Note: Descriptions are shown in the official language in which they were submitted.
4 64881-342
63-264,215 comb.
METHOD AND APPARATUS FOR GUIDING AND
TRANSFERRING RAPIDLY QUENCHED METALLIC TAPES
This invention relates to a method and an apparatus for
guiding and transferring a rapidly quenched metallic tape
(referred to "tape" hereinafter), particularly an amorphous metal-
lic tape produced by a single roll method from a single cooling
roll (referred to "cooling roll" hereinafter) to a winder.
Recently, techniques have been investigated and
developed to produce metallic tapes directly from molten metals
(including alloys) by methods involving rapid liquid quenching
such as a single roll method and a twin roll method. In carrying
out these methods, the producing technique itself may of course be
important to determine surface configurations and uniformity in
thickness of the metallic tapes. However, in the production of
the metallic tapes on an industrial scale, it is necessary to
accomplish handling of produced metallic tapes and techniques for
winding the metallic tapes into coils.
In the case of crystalline metallic tapes having a
thickness of not less than 100~ m, feeding speeds of the tapes are
usually not more than 5 m/sec, the limitation resulting from
solidification due to heat transfer to a cooling element. There-
fore, such metallic tapes can be transferred by a mesh belt having
~-
64881-342
a clamper and taken up by winding by a heat-resistant belt wrapper
as proposed in Japanese laid open Patent Publication No.
61-88,904.
In the case of amorphous metallic tapes, on the other
hand, they are very thin (less than 50 ~m) and the feeding speed
of the tapes is not lower than 20 m/sec. Therefore, the means
disclosed in the above Japanese Publication could not be applied
without any modifications. With the amorphous metallic tapes,
moreover, the characteristics of the materials tend to change
depending upon producing speeds so that mechanical strengths are
often spoilt. Therefore, it is more difficult to accomplish the
taking-up technique because the producing speed could not be
changed in taking-up on a reel and taking off.
It has been proposed to wind an amorphous metallic tape
onto a take-up reel having a magnet embedded therein arranged
closely adjacent a cooling roll in Japanese laid open Patent
Publication No. 57-94,453 and Japanese Patent Publication No.
59-34,467. This method is dexterous in arranging the take-up reel
closely adjacent the cooling roll to eliminate the troublesome
transferring of the tapes. However, as the reel is close to the
cooling roll, it is not necessarily suitable for continuous
production of the tapes. Moreover, it is not suitable for indus-
trial production on a large scale, due to lack of space for
CA 02001148 1998-11-27
provldlng lnspectlon devlces for thicknesses and apertures of
tapes and control devlce for tenslle forces on the tapes.
In order to avold these dlsadvantages, proposals for
posltively accompllshlng the transfer technlque by arranglng
wlnders remote from coollng rolls have been dlsclosed ln
Japanese lald open Patent Publlcatlon Nos. 56-12,257, 59-
43,772 and 59-138,572 and 1-133,652 (lald open on May 25,
1989). In these technlques, lt has been proposed to use
suctlon devlces, brush rolls or brush-solld roll palrs and the
llke as plnch rolls for catchlng and transferrlng amorphous
metalllc tapes. A stable taklng-up of amorphous metalllc
tapes can be reallzed lf amorphous metalllc tapes are caught
between plnch rolls wlthout belng ruptured and glven tenslle
forces requlred for transferrlng.
As there ls llttle llterature and data concernlng
the transferrlng and taklng-up technlques after produclng
amorphous metalllc tapes ln comparlson wlth produclng
technlque thereof, lt ls not an easy matter to study all the
technlques. The lnventors have lnvestlgated and lmproved the
gulde and transfer of amorphous metalllc tapes peellng and
flylng from coollng rolls arranged remote from wlnders on the
basls of the acknowledgement that the arrangement of wlnders
remote from coollng rolls ls baslcally
-- 4
64881-342
64881-342
industrially superior, and they have encountered the following
problems.
In the guiding and transferring systems above described,
brush-solid roll pairs made of a combination of brush rolls and
solid rolls are used as pinch rolls. It has been ascertained that
by embracing an amorphous metallic tape between pinch rolls,
tensile forces required for transferring are given to the metallic
tape.
In guiding a rapidly quenched metallic tape produced by
solidification through rapid quenching on a cooling roll to pinch
rolls through a transfer guide after the peeling from the cooling
roll, the guiding was achieved without much difficulty by applying
parti~ular devices to an air knife and the transfer guide. How-
ever, the metallic tape could not be pulled, even if the pinch
rolls were pressed together. Therefore, the pinch rolls could not
be used as a transfer system by moving the pinch rolls to a
winder. Tensile forces required for transferring could not be
given to a metallic tape only by transferring the metallic tape
peeled from a cooling roll through a transfer guide.
It is an object of the invention to provide a method and
an apparatus for guiding and transferring a rapidly quenched
metallic tape by giving tensile forces required for transferring
to the winder.
In order to achieve this object, in a method of guiding
and transferring a rapidly quenched metallic
,~f
tape lncluding steps of peeling the rapidly quenched metalllc
tape produced by solldlflcatlon through rapld quenchlng on a
clrcumferentlal surface of a slngle coollng roll rotatlng at a
hlgh speed, lntroduclng the metalllc tape lnto a cyllndrlcal
transfer gulde to a plnch roll unlt arranged at a termlnal end
of the transfer guide to catch the metalllc tape by the pinch
roll unit, and movlng the plnch roll unlt to a wlnder for
metalllc tape, accordlng to the lnventlon the metalllc tape ls
fed in the transfer gulde substantlally wlthout being ln
contact wlth the transfer gulde.
The transfer gulde ls preferably arranged ln a
flylng dlrectlon of the metalllc tape peeled from the slngle
cooling roll to feed the metallic tape substantially without
being in contact wlth the transfer gulde.
Accordlng to another aspect, the lnvention provides
an apparatus for guidlng and transferring a rapidly quenched
metalllc tape comprlslng a cyllndrlcal transfer gulde for
lntroduclng therelnto and guldlng thereln the rapldly quenched
metalllc tape produced by solldificatlon through rapld
quenchlng on a clrcumferential surface of a single cooling
roll and peeled therefrom, sald transfer guide being arranged
on a normal line of the slngle coollng roll at a posltlon
where the metallic tape ls peeled, sald transfer guide having
upper and lower edges adiacent sald slngle coollng roll and
defining clearances with respect to said single coollng roll,
plnch roll unlt arranged at a termlnal end of the transfer
gulde for catchlng the metalllc tape, and a transfer trolley
for transferrlng sald plnch roll unit to a wlnder for the
metallic tape, said transfer guide is arranged ad~acent sald
.~
~~ 64881-342
70 ~
single cooling roll, and the apparatus further comprises an
air knife for peeling the metallic tape from the single
cooling roll by air ~ettlng, said alr knife being arranged
extending from a downstream side of a rotation directlon of
the single cooling roll toward said upper clearance between
the single coollng roll and the transfer guide, and an
ad~usting plate on said transfer guide for ad~usting the upper
clearance between the single cooling roll and the transfer
guide.
The invention will be described with reference to
the accompanying drawings, whereln:
Figure 1 is a schematic vlew of an apparatus for
guidlng and transferrlng a rapidly quenched metallic tape
according to the invention;
Figure 2 ls a schematic view of the conventional
apparatus for guiding and transferring a rapidly quenched
metallic tape;
Figure 3 is a graph showing the relatlon between the
flying dlrection and rupture of metallic tape;
Figures 4a and 4d are views showing the distribution
of air flow rate in the transfer guide;
Figures 5a to 5b are views showing the lnfluence of
air flow rate in the transfer guide; and
Figure 6 is a graph showing the relation between the
length of a transfer gulde and the tlme of catching the
metallic tape.
In Figure 1 is shown a preferred apparatus for
gulding and transferrlng the rapldly quenched metalllc tape
according to the invention, wherein numeral 1 is a
64881-342
20011~8
cooling roll rotating at a high speed. A metallic tape
2 prepared by solidifying through rapid quenching on the
surface of the cooling roll 1 is peeled off from the
cooling roll 1 with an air knife 3 and guided into a
05 cylindrical transfer guide 4, at where the tape 2 is
caught by a pinch roll unit 5 (combination of brush roll
5a and solid roll 5b) placed on a transfer trolley 6.
Then, the transfer trolley 6 is moved together with the
pinch roll unit 5 toward a winder (not shown), whereby
the tape 2 is taken up on the winder. Further, a
deflector roll 7 is arranged at an entrance side of the
transfer guide 4, which functions to form an adequate
pass line when tension is applied to the metallic tape.
Moreover, a high speed air flow is formed inside the
transfer guide 4 by means of a blower 8 arranged behind
the pinch roll unit 5. Numeral 9 is a pouring nozzle.
In this case, it is important that the transfer
guide 4 is arranged so that the axial line of the guide
locates on a normal line at a peeling point of the
metallic tape 2 from the cooling roll 1, whereby the
flying metallic tape 2 is not contacted with the inner
wall of the transfer guide 4.
The invention will be described with respect to
experimental results leading in the success of the
invention.
The guiding and transferring of the metallic
200~8
tape 2 were repeated by using the apparatus shown in
Fig. 2. In this apparatus, the transfer guide was
shifted from the normal line at the peeling point of the
metallic tape without the air adjustment and the
05 optimization of the deflector roll as shown in Fig. 2.
According to the above experiments, the metallic
tape 2 could be introduced from the cooling roll 1
through the transfer guide 4 into the entrance side of
the pinch roll unit S, but tension could not be applied
to the metallic tape 2. In order to elucidate this
cause, the behavior of the metallic tape flying inside
the transfer guide was recorded by means of VTR or the
like, but in this case, only the continued metallic tape
was observed. However, it has been confirmed that if it
is intended to cast the metallic tape of amorphous alloy
aiming at the invention, since the tape forming rate is
usually 25-30 m/sec, an apparently static image can not
be obtained by a general picture system, so that the
detail movement of the metallic tape can not be
analyzed. Now, when the picturing was carried out by
making the whole of the apparatus dark and conducting
stroboradiation at l/50000 sec, an apparently static
image of the metallic tape flying inside the transfer
guide could be recorded by VTR.
When the recorded image is analyzed in detail,
there are obtained the following results, which can not
CA 02001148 1998-11-27
qulte be antlclpated ln the conventlonal VTR observatlon.
(1) The metalllc tape flylng lnslde the transfer gulde
was ruptured ln some places;
~ 2) The cracks were fre~uently observed ln the metalllc
tape flylng lnslde the transfer gulde;
(3) The cracked metalllc amorphous tape was easlly
ruptured through the appllcatlon of tenslon.
That ls, lt has newly been found that the occurrence
of such a rupture ln the transfer gulde ls a cause of not
applylng tenslon to the metalllc tape of amorphous alloy
through the plnch roll unlt.
On the other hand, it ls well-known that the
mechanlcal strength of the amorphous alloy tape ls very hlgh.
When examlnlng the cause of easlly generatlng the crack ln
such a hlgh strength materlal lnslde the transfer gulde, there
ls caused a problem when the metalllc tape ls passed through
the transfer gulde. That ls, when the metalllc tape flylng at
a hlgh rate of 25-30 m/sec collldes wlth the lnner wall face
of the gulde, the cracks are generated or the tape ls broken.
Thls ls consldered to result from such a characterlstlc of the
amorphous metalllc tape that the tape ls strong to unlaxlal
tenslon but ls weak to shearlng force.
In order to solve thls problem, accordlng to the
lnventlon, when the metalllc tape peeled off from the coollng
roll wlth the alr knlfe flles lnslde the transfer gulde, the
tape does not substantlally come lnto contact wlth the lnner
wall face of the transfer gulde. Partlcularly, the transfer
gulde ls arranged ln a dlrectlon that the metalllc tape peeled
-- 10 --
64881-342
CA 02001148 1998-11-27
off from the coollng roll wlth the alr knlfe flles freely,
whereby lt prevents contact of the metalllc tape flylng lnslde
the transfer gulde wlth the lnner wall face of the transfer
gulde to reallze the transferrlng of the metalllc tape wlthout
lmpact.
Moreover, when the transfer gulde 4 as shown ln Flg.
1 ls not arranged between the coollng roll and the plnch roll
unlt, the rupture of the metalllc tape by colllslon is never
caused, but the metallic tape cannot stably be gulded lnto the
plnch roll unlt. Therefore, the arrangement of the transfer
gulde ls essentlal ln the lnventlon.
If lt ls lntended to produce the metalllc tape by
the slngle roll method, the metalllc tape peeled off from the
coollng roll wlth the alr knlfe tends to fly ln a dlrectlon of
a normal llne at the peellng posltlon on the roll surface, so
that the metalllc tape flles as lf lt sprlngs out from the
center of the roll. Therefore, when the transfer guide is
arranged ln such a dlrection, the metallic tape ls hardly
sub~ected to impact by contactlng with the inner wall face of
the gulde, and
64881-342
- '- 7 ~ 64881-342
consequently there is caused no cracking or rupture of the metal-
lic tape.
Further, the distance (width) of the clearance 10 can be
adjusted by an adjusting plate 11 arranged on an upper edge
portion of an inlet port 4a of the transfer guide 4 and freely
moved relative to the cooling roll 1, whereby the width of the air
flow passage is increased or decreased to change a blowing amount
of air to the metallic tape 2 to thereby control the flying direc-
tion of the metallic tape 2.
Further, the inventors have examined the influence of
air flow inside the transfer guide 4 on the flying trajectory of
the metallic tape 2 flying at high speed inside the transfer guide
and found the following facts.
That is, when air flow is jetted from the air knife 3
under sufficient pressure to peel off the metallic tape 2, the air
flow in the vicinity of the inlet port of the transfer guide does
not advance toward the pinch roll unit in the transfer guide but
flows downward toward the bottom face inside the transfer guide.
Therefore, the metallic tape 2 peeled off from the cooling roll 1
collides with the bottom face of the inner wall of the transfer
guide under an influence of such a downward air flow and then
takes a flying trajectory in the horizontal direction together
- 12 -
~a
64881-342
with air flow gradually directing toward the pinch roll unit
inside the transfer guide.
It is possible to avoid the collision of the metallic
tape 2 with the inner wall of the transfer guide 4 to a certain
extent by weakening the air flow from the air knife 3. However,
the air knife 3 acts to give sufficient pressure to completely
peel the metallic tape 2, so that there is a restriction for
reducing the quantity and pressure of the air flow.
On the other hand, it is difficult to coincide the jet-
ting direction of air from the air knife with the direction of theair flow inside the transfer guide (direction toward pinch roll
unit) in view of the structure.
When the flying trajectory of the metallic tape 2 is
analyzed from the VTR image, it has been confirmed that if the air
flow from the air knife 3 contacts the flying metallic tape over a
wide area, the trajectory of the tape 2 directs downward to
collide with the inner wall of the transfer guide.
In other words, it has been found that it is possible to
control the advancing direction of the metallic tape by adjusting
the contacting area of air flow from the air knife 3 with the tape
.
In order to realize such a control, it is advantageous
to freely change the width of the air flow from the air knife 3.
-
64881-342
Figure 3 shows the rupture number of the metallic tape
inside the transfer guide (A) when the clearance between the
transfer guide 4 and the cooling roll 1 is narrowed to direct the
tape toward the pinch roll unit and (B) when the clearance is
widened to direct the tape toward the bottom face of the guide.
As seen from the results of Figure 3, the metallic tape
2 can be guided into the pinch roll unit 5 by adjusting the
clearance between the transfer guide 4 and the cooling roll 1
without rupturing the tape inside the transfer guide.
Moreover, the optimum value of the clearance 10 between
the transfer guide 4 and the cooling roll 1 should be determined
by confirming the flying trajectory of the metallic tape because
this value is varied by physical adhesion force between the tape 2
and the cooling roll 1, suction force at the inlet of the transfer
guide 4, relative arrangement between the peeling position of the
tape and the clearance 10 and the like.
There may be caused a case in which the flying posture
of the metallic tape 2 just after the peeling does not necessarily
take the horizontal flying trajectory. In this case, it is suffi-
cient to change the distance of the clearance 10 in the widthwise
- 14 -
64881-342
direction of the metallic tape.
In addition, a high speed air flow is formed inside the
transfer guide 4 by suction of air through the blower 8 arranged
behind the pinch roll unit 5. In this case, it is important that
the flow rate of the high speed air flow inside the transfer guide
4 is measured by means of a flow meter (not shown), while the tape
passing rate of the metallic tape 2 is measured by means of a
tachometer (not shown) based on the rotating rate of the cooling
roll 1, whereby the flow rate of the high speed air flow is set
above the measured tape feeding speed.
~ uch a flow rate of the high speed air flow inside the
transfer guide 4 can be adjusted and set to a given value by
changing at least one of the following parameters: the suction
amount of the blower 8, the air jetting quantity of the air knife
3, the clearance 10 between the cooling roll 1 and the transfer
guide 4 and the inner shape of the transfer guide 4.
In this connection, it has been found that the collision
of the metallic tape with the inner wall of the transfer guide can
substantially be avoided when the flow rate of the high speed air
flow in at least the second half of the transfer guide is made
faster than the tape feeding speed of the metallic tape.
Furthermore, the rupture of the rapidly quenched
- 15 -
CA 02001148 1998-11-27
metallic tape on the inner wall face of the transfer guide can
be prevented by limiting the length of the transfer guide to a
range of 10 cm - 100 cm. The reason for such a limitation of
the transfer guide length will be described with respect to
the following concrete experimental data.
The transfer guide 4 was arranged as shown in Fig.
1, and the length of the transfer guide was varied over a
range of 10 cm to 200 cm, while a high speed air flow of about
35 m/sec was formed inside the transfer guide 4 by means of
the blower 8 behind the pinch roll unit 5.
The amorphous alloy tape peeled off with the air
knife 3 was smoothly guided into the transfer guide 4 and
caught by the pinch roll unit 5 after the confirmation of
passing the tape between the brush roll 5a and the solid roll
5b constituting the pinch roll unit 5 at an open state during
which the time for catching the tape was measured to obtain
results as shown in Fig. 6. As seen from Fig. 6, when the
transfer guide length is not more than 100 cm, the catching of
the tape is in 10 seconds. If the length exceeds 100 cm, the
catching becomes considerably difficult, because it is
considered that as the length of the transfer guide becomes
long, the probability of rupturing the tape on the inner wall
of the transfer guide through collision becomes high. On the
other hand, when the transfer guide length is less than 10 cm,
the high speed air flow required for the catching through the
pinch roll unit 5 cannot stably be formed.
64881-342
CA 02001148 1998-11-27
Accordlng to the lnventlon, the metalllc tape peeled
off from the coollng roll ls passed through the transfer gulde
to the plnch roll unlt at substantlally non-contact state to
the lnner wall of the transfer gulde by means of a deflector
roll havlng a functlon as an alr floater located at the
entrance slde of the transfer gulde. For thls end, the
deflector roll ls arranged at the entrance slde of the
transfer gulde at such a certaln space upward from the bottom
of the transfer gulde that alr sufflclently passes between the
deflector roll and the bottom of the transfer gulde so as not
to dlsturb the alr flow requlred for controlllng the flylng
posture of the metalllc tape flylng lnslde the transfer gulde.
The deflector roll ls constructed so as to make
constant the formatlon of pass llne between the peellng polnt
from the coollng roll and the plnch roll unlt when tenslon ls
applled to the metalllc tape peeled off from the coollng roll
by the actlon of the plnch roll unlt and to serve as an alr
floater for ellmlnatlng the frlctlon wlth the deflector roll.
Furthermore ln order to provlde good flylng posture of the
metalllc tape before the catchlng by the plnch roll unlt there
ls a space between the deflector roll and the transfer gulde
that alr flow sufflclently flows toward the dellvery slde of
the transfer gulde. Moreover, the deflector roll ls provlded
wlth alr ~et ports 14 ~ettlng alr as an alr floater for
causlng no frlctlon between the pass llne of the metalllc tape
after the catchlng and the deflector roll. If necessary, an
64881-342
CA 02001148 1998-11-27
apron (gulde plate) 15 smoothly flowlng alr flow lnslde the
transfer guide may effectlvely be arranged on the lower face
of the deflector roll ln order to make the dlsturbance of alr
flow lnslde the transfer gulde through the deflector roll.
The deflector roll 7 acts to form an adequate pass
llne when tenslon ls applled to the caught metalllc tape.
Partlcularly, lt can be sald that the deflector roll 7 ls
effectlve to form the adequate pass llne when the settlng
posltlon of the transfer gulde 4 changes ln the helght
dlrectlon of the coollng roll.
Furthermore, the use of the deflector roll as
mentloned above brlngs about the followlng unexpected results
whlch have never been observed by VTR:
(1) When the metalllc tape ls caught by the plnch roll
unlt, lt ls stralght tensloned between the plnch roll unlt and
the coollng roll. If the deflector roll ls present
therebetween, the pass llne of the metalllc tape ls formed
between the deflector roll and the coollng roll, and
consequently the stable peellng polnt can be malntalned
lrrespectlve of the alr flow from the alr knlfe;
(2) The tenslon ls lnstantly applled to the metalllc
tape ln the catchlng through the plnch roll unlt, but the
metalllc tape ls ruptured by the deflector roll lmmedlately
thereafter;
(3) The metalllc tape ls lnstantly closed to the
deflector roll ln the catchlng through the plnch roll unlt;
64881-342
CA 02001148 1998-11-27
(4) The metalllc tape collldes wlth the bottom face of
the transfer gulde to cause the rupture thereof even after lt
ls separated downward from the deflector roll;
(5) It ls frequently observed that the metalllc tape
flylng inslde the transfer gulde ls beaten onto the bottom of
the transfer gulde ln the vlclnlty of the entrance slde
thereof by the downward alr flow from the alr knlfe.
Thus, the deflector roll ls essentlal to form the
pass llne between the plnch roll unlt and the coollng roll,
but brlngs about the rupture of the metalllc tape, whlch ls a
cause that tenslon ls not applled to the amorphous alloy tape
through the plnch roll unlt.
As a result of the lnvestlgatlons on such a cause,
lt has been found that when the metalllc tape caught by the
plnch roll unlt whlle applylng tenslon thereto comes lnto
contact wlth the deflector roll, frlctlon ls generated to the
metalllc tape on the surface of the deflector roll and
consequently there ls caused a so-called stlcklng phenomenon
that tenslon ls dlfferent between the upstream and the
downstream about the deflector roll. That ls, the dlfference
ln the speed of the metalllc tape between the upstream and the
downstream of the deflector roll ls caused to lower the speed
at the upstream than the tape feedlng speed, whereby the
slacklng of the tape ls caused to colllde on the deflector
roll.
Such a problem has been completely solved by
adaptlng an alr floater comprlsed of plural alr ~et ports 14
-- 19 --
64881-342
CA 02001148 1998-11-27
to the tape-passing face of the deflector roll as a means for
solving the sticking.
Although the metallic tape is caught without the
rupture through the deflector roll provided with the air
floater, a phenomenon that the tape is beaten onto the bottom
of the transfer guide immediately after the passing through
the deflector roll to cause rupture has further been confirmed
by VTR. This is based on the air flow about the deflector
roll. That is air drawn into the transfer guide through the
suction force of the blower is lost in the vicinity of the
bottom of the transfer guide at the entrance side thereof by
the deflector roll, and consequently the metallic tape is
subjected to downward force by the air flow from the air knife
for peeling the metallic tape.
For this end, a clearance is formed between the
deflector roll and the bottom of the transfer guide to form an
air flow therebetween. As a result, it has been confirmed
that air flowing through the clearance has an air flow rate
enough to push the metallic tape upward and cause no rupture.
Furthermore, the air flowing through the clearance largely
acts to push the posture of the metallic tape flying inside
the transfer guide upward at the initial stage between the
peeling from the cooling roll and the catching through the
pinch roll unit, and consequently the inconvenience of
colliding the flying metallic tape onto the bottom of the
transfer guide before the catching is considerably improved.
- 20 -
64881-342
CA 02001148 1998-11-27
In order to more smoothly flow air through the
clearance between the deflector roll and the bottom of the
transfer guide, an apron 15 is attached to the deflector roll,
which is effective to solve a wavy phenomenon of the metallic
tape due to discontinuous tension change.
The following examples are given in illustration of
the invention and are not intended as limitations thereof.
64881-342
~8
Example l
A molten alloy having a composition of 10 atomic
% (hereinafter referred to as llat%ll) of B, 9 at% of Si,
1 at% of C and the balance being Fe was kept at 1,300~C,
05 and ejected onto an uppermost portion of a cooling roll
made of a copper alloy and rotating at a high speed
(25 m/sec) through a slit-like nozzle having a width of
lO0 mm to produce an amorphous alloy tape of 25 ~m in
thickness. As shown in Fig. 1, the axis of a transfer
guide 4 was substantially directed toward the center of
the cooling roll 1. A high speed air flow was formed
inside the guide by means of a blower behind a pinch
roll unit.
Then, the alloy tape was peeled off from the
cooling roll with an air knife, and introduced into the
transfer guide. While the peeled alloy tape was
smoothly guided inside the transfer guide, it was led to
an opened state pinch roll unit constituted by a brush
roll and a solid roll. After the tape passed between
the rolls, it was caught by pressing down the brush roll
against the solid roll. The metallic tape flying inside
the transfer guide did not contact upper and lower faces
and side faces of an inner wall of the transfer guide at
least with impact.
25In this case, it was confirmed that a stable
tension was applied to the amorphous alloy tape flying
-22-
- Z001148
inside the transfer guide by the pinch roll unit under
rotation at a speed higher than that of the cooling roll
by about 2 m/sec, while the tape was not raptured inside
the transfer guide, and that the tape could be trans-
05 ferred by moving the pinch roll unit with use of atransfer truck.
Example 2
A molten alloy having a composition of lO at% of
B, 9 at% of Si, l at% of C and the balance being Fe was
kept at 1,300~C, and ejected onto an uppermost portion
of the copper alloy cooling roll rotating at a high
speed (25 m/sec~ through the slit-like nozzle having a
width of lO0 mm to produce an amorphous alloy tape of
25 ~m in thickness.
Then, the alloy tape was peeled off from the
cooling roll with the air knife, and guided into the
transfer guide. In order to prevent the alloy tape from
sticking against the inner wall of the guide during
flying in the guide, the width of an air flow from the
air knife was adjusted by advancing or retracting an
adjusting plate so that the alloy tape might smoothly
fly inside the guide at a substantially non-contact
state. The alloy tape was guided to the opened state
pinch roll unit constituted by the brush roll and the
solid roll. After the alloy tape was passed through the
rolls, it was caught by pressing down the brush roll
- 23-
~o~
against the solid roll. The alloy tape flying inside
the transfer guide did not contact the upper and lower
faces and the side faces of the inner wall of the
transfer guide at least with impact.
05 In this case, it was confirmed that a stable
tension was applied to the amorphous alloy tape by the
pinch roll unit under rotation at a speed higher than
that of the cooling roll by about 2 m/sec, while the
alloy tape flying inside the transfer guide was not
raptured in the guide, and that the alloy tape could be
transferred by moving the pinch roll unit with the
transfer truck.
Example 3
A molten alloy having a composition of lO at% of
B, 9 at% of Si, l at% of C and the balance being Fe was
kept at l,300~C, and ejected onto an uppermost portion
of the copper alloy cooling roll rotating at a high
speed (25 m/sec) through the slit-like nozzle having a
width of lO0 mm to produce an amorphous alloy tape of
25 ~m in thickness.
Then, the alloy tape was peeled off from the
cooling roll with the air knife by using the apparatus
shown in Fig. l. When the alloy tape was to be guided
into the transfer guide, a high speed air flow was
preliminarily formed inside the transfer guide by means
of the suction blower behind the pinch roll unit as
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~0~8
shown in Figs. 4a through 4d. Fig. 4a shows the shape
of the transfer guide and planes at which the flow rate
of the air stream was measured. Figs. 4b, 4c and 4d
show flow rates at the planes a, ~ and y and
05 respectively, by lengths of arrows and figures (m/s)
given thereunder. At that time, the maximum flow rate
of the air flow was 30 m/sec at the rear half portion of
the transfer guide as shown in Figs 4b to 4d.
The amorphous alloy tape peeled with the air
knife was smoothly guided inside the transfer guide.
After it was confirmed that the amorphous alloy tape
passed through the opened state pinch roll unit
constituted by the brush roll and the solid roll, the
tape was caught by pressing down lowering the brush roll
against the solid roll. The alloy tape flying inside
the transfer guide did not contact the upper and lower
faces and the side faces of the inner wall of the
transfer guide at least with impact. A static image of
the alloy tape introduced into the transfer guide was
shown at a scale of l/50,000 in Fig. 5a. For the
comparison, Fig. 5b shows a static image of the alloy
tape which contacted the bottom face of the tape
transfer guide when the flow rate of the air flow was
smaller than that of passing the amorphous alloy tape.
In the case of Fig. 5a, it was confirmed that a
stable tension was applied to the amorphous alloy tape
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CA 02001148 1998-11-27
by the pinch roll unit under rotation at a speed hlgher than
that of the coollng roll ls about 2 m/sec, while the tape
flylng lnslde the transfer gulde was not ruptured in the
gulde, and the metalllc tape could be transferred together
wlth the plnch roll unlt by moving the transfer table.
ExamPle 4
A molten alloy having a composltlon of Fe80BlOSlgC
(at%) was kept at 1,300~C, and e~ected onto an uppermost
portion of the copper alloy coollng roll rotatlng at a hlgh
speed of 25 m/sec through the sllt-llke nozzle havlng a wldth
of 100 mm to produce an amorphous alloy tape of 25 ~m ln
thlckness. The transfer gulde 4 was arranged as shown ln Flg.
1, and had a length of 60 cm. An alr flow at a hlgh speed of
about 33 m/sec was formed lnslde the transfer gulde 4 by the
blower 8 behind the pinch roll unit 5.
The amorphous alloy tape was peeled off wlth the alr
knife, and smoothly guided inside the transfer guide. Then,
after the tape was passed through the opened state plnch roll
constituted by the brush roll and the solid roll, the tape was
surely caught within 2 seconds by presslng down the brush roll
against the solid roll.
In this case, lt was conflrmed that a stable tension
was applied to the amorphous alloy tape by the pinch roll unit
under rotation at a speed higher than that of the coollng roll
by about 2 m/sec, whlle the tape flylng inside the transfer
guide was not ruptured ln the gulde, and that the tape could
be transferred together with the plnch roll unlt by movlng the
transfer trolley.
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CA 02001148 1998-11-27
ExamPle 5
A molten alloy havlng a composltlon of 10 at% of ~,
9 at% of Sl, 1 at% of C and the balance belng Fe was kept at
1,300~C, and e~ected onto an uppermost portlon of the copper
alloy coollng roll rotatlng at a hlgh speed of 25 m/sec
through the sllt-llke nozzle havlng a wldth of 100 mm to
produce an amorphous alloy tape of 25 ~m ln thlckness. As
shown ln Flg. 1, a deflector roll had alr ~et ports on the
slde along whlch the tape passed, and an alr lnflow openlng
was provlded between the bottom plate of the transfer gulde
and the deflector roll. A hlgh speed alr flow was formed
lnslde the transfer gulde by sucklng wlth the blower behlnd
the plnch roll unlt.
Then, the tape was peeled off from the coollng roll
wlth the alr knlfe, and gulded to the opened state plnch roll
unlt constltuted by the brush roll and the solld roll. After
the tape passed through the plnch roll unlt, the tape was
caught by presslng down the brush roll agalnst the solld roll.
Immedlately after the tape was caught, a tenslon was applled
to the flylng tape at a stretch so that a pass llne was formed
between the plnch roll unlt and the deflector. The tape was
gulded wlthout rupture, whlle the pass llne was stabillzed and
the tape dld not contact the deflector wlth lmpact. Next, lt
was conflrmed that a stable tenslon was applled to the
amorphous alloy tape by the plnch roll unlt under rotatlon at
a speed hlgher than that of the coollng roll by about 2 m/sec,
and that the tape could be tranRferred by movlng the plnch
roll unlt wlth the transfer table.
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CA 02001148 1998-11-27
As mentloned above, accordlng to the lnventlon, the
amorphous alloy tape produced by the slngle roll method can be
transferred and taken up wlthout rupture. Thus, the lnventlon
has great slgnlflcance as a produclng technlque of metalllc
tapes.
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