Page 231 - Modular design for machine tools

Basic Knowledge of Machine Tool Joints 191

λ: Joint deflection
R : Total amount of surface roughness
T
2.0 in contact

Cast iron, ground (by Dolbey)
λ/R T Cast iron, lapped Cast iron, periferal ground
1.0 (by Ostrovskii)

Z = 12–15 Cast iron, scraped (by Levina)
Z = 20–25
Z: Numbers of spots per any 1 in 2

0 10 20 30
Interface pressure p, kgf/cm 2
(b)
Figure 5-13 (Continued)

by the deflection of surface roughness and in part deformation of the
surface layer of the body. The slideway showing local deformation in
its operating condition falls into this category.
3. The region denoted by a, b, and c corresponds to the bolted joint,
because its interface pressure is higher than that of other joints, and
the local deformation of the structural body itself, e.g., warping or
bedding in the body, is liable to appear.

Upper elastic body c

Disturbed zone of shear stress flow due to the joint b a

b

Lower elastic body c
Replaced spring
in the model for
computation
Figure 5-14 The concept of region of joint.