TUBE EXPANDERS AND EQUIPMENT FOR TUBE EXPANDING
COMPRESSED AIR EXPANDER FOR CONTROLLED EXPANDING
The compressed air expander Mod. "MACS0012K"is a reversible
machine with spring type couple control.
of twisting is obtained by appropriately charging the spring placed inside
the machine. A silencer, placed on the handle, diminishes the noise of the
It is normally supplied with a squared hole bush for normal coupling to
may be supplied with autocentering bush for cylindrical type mandrels.
TUBE EXPANDERS TYPE BN
series with adjustable thrustblock catch
tube expanders BN type have the thrustblock catch rotating on rollers and
adjustable to regulate the expansion depth within the limits permitted
by the threaded part of the cage.
This type of expander, starting from size 6, is also applied in 1 - 2 - 3
types where the lenght of the threaded par4 with respect to the BN type, is
increased respectively of 100 200 - 300 mm.
example: expander size 201BN:
expansion mm. 15 17, expanding depth regulation from 15 to 30 mm.;
expansion mm. 15 - 17, expanding depth regulation from 15 to 100 mm.;
expansion mm. 15 - 17, expanding depth regulation from 15 to 200 mm.;
expansion mm. 15 - 17, expanding depth regulation from 15 to 300 mm.
expanders 1 - 2 - 3 type
are used for depth expanding or multi-round expanding tube plate of notable
in multi-round expanding, for a perfect execution, it is important to
advance (or to back) the thrustblock catch in order to have overlapping
between two successive expansions.
is usual among constructors to call first and second plate respectively the inlet
side and outlet side of a tube nackage.
On the first plate (inlet side) the tubes overhang about 2 - 3 mm.
while on the second plate (outlet side) the expanded tubes
overhanging varies according to the cut tolerance of the tubes themselves
and to the lengthening due the expanding.
As a consequence of what said above the support bush of the
thrustblock catch of these expanders is of 3 types:
for support on tube ends (normally for tubes on the edge of plates)
- bush with 2 mm. shallow cavity
in order to have a uniform overhang of the tubes on the first plate
- bush with prolonged shallow cavity
to accomodate the overhanging tubes of the second plate
Our technical dept, is at your disposal for any
suggestion dealing with choice and use you should need; and also to examine
with you any problem dealing with particular needs of expanding, by building
the adequate expanders.
TUBE EXPANDERS TYPE BNS SPECIAL SERIES
Type BNS with
adjustable reach and rolls length by request
TUBE EXPANDERS TYPE A NORMAL SERIES
A for rolling and flaring in one operation
tube expanders type "BNS" is similar to type "BN" normal
series but it is built with rolls and cage lenght by request. It is used for
thiek tube-sheets or depth rolling reason waterwalls or baffle plates. These
tube expanders are built according to customer requirements.
SPECIAL LUBRIFICANT FOR EXPANDING
the operation of expanding because of moving parts (mandrels and rolls) and
of tubes deformation, friction and heat are released.
friction and heat, means increasing duration of material and use less power.
experiments carried out by our customers we f see the choise between two
products "PM1" and "PM2 which are best in our specific
is liquid and available in 1 and 3 litres versions. It is used pure or
diluted with water according to difficulty o conditions of expanders
The main feature of this lubrifier is that of being easily eliminated from
inside tubes by simple water washing.
IT DOES NOT ROT, DOES NOT GIVE OFF FUMES DURING USE,
PROTECTS FROM RUST
is a paste and available in 1 Kg. Version.
Even though it has the same features as PM2
it is not hydrosoluble