Design and Test Rig Experiments of a High Speed Tapered Roller Bearing for Main Spindle Applications

Brecher, Christian; Fey, Marcel; Bartelt, Andreas; Hassis, Alexander

doi:10.1016/j.procir.2016.04.053

Cited by 11 publications

(5 citation statements)

References 7 publications

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“…Furthermore, a TRB with enlarged rollers and cage diameter to increase the bearing stiffness for automotive applications was presented in [6]. Moreover, a hybrid TRB with lubricated rib on the outer ring was developed and successfully tested up to a speed parameter of 1 × 10 6 mm/min [7]. Another approach based on a geometrical optimisation of the TRB with smaller rollers did not improve the speed capability [1].…”

Section: Introductionmentioning

confidence: 99%

Stiffness increase in main spindles by using tapered roller bearings for aluminum cutting tests

Gärtner,

Brecher,

Neus

et al. 2024

Prod. Eng. Res. Devel.

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Due to increasing demands regarding higher manufacturing accuracy and the machining of high-strength materials, the stiffness and load-carrying capacity of main spindles must be enhanced. One approach is to replace the conventionally used angular contact ball bearings, so called spindle bearings, with tapered roller bearings of the same size, which have a higher stiffness and load carrying capacity due to their larger rolling contact. In case the speed requirement is below a speed parameter $$n\cdot d_{m}=0.9\times 10^{6}$$ n · d m = 0.9 × 10 6 mm/min, the poorer speed parameter of tapered roller bearings can be compensated by a sufficiently high lubrication quantity. However, the stiffness increase by using this bearing type in main spindles has not yet been quantified in field tests. Therefore, the aim of this paper is to demonstrate the stiffness advantage of a spindle with an elastically arranged tapered roller bearing compared to a conventional spindle with angular contact ball bearings by machining tests. First, the radial load displacement characteristic of the newly developed tapered roller bearing spindle is tested in advance on an isolated test rig. In machine cutting tests, full slots are milled in an aluminum block. During the tests, the axial and radial displacements of the spindle shaft relative to the housing are measured and evaluated in radial and axial direction. These tests are repeated and compared with the conventional spindle. By varying the process parameters such as cutting depth, feed rate or rotational speed, the increased stiffness of the tapered roller bearing spindle compared to the conventional spindle is illustrated based on the measured displacements. Moreover, frequency response measurements at different speeds underpin the improved damping of the tapered roller bearing spindle. Assuming that the speed requirements are not too high and the tapered roller bearing is sufficiently lubricated, the use of this type of bearing can significantly increase the stiffness and thus the manufacturing precision in the long term for main spindles.

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Section: Introductionmentioning

confidence: 99%

Stiffness increase in main spindles by using tapered roller bearings for aluminum cutting tests

Gärtner,

Brecher,

Neus

et al. 2024

Prod. Eng. Res. Devel.

Self Cite

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“…Das Lager zeichnet sich durch einen Öl-Luft-geschmierten Außenringbord aus, zudem bestehen die Rollen aus Siliziumnitrid zur Verbesserung der Reibeigenschaften des KR. Ein vergleichbares Lager, das ähnliche Drehzahlkennwerte erreicht, wird in [6] validiert.…”

Section: Introductionunclassified

Erhöhte Prozessstabilität durch Kegelrollenlager/Increased process stability due to tapered roller bearings

Gärtner,

Klimaschka,

Brecher

et al. 2024

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“…Furthermore, a high-speed tapered roller bearing with an axial moveable and hydraulically preloaded rib was developed to achieve a comparable high speed limit [3,4]. Another precision hybrid tapered roller bearing with a direct lubricated rib-roller contact on the outer ring was successfully tested for a speed parameter up to 1•10 6 mm/min in [5]. A further development of the bearing by mathematical optimization of the rib geometries, however, did not result in an improvement of the speed limits [6].…”

Section: Introductionmentioning

confidence: 99%

Lubrication of Radial Loaded Tapered Roller Bearings Under High Rotational Speeds

Gärtner¹,

Brecher²,

Neus³

et al. 2023

Tribol. Ind.

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To improve the manufacturing accuracy in the machining process, the stiffness of the machine tool spindle must be increased. One approach is to replace the conventionally used spindle bearings by tapered roller bearings to achieve a higher stiffness and load carrying capacity. However, the speed capability of this bearing type is limited, though can be enhanced by sufficient lubrication, especially in the critically loaded rib-roller-contact. The objective of this paper is to validate the lubricant influence on the speed capability of radially loaded tapered roller bearings. In various speed step runs, the operating behavior of the bearings under oil-air and grease lubrication was evaluated based on the outer ring temperature and the vibration level in the test rig. With oil-air lubrication, a speed parameter up to 900,000 mm/min could be achieved, whereas with grease lubrication, a speed parameter of 540,000 mm/min could be reached. In comparison, the setup with spindle bearings can achieve the highest investigated speed parameter of 900,000 mm/min with both grease and oil-air lubrication. For grease lubricated ball bearings, significantly higher temperature fluctuations are present with variation of the radial load. In the case of oil-air lubrication, the steady-state temperature improved with increasing oil viscosity.

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Design and Test Rig Experiments of a High Speed Tapered Roller Bearing for Main Spindle Applications

Cited by 11 publications

References 7 publications

Stiffness increase in main spindles by using tapered roller bearings for aluminum cutting tests

Stiffness increase in main spindles by using tapered roller bearings for aluminum cutting tests

Erhöhte Prozessstabilität durch Kegelrollenlager/Increased process stability due to tapered roller bearings

Lubrication of Radial Loaded Tapered Roller Bearings Under High Rotational Speeds

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