U.S. patent application number 13/714685 was filed with the patent office on 2013-06-20 for angle-profile rolling method and apparatus.
The applicant listed for this patent is Thomas Kosak, Michael Minnerop, Thomas Nerzak, Juergen Roettger. Invention is credited to Thomas Kosak, Michael Minnerop, Thomas Nerzak, Juergen Roettger.
Application Number | 20130152653 13/714685 |
Document ID | / |
Family ID | 47227406 |
Filed Date | 2013-06-20 |
United States Patent
Application |
20130152653 |
Kind Code |
A1 |
Kosak; Thomas ; et
al. |
June 20, 2013 |
ANGLE-PROFILE ROLLING METHOD AND APPARATUS
Abstract
A rolling apparatus for rolling angle profiles from rolling
stock has upper and lower horizontal profile rolls rotatable about
respective parallel upper and lower axes and together defining an
open or closed roll gap that lies in a rolling plane perpendicular
to a travel direction of the rolling stock. At least one pair of
nonhorizontal edging rolls laterally compress the rolling stock and
define a rolling plane extending perpendicular to the travel
direction of the rolling stock. The rolling plane defined by the
profile rolls and the rolling plane defined by the pair of edging
rolls are not coplanar with each other. This rolling stand can do
angle rolling in reversing and also continuous operating mode.
Inventors: |
Kosak; Thomas; (Neuss,
DE) ; Minnerop; Michael; (Ratingen, DE) ;
Roettger; Juergen; (Hohenwarsleben, DE) ; Nerzak;
Thomas; (Gelsenkirchen, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Kosak; Thomas
Minnerop; Michael
Roettger; Juergen
Nerzak; Thomas |
Neuss
Ratingen
Hohenwarsleben
Gelsenkirchen |
|
DE
DE
DE
DE |
|
|
Family ID: |
47227406 |
Appl. No.: |
13/714685 |
Filed: |
December 14, 2012 |
Current U.S.
Class: |
72/225 |
Current CPC
Class: |
B21B 1/10 20130101; B21B
1/088 20130101; B21B 1/00 20130101; B21B 13/12 20130101 |
Class at
Publication: |
72/225 |
International
Class: |
B21B 1/00 20060101
B21B001/00 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 16, 2011 |
DE |
102011121512.7 |
Claims
1. A rolling apparatus for rolling angle profiles from rolling
stock, the apparatus comprising: upper and lower horizontal profile
rolls rotatable about respective parallel upper and lower axes and
together defining an open or closed roll gap that lies in a rolling
plane perpendicular to a travel direction of the rolling stock; and
at least one pair of nonhorizontal edging rolls that laterally
compress the rolling stock and define a rolling plane extending
perpendicular to the travel direction of the rolling stock, the
rolling plane defined by the profile rolls and the rolling plane
defined by the pair of edging rolls are not coplanar with each
other.
2. The rolling apparatus defined in claim 1, wherein viewed in the
travel direction of the rolling stock, the rolling plane defined by
the pair of edging rolls is downstream of the rolling plane of the
profile rolls.
3. The rolling apparatus defined in claim 1, wherein, relative to
the travel direction of the rolling stock, the rolling plane
defined by the pair of edging rolls is upstream of the rolling
plane of the profile rolls.
4. The rolling apparatus defined in claim 1, wherein the apparatus
can be used for continuous or reversible rolling.
5. The rolling apparatus defined in claim 1, further comprising: a
common stand carrying both the profile and edging rolls.
6. The rolling apparatus defined in claim 1, wherein the angle
profile has a cross section with identical legs.
7. The rolling apparatus defined in claim 1, wherein the angle
profile has a cross section with unequal legs.
8. The rolling apparatus defined in claim 1, wherein the at least
one pair of edging rolls can be positioned at a spacing from each
other that is smaller than an axial barrel dimension of the profile
rolls.
9. The rolling apparatus defined in claim 1, wherein the edging
rolls have over at least part of their axial lengths shapes that
are designed in pairs of similar shape.
10. The rolling apparatus defined in claim 9, wherein the angle
profile has a leg tip radius shape with natural or rounded
edges.
11. The rolling apparatus defined in claim 1, wherein the edging
rolls can be positioned independently of each other can be
positioned with respect to the rolling stock such that rotation
axes of the edging rolls have an angular offset of up to 90.degree.
to the respective longitudinal axes of the profile rolls.
12. A compact or tandem group, comprising at least one rolling
apparatus defined in claim 1.
13. In a method of making angle profiles using a rolling apparatus
having an upper and a lower horizontal profile roll rotatable about
respective parallel upper and lower axes and together defining an
open or closed roll gap that lies in a rolling plane perpendicular
to a travel direction of the rolling stock; and at least one pair
of nonhorizontal edging rolls that laterally compress the rolling
stock and define a rolling plane extending perpendicular to the
travel direction of the rolling stock, the rolling plane defined by
the profile rolls and the rolling plane defined by the pair of
edging rolls are not coplanar with each other, the step of, prior
to or after passing the rolling stock through the horizontal
profile rolls, deforming the rolling stock by at least one pair of
nonhorizontal edging rolls.
14. The method defined in claim 13, wherein when using profiled
edging rolls, the entire forming process of the rolling stock
including finish rolling after rough rolling takes place in a rough
rolling stand by the horizontal profile rolls and the edging rolls
and by using a pair of horizontal edging rolls.
15. The method defined in claim 13, wherein the entire forming
process of the rolling stock including finish rolling after rough
rolling takes place in a rough rolling stand by the horizontal
profile rolls and the edging rolls, and by using a finishing stand.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to rolling angle profiles.
More particularly this invention concerns a method of and apparatus
for rolling angle iron, typically of steel.
BACKGROUND OF THE INVENTION
[0002] A standard apparatus for rolling angle profiles from rolling
stock has an upper horizontal profile roll and a lower horizontal
profile roll that rotate about respective upper and lower
horizontal and parallel axes and that together define an open roll
gap or pass that lies in a rolling plane perpendicular to the
travel direction of the rolling stock and that normally includes
the rotation axes of the horizontal rolls. At least one
nonhorizontal pair of edging rolls laterally compress the rolling
stock and define a rolling plane also extending perpendicular to
the travel direction of the rolling stock and perpendicular to the
plane of the gap of the horizontal rolls. Such angle profiles, for
example, may have equal or unequal legs, and the like.
[0003] With a so-called duo rolling method as described in U.S.
Pat. No. 4,791,799 uses universal rolling stands, optionally in
reverse rolling mode, used for forming a profile of the desired
cross section. This system has a reversing two-high rough rolling
mill, at least one universal working rolling mill and at least one
flanging edge-rolling mill included in a reversing tandem rolling
mill group, and a universal finishing rolling mill at the outlet
end of the structural steel rolling mill. The reversing tandem
group following the rough rolling mill has a universal working
rolling mill, a flanging edge-rolling mill and the universal
finishing rolling mill. By including the universal finishing
rolling mill in the reversing tandem rolling mill group the
universal finishing rolling mill also participates in the reversing
action and because of that is more effective in shaping than the
standard finishing rolling mill so that in practice the special
universal finishing rolling mill following the reversing tandem
group is omitted as well as the edge-rolling mill commonly provided
with it and the roller bed located between them. The dimensional
accuracy and the surface properties of the rolled product as well
as the service life of the rolls of the universal finishing rolling
mill are not impaired when the reduction of the universal finishing
rolling mill is set smaller than that of the universal working
rolling mill.
[0004] Using multiple successively arranged universal rolling
stands for making double T-beam profiles is also disclosed, for
example, in U.S. Pat. No. 3,251,213.
[0005] Although the use of duo or universal rolling stands for
rolling angle profiles from preliminary profiles usually having
square or rectangular cross sections is considered advantageous
with regard to shape and dimensional accuracy of the generated
angle profile, these stands with substantially horizontal work
rolls are disadvantageous with regard to the flexibility of making
different profiles and with regard to the number of forming gaps
required for the forming process, which disadvantages result in
high costs for making different angle profiles. In fact, it is
typical for all methods using closed grooving that depending on the
size of the angle in the angle profile, five to nine forming gaps
are needed so as to generate an angle profile from a rectangular
cross section.
[0006] The required gaps need a considerable roll barrel length and
can only be used in limited leg thickness ranges. However, many
angle profiles are made with different leg thicknesses, thereby
further increasing the necessary number of gaps and thus the costs
for rolls. Thus, in practice attempts were already made to improve
the process of angle rolling in rolling mills in that on a duo
roughing stand, a rectangular initial pass section having a small
angle or a preprofiled initial pass section having a comparatively
large angle is generated that then usually is formed in three
cycles in the same gaps of a duo-uni-duo group until the
approximate leg thickness of the finished angle is reached, and is
finally formed in a separate duo finishing gap so as to obtain the
finished angle dimension.
[0007] However, a disadvantage of this is that in the case of such
a rolling setup, the edging stand usually designed as a simple duo
stand has to be designed as a comparatively cost-intensive
universal stand. Another major disadvantage of this universal
rolling method is that the large, nondriven vertical rolls have to
be driven by the horizontal rolls of the edging stand. For this
reason it is also necessary to roll a web reduction in the edging
stand resulting in thickened ends of the generated profile in the
vertical roll gaps. These thickened parts are in turn also
increased through the required edging for small leg thicknesses and
the associated expansion of the rolling stock. Finally, with such a
form of the universal rolling method it is not possible to set
predetermined radii on the leg tips of the angle legs in a defined
and controlled manner.
OBJECTS OF THE INVENTION
[0008] It is therefore an object of the present invention to
provide an improved angle-profile rolling system.
[0009] Another object is the provision of such an improved
angle-profile rolling system that overcomes the above-given
disadvantages, in particular that it is possible in a simpler and
improved manner in rolling trains, in reversing or continuous
arrangement, to generate profiles within the tolerances and within
a wide dimensional range and that have equal and unequal angle legs
with optionally different thicknesses of the two legs.
SUMMARY OF THE INVENTION
[0010] A rolling apparatus for rolling angle profiles from rolling
stock has according to the invention upper and lower horizontal
profile rolls rotatable about respective parallel upper and lower
axes and together defining an open or closed roll gap that lies in
a rolling plane perpendicular to a travel direction of the rolling
stock. At least one pair of nonhorizontal edging rolls laterally
compress the rolling stock and define a rolling plane extending
perpendicular to the travel direction of the rolling stock. The
rolling plane defined by the profile rolls and the rolling plane
defined by the pair of edging rolls are not coplanar with each
other. This rolling stand according to the invention can do angle
rolling in reversing and also continuous operating mode.
[0011] Preferably, the invention enables roll forming of leg tip
radii with natural edges and also with round edges using the
modified rolling apparatuses according to the invention. Angle
profiles with equal and unequal legs with the same or different leg
thicknesses and with leg tips having natural edges or defined round
edges can be rolled by the inventive modification of the rolling
apparatus with open or closed gap where, however, the essential
standard stand arrangements of reversing, semicontinuous, or
continuous rolling mills are used. Profiles having natural edges
are to be understood as shapes that are the result of a free
lateral expansion during forming without specifically influencing
the shape geometry.
[0012] Preferably, the initial passes necessary for the angle size
for grooving with open or closed gaps are rolled in the usual known
manner from initial pass sections that have a size dimensioned for
the roughing passes. These cross-sectional shapes designated as
leader pass are preferably geometrically adapted in terms of their
shape to the subsequent shapes; however, also preferred are methods
in which the shapes are geometrically adapted to the cross
sectional shape predetermined by the leader passes. Finally, this
means that the open or closed gaps according to the invention can
also be adapted to already existing leader pass geometries or,
where applicable, can be used without any further
modifications.
[0013] The vertical rolls commonly used in universal rolling stands
of the prior art that are arranged in opposing pairs in the center
axis of the horizontal roll and for which therefore the rolling
plane defined by the work rolls is congruent with the rolling plane
defined by the edging rolls, are replaced according to the
invention by preferably vertically arranged edging rolls that are
upstream and/or downstream of the so-called H-rolls and can
preferably be fed up to the barrel region of the profile or
H-rolls.
[0014] In a preferred embodiment of the invention, the edging rolls
are arranged in pairs downstream of the profile rolls so that
viewed in the travel direction of the rolling stock, the rolling
plane defined by the at least one pair of edging rolls lies
downstream of the rolling plane of the profile rolls. In an
alternative and likewise preferred embodiment of the invention, the
edging rolls are provided in pairs upstream of the profile rolls so
that viewed in the travel direction of the rolling stock, the
rolling plane defined by the at least one pair of edging rolls lies
upstream of the rolling plane of the profile rolls. However,
particularly preferred is a configuration in which the at least one
pair of edging rolls is upstream of the profile rolls and at least
one pair of edging rolls is downstream of the profile rolls, as a
result of which in particular the reversing operation of the
rolling apparatus according to the invention is facilitated in an
advantageous manner.
[0015] However, the rolling apparatus according to the invention
can also be used in continuous rolling operation without any
restrictions with regard to the apparatus technology. For example,
if a rolling apparatus comprising edging rolls arranged upstream
and downstream of the profile rolls is used in continuous
operation, then, if necessary, the pair of edging rolls upstream of
the profile rolls can be permanently removed from the edge region
of the angle and thus cannot influence the rolling result. Of
course, the same applies analogously for the pair of edging rolls
downstream of the profile rolls in the rolling direction.
[0016] It is preferred that the rolling apparatus according to the
invention is mounted on a common stand base and therefore is also
used as a quasimodified universal rolling stand within a rolling
train. With this preferred embodiment, it is also possible to do a
retrofit or replacement with the stand, or to completely replace
sets of rolls.
[0017] A particular advantage of the arrangement of the edging
rolls upstream and/or downstream of the roll plane of the profile
rolls is that, if needed, the edging rolls can be set at a spacing
from each other that is smaller than the barrel width of the
profile rolls. In conventional universal roll stands, positioning
the edger relative to one another was always limited by the
dimensions of the work rolls, where there was no possibility to use
the edging rolls for profile widths that were narrower than the
barrel width of the work rolls. This problem is solved according to
the invention with particularly simple means in that the usability
of the rolling apparatus according to the invention is increased
without the need of installing profile rolls having a narrower
barrel width for narrower profiles. Thus, the rolled width can be
smaller than the horizontal barrel width, as a result of which the
major disadvantage of the universal gap rolling known from the
prior art using a typical H-and V-rolling apparatus and a roll gap
between the V-rolls and the front faces of the H-rolls is
avoided.
[0018] At the same time it is now possible with the same set of
rolls to roll angles having different leg lengths, this being
particularly advantageously facilitated if the edging rolls can be
moved relative to the rolling stock individually and also within
the respective pairs of edging rolls.
[0019] The H-rolls of the stands have similarly shaped open drawing
passes for reducing the thickness to the desired thickness of the
finished angle. It is typical here that in all stands the barrel
widths are selected large enough that even the largest leg lengths,
which are design-specifically allocated to a dimension group, can
be formed in the barrel region of the H-rolls.
[0020] In the meaning of the invention, the edging rolls do not
have to be vertical and perpendicular to the profile rolls. Rather,
also such embodiments are considered to be comprised by the
inventive idea in which the edging rolls have only an inclined
position of their longitudinal axes relative to the longitudinal
axis of the upper or the lower profile roll, which principally
results in a V-shape of the position of the pair or pairs of edging
rolls relative to each other. The advantage of an inclined position
of the longitudinal axes of the edging rolls is a smaller reverse
bend in the finishing pass. This is in particular of advantage in
the case of angles having a significant leg length.
[0021] Due to the ability of the inventive rolling apparatus to set
the edging rolls in an inclined position with regard to the rolling
stock, the possibility of making a great variety of profiles
without the need of replacing complete apparatus portions is
supported. Preferably, influencing the medium straight profile
width and thus the leg lengths takes place by the vertical edging
rolls that, however, are oriented at an angle. The width-dependent
dimension groups are mainly determined by the possible vertical
positioning range of the rolling apparatus, preferably in a
modified universal rolling stand, because the edging rolls are not
impaired by the H-barrel width.
[0022] The shape of the edging rolls of a rolling apparatus
according to the invention is not necessarily strictly cylindrical
with a round cross section, but can deviate from this shape at
least over partial lengths of the edging rolls. In the meaning
according to the invention, the vertical edging rolls, depending on
the horizontal gap shape of the profile rolls used, are cylindrical
or frustoconical if the leg ends of the angle profile to be made
are desired with natural edges or undefined edge radii. However,
for implementing defined leg ends having predetermined end radii,
the vertically arranged edging rolls can also be stepped and can
comprise a defined transition radius in the corner of the shoulder.
However, the stepped edging rolls having a transition radius can
preferably be used for horizontal gap shapes of the profile rolls
having a horizontal and parallel position of the leg-angle profile
relative to the longitudinal axis of the respective profile
rolls.
[0023] The use of stepped vertically arranged edging rolls having a
defined transition radius between the legs of the angle profile may
require, if needed, a new previously uncommon operating mode of the
profile rolls and the edging rolls. Depending on the selected shape
of the profile rolls and the edging rolls, preferably, different
methods and operating modes for positioning can be selected: [0024]
a) Use of a smooth edging roll having a cylindrical shape, and of a
work roll gap in horizontal, parallel position of the legs of the
angle profile relative to the axis if the profile rolls: [0025] The
horizontal and vertical positioning mechanisms are used analogously
to the usual universal rolling. The directions of action of the
horizontal and vertical positioners are then perpendicular to the
leg thickness of the angle profile to be made and to the straight
material width thereof so that the positioning mechanisms become
directly active in a ratio of 1:1 corresponding to the changes of
the positioning travel. The rolling line remains centered
corresponding to the initial alignment and does not change because
of potential changes in positioning. [0026] b) Use of a smooth
edging roll having a frustoconical shape, and of a work roll gap in
horizontally inclined position of the legs relative to the axis of
the H-rolls: [0027] Here, the horizontal-vertical positioning
mechanisms act through a certain factor on the leg thickness and
the straight material width of the angle profile to be made. In
this case, the direction of action of the positioning travel is not
perpendicular to the profile variables to be influenced, namely the
leg thickness and the straight material width. A preferably fully
automatic positioning and roll gap control system that is used here
preferably considers this influence and simplifies handling of the
entire control system. In this embodiment too, the rolling line
remains centered according to the initial alignment and does not
change because of potential changes in positioning. [0028] c) Use
of a stepped profiled vertical edging roll having a cylindrical
shape, and of a horizontal work roll gap in horizontal parallel
position of the legs relative to the axis of the H-rolls: [0029]
Here, the changes in horizontal and vertical positioning have a
direct effect in a ratio of 1:1 on the leg thickness and the
straight material width because the directions of action of
positioning are perpendicular to the leg thickness of the angle
profile of the straight material width thereof. Through the stepped
profiled vertical edging rolls, the lower profile shape of the
lower work roll in this embodiment is precisely defined in terms of
its position. This requires, if necessary, that only the upper
horizontal roll is positioned for reducing the leg thickness. A
preferably fully automatic positioning and roll-gap control system
that is used here considers this, if necessary, and blocks in such
a case the lower horizontal positioning movement of the work rolls.
The rolling line center shifts systematically toward the horizontal
lower profile roll, corresponding to the changes in positioning of
the upper horizontal roll. [0030] d) Use of a stepped profiled
vertical edging roll having a conical shape, and of a horizontal
work roll gap in horizontal, inclined position of the legs of the
angle profile to be rolled relative to the axis of the H-rolls:
[0031] Here, the horizontal and vertical positioning mechanisms act
through a certain factor on the leg thickness and the straight
material width of the angle profile to be made. In this case, the
direction of action of the positioning travel is not perpendicular
to the profile variables to be influenced, namely the leg thickness
and the straight material width. Through the stepped profiled
vertical edging rolls, the lower profile contour of the lower
horizontal profile roll, in terms of its position, is allocated to
the vertical edging rolls in a defined manner. Vertical changes in
positioning the edging rolls have an influence on this allocation
and are preferably compensated through position corrections of the
lower horizontal profile roll. Reducing the leg thickness of the
angle profile is preferably exclusively implemented by positioning
the upper horizontal profile roll. A preferably fully automatic
positioning and roll gap-control system that is used here considers
all these influences and effects a particularly simple handling of
the method. Here, the rolling line center shifts systematically
toward the horizontal lower profile roll, corresponding to the
changes in positioning of the upper horizontal roll, wherein due to
vertical dimension changes, position corrections of the work roll
may possibly have a counteractive or supportive influence.
[0032] In general, it is to be noted that existing rolling trains
comprising universal stands are characterized in terms of their
structure by an alternation of universal stands and edging stands.
By sufficiently dimensioning the edging stands with regard to their
maximum rolling force and the maximum rolling moment, the edging
stands can be integrated in the rolling process for leg thickness
reduction of the angle profile. Here, due to the machine-related
design with regard to the maximum rolling force and the maximum
rolling torque, the universal stands do the main forming work when
making the angle profile from the preliminary profile. Also, in the
universal stands, in addition to the reduction of the leg
thickness, the medium straight profile width is specifically
adapted to the different angle dimensions.
[0033] Since each rolling apparatus according to the invention has
edging rolls arranged in pairs upstream and/or downstream of the
horizontal profile rolls, the use of the rolling apparatus
according to the invention results in a very effective influence on
the straight profile width of the angle profile, notwithstanding
that in the case of small edging rolls, the maximum vertical
rolling force for the usual vertical rolling with a large roll
diameter and a significant barrel width can be significantly
underrun.
[0034] Since the universal mill trains from the prior art usually
have twice the number of universal stands compared to edging
stands, according to the invention, the required width reduction is
distributed over twice the number of passes compared to the
conventional known universal angle rolling method. By arranging the
edging rolls upstream and/or downstream of the horizontal profile
rolls, there is in addition the possibility of immediately
neutralizing again the lateral expansions caused by the leg
thickness reduction pass. Thus, the possible number of vertical
passes doubles again when using the rolling apparatus according to
the invention. This has forming-related advantages, in particular
when making thin leg thicknesses for which the width reductions can
be kept small in a targeted manner.
[0035] The additional possibilities of configuring the edging rolls
in a continuous arrangement, for example, with changing diameters
or an offset arrangement upstream and/or downstream of the stand(s)
carrying the horizontal profile rolls, likewise expand the
flexibility when making many different angle profiles.
[0036] In a particularly preferred configuration of the invention,
the rolling apparatus according to the invention is part of a
rolling train that comprises at least one rolling stand having a
rolling apparatus according to the invention and at least one
finishing gap. Alternatively, the rolling apparatus according to
the invention can also be part of a compact group or a tandem group
that comprises at least one rolling apparatus according to the
invention and one finishing gap as well as a pair of edging rolls
arranged between the rolling apparatus and the finishing gap.
Particularly preferred is in the second alternative if the compact
finishing group comprises two rolling apparatuses according to the
invention and one pair of edging rolls arranged between these two
rolling apparatuses. Through this, applicability of the rolling
apparatus according to the invention to already existing apparatus
concepts while fully achieving the above-described goals is
facilitated in a particularly advantageous manner.
[0037] In reversing mill trains that usually comprise a three-stand
compact group including two universal stands and one edging stand
are usually identical. In such a case, the second universal stand
has to be used as a duo stand in order to accommodate the finishing
gap. However, in the meaning of the invention this can be avoided
if the edging stand (with horizontal edging rolls, so-called
"edger") is displaceable, if a sufficient barrel length is
available, and if the edging stand is sufficiently dimensioned in
terms of machine stability. In this case, the finishing gap can be
arranged on the edging stand (edger), and the second rolling stand
having the rolling apparatus according to the invention can also be
used for effective rough rolling. Moreover, this additional
arrangement of the finishing gap on the barrel of the edging stand
enables that a two-stand rolling stand group comprising a rolling
apparatus according to the invention and an edging stand (edger)
can also be used for this type of angle rolling.
[0038] This is also the case if, in addition to the compact group,
a separate finishing stand is available. Since in the case of large
angles, setting the folding process of the legs of the angle
profile into the 90.degree. position in the finishing stand is
extremely difficult, the drawing pass in the first and second
rolling stands of the compact group can also be selected with
different acute angle geometries. The constant folding process can
then be carried out preferably completely or partially in the
edging stand. By preferably using a displaceable edging unit
comprising horizontal edging rolls (edger) having a sufficient
barrel length, preparatory folding into the 90.degree. position can
also be prepared in a second gap on the edging stand itself. In the
last cycle, preferably, the rolled profile runs idle through the
second rolling stand having the rolling apparatus according to the
invention, and the folding process is prepared in the roughing gap
on the edger and is completed on a separate finishing stand. The
advantages of this special solution are, in particular, little gap
wear in the finishing gap and a more flat configuration of the
rolling stands that are modified according to the invention and
have open and closed gaps, thereby enabling overall a better roll
utilization.
[0039] With regard to the method, the invention is implemented in
that for making angle profiles, a rolling apparatus is used that
comprises an upper horizontal profile roll and a lower horizontal
profile roll that together define an open or closed roll gap that
lies in a rolling plane perpendicular to the travel direction of
the rolling stock, and at least one pair of nonhorizontal edging
rolls that laterally compress the rolling stock and define a
rolling plane that is perpendicular to the travel direction of the
rolling stock, wherein the rolling plane defined by the at least
one pair of profile rolls and the rolling plane defined by a pair
of edging rolls are not congruent with each other. According to the
invention, prior to and/or after the rolling pass by means of the
horizontal profile rolls, the rolling stock is formed by at least
one pair of nonhorizontal edging rolls.
BRIEF DESCRIPTION OF THE DRAWING
[0040] The above and other objects, features, and advantages will
become more readily apparent from the following description,
reference being made to the accompanying drawing in which:
[0041] FIG. 1 is a side view of a universal rolling stand according
to the invention; and
[0042] FIGS. 2A and 2B show different gap geometries of edging
rolls in the universal rolling stand according to the
invention.
DETAILED DESCRIPTION
[0043] As seen in FIG. 1 a rolling apparatus 1 according to the
invention has an upper horizontal profile roll 2 and a lower
horizontal profile roll 3 that rotate about respective parallel
horizontal axes 2A and 3A and that define a horizontal roll gap or
pass and a rolling plane that is perpendicular to a travel
direction D (indicated by the arrow) of the rolling stock 6 and
that includes the axes 2A and 3A. The rolling apparatus 1
illustrated here, arranged in a common stand, is used as a
reversing rolling stand through which the rolling stock 6 in the
drawing passes from left to right and also from right to left
through the rolling plane defined by the upper profile roll 2 and
the lower profile roll 3.
[0044] On the left in FIG. 1, offset from the rolling plane defined
by the profile rolls 2 and 3, there is a pair of left edging rolls
4a and 4b of which only the front edging roll 4a is shown in the
figure. Analogously and equidistant from the rolling plane of the
upper profile roll 2 and the lower profile roll 3, is a right pair
of edging rolls 5a and 5b whose rolling plane is also perpendicular
to the travel direction of the rolling stock 6 and is not coplanar
with the rolling plane defined by the upper and lower profile rolls
2 and 3. Due to the small length dimensions of the edging rolls 4a,
4b, 5a, and 5b and the dimension of the offset of the respective
rolling planes of the pairs of edging rolls 4a, 4b and 5a, 5b to
the rolling plane defined by the upper and lower profile rolls 2
and 3, shifting the pairs of edging rolls 4a, 4b and 5a, 5b toward
each other can be done with a spacing smaller than the width of the
roll barrel of the upper and lower profile rolls 2 and 3. As a
result, a rolling apparatus 1 according to the invention having
open gaps is provided.
[0045] FIG. 2A shows the edging rolls 4a, 4b and 5a, 5b, the pair
of edging rolls 4a and 4b having a smooth cylindrical shape with
their rotation axes extending vertically relative to the angle
profile 6. The spacing of the edging rolls 4a, 4b forms angle legs
9 and 10 that are parallel to and aligned with each other and
connected to each other at an apex 8 on the upper side of the angle
profile 6 and an angle radius 11 on the lower side of the angle
profile 6.
[0046] FIG. 2B shows the profiled edging rolls 5a and 5b that, like
the edging rolls 4a and 4b in the left view, have vertical rotation
axes. However, due to the shape of the edging rolls 5a and 5b, the
legs 9 and 10 of the angle profile 6 that are generated are not
parallel to or coplanar with each other. However, as in the
embodiment of FIG. 2A, they are likewise connected to each other at
a sharp apex 8 on the upper side of the angle profile 6 and a
downwardly arcuately concave angle radius 11 on the lower side of
the angle profile 6. In addition, the shape of the edging rolls 5a
and 5b forms a leg tip radius 7 on the lower sides of the legs 9
and 10 of the angle profile 6.
* * * * *