TPT May 2012

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May 2012 123
Article
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
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:
Website:
Rapid roll change mill with base plate change by FD Machinery
CFS mill of Ø200×200 Ø500×500mm by FD Machinery