Real-time compensation of a 5-axis CNC milling centre thermal errors considering different spindle units

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F20%3A00341715" target="_blank" >RIV/68407700:21220/20:00341715 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.euspen.eu/resource/real-time-compensation-of-a-5-axis-cnc-milling-centre-thermal-errors-considering-different-spindle-units/" target="_blank" >https://www.euspen.eu/resource/real-time-compensation-of-a-5-axis-cnc-milling-centre-thermal-errors-considering-different-spindle-units/</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Real-time compensation of a 5-axis CNC milling centre thermal errors considering different spindle units

Popis výsledku v původním jazyce

Thermal errors of machine tools are the main contributor to geometrical inaccuracies of machined workpieces. Successful reduction in thermal errors has been realized through thermal error compensation techniques in the past few decades. The effectiveness of thermal error models directly determines the compensation results. However, most of the current thermal error models are empirical and highly rely on the collected data under specific working conditions, neglecting the insight into the underlying mechanisms that result in thermal deformations. On the contrary, the transfer function based correction method lead to promising results as was shown in past studies. Furthermore, machine tools manufacturers frequently offer the same type of the machine tool equipped with different spindle units. Consequently, it leads to different thermal behaviour depending on the specific spindle unit mounted in the machine tool. The research presented in this paper shows a dynamic approach for thermal error compensation of 5-axis CNC milling centres considering different spindle units. Experimentally obtained thermal errors at the TCP from milling centres with 3 different mounted spindle units were mutually compared, showing a significant variation in thermal errors in the Z direction depending on the specific spindle unit. System identification theory is applied to build the dynamic thermal error model for a single spindle unit based on calibration experiment. An industrial applicability of compensation models essentially depends on duration of calibration experiments and modelling effort to identify compensation model parameters. Therefore, the developed transfer function model is modified from the calibration effort point of view via multiplying original compensation model by a constant. Subsequently, model is applied on tests with other spindle units.

Název v anglickém jazyce

Real-time compensation of a 5-axis CNC milling centre thermal errors considering different spindle units

Popis výsledku anglicky

Thermal errors of machine tools are the main contributor to geometrical inaccuracies of machined workpieces. Successful reduction in thermal errors has been realized through thermal error compensation techniques in the past few decades. The effectiveness of thermal error models directly determines the compensation results. However, most of the current thermal error models are empirical and highly rely on the collected data under specific working conditions, neglecting the insight into the underlying mechanisms that result in thermal deformations. On the contrary, the transfer function based correction method lead to promising results as was shown in past studies. Furthermore, machine tools manufacturers frequently offer the same type of the machine tool equipped with different spindle units. Consequently, it leads to different thermal behaviour depending on the specific spindle unit mounted in the machine tool. The research presented in this paper shows a dynamic approach for thermal error compensation of 5-axis CNC milling centres considering different spindle units. Experimentally obtained thermal errors at the TCP from milling centres with 3 different mounted spindle units were mutually compared, showing a significant variation in thermal errors in the Z direction depending on the specific spindle unit. System identification theory is applied to build the dynamic thermal error model for a single spindle unit based on calibration experiment. An industrial applicability of compensation models essentially depends on duration of calibration experiments and modelling effort to identify compensation model parameters. Therefore, the developed transfer function model is modified from the calibration effort point of view via multiplying original compensation model by a constant. Subsequently, model is applied on tests with other spindle units.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20302 - Applied mechanics

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings of the 20th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2020

ISBN

9780995775176

ISSN

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e-ISSN

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Počet stran výsledku

4

Strana od-do

559-562

Název nakladatele

european society for precision engineering & nanotechnology

Místo vydání

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Místo konání akce

Geneva

Datum konání akce

8. 6. 2020

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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