TPT September 2008

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September 2008 56
Technology Update
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Cold rolling mills for tube production from 6-450mm
Electrostal Heavy Engineering Works
(EZTM JSC), Russia, constructs cold rolling
tube mills of different configurations in order
to produce tubes from 6mm to 450mm in
diameter. The company designs machinery
for the production of tubes of small and
medium nominal sizes, including installation
of control systems and design of machines
to provide high reliability and control
flexibility under multiple stand strokes.
EZTM also develops three-high mills for
the rolling of tubes of medium and large
diameter. These mills are fitted with ring
or open-end ring passes and independent
drives of mechanisms that feed and turn the
billet, and are able to use different rolling
schemes. The company also carries out
modernisation of existing cold rolling mills,
from separate units up to full redesign.
A new universal cold pilger mill 60-160
has been put into operation by EZTM
JSC in India. The mill is intended for the
production of extremely thin-walled tubes
of cylindrical, hexagonal or square section.
High technological mobility is achieved by
using several technological rolling schemes.
These include rolling with
double feed and double turn,
rolling at forward stroke of the
working stand, and rolling with
feed and turn in the extreme
back position of the working
stand only.
The mill is equipped with three
different interchangeable
working stands allowing
four types of rolling to be
performed. The mill enables
rolling of cylindrical tubes
in a three-high stand with
passes having grooves of either a constant
or variable section. The second option is
rolling of hexagonal tubes in a three-high
stand with passes having grooves of a
constant section. The third capability is for
rolling of square tubes in a four-roller stand
with passes having grooves of constant
section. It is therefore possible to produce
fine pre-finished billets for the subsequent
rolling of high-precision shaped tubes.
EZTM JSC has also manufactured a
unique cold rolling mill 350 for a Chinese
customer. The mill is intended for the
rolling of different stainless steels.
Distinguishing features of the mill 350 are
three-high stand with roll force up to 800
ton, independent drives of mechanisms
that feed and turn the billet, and a drive
system allowing the adjustment of the
desired roll diameter and roll with minimum
axial forces.
EZTM JSC – Russia
Fax: +7 496 577 7304
Website:
 A 3-high rolling stand from EZTM