Study on the Stiffness, Longevity and Reliability of the Spindle Unit of Eclipse 300 CNC Lathe with Different External Load
Main Article Content
Abstract
The stiffness of the spindle assembly of machine tools in general and also CNC machines in particular is an important criteria to evaluate the quality of machining. The initial stiffness of the spindle assembly is due to pre-load. During operating, the spindle assembly is wear under the influence of external loads including cutting force and speed. It reduces the stiffness of the spindle assembly, as well as decreasing machining accuracy. This study presents the results of various stiffness of the spindle assembly under external loads in laboratory conditions. Based on the relationship between the stiffness and the amount of axial wear of the spindle assembly according to the working time, as well as the permissible stiffness limit to predict remaining time, reliability and time of adjusting the pre-load to maintain stability and machining accuracy.
Keywords
Spindle unit of CNC machine, Stiffness of CNC machine tool spindle, wear of bearing, longevity, reliability
Article Details
References
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[11] Eclipse machine Catalog, Alecop, 2010.
[2] Momir Šarenac, Stiffness of machine tool spindle as a main factor for treatment accuracy, The scientific journal Facta Universitatis, vol.1, no.6, pp. 656-674, 1999.
[3] Tri Prakosa and Rizky Ilhamsyah Agung Wibowo, Optimizing static and dynamic stiffness of machine tools spindle shaft, for improving machining product quality, Journal of KONES Powertrain and Transport, vol. 20, no 4, pp 363-370, 2013.
[4] Holroyd, Pislaru, Crinela and Ford, Derek G Geoffrey, Determination of stiffness and damping sensitivity for computer numerically controlled machine tool drives, Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, vol. 217, no. 1, pp.1165–1177, 2003, https://doi.org/10.1243/095440603322517171.
[5] Rastegari. A and Mobin. M Archenti. A, Condition Based Maintenance of Machine Tools: Vibration Monitoring of Spindle Units, Annual Reliability and Maintainability Symposium, Orlando, FL, USA, 2017 https://doi.org/10.1109/RAM.2017.7889683
[6] Nguyễn Anh Tuấn, Phạm Văn Hùng, Ma sát học, NXB khoa học & kỹ thuật, 2005.
[7] I.V.Kragelsky at al, Friction wear lubrication, Pulisher, 1981.
[8] Test conditions for numerically controlled turning machines and turning centres in Part 1: Geometric tests for machines with a horizontal workholding spindle, ISO13041-1, 2004.
[9] Machine tool spindle bearing selection & mounting guide, NSK, 2012.
[10] M.M. Khonsari, E.R. Booser. Bearing Design and Lubrication, John Wiley and Sons, 2001.
[11] Eclipse machine Catalog, Alecop, 2010.