct (measuring between tool and work-piece) and indirect (predictive models) approaches to compensation of thermo-dependent tool center point (TCP) displacement can be classified besides expensive redesign of a MT structure. Thermal error indirect compensation is one of the widely employed techniques to reduce the thermal errors. This contribution is a summary of recent scientific work on the modeling of highly nonlinear MT thermal errors with close attention to angular deformational elements occurring at the TCP. Thermal transfer functions (TTF) are used for the identification and control of additional internal heat sinks and sources. The applied method is dynamic and its modeling and calculation speed is suitable for real-time applications. The model solves separately both linear and angular elements participating in thermal error. The approach has been verified on a closed quill (a simple and symmetrical machine tool part), applied to a C-shaped model of a MT which has been chosen as the least favorable from the thermal point of view, and tested on a real MT. Application of internal heat sinks and sources is chosen due to the impossibility of angular deflection compensation by software thermal compensation based on machine axis reconfiguration. Measured temperature close to the heat sources (sinks) is the sole information required by the approximation TTF model. Additional heat sinks and sources cause unwanted linear TCP displacement as well. Nevertheless, their elimination is easy according to the linear behavior of this kind of sources. Thermal errors caused by internal (motors, bearings, ball screws and their nuts, gear box, etc.) and external heat sources (effect of environment, machine operator, radiation etc.) can cause more than 70% of machine tool (MT) total error. Direct (measuring between tool and work-piece) and indirect (predictive models) approaches to compensation of thermo-dependent tool center point (TCP) displacement can be classified besides expensive redesign of a MT structure. Thermal error indirect compensation is one of the widely employed techniques to reduce the thermal errors. This contribution is a summary of recent scientific work on the modeling of highly nonlinear MT thermal errors with close attention to angular deformational elements occurring at the TCP. Thermal transfer functions (TTF) are used for the identification and control of additional internal heat sinks and sources. The applied method is dynamic and its modeling and calculation speed is suitable for real-time applications. The model solves separately both linear and angular elements participating in thermal error. The approach has been verified on a closed quill (a simple and symmetrical machine tool part), applied to a C-shaped model of a MT which has been chosen as the least favorable from the thermal point of view, and tested on a real MT. Application of internal heat sinks and sources is chosen due to the impossibility of angular deflection compensation by software thermal compensation based on machine axis reconfiguration. Measured temperature close to the heat sources (sinks) is the sole information required by the approximation TTF model. Additional heat sinks and sources cause unwanted linear TCP displacement as well. Nevertheless, their elimination is easy according to the linear behavior of this kind of sources.
dcterms:title
Approach to Compensation of Machine Tool Angular Thermal Errors Using Controlled Internal Heat Sinks and Sources Approach to Compensation of Machine Tool Angular Thermal Errors Using Controlled Internal Heat Sinks and Sources
skos:prefLabel
Approach to Compensation of Machine Tool Angular Thermal Errors Using Controlled Internal Heat Sinks and Sources Approach to Compensation of Machine Tool Angular Thermal Errors Using Controlled Internal Heat Sinks and Sources
skos:notation
RIV/68407700:21220/14:00226314!RIV15-TA0-21220___
n4:aktivita
n16:P
n4:aktivity
P(TE01020075)
n4:dodaniDat
n13:2015
n4:domaciTvurceVysledku
n6:7360940 n6:2128187 n6:5190282
n4:druhVysledku
n14:O
n4:duvernostUdaju
n9:S
n4:entitaPredkladatele
n5:predkladatel
n4:idSjednocenehoVysledku
3902
n4:idVysledku
RIV/68407700:21220/14:00226314
n4:jazykVysledku
n7:eng
n4:klicovaSlova
approach; angular thermal errors; internal heat sinks
n4:klicoveSlovo
n12:angular%20thermal%20errors n12:internal%20heat%20sinks n12:approach
n4:kontrolniKodProRIV
[914AF32174D7]
n4:obor
n8:JQ
n4:pocetDomacichTvurcuVysledku
3
n4:pocetTvurcuVysledku
3
n4:projekt
n17:TE01020075
n4:rokUplatneniVysledku
n13:2014
n4:tvurceVysledku
Horejš, Otakar Mareš, Martin Hornych, Jan
n15:organizacniJednotka
21220