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7311 Thrust Bearings
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As aerostatic journal bearings are poor in taking up an axial load, there is a need for aerostatic thrust bearings This is more so for the grinding spindle where the axial stiffness is extremely crucial The practical and theoretical performances are usually different due to the underlying assumption that the pressure distribution is incompressible Aerostatic thrust bearings are more prone to a self-exciting instability and consume relatively more airflow [3] Several rules must be observed to avoid instability or an air hammer in the thrust bearing:
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Precision Engineering
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Fig 756: The sketch of the final design for slot feeding
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Table 75
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Comparison of a simple orifice and slot feeding for aerostatic journal bearings
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Requirement Simple orifice 2 in (508 mm) 3 in (762 mm) 0001 in (254 m) Two rows of eight simple orifices at the quarter station Diameter of the feed hole = 50 10 3 in (127 m) Slot feeding 2 in (508 mm) 3 in (762 mm) 0001 in (254 m) Two rows of six circumferential slots at the one-eighth station Thickness of the bushing = 075 in (1905 m) Width of slot = 23 10 4 in (584 m) 110 lbf (48950 N) (at e = 05) 440 000 lbf/in (77,000 N/mm) (0 < e < 05) 030 scfm (850 l/min)
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Diameter Length Diametrical Clearance Feeding
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2 in (508 mm)
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Maximum Load Capacity Maximum Radial Stiffness Airflow
100 lbf (445 N) 400,000 lbf/in (70,000 N/mm) 050 scfm (2832 l/min)
107 lbf (47715 N) (at e = 05) 428 000 lbf/in (74,900 N/mm) (0 < e < 05) 035 scfm (991 l/min)
Gas Lubricated Bearings
For annular thrust bearings, the ratio of the outside to the inside diameter must be kept as large as possible The volume of the pockets and grooves must be kept to a minimum by limiting the depth and the width Instead of pockets, grooves can be used to outline the desired pocket area When two thrust bearings are employed, they should be loaded against each other and choked feed holes must be avoided at all times The gas can be exhausted through a single hole or through a throttling orifice to prevent instability Figure 757 indicates the possible groove arrangement for an aerostatic thrust bearing The simplest form of circular thrust bearings with a central feed hole and a pocket is by far the most economical and it Fig 757: Grooved annular thrust bearings [3] provides for a higher load capacity and stiffness at a 20% lower airflow compared to an annular thrust bearing of the same outside diameter (Figure 758) However, this particular type of air bearing cannot be used with protruding shafts
Fig 758: Central feed and pocket aerostatic thrust bearings [1]
Precision Engineering
The design procedure for an aerostatic thrust bearing is quite similar to that of the aerostatic journal bearing The design of the aerostatic thrust bearings requires a compromise between the conflicting demands of performance, the available gas supply and the manufacturing capability The load capacity, stiffness and gas flow can be estimated by reference to Figure 761 and Figure 762 The data are presented for a supply pressure gauge of 100 lbf/in2 and atmospheric exhaust conditions The standard clearance of 00005 in is the same as that for the journal bearings For Figure 761 and 762, the load capacity is given at the point of maximum stiffness (Kg = 069) Example: Design of Thrust Bearing Two thrust bearings are used to provide the ability to carry load in both directions The thrust bearings support the grinding spindle of a machine The parameters are introduced as follows: Thrust Load = 120 lbf 534 N Axial Stiffness = 800 000 lbf/in 140 000 N/mm 517 kPa Air Supply Pressure = 75 lbf/in2 Airflow = 065 scfm 00184 m3/min Outer Diameter = 3 in 762 mm Central Hole Diameter = 1 in 254 mm Figure 759 shows the aerostatic work and grinding spindles of a Toshiba ultra-precision grinding machine Both the spindles require thrust bearings, as aerostatic journal bearings are not capable of
Fig 759: A Toshiba ultra-precision grinding machine [26]
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