||Walze sowie Feder dafür
||Sandvik Intellectual Property AB, Sandviken, SE
||Vlk, Jaroslav, 8610 Uster, CH;
Gleizer, Jorge, 124 72 Bandhagen, SE;
Andersson, Jerker, 811 92 Sandviken, SE
||derzeit kein Vertreter bestellt
||AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HU, IE, IS, IT, LI, LT, LU, LV, MC, NL, PL, PT, RO, SE, SI, SK, TR
|Sprache des Dokument
|Veröffentlichungstag im Patentblatt
B21B 27/03(2006.01)A, F, I, 20061121, B, H, EP
Technical Field of the Invention
In a first aspect, this invention relates to a roll of
the type that comprises a roll shaft and two axially spaced-apart stop rings, one
of which is fixed and the other one is a lock nut, a plurality of other rings in
the form of roll rings and/or spacer rings being mounted between the stop rings,
as well as at least one spring that has two axially spaced-apart ends.
In a second aspect, the invention relates to a spring as
In rolls of the kind generally mentioned above - which
by those skilled in the art are referred to as combi rolls - it is important that
the roll rings are kept pressed in close contact against occurring spacer rings
in order for the rings not to slip in relation to each other. For this purpose,
solely the lock nut itself is inadequate, and therefore it is necessary to arrange,
in the set of rings, at least one powerful spring, which for a long time continuously
can apply a spring prestress to the rings. For this purpose, Belleville springs,
among others, have previously been used (see, for instance,
). However, for many different reasons, the use of Belleville springs has
not been successful. One of these reasons is that such springs have a tendency to
slacken or be fatigued too fast. Another reason is that a Belleville spring only
has line contact with adjacent rings and not surface contact.
Objects and Features of the Invention
The present invention aims at obviating the spring prestress
problems that are involved with previously known roll and springs associated thereto,
and at providing an improved roll and spring, respectively. Therefore, a primary
object of the invention is to provide a spring suitable for combi rolls that is
powerful and has a long service life, in so far that it should be able to work in
a powerful way for a long time without slackening. An additional object is to provide
a spring that has a short stroke or spring length and in spite of this generates
considerable, dynamic spring forces. An additional object of the invention is to
provide a spring which has a moderate axial extension in order not to intrude unnecessarily
on the available space (roll width) between the stop rings. Furthermore, the invention
aims at providing a spring that guarantees surface contact with adjacent rings rather
than line contact.
According to the invention, at least the primary object
is attained - in a first aspect - by a roll of the type defined in the independent
claim 1. An advantageous embodiment of the roll according to the invention is further
defined in the dependent claim 2.
In another aspect, the invention relates to a roll spring
as such. The vital features of this spring are found in the independent claim 3.
Preferred embodiments of the spring according to the invention are further defined
in the dependent claims 4-10.
Brief Description of the Appended Drawings
In the drawings:
Detailed Description of a Preferred Embodiment of the Invention
- Fig. 1
- is a partial longitudinal section through a combi roll in which a spring according
to the invention is included,
- Fig. 2
- is a perspective view of solely the spring,
- Fig. 3
- is an end view of the spring, and
- Fig. 4
- is an enlarged longitudinal section A-A in Fig. 3.
In Fig. 1, reference numeral 1 designates a drivable roll
shaft that has a rotationally symmetrical basic shape, and is provided with two
axially spaced-apart stop rings 2, 3, one of which, viz. the ring 2, is fixed, while
the other one is a lock nut 3. The fixed stop ring 2 may either be made in the form
of a ring-shaped shoulder of the shaft, as shown in Fig. 1, or be made in the form
of a separate ring (not shown) which is detachably mounted on the shaft, although
axially locked in relation to the same. The detachable lock nut 3 is connected to
the shaft via a threaded joint 4 which includes a female thread on the inside of
the nut ring and male thread on the shaft.
Between the stop rings 2, 3 a set of detachable rings is
arranged, of which certain are roll rings 5, and others are spacer rings 6. A special
spacer ring 6A is inserted between a roll ring 5 and a ring-shaped spring designated
7. Generally, all rings have a rotationally symmetrical, more precisely cylindrical,
basic shape, so far that they are delimited between, on one hand, external and internal
cylinder surfaces 8, 9 and, on the other hand, opposite, planar end surfaces 10.
The cylinder surfaces 8, 9, which usually are machined by turning, are defined by
the centre axis C of the shaft.
Figs. 2-4 illustrate the nature of the spring 7 in detail.
In Fig. 2, it is seen that also the spring 7 has a rotationally
symmetrical basic shape determined by external and internal cylinder surfaces 11,
12 concentric with the centre axis C (in the mounted state, the centre axis of the
spring ring coincides with the centre axis of the roll shaft 1). Furthermore, the
spring body is delimited by opposite, axially spaced-apart ends 13, 14 that are
generally ring-shaped. In order to provide conceptual clarity in the description
to follow, the ends are referred to as front and rear, respectively. However, these
are related only to Fig. 2, where the end 13 is shown in front and the end 14 at
As is seen in Fig. 4, a number of slots or gaps 15 opens
in the front end 13 of the spring body, which slots extend towards the rear end
14, without reaching up to the same. In the example, the number of forward opening
slots 15 amounts to two. In such a way, the slots 15 separate in total three different
laminae 16, 17, 18, each one of which has a free end surface 19, 20, 21.
Each slot 15 is delimited by two spaced-apart cylinder
surfaces 22, 23 which are concentric and end in a bottom 24.
In the rear end 14 of the spring body, two similar, second
slots 25 open, which extend towards the front end 13, without reaching up to the
same. In the same way as the slots 15, the slots 25 separate three rearward-facing
laminae 26, 27, 28. The end surfaces of the same three laminae are designated 29,
30, 31. Also the slots 25 are defined by cylindrical, concentric limiting surfaces
32, 33 which end in bottoms 34.
In Fig. 4, L1 designates the total length or axial extension
of the spring body, while L2 designates the length or depth of the individual slot
25. Advantageously, all four slots, i.e., also the slots 15, have one and the same
depth L2. Although it is possible to vary the depth of the slots within fairly wide
limits, and thereby vary the properties of the spring, the depth L2 should amount
to at least 60 % of the total length L1 of the spring body. On the other hand, the
slot depth L2 should not exceed 90 % of the length L1.
The individual slot 15 is advantageously located about
halfway between the two adjacent slots 25. The two outer forward-facing laminae
17, 18 have a material thickness (such as this is determined by the difference between
the outer diameter and the inner diameter) twice as large as the corresponding material
thickness of the inner forward-facing lamina 16. Conversely, the outer rearward-facing
lamina 28 has a material thickness that is half as large as the material thickness
of the two inner rearward-facing laminae 26, 27.
In accordance with a vital feature of the invention, one
of the end surfaces of each end of the spring body is axially displaced in relation
to the end surface of one or more adjacent laminae. Thus, as is clearly seen in
Fig. 4, the end surface 19 of the intermediate forward-facing lamina 16 is axially
displaced (forwardly) in relation to the end surface 20 of the nearest lamina 17.
Furthermore, in the example, the end surface 20 of the lamina 17 is axially displaced
forwardly in relation to the end surface 21 of the outermost lamina 18. In the unloaded
state of the spring, such as shown in Fig. 4, the displacements are designated S1
and S2, respectively. In practice, these may be within the range of 0,2-2 mm, suitably
0,4-1 mm, on the assumption that the spring body has such dimensions that the difference
between the outer diameter D1 and the inner diameter D2 is within the range of 20-50
mm, and the total length L1 within the range of 60-120 mm.
In an analogous (although reversed) way, the end surfaces
29, 30, 31 are axially displaced in steps in relation to each other with S1, S2.
In practice, the displacements S1, S2 at the end 14 may be mutually equally large,
as well as equally large as the corresponding S1, S2 at the opposite end 13.
According to the invention, at least those end surfaces
19, 31 that form the contact surfaces of the spring body against adjacent rings
in the roll are made having planar shape. For practical reasons of manufacture,
also the other end surfaces 20, 21; 29, 30 may be planar.
The described spring body may advantageously be manufactured
in one single piece of, for instance, metal, such as steel. By machining (turning,
milling and/or hollow drilling) a ring-shaped blank of, for instance, steel having
suitable elasticity properties, it is accordingly possible to produce springs that
can provide for highly varying demands concerning spring force, spring length, dimensions,
In Fig. 1, the spring 7 is shown mounted between the lock
nut 3 and the spacer ring 6A, the planar end surface 31 of the spring being pressed
against the likewise planar end surface of the inside of the lock nut 3, while the
end surface 19 is pressed against the planar end surface of the spacer ring 6A.
When the lock nut is tightened, the spring is supplied with counter-directed axial
forces that generate labyrinth-shaped trains of spring forces inside the spring
body, more precisely between the end surfaces 19, 31, the spring body being compressed
by elastic deformation of the same, above all in the U-shaped portions of the laminae
adjacent to the slot bottoms 24, 34. Dependent on the size of the clamping force,
the end surfaces 19, 31 will move somewhat inwardly in relation to the adjacent
end surfaces 20, 30 that in turn can move inwardly in relation to the end surfaces
21, 29. Even if the deformation and displacement motions are small, a considerable
spring force will be generated in the spring.
In Fig. 1, one of a plurality of tightening devices 35,
e.g., screws, is shown arranged in a rim formation around the lock nut, which tightening
devices may be utilized in order not only to initially adjust the spring-tension,
but also if required readjust the same.
Feasible Modifications of the Invention
The invention is not limited to the embodiment described
above and shown in the drawings. Thus, the placing of the spring in the set of rings
is not limited to the immediate vicinity of the lock nut. The essential thing is
that the spring is active in the set of rings of the roll shaft. Furthermore, the
spring itself may be realized in another way than in the form of a body shaped in
one single piece. Thus, it is possible to assemble the spring body of two or more
separate components. These can be permanently united to each other in a suitable
way but they can also be present as individual pieces. It is also feasible to manufacture
the spring of other materials than steel or metal. Furthermore, the number of laminae,
and the number of separating slots, respectively, may be varied most considerably
within the scope of the subsequent claims. However, at least one slot has to open
in one end of the spring body and at least one slot in the opposite end.
A roll comprising a roll shaft (1) and two axially spaced-apart stop
rings (2, 3), one of which (2) is fixed and the other one is a lock nut (3), a plurality
of other rings in the form of roll and/or spacer rings being mounted between the
stop rings (2, 3), as well as at least one spring (7) delimited by two axially spaced-apart
ends (13, 14), characterized in that, in a front end (13) of the spring (7),
at least one first slot (15) opens which extends towards the rear end (14) without
reaching the same, and which separates two forward-facing laminae (16, 17) having
ring-shaped end surfaces (19, 20), which in the rear end (14) at least one second
slot (25) opens which extends towards the front end (13) without reaching the same,
and which separates two rearward-facing laminae (27, 28) having ring-shaped end
surfaces (30, 31), and that at each one of the ends (13, 14) of the spring body,
an end surface (19, 31) protrudes axially in relation to the end surface (20, 30)
of an adjacent lamina, the protruding end surfaces (19, 31) at the opposite ends
of the spring being pressed against end surfaces (10) of adjacent rings (6A, 3).
Roll according to claim 1, characterized in that the ring-shaped
end surface (19, 31) of the individual lamina (16, 28) is planar and extends perpendicularly
to an axial extension (C) of the spring, also the end surfaces of the adjacent rings
(6A, 3) being planar and extending perpendicularly to the axial extension thereof.
Spring for roll, comprising a ring-shaped body which is manufactured
of an elastic material and has two axially spaced-apart ends (13, 14),
characterized in that, in a front end (13) of the body, at least one first
slot (15) opens which extends towards the rear end (14) without reaching the same,
and which separates two forward-facing laminae (16, 17), having ring-shaped end
surfaces (19, 20), that in the rear end (14) at least one second slot (25) opens
which extends towards the front end (13) without reaching the same, and which separates
two rearward-facing laminae (27, 28), having ring-shaped end surfaces (30, 31),
and that at each one of two ends of the body, an end surface (19, 31) of a lamina
(16, 28) protrudes axially in relation to the end surface (20, 30) of an adjacent
lamina (17, 27).
Spring according to claim 3, characterized in that the end surface
(19, 31) of the individual lamina (16, 28) is planar and extends perpendicularly
to the axial extension (C) of the spring.
Spring according to claim 3 or 4, characterized in that the axial
length (L2) of the slot (15, 25) amounts to at least 60 % of the length (L1) of
the spring body.
Spring according to any one of claims 3-5, characterized in that
the axial length (L2) of the slot (15, 25) amounts to at most 90 % of the length
(L1) of the spring body.
Spring according to any one of claims 3-6, characterized in that,
in each end (13, 14) of the spring body, two or more slots (15, 25) open that separate
three or more laminae (16, 17, 18; 26, 27, 28).
Spring according to any one of claims 3-7, characterized in that
the same has a flat shape so far that the axial length (L1) between opposite ends
(13, 14) thereof is less than the outer diameter (D1).
Spring according to any one of claims 3-8, characterized in that
the same is one single piece of metal.
Spring according to any one of claims 3-8, characterized in that
the same is more than one single piece of metal.
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