Precise model of HSC Machining Centre for aerospace parts machining

• Autorzy: Jedrzejewski J. , Kwasny W. , Kowal Z. , Modrzycki W.
• Języki publikacji: EN

Abstrakty

EN

This article shows the aspects of precise modelling of precise High-speed Machining Centres for High-Speed Cutting (HSC) of parts used in the aerospace industry. The main focus was made on the thermal errors having a dominant influence on the precision of machining. Main assumptions for a hybrid thermal model of a centre thermal behaviour have been stated, taking into account the characteristics of heat sources. On the example of a 3-axis machining centre, measured runs of heating up and heat displacements have been shown, compared to these determined with the use of simulations of a behaviour in assumed working conditions. A special attention was drawn to the phenomena taking place in motorspindles, as well as to the displacements of a spindle face during high rotational speeds of spindles and step changes of rotational speeds. The significance and influence of the bearing preload and centrifugal forces on the spindle axial displacements was shown, which is decisive on the precision of part machining. Additionally, it was shown that the important component of a machining error is an error of spindle position identification by means of a linear encoder, resulting from the thermal deformation of a centre body, to which a quartz linear encoder is fixed.

Słowa kluczowe

EN

machining centre; model; aerospace; precision

• Wydawca: Wydawnictwo Wrocławskiej Rady FSNT NOT
• Czasopismo: Journal of Machine Engineering
• Rocznik: 2008
• Tom: Vol. 8, No. 3
• Strony: 29--41
• Opis fizyczny: Bibliogr. 10 poz., rys.

Twórcy

autor

Jedrzejewski J.

• Institute of Production Engineering and Automation, Wroclaw University of Technology, Wroclaw, Poland

autor

Kwasny W.

• Institute of Production Engineering and Automation, Wroclaw University of Technology, Wroclaw, Poland

autor

Kowal Z.

• Institute of Production Engineering and Automation, Wroclaw University of Technology, Wroclaw, Poland

autor

Modrzycki W.

• Institute of Production Engineering and Automation, Wroclaw University of Technology, Wroclaw, Poland

Bibliografia

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• [2] JEDRZEJEWSKI J., KOWAL Z., KWAŚNY W., MODRZYCKI W., Hybrid Model of High Speed machining Centre Headstock, Annals of the CIRP, 2004, 53/1, 285-288.
• [3] MORIWAKI T., SHAMOTO E., Analysis of thermal deformations of an ultraprecision air spindle system. Annals of the CIRP 47/1, 1998, 315-319.
• [4] WINIARSKI Z. KOWAL Z.. Investigation of the effects of heat generation in HSM electro headstocks. Journal of Machine Engineering, 2006, 6/2, 107-115.
• [5] JEDRZEJEWSKI J., Effect of the Thermal Contact Resistance on the Thermal Behaviour of the Spindle Radial Bearings, International Journal Machine Tools Manufacturing, 1988, 28/4, 409-416.
• [6] JEDRZEJEWSKI J., KWAŚNY W., KOWAL Z., MODRZYCKI W., Operational behaviour of high speed spindle unit, MM Science Journal, October 2008, 3, 40-43.
• [7] WECK M., SPACHTHOLZ G., 3- and 4-Contact Point Spindle Bearing - A New Approach for High Speed Spindle Systems. Annals of the CIRP, 2003, 52/1, 311-316.
• [8] JEDRZEJEWSKI J., KWAŚNY W., MODRZYCKI W., Limiting precision distortions in spindle unit of HSC machining centre. Journal of Machine Engineering, 2008, 8/1, 44-53.
• [9] CHEN J.-S., HWANG Y.-W., Centrifugal force induced dynamics of a motorized high-speed spindle, Int J Adv Manuf Technol, 2006, 30, 10-19.
• [10] JEDRZEJEWSKI J., KOWAL Z., KWAŚNY W., WINIARSKI Z., Precise modelling of HSC machine tool thermal behaviour, Journal of Achievements in Materials and Manufacturing Engineering, 2007, 24/1, 245-252.