Note: Descriptions are shown in the official language in which they were submitted.
107tj783
The present invention relates to rolls, of the type
which are used in paper machines, and in particular to a method
of manufacturing such rolls.
In order to manufacture a grooved roll of the type
used in a paper machine, it is known to wind onto the exterior
surface of an inner roll body an elongated metal strip the
profile of which is such that the strip has at an outer edge
region a thickness less at an inner edge region which engages
the inner roll body, so that as a result when such a strip
is wound onto the inner roll body the resulting roll will have
at its exterior an elongated helical groove. Thus, such grooved
rolls are known, the suitably profiled strip which is wound onto
the inner roll body being made of steel. In this connection
reference may be made to U.S. Pat. N 3,718,959.
Many rolls, of the type used in paper machines,
require a smooth exterior surface which should be resistant to
corrosion and/or wear and tear. Conventionally, such a smooth
covering is made from pieces of appropriate sheet material
which are welded onto an inner roll body. The covering provided
in this way is subsequently machined so as to have its ultimate
desired dimensions and configuration. Such a manufacturing
procedure, however, is cumbersome and always involves a consider-
able undesirable waste of material.
It is a primary object of the present invention to
provide a roll and roll-manufacturing method according to which
the above drawbacks are avoided.
Thus, it is an object of the present invention to
provide a method for manufacturing a roll of the above type
which has a substantially smooth exterior surface which may
be non-grooved.
Another object of the present invention is to extend
principles disclosed in the Canadian copending application
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N 237,581 to use in the manufacture of rolls which need not
have an exterior helical groove.
In particular, it i9 an object of the present inven-
tion to provide a roll of the above type with a relatively
smooth exterior surface in such a way that a strip which is
wound onto an inner roll body will not have any tendency to
have convolutions of the strip tilt away from other convulutions,
with all of the convolutions of such a strip pressing tightly
~- against each other to achieve a substantially smooth exterior
-~ 10 surface for such a roll.
It is an object of the present invention to provide
a method of the above type according to which the finish-
machining of the exterior surface of the completed roll can take
place during the time when a strip is wound onto an inner roll
body.
Also it is an object of the present invention to
provide a roll of the above type which will have desired proper-
ties in accordance with a suitable selection of the material for
a strip which is wound onto an inner roll body.
While reference is made below to a smooth-surfaced
covering for a roll, it is to he understood that such a s~ oth-
surface covering may include relatively shallow grooves, blind
holes, etc.
According to the present invention there is provided
in a method for manufacturing a roll, particularly of the type
- used in paper machines, the steps of rotating an inner roll
body around its axis, simultaneously winding onto an outer
surface of the inner roll body an elongated metal strip in a
manner forming from said strip on said outer surface of said
inner roll body a plurality of successive convolutions pressing
against each other and covering said outer surface of said
~ inner roll body at the area of said other surface where said
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strip i9 wound thereon, with said strip having an inner edge
surface engaging said outer surface of said inner roll body,
an outer edge surface distant from said inner roll body, and
opposed side surfaces which extend between said inner and outer
edge surfaces and which at each convolution engage over their
entire areas the side surfaces of adjoining convolutions over
the entire areas of the latter side surfaces, said strip having
at any instant during the winding thereof onto said inner drum
body an end convolution which has an inner side surface engaging
10 an adjoining side surface of the immediately preceding convolu-
tion and an outer side surface which is exposed at one end of
the series of convolutions which have already been wou~d, and
applying to said exposed outer side surface of said strip, during
the winding thereof onto said inner drum body, at a location
extending from said outer edge surface of said end convolution
inwardly toward but terminating short of said outer surface of
said inner drum body, a compressive force acting in the direction
of the axis of said drum body and pressing said end convolution
against the immediately preceding convolution with said com-
pressive force having a magnitude sufficiently great to deformand elongate said end convolution at a region thereof spac~d
; from said inner drum body where said force is applied to said
-` ` end convolution.
The invention is illustrated by way of example in
the accompanying drawings which form part of this application
s
and in which:
Fig. 1 is a schematic elevation illustrating one
possible method according to the invention;
Fig. 2 is a schematic partly sectional view of a series
of convolutions, Fig. 2 illustrating the manner in which a
compressive force is applied as well as how machining of the
exterior surface of the finished roll ~akes places; and
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10~;783
Fig. 3 is a sectional illustration of a strip of the
invention indicating in particular dimensional relationships
and the configuration of the cross section of the strip.
Referring now to the drawings, Fig. 1 schematically
illustrates an inner roll body 1 which is rotated about its
axis while an elongated metal strip Q i3 wound onto the inner
roll body 1 at an outer surface thereof. The inner roll body 1
may be fixed by way of journal pins at the ends thereof in a
lathe, for example, by means of which the inner roll body 1 is
rotated atout its axis. The roll body 1 will turn in a clock-
wise direction, as indicated by the arrow at the upper left
part of Fig. 1.
The lathe or the equivalent thereof has a conventional
carriage which is guided for movement in a direction parallel
to the axis about which the roll body turns, and this carriage
is fed automatically in synchronism with the rotation of the body
1 in a well known manner. The carriage carries structure for
straightening, braking, deforming and supporting the strip c~
~., .
which is wound onto-the body 1 at the exterior surface thereof,
.. ~
~, 20 the feed of the carriage being such that the convolutions of
` the strip ~ will be situated tightly against each other. ~Thus,
:
of the above structures, Fig. 1 illustrates the straightening
rollers 4 and the brake means 5, which are carried by the
carriage, the strip ~ being guided through the brake means 5
where a friction plate, for example, presses against the strip
a so as to create in the strip ~ a suitable tension as it is
wound onto the rotating roll body 1. Thus, during such winding
- of the strip a. onto the roll hody 1, the latter will be covered
at its outer surface at the area onto which the strip a is wound.
The carriage also carries a guide roller 6 which
guides the strip a onto the roll body 1 into engagement with
the immediately preceding convolution of the strip a which has
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107~783
been wound onto the roll body 1. Thus, the guide roller 6 has its
axis extending radially with respect to the axis of the body 1.
This guide roller 6 engages the strip a where it extends
tangentially with respect to the outer surface of the roll body
1 and just starts to bend and engage the outer surface of
the roll body 1.
As the strip turns beyond the guide roller 6, to
the left thereof as viewed in Fig. 1, it comes into engagement
with one or more deforming rollers 7 which also may be carried
by the carriage of the lathe and which press with a powerful
compressive force against the outer side surface of the strip
~, this outer side surface being visible in Fig. 1. Thus, at
any given instant during winding of the strip ~ onto the outer
surface of the roll body 1, the strip ~ will have an exposed
outer end surface 2 which is shown in Fig. 1, the opposed inner
side surface of the strip ~ at the end convolution thereof which
at any given instant is wound onto the body 1 pressing against
the immediately preceding convolution so that the end convolution
which is visible in Fig. 1 and which has the exposed outer side
surface 2 is situated at the end of the series of convolutions
which have already been wound onto the body 1. The carriage
carries a suitable hydraulic pressure unit, such as a suitable
piston and cylinder assembly, for example, cooperating with each
roller 7 to apply a powerful compressive force against the
exposed outer side surface 2 of the end convolution of the
strip ~ , this compressive force acting in a direction parallel
to the axis of the roll body 1 and having a magnitude which is
sufficiently great to deform and elongate the end convolution
at the part of the outer side surface 2 thereof which is engaged
by a roller 7. As a result of this action of the compression
rollers 7, the axes of which also extend radially with respect
to the axis of ~he roller body 1, the strip ~ readily curves
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to the curvature required by the outer surface of the inner
roll body 1, effectively engaging this outer surface of the
roll body 1 over the entire area thereof onto which the strip
~ is wound, with this elongation and deformation also causing
the convolution of the strip ~ to tend to tilt toward the
immediately preceding convolution, thus opposing any tendency
of a convolution to tilt in the opposité direction undesirably
away from the immediately preceding convolution.
As is most clearly apparent from Fig. 2, each com-
pression roller 7 engages the end convolution of the strip
at a part thereof which extends inwardly from an outer edge
surface of the strip q toward the roll body 1 but terminates
short of the latter so that the compressive force is applied
to the strip a at a location which is spaced outwardly beyond
the part of the strip Q which directly engages the outer surface
of the roll~body 1. The deforming and stretching or elongating
,,
of the outer part of the strip ~ is indicated for the end
convolution of Fig.2 by way of the hatching thereof which it
will be noted is denser toward the outer edge surface of the
end convolution which at any given instant is being wound
onto the roll body 1. As a result of this feature the outer
region of the strip ~ will be elongated to an extent greater
than the opposed inner edge surface thereof which directly
engages the exterior surface of the roll body 1 with the result
that not only does the strip a readily curve to the curvature
; of the outer surface of the roll body 1 but also it tends to
tilt or bend slightly toward the immediately preceding convolu-
tion, thus contributing in this way to a minimizing of the risk
.~
that any convolution will tilt away from the immediately
preceding convolution.
While Fig. 1 shows two compression rollers 7, depend-
ing upon the particular requirements there may be only one or
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~ 76783
more than two such rollers. The hydraulic units which
respectively cooperate with t~e rollers 7 to urge the latter
against the exposed outer side surface of the end convolution
are not illustrated.
Fig. 1 also shows a guide roller 8 which is supported
by the carriage and which assures that the part of the winding
which has already been completed will not become loose or spread
undesirably in the direction of the axis of the inner roll
body 1.
The brake means 5 are utilized so as to brake the
strip e in such a way that a suitable degree of tensile stress
is maintained in the strip a, thus assuring the tautness of
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~; the winding. This brake means 5 also may advantageously include
members capable of measuring and controlling the braking force.
As is indicated schematically in Fig. 2, prior to
the winding of the strip Q onto the roller body 1, there is
attached to the latter, at one end region thereof, for example,
a ring 3. Thus the ring 3 may, for example, be welded directly
to the body 1. Then a free end of the strip a is fixed to the
ring 3 at the right side surface thereof, as viewed in Fig. 2.
For example the free end of the strip ~ may be welded to the
ring 3. With the end of the strip ~ thus fixed to the ring 3,
the winding operations are started and progress as described
; above and shown in Figs. 1 and 2.
Figs. 2 and 3 illustrate the cross section of the
strip ~ . Thus, the radial dimension ~ of the strip ~ between
its outer edge surface 16 and its opposed inner edge surface
. .. .
which directly engages the outer surface of the body 1 is
several times greater than the thickness ~ of the strip a,
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this thickness being equal to the distance between the opposed
; side surfaces 14 and 15 of the strip Q .
The strip Q may be made of a material which is suit-
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1076783
able for the requirements of the roller which is to be manufac-
tured. For example, the strip ~ may be made of stainless steel.
Before the winding thereof it is already preworked 90 as to have
a proper profile or cross-sectional configuration. In the
illustrated example this profile is such that one of the side
surfaces, namely surface 14, is formed with an elongated bulge
10 extending longitudinally of the strip, while the opposed side
surface 15 is formed with a matching groove 11. As a result
of this arrangement, the side surface 15 of any convolution
will receive the bulge 10 of the next convolution in the groove
11 of the side surface, so that in this way the bulges and
grooves cooperate in the manner indicated in Fig. 2. This
`i construction assures a prevention of unwinding of the wound
strip even if for any reason it should rupture during use of
; the roll manufactured according to the invention.
As is apparent from Fig. 3, the cross section of the
strip ~ is substantially rectangular at least at its outer
region against which the compression roller 7 is pressed. It
will be noted that in the illustrated example, as shown in
` 20 Fig. 2, the compressive force is applied outwardly from the
groove 11 to the outer edge surface 16. Thus, disregarding the
bulge 10 and groove 11, the strip ~is of a substantially
rectangular cross section, although the thickness, if desired,
may taper slightly, so that the cross section may also be
slightly trapezoidal.
It will be seen that with the above-described method
of the invention, each convolution of the strip ~ engages at
its side surfaces 14 and 15, over the entire areas thereof, the
adjoining side surfaces of the adjoining convolutions also over
the entire areas of these adjoining side surfaces. As a result,
- the outer edge surface 16 of any one convolution is flush with
the forms an extension of the outer edge surfaces of the adjoin-
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:10'7~;~83
ing convolutions, and since this surface 16 is smooth, the
winding of the strip ~ onto the inner roll body 1 in accordance
with the invention will provide the roll body 1 with an exterior
smooth surface free of any grooves in the illustrated example.
For some purposes, however, slight grooves may be desirable,
and in this case the outer ed~e surface 16 may be slightly
concave so that a slight depression is formed therein between
the edges where the surfaces 14 and 15 intersect the outer edge
surface 16, or small blind bores may extend into the strip ~ from
its outer surface 16 through a relatively short distance.
Constructions of this latter type are also considered as forming
a smooth surface for the roll body. Thus, it is possible to
; provide the finished roll with a smooth surface 12 which is
indicated in Fig. 2, and desired properties can be provided in
accordance with the choice of material of the strip C~, such as
suitable corrosion-resisting characteristics by properly select-
ing the material of the strip q .
Inasmuch as the outer surface of the inner roll body
1 is previously machined in a highly accurate manner so as to
be finished with precise dimensions, and inasmuch as the strip
C is very precisely manufactured, it is possible by way of the
method of the invention to obtain for the completed roll an-
exterior surface 12 which not only smooth but which also has
closely and precisely determined dimensions.
Moreover, with the method of the invention it is
possible to carry out the final finish-machining of the surface
12 while the strip ~ is wound onto the body 1. This finish-
machining step is schematically indicated in Fig. 2 by way of
a roll 13 which is fragmentarily illustrated and which has an
outer surface engaging the surface 12 so as to provide the
latter with a predetermined finish as desired.
.
The method of the invention for covering the roll
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~076783
body 1 with the wound strip ~ may be completed in any suitable
way. For example after the roller 7 are displaced away from
the final convolution, a second ring 3 is placed on the body 1
and welded to the latter as well as to the final convolution.
Of course such a ring 3 will be pressed with a compressive force
against this final convolution so that when such a ring 3 is
welded to the body 1 and to the final convolution, all of the
`~ convolutions will be maintained tightly pressing against each
other.
10It is thus apparent that with the method of the inven-
tion waste of expensive profile strip material will be reduced
to a minimum and in addition the roll is manufactured quickly
and inexpensively without sacrificing precision or high quality.
Of course, the invention includes not only the method
referred to above and shown in the drawings but also the roll
which is manufactured by this method.
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