plaquette MACHLINE - Ntn-snr.com

Spindle design:
simulations
Design software
SNR's R&D department has developed design software for use in optimizing and checking spindle bearing
dimensions. This software gives a fuller and more accurate simulation than the simplified or corrected
methods. It provides a means to model the spindle and its bearings and to properly take load, rotation
speed and lubrication into account. The software simulates the equilibrium state of a spindle rotating on
bearings and subject to external loads.
• It determines:
- loads and the deflection at the contact between
balls and rings,
- loads applied to each bearing,
- displacement of inner and outer rings,
- shaft deformation,
- axial and radial rigidity at the selected reference
point.
• It calculates:
- the pressure values and dimensions of the
elliptical contact surfaces,
- the service life L 10 of the bearings, based on the
contact capacity,
- the thickness of the lubricant film (the service
life is adjusted in the event of insufficient film
thickness).
Radius R (mm)
Graphic display
of input data
and SNR results
80
60
40
20
0
-20
-40
-60
Shaft modelling
-80
-50 0 250
50 100 150 200 300 350 400 450 500
X axis (mm)
Bearing center points
Load application points
-50 -25 0 25 50 75 100 125 150 175 200 225 250 275 300 325 350 375 400 425 450 475
X axis
Representation
of shaft
deformation
0.010
0.008
0.006
0.004
0.002
0.000
-0.002
-0.004
-0.006
-0.008
Displacement Y
Projection
of non-deformed
shaft onto XOY AND XOZ
Projection of deformed
shaft onto XOY and XOZ
Displacements
-50 -25 0 25 50 75 100 125 150 175 200 225 250 275 300 325 350 375 400 425 450 475
X axis
SNR is at your service to check and
optimize the bearings in your spindles
on the basis of your specifications.
-0.010
-0.008
-0.006
-0.004
-0.002
0.000
0.002
0.004
0.006
0.008
0.010
Displacement Z
3D representation
of deformed shaft
Original shaft
and bearing position
24