TPT March 2007

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Technology Update
34 March/April 2007
Kumz JSC, Russia, uses the hot extrusion
method and specialised presses with
5-120MN capacity to produce seamless
pipes from more than 80 aluminium alloys,
and diffused seam pipes from alloys
of 3xxx and 6xxx series. These semi-
finished pipes are supplied to industries
including automotive, chemical, oil and gas,
construction, engineering and shipbuilding.
Pipes from 12-100mm in diameter and
with 1.5mm to 10mm wall thickness are
produced on specialised horizontal hydraulic
presses with 5-35MN capacity using
mandrel dies. Presses with 15 and 25MN
capacity are equipped with spray units,
allowing quenching by means of
an aqua-air mix during extrusion.
This reduces production cycle
duration and power consumption.
A press with 35MN capacity is
used to produce seamless pipes
from 70-150mm in diameter and
5-30mm wall thickness, using
the indirect extrusion method.
This press is equipped with separate drive,
extrusion rate adjusting system and working
parameter monitoring system.
Pipe presses with 72MN capacity are
used for the extrusion of aluminium
alloy weldless pipes, with a diameter of
70-425mm and 5-90mm wall thickness.
These presses feature a reinforced piercing
system with a stroke limited by limit screws.
The system is attached to a moving beam,
providing the fixed position of the mandrel
and its exact movement to the specified
target position.
The piercing system capacity is added
to the main press capacity as required.
The piercing unit enables the extrusion
of weldless hollow sections with an inner
irregularly shaped hole. In addition, these
presses are used to extrude hollow sections
with a complicated outer shape, such as
the extrusion of electromotor housings from
alloy 1925.
Pipes with a diameter of 420-550mm with
walls of 10-110mm are produced on a
120MN capacity press. The quenching of
semi-finished pipe items is performed in
vertical and horizontal quenching units,
while box and shaft electrical furnaces with
furnace atmosphere forced circulation are
used for item ageing.
The company also has a production line
to produce aluminium drill and pump-
compression pipes. This line includes two
horizontal hydraulic presses with 72MN
capacity, designed for the production of
variable cross-section length-altered pipes.
Drill pipes are produced from alloys D16T,
1953T1, 2024T3 and 1570, and supplied in
the form of pipe shell, threaded pipe shell,
and drill pipes with locks screwed on. These
products are particularly useful for horizontal
drilling and ultra deep well drilling.
Kumz also produces pipes from 0.5m to
11m in length and 1-3mm wall thickness,
from alloys VD1, D1 and AK6. These pipes
include round cross-section (Ø 16-38mm),
square cross-section (16-25mm), and
rectangular cross-section (25mm x 28mm).
The company has its own foundry shop for
the production of solid and hollow cross-
section rounds, and a tool shop for the
production of extrusion tools. Products are
exported to over 20 countries, with main
markets being Europe, Middle East, North
Africa, South and Southeast Asia and the
CIS.
This article was supplied by Mr Dmitry Cheroskutov
(deputy chief extrusion industrial engineer) and
Ms Olga Degtyarev (industrial engineer), Kumz JSC.
Kumz – Russia
Fax: +7 3439 395 927
Website:
Heavy-duty mill simplifies
roll changeover and set up
Addison Machine Engineering Inc, USA, has launched an improved PSU-8000 rafted
sizing/powered squaring mill. The heavy-duty mill provides two features that simplify
changeover and setup and provide
greater operator safety.
The outboard roll stand base has a
built-in air bearing, making it possible
for one person to easily remove
the stand during roll changeover.
Additionally, the single point adjusters
on each roll simultaneously position
both front and rear side rolls and
individually position top and bottom
driven rolls.
All roll adjustments are made from
a safe, convenient access point on
the front of the stand, with a digital
position indicator providing precise roll
position feedback. This sizing/powered
squaring section is suitable for round tube diameters of 3" to 7.625", square tube up to
6" x 6", and rectangular tube up to 2" x 10".
Addison Machine Engineering Inc – USA
Fax: +1 608 524 6099 • Website:
› Addison Machine Engineering’s PSU-8000 rafted
sizing/powered squaring mill
Hot extruded pipes
from aluminium alloys
› Drill pipe from D16 alloy with locks screwed on
fi Horizontal hydraulic press with 72MN capacity
and separate piercing system