Device for Supplying the Hydrostatic Pockets with Compensation of the Fluid Temperature

Abstract:

The supply devices of the hydrostatic guideway pockets are elements with a major influence on the rigidity of the machine tool guideways. The value of the flow that circulates through these devices depends on the fluid viscosity as well. The researches in this field show that an important increase of the fluid temperature is produced when it passes through various orifices, slits and interstices that belong to the hydrostatic systems. The increase of the working temperature leads to decreasing the kinematic viscosity, with undesirable effects on the functioning of the hydrostatic guideways. In order to minimize this disadvantage, this work is presenting a constructive solution of a fixed supply device (flow control valve) with fluid temperature compensation. This type of device avoids the negative effects of increased fluid viscosity caused by the temperature increase as well, by automatically modifying the flowing cross section that is performed through a compensation bushing. The constructive solution of the new supply device is simple and involves relative low workmanship and costs. This supply device has been experimented on a rotary table model MRD 1500x2000, on the linear axis of 2200 mm travel. Through the comparative analyses of the new solution versus the standard one that was using as supply device a capillary type resistor, an increase of the guideway rigidity by 13% has resulted.

• Periodical: Applied Mechanics and Materials (Volume 371)
• Pages: 632-636
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.371.632
• Online since: August 2013
• Authors: Marius Pascu, Gheorghe Stan, Claudiu Obreja, Dragoș Andrioaia
• Keywords: Accuracy, Flow, Guideway, Pockets, Rigidity, Temperature, Viscosity

References

[1] E. Shamoto, T. Moriwaki, Analysis and improvement of motion accuracy of hydrostatic feed table, CIRP Annals-Manufacturing Technology. 50 (1) (2001) 285-290.

DOI: 10.1016/s0007-8506(07)62123-4

[2] C. H Park et al., Compensation for five DOF motion errors of hydrostatic feed table by utilizing actively controlled capillaried, Precision Engineering. 30(3) (2006) 299-305.

DOI: 10.1016/j.precisioneng.2005.10.002

[3] C. Brencher et al, Compact design for high precision machine tools, International Journal of Machine Tools and Manufacture. 50 (4) (2010) 328-334.

DOI: 10.1016/j.ijmachtools.2009.11.007

[4] S. Mekid, High precision liniar slide. Part I: design and construction, International Journal of Machine Tool and Manufacture. 40 (7) (2011) 1039-1050.

DOI: 10.1016/s0890-6955(99)00109-1

[5] T. Ekinci, J. Mayer, Relationships between straightness and angular kinematic errors in machines, International Journal of Machine Tools and Manufacture. 47(12-13) (2007) 1997-(2004).

DOI: 10.1016/j.ijmachtools.2007.02.002

[6] X. Xiaoqiu, S. Junpeng, W. Yunfei, Research on influence of return oil groove width on temperature field of hydrostatic thrust bearing with multiple oil pads 23(5) (2009) 940-943.

DOI: 10.1109/emeit.2011.6023249

[7] M. Fillon, J. Bouyer, Thermohydrodynamic analysis of a worn plain journal bearing, Tribology International. 37(12) (2004) 129-136.

DOI: 10.1016/s0301-679x(03)00051-3

[8] Z. Yanqin, Q. Xiao, Analysis on influence of oil film thickness on temperature field of heavy hydrostatic bearing in variable viscosity condition, Advanced Materials Research. (AMR) (239) (2011) 1418-1421.

DOI: 10.4028/www.scientific.net/amr.239-242.1418

[9] W. Hunter, O. Zienkiewicz, Effect of temperature variations across the lubricant films in the theory of hydrodynamic lubrication, Journal of Mechanical Engineering Science. 2 (2007) 52-58.

DOI: 10.1243/jmes_jour_1960_002_009_02