TPT January 2011

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January 2011 81 ›
Straightening & Finishing
TUBOTRON Srl, Argentina, has introduced
a new section with a special configuration
of four stands inclined 45°, two to one
side and the other two to the other of the
centreline of the tube mill. All are driven
passes and no idler passes are necessary
between the driven passes. Only a simple
turkshead is used for detwisting and
straightening purposes.
As all the rolls are driven, it is possible
to shape welded tubes up to the maximum
thickness allowed in the tube mill for
rounds, expanding the usual range of the
mill capabilities. It is also possible to size
round tubes. In each case (rounds, squares
and rectangulars), only eight rolls per size
are needed, instead of the usual 12 rolls
used in the most common configurations.
Additionally, shaping rectangulars and
squares can be performed using the
same tooling, designed as a combination
roll set.
Another advantage is having the sides
of squares and rectangulars in a vertical
or horizontal position. The welding line
S+C BOWERS & Jones, part of
Schmidt+Clemens Group, offers a full
range of high-precision roll products for
many applications from its manufacturing
plant in the UK. The complete in-house
service offered from the offices in the
UK and Germany includes extensive
technical advice on rolls, roll refurbishment,
manufacture of rolls to samples, and roll
design and development.
The cold straightening process can
be applied to many products, including
longitudinally welded or seamless tubes
and steel bars, sections and rails. The
rolls used in the straightening processes
must possess high hardness and wear
resistance characteristics, whilst offering
the lowest possible tendency to pick up.
Rolls manufactured from forged Märker®
cold work tool steels are suitable for these
applications.
To improve resistance to breaking rolls
of a one-piece design, made from pre-heat
treated Märker Zesek, the roll barrel can be
surface hardened in a special hardening
process (depth of hardness approximately
10 to 25mm), enabling rolls with a hard
wearing surface and tough core to be
produced.
New sizing, shaping and straightening section
for ERW tube mill
Premium performance rolls for straightening machines
remains in the centre of the upper side,
resulting in all corners of the shape having
the same radius and aspects.
A speciality of S+C Bowers & Jones
for smaller straightening rolls are through
hardened rolls with journals which have
been tempered back in order to achieve a
hard wearing roll barrel and tough journals.
For some applications, composite rolls
are offered as a two-part design. The working
part of the roll is a shell manufactured in
Märker Zesek fitted to a shaft made from
tough heat treatable steels.
Tubotron Srl – Argentina
Email:
Website:
S+C Bowers & Jones Ltd – UK
Fax: +44 1902 864654
Email:
Website:
International Sales Office – Germany
Fax: +49 2266 92 420
Website:
Machinery from Argentina’s Tubotron Srl
Straightening rolls manufactured from
S+C’s Märker Zesek tool steel