Page 160 - Modular design for machine tools

120 Modular Design Guide and Machine Tools Description

Main spindle Tool Turret

Coordinates
C B (JIS B 6310)
A C
Y Z
X
B
Workpiece Y
X
Functional description
Z
CY / ZX / X
Direction of
rotating tool
axis
Flow of force Workpiece Base or Movements belonging
bed
to tool branch
Movements belonging
to main spindle branch
Figure 3-5 Functional description of turning center.

the proposed method to the production of the concept drawing [8] and
marketability analyses [9], as will be described in Chap. 4. In Saito and
Ito [8], the tool post structure and tool rotational axis can be compre-
hensively described because of the versatility of the tooling layout in the
TC, which is often very dominant for the expected application of the func-
tional description.
As can be readily seen, the functional description appears not to be
in direct relation to the modular design; however, it is actually a sup-
plementary design tool with the ease of use derived from its simplic-
ity. To further deepen one’s understanding, some marked issues will
be discussed in the following within the context of the historical point
of view.
In this context, we must touch on those researches carried out in
the U.S.S.R. so far. Actually, there have been a considerable number
of researches into the functional description following that of Vragov,
e.g., those of Aver’yanov, Portman, and Davydov. In Khomyakov and
Davydov [10], a new comprehensive description consisting of both the
machine and layout codes has been proposed on the basis of those of
Vragov and Ito and Shinno [11]. In short, the machine code may include
the information block (e.g., model and production year), technological
block (e.g., relating to drive ratings, range of spindle speeds, and range
of NC system indicators), common parameter block (e.g., cost, dimen-
sions, and weight), and the layout and unit blocks. Consequently, the
layout code can eminently represent the basic functional parts of the
layout, i.e., the load-carrying components of the machine, which is often