U.S. patent number 3,667,096 [Application Number 05/087,008] was granted by the patent office on 1972-06-06 for roll device.
This patent grant is currently assigned to Sandvikens Jernverks Aktiebolag. Invention is credited to Kurt G. Edsmar.
United States Patent |
3,667,096 |
Edsmar |
June 6, 1972 |
ROLL DEVICE
Abstract
A roll, for rolling metals or for grinding, comprises (1) a roll
ring formed of a metal carbide, on (2) a metallic holder or support
means, which latter means consists essentially in a flanged sleeve,
on which the roll ring is disposed, with one side face of the same
abutting against a peripheral part of the flange of the sleeve, and
a co-operating flanged muff threaded onto the sleeve and having a
peripheral part abutting against the other side face of the roll
ring. Said flanges are so profiled as to leave annular slits on
either side of the roll ring, in which slits there is provided a
suitable adhesive substance "glueing" the roll ring to the flanges
of the support means.
Inventors: |
Edsmar; Kurt G. (Huddinge,
SW) |
Assignee: |
Sandvikens Jernverks Aktiebolag
(Sandviken, SW)
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Family
ID: |
20296306 |
Appl.
No.: |
05/087,008 |
Filed: |
November 4, 1970 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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760459 |
Sep 18, 1968 |
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Foreign Application Priority Data
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Sep 18, 1967 [SW] |
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12795/67 |
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Current U.S.
Class: |
492/1;
492/40 |
Current CPC
Class: |
F16C
13/00 (20130101); B21B 27/035 (20130101); B02C
4/30 (20130101); F16C 2322/12 (20130101) |
Current International
Class: |
F16C
13/00 (20060101); B02C 4/00 (20060101); B02C
4/30 (20060101); B21B 27/02 (20060101); B21b
031/08 () |
Field of
Search: |
;29/123,125
;51/206.4,206.5,207 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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319,200 |
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Sep 1929 |
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GB |
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599,508 |
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Oct 1925 |
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FR |
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1,815,812 |
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Jun 1970 |
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DT |
|
Primary Examiner: Guest; Alfred R.
Parent Case Text
This application is a continuation of application, Ser. No. 760,459
filed Sept. 18, 1968 which is now abandoned.
Claims
I claim:
1. Roll for rolling, grinding, crushing and the like which
comprises
a roll ring holder having two spaced flanges;
a roll ring between the two flanges on the roll ring holder,
the roll ring and the flanges having matching contact surfaces in
the main shaped as surfaces of revolution directed transversely to
the axis of rotation of the roll;
means for clamping the roll ring between the flanges;
at least one of said contact surfaces having (a) raised portions
which abut against the cooperating contact surface and (b)
depressed portions which are somewhat spaced from the cooperating
contact surface forming a thin slit therewith, and
binder material in said slit,
the roll ring thus being torsionally fixed between the flanges of
the roll ring holder solely by the clamping contact between the
surface of revolution and the adhesion of the binder material.
2. Roll for rolling, grinding, crushing and the like which
comprises
a roll ring holder having two spaced flanges;
a roll ring clamped between the two flanges on the roll ring
holder,
the roll ring and the flanges having matching contact surfaces
shaped as surfaces of revolution directed transversely to the axis
of rotation of the roll;
means for clamping the roll ring between the flanges;
at least one intermediate spacing member disposed between said
congruent contact surfaces and forming between the latter a thin
slit; and
binder material in said slit,
the roll ring being thus torsionally fixed between said flanges of
the roll ring holder by the combined action of the clamping means
and of the binder material, the torsional fixation being obtained
exclusively by the clamping contact between the surfaces of
revolution and the adhesion of the binder.
3. Roll as defined in claim 1, in which the holder device at the
same time forms part of the roll shaft of the roll.
4. Roll as defined in claim 1, in which at least one of the
flanges, between which the roll ring is mounted, has that annular
surface thereof which faces the roll ring formed with a
peripherically situated annular surface portion, which surface
portion is somewhat raised in the axial direction over the annular
surface portion that is situated closer to the center, so that the
peripherically situated surface portion abuts against the roll
ring, while the surface portion that is situated closer to the
center is separated from the roll ring by a slit, which slit
contains an adhesive.
5. Roll as defined in claim 1, in which the thickness of the glue
joint is 0.01-0.25 mm.
Description
The present invention relates in the first place to rolls for
rolling of metals but also to rolls for other purposes, for
instance grinding, crushing, etc., the rolls being composed of one
or more roll rings, on which the surface for working the material
is situated, and a holder part which carries the roll ring or
rings, and which can be the roll shaft itself or can be an annular
device mounted on the roll shaft.
The purpose of a compound or built-up roll of this sort is usually
to be able to use different materials in the roll ring and the
holder part, each being made of a material suitable for its
function. In doing so, it is usual to make the roll ring or rings
of sintered metal carbide and the holder part of steel. Sintered
carbide is very suitable for the contact with the material to be
worked, as it is hard and has a high wear resistance. Because
sintered metal carbide is relatively brittle, it is highly
desirable to, if possible, avoid tensile stresses in the material
which for instance can be done by forming the roll ring, so that
the forces acting thereon do not act in such a direction that the
tensile stresses are increased, or by pre-tensioning it so that it
initially is subjected to compressive stresses which more or less
counterbalance the influence of such forces that raise the tensile
stress.
In prior compound rolls the roll ring and its holder have often
been provided with cooperating protrusions and recesses in order to
involve the roll ring in the rotation of the holder, for instance
fixed connections of the claw coupling type and wedge connection
type. These modes of coupling cause local tensile stresses in the
roll ring, and, moreover, substantially increase the manufacturing
cost.
The present invention relates to an improvement in the construction
of a compound roll of the type above referred to, characterized by
the feature that the roll ring is fastened by means of an adhesive
joint at at least one of the two annular holder parts between which
it is attached. By making one or both of the co-operating holder
parts threaded it is possible to introduce axial compressive
stresses in the ring at the time of mounting the roll ring by
tightening the co-operating threaded parts thereby counteracting
axial tensile stresses which may arise during operation of the
roll.
The invention will now be described with greater particularity with
reference to the following specific disclosure and to the appended
drawing, in which
FIG. 1 shows a section, in the axial plane, of a roll constructed
according to the invention;
FIG. 2 illustrates the concept of mounting the roll ring directly
on the roll shaft; and
FIG. 3 shows how a plurality of roll rings may be secured together
into one composite roll ring.
The roll shown in FIG. 1 consists of a roll ring 10, which is
mounted on a holder 11. The holder consists of a bushing sleeve 13,
which at one end has a fixed flange 14 and at its other end has a
thread 15, on which is threaded a separate flange in the form of a
flange muff 12. The roll ring 10 clamped between the flanges 12 and
14, and its cylindrical inside is suitably shaped to precisely
match the external cylindrical surface of the bushing sleeve 13,
whereby the roll ring is held centered. The holder is adapted to be
mounted on a conventional roll shaft (indicated at 16) and driven
for instance by clamping or by a key and slot connection with the
shaft. The flanges may alternatively be mounted directly on the
roll shaft which then substitutes the bushing sleeve 13.
The flanges 12 and 14 have at their inner sides adjacent the
periphery inwardly raised portions 17 and 18 which abut against the
roll ring 10. In this way there are formed slit-shaped spaces 19
and 20 between the roll ring and the flanges at the inside of the
portions 17 and 18.
The compressive force arising between the flanges 12 and 14 and the
roll ring 10 provides not only the hereinabove mentioned axial
pre-tension but also a certain frictional force which counteracts
the turning of the roll ring on the holder. This friction force is,
however, not sufficient for ensuring that the roll ring positively
rotates with the holder when rolling. As above stated, driving
means previously have been used in the form of cooperating
projections and recesses. According to the present invention, a
sufficient fastening to ensure positive driving of the roll ring is
obtained by applying an adhesive between the roll ring 10 and at
least one of the flanges 12 and 14. The adhesive is applied in the
spaces 19 and 20. In order to stabilize the construction adhesive
can suitably be applied also on the thread 15.
In FIG. 2 another embodiment of the invention is shown, where the
roll ring 10 is mounted directly on the roll shaft 26. The roll
ring is as in FIG. 1 embraced by two flanges, one of which 27 is
integral with the shaft, the other 28 forming a separate sleeve on
the shaft and clamped by a ring 29 and screws 30. Also in this
embodiment the flanges have raised portions 31, 32 on the surfaces
that face the ring, so that slits 33, 34 are formed, but in this
case the slits are situated peripherically. This has the advantage
that in case the carbide ring breaks during rolling, the adhesive
in the slits will aid in preventing the pieces from flying
about.
FIG. 3 illustrates how a number of roll rings 40, 41, 42 and 43 can
be clamped together between two flanges 44 and 45. As earlier
described there are raised portions 46 and 47 on the flanges and
corresponding slits 48 and 49. Between the rings there are shims 50
forming slits 51 for an adhesive.
Instead of the illustrated annular raised portions on the flange
surfaces facing the roll rings there may be an arbitrary pattern of
raised portions, for instance radial, forming a corresponding
pattern of slits for the adhesive. Instead of having the raised
portions on the flanges it is possible to have them on the roll
rings, but this is in general more inconvenient, as the carbide in
the ring is more difficult to shape.
Instead of having raised portions integral with the flange or the
roll ring the desired slit between a flange and a roll ring may be
obtained by separate distance pieces as shown at 50 between the
rings in FIG. 3. In this case the facing annular surfaces on the
ring and the flange are both plane, and a distance piece in the
form of an annular plate or thread is inserted between the
surfaces. It has been found suitable to use a thread of tungsten or
molybdenum between the annular surfaces, because said materials are
not easily deformed by the clamping forces.
The described roller is intended for cold or hot rolling of wire or
rods. In order to prevent the destruction of the adhesive joint by
the heat in hot rolling, it is essential that the rolls are cooled
during the rolling, so that the temperature is held relatively low,
and preferably does not exceed 100.degree. C. The cooling is
important also in order to prevent the sintered carbide ring from
bursting because steel has a higher coefficient of thermal
expansion than does sintered carbide. In the illustrated case, the
roll ring 10 is mounted with accurate fit on the bushing sleeve 13,
which in turn is mounted on a common homogeneous steel shaft. By
strong heating of the whole structure the roll ring might
burst.
For bonding the rolling ring to the holder means there is used a
type of adhesive which is suitable for joining together the actual
materials. For bonding sintered metal carbide to steel there can be
used organic adhesives such as hardenable plastics (e.g., phenolic
resin glue, epoxy resin glue and glue having an isocyanate base;
also, as well, there can be used mixtures such as epoxy-silicon
glue or epoxy-phenyl glue), or thermoplastics (e.g. vinyl resin),
or elastomers (e.g. chloroprene, nitrile rubber), or mixtures of
two types of glue such as hardenable plastic and thermoplastic
(e.g. phenol-vinyl resin) or hardenable plastic and elastomer (e.g.
phenol-nitrile rubber). Also inorganic glues can be used, as for
instance silicate glue (waterglass-asbestos). Moreover mixtures of
organic and inorganic glues can be used, as oxide of lead and
polyvalent alcohols. In connection with the illustrated specific
example, an adhesive containing in the main a hardenable epoxy
resin has been found particularly suitable. It is cured at
100.degree.-200.degree. C. and retains its strength excellently at
up to 150.degree. C and to some extent at 200.degree.-250.degree.
C. Both heat-hardenable and cold-hardenable types of adhesive may
be used.
The thickness of the adhesive joint should be 0.01-0.25 mm, the
lower limit being in the illustrated embodiment suitably 0.05 mm,
while the upper limit can be 0.20 mm, preferably 0.10 mm. In the
illustrated case the thickness of the joint is equal to the
thickness of the slits 19 and 20.
* * * * *