TPT January 2011

S traightening & F inishing

New sizing, shaping and straightening section for ERW tube mill

Tubotron Srl – Argentina Email: tubotron@gmail.com Website: www.tubefirst.com

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.

remains in the centre of the upper side, resulting in all corners of the shape having the same radius and aspects.

Machinery from Argentina’s Tubotron Srl

Premium performance rolls for straightening machines

S+C Bowers & Jones Ltd – UK Fax: +44 1902 864654 Email: sales@bowersjones.co.uk Website: www.bowersjones.com International Sales Office – Germany Fax: +49 2266 92 420 Website: www.schmidt-clemens.com

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.

Straightening rolls manufactured from S+C’s Märker Zesek tool steel

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J anuary 2011

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