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Патент USA US2133051

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Patented oct. 11, -193e
Claude A. Bollinger,` Gary, Ind.
`Application March 24, 1937, Serial No. 132,823
i claim. (ci. zio-31.1)
This invention relates particularly to the join
ing of metal .strips in vsuperimposed relationship
by passing them through a set of pressure rolls
while providing suflicient heat to eiïect interweld
5 ing, but the broad principles of the invention
are applicable to many metal rolling problems.
The primary object is to prevent slipping of the
strips either relative one another or relative the
rolling surfaces necessarily involved. -
Another object of practically equal importance
is to roll the strips together so that they are re
spectively brought into' complete contact with
each other.’
Still other objects may be inferred from the
l5 following~ disclosure.
In the accompanying drawing:
Figure 1 is a sectional elevation of a mill em
bodying the principles of- the present invention.
Figure 2 is apartially sectioned view showing
20 the roll elements of this mill.
The mill includes a housing I which mounts~
two parallel rotary mandrels 2 having journals
-the pass of the rolls 4'and in a plane with the
same, from a furnace 6 (of which only the vend
is shown), then over a deilector roll 1 and so
to a tension reel 8. Suitable means for driving
this reel 8 so as to apply proper tension are l
known to those skilled in the art.
The outside metal strips are fed from coil boxes
9 which are oil‘set relative the pass line of the
rolls 4, through friction blocks Ill and from there _
tangentially onto the surfaces of the rolls 4, the 10
strips wrapping around these rolls throughv 180
degree arcs and eventually passing between them
so as to be brought into contact with the mid
dle strip. It now becomes obvious that the ten
sion reel handles all three strips, the heat from 15
the iron strip being sufficient to effect the weld
According to the prior art, when the general
operation under discussion is to be carried out,
the strips to be joined are passed between solid 20
rolling rolls very similar to, if not the same, as
metal rolling rolls. Furthermore, all the strips
-to be joined are fed through the rolling pass in
rather similar to metal rolling rolls, the jour- - at least approximately the same plane, this plane
coinciding with the pass line of the rolls used. 25
2,», nals 2a being adapted to turnin suitable bear
2a and fiuted ends `2b.
These mandrels 2 are
~ ings with those of the upper mandrel engaged
The above procedure is beset with two big dif- ‘
by suitable holddowns 3, and the iluted ends 2b ficulties, one of these being a decided tendency
being adapted for connection> with powered- of the strips to slip, relative the working rolls -
However, these mandrels 2 differ from ordi
nary rolling rolls in that they have circumferen
tially grooved surfaces, these grooves being
marked 2c in the drawing, and in that they work
through a set of hollow rolls 4 which encircle the
35 mandrels', these rolls being internally _grooved to
provide grooves 4*L which ñt the grooves 2c of
the mandrels._ The rolls 4 have inside diam
eters which are larger than the outside diameters
of the mandrels 2, whereby the rolls 4 rotate
40 eccentrically respecting the mandrels 2 when they
are pressed together by the operation of the‘hold
downs 3. The diameters of the respective parts
and one another, while the other is the inability
of the rolls to bring the strips into perfectly 30
flat, complete contact with each other when they
are fed in the same' common plane straight
through the roll pass. It requires little imagina
tion to realize'that both of these difliculties pref
-sent serious obstacles in the .way of obtaining a 35
product wherein the various >strips’are integral
ly united in such a manner as to permit sub
sequent processing, such as cold rolling and the .
like, or their fabrication into ultimate products.
this often involving drawing and forging effects. 40
Such difficulties are largely obviated by the in
vention under discussion. The rolls 4 rotating
eccentrically respecting the powered mandrels-2
should be related so that the rolls 4 may be slid
freely over the mandrels 2 when this is neces
provide endless rolling surfaces that'are under
45` sary, it being obvious that the inside diameter
of the rolls must be sufficiently large topermit
motion as the strips, the latter therefore being
clearance between the various grooves.
In the embodiment of the invention under dis
cussion, three strips are being welded together.
50 The inside one of these strips may be commer'
cially pure iron, while the outside strips may be'
copper, nickel or an alloy, or any of the 4other
metals commercially used in the production of
multiple-layer strip.
Guides 5 lead the iron _strip straight through
the same rolling pressure and Have much the same 45
imparted the same linear speed as the peripheral i
speed of the rolls. Interposed friction-reducing
films, such as are generally encountered in prac- 50
tice, are relatively immaterial.l The rolls 4 pro
vide endless successions of continuously over
lapping, progressively curved surfaces, as con
trasted to the rolling surfaces of ordinary rolls.
The contrast may be to some extent compared 55
with that existing' 'between a vtractor driven by
an endless chain and che driven by wheels.
mrthermore, due t6? the strips being 1ed tanï.
gentially ontc;E the roll* surfacesby means offset
fromrthe pass line of the rolls, the strips Imust
wrap at least partially around the roll surfaces
prior to their being 4pressed into contact with the
center strip. This, in conjunction with the fea
ture of the eccentrically driven rollsff4, assures
not only that no slipping will @our butL also, that
the outside strips Willi'have conformed exactly to
the cylindrical surfaces of the rolls prior to their
being pressedîonto the center or iron strip. This
wrapping feature also provides time for the outer
moststrips tóY absorb a large amount of the hèÍ
from; the rolls- 4, it being remembered that the
centéî‘ strip is heated and that heatL from
strip .is being constantly absorbed by ¿the rolls 4.
Although the principles ofîthe invention have
20 be'en disclosed by means of a 'specific example'in
'- accordance with the :patent statutes, itis not in
tended that its scope be thereby limited exactly
to this example, except to the extent deñned by
thegîappende'd claim.
¿ IÉclaim:
à mill characterized by a set of holiow rolls and 5
mandrels passed through said rolls and provided
with holddowns for applyinglpressure to said rolls,
the inside diameters of the latter being materially '
greater than the outside diameters of said man
drels, said mill being adapted to join strips in
superimposed relation and »',including means for
feeding one strip, means for heating said strip
and means offset from the pass line of said inan
dré?ls for feeding at least onel-o'therrstrip tangen
tially into contact with one of said?îrolls so that
it Wraps therearound to a suflicientìextent to ab
stract substantial amounts '-,òf heat from said roll
imparted thereto by the ñrst named strip, prior t0
passing through said rolls with the first named
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