Page 244 - Modular design for machine tools

204 Engineering Design for Machine Tool Joints

28
mm n = 2500 rpm
24
Fullsize
Model
20
n = 2000 rpm
16
n = 1000 rpm
∆Z/λ l 12
∆Z, Z
8 Z
H
4
Fundament
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1
a ·t
l
Fourier number F =
0
H 2
Length scale factor λ = 0.667
l
t: Time
a : Thermal conductance
λ
Figure 5-23 Model testing for thermal deformation of main spindle (by Schossig).
5.5 Firsthand View of Research History
The aims and scope of this book lie primarily in the technological aspect;
however, knowledge of the history of the research work is somewhat
helpful to reinforce the rudimentary knowledge about the machine tool
joint. In this section, thus, a firsthand view of research works will be
given by emphasizing those from embryonic to first fruition stages before
1975, in the mid-1980s, and in the 1990s. In addition, certain future per-
spectives will be touched on when necessary.

Research history before 1975. It is very difficult to exactly determine
when the first research and engineering work commenced and who con-
ducted them. This is a general rule in the engineering sphere, because
each engineering topic is, more or less, subjected to a certain technolog-
ical inheritance from its predecessors. Despite having such difficulties,
Drs. Reshetov and Levina could be credited as the initiators, who explic-
itly suggested the important role of the joint within the body structure,
when realizing the required dimensional and performance specifications
of a machine tool from the engineering viewpoint. After carrying out long-
standing research, they suggested the necessity of incorporating the joint
characteristics into the structural design of the machine tool [24].