TPT May 2012

A rticle

Although there are a large number of rolls, they are of low purchasing and maintenance costs due to a lighter weight of rolls, so the roll cost distributed into the cost is low. The square/rectangular tube mills can be made without roll change. There are many more product specifications of square/ rectangular tubes (including the section area, length, wall thickness) than those of the round tubes, the specifications are more frequently changed, which takes more time. Then, the performance advantage for no roll change is quite remarkable. Olimpia 80 Tube Mills Machinery and FD Machinery are manufacturing this kind of no roll change square and rectangular tube mills. The AUTO-DNSA mill was developed by FD Machinery in 2011 on the basis of DNSA technology. AUTO-DNSA refers to the DNSA mill with automatic roll change and automatic adjustment. FD has signed the first supply contract with a Taiwan large steel tube company and the mill will be put into operation in June 2012. The basics of the AUTO-DNSA mill are from DNSA, which is an upgrade on the manual automation of the DNSA mill. Like the DNSA mill, the AUTO-DNSA mill has higher requirements on the equipment precision and rigidity compared with normal mills. The differences are that in DNSA mills, the tables are used to adjust the rolls manually and the roll changes are done mechanically. For the AUTO-DNSA mill, the automatic roll change is done via programs for automatic adjustment. The roll change (including

Rapid roll change mill with base plate change by FD Machinery

CFS mill of Ø200×200 Ø500×500mm by FD Machinery

adjustment) takes less than an hour. When the equipment is running, the operator can adjust the equipment any time without any need of switch. The characteristics of the digitalisation, automation and humanisation of AUTO-DNSA mill seem to make us see future tube welding plants, where people in white shirts sit in the control rooms at constant temperature far away from the noise, sending out various production commands to each production line. Only the suppliers are on the field to unload the steel coils continuously to the specified locations, and the buyers are busy picking up their steel tubes. One or two operators are responsible for changing the blades, saw bits, induction coils and impeders or deal with some minor troubles for all the mills. It does not cost much to have all this achieved. The AUTO-DNSA mill will become the perfect ERW mill in the world, if it can be turned to a reality.

FD Machinery Co Ltd – China Fax: +86 411 83192716 Email: fd@fdmachinery.com Website: www.fdmachinery.com

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M ay 2012