The structural principle and dynamic working condition of the dynamic
bearing sliding bearing of the machine tool are analyzed, and the
dynamic characteristic parameters of the dynamic pressure sliding
bearing are deduced by Taylor. The stability of the two symmetrical
spindle systems is analyzed and calculated.
The
development of modern manufacturing technology on the machine cutting
speed and accuracy requirements are getting higher and higher. To
adapt to high-speed rotating spindle dynamic sliding bearings, dynamic
performance of a greater impact, first, dynamic sliding bearings on the
spindle system to provide adequate damping to ensure stable operation of
the spindle; Second, the bearing elasticity of the spindle to the
actual critical speed than the rolling bearing , And produce cross stiffness is one of the main factors that contribute to the system instability. Therefore, the dynamic performance analysis of dynamic pressure
sliding bearings, the design of a good dynamic performance of the
machine tool spindle system is very necessary.
Structural Principle of Dynamic Spherical Plain Bearings for Machine Tool Spindle
Dynamic pressure sliding bearings according to different lubricants,
divided into liquid dynamic sliding bearings and gas dynamic pressure
sliding bearings, machine tool spindle is commonly used in more oil
wedge liquid dynamic pressure sliding bearings.
The
dynamic pressure sliding bearing is rotated by the spindle at a
sufficiently high angular velocity ω, and the lubricant of a certain
viscosity is brought into the convergent multi-oil wedge to form the
pressure oil film to bear the load. Oil
film thickness depends on the shape of the oil wedge, the oil wedge
shape is formed in the inner wall of the bearing curve of the oil tank,
fixed tile with Archimedes curve oil tank, eccentric arc arc curve
groove, movable tile flexion point B swing can automatically adjust the
gap, The lubricating agent flows in the convergent wedge-shaped gap, and
due to the shear stress between the oil layers, the fluid power is
generated, so that the two surfaces of the relative movement are
separated by the oil film to form pure liquid friction.
The
dynamic pressure sliding bearing has the characteristics of simple
structure, smooth operation, good anti-vibration damping, low noise,
large strength and rigidity of the spindle system, high bearing
reliability and bearing capacity. So dynamic pressure sliding bearings are widely used in machine tool spindle and other industry machinery and equipment.
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