MXPA97005422A - Method of lamination and laminator of a strip parareducir the fall of bo - Google Patents
Method of lamination and laminator of a strip parareducir the fall of boInfo
- Publication number
- MXPA97005422A MXPA97005422A MXPA/A/1997/005422A MX9705422A MXPA97005422A MX PA97005422 A MXPA97005422 A MX PA97005422A MX 9705422 A MX9705422 A MX 9705422A MX PA97005422 A MXPA97005422 A MX PA97005422A
- Authority
- MX
- Mexico
- Prior art keywords
- amount
- displacement
- strip
- edge
- edge drop
- Prior art date
Links
- 238000003475 lamination Methods 0.000 title claims description 72
- 238000006073 displacement reaction Methods 0.000 claims abstract description 262
- 238000005096 rolling process Methods 0.000 claims abstract description 96
- 238000009826 distribution Methods 0.000 claims description 81
- 238000000926 separation method Methods 0.000 claims description 56
- 230000001276 controlling effect Effects 0.000 claims description 10
- 238000010030 laminating Methods 0.000 claims description 8
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims 2
- 238000011002 quantification Methods 0.000 claims 1
- 239000000463 material Substances 0.000 description 61
- 229910000831 Steel Inorganic materials 0.000 description 25
- 239000010959 steel Substances 0.000 description 25
- 238000005097 cold rolling Methods 0.000 description 22
- 230000000694 effects Effects 0.000 description 18
- 238000000034 method Methods 0.000 description 12
- 239000000047 product Substances 0.000 description 12
- 238000005098 hot rolling Methods 0.000 description 11
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- 239000000498 cooling water Substances 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000002596 correlated Effects 0.000 description 1
- 230000003247 decreasing Effects 0.000 description 1
- 230000003292 diminished Effects 0.000 description 1
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- 238000005755 formation reaction Methods 0.000 description 1
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- 229910052742 iron Inorganic materials 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The present invention relates to a method of rolling a strip to reduce an edge drop, effected by a pair of work rolls, each having a tapered end for displacement in an axial direction, the pair of upper work rolls and a lower work roll that are curled together, the method comprises the steps of: (a) determining an amount of displacement and crossing angle as operating quantities necessary to correct the edge fall of the strip, and (b) causing that the work ridiculous are displaced by the amount of displacement determined and cause the work rolls to cross each other in the intersection angle determined
Description
--ü * METHOD OF LAMINATION AND LAMINATOR TE A STRIP TO REDUCE THE FALL OF EDGE
BACKGROUND OF THE INVENTION
1. FIELD OF THE INVENTION
The invention relates to a method of rolling a strip and a sheet material rolling mill, the. , Which allows, by the lamination of a strip particularly by cold rolling of a similar steel sheet, improvement of the edge drop and the achievement of a uniform thickness distribution in the widthwise direction over the full width. 15 2. DESCRIPTION OF THE RELATED TECHNIQUE
Among the deviations of thicknesses in the width direction produced in a strip (material that goes
has to be rolled) during lamination, a reduction of the acute thickness at both ends in the widthwise direction is known as an edge drop. To obtain a satisfactory laminate with a uniform thickness distribution (thickness profile) in the widthwise direction
lamination is necessary to reduce the edge drop.
It is a conventional control practice to reduce the edge drop to make the work cylinders (hereinafter sometimes abbreviated as
"WR") that have a tapered end on one side for
move in the axial direction. Japanese Patent Publication No. 2-34241 discloses a method comprising the steps of calculating a thickness profile on the output side of a laminator of the thickness distribution in the widthwise direction of the strip
initial on the input side of the laminator, the separation distribution between the upper and lower working cylinders, and the printing ratio of the separation between the cylinders on the rolled product, comparing this calculated heat with a profile of objective thickness and
causing the work cylinders to move to a position, where the difference between the two values is minimal. Japanese Patent Publication 2-4,364 describes a technique for resolving the edge drop comprising the
stages of using a pair of working cylinders, at least each of which has a tapered end converging on one side, locating the tapered portions at the ends on both sides during lamination and improving the geometry of the gap between the
cylinders at the ends on both sides. This patent publication also describes a case of application of this technique to a cold rolling, in series, where at least a first group is provided with the working cylinders having the tapered portion. Japanese Patent Publication, Without Examination
No. 60-12213 describes a method of performing a displacement control of the working cylinders to adjust the displacement position of the work rolls, which comprise the steps of comparing and calculating an observed value and a target value of the amount of edge drop, by means of an edge drop meter installed on the output side of an end frame and which controls the displacement of the work rolls based on the results of the comparison and calculation. Japanese Patent Publication No. 6-71,611 discloses a method of adjusting the amount of displacement of the work rolls based on a difference between an edge drop of an initial strip material for rolling prior to rolling as measured with an edge drop gauge installed on the input side of a laminator and an objective value thereof, and a difference between an edge drop of a product, after laminating as measured with an edge drop gauge installed on the output side of the laminator and an objective value thereof.
? Japanese Patent Publication No. 2-34,241 describes a method proposed by the present applicant to incorporate a thickness distribution in the widthwise direction of a strip material to be laminated on the inlet side of a strip. laminator as a control factor. This method includes calculating a thickness distribution on the exit side of the laminator (final frame) or in a product, by means of a thickness distribution in the widthwise direction of the strip material to be laminated
before lamination, a distribution of the cylinder gap between the upper and lower working cylinders and a printing ratio of this separation distribution between the cylinders on the rolled product and adjust a displaced placement of the working cylinders to achieve
a minimum difference between this calculated value and a target thickness distribution. The references "Sheet Crown Edge Drop Control Characteristics" (the 45th Plástic Working Federation Lecture Meeting Preprint, pp 403-406, 1994) and "Edge Profile Control
Using Pair Cross Mill in Cold Rolling "(Iron and Steel engineer, pp. 20-26, June 1996) describe findings that by causing upper and lower work cylinders to cross each other, along with backup cylinders on the respective sides, there is available a
effect of achieving a uniform thickness profile (the -
. thickness distribution in the widthwise direction) under the action of a separation between the cylinders, parabolic produced from the center of the width towards the end of the strip between the upper and lower working cylinders. As a combination technique a crossover cylinder and a displacement cylinder for the upper and lower working cylinders, for example Unexamined Japanese Patent Publication No. 57-200,503 discloses a technique comprising the steps, in a transverse cylinder 10 rolling mill, comprising groups of upper cylinders and lower cylinders that cross at a prescribed angle in such a way that uniform wear of the working cylinders is achieved, reducing the polishing frequency of the cylinder and thus improving the consumption of the cylinders by displacement of the relative position of the working cylinders from between the groups of cylinders in relation to the strip material to be rolled in an axial direction of the cylinders. Japanese Unexamined Patent Publication No. 5,185,125, discloses a method of operating the displacement cylinder and the work cylinder by a bending force in response to the synchronization of the change of the cylinder crossing angle with a view to reduce the rejection range of the flattened strip produced in the course of 25 changing the angle of crossing of the cylinder, while the? f- adjustment values of the change of the operating conditions during the sliding along with the conduit a roll welding point (strip joint). In the methods described in the Publication of
Unexamined Japanese Patent No. 2-4,364, and Japanese Patent Publication No. 2-34,241, the taper is imparted to the work rolls by polishing prior to rolling. t It is therefore impossible to change the amount of taper or shape during rolling. Work cylinders
are usually not replaced for each roll, but are in service for the rolling of several tens of rolls. By the continuous rolling of several tens of rolls, increasing the amount of taper imparted to the work rolls, it is effective for a roll that has
a larger edge fall in the strip of material. For a roll that has a small edge drop the strip of
The material, however, an increased taper is not effective and excessive thicknesses are produced near the inside of the ends of the strip in the direction
wide. A diminished tapering is, in contrast, effective for a roll that has a small edge drop on the strip of material, while a tapering taper sometimes can not ensure enough improvement for a roll that has a large edge drop on the strip from
material. These methods have, therefore, a problem in 1 ^ - that the uniform thickness profile is not achieved for the whole width through the improvement of the edge fall for all the rolls. Japanese Patent Publication Without Examination
No. 2-34,241 does not take into account the behavior that occurs due to the edge fall in the frames in the downstream of a roll (control frame) that has a displacement mechanism of the cylinder capable of changing the distribution of thickness in the widthwise direction, in this way leading to a decrease in the accuracy of the calculation of the thickness deviation in the widthwise direction on the output side of the final frame. When the lamination is carried out to a displaced position of the working rolls adjusted by this method, there is a problem in which
the thickness distribution in the widthwise direction on the exit side of the final frame does not coincide with a target thickness distribution. To take the behavior that occurs by falling edge on individual racks into account, it is not
It is necessary to measure the thickness deviation in the widthwise direction on the exit side of each frame. In a series cold rolling, however, the distance between the frames is small and in addition splash of cooling water or lubricating oil occurs. Therefore it is
It is difficult to install a detector to measure a distribution of thickness in the width direction, which causes another difficulty of a high-cost installation. In a series mill, therefore, it is practically impossible to measure the thickness distribution in the width direction between the 5 frames during rolling. In the method described in the previous reference,
"Sheet Crown Edge Drop Control Characteristics", the
-_ - _- separation between the cylinders expands slightly in a parabolic shape from the center of the width towards the end
of the strip. Although this leads to approximately an effect of improving the so-called crown of the body (leaf crown) the effect can not be expected in the reduction of a fall of the edge, which is a deviation of the thickness at the end of the width. In Japanese Patent Publication No. 57- 206,503, mentioned in the foregoing, which has the purpose of preventing local wear of working cylinders, it is impossible to control an edge drop. The technique described in the Patent Publication
Japanese unexamined No. 5-185,125 mentioned above, aims to avoid deterioration of the shape of a strip during the transition period to change the transverse angle. One problem here is that an improvement in the effect of falling edge over that of the
The technique described in Japanese Unexamined Patent Publication No. 2-4,364 mentioned above can not be expected from this technique.
BRIEF DESCRIPTION OF THE INVENTION
The invention was developed to solve the conventional problems mentioned in the above.
Particularly in a rolling process, the invention aims to provide lamination of a strip and a method of lamination of a strip, which, when the strips of cold rolling material are going to be laminated having various thickness profiles after of a hot rolling process, ensures the reduction of an edge drop, which is an acute decrease in the thickness that occurs at the ends in the widthwise direction of the strip and allows rolling at a uniform thickness throughout the full width. Another object of the invention is to obtain a satisfactory thickness distribution over the whole width in the range of a slow thickness deviation (corona) that occurs from the center of the width towards the end side of the strip, to a thickness deviation acute (edge drop) that occurs at the wide end. Furthermore, another object of the invention is to efficiently control the thickness distribution in the T-direction widthwise on the exit side of a lamination
- in series even when a control frame has an operating means for changing the thickness distribution in the widthwise direction of a strip in a series lamination 5 is upwards of the final frame and the strip is further laminated after the frame of control. The invention provides a method of lamination
^ To make the work cylinders each have a
^^ tapered end to move in the axial direction and that
has the upper and lower working cylinders transverse to each other, which comprises the steps of determining an amount of displacement and a crossing angle as quantified from the operation necessary to correct an edge drop of the strip; make the
working cylinders are displaced by the amount of displacement determined in this way and which has the
^ Working cylinders crossed with each other at the crossing angle thus determined. In addition, the present invention provides a method of laminating a strip in a series mill, incorporating the above rolling method in at least one rack, in a method for continuously rolling the strip in the series mill comprising a plurality of frames.
The present invention further provides a method of continuously rolling a strip onto a series mill incorporating the first method of lamination mentioned above for two or more frames between the plurality of frames, comprising the steps of performing the control of displacement of the working cylinder and control the crossing of the working cylinder of the front side frames on the basis of a thickness distribution
~ ^ detected before the front side frames
between the two or more racks and carry out the crossing control of the working cylinder of the rear side frame on the basis of a thickness distribution detected after the rear side frame between the two or more frames. The present invention also provides a laminator for the application of the above methods. More specifically, the present invention provides a laminator of a strip, in which at least one of a pair of work rolls has an end
tapered, provided with a sliding mechanism, which causes the tapered roller to move in the axial direction and a crossover mechanism, which causes the rollers to rotate through a certain angle within the plane parallel to the rolling plane to achieve the mutual crossing, which
comprises a control means which determines an amount of P-displacement and a crossing angle as operating quantities necessary to correct the edge fall of the strip; and sending the determined amount of displacement and crossing angle to the displacement mechanism and to the crossover mechanism 5 to cause the working cylinders to move for the amount of displacement and to cross each other by the crossing angle. The other contents of the present invention will be clarified by the specification and the claims.
In accordance with the present invention as described above, it is possible to improve the thickness distribution in the widthwise direction of a strip, particularly to reduce an edge drop, which is an acute decrease in thicknesses that is present in
the wide ends, and in this way to laminate the strip in a uniform thickness across the width. It is also possible to control appropriately shared by a plurality of frames and to obtain a satisfactory thickness distribution over the whole width,
in the range of a slow thickness deviation (corona) that occurs from the center of the width towards the ends of the strip to a sharp thickness deviation (edge drop) that occurs at the wide ends. It is also possible to effectively control the
thickness distribution in the width direction on the side? - output of a laminator in series even when a control frame having operating means for changing the thickness distribution in the widthwise direction of the strip is located upwards of the final frame and the
rolling is continuous in the subsequent frames.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a descriptive view illustrating a schematic configuration of the rolling accessories applied to the embodiments 1 and 2 of the present invention; Figure 2 is a plan view illustrating a crossing angle of the work rolls; Figure 3 is a conceptual front view illustrating working cylinders; Figure 4 is a descriptive view illustrating the? relationship between the displaced position of the working cylinders and the strip; Figure 5 is a graph for the conceptual illustration of a space between the cylinders, effective of the invention (with the center of the cylinder as a reference); Figure 6 is a graph for the conceptual illustration of a gap between the cylinders, effective of the invention (with the position of 100 mm from the end of the strip as reference);
? - Figure 7 is a graph illustrating the relationship between the gap between the cylinders, effective and the amount of correction of the edge drop; Figure 8 is a graph for the conceptual illustration 5 of changes in the separation of the cylinders caused by a displacement; Figure 9 is a graph illustrating the relationship
_ of printing, when the lamination is carried out causing T that the working cylinders move and cross each other;
Figure 10 is a descriptive view illustrating conceptually a method of control based on the relationship between the effective roll spacing and the amount of edge drop correction; Figure 11 is a graph illustrating typical changes in the thickness profile at one end of the strip at a displacement of the usual working cylinder; Figure 12 is a graph illustrating typical changes in the thickness profile at one end of the strip at the crossing of the usual working cylinder; Figure 13 is a graph illustrating a typical thickness distribution of a strip after cold rolling with the usual flat cylinders; • Figure 14 is a sectional view in the widthwise direction illustrating the positions of a first Wr checkpoint and a second checkpoint in the invention; Figure 15 is a graph illustrating the relationship between the effective roll spacing and the amount of correction of the edge drop in a mode 1 of the invention; Figure 16 is a graph illustrating the improvement --- in the effect of the edge fall in mode 1 of the
~ invention; Figure 17 is a schematic side view illustrating the laminator (frame) used in embodiments 1 and 2 of the invention; Figure 18 is a schematic plan view illustrating the laminator (frame) (displacement unit, crossing unit and working cylinders) in the embodiments of the invention; ^ - ^ Figure 19 is a graph illustrating the effect of improving the edge drop in the mode 2 of the invention; Figure 20 is a block diagram illustrating the configuration of a 3-1 embodiment of the invention as applied to a series rolling mill for cold rolling of six racks; Figure 21 is similarly a block diagram 25 illustrating the configuration of a 3-2 mode;
^ - Figure 22 is similarly a block diagram illustrating the configuration of a 3-3 mode; Figure 23 is a graph comparing the average rejection velocity values in the widthwise direction between a conventional case and the mode 3-1 of the invention; Figure 24 is a descriptive view illustrating
# a schematic configuration of the lamination accessories used in a mode 4 of the invention; Figure 25 is a graph illustrating the relationship between the amount of change in the edge drop on the exit side of the final frame and the crossing angle; Figure 26 is a graph illustrating the relationship between the crossing angle and the influence index, as applied in a mode 4 of the invention; Figure 27 is a graph illustrating the effect | for improving the edge fall in the mode 4 of the invention; Figure 28 is a sectional view illustrating the definition of the edge drop in a strip of material in a mode 5 of the invention; Figure 29 is a sectional view illustrating the definition of the edge drop on the outlet side of a control frame;
Figure 30 is a sectional view illustrating the definition of the edge drop on the exit side of a final frame; Figure 31 is a flow chart illustrating the processing steps in mode 5 of the invention; Figure 32 is a block diagram illustrating the configuration of mode 5 of the invention as applied to a 6-frame series mill having a first frame serving as the control frame; Figure 33 is a side view illustrating the shape of the work rolls used in a control frame; Figure 34 is a graph comparing the effects 15 between the mode 5 of the invention and the conventional method; Figure 35 is a block diagram illustrating the configuration of a mode 6 of the invention as applied to a series mill of 6 racks; and Figure 36 is a graph comparing the average values of the edge drop that lose the relation between the conventional case and the mode 6 of the invention;
DESCRIPTION OF THE PREFERRED MODALITY
First, the displacement and crossing of work cylinders having a tapered end on one side (hereinafter referred to as a "WR tapered on one side") used in the present invention, will be conceptually defined in the following with reference to Figures 2 to 4. Figure 3 conceptually illustrates a rolling mill
as seen from the front. The displacement is an operation of making the work rolls, which have a tapered end on one side at a symmetrical point rolling end of the upper and the lower work rolls, for reciprocating directions
inverses along the axis. The amount of displacement is the amount of this displacement. More specifically, how
'' is shown in Figure 4 illustrating an enlarged view of a tapered end and the proximity thereof, EL is the distance between one end of a strip of materials S that goes
to be rolled and a tapered initial point E. The amount of taper of the cylinder is defined as H / L as shown in Figure 4. Technically, tapering at least one end of at least one cylinder from between the cylinders of Upper and lower work would be sufficient to achieve the objects of the invention. Figure 2 conceptually illustrates the laminate as seen from above. The crossing is an operation of causing the upper and lower working cylinders to rotate in a plane parallel to the rolling plane to achieve a mutual crossing as shown in Figure 2. The crossing angle teta is one half of the angle formed by the axes of both of the working cylinders. From the technical point of view, the object of the invention can be achieved by making at least one of the upper and lower working cylinders rotate in a plane parallel to the rolling plane. In Figure 5, the reference number 501 is a typical cylinder spacing produced by the displacement WR. The reference number 502 represents a typical roll spacing caused by the WR crossing. A typical cylinder separation achieved by the simultaneous use of WR displacement and WR crossover is represented by reference number 503. The term "cylinder spacing" is defined as a separation between the upper and lower WRs. no load with the center of the cylinder as reference. In general, in the lamination of the strip, a separation between the rolls WR serves to improve the thickness profile of the laminated strip. This invention provides improvement of the thickness profile and particularly of the edge drop by combination of WR offset taper on one side and the crossing. In the aforementioned improvement of the thickness profile particularly of the edge drop, it is advantageous to previously determine the ratio of 3 factors: the amount of displacement, the crossing angle and the correction amount of the corresponding edge drop. these
operation quantities and to determine a displacement amount and a crossing angle at the base of this ratio, to obtain a desired amount of correction of the edge drop. In addition, the present invention led to studies
extensive carrying three types of lamination including a lamination that causes the WR to have a tapered end of the cylinder for displacement, lamination to cause the upper and lower WR to cross each other and a lamination using the WR offset simultaneously
and the crossing of WR. As a result, discoveries were made that the portion of a gap between the cylinders corresponding to the end of the strip in a separation of the cylinders (separation between the upper and lower WR that are not under load) produced by "9 displacement and crossing It was particularly effective in improving the edge drop, in the displacement cylinder, the transverse cylinder and the displacement-crossing combination of the
cylinder carried out by providing a reference position of separation between the cylinders effective at a position at a certain distance from the end of the strip, the
? tr? separation between the rollers with this reference position
^ f as reference and the amount of improvement (correction) of the
edge fall can be determined successfully. The possibility of controlling an edge drop in this way was found by controlling the amount of displacement and crossing angle of the WRs. More specifically, a separation between
cylinders is generally defined as shown in
Figure 5, as a gap between the upper WRs
^ T and bottom without load, when the center of the cylinder is used as a reference (a separation between the cylinders in the center of the cylinder would be 0). In the
The present invention, however, uses a concept in which a reference position of the gap between the cylinders is provided effective at a position at a certain distance, 100 mm for example, from the end of the strip, (placed separately). from the end of the strip by 100 mm
towards the center of the width) and the separation between ^ > w cylinders between the upper and lower WR with that position is used as a reference (a gap between the cylinders in that position is set to 0) (hereinafter referred to as the "separation between the cylinders
effective ") Figure 6 illustrates effective roll spacing, defined with the position 100 mm from the end of the strip as a reference Figure 7 illustrates the relationship between spacing
between the effective rolls and the amount of correction of the edge drop, as studied by means of a rolling experiment. In this experiment, two types of cylinders that have tapers of 1/500 and 1/250 were used as the WRs, with a displacement amount of WR within one
range from 0 to 70 mm and WR crossing angle within a range of 0 to 0.8 °. The deviation of the thickness between a position of 15 mm from the end of the strip and a position 100 mm from the end of the strip is defined as the amount of the edge drop. The correction amount of the edge drop is
the difference between the amount of edge drop when rolling with flat cylinders (with a displacement amount of 0 mm and a crossing angle of 0o), on the one hand, and the amount of edge drop when laminated with a prescribed amount of displacement and a crossing angle
prescribed, on the other hand.
Figure 7 suggests that although the correction amount of the edge drop is small when the effective roll spacing is small, the amount of edge drop correction correction suddenly increases according to the effective roll spacing that reaches be bigger By using the concept of the effective separation between the cylinders, therefore, it is possible to correlate the operation amount of the displacement amount and the crossing angle with the correction amount of the corresponding edge drop. Although the 15 mm position of the end of the strip has been used in the above to define the amount of edge drop, the relationship between the effective roll spacing and the edge drop is still valid for a position for example, of 10 mm or 20 mm from the end of the strip. The reference positions of the effective roller spacing can be changed in response to various conditions such as the thickness or deformation resistant of the material strip, the WR diameter and the rolling load and this position is not limited to 100 mm from the end of the strip. Since it is therefore possible to correlate the effective roller spacing and the edge fall correction amount as described above, it is also possible to adjust the amount of * offset and crossover angle, to determine an amount of displacement and a crossing angle at the base of the relationship between the effective gap and the amount of correction of the edge drop. In addition, the present invention led to further extensive studies carrying out lamination causing the upper and lower working cylinders to cross each other by a prescribed amount in a rolling mill, while adjusting the position of displacement in the direction
axially of the working cylinders having a tapered end on one side of the cylinder (WR tapered on one side) (hereinafter referred to as "WR rolling offset tapered on one side"), and as a result, was found through this experiment that the proportion of
printing varies when the upper and lower working cylinders were made to cross each other for a prescribed amount. The printing ratio is expressed by the following formula (1) of the relation between the amount of change in the space of separation in the cylinder and the
amount of change (amount of correction) in the edge drop: Printing ratio = (amount of correction of the edge drop / amount of change in the separation between the rolls x 100%] (1) * Now, the ratio The description of the printing cylinder will be described in detail in the following: First, the separation between the cylinders is a separation between an upper cylinder and a lower cylinder 5 without load, with that in the center of the width of the working cylinder as the reference value. The amount of change in the separation between the cylinders means an amount of change in the separation between the cylinders, when the amount of displacement of 0 mm changes to an amount
prescribed with a crossing angle kept constant. Figure 8 conceptually illustrates the relationship between the spacing between the rollers and the amount of displacement. The amount of change in the roller separations will be described with reference to Figure 8.
that a gap between the rolls is always 0 when the amount of displacement is 0 and a crossing angle is 0, the amount of change in the gap between the rolls when moving the amount of shift from 0 mm to 50 mm, while it maintains an angle of grows to 0 or
is represented by RGA at a distance of 25 mm from the end of the strip. Similarly, if the amount of displacement with a crossing angle of? L corresponds to a gap between the cylinders of 0 mm as indicated by the dotted line, the amount of change in the
The separation between the cylinders, when moving the w 'amount of displacement from 0 mm to 50 mm represented by RGB at a distance of 25 mm from the end of the strip. The amount of correction of the edge drop
is, the difference between the amount of the edge drop when rolling with cylinders of an offset amount of 0 with a prescribed crossing angle and
^ the amount of edge drop when rolling with cylinders of a prescribed amount of displacement with
the prescribed crossing angle. The amount of the edge drop means a deviation in thickness in the widthwise direction in the end region of the strip. The amount of edge fall to an arbitrary position in the end portion of the strip is defined by
of a deviation between the thickness at a reference position eg to 100 mm from the strip end
^ m 'and the thickness in the arbitrary posi tion. More particularly, the printing ratio of formula (1) is the ratio when a crossing angle is adopted, of the amount of change (amount of correction) in the edge drop of the strip after rolling, with the WR tapered on one side with a prescribed amount of displacement for the amount of change in the spacing between the cylinders, when moving the tapered WRs on one side "? From an offset amount of 0 mm by a prescribed amount." Figure 9 illustrates a case, where the crossing of the upper and lower working cylinders leads to a change in
the printing ratio as expressed by the formula
(1) . In the lamination of a tinplate steel sheet, the crossing angle of the tapered WRs on one side of a
? Taper of 1/300 is changed from 0 to 0.5 ° at intervals of
~ * 0.1 °, and for each crossing angle, the proportions of
printing at the points of individual distances from the end of the strip with an amount of displacement of the working cylinders of 50 mm are illustrated in the
Figure 9. The available print ratio with a displacement amount of 30 mm and a crossing angle of 0.2 ° is represented by a dashed line also in the? F Figure 9. The results shown in Figure 9 follow that, a despite the same amount of taper of the
working cylinders, a larger crossing angle leads to a surprisingly higher print ratio, except for the 50 mm point from the end of the strip. The conceivable reasons for this change in the printing ratio are that the simultaneous use of
The displacement and crossing of tapered WR on one side results in "(a) an abrupt inclination of the tapered portion when compared to the case of only the WR offset tapered on one side, and (b) according to how the Rolling load at the ends of the strip decreases, tension
at the ends of the strip increases unexpectedly, in such a way that the separation between the cylinders fills more completely with the material. _- With a constant crossover angle, the printing ratio has virtually no relation to the amount of
displacement, except for the proximity of the portion, where the distance from the end of the strip is equated with the amount of displacement, even when changing the amount of displacement of the working cylinders. The printing ratio with a crossing angle of 0.2 ° and a
The amount of displacement of 30 mm is added in the form of a dotted line in Figure 9: in this case, the printing ratio is substantially the same as the value of the printing ratio in the case with the amount of displacement of 50 mm 20 For the simultaneous use of displacement and crossing of
WR tapered on one side, as described in the foregoing in detail, the printing ratio becomes variable even with the work rolls of a constant amount of taper and availability of a substantially effect? equal to that available with a variable amount of taper checked in this way. Since the printing ratio and the amount of change in the edge drop (correction amount) can be correlated as described above, it is possible to determine a displacement amount and a crossing angle necessary to correct the drop of edge of a strip based on the ratio of the amount of displacement, the printing ratio and the amount of correction of the
corresponding edge drop for these operating quantities and the ratio between crossing angle and printing ratio, by prior determination of the ratio of the amount of change in the edge drop in relation to the crossing angle and the amount of change in the
gap between the cylinders in adjusting an amount of displacement and a crossing angle. * In the method of lamination of a strip described in the above, by the adjustment of the control point of the edge drop, the simultaneous use of displacement and crossing
allow the control of two points per side in the direction across the width of the strip. It is therefore advantageous to adjust at least two control points per side in the widthwise direction. Now, we will describe in the following a method that
allows obtaining a desired improvement of the edge drop at the edge drop control point by providing at least two points to control the amount of edge drop per side in the widthwise direction. The method comprises the steps of calculating a separation between the cylinders, necessary to obtain a desired amount of edge fall correction at two edge drop control points from the ratio between the effective roll spacing and the amount of edge fall correction, calculating an amount of displacement and a crossing angle to give the effective, desired separation between the cylinders at the edge drop control points and thus adjust the calculated values. The particular steps will now be described in the following with reference to Figure 10. In Figure 10, reference number 1001 represents a thickness profile in rolling with flat cylinders. Two points xl and x2 are adjusted as the control points for the edge drop. The correction amount of the edge drop necessary to improve the thickness profile in rolling with flat cylinders in a target thickness profile (reference number 1002) is DELTAExl for control point xl and DELTAEx2 for control point x2 . Then for the positions xl and x2, the separations between the effective cylinders DELTASxl and DELTASx2 to obtain the desired amount of correction of the edge drop are determined from each relationship between the effective roll spacing and the correction amount of the fall edge. So, an amount of displacement EL and a crossing angle? to obtain this separation between the 'effective cylinders are determined. Because the usual amount of displacement is below 100 mm, a gap between the effective cylinders' f? _- | _QQ (EL) at a position X mm at the end portion of the strip at the WR offset is defined as follow: f? -100 EL = E ~? 'tan (a >; (2) where EL: amount of displacement tan (): amount of taper. The separation between the cylinders effective ^^ - IQ Q
(?) at the position x mm at the end portion of the strip at the junction of WR is defined as follows: g? _100 (?) = 2 { (W / 2-x) 2- (W / 2-100)} -tan 2T / DW ... (3) where,?, crossing angle W: width of the strip. DW: diameter of WR It is therefore possible to determine the amount of displacement EL and the crossing angle? can be calculated from the following formulas: (? SsL '? 9-? SM9' A?) * tan < 8) (Aa 'Xl-Aa' X2. EL '(4) Aa ~ A?
ß-tan-iT Slf, -? gjeí - (xi-.2)} / (A ^ A,) (5)
,: - 2-f (2 / W-? I) »- (2 / W-100? ^ (5) DW
and », 2yí (2 / W-? 2) a- (2 / W" 100) 3] f7s
where, W: width of the strip (mm) DW: diameter of WR (mm) tan (cx): amount of taper (ex. 1/300). Amount of displacement EL is under 100 mm. In the control in practice, the profile of thickness in the rolling with flat cylinders is calculated by previous preparation models or tables based on the conditions of rolling and conditions of the material, such as thickness of the strip, the load of rolling and the amount of edge fall in the material strip. The relationship between the effective cylinder spacing and the amount of edge fall correction must also be prepared in mathematical models or tables, which must be kept in storage. According to the present invention, as described above, when the edge drop on the strip is controlled by the use of a laminator provided with a mechanism for causing the work rolls to have a tapered end on one side for the displacement in the axial direction and a mechanism for causing the work rolls to cross each other, the steps of operation comprises providing a reference position at a given distance from the end of the strip (mentioned roll separation position effective), calculate the amount of cylinder separation required to achieve a desired improvement of the edge drop at the base of the effective cylinder gap ratio between the upper and lower WR and the amount of correction of the edge drop and determine a displacement amount and a crossing angle to give that amount of separation between the cylinders. Therefore it is possible to ensure the reduction of an edge drop, which is an acute decrease in the thickness that occurs at both ends in the widthwise direction of the strip, in relation to various thickness profiles of material strip and to laminate the strip in a uniform thickness across the width.
? When the edge drop control points are adjusted in the previous rolling method, in addition, the control of the thickness profile is possible in a wide range in the width direction using simultaneously the displacement and crossing (in the direction of wide). Adjusting a first control point at a certain distance from the center of width and a second control point at a prescribed distance f from the first control point toward the end of the strip, the crossing angle can be controlled at the base of 10 a deviation of thickness between the thickness in the center of the width and the thickness in the first control point, and the amount of displacement of the cylinders can be controlled based on a deviation of the thickness between the first control point and the second check Point . 15 This method of control will now be described in the following. * First, the relationship between the edge drop and the crown will be described as for a displacement of the general working cylinder and the crossing of the general working cylinder. In the working cylinder the displacement, as shown in Figure 11, produces a separation between the end of the cylinder and the strip s, due to the taper imparted to the working cylinders?. When a laminate is
strip with such work cylinders 8, the thickness profile takes the form of a continuous line C, which results in a local change in thickness at the ends of the strip, in relation to the thickness profile (represented by a continuous line D) produced in the rolling with flat cylinders without taper. At the crossing of the working cylinder, on the other hand, as shown in Figure 12, a parabolic separation that expands from the center towards the end of the cylinder is produced between the upper and lower working cylinders causing the working cylinders 9 substantially flat impart only a cylinder crown to cross each other. When the lamination is made in this crossover state with a large crossing angle, the thickness profile takes the form as shown by a line D and the general changes in thickness occur in a wide range, including the end of a portion relatively wide inside (on the central side of the width) in relation to the thickness profile produced by the flat cylinder indicated by a continuous line B. In the thickness profile comparison that corrects the crossover effect of the working cylinder and the thickness profile that corrects the displacement effect of the working cylinder demonstrates differences in the amount and shape. The edge fall of the steel sheet after cold rolling, is caused by the edge fall in the strip of material produced by the hot rolling, which is the process coming from and the edge fall of the rolling in cold produced by cold rolling. The amount and shape of an edge drop in the strip after cold rolling varies greatly with the thickness profile of the strip of material. In general, a typical thickness distribution of the strip after cold rolling with the flat cylinders of a strip of hot rolled material is like
is shown in Figure 13. Although the thickness decreases slowly within a range from the center of the thickness to approximately the position A, the decrease in thickness is water in a portion of the position A towards the end of the strip. 15 The general material has been described in the above. To achieve a thickness distribution
* satisfactory by removing a thickness deviation in the widthwise direction in a strip having an edge drop coming from both of a rolling edge drop
in hot and cold roll edge drop, it is clear from the present invention that it is effective to use a laminator provided with work rolls having a tapered cylinder end, a working cylinder displacement mechanism and a mechanism from
crossing of the working cylinder.
T 'In the present invention, as shown in
Figure 14, a first control point is established in a position away from the center of the width by a distance prescribed as the position to achieve the effect of improving 5 (correct or control) the thickness deviation by the cylinder crossing. In addition, a second control point is adjusted to a position by separating it from the first previous control point by a prescribed distance towards the end of the strip (edge) as the position to achieve the effect of improving the
thickness deviation (edge drop) due to displacement of the cylinder. The first control point is located in a position, where the thickness profile can be corrected by crossing the cylinder and it is possible to correct a deviation of
thickness to 100 mm from the end of the strip, for example from that in the center of the width generally known as the crown of the body. The second control point is located, on the other hand, in a position closer to the end of the strip than the first control point or in a
position where the thickness profile can be corrected for roller displacement to allow correction of a thickness deviation in a position of 10 to 30 mm from the end of the strip of that to 100 mm from the end of the strip, known in general as edge fall.
r By the simultaneous use of the displacement and crossing, as described above, the thickness profile can be controlled over a wide range (in the widthwise direction). 5 To calculate an amount of edge-fall correction necessary to correct an edge drop, there is available: a method of calculating the previous amount based on a thickness distribution of a strip measured before
is carried out the control of the rolling of the amount of displacement 'and the amount of crossing of the working cylinders (frame of control of displacement and crossing). A method for calculating based on a thickness distribution of a strip measured after the control frame 15 of displacement and crossing; and a method of calculating the basis of a thickness distribution of a strip measured before the displacement and crossing control beater and after the displacement and crossing control frame. When it is desired to ensure control of an edge drop of the front end of the roll and effectively control the edge drop against changes in the thickness profile of the material strip, information on the thickness profile of the material strip is useful. .
Therefore, it is advantageous to measure the thickness distribution of the strip of material so that it is laminated before the displacement and crossing frame, and to calculate an amount of displacement and a crossing angle on the base.
of this measured result. When it is desired to be able to change the edge fall in the rear side frames and to control exactly the amount of edge drop in the final product, it is advantageous to measure the thickness distribution of the strip
material after the displacement and crossing control frame, and calculate an amount of displacement and crossing angle based on the result thereof. In addition, when carrying out measurements in the two mentioned points and performing the calculation based on a
thickness distribution of the strip of material measured before the shift and crossover control frame and a thickness distribution of the strip of material measured after the shift frame and crossover control, it is possible to control the edge drop to an accuracy raised even for
the front end portion of a roll, effectively control the change in the thickness profile in the roll, be able to appropriately with the changes in the edge drop in the rear side frames and control the amount of the edge drop in the product final to greater accuracy.
For laminating a strip in a series laminator having a plurality of frames, in addition at least one frame must serve as a frame for the control of the displacement and the crossing. In cold rolling, in accordance with the findings of the present invention, the greater thickness of the strip of material to be laminated on the inlet side leads to the formation of a larger edge drop. In a cold series lamination, it is therefore effective
improve the edge drop on the first frame, where the thickness on the input side is the largest. In series lamination, therefore, it is effective and therefore advantageous to use the first frame as in the displacement and crossing control frame. 15 Controlling an edge drop with the use of means that simultaneously change the displacement position of the work rolls by changing the crossing angle in the first frame, in effect substantially equal to that forming the amount of variable taper is available and
By improving an edge drop, it is possible to improve the edge drop for any thickness profile of the strip of material and effectively obtain a uniform thickness profile in the widthwise direction.
Modality 1
The following description of one embodiment of the invention, will demonstrate that it is possible, in a method of rolling a strip to have the work rolls have a tapered end of a cylinder for displacement in the axial direction and cause the work rolls The upper and lower intersect by appropriately adjusting an amount of displacement and a crossing angle and to improve an edge drop satisfactorily, by utilizing the ratio of three factors including the amount of displacement and crossing angle to determine quantities of operation necessary for the correction of a falling edge of the strip and the amount of correction of the corresponding edge drop for these operating quantities in the form of the ratio between the gap between the rolls, between the upper and lower working rolls and the amount of correction of the edge drop, providing a separation between the The effective rolls of reference position separated from the end of the strip by a prescribed distance. A steel sheet for tinplate having a width of 900 mm, collected after lamination is laminated by displacement and crossed over a piece of equipment as shown in Figure 1. The control points for the edge drop were provided to 10 mm and 30 mm from the end of the strip (edge of the strip). The target amount of the edge drop was 0 μm for any of these control points. In Figure 15, the relationship between the effective 5-roll separation and the amount of edge-fall correction at the 10, mm, and 30 mm position from the end of the previously determined strip is represented by 1501 and 1502 , respectively. The reference position of the gap between the cylinders is effective at 100 mm from the end of the strip. In this modality, these relationships were formulated in the following mathematical models: DELTA E 10 = 0.004 X DELTA S 102 ... (8) DELTA E 30 = 0.003 x DELTA S 302 ... (9) where, DELTA E 10: Amount of correction of the fall of 15 edge in a position of 10 mm from the end of the strip; DELTA S 10: Clearance between the cylinders effective at a position 10 mm from the end of the strip; DELTA E 30: Amount of correction of the fall of 20 edge in a position of 30 mm from the end of the strip; DELTA S 30: Effective roller separation to a position of 30 mm from the end of the strip. The effect available when lamination of the above steel sheet will be described in the following with reference to Figure 16.
In Figure 16, the reference numeral 1601 represents a thickness profile at the end of the strip when the steel sheet is rolled with the flat WRs without tapering. Reference numeral 1602 indicates a thickness profile at the end of the strip, when the steel sheet is laminated by the use of the WR tapered on one side with a taper of 1/300 and a displacement amount of 40 mm. A position of 30 mm from the end of the strip, the edge drop could be corrected to a target edge drop. In the 10 mm position from the end of the strip, however, the thickness was larger by more than 10 μm and thus impossible to laminate the steel sheet in a uniform thickness across the width. Now, the rolling mill and the rolling method of the invention as applied to a steel sheet similar to the above, will be described. If the amount of edge fall in the lamination with the flat WRs at a position 10 mm from the end of the strip is E10, it is expressed by: E10 = -27 μm of 1601 in Figure 16. The amount of correction of the edge fall DELTA E 10 necessary to correct the edge fall for the target edge drop is, therefore: DELTA E 10 = 0 (-27) - 27 μm The effective gap between the DELTA S 10 rollers needed to obtain this correction amount of the edge drop DELTA E 10 is as follows from the formula expressing the ratio between the effective roll spacing and the amount of edge fall correction in the 10 mm position from the end of the strip shown in the previous formula (8): DELTA S 10 = / (DELTA E 10 / 0.004) = 82 μm For the 30 mm position from the end of the strip also the effective gap between the rolls is expressed as follows by means of Similar stages: DELTA S 30 = 37 μm By incorporation of these values in formulas (4) and (5): EL = 20 mm? = 0.8 ° The amount of displacement EL and the crossing angle Ó were calculated in this way. When carrying out the lamination by adjusting these values of the displacement amount and the crossing angle, the edge drop could be corrected within the target range as shown by the reference number
1603 in Figure 16. According to the present invention, as described above, it is possible to exactly improve an edge drop, which is conventionally impossible and as a result to obtain a uniform thickness profile over the whole width.
Mode 2
The following description of another embodiment of the invention will demonstrate that it is possible in a method of rolling a strip to have the work rolls have a tapered end of the cylinder to move in the
axial direction and make the upper and lower working cylinders cross each other, to properly establish an amount of displacement and a crossing angle and to correct a falling edge satisfactorily, by utilizing the ratio of the three factors that
indicate the amount of displacement and the crossing angle to determine operating quantities necessary to correct an edge drop of the strip and the correction amount of the edge drop corresponding to these operating quantities; determine a quantity of
correction of the edge drop, necessary to correct a quantity of the edge fall of the strip at a target value in the base of previously determined relationships between the crossing angle and the amount of correction amount of the edge drop to the amount of change in the separation
between the cylinders; and determining a displacement amount and a crossing angle necessary to correct the edge drop of the strip on the basis of the displacement amount, the ratio of the correction amount of the edge drop to the amount of change in the separation between the cylinders, the ratio of the correction amount of the edge fall in it and the ratio between the crossing angle and the ratio of the correction amount of the edge drop to the amount of change in the gap between the rolls . Figure 1 is a side view, including a block diagram, illustrating a schematic configuration of the rolling accessories including a laminator of a second embodiment of the present invention. The lamination accessories used in this mode is a cold rolled series mill comprising six frames in total, which has a rolling mill (rolling and offset rolling) provided with a displacement mechanism that displaces the working cylinders that have a a tapered end on one side of the cylinder and a crossing mechanism that causes the upper and lower working cylinders to intersect each other in a first frame. The previous series laminator has a displacement operator 12, which moves the working cylinders 10 in the first frame to a prescribed position, a crossing operator 14, which causes the crossing of the upper and lower working cylinders at a prescribed angle and a first controller frame 20, which commands a control signal for these operators 12 and 14. This controller 20 calculates a displacement amount and a crossing angle, which are operation quantities of the first frame by the input of the information thickness profile of the strip of material before rolling, as measured by a thickness profile detector 16 of the strip of material, installed on the output side of a hot rolling mill (not shown) of the preceding process and a target value after adjusting the cold rolling by a thickness profile objective adjuster 18 and proportion this amount of displacement and crossing angle com or an output for the previous operators 12 and 14, to control the working cylinders for the prescribed amount of displacement and crossover angle. This controller 20 maintains the data with respect to the relationship between the predetermined crossover angle and the printing ratio and determines a displacement amount and a crossover angle to correct an edge drop of the material strip based on the amount of offset, the printing ratio, the ratio of the same with a correction amount of the edge drop corresponding to these operation quantities and the ratio between the crossing angle and the printing ratio. In this embodiment, the first frame is a four-height laminator comprising the working cylinders and the backup cylinders, provided with the movement mechanism and the crossing mechanism. This is schematically represented on an enlarged scale in Figures 17 and 18. In Figure 17, the upper working cylinder 10A and the lower working cylinder 10B have tapered ends on opposite sides, not shown and these upper and lower working cylinders 10A and 10B are supported with a top backup cylinder 20A and a bottom backup cylinder 20B from above and below, respectively. The upper working cylinder 10A and the lower working cylinder 10B intersect each other. In this first rolling stand, there is provided a displacement unit 22 and a crossing unit 24 of which a sketch is illustrated as being for a single work roll 10 in Figure 18. These are operated by the shift operator 12 and the crossing operator 14 shown in Figure 1 to cause the displacement or crossing of the working cylinder 10 (10A, 10B). The drive system of the displacement unit 22 may consist of any of a hydraulic motor and an electric motor. The crossing unit 24 causes the upper and lower working cylinders(10A, 10B) cross each other move a wedge by pushing or pulling on the entry / exit side of the wedge of WR, and
it is possible to cause only the working cylinders to cross each other to cause the crossing together with the backup cylinders. In this embodiment, a steel sheet for tinplate having a width of 900 mm, collected after rolling, is used as the strip of material and laminated with the use of work rolls tapering on one side having a taper of 1/300 and a cylinder diameter of 570 mm. Now, the effect available in the lamination of the steel sheet mentioned in the above on the lamination accessories mentioned in the above will be described with reference to Figure 19. In Figure 19, the reference number 1901 indicates a profile of thickness at the end of the sheet when rolling the steel sheet with flat cylinders if taper. A displacement amount of 45 mm was necessary to correct an edge drop with a target amount of edge drop from 0 to 5 μm at a position of 10.
mm from the end of the blade (at a control point 10 mm F from the end of the blade) by rolling and shifting the WR tapered on one side, conventional (taper: 1/300). The determination of this 45 mm displacement amount will be described later for purposes of convenience. The thickness profile obtained when carrying out a rolling lamination of WR tapered in a
# side with a real displacement amount of 45 mm is indicated by reference number 1902. In this case,
Although the correction of the edge drop was achieved as desired at the control point, mentioned above, a portion of excessive thickness occurred near the position of 20 to 30 mm separated from the control point towards the interior, such that a profile of uniform thickness does not
could be obtained. In the case with only the conventional WR crossing, increasing the crossing angle to 1.0 °, which is the maximum angle that allows the stable thread for the rolling could not be carried around a sufficient fall connection
edge as shown by 1903 representing the thickness profile. The following paragraphs describe a case where the same steel sheet is laminated with a target amount of edge drop from 0 to 5 μm in 10 mm and 25 mm positions
from the end of the sheet in this mode. The result is represented by the reference number 1904 in Figure 19. In this embodiment, the amount of displacement and the crossing angle of the tapered WRs on one side was determined as established when the sheet is laminated on the aforementioned rolling mill. . More specifically, the relationship between the crossing angle and the printing ratio is previously determined as shown, for example, in Figure 9. At the same time, an amount of displacement and an appropriate crossing angle to correct the edge drop of the laminated sheet are determined on the basis of the ratio of the amount of displacement, the printing ratio and the amount of correction of the edge drop corresponding to these operating quantities and the ratio between the crossing angle and the proportion of Print. The mentioned working cylinders are displaced by the determined amount of displacement and the control is carried out to cause the upper and lower working cylinders to cross each other at the crossover angle mentioned above. In a position of Y mm from the end of the leaf
(end of the strip), the correction amount of the edge drop necessary to achieve an objective amount of the edge drop of the rolled product is given by the F deviation obtained by subtracting the amount of the edge drop in the lamination with the customary cylinders from the target amount of edge drop. The necessary amount of edge fall correction has the ratio [amount of change in roller separations] x [print ratio] = [correction amount of edge drop]. The amount of separation between the cylinders required to correct an edge drop is expressed by [
change in cylinder spacing] = [required amount of edge fall correction] / [print ratio]. The necessary amount mentioned in the previous correction of the edge fall is therefore incorporated in
the term of the correction amount of the edge drop of the formula (1). It is assumed here that the correction amount of the edge drop at a position of 10 mm from the end of the sheet is ED10, and the amount of correction of the edge drop at a position of 25 mm
from the end of the sheet is ED25. The ratio of the amount of change in the spacing between the cylinders G, the printing ratio R and the correction amount of the edge drop ED can be expressed by the following formulas (10) and (11), because the amount of change in
The spacing between the cylinders G is dependent only on the # amount of displacement X, since the amount of taper of the working cylinders is known, the printing ratio R, not dependent on the amount of displacement X, but is dependent of the crossing angle F: 5 ED10 = GLO (X) -RIO (F) ... (10) ED25 = G25 (X) -R25 (F) ... (11) A crossing angle F and an amount of displacement X 'satisfying the above are determined by the following steps based on Figure 19. 10 Now, a form for determining the amount of displacement and the crossing angle suitable for correcting an edge drop will be described in detail with reference to Figure 4. As shown in Figure 4, schematically illustrating the relationship between the work cylinders and the S strip, the amount of change in the gap between the cylinders Gy (μm) to a position of Y mm from the end of the leaf in the case with a position of displacement EL (mm) would be as follows: 20 GlO = (1/300) X (EL = 10) X 1000 ... (12) 10 = EL for a position of 10 mm from the end of the leaf, and G25 = (1/300) x (EL = 25) x 1000 ... (13)
25 = EL for a position of 25 mm from the end of the blade. In the formulas (12) and (13) xlOOO is a coefficient to use a unit of μm. The amount of correction of the edge drop at a position of 10 mm from the end of the sheet in the case of rolling on a flat cylinder is 33 μm of Figure 19, and the amount of correction of the edge drop in a position of 25 mm from the end of the sheet is 10 μm. The printing ratio Ry necessary to correct a fall of. edge in a position Y mm from the end of the sheet for the separation between the rolls GlO and G25 would be, from the definition given in formula (1) as follows: R 10 = 33 / G10 ... (14 ) for the 10 mm position from the end of the blade, and R 25 = 10 / G25 ... (15) for the 25 mm position from the end of the blade. From the relationship expressed in formulas (12) to (15), the printing ratios at the 10 mm and 25 mm position from the end of the sheet to a displacement amount of 33 mm would be 42% for the position 10 mm from the end of the blade, and 35% for the 25 mm position from the blade end, respectively. When the amount of the displacement is smaller than 33 mm the printing ratio becomes greater than the previous one and when the amount of displacement is greater than 33 mm, on the contrary, the printing ratio becomes smaller than the previous one. . On the other hand, the print ratios for the 10 mm and 25 mm positions from the end of the sheet as determined while gradually increasing the crossing angle gradually from the ratio of the crossing angle to the distance from the end of the sheet and the print ratio as shown in Figure 9, are as shown in Table 1. Table 1
crossing angle Distance from the end of the strip (°) (mm) 10 25 0.2 38% 33% 0.3 42% 35% 0.4 47% 40% (%) print ratio
More particularly, with a crossing angle of
0. 3 °, the printing ratio is 42% for the position of
mm from the end of the blade and 35% for the position of
mm from the end of the sheet. These values coincide with the figures in the case with a displacement amount of 33 mm. These results lead to a displacement amount of 33 mm and a crossing angle of 0.3 °. Now, the amount of displacement in the case with only the rolling lamination of WR tapered on one side, conventional as described above, will be determined in the following. The amount of edge drop for the 10 mm position from the end of the sheet is 33 μm similarly to Figure 19 above, and the printing ratio Ry is 28% from the value in the case of an angle of 0 ° crossing as shown in Figure 9. The position of the displacement EL (mm) to correct the edge drop would be 45 mm as described above, as determined from the following formula (16): 0.28 = 33 / G10 ... (16) GlO = (1/300) x (EL = 10) x 1000 10 = EL In the simultaneous lamination using the displacement and crossing of WR tapered on one side of this mode, as described in the foregoing in detail to correct an edge drop as desired at the control point and to obtain a profile of uniform thickness even at the other positions along the widthwise direction, it is found that it is necessary, with an EL offset amount of 33 mm, to ensure an approximate print ratio 42% for the control point (10 mm position from the end of the blade) - and approximately 35% at the 25 mm position from the blade end. In this embodiment, as described above, a print ratio with a crossover angle of 0.3 ° is adopted from Figure 9 as the print ratio closest to the previous print ratio. By carrying out the rolling and offset rolling of WR tapered on one side, with a displacement amount of 33 mm at a crossing angle of 0.3 ° as shown by reference number 1904 in Figure 19, it was possible to obtain a profile of uniform thickness by means of the correction of the edge drop without producing an excessively thick portion even towards the interior of the central point. According to this modality, as described above, it is possible to correct an edge drop, which was impossible in the rolling displacement of WR tapered on one side, conventional or crossing only and as a result to obtain a profile of uniform thickness throughout the width.
Mode 3
The following description of another embodiment of the invention will demonstrate that it is possible in a method of rolling a strip by having the work rolls have a tapered end of the cylinder for displacement in the axial direction and causing the upper and lower working rolls intersect each other, to properly adjust a displacement amount and a crossing angle and to correct an edge drop satisfactorily, by adjusting a first control point separated from the center of the width by a prescribed distance and a second control point separate from the first control point by a prescribed distance to the end of the sheet (end of the strip) as the thickness distribution control point in the widthwise direction of the strip; control the crossing angle based on the thickness deviation at the first control point from the thickness in the center of the width and controlling the amount of displacement of the cylinder based on the thickness deviation at the second control point from the thickness at the first control point. Now, that embodiment of the method for the control of thickness of the direction in the width of the invention, will be described in the following in detail, with respect to a case of application to a cold series mill of six frames, provided with a mechanism of displacement of the cylinder that displaces the work cylinders tapering on one side and a mechanism of crossover of the cylinder that causes the work cylinders to cross each other in a first frame thereof, with reference to the drawings. The modality will be divided into modalities 3-1 * 3-2 and 3-3 for convenience of description, which will be described sequentially.
Mode 3-1
Figure 20 schematically illustrates a cold-series, 30-series laminator 30 to which the present invention is applied. A first frame 31 of this series mill 30 comprises working cylinders 10 having a tapered end on a side cylinder, a cylinder crossing controller 40 for causing the crossing of the working cylinders 10 and a cylinder displacement controller 42. to move the work cylinders 10. The work cylinders 10 can perform the crossing of the working cylinder under the instruction of the work crossing controller 40 and the displacement of the work cylinder under the instruction of the cylinder displacement controller. In the 3-1 embodiment of the invention, as shown in Figure 20, a meter 50 of the exit side profile (thickness) for measuring thickness distribution in the widthwise direction of the strip after lamination, it is provided on the exit side of a sixth end frame 36 and carries out the measurement with a cycle, for example, of 1 second. A first point of control of the thickness deviation in the widthwise direction derived from an exit of the output side profile meter 50 is provided at 100 mm from the end of the strip and a second control point is provided at 10 mm from the end of the strip. The measured values of the thickness deviation of the first control point and the second control point are defined as follows: C 100 (h.6): Deviation value of the thickness in the center of the width and in a position of 100 mm from the end of the strip as measured by the exit side profile meter 50; E 10 (h.6): Value of deviation of the thickness in the positions of 100 mm and 10 mm (second control point) from the end of the strip as measured by the profile meter 50 of the exit side; The target deviation values of the thickness of the first control point and the second control point are defined as follows: ~ C 100 (t6): The objective value of deviation of the thickness of the center of the width and a position of 100 mm from from the end of the strip (first control point); E 10 (t6): Target value of deviation of the thickness 5 from a position of 100 mm from the end of the strip and a position of 10 mm from the end of the strip (second control point). The crossover controller 40 of the previous cylinder
# determines as for a measured value of thickness C 100 (h6) of the first control point measured with the profile means 50 of the previous output side, the DELTA 100 (h6) deviation from the objective value of deviation of the thickness C 100 ( t6) of the first control point by the following formula:
? C 10Ü (6) «ClQQ (H6) - ClU0 (t6) ... (17)
Then, a connection amount of the junction of
^ cylinder Cl of the work cylinder 10 of the first frame 31 is calculated in response to the deviation DELTA ClOO asó determined (h.6). More specifically, for example the relationship between the deviation DELTA ClOO (h6) an amount
The required correction of Cl of the crossing angle of the first relative frame with that deviation is previously determined as the influence index A.
The calculation can be based on the following mathematical model.
Gl "? *? CÍ00 (h6) ... (18)
Furthermore, the cylinder displacement controller 42 mentioned in the foregoing determines as the measured value 10 (h.6) of the thickness deviation of the second control point measured by the profile means 50 from the previous output side, a DELTA E10 deviation (h.6) from the objective value of the thickness E10 (t6) of the first control point according to the following formula
TheO (d) * E10 (h6) - BlO (tfi) > «* (13)
Then, a cylinder displacement correction amount Sl of the working cylinder 10 of the first frame 31 is calculated in response to the determined deviation DELTA 10 (h6). More specifically, for example, the relationship between the DELTA deviation E10 (h6) and a required amount of correction Sl of the cylinder displacement is previously determined as the influence index B. The calculation can be based on the following mathematical model.
fil * b-AE 10 (S) ..- (20) The methods of calculating the correction quantities of the crossover angle of the cylinder and the displacement of the cylinder are not limited to those mentioned in the above, based on the model but a method that uses a table prepared from measured values (observed values) and select a required amount of correction from it can be adopted.
Modality 3-2
Figure 21 illustrates another embodiment of the invention in which a medium of profile 52 (thickness) of the inlet side is provided on the inlet side of the first frame 31 and the crossover of the cylinder and the displacement of the cylinder are controlled in base of the thickness distribution in the widthwise direction of the strip before lamination. In this embodiment, the measured value of thickness deviation between the center of the width and a 100 mm position of the end of the strip (first control point) detected by the profile meter 52 of the input side is defined as C 100 (hO) and the thickness deviation at positions 100 mm and 10 mm from the end of the strip detected by the profile meter 52 on the input side is defined as E 10 (hO). The target values for these F deviations are defined as C 100 (tO) and E 10 (tO), respectively. In this embodiment, the target values C 100 (tO) and E 10 (tO) or thickness deviations in relation to the material strip are used as thickness deviations necessary to achieve a desired thickness distribution on the output side of the sixth frame 36 final and are determined previously in response to the type of steel and the thickness program based on the rolling results
real. With respect to the method of calculating a correction amount of the crossover of the cylinder Cl and the amount of correction of the displacement of the cylinder S i, which is the same as that in the previous mode, here one omits a
detailed description. The distribution of the thickness of the direction to the width of the strip material before rolling can be measured, for example in the case of cold rolling, by installing a thickness profile meter on the side
of the cold rolling mill on the exit side of hot rolling or between hot rolling and cold rolling, or measuring off-line.
Modality 3-3
Figure 22 illustrates a mode 3-3 of the invention, using simultaneously a profile meter 50 on the output side as in mode 3-1 and a profile meter 52 on the input side as in mode 3-2. In mode 3-3, a switching unit 60 is provided for switching (a) control by the cylinder crossover controller 40 and the cylinder displacement controller 42 operable in response to an output of the profile meter 50 from the side of the cylinder. output prior to (b) control by the cylinder crossing controller 40 and the cylinder displacement controller 42 operable in response to an output of the profile meter 52 from the previous input side and vice versa. According to track tracking of the welding points joining a preceding steel sheet and a following steel sheet, the switching unit 60 performs a feedback control of the cylinder crossing and displacement of the cylinder in response to an output of the cylinder. 50 profile meter on the output side. The switching unit 60 backwards the control again for the feedback control performed in response to the exit of the output side profile meter 50 at the point when the welding point reaches the positioning of the outlet side profile meter 50. .
In the steady state, according to this mode 3-3 it is possible to control with certainty the thickness distribution on the output side of the sixth final frame 36 in response to the output of the profile meter 50 on the output side and although the point of welding passes through the laminator 30 in series, performs proper control of the feed forward under the effect of the output of the profile meter 52 on the input side.
Typical Results of the Application of Modality 3
A steel sheet for tinplate is collected after hot rolling, which has a width of 900 mm, rolls 20 rolls. The average values of the ratio of
loss (proportion of rejection of the thickness in the width direction) that represents the proportion of the thickness distribution in the positions of 100 mm and 10 mm in the longitudinal direction of the steel sheet, which comes from a prescribed control range are compared in Figure 23 between a case
using only the working cylinder displacement and mode 3-1 of the invention. The taper had a shape that has a radius reduced by 1 mm by 300 mm in length in the direction of the cylinder (taper: 1/300).
This confirms that mode 3-1 leads to approximately an extraordinary improvement of the width distribution in the width direction over that in the conventional method. 5 The availability of a similar result in mode 3-2 could also be confirmed.
Modality 4 ^^
The following description of another industrial embodiment of the invention, will show that it is possible to adjust appropriately a displacement amount and crossing angle and to correct a edge drop satisfactorily, by calculating a correction amount of
the edge fall necessary to correct the edge drop based on a thickness distribution of the strip as a measure after the laminator carrying the control of the amount of displacement and the amount of crossing. Figure 24 is a side view, including a
block diagram, illustrating a schematic configuration of a cold rolling mill series mill, comprising 6 frames in total used in the edge fall control method of this mode. This series rolling mill comprises 4 cylinders
High displacement and crossing provided with the working cylinders F tapered on one side, only on a first frame. The working cylinders 10 of the first frame are moved by a displacement operator 12 and are caused to cross each other by a crossover operator 14. A thickness profile meter 50 provided on the output side of a sixth frame (FIG. output side of the laminator) measures an amount of edge drop at a prescribed control point on the strip. The quantity thus measured of the edge drop is entered into a controller of
. Feedback 32. The controller 32 calculates a deviation (amount of edge fall correction) of this measured value that is entered as above from a target amount of an edge drop that is entered separately from a unit. of adjustment 34. One
The amount of displacement and a crossing angle necessary to dissolve the deviation is calculated and these operating quantities are sent to the forward displacement operator 12 and the crossover operator 14 to control the first rolling frame. In controller 32, as described in
above, the feedback control is carried out to achieve equalizing the amount of edge drop measured on the output side of the final frame with the target value. More specifically, the controller 32 maintains the
data considering the relationship between a predetermined crossover angle and the influence index. An amount of displacement and an index of influence that give the previous necessary amount of correction or drop of edge according to principle described later in detail and based on the ratio of the amount of displacement, the influence index and the amount of correction of the edge fall that corresponds to those operation quantities. An amount of displacement and a crossing angle necessary to dissolve the previous deviation are calculated by determining a
crossing angle that gives a desired influence index based on the relationship between the crossing angle and the influence index. Now, the principle of feedback control performed in this mode will be described in the following.
[15] Extensive studies on lamination were carried out simultaneously using the WR offset taper on one side and the WR junction (WR offset rolling / tapering on one side only), and it was found that not only the edge fall on the side
exit from the offset rolling / crossover of WR tapered on one side (control frame), but also for an edge drop after another lamination on an ordinary lamination (frame) downward (eg on the output side) of the final frame) when compared to a single
WR offset lamination tapered on one side, the ratio of the amount of change in the edge drop to the amount of change in the gap between the rolls caused by a shift in the shift position (hereinafter referred to as the "influence index") increases and the change in the influence index depends on the crossing angle. Figure 25 illustrates the amount of change in edge drop on the exit side of the lamination of the final frame (sixth frame) in the lamination of a sheet steel sheet with the use of the tapered WR on one side of a 1/300 taper installed in the first frame, with various crossing angles in the range of 0 to 0.5 ° at 0.1 ° intervals and quantifies the displacement range from 0 mm to 50 mm. It is known from Figure 25 that in spite of the same amount of taper of the work rolls, a larger crossing angle leads to a larger amount of change in the edge drop. Figure 26 illustrates the influence index at each of the crossing angles mentioned in the above; a larger crossing angle results in a large influence rate. This is attributable to the fact that, when compared to the single displacement of tapered WR on one side, the simultaneous use of the WR offset and tapering on one side results in a deep tilt of the tapered portion, leading to a decreased lamination load and a considerable increase in material deformation, resulting from an increase in tension at the ends of the strip and this greatly amplifies the effect of correction of the edge drop by the tapered portion, the extraordinary amplification It is an unexpected discovery. In this mode, edge fall control is performed as follows in accordance with these findings. The edge drop control will now be described
in the following with the assumption that the control is performed at two control points, including the positions of a mm and b mm from the end of the sheet (end of the strip) (a = b). The amount of falling edge is a deviation in thickness between a reference position in
a prescribed distance from the end of the sheet and the control point and the direction towards a thinner thickness is defined as positive. Here it is assumed that the target amount of edge fall for the positions a mm and b mm is T (a) and T (b),
respectively. The observed amounts of the edge drop El (a) and El (b) at the control points at one point during rolling with a crossing angle Fl and an amount of displacement ELI mm are defined as follows:
F The (a): The thickness deviation in the position a mm from the end of the leaf of the reference position as measured by a thickness profile gauge; (B): The thickness deviation at the 5 b mm position from the leaf end of the reference position as measured by a thickness profile gauge. In this embodiment, the feedback control of changing the amount of displacement and crossover angle of tapered WR on one side is carried out in such a manner that the observed amount of edge drop equals the target amount of the fall. of edge. In this control, the amount of edge drop correction, to correct an edge drop of the material to be rolled is equal to the DELTA E deviation between the observed amount of the edge drop 15 and the target amount of fall of the edge. edge at each control point and is calculable by any of the following formulas:
? E (?) * The (a) - * (a) ... (21)? E (b) «Bl < b > - T (b) '... f22.
The displacement amount is changed from ELI to
EL2 and the crossing angle from Fl to F2 through the feedback control. If the influence indices for the angles Fl and F2 are Kl and K2, respectively, these indices * depend on the crossing angle. The influence indexes can therefore be expressed as functions of the following formula:
K1"K (ßl),., 23)
K2"K (M),., (24)
The following relational formulas are available from the DELTA E (a) and DELTA E (b) deviation from the observed amounts of the falling edge aa mm and b mm from the end of the sheet from the target amount of the edge drop, and separations between cylinders Ga (X) and Gb (X) in a mm and b mm from the end of the sheet with an amount of displacement EL, where L is a quantity of taper:
Ga (X) ». (EL - a) ... < 2S)
Gb (X) * L * (BL - ü) ... < 26)
Sta) * GA (X2) * K2 - £ 3a (Xl) .Kl, ", (7)
4E (b) = CÍb (X2) *? Í2 - Gb (Xl) .Rl ... Í2QJ
By incorporating the formulas (25) and (26) into the formulas (27) and (28), and resolving it with respect to K2 and EL2, the following formulas (29) and (30) are available.
K2 - Kl * L- (a - b) «1000 - ¿E (a) +? E (b) > /. { «(A - b) * 1000) ,,, j29)
B 2 -. { ?AND. { a) .b - AB (b) -lOOÜ) - »Xl.?l* < ? - b) .iQ0ü > /. { ? E (?) -? E (b) + EL1 - aj «l * 1000 -. < EL1 - b) * Kl »iQ00} ... 30)
An intersecting angle F2 giving an influence index K2 is selected from the previously determined relationship between the crossing angle and the influence index. The WR tapers on one side are made to cross each other at this crossing angle and change the shifting position thereof until the amount of displacement becomes EL2. Now, the following paragraphs describe, as a concrete example, a case where a sheet of steel for tinplate having thickness of 900 mm, collected after hot rolling, is laminated in a series mill shown in Figure 24. The positions 10 mm and 30 mm from the end of the blade were selected as control points for the amount of the edge drop., And the objective of the edge drop is 0 μm for the individual positions. The amount of taper of the work rolls is 1/300. The relationship between the crossing angle of the working cylinders and the amount of change in the edge drop is the same as that shown in Figure 25. The relationship between the crossing angle and the influence index is the same as that shown in Figure 26. The reference number 2701 in Figure 27 shows the observed amount of the edge drop measured by the profile meter 50 from the previous output side during rolling with a crossing angle Fl = 0o and an amount of displacement ELI = 35 mm. Since El (10) = 8 μm and El (30) = 4 μm, and with a crossing angle of 0o, the influence index Kl = 0.03, the influence index K2 with a crossing angle after the change and the displacement amount EL2 after the change, are K2 = 0.09 and EL2 = 45 mm, of the formulas (29) and (30). From Figure 26, the crossing angle that gives an influence index of K2 = 0.09 is determined to be 0.4 °. Based on this result, the crossing angle was changed from 0o to 0.4 ° and the amount of displacement, from the 35mm position to the 45mm position. The resulting thickness profile is indicated by the reference number 2702 in Figure 27. The edge drop was successfully corrected, resulting in a uniform thickness profile in the widthwise direction. For comparison purposes, the edge drop in the 30 mm position from the end of the blade is controlled to the target value of 0 μm with only the work cylinder moving without crossing the work roll. The result of the control is indicated by the reference number 2703. In the comparative example, if the displacement position is 75 mm, the observed amount of the edge drop becomes 0 μm to a position of 30 mm from the end of the sheet (DELTA and o overlap in Figure 27). At a position of 10 mm from the end of the sheet, however, the amount of the edge drop becomes greater than about 4 μm and at about 40 to 60 mm from the end of the sheet, the thickness becomes excessively large, thus avoiding achieving a uniform thickness profile in the widthwise direction. According to this embodiment, as described above, it is possible to improve a more successful edge drop than the conventional method. Although a method that uses mathematical models as expressed by formulas (29) and (30) is used for the calculation of a necessary amount of correction of the crossing angle and the amount of displacement, no other method uses such model formulas It is also applicable. For example, a determination method using a table prepared with the actual result data may also be applicable. Therefore, it is advantageous to calculate a correction amount of the edge drop necessary to correct an edge drop on the basis of a thickness distribution of the sheet material measurement after lamination (control frame) which controls the amount of displacements and the amount of crossing of the working cylinders, by which allows the appropriate adjustment of a displacement amount and a crossing angle, and the satisfactory correction of the edge drop.
# Modality 5 The following description of an embodiment of the invention, will demonstrate that it is possible, in a laminating method, to provide a strip for continuously laminating a strip on a laminator in series, comprising a plurality of laminators.
racks, for appropriately tapering an amount of displacement and a crossing angle and for correcting a edge drop satisfactorily, providing a mechanism for the displacement working cylinders having in each a tapered end and a mechanism of having a crossing of
the upper working cylinders and one lower one on top of the other in at least one of the frames except for the frame on the downward side, which predicts a thickness distribution in the widthwise direction on the output side of the first frame to provide a
thickness distribution in the widthwise direction on the output side of the series mill, using the thickness distribution predicted as a target thickness distribution on the output side of the first frame, and causing the work rolls to move and cross each other in the first frame. When means are provided for changing the thickness distribution in the widthwise direction of the strip of material, such as a mechanism for moving the cylinder or a mechanism for the crossing of the cylinder in a
upstream of the end frame of the series mill, the amount of edge fall on the exit side of the mill in series (exit side of the end frame) is determined from the thickness deviation in the widthwise direction of the material strip, the class of the
material strip, the thickness program and the rolling conditions that include the rolling load of the individual frames, in addition to the thickness profile on the output side of the control frame provided with the medium to change the thickness distribution in the direction
across. The amount of the edge drop here is defined as follows. In the strip of material, as shown in Figure 28, the thickness deviation between the center of the width and a position of z mm from the end of the sheet is
defined as the amount of edge fall Hz for the position of z mm from the end of the sheet. On the exit side of the control frame, as shown in Figure 29, the deviation of the thickness between the center of the width and a position of y mm from the end of the sheet is defined as the amount of falling edge. DCy in the position of y mm from the end of the sheet. In addition, on the exit side of the series laminator (final frame), as shown in Figure 30, the thickness deviation between the center of the width and a position of x mm from the end of the
the sheet is defined as the amount of edge drop EDx (target value: EDTx) for the placement of x mm from the end of the sheet. Now, the stages for the control of the edge fall in this modality will be described in detail with
Reference to Figure 31. First, an objective amount of edge drop EDTx on the output side of the series mill is adjusted (Step 100). Then, a profile of objective thickness on the side
The output of the control frame necessary to obtain the above target amount of the edge drop EDTx is calculated based on the rolling conditions such as rolling load for individual frames (Step 110). In this calculation a mathematical model that simulates the
The behavior of an edge drop on the output side F of each frame was previously prepared by means of experiments and it is possible to determine the target profile on the output side of the control frame based on this model formula by means of the type of material strip, 5 thickness program, rolling conditions, such as rolling load for individual racks and the target amount of EDTx edge drop. Then, the established values of cylinder displacement and / or cylinder crossing necessary
to obtain an objective thickness profile on the output side of the control frame are calculated based on the thickness distribution of the strip of material measured at an arbitrary point on the input side of the mill and the rolling conditions in the control frame (Stage
120). For these established values of cylinder displacement and cylinder crossing also, mathematical models that simulate the relationships between cylinder displacement and / or cylinder crossing and thickness profile on the output side of the cylinder frame.
control, they are prepared previously and it is possible to calculate adjustment values of cylinder displacement or / and cylinder crossing necessary to obtain a profile of objective thickness on the exit side of the control frame at the base of these models with the thickness distribution of the strip of material and under the conditions of lamination in the control frame. Then, the displacement of the cylinder or / and crossover of the cylinder is adjusted over the established quantities 5 calculated in this way (Step 130) and the rolling is carried out in this way (Step 140). In the invention as described above, the edge drop occurring in the frames on the downward side of the edge drop control frame is taken into consideration and it is possible to obtain a target edge drop exactly on the side of exit of the final frame.
Example of Application of this Modality 15 Figure 32 is a side view, which includes a
# block diagram illustrating a schematic configuration of a cold mill of six racks, applied in the edge fall control method of this mode. He
The first frame serves as the control frame and is provided with a mechanism that crosses the working cylinder to cause the crossing of a pair of upper and lower working cylinders 71A and 71B and a displacement mechanism of the working cylinder to displace these.
work cylinders.
F The upper and lower work cylinders 71 A and 71B in the first frame serve as the control frame that can carry out the work displacement and the work roll crossing under an instruction of a
displacement / crossing operator 92. The tapers HA and
11B are provided as shown in Figure 33, at the lateral ends of the work cylinders 71A and 71B
S_ upper and lower. S is a strip of material that is going to be
"Laminated" 10 The taper imparted to working cylinders 71A and 71B has such a form, that the diameter of the cylinder converges by 1 mm by 300 mm from the length of the barrel of the cylinder (taper 1/300). the direction of the width of the strip of material before the
lamination is measured by a detector installed on the output side of the hot rolling mill, which is the preceding process and is transmitted from there. In Figure 32, 72 to 76 are working cylinders of numbers 2 to 6 frames and 81 to 86 are backup cylinders of numbers 1 to 6
racks. Reference numeral 94 is a target thickness profile adjustment unit on the output side of the control frame, which adjusts a target thickness profile EDCy on the output side of the control frame (first frame) based on the Lamination conditions of
the numbers 2 to 6 frames on the down side, the target value of the EDTx edge drop and the material conditions (thickness profile, steel type and sizes). Also in Figure 32, 96 is a unit that calculates the cylinder offset / cylinder crossover adjustment value, which calculates the set values EL and F of cylinder displacement and cylinder crossover in response to the EDCy target profile in the output side of the control frame as it is made to enter from the lens profile adjustment unit 94 on the output side of the control frame, the rolling conditions of the control frame (first frame) and the deviation of the material Hz. The edge fall control was performed by cold rolling a tinplate steel sheet, collected after hot rolling, according to the rolling conditions shown in Table 2. Table 2
* i Input side voltage: 2 kgf / mm2 ** í Thickness at the inlet side: 2.0 mm The target amount of the edge drop EDTx at the exit of the end frame (sixth) is a fall drop amount of 0 μm at a position of 10 mm from the end of the sheet and this is expressed in the form of EDT10 = 0. First, a thickness deviation profile EDCy is calculated on the output side of the control frame (first frame ) necessary to obtain a target amount of falling edge EDT10 on the exit side of the final frame (sixth frame). The amount of edge drop Ex on the output side of the final frame is determined in response to the thickness deviation profile on the output side of the --- control frame, the type of material to be laminated, the program of thickness, and the rolling conditions including the rolling load for individual frames. In this mode, a model form prepared as follows is employed. The model formula is prepared by discontinuing the laminator operation in the laminate half, carrying out an experiment (fastening) to sample sample sheets on the output side of the individual frames, measuring a thickness deviation for each sample and investigating the behavior of the edge drops on the output side of each frame. The model formula prepared in order to calculate a thickness deviation EDCy at a position of y mm from the end of the sheet (see Figure 29) on the output side of the control frame as the thickness profile, as shown in following formula, from the resistance to deformation S of the material strip, the amount of edge drop EDx (see Figure 30) on the output side of the final frame (sixth frame) and the rolling conditions for the Racks down to under the control frame (first frame) include the thicknesses of the output side Hn for each frame on the down side, the rolling load Pn, the tension on the output side Tn, the diameter of the working cylinder WRn (where n is the frame number in all cases):
EDCy * S (S, EDx, Hn, Pn, Ün, «Rn) ... (31)
In this mode, the frames number 2 to 6 are down to the control frame: frame no. n = 2 to 6. Due to the control position it is 10 mm from the end of the sheet, EDx = ED (see Figure 30) and in this case the thickness deviations EDC 10 and EDC 30 (see Figure 20) for the positions of y = 10 mm from the end of the sheet ey = 30 mm from the end of the sheet, it is used as thickness profiles. A target thickness profile EDC 10 and EDC 30 in the control frame (first frame), necessary to obtain an objective value of the edge drop EDT 10 on the output side of the final frame (sixth frame) is calculated by means of the model formula (31) above, Then, the established cylinder displacement and cylinder crossing quantities necessary to obtain the target thickness profile EDC 10 and EDC 30 of the first frame are calculated. For these adapted quantities of cylinder displacement and cylinder crossing as well, models of the ratio of cylinder displacement and crossover of the cylinder to the thickness profile on the output side of the control frame were previously prepared based on the results of the experiments of subjection or experiments on a laminador of a single previous frame. In this embodiment, an amount of displacement EL and a crossing angle F are determined in the following stages. First, a crossing angle F which gives a target profile of EDC 30 on the central side of the strip between the objective profiles is determined. That is, assuming that the lamination without performing the control of the edge drop (the amount of displacement and the crossing angle are zero), the crossing angle F is changed to correct the thickness profile to eliminate the deviation between the profile of thickness E (30 H25) on the output side of the first frame with y = 30 mm and z = 25 mm and the target profile EDC 30. When the thickness profile of the material strip is Hz (see Figure F) , for the determination of the thickness profile E (y,
Hz) in a position of y mm from the end of the strip on the exit side of the first frame, while the lamination without performing the control of the edge drop, the
The ratio between the thickness profile Hz of the material strip and the thickness profile at a position of y mm from the end of the strip on the output side of the control frame must be determined previously by means of experiments. An improvement in the thickness profile due to a change
in the crossing angle, can be expressed by a product of the separation between the cylinders H (x, F) resulting from crossing in the position of y mm from the end of the strip, as multiplied by the index of influence (printing relation) a. A model formula that expresses this relationship is
as follows: EDC 30 - E (30, H25) - a »H (30,?) ... (32)
After determining a crossing angle F which satisfies the formula (32), an amount of displacement EL which gives an EDC target profile 10 (see Figure 29) among the target profiles under the crossing angle F is calculated. The thickness profile is improved by displacement to eliminate a deviation between the thickness profile C (10, H25, F) to a position of 10 mm from the end of the strip on the exit side of the first frame and the EDC target profile 10, when they rotate with a crossing angle F with a thickness profile of H25 of the strip of material. In step C (y, Hz, F) it represents the thickness profile at a position of y mm from the end of the strip on the output side of the first frame when it rotates with a crossing angle F with a thickness profile of the strip of material DHz. The improvement of a thickness profile by displacement, can be expressed by the ratio of a product of the separation between the cylinders G (x, EL) to a position of y mm from the end of the strip that results from an amount of displacement EL alone, as multiplied by the influence index (print ratio) b. This relationship is expressed by the following model formula:
EDC 10 - C { 10, H25, e) - b-G (x, EL) (33)
An amount of displacement EL satisfying this formula (33) is therefore calculated. Although the above description, a crossing angle F was determined first and then an amount of displacement EL is calculated, a crossing angle F and an amount of displacement EL can be determined simultaneously by a technique comprising the steps of, in the expression of a model formula the ratio of the crossing angle F and the amount of displacement EL with the thickness profile on the exit side of the first frame, which defines a deviation between a thickness profile and a target value as the control function and optimize this control function. The thickness profiles for two positions are determined in the description above, as the profile of target thickness on the output side of the first frame, while the thickness profiles of more positions can be provided as targets. Each 20 rolls were laminated by the edge drop control of this mode and by the conventional edge drop control without taking into account the presentation of the edge drops in the subsequent frames for the control frame, to compare deviations between a target edge drop and an observed edge drop. The result is shown in Figure 34. As is clear from Figure 34. The present invention makes it possible to achieve the improvement of the edge drop higher than that by the conventional method.
Modality 6
The following description of an embodiment of the invention, will demonstrate that it is possible in a method for the continuous rolling of a strip in a series mill, comprising a plurality of frames, which comprises the * steps of controlling the displacement of the rolls of work which each have a tapered end in the axial direction and controlling the crossing of the upper and lower working cylinders in at least two of the plurality of frames, to appropriately establish an amount of displacement and a crossing angle and to improve satisfactorily the fall d edge, by: perform a control of displacement of the cylinder
* work and control the crossing of the working cylinder in
the front side frames between the two or more frames that are subjected to the displacement control and crossover control, based on a distribution of thickness detected in the upper part of the front side frames; and 15 performing a displacement control of the working cylinder and the crossing control of the working cylinder in f the front side frames between the two or more frames to be subjected to the displacement control and the crossover control, based on of a
thickness distribution detected in the downward part of the rear side frames. Now, the method of the thickness control method in the width direction of the invention will be described in the following in detail with reference to the
drawings, for an application example for a rolling mill in F r ^ cold rolling series, of six frames provided with work cylinders tapered on one side on the first and sixth end frames, a cylinder displacement mechanism for moving the work cylinders and a cylinder crossing mechanism to make the work cylinders cross each other. In Figure 35 is a schematic view illustrating a cold rolling mill series 30, of six
* frames for the application of the present invention. A first frame 31 of this laminator 30 in series providing with the work cylinders 10 tapered on one side, a first operator crossing the cylinder of the frame to cause the work cylinders 10 to cross each other, and a first cylinder of frame that displaces the
operator 62 for the displacement of the work cylinders 10. The work cylinders 10 can carry out
^^ Ws the crossing of the working cylinder under an instruction of the first frame cylinder displacement operator. A sixth end 36 frame is also provided
with the work cylinders 10 tapered on one side, an operator 63 that crosses the cylinder of the sixth frame to cause the work cylinders 10 to intersect each other and a cylinder displacement operator 64 to move the work cylinders 10. The cylinders of
work 10 can perform the crossing of the work cylinder F under an instruction of the cylinder crossing operator 63 of the sixth frame and move the work cylinder under an instruction of the cylinder displacement operator 64 of the sixth frame. In this embodiment, a profile meter (thickness) 52 of the input side is provided for measuring the thickness distribution in the widthwise direction of the strip of material before lamination on the input side of the first frame 31 and a profile 50 meter (thickness) of
The outlet side for measuring the thickness distribution in the widthwise direction of the rolled product on the exit side of the sixth end frame 36, carrying out the measurement in a cycle, for example, of one second. Now, a first point of control of a deviation
of the thickness in the width direction derived from an input side outlet and the meters 52 and 50 of the outlet side profile are adjusted to a position 25 mm from the end of the strip and a second control point, in a position of 10 mm from the end of the strip and the values
The measured values of the thickness deviations in the first and second control points of the material strip are defined as follows: C 25 (hO): measured value of the thickness deviation between the center of the width and a position of 25 mm # from the end of the strip (first control point) as measured by the profile meter 52 on the input side; E 10 (hO): measured value of the thickness deviation between the 25 mm and 10 mm positions (second control point 5) from the end of the strip as measured by the profile meter 52 on the input side. The target values of the thickness deviations of the first and second control points similarly in the material strip are defined as follows: 10 C 25 (tO): objective value of the thickness deviation between the width and a position of 25 mm ( first control point) from the end of the strip; E 10 (tO): target value of the thickness deviation between the 25 mm and 10 mm positions (second control point 15) from the end of the strip. Similarly, the measured values of the
The thickness deviation of the first and second control points in the rolled product are defined as follows: C 25 (h.6): measured value of the deviation of the thickness between the center of the width and a position of 25 mm (first control point) from the end of the strip, as measured by the meter 50 of the output side profile; E 10 (h.6): measured value of the thickness deviation between the 25 mm and 10 mm positions (second "control" point) from the end of the strip, as measured by the profile meter 50 on the side of the strip Similarly, the target values of the thickness deviation of the first and second control points in the rolled product are defined as follows: • C 25 (t6): target value of the thickness deviation between the center of the width and a position of 25 mm (first control point) from the end of the strip, E 10 (t6): target value of the thickness deviation between the positions of 25 mm and 10 mm (second control point) from the end of the the strip When there is a change in the measured values C 25
(hO) and E 10 (hO) measured by the front-end side profile meter 52 during rolling, the first frame controller 65 calculates operating quantities of the working cylinder by displacement and crossing the working cylinder of the first frame 31 in response to such a change.
More specifically, for the measured value of the thickness deviation C 25 (hO) or the first control point measured by the side entry profile meter 52, a DELTA deviation
C 25 (tO) of the target value of the thickness deviation C
(tO) of the first control point was calculated according to the following formula: DELTA C 25 (hO) = C (hO) - C 25 (tO) ... (34) Then, a correction amount of the The cylinder of the working cylinder 10 of the first frame 32 is calculated in response to the deviation thus determined DELTA C 25 (hO). Specifically, for example, the relationship between the 5 DELTA C 25 (hO) deviation and the necessary correction amount Cl of the crossing angle of the first corresponding frame for that deviation was previously determined as the influence index and the calculation can be performed by the following model formula: 10 Cl = a- DELTAC 25 (hO) ... (35) In addition, for the measured value of the thickness deviation of E 10 (hO) the second control point as measured by the meter 52 of Inlet side profile, the first frame controller 65 determines the DELTA E 10 15 (hO) deviation from the target deviation value E 10 (hO) of the first control point according to the following formula: DELTA E 10 (hO) = E (hO) = E 10 (tO) ... (36) Then, in response to the determined deviation 20 in this DELTA 10 (hO) form, a correction amount Sl of cylinder cylinder displacement 10 of the first frame 31 is calculated. In detail, for example, the relationship between the DELTA E 10 (hO) deviation and the amount of correction necessary for cylinder displacement was previously determined as the influence index b, Sl can be calculated by means of the following model formula: Sl = b- DELTA 10 (hO) ... (37) The sixth frame controller 66 calculates, by
On the other hand, the operation quantities of the displacement of the working cylinder and the crossing of the working cylinder of the sixth frame 36 to achieve an objective profile in the rolled product, that is to eliminate a deviation between a measured value of the lateral output profile after the
laminate and the objective profile. More specifically, for the measured value of the thickness deviation C 25 (h.6) of the first control point as measured by the side exit profile meter 50, the DELTA C 25 (h.6) deviation from the target value of the C 25 deviation of the thickness
(t6) of the first control point is calculated by the following formula: DELTA C 25 8h6) = C 25 (h6) = C 25 (t6) ... (38) Then, in response the deviation determined in this DELTA form C 25 (h6), the correction amount of
The cylinder crossing of the working cylinders of the first frame 31 is calculated. For example, it is calculated from the following model formula by previously determining the relationship between the DELTA C 25 deviation (h.6) and the amount of the necessary C 6 correction of the crossover angle of the sixth
frame as the influence index c: 'C6 = c-DELTA C 25 (h6) ... (39) In addition, for the measured value of the thickness deviation E 10 (h.6) of the second control point as is measured by the output side profile meter 50, the controller 5 65 of the sixth frame calculates the DELTA E 10 deviation (h.6) from the target value of the thickness deviation E 10 (t6) of the first control point by the following formula: I DELTA E 10 (h.6) = E 10 (b.6) = E 10 (t6) ... (40) Then, in response to the DELTA E 10 deviation
(h.6), thus determined, the correction amount S6 of the displacement of the cylinder of the working cylinders of the sixth frame 36 is calculated. Specifically, the relationship between the deviation DELTA E 10 (b.6) and the amount of correction needed S6 of the cylinder displacement is
previously determined how the influence index d and S6 can be calculated by means of the following model formula: S6 = d-DELTA 10 (h6) ... (41) The method to calculate the correction amount of the crossover angle of the cylinder or the amount of
The displacement of the cylinder is not limited to that based on the previous model formula, but a method of selecting a necessary amount of correction by the use of a table prepared based on the actually measured values. In the case of cold rolling, for example the thickness distribution in the width direction in the strip of material before rolling can be measured by means of a thickness profile meter on the input side of the rolling mill in cold, on the exit side of hot rolling mill, or between two hot and cold rolling mills. It can be measured on the line. Furthermore, the adjustment of the individual control points is not limited to the shape described in this embodiment, but the first control points can be established in a 100 mm position from the end of the strip.
Example of Application of this Modality
The following paragraphs describe a case of application of this modality to a cold rolling mill, of six frames provided with work cylinders tapered on one side on the first and the sixth frames, a displacement mechanism of the cylinder displaces the working cylinders and a mechanism that crosses the cylinder causing the work cylinders to cross each other. A steel sheet for tin sheet, is rolled for 20 rolls, The average values of the loss ratio (rejection ratio of thickness the direction of width) which represents the proportion of the thickness distribution the position of 25 mm and 10 mm from the edge in the longitudinal direction of the steel sheet, which comes in a prescribed control range are compared in Figure 35 between a conventional case using only the displacement of the working cylinder and this embodiment of the invention. The taper has a shape having a radius reduced by 1 mm by 300 mm in length in the barrel direction (taper: 1/3000). This allows the confirmation that the invention brings about an extraordinary improvement of the thickness distribution in the widthwise direction more superior for that in the conventional method. Several modalities or complete examples of the application have been presented in the above. The configurations of the lamination accessories for which the present invention is applicable are not limited to those shown in this embodiment. For example, lamination is not limited to lamination of four heights or six heights, but may be a two-level lamination. The number of frames is not limited to 6 or 5 as shown in the modalities, but the invention is still applicable as a lamination of a single frame, and the number of frames is arbitrary. The frame provided with mechanisms of displacement and crossing of the tapered work cylinders, is not limited to the first frame, but can be any of frames and is not limited to a single frame, if a plurality of frames can not be used. The work cylinders can be a criss-crossed pair in which the work cylinders cross each other in pairs with the back-up cylinders. The strip of material to be laminated is not limited to a steel sheet, if it can not be an aluminum sheet, a copper sheet or any other sheet of metal. The tapered work cylinder is technically not limited to a tapered cylinder on one side. It is sufficient that at least one end of the cylinder is tapered. Furthermore, the tapered cylinder can technically be any of the upper and lower working cylinders: for example even only the upper tapered working cylinder or only the lower tapered cylinder could have sufficient advantages.
Claims (23)
1. A method of laminating a strip to reduce an edge drop, causing the work rolls to each have a tapered end for displacement in the axial direction and having the upper and lower work rolls crossed with each other, which method is characterized in that it comprises the steps of: (a) determining a displacement amount and a crossing angle as operating quantities necessary to correct the edge fall of the strip; and (b) causing the work rolls to move by the amount of displacement thus determined and having the work rolls crossed with each other at such a determined crossing angle.
2. The method of lamination of a strip to reduce an edge drop according to claim 1, characterized in that the amount of displacement and the crossing angle are determined by the steps of: (a) determining an amount of correction of the fall of edge required to correct the amount of the edge fall of the strip at a target value; and (b) determining a displacement amount and a crossing angle, necessary to correct the edge drop of the strip based on the ratio of (I) an amount of displacement, (II) a crossing angle, and (III) ) a correction amount of the edge drop in relation to (I) and (II).
3. The method of lamination of a strip to reduce an edge drop according to claim 1, characterized in that the amount of displacement and the crossing angle are determined by the steps of: (a) providing a separation between the cylinders, effective for the reference position in a position at a central distance from one edge of the strip; determining a quantity of the gap between the cylinders necessary to obtain a desired amount of correction of the edge drop, based on the ratio between a quantity of separation between the cylinders, between the upper and lower working cylinders in relation to the position of reference and the quantification of correction of the edge drop; and (b) determining a displacement amount and a crossing angle that leads to the amount of the separation between the cylinders based on the ratio of the amount of the separation between the cylinders to the amount of displacement and the crossing angle.
4. The method of lamination of a strip according to claim 1, characterized in that the amount of displacement and the crossing angle are determined by the steps of: (a) determining an amount of correction of the edge drop necessary to correct the amount of the edge fall of a strip at a target value, based on the previously determined ratio between the crossing angle and the ratio of the correction amount of the edge drop to the amount of change in the gap between the rolls; and (b) determining a displacement amount and a crossing angle necessary to correct the edge drop the strip based on the ratio of the amount of displacement, the ratio of the amount of correction of the edge fall to the amount of change in the separation between the cylinders, the ratio of the amount of correction of the edge fall with it and the ratio of the crossing angle and the ratio of the amount of correction of the edge fall with the amount of change in the separation between the cylinders.
5. The method of lamination of a strip to reduce an edge drop according to claim 1, characterized in that the amount of displacement and the crossing angle are determined by the steps of: (a) determining a correction amount of the fall of edge, necessary to correct a quantity of the falling edge of the strip at a target value, based on a previously determined relationship between the crossing angle and the proportion of the correction amount of the fall of 10 edge for the amount of change in the separation between the cylinders; and (b) determining a displacement amount and a crossing angle, necessary to correct the edge fall of the strip based on the amount of displacement, the 15 ratio of the amount of correction of the edge drop to the amount of change in the separation between the rolls, the ratio of the amount of correction of the edge drop and the ratio between the cross angle and the proportion of the amount of correction of the edge drop to the amount of 20 change in the separation between the cylinders.
6. The method of lamination of a strip to reduce an edge drop according to any of claims 1 to 5, characterized in that at least two 25 control points of the amount of edge drop of the strip are provided on one side in the widthwise direction and the amount of edge drop on the control points of the edge drop is controlled.
7. The method of lamination of a strip according to claim 1, characterized in that the method comprises the steps of: (a) establishing a first control point separated from the center of the width by a prescribed distance and a 10 second control point separated from the first control point by a prescribed distance to the lateral edge of the sheet as control points of the thickness distribution in the widthwise direction of the strip; (b) calculating a thickness deviation at the first thickness control point at the center of the width and a thickness deviation at the second control point from the thickness at the first control point, from a thickness distribution detected in the direction across the width of the strip; 20 (c) control the crossing angle based on the thickness deviation at the first thickness control point in the center of the width and control the amount of displacement of the cylinder, based on the thickness deviation at the second point of thickness control in the 25 first checkpoint.
8. The method of lamination of a strip according to any of claims 1 to 7, characterized in that an amount of edge fall correction necessary to correct the edge drop is calculated based on the thickness distribution of the strip as measured , before the laminator carries out the control of the amount of displacement and the amount of crossing that will be controlled.
9. The method of lamination of a strip according to any of claims 1 to 7, characterized in that an amount of correction of the edge drop necessary to correct the edge drop, is calculated based on the thickness distribution of the strip as was measured after the laminator carries out the control of the amount of displacement and the amount of crossing are to be controlled.
10. The method of lamination of a strip according to any of claims 1 to 7, characterized in that an amount of correction of the edge drop necessary to correct the edge drop, is calculated based on the thickness distribution of the strip as it is measured before the laminator for which the amount of displacement and the amount of crossover, are to be controlled and based on the thickness distribution of the strip as measured after the laminator carries out the control of the laminator. amount of displacement and the amount of crossing that will be controlled.
11. A method of laminating a strip to continuously laminate a strip in a series laminator including a plurality of frames, which is characterized in that it comprises the steps of: providing a mechanism for moving the work rolls each having a tapered end and a mechanism having upper and lower working cylinders crossed with each other in at least one of the frames upwards of the final frame to cause it to serve as a control frame; (a) determining a displacement amount and a crossing angle as quantified from the operation necessary to correct the edge drop of the strip; and (b) causing the work rolls to move and cross each other with the amount determined in this way of displacement and crossing angle.
12. The method of lamination of a strip according to claim 11, characterized in that the method comprises the steps of: (a) adjusting an objective value of the thickness distribution in the widthwise direction on the exit side of the series mill; (b) predicting a thickness distribution in the widthwise direction on the output side of the control frame relative to the set target value; (c) using the predicted thickness distribution as a target thickness distribution on the output side of the control frame; and 10 (d) causing the work rolls to move and cross each other on the control frame.
13. A method of laminating a strip to continuously laminate a strip in a series laminator comprising a plurality of frames, which is characterized in that it comprises the steps of: the working cylinders that control the displacement each having a tapered end in the axial and transverse direction, controlling the cylinders of 20 top and bottom work in at least two of a plurality of frames; (a) perform a displacement control of the working cylinder and the crossing control of the working cylinder in the frames of the front side between the two 25 or more frames to be subjected to displacement control and crossover control, based on a thickness distribution detected in the upstream stream of the front side frames; and (b) perform control of the displacement of the working cylinder and control of the crossing of the working cylinder in front side frames between two or more frames that are to be subjected to the displacement control and the crossing control, on the basis of a thickness distribution detected downwards of the rear side frames.
14. A laminator of a strip, in which at least one pair of working cylinders has a tapered end, provided with a displacement mechanism, which causes the tapered cylinder to move in the axial direction and a crossing mechanism, the which causes the cylinder to rotate through a certain angle within the plane parallel to the lamination plane, to achieve mutual crossing, which is characterized in that it comprises control means, which: (a) determine an amount of displacement and an angle of crossing as the amount of operation necessary to correct the edge fall of the strip; and (b) sending the determined amount of displacement and crossing angle to the displacement mechanism and the crossing mechanism, to cause the work rolls to move by the amount of displacement and to cross each other by the crossing angle.
15. The laminator according to claim 14, characterized in that the laminator is operated by the steps of: ^ --- ^ (a) calculating a correction amount of the edge drop 10, necessary to correct the amount of falling edge at a target value; and (b) determining a displacement amount and a crossing angle necessary to correct the amount of edge fall of the strip based on the ratio of: 15 (I) an amount of displacement, (II) a crossing angle, and (III) a correction amount of the edge drop in relation to (I) and (II).
16. The laminator according to claim 14, characterized in that the laminator is operated by the steps of providing a reference position in a position separated from the edge of the sheet by a certain distance; calculate a quantity, separation 25 between the cylinders necessary to achieve a desired improvement of the edge drop on the basis of the relationship between the gap between the cylinders, between the upper and lower working cylinders with the reference position as a reference, by one side and the amount of correction 5 of the edge drop, on the other side.
17. The laminator according to claim 14, characterized in that the laminator is operated by the steps of: (a) determining an amount of correction of the edge drop needed to correct the amount of the edge drop of a strip in a target value, based on the previously determined relationship between the crossing angle and the ratio of the correction amount of the edge drop 15 with the amount of change in the separation between the cylinders; and (b) determining a displacement amount and a crossing angle necessary to correct the edge drop the strip based on the ratio of the amount of displacement, 20 the ratio of the correction amount of the edge drop to the amount of change in the gap between the rolls, the ratio of the amount of correction of the edge drop to it and the ratio of the cross angle and the ratio of the amount of correction of the edge drop with the amount of change in the separation between the cylinders.
18. The laminator of a strip according to any one of claims i4 to 17, characterized in that at least two points for controlling the amount of edge drop are provided on one side in the widthwise direction and an improvement in the drop of edge is achieved in the control points of the edge drop.
19. The laminator of a strip according to any of claims 14 to 17 ', characterized in that the measuring means for measuring the thickness profile to calculate a correction amount of the edge drop. 15 necessary to correct the edge drop is adjusted on the output side of the laminator.
20. A series mill comprises a plurality of frames, wherein at least one frame except 20 for a final one is a control frame, characterized in that it comprises: (a) a movement mechanism, which causes at least one set of working cylinders from a pair of work cylinders each having one end 25 tapered to move in the axial direction and a crossing mechanism, which causes the cylinders to cross each other in the horizontal plane; and (b) a control means which determines a displacement amount and a crossing angle as 5 quantifies the operation necessary to correct the edge fall of the strip, and (c) send the thus determined amount of 'Me displacement and crossing angle to the displacement mechanism and the crossing mechanism to cause the 10 working cylinders they move by the amount of displacement and to cause the work cylinders to cross each other at a crossing angle.
21. The series rolling mill according to claim 20, characterized in that the control frame located closest to the output side of the series rolling mill causes the working rolls to move and cross each other by the steps of: (a) adjusting an objective value of distribution of thickness in the widthwise direction on the exit side of the series mill; predicting a thickness distribution in the widthwise direction on the output side of the control frame in relation to the target value established in this way; and (b) using the predicted thickness distribution as a target thickness distribution on the output side of the control frame.
22. A series mill that allows thickness control in the width direction of a strip, provided in a plurality of frames each having mechanisms to cause a pair of work rolls to have a tapered end for displacement at 10 the axial direction and crossing each other within the horizontal plane, characterized in that the plurality of frames are provided with control means in which: (a) determining an amount of displacement and a crossing angle as quantified from the necessary operation 15 to correct the falling edge of the strip; and (b) sending the amount determined in this manner of displacement and crossing angle to the displacement mechanism and to the crossover mechanism, respectively, to cause the work cylinders to travel through the 20 amount of displacement and to cross each other by the crossing angle; and further: (c) means for detecting a thickness distribution in the widthwise direction before lamination; (d) means for detecting a thickness distribution in the widthwise direction after lamination; (e) means for crossing / moving control of the cylinders of the front side frames on the basis of a thickness profile derived from the thickness distribution detected prior to rolling; and (f) means for controlling the crossing / displacement of the cylinders of the rear side frames on the basis of a thickness profile derived from the thickness distribution detected after the rolling.
23. The series laminator that allows the thickness control in the width direction of a strip according to claim 20 or 22, characterized in that the laminator is provided with: (a) means for detecting the thickness distribution in the direction of the width arranged downwards of the series mill, on the upstream side of the mill in series and immediately downwards of the frame having the movement mechanism and the crossing mechanism; Y (b) means for controlling the amount of displacement and the crossing angle based on the result of the detection by the thickness detection means in the widthwise direction.
Applications Claiming Priority (10)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP189116 | 1986-08-11 | ||
| JP8-189,116 | 1996-07-18 | ||
| JP8-189,115 | 1996-07-18 | ||
| JP189115 | 1996-07-18 | ||
| JP018876 | 1997-01-31 | ||
| JP9-018,876 | 1997-01-31 | ||
| JP033508 | 1997-02-18 | ||
| JP9-033,508 | 1997-02-18 | ||
| JP035198 | 1997-02-19 | ||
| JP9-035,198 | 1997-02-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| MXPA97005422A true MXPA97005422A (en) | 1999-05-31 |
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