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Патент USA US3054172

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Sept. 18, 1962
R. J. AMTMANN
3,054,162
METHOD AND APPARATUS FOR DESCALING STRIP
MATERIAL, ESPECIALLY STRIP IRON
Filed Feb. 17, 195s
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Sept. 18, 1962
3,054,162
R. J. AMTMANN
METHOD AND APPARATUS FOR DESCALING STRIP
MATERIAL, ESPECIALLY STRIP IRON
6 Sheets-Sheet 2
Filed Feb. 17, 1958
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Sept. 18, 1962
R .1. AMTMANN
MATERIAL, ESPECIALLY STRIP IRON
Filed Feb. 17, 1958
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3,054,162
METHOD AND APFARATUS FOR DESCALING STRIP
6 Sheets-Sheet 3
Sept. 18, 1962
R. J. AMTMANN
METHOD
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Filed Feb. 17, 1958
MAT
D APPARA TUS FOR DESCALING STRIP
AL, ESP ECIALLY STRIP IRON
3,054,162
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Sept. 18, 1962
R. _1. AMTMANN
3,054,162
METHOD AND APPARATUS FOR DESCALING STRIP
MATERIAL, ESPECIALLY STRIP IRON
Filed Feb. 1'?. 1958
6 Sheets-Sheet 5
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Sepf- 18, 1962
R. J. AMTMANN
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3,054,162
DEscAL ING STRIP
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METHOD AND APPARATUS F
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Patented Sept. 18, 1962
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and the strip surface acts as cooling medium which pre
vents excessive heating of the guide bars.
Rudolf Josef Amtmann, Herner, Westphalia, Germany,
assigner to Maschinenfabrik August Sentire, Hemer,
the curved guide surface of each guide bar at least one
METHOD AND APPARATUS FOR DESCALING
STRIP MATERIAL, ESPECIALLY STlRlP IRON
Westphalia, Germany
Filed Feb. 17, 1958, Ser. No. 715,666
Claims priority, application Germany Feb. 16, 1957
6 Claims. (Cl. 29-S1)
The invention relates to a method and an apparatus
for continuously descaling strip material and especially
strip iron, in which the strip is drawn in zig-zag fashion
over deilecting cylinders and mutually displaced and ad
Another object of the present invention is to provide
an apparatus for continuously descaling strip material,
particularly strip iron, which comprises in the region of
passage extending substantially perpendicularly to the sur
face of the strip for feeding the pressure water between
the guide bar and the surface of the strip. In order,
10 particularly in the case of relatively wide strips, to obtain
as far as possible a pressure water cushion of uniform
conñguration over the entire width of the strip, it is ad
visable to equip each guide bar with several feed passages
distributed over its length, which passages are connected
justable metal guide bars with curved guide surfaces, 15 to a common feed conduit for the pressure Water. The
feed passages are preferably constructed as nozzles and
and the scale is detached by the guide bars engaging in
arranged with their axes in the longitudinal central plane
the vertex of a bending angle formed by the strip.
of the guide bar, so that the strip is lflushed with water
'I'he invention is based on a former suggestion of the
jets projected with great force, practically over its entire
applicant, according to which the strip material is drawn
in zig-zag fashion over deflecting cylindersvand mutually 20 width, and the scale detached from the surface of the
strip by bending the strip is iiushed out of the pores of
displaced and adjustable metal guide bars with curved
the strip and washed away. The mouths of the nozzles
guide surfaces. The strip is passed over each guide bar
are preferably widened in fan-shape in the longitudinal
at a bending angle which is preferably between 60 and
direction of the guide bars so that, to obtain the same
120°. The scale is thereby detached from the surface
of the strip by the guide bar arranged in the vertex of the 25 descaling effect, a smaller number of nozzles is required.
In another form of construction the apparatus accord
bending angle, a portion of crushed scale being drawn
between the bar and the strip to serve as lubricant, for
the subsequent removal of which brushes are provided.
An object of the present invention is to improve this
`descaling method by feeding water under high pressure
(for example 30 to 100 atms.) between the guide surface
ing to the invention is provided with at least one elon
gated pressure water chamber extending in the longitu
dinal direction of the guide bar, which pressure water
chamber is open toward the guide surface of the bar and
connected to a pressure water feed conduit.
In order
to obtain a uniform distribution of pressure water on
of the guide bar and the strip, so that a layer or cushion
the entire width of the strip, it is preferable to provide
of pressure water is produced on which the strip slides.
several pressure water chambers arranged one behind
In this manner the strip is slightly lifted from the guide
the other in the longitudinal direction of each guide bar,
surface of the guide bar so that it no longer comes in
which chambers extend over a considerable portion of
direct contact with the guide surface but slides on the
the width of the strip and are connected by short con
cushion of pressure water located between this surface
nection 'passages to a distributor passage of relatively
and the surface of the strip. The `friction between the
large cross section arranged under the guide bar and ex
guide bar andthe surface of the strip is therefore re
duced to such an extent that the guide bar is only sub 40 tending in the longitudinal direction thereof.
. According to an alternative embodiment of the inven
jected to slight wear and it is no longer necessary to
tion, the apparatus can be so constructed that adjacent
make the guide bar from hard metal. Due to the cushion
each of the longitudinal sides of each guide bar prefer
of pressure water between the guide bar and the surface
ably several spraying nozzles are arranged within the
of the strip, scraping or scratching of the strip on the
bending angle formed by the strip, and distributed over
guide bar is positively prevented even if, for example in
the width of the strip, which nozzles squirt pressure wa
the case of a very thin layer of scale, the quantity of
ter jets between the facing surfaces of the strip and guide
scale drawn between the guide bar and the surface cf the
bar. Also in this case it is advisable to spread the pres
strip is not sufficient to prevent the surface of the strip
sure water jets in fan-fashion parallel to the apex of the
from being scratched.
50 guide bar so as to obtain the greatest possible effect with
As the strip practically floats on the cushion of pres
the smallest possible number of nozzles and a relatively
sure water between the surface of the strip and the guide
bar, the pulling force necessary for moving the strip is,
Small quantity of water. Distributing pipes carrying the
sulting therefrom is less than in the case of a descaling
angle of the strip actually chosen.
Spray nozzles and extending adjacent both sides of theowing to the reduction in friction achieved thereby, con
guide
bars are preferably constructed so that they are ver
siderably less so that pulling devices of a smaller ca 55
tically and laterally adjustable and rotatable about their
pacity can be used. Owing to the smaller frictional forces
longitudinal axis so as to enable the direction of the pres
which have to be overcome when descaling the strip, the
sure water jets to be adjusted in relation to the bending
longitudinal expansion and the hardening of the strip re~
method operating without pressure water cushion. By
the pressure water fed in the range of the guide bar, the
scale detached from the surface of the strip by the bend
ing of the strip is flushed away immediately on becom
With the 'aid of the invention metal strips with a very
wide range of thicknesses, for example strip iron from
about 0.5 to l0 and even more mms. in thickness can be
descaled. The size of the bending angle depends upon
the material and the thickness of the strip, and also upon
ing detached, so that no'accumulations of scale can form
the thickness and composition of the layer of scale. In
between the guide bar and the surface of the strip, there 65 most cases the most favorable bending angle lies between
by preventing any particles of loose scale from being
about 60 and 120°, but deviations from these values are
pressed into the surface of the strip by the high surface
pressures existing between the guide bar and the strip.
Several preferred embodiments of the invention are
Another advantage of the method according to the in
illustrated by way of example in the accompanying
vention consists in that the bearing pressure transmitted 70 drawings, in which: '
FIG. l is a diagram showing the general layout of a
from the strip on to the guide bar is reduced consider
descaling apparatus according to the invention;
ably and the pressure water fed between the guide bar
conceivable.
'
r
~
3,054,162
3
A
FIGS. 2 and 3 are vertical central sections showing
33, at least one of which is driven. These feed-in cylin
ders are followed by the cylinders of the braking device
the descaling apparatus in greater detail, FIG. 2 showing
a first portion and FIG. 3 a second portion of the ap
paratus;
2. In the present case five cylinders are provided some
of which are braked directly or on their ends. These
FIG. 4 is a cross section through a guide bar equipped
with pressure water nozzles;
cylinders also serve for straightening the strip. Means
for braking the cylinders of the braking device are indi
FIG. 5 is a top plan view of FIG. 4;
cated at 34. The braking force can be adjusted by spring
pressure. The strip 1 passes from the braking device 2
into a first descaling unit 35- of the apparatus in which
FIG. 6 is a cross section through a modified guide bar
equipped with pressure water chambers;
FIG. 7 is a top plan view of FIG. 6;
the strip is guided over cylinders 36 and 5. The guide
FIG. 8 is a cross section through another modification
bar 3 is arranged between these cylinders 36 and 5 and
is adjustable in vertical direction by means of a spindle
37. The cylinders 36 and 5 can be adjusted in vertical
direction with the aid of spindles 38. A rotary brush
19 is mounted above the cylinder 5 and driven by a
of guide bar equipped with spraying nozzles on both sides,
and
FIG. 9 is a top plan view of FIG. 8.
Referring now more particularly to the drawings, FIG.
l shows a descaling apparatus in which a strip of band
iron 1 running off a reel, not shown in the drawings, is
first passed through a braking device 2 composed of four
motor 33.
After the removal of scale on one side of the
strip 1, the latter passes from the descaling unit 35 into
the pulling device 6 which has driven cylinders 39 around
which the strip is passed so as to be pulled through the
unit 35 against the resistance of the braking device 2.
mutually adjustable cylinders. By adjusting the cylinders
of the braking device 2 in the directions x-x1 the trac
tional resistance of the strip can be regulated. A dressing
For descaling the other side of the strip 1, the strip
travels first through another braking device 40 following
or straightening mechanism which is not driven can, for
example, also be used as braking device. An upper cyl
inder 2a of the braking device 2 serves at the same time
the pulling device 6 and corresponding substantially to the
braking device 2. As shown in FIG. 3, the strip 1 then
as guiding and deñectíng cylinder for the strip 1 which
is subsequently passed in Izig-zag fashion over a guide
enters a second descaling unit 41 of the apparatus in
which the guide bar 3a is arranged. This guide bar 3a
is located between guide cylinders 42 and 3. A rotary
brush 26 is coordinated to the cylinder 8 and driven by
bar 3 which is detachably mounted on a carrier 4 adjust
able in the directions y-y1. The guide bar 3, as can
be seen from FIGS. 1 and 4, engages the surface of the
a motor 43.
Two further units 44 and 45 are connected
strip in the vertex of the bending angle a formed by
the strip 1. The size of the bending angle a depends
partly upon the material of the strip to be descaled, the
thickness of the strip and also the composition and thick
ness of the scale layer and generally lies between 60
up in series behind the second descaling unit 41. The
units 44 and 45 include driven brushes 46 and 47 which
cooperate with adjustable guide cylinders 48 and 49 re
spectively. Spraying devices 50 are provided for supply
ing water under suñìciently high pressure to cach of the
and 120° in the case of iron strip about l to 10 mms. in 35 brushes 46 and 47. These spraying devices can be co
thickness. By adjusting the carrier 4 in the directions
ordinated to the upper and lower sides of the strip. Noz
y-yl the bending angle of the strip 1 can be adjusted
zles for spraying water under pressure are also coordi
within a range of, for example, about 60 to 150°. The
nated to the already mentioned guide bars 3 and 3a. The
bending angle a is changed when a strip of a different
special forms of construction and arrangement will be
thickness and/or with a different scale composition is to 40 hereinafter described. Behind the unit 45 the pulling de
be passed through the descaling apparatus.
vice 9 is provided which corresponds in construction to
Behind the guide bar 3 engaging the under side of the
the pulling device 6 of FIG. 2.
strip in FIG. 1, the strip 1 is again deflected by a cylin
As can be seen from FIGS. 4, 6 and 8, the guide bar
der 5 and then runs through a pulling device 6, which,
3 has a curved guide surface 10. This guide surface 10
in the example illustrated in FIG. 1, consists of two cyl
is cambered according to a radius 1' which is differently
inders at least one of which is driven and which are
dimensioned in guide bars serving for descaling strips of
mutually adjustable in the directions z-z1. By chang
ing the spacing and the speed of rotation of the cylinders
different thicknesses. It has been found advantageous to
mounted in the pulling device 6, the tensional force irn
parted to the band 1 can be regulated. Behind the pull
ing device 6, the strip 1 is preferably guided over another
deñecting cylinder 7 and subsequently over a second
guide bar 3a displaced in relation thereto, which bar en
gages the upper side of the strip. By the guide bar 3a
the strip 1 is bent in zig-zag fashion in the opposite direc
tion, the bending angle al formed at the guide bar 3a
In the form of construction of the descaling apparatus
illustrated in FIGS. 4 and 5, the guide bar 3 and the
similarly constructed guide bar 3a are provided with sev
eral nozzles or jets 11 arranged at regular intervals apart
in the longitudinal direction of the bar, through which
make the radius r about four times as great as the actual
thickness s of the strip.
' nozzles water under high pressure of about 30 to 100
atms. for example, can be fed between the guide surface
1t) and the surface of the strip, The nozzles 11 are ar
ranged with their aXes in the longitudinal central plane
being of the same dimension as as the bending angle a
at the guide bar 3. The guide bar 3a is, just like the
guide bar 3, exchangeably mounted on a carrier 4a adjust
a-a of the guide bar 3. These nozzles 11 are connected
able in the directions y-y1. Behind the guide bar 3a 60 by means of short passages 12 to a distributor passage 13
the strip is returned into the horizontal plane of travel
of relatively large cross section passing through the guide
of the strip by a deflecting cylinder 8 and subsequently
bar over its entire length and extending parallel to the
runs through a second pulling device 9 which, like the
guide surface 10. The distributor passage 13 is, as can
pulling device 6, consists of cylinders adjustable in rela
tion to each other in the directions z-z1, at least one of
be seen from FIG. 5, connected at both ends to a feed
' conduit 14 and 14a respectively for the pressure water.
said cylinders being driven at an adjustable speed of rota
tion.
In the descaling apparatus illustrated in FIGS. 2 and 3,
the first guide bar 3, contrary to the arrangement shown
in FIG. l, is arranged above the strip 1, whereas the sec
ond guide bar 3a shown in FIG. 3 is below the strip.
It is immaterial whether the arrangement raccording to
FIG. 1 or that according to FIGS. 2 and 3 is chosen.
As can be seen from FIG. 2 the strip 1, in entering the
apparatus, ñrst passes between a pair of feed-in cylinders 75
The pressure water is fed to the guide bars 3, 3a preferably
by a high-pressure pump which is not shown on the draw
ings but which is so constructed that the pressure and
quantity of the water fed can regulated, preferably con
tinuously, within wide limits. It is evident that it is also
possible to provide for the regulation of the pressure and/
or the quantity of water fed to the nozzles 11 of the guide
bars 3, 3a, throttle element elements fitted in the feed con~
duit 14, 14a.
As shown in FIG. 5, the nozzles 11 arranged one be
3,054,162
6
,
.
one behind the other in the longitudinal direction of
each pipe, the longitudinal axes of these nozzles being
bar 3, are uniformly distributed over a range correspond
located in the longitudinal central plane of their respec
ing to the total width b of the strip 1, so that a uniform
tive distributor pipes. It is evident that any desired num
layer of pressure water forms over the entire width of the
ber of spraying nozzles can be provided distributed over
strip between the guide surface 10 and the surface of the
the width of the strip. The spraying nozzles 31, 31a have
strip 1. As can be seen from FIG. 5, the nozzles 11 have
a mouth widened in fan-fashion in the longitudinal direc
their mouths 11a widened in fan-fashion in the longitu
tion of the distributor pipes 30, 30a, so that Water jets
dinal direction of the guide bars 3, 3a, whereby the mouths
32, 32a passing out therefrom are spread in fan shape
11a of adjacent nozzles overlap slightly. As a result
the jets of pressure water passing out of the nozzles 11 10 parallel to the crown of the guide bar 3. As can be seen
from FIG. 8, the water jets 32, 32a are sprayed with high
at a high speed spread in fan-fashion in the longitudinal
pressure between the facing surfaces of the strip 1 and
direction of the guide bars 3 and 3a respectively, so that,
the guide bar 3 overrthe entire width of the strip. By
even if adjacent nozzles 11 rare spaced apart at relatively
means of the high pressure water jets 32, 32a impinging
Wide spaces c, the whole width b of the strip is sprayed
with great force in the space between the strip 1 and the
with water jets emerging with a considerable amount of
guide surface 10, a pressure water cushion forms between
kinetic energy. The pressure water fed by the nozzles
the guide surface 10 and the surface of the strip facing
11 forms between the curved guide surface 10 and the
it, which cushion lifts the strip, slightly olf the guide bar
surface of the strip 1 facing this guide surface, a pressure
and washes away the scale loosened by the bending of
water cushion by which the strip is lifted oif the guide
hind the other in the longitudinal direction of the guide
surface 10. The water flows off laterally on both sides 20
of the guide surface 10 in the direction w--wl and per
the
strip.
Y
-
-
As indicated by arrows in FIG. 8, the distributor pipes
30, 30a are adjustable in height and laterally andare
pendicularly thereto.
mounted so that they can be turned about their longi
Y In the embodiment illustrated in FIGS. 4 and 5, the
tudinal axis, so that the pressure water jets ‘32, 32a can
guide bar 3 is exchangeably iixed on the carrier 4 by
bolts 15. Thus, the guide bar can be easily exchanged 25 always be accurately directed to the gap between the
stripV 1 and the curved guide surface 10 of the> guide »bar
when descaling strips o-f different materials, different thick
3. The adjustment of the distributor pipes 30, '30a is also
nesses, different widths and with different scale forma
necessary to enable the `direction of the high pressure
tions.
water jets 32, 32a to be adapted tothe actual bending
In the construction illustrated in FIGS. 6 and 7, the
guide bar 3 is composed of two halves 31 and 32, being 30 angle «x when changing this angle. The distributor pipes
30, 30a are connected at one end to a high pressure water
divided along a plane extending parallel to the longitu
conduit, not shown in the drawings.
.
dinal central plane ¿1_-a, which halves are clamped be
As. shown particularly in> FIG. 1, but also in FIGS. 2
tween jaws 23, 24. The clampin-g jaws 23, 24 are drawn
and 3, each of the guide bars 3 and ‘3a is followed by a
together by screws 25. The facing contact surfaces of
the guide bar halves 31 and 32 are ground and when 35 spraying device 16 and 16a respectively, providedwith a
plurality of nozzles distributed over the Ywidth b of the
in clamped position are pressed tightly one against the
strip and by which the surface of the strip actually de
other Áby the jaws 23, 24. It is evident that it is also
scaled is again sprayed with jets of water under high
possible to provide packings between the contacting sur
pressure. `Such a spraying device 16 or 16a can obviously
faces of the guide bars 31 and 32.
In the crown or apex of the curved guide surface 10 40 also lbe used when the guide bars are constructed as in
the embodiments illustrated in FIGS. 6 to 9. The nozzles
two elognated pressure water chambers 26, 26a are
of the .spraying device 16 or 16a, which are not shown
arranged one behind the other in the longitudinal direc
in detail in FIGS. 1 to 3, are connected by a common
tion of the guide bar 3. These pressure water cham
distributor pipe and by a connection conduit 17 or 17a
bers 26, 26a are open toward vthe guide surface 19, reach
to the Vfull height of the guide bar 3 and together ex 45 thereon, to awater feed conduit 1'8 or 18a leading to a
high pressure pump, not shown in the drawings, like the
tend over about three-quarters of the -strip width. The
connection conduits 14, 14a of the nozzles 11 or the
division plane of the guide bar 3 coincides with one of the
chambers 26, 26a, or the distributor pipes 30, 30u.
.
longitudinal walls of the pressure water chambers 26,
The strip 1, after passing the spraying device 16 or 16a,
26a. On Yboth sides of the pressure water chambers
26, 26a the crown of the guide bar 3 is provided with 50 is fed between at least one deflecting cylinder 5 or 8 and
a brush 19 or 20 respectively. The brushes 19, 20 engage
a longitudinal »groove 27 corresponding approximately
the descaled surface of the strip sprayed by the preceding
to the width of the chambers, which groove is only shal
spraying device .16 or 16a and are adjustable in the direc
low, being e.g. about 2 mms. in depth. With the aid
tion t-t1. Approximately tangential to the periphery of
of this shallow longitudinal groove a uniform pressure
water cushion is formed at the crown Vof the lguide bar 55 the brushes 19 and 20 respectively one or more adjustable
nozzles 21, 21a are arranged in the range'between the
3 on each side of the pressure water chambers 26, 26a
so that the scale will be washed away on both sides in
strip and the periphery of the brushes, by which nozzles
the longitudinal vdirection of the guide bar.
the contact area between the brushes and the surface of
The pressure water chambers 26, 26a are each con
the strip is ñushed by jets of Water under pressure directed
nected by two connection passages 28, 28a provided in
substantially tangentially to the periphery of the brushes.
the clamping jaw 24 to a distributor passage 29 of rela
By these pressure Water jets an improved brushing effect
tively large cross section extending through the clamp
ing jaw 24 in the longitudinal direction of the guide bar
and a continuous cleaning of the rotating brushes 19, 20
from particles of scale are attained. The spraying nozzles
21 and 21a respectively are, in the form of construction
3. The distributor passage 29, as in the .embodiment
illustrated in FIGS. 4 and 5, is connected at both ends 65 illustrated in FIGS. l to 3, connected to the same pressure
to pressure water feed conduits 14, 14a.
Water feeding conduits 18, 18a as the connecting conduits
In the form of construction illustrated in FIGS. 8 and
14, 14a of the guide bars 3, 3a or the connecting conduits
9, the guide bar ‘3 is solid, that is without passages or
chambers, but is also clamped between two jaws 23, 24
17, 17a of the spraying devices 16, 16a. As the pressure
of clamping screws 25. Distributor pipes 30, 30a of rela
of the guide bars 3, 3a and through the spraying devices
of the water fed through the nozzles 21, 21a may be con
which are adjustable in relation to each other by means 70 siderably lower than that of the water fed in the region
tively large cross section are arranged one on each of the
longitudinal sides of the guide bar 3 parallel with the
apex of the guide bar.
Spraying nozzles 31, 31a are
arranged on the periphery of distribution pipes 30‘, 30a
16, 16a, the nozzles 21, 21a are connected to feed con
duits 22, 22av provided with throttle devices. Further
more, independently adjustable throttle devices can also
be arranged in the connection conduits 14, 14a and 17,
3,054,162
O
d.)
17a in order to enable the pressure and/or the quantity
of water fed in the region of the guide bars 3, 3a and
through the spraying devices 16, 16a to be regulated in
dependently of each other. For the nozzles 21, 21a, how
of over a bending surface; and directing liquid contain
ing an abrasive material under pressure between said
bending surface and the surface of the strip material
adjacent to it to build a cushion of liquid between said
ever, a separate water feed conduit under lower pressure
surfaces and to prevent direct contact between the same.
can also be provided.
4. A method for descaling strip material comprising
the steps of guiding the strip material along a selected
path; bending the strip material during the passage there
of over a bending surface; and directing liquid contain
In the form of construction illustrated by way of ex
ample in FIG. 1, a brush is arranged behind each spray
ing device 16, 16a. In cases where exceptionally exigent
requirements are placed on the surface condition of the 10 ing abrasive material under pressure of between 30 to 100
atmospheres between said bending surface and the sur
be provided which are connected up in series. Further
face of the strip material adjacent to it to build a cushion
more, dry-operating brushes can also be provided instead
of liquid between said surfaces and to prevent direct
of or in addition to the wet-operating brushes for polish
contact between the same.
strips, it is evident that two or more brushes 19 or 20 can
ing the strips. It is likewise possible to dry the descaled
5. A method for descaling strip material comprising
wet bands in a drying device, for example a continuous
heating furnace, so as to avoid the formation of rust.
the steps of guiding the strip material along a selected
path; bending the strip material through an angle of
In order to improve the descaling effect, tine abrasives,
between 60 and 150° during the passage thereof over a
such as corundum powder, steel turnings or the like, can
be added to the water fed onto the surface of the strip in
bending surface; and directing liquid under pressure of
the region of the guide bars 3, 3a and/or through the
spraying devices 16, 16a. In such cases, it is advisable to
at least 30 atmospheres between said bending surface and
the surface of the strip material adjacent to it to build a
cushion of liquid between said surfaces and to prevent
make the nozzles of the guide bars 3, 3a as well as those
direct contact between the same.
of the distributor pipes 30, 30a and the spraying devices
16, 16a from wear-resistant and abrasion-proof material.
from the surface of strip material, comprising the steps
In some cases, it will also be advisable to add to the water
anticorrosive agents so as ot prevent the formation of rust
of pulling the baud under tension over guide rollers and
over an arc-shaped slide surface of guide bars mutually
6. Method for the continuous removal of scaly matter
during the descaling of strip iron.
displaced and adjustably arranged with respect to said
guide rollers in zig-zag `formation with said arc-shaped
slide surfaces, each of said arc-shaped slide surfaces
being arranged in the vertex of the angle of deflection
formed by the band, and simultaneously feeding water
The invention may be embodied in other specific forms
without departing from the spirit or essential character- f’
istics thereof. The present embodiments are therefore to
be considered in all respects as illustrative and not re
strictive, the scope of the invention being indicated by the
appended claims rather than by the foregoing description
and all changes which come Within the meaning and range
of equivalency of the claims are therefore intended to be
embraced therein.
under a pressure of 30 to 100 atmospheres between said
slide surfaces of each guide bar and the adjacent surface
L of the band, thereby forming a layer of pressure water
on which the band glides.
I claim:
l. A method for descaling str-ip material comprising
the steps of guiding the strip material along a selected 40
path; `bending the strip material during the passage there
of over a bending surface; building a layer of liquid be
tween said bending surface and the surface of said str-ip
material and preventing direct contact between said sur
faces by directing a liquid under suñicient continuous 45
pressure between said surfaces to maintain said layer
and thereby prevent said direct contact.
2. A method for descaling strip material comprising
the steps of guiding the strip material along a selected
path; bending the strip material during the passage there 50
of over a bending surface; and directing liquid under
pressure of between 30 to 100 atmospheres between said
bending surface and the surface of the strip material
adjacent to it to build a cushion of liquid between said
surfaces and to prevent direct contact between the same. 55
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Pecsok ______________ __ Nov. 23, 1943
Peterson _____________ __ .lune 15, 1954
2,857,655
2,877,534
2,913,808
Larson ______________ __ Mar. 17, 1959
Thomas _____________ __ NOV. 24, 1959
3. A method for descaling strip material comprising
Greenberger __________ _.- Oct. 28, 1958
FOREIGN PATENTS
the steps of guiding the strip rnaterialalong a selected
path; bending the strip material during the passage there
York ____ ___________ __ Mar. 18, 1884
Lundstrand __________ __ Dec. 24,
Hock _______________ _.. Aug. 18,
Longwell _____________ __ Feb. 7,
Hurtt _______________ __ Dec. 13,
Evans ________________ -_ Apr. 4,
Simons ______________ __ June 11,
Johansen ____________ __ Sept. 23,
Stanier _______________ __ May 4,
22,055
Sweden ______________ __ Nov. 2, 1905
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