Mitsubishi Heavy Industries, Ltd.
Technical Review Vol.39 No.3 (Oct. 2002)
New Model Mitsubishi Plano-
Machining Center M-VS-B
Machining centers with higher mechanical rigidity and
higher productivity and with much importance given on
heavy-duty machining performance are demanded for
machining medium and large size parts for power system
equipment etc. In order to meet with these needs of
customers, the new model Mitsubishi Plano-Machining
Center M-VS-B has been developed by pursuing
improvements in heavy-duty machining capacity and
speed and by making remarkable improvements in side-
face machining capacity as an outstanding five-face
The outline of the newly developed machining center
is described below.
The appearance of the machining center is shown in
Fig. 1 and the specification is given in Table 1.
2.1 Enhanced heavy-duty machining capacity
through improved main-spindle power and
improved rigidity (stiffness) of each unit
The main-spindle power is improved to 30 kW from
the conventional 22 kW, and the rigidity of the machine
itself is also correspondingly improved. The headstock
has the distance between two guide rails of the Y -axis
roller guideway expanded, with the bed and crossrail
sections enlarged to double the independent r igidity.
Further, roller guides are adopted as the linear guides
for all shafts, ensuring more than double roller guided
rigidity than the conventional machining center.
2.2 Correspondence to new machining
technology through high-speed and high-
rigidity main spindle
The mounted 30 kW main spindle with high rigidity
and high speed realizes a high speed rotation of 6 000
min-1 in spite of the adoption of highly rigid cylindrical
roller bearings with 110 mm in diameter.
Further, the clamping power is drastically improved
from 2 t to 8 t by pulling strongly using 4 clamping knobs
instead of using the conventional tool clamping
mechanism fo r lateral main spindle attachment
clamping. This has improved the main spindle