DE2253524A1 - COMBINED THICKNESS CONTROL AND CURVING AUTOMATIC CONTROL FOR A ROLLING MILL OR ROLLING STAND SYSTEM AND PROCESS - Google Patents

Description

PATENT Attorneys FW HEMMERICH GERD MÜLLER D.GROSSE ²²

- bra -

I5.IO.I972

- E 1 ¥ ean-United Inc., Pittsburgh, Penna./USA

Combined thickness control and crown control

automatic for a rolling mill or rolling stand.

System and procedure.

The subject of this invention is a system and a method for controlling and regulating the rolling thickness and the crowning of a Workpiece that is currently in a rolling stand or in a rolling mill, preferably in a four-high stand or a four-high rolling mill is rolled. The rolling mill or rolling stand includes a power transmission unit designed as a piston-cylinder construction for setting the amount formed between the work rolls and roll gap under rolling pressure. A roll bending device also belongs to the rolling mill or roll stand, wherein the bending forces to change the effective roll crowning at the roll gap by the action or transmission of the bending forces is changed to the extended journals of the back-up rollers. The control system includes an automatic control and regulation system, which is constructed and laid out in such a way that it can be used to control and regulate the power transmission unit and the roll bending device a combined assignment based on the signals generated during the measurements in the rolling mill or in the rolling stand is built and saved. This combination assignment of the signals sets a change in position of the power transmission unit equal to the algebraic sum of the signals generated by a change in the rolling pressure or in the rolling force Roll gap changes, but also due to a change is attributable to the roll bending force. At the same time will the change in roll crown caused by the change in roll bending force is set equal to the Change in the roll crown related to the change in the rolling force or in the rolling pressure. The control system also includes a

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PATENTANWÄLTE FW HEMMERICH ■ GERD MÜLLER ■ D. GROSSE 22 209

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Additional circuit for another embodiment of the combined Thickness control and brightness control.

This invention is thus concerned with an automatic thickness control and Crowning control system for bringing about very more precise settings of the roll gap formed between a pair of rolls of a rolling mill or a roll stand during the rolling of metal strips, sheets or the like Work pieces. This invention is particularly concerned with such a control system that automatically and precisely the Fluid pressure in the rolling force ^ transmission device and in the roll bending device builds, controls and regulates, according to their independent and unique Assignment in a rolling mill or in a rolling stand.

It should already be known that in rolling mills an automatic control system is already used to adjust the nip formed between the work rolls of a rolling stand or rolling mill in order to maintain a constant exit thickness for the strip material or for the sheets that are processed with this rolling stand or rolling stand or to achieve rolling thickness. One of these earlier embodiments of an automatic thickness control or an automatic roll gap control is shown and described together with a roll stand construction in US Pat. No. 3,496.7 * 0 of February 2, 1970. With this thickness control system or roll gap control system, certain rolling mill parameters and roll pressure measurements, which are recorded and measured during the rolling process, provide the information needed to form a basis for determining the required roll gap correction and the necessary readjustment of the rolling force, which is created by the piston-cylinder construction carried out power transmission units

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PATENT LAWYERS F.W. H EM M ER ICH · G E 3D λί 0 L LE fl · ύ '. G R OSSt 22 269

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will. An important feature of this control system is that it is necessary to maintain a uniform exit thickness or a uniform rolling thickness for the product to be rolled Carries out roll gap correction faster and more precisely or in the case of sheet metal after it has passed through a roll stand or a rolling mill understood the dimensions that relate to the ■ The thickness of the workpiece relates to and across the width of the workpiece is measured at various points, for example at the edges, in the middle or at points that are a quarter of the The width of the workpiece.

In hot strip rolling mills and in plate rolling mills is due to the use the automatic thickness control or automatic roll gap control the desired effect in terms of achievement a uniform exit thickness or rolled thickness has been achieved. At the same time, however, there are deviations in the crowning or found in the cross-section of the workpiece, which can be very important in certain circumstances. this applies particularly to the case that on a wide band or on a sheet metal when passing through the rolling mill or the rolling stand a very large reduction in thickness is brought about * The term “workpiece crowning” used in this context or the workpiece cross-section, if any, stands for a difference in thickness in the workpiece that runs along measured across the width of the workpiece will. The appearance of crowning or irregular cross-section in a workpiece that has been rolled is an already well-known characteristic which is caused by the fact that the great rolling forces oiiio distortion cause in the rolls of a rolling mill or a rolling stand,

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PATENT LAWYERS F .W. H E M M E R IC H · G E R D MÜ L L E R · D. G R O SSE 22 2 <> 9

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In addition, if during the rolling process a Adjustment or adjustment of the roll gap is made, including the size or extent of the roll deflection changed The other factors that can influence the crowning or cross-section of a workpiece include: Differences in the width of the workpiece, deviations in the uniform metallurgical composition of the workpiece, Temperature deviations and the constantly changing condition of the rolling mill structure itself. Deviations in crowning or in the cross section of a workpiece, for example a metal band, can arise evenly over the length of the band, but they can also fluctuate and appear as random patterns over the length of the band. Such a band can have a wave-shaped design. In addition, i η Severe cases the tape becomes warped and uneven · However, this condition of unevenness is more related to that Cold strip rolling, where the strip is relatively thin and in the course of rolling is hardened »A strong uneven surface or Cross-sectional design can cause the tape as a second choice it must be declared that it must even be scrapped because it meets the requirements for the intended use not fulfilled.

In order to be able to meet the demands of the industry, is through Numerous methods and devices in the rolling mill system have been improved for the purpose of eliminating the deviations in the crowning or in the Reduce the cross-section of the workpiece during rolling or even avoid it entirely «A process and a device that have proven particularly successful are shown and described in US Pat. No. 3,250,105 issued May 10, 1966, respectively been. This method and apparatus will

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PATENT LAWYERS F.W. HEMMERICH ■ GERD MÜLLER -D. SIZE 22 2Ö9

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treated in the further course of this patent application under the name "support roll deflection. ¹¹ With this method and this apparatus, the support rollers of a Quartowalzgerüstes is transmitted kontouren-regulating bending moment outside the main bearing chocks on the extended roll neck, wherein on these rolls, the bending moment in such a direction and is transmitted in such a size that the deflection of the work rolls at the roll gap is counteracted in a compensating manner. In connection with the use of the backup roll bending device in a rolling mill, an overall change in thickness in the strip or sheet metal to be machined was determined as a concomitant phenomenon the extent of these thickness deviations depends not only on the specific design of the backup roll bending device, but also, including the control system, on the design of the rolling stand or rolling mill.

The previously known attempts to create an automatic control system for bringing about corrective roll gap settings in a roll stand or in a rolling mill and thus for producing a product with a desired thickness and a desired cross section have not been able to achieve the degree of success required by the industry. One embodiment of this control is shown and described in U.S. Patent No. 3.kl6.3kl, issued June 17 to C. Dev et al. This patent deals with a roll stand control for actuating a hydraulic roll bending drive and a roll lifting drive. A special form of roll stand construction is created in which the drives for lifting the rolls counteract the rolling pressure, the rolling force or the rolling load, but at the same time have a parallel.

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force on * certain structural elements of the roll stand construction is transferred, for example to linkage and pressure cell combinations. The purpose of keeping the roll gap constant is to keep the aforementioned parallel force constant be given. The roll bending device includes a liquid drive θ or hydraulic drives that are proportional to the force changes in the roller lifting devices, these too are hydraulic, controlled and regulated. In terms of manufacture of a workpiece with constant thickness and desired crowning or desired cross-section, the control and Regulation of the roll bending forces in a directly proportional assignment the deviations or changes in the forces of the hydraulic roll lifting device, which also includes the roll load, the rolling pressure or the rolling force is considered to be insufficiently precise and accurate.

Another control system known in rolling mills is with U.S. Patent No. 3,339-566, issued July 30, 1968 in the name of J.W. O'Brien has been issued. This control system deals with the compensation of the influence, which a corrective roll deflection exerts on the strip thickness control system. In this control system, the roll benders are included in a control circuit that determines the rolling loads on the roll stand, so that the sagging of the rolls is automatically controlled and regulated in accordance with an increase or decrease in the rolling loads will.

None of these known control and regulation systems recognize it the influences that occur simultaneously with a change in the whale gap or occur when the roll crown changes and influence each other, none of the aforementioned systems tried

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PATENTANWÄLTE F.W. H EM M E R ICH · G E RD MÜ L L E R · D. G R O SSE 22 269

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A ₄ October 15 * 1972

a compensation for the aforementioned influences *

The aim of this invention is therefore mainly the precise one Determination of the mutual influence of the automatic Thickness control and the backup roll bending control in a rolling mill or a roll stand, within the scope of this objective, a control and regulation system is also to be created, with both a precise thickness and a desired cross-section can be achieved in a workpiece.

Another object of this invention is to provide a automatic control and regulation system> for a roll stand or for a rolling mill that is of such a construction. is designed that a thickness correction is made on the basis is that the thickness of a workpiece by the Correction of a crown control device or a cross section control device being affected.

Another object of this invention is to provide a four-high mill stand with a force transmitter designed as a piston-cylinder construction or as a hydraulic cylinder for adjustment of the roll gap between the two work rolls, with piston-cylinder constructions or hydraulic cylinders Roll bending devices and with a control loop for the thickness and the crown or the cross section of which one Signal is generated that de? The roll gap, and this together with the influence of a simultaneous and precise change in the effective roll crowning on the roll gap. This control and regulation system can be used for cases in which if this is desired, the workpiece can be produced without crowning.

Yet another object of this invention is to provide a control and regulation signal, which is used as the basis for a

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PATENT LAWYERS F .W. H E M M E R IC H · G E R D Vl U L L F R ■ D. G R O SSE 22 209

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corrective thickness control also a crown correction includes, in an antomatic control and Control system for a roll stand with rolling force transmission elements for thickness control and power transmission elements for the deflection of the back-up rolls within the scope of the crown control "

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PATENT LAWYERS F.W. HEMMER [CH · GERD MÜLLER · D.GROSSE 22 2Ö9

- bra -

10/15/1972

3 -Gl-

This invention will now be described below with reference to the drawing illustrated embodiment (the embodiments shown in the drawing) explained in more detail · The drawing shows int-

Fig. 1 A section through a four-o-roll stand that in

the construction is carried out in such a way that the use of the control and regulation system of this Invention is possible.

2 shows a block diagram of a specific roll stand component assigned control and regulation system, the aforementioned specific components being reproduced in a plan view of the roll stand according to FIG are"

The sheet metal four-high mill stand shown in FIG. 1 is constructed in its preferred embodiment in such a way that it can carry out the essential functional features of this invention. In each of the two roll stands 11 and 12 of this roll stand a stand window 13 is incorporated, which accommodates the upper work roll I ^ with the bearing chocks 15 seated on the bearing journals "The upper work roll Ik is supported by a back-up roll, an upper back-up roll 18, the bearing chocks 19 of which are also inserted in the stand window." The lower work roll 16 is supported by a back-up roll, a lower back-up roll 21, with a large diameter, the bearing chocks 22 are also arranged in the upright windows. At the top of the roll stand there is a crosshead or a carrier 23 which is guided through the two upright windows in such a way that it engages in the back-up roll mounting piece 19.

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Each roll stand has an adjusting spindle 2k with which the carrier or the crosshead 23 can be adjusted or adjusted together with the upper support roll 18 and the upper work roll 16 with regard to the lower work roll 16. This roll adjustment is carried out in a conventional manner using an adjusting spindle drive (not shown here), the adjusting spindle drive being operatively connected to the adjusting spindles 2k in such a way that it rotates the adjusting spindles with respect to a guide nut which is arranged in a recess in the roll stand so that it cannot rotate be moved. In each of the aforementioned recesses, a pressure cell 26 is arranged between the nut 25 and the roll stand, the task of which will be explained in more detail below. Compensating devices, not shown, are connected to the levers 27 in such a way that by them the carrier or the head 23 is brought into engagement with the lower ends of the adjusting spindles or the adjusting spindles 2k. The outward, on each side of the roll stand, guided parts 23a of the carrier or crosshead 23a each hold a cylinder with a piston 29, which form a piston-cylinder construction intended for roll bending or a roll-bending drive cylinder 30 which over the lines 31 are supplied with the pressurized hydraulic fluid. The forces generated by the drive cylinder 30, ie by the piston-cylinder construction 30, are transmitted via the piston 29, the pressure cells 32 to the yokes 33, the downwardly directed arms 33a of which are positively connected to the outer bearing chocks 3 * 1, which sit on the elongated roll neck 18a of the upper backup roll. The carrier 23 and its outwardly protruding parts 23a equal the roll bending forces that of

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PATENTANWÄLTE FW HEMMERICH · GERD MÜLLER -D. SIZE 22 269 ^:

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the drive cylinders or the piston-cylinder structures 30, in a way that is independent of the roll stands and the Aristell spindle constructions

As far as the lower part of the roll stand is concerned, a long beam 35 is arranged in the upright windows in such a way that ■ the 'overlying layer of built-in pieces 22 touch the carrier, - nsn, while under the carrier the cylinder 36 with the piston

37 are arranged «These are collectively called piston-cylinder constructions or referred to as power transmission drive cylinder 38. Any of the foregoing constructions

38 is arranged in the lower part of the stand window, namely such that pressurized hydraulic fluid accordingly According to the design features of this invention, the drive cylinders 38 are supplied via lines 39. On each Side of the roll stand are the parts 35a of the carrier 35 guided outside and hold the pressure cells 4l there. In contact with the pressure cells 4l there is one to the cylinder 43 belonging piston 42, both of which drive cylinder 44 for forming the roll bend, which is the pressurized hydraulic fluid each received via a line 45 is supplied. The force generated by each roll bending cylinder 44 is from a yoke 46, to which the upwardly directed and with the outer bearing chocks 47 on the elongated roll neck 21a of the lower support roller 21 frictionally connected arms 46a belong, transferred. The carrier 35 together with its protruding parts 35a resembles that of the roll bending cylinders or * of the piston-cylinder constructions intended for roll bending 44 generated roll bending forces in a manner that is completely different from the roll stands and drive cylinders 38 is independent

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PATENT LAWYERS F .W. H E M M E R ICH · G E R D MÜL L E R ■ D. G R O SSE 22 269

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As can be seen from FIG. 1 and FIG. 2, attention is paid pulled onto the lower part of the roll stand in which the two housing projections 48 are arranged so that they approach each other in the stand window, each of the aforementioned Projections 48 form a recess from which a pressure meiidose 49 is held. Under each of the pressure measuring cells or pressure cells 49, a carrier spring 51 is arranged in such a way that that in accordance with the description in U.S. Patent No. 3.490.743 the spring between those belonging to the carrier 35 Bars or extensions 35 and the pressure cell 49 pressed together will,

Fig. 2 shows a control circuit having the features of this invention or a control and regulating system having the features of this invention, in which, according to the illustration, the electrical signals generated by the aforementioned pressure cells come from the pressure cells on the control panel of the rolling mill or rolling stand It should be clear that with regard to the drive side of the rolling mill or rolling stand, either a second and identical control system is provided, or that, as an alternative, the control and regulation system to be described takes over the control and regulation of the entire rolling mill or rolling stand, with the various Signals of the corresponding pressure cells which are assigned to the two roller stands, an average value is formed by means of an additional control circuit already known in this field. The signal generated by the pressure measuring device 20 is proportional to the total rolling pressure P present between the work rolls during the process. The pressure measuring cell 49 generates a Signal.Q which is the difference between the force odor load K generated by the Ko'lben-Zy 1 Indor

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PATENT LAWYERS F.W. HEMMERICH GERD MÜLLER D. GROSSE 22 2Ö9

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Construction or the cylinder 38 is generated, and the rolling load or the rolling pressure P is proportional. In the particular roll stand construction shown with Fig.l, the signal Q is used in a proportional manner as a scale or a size for the distance between the lower part of the roll stand window and
the webs or projections 35b of the carrier 35 are used. Other position transducers known to those skilled in the art, for example the "LVDT ¹ s", "LVCT's" and the like, can be used for

A A Q

Generation of the signal αλ h, which corresponds to the value —— ' equivalent to

is to find use. This will be the further loss of this
Patent application to be described and explained in detail. The pressure cells 32 and kl generate a signal B that
the roll bending force exerted on the outer bearing chocks seated on the extended roll necks of the support rolls 18 and 21
is transmitted is proportional.

The signal P generated by the pressure cell 26 is via a
Line 58 led to an amplifier 59, but the same
also in a memory circuit 6l, which is used to generate a signal Po, this signal Pb standing for the rolling pressure or the rolling load between the work rolls at the time the workpiece enters the roll gap.
The signal Po is used as a "locking" roll pressure reference signal. A potentiometer 62 generates a signal Ρ ™haben, das
corresponds to a roller pressure specification signal which can be selected by setting the aforementioned potentiometer 62.
The potentiometer 62 is led via the line 63 to one of the contacts of the manually operated switch 6k . The signal Po is applied to the other contact of this switch 6k via the line 65
fed. From the switch 6k, which is shown in its normal operating position or Schaltpoaition, the signal Po is in the

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Line 66 performed when animal while switch is in the switching position gostrichelt reproduced, the signal Ppiiu is switched to the line 66, which in turn connects to the amplifier 59 and to an amplifier 67 produces.

In the amplifier 59, the signals P and, depending on the respective switch position of the switch 6l, the signals Po or P are combined to form a signal Δ P, since "the change in the rolling load generated between the work rolls or the roll pressure generated between the work rolls is due to one Amplifier 68, the signal P is combined with a signal M _{/ p} , which is generated by a potentiometer 69, and then represents in a proportional manner the module of the construction elements belonging to the roll stand, whereby the module is in a MatAstab and a size for the A change in the rolling gap caused by a change in the rolling boiastuiig or the rolling pressure is “The signal. M, we <l conducted via a line to the Vet.stuicor 64 whose Ausfiajiii in line 71 "in proportion to the Siitiial Cactuar

Ap · · ■

- is and the change ties Arboi tawal zntispn I tns as a function

Wp

corresponds to a change in the WalzboLastun # or in the Walzdnu'k «

Δ ρ

The signal · ·· is transmitted via the Leituit |; 7 uinoiii Vevstiirkor JH

G / P switches to ^ and there with a Si.'jnhl from the module control 7'i » which is known per se in the professional world, combined.

Λ u

The signal ■ '- ■ _t ( _{aa WO} g _er i, i _er

Ci '' P control 73 oine niinkkopplitn ^ or * wine iiückführuup · can have, an amplifier 7 ^ and there with the other compories

■■■■■ * \ ■ ':

ten-Steuerunffssignale zuaaminen ^ efaüt "to be generated in an orphan described below"_;

The signal Q of the DruckmeUdoae h ^{ j is switched via oine Lottun / ΐ 7 "> aiii 'an amplifier 76, but also to one

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PATENT LAWYERS F.W. H EM M E RICH · <3 ER D MÜ LLER · D. G R O SSE 22 269

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Signal storage circuit 77 * The output signal Qo of the memory circuit 77 stands for the size of the pressure measuring cell signal Q at the time the workpiece enters the roll gap and is used as a "locking" pressure measuring cell reference force Q. The signal Qo switched to the amplifier 79 and combined there with a signal from the line 8o which has been generated by an acceleration and deceleration signal program circuit 81. This signal program circuit 81 is designed in such a way that it introduces a compensation factor into the open-loop and closed-loop control system if abnormal operating conditions have to be compensated for by acceleration or deceleration during a deviation from the preselected rolling speed is switched via a line 82 to the amplifier J6 , from which a signal can then be taken that is proportional to A Q, but also proportional to the display in the pressure cell Q <This signal ^ Q is switched to an amplifier 84 and there with a Combined signal M, which is applied via a line 85 from a potentiometer 86 from the amplifier 8k , the aforementioned potentiometer 86 being designed in such a way that after manual adjustment it generates a signal proportional to the module of the spring 51 · The output of the amplifier 8k is a corresponding to the equation = 4h Calculating signal which is proportional to the change in the distance between the support projections or support webs 35 and the bottom of the stud window, which is identified by the general reference number 13a. This change in distance includes every movement that can occur between the piston 37 and the cylinder 36

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The signals generated by the pressure measuring cells 32 and kl are combined to form a signal B from ammenge This signal B stands for the external bending force transmitted to the extended roll journals of the support rolls. This signal B is switched via a line 87 to an amplifier 88, but also to a memory circuit 89. The output signal Bo generated in a line 90 of the memory circuit 89 corresponds to the magnitude of the external bending force for the point in time when the workpiece enters the roll gap comes in. This signal is thus used as a "locking" bending force reference signal. The line 90 is connected to one of the contacts of a manually operated switch 91 with two switch positions. _{A further contact belongs to the switch 91 and receives a signal B n} -,;, switched on from a manually set potentiometer 93 via a line 92. During normal rolling operations

JrJKl! /

the signal corresponding to the value Bo is forwarded from the switch 91 via a line 9 ^, which can also be seen from the switching position of the switch 91. However, if the switch is switched to the switching position shown in dashed lines, then the line 9 ^ carries the signal B, the value of which has been selected according to a predetermined roller bending force, via the line 9 ^ the signal is carried to an amplifier 95, where it is transmitted by a signal M_, i "is divided, which has been taken over a line 96 by a potentiometer 97. This signal M_ / _ is set and selected manually in such a way that it corresponds to the module of the rolls Ik _t 16, 18 and 21 belonging to the roll stand, but also to the structural elements of the roll stand assigned to these rolls. This module is a measure of the change in the effective crown of the work rolls due to a change in the on

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PATENTANWÄLTE FW HEMMERICH GERD MÜLLER D. GROSSE 22 ² (> 9

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the roll bending force acting on the extended roll journals of the backup rolls. The amplifier 95 receives a value

c / b

corresponding signal generated and via a line 98 'to the Amplifiers 100 and 99 switched. The amplifier 100 combines the signal with the connected from amplifier 88

° / ^B Λ B
th signal —— what has the consequence that on the line

^{C / B} away

101 a signal proportional to the value of the variable

^M C / B
is generated, which is the change in the crown of the rolls as

A change in the rolling load or the rolling pressure results in

■ - AB ' speaks. The signal —- rj - is transmitted via line 101 to the

G / Β amplifier 102 led. The same signal is also given one of the contacts of the switch having two switching positions 1Q3, which is shown in its normal operating position, switched on;

In accordance with the essential features of this invention becomes the signal - 'that has been previously described

is compared with a signal that is expressed as a quantity ■ ■?; - ■ loading

^M C / P

is drawn and corresponds to the change in the roll crown in the roll stand, which occurs simultaneously or in combination with a

Δ p

Change in rolling force arises. The signal - rz —- * is there-

^M c / P

generated by that a manually adjustable potentiometer 10 * 1 is set in such a way that it generates a signal M / that for the module of the work rolls, the back-up rolls and the structural elements of the rolling stand assigned to these rolls stands. This module is a scale or a size for those due to a change or deviation in the rolling mill

P · <

load or change or deviation in the effective crowning of the work rolls arising in the rolling pressure «The aforementioned signal M _ß / _p is applied to an amplifier I06 via a line 105 and is combined there with a signal P from line 58,

PATENT LAWYERS F .W. H E M M E R ICH · G E R D MÜ L L E R · D. G R O SSE 22 269

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in such a way that on line 107 «in output signal is produced. Now amplifier 67 combines these

^M C / P
Signal M_ / _p with the signal from line 66 and generated depending on the switching division of switch 6k in line 108

Pn P PWTf

a signal ■ - or - * ■. The line 108 leads

to an amplifier 109, which in turn in the line

Ap

device 110 generates an output signal that is sent to the

^M C / P
ker 102 is switched on, but this is also fed to the second contact of switch 103?

Γ Λ ρ - Ab

V ^p c / b

This signal is then sent to one of the contacts of a two switching

112
position having switch performed in its, normal. With the switch 112 in this switch position, the signal in the line is used to control the servo valve or control valve 114 in accordance with the following mathematical formula.

t "1> · ■■ 0, ^M C / P ^M C / B ^J

whereby again in accordance with the aforementioned formula a precise fluid pressure is built up in the hydraulic lines 31 and 45 by a pump, not shown, which a · Change in the bending force transmitted to the backup rolls caused so that the effective crowning of the rollers is corrected in an exact manner so that at the same time with the Thickness correction to be described in detail in the workpiece dl sets the desired crowning or the desired cross-section.

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PATENTANWÄLTE FW HEM M ER ICH · G 1 = R β M Ü LL ⁵ =. ' ⁰ · 2. G RC SSE 22 209

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In order to bring about a "receiving relationship" between the "locking" signal B, ie. between the reference signal B _o , and the "locking" signal P _Qf, ie the reference signal P _Q , these are indicated in FIG.

Bo

C / BJM _{r / t)} MT

This is achieved in that the holder 112 in the dashed line reproduced switching position is brought, which leads to that the line 113 is connected to a line 115 which the following output signal leads: -

this signal being switched on by an amplifier II6. The signals which are fed to the amplifier Ho are the output signal I ■ ^| - - ^| I that

⁰ L, M _c / _p ^M c / b ^ from the amplifier 99 via the line 17, as well as the output signal (C + C + ^C f? / _D ) 9 ^da »via the line 119 from an amplifier 118 is switched off «The ± output signal of the amplifier 99 is created by combining the signal e ■■ ¹ from the amplifier 67 with the signal °

^M C / P ^M C / B

from the amplifier 95 »taking this signal in the previously

Po

described way have been formed «At the signal

^M C / P

it is a locking initial reference signal that for the effective roll crown due to the rolling load or

the roller pressure is. In contrast, the signal is

^M C / B

an initial locking reference signal corresponding to the effective roll crown due to the roll bending force generated by the piston-cylinder structures 30 and hk. The signals for

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the size (C + C_ + C rp _{/ τ} Λ are the output signal of the Verm ι n./u

amplifier 118, which controls the potentiometers 121, 122 and 123 The generated signals are summarized and combined · The potentiometer 121 is set by hand in such a way that it corresponds to the value C ..

The potentiometer 122 is set by hand in such a way that it corresponds to the value C _{T of} the thermal crowning of the rolls of the rolling stand, the aforementioned thermal crowning as a function of the rolling process, but in particular as a function of the Roller heating, is introduced. The potentiometer 123 is finally set in such a way that it corresponds to the value C fl> y of the desired crowning or the desired cross-section in the sheet after it has passed through the rolling process.

An important aspect of this invention is an improved thickness control system, which is functionally able to counteract the influences of a simultaneous corrective brightness control to detect and compensate for the thickness of the sheet to be rolled in the rolling mill or rolling stand. In order to be able to achieve this, one heard to the control and regulation system reproduced with FIG. 2 an amplifier 125, the module signal M / in line 96 divided by a module signal M / ", which is from a potentiometer 127 is switched on via a line 126. This The signal generated by the manually adjustable potentiometer 127 represents the module of the back-up rolls, the arboits rolls and certain other structural elements of the roll stand, with the module is a measure or measure of the roll gap change due to a change in the roll bending force. From amplifier 12 5

a factor - proportional

^M G / B signal generated. In the amplifier 129 this signal is with a

over the line I30 and the switch 103 supplied signal

0 9 8 2 0/0 B fi8

PATENT LAWYERS F.W. H EM M E R IC-H G E R D M O LLE R D. G RQSSE 22. 209

- bh I5.IO.I972

94 ' - α 13 -

multiplied. In the preferred mode of operation, the line receives

Δ B
130 the signal - locked while after switching

^M C / B
of the switch 103 in the switching position shown in dashed lines

the signal -I Γ | on this line switched

L ^M C / P ^J L ^M G / B ^J will. In the preferred mode of operation, the amplifier has 129

Δ B
an output of —— that is proportional to the change

in the roll gap due to a change in, the roll bending force.

Δ B
This signal ■ ■ is transmitted to the amplifier via line I3I

^M G / B
ker 132, which is also from the amplifier & h

Δ Q
off receives the aforementioned signal ■ · - switched to. That from

s · Δ Q amplifier I32 generated output signal, which has the value —rr— ⁴

Λ B

^M G / B

corresponds to, via a line 133 to the already

previously described amplifier 7 ^ out and there in such a way

A. P
the signal - combined that the line 13 ^ a

G / P '

Control valve or a servo valve 135 supplied control signal can be expressed mathematically with the following formula: -

Λ β ν

^M G / P s "g / B

The control valve 135 controls and regulates the from a pump not shown here in the line 39 to the power transmission unit, which is designed as a piston-cylinder construction or as a hydraulic valve 38.

Now that the construction elements and their assignment in Control and regulation system according to FIG. 2 has been described are to be considered below in connection with the functioning this control system, the theoretical basis using a Bleohwalzgerüstee or Blochwaljswerkes are described, with this Blochwalzgorüst or sheet rolling mill only dor Bosch friction has been chosen because of, Γη agreement with the respective

PATENT LAWYERS F.W. HEMMERICH · GERD MÜLLER ■ D. GROSSE 22 269

- bh 15.10.1972

- G Lk -

The switching position of the switches 6k, 91, 103 and 112 can control and regulate the control system described above or the control system described above for controlling and regulating the plate rolling stand or the plate rolling mill in any of the various operating modes described above. The exit thickness or the rolling thickness of the sheet leaving the roll stand can thus be expressed mathematically as a function of the forces that interact during the rolling process with the following equation or formula:

* \ (Equation 1).

G / P s G / B In this equation or formula:

h = unloaded roll gap between the work rolls · P = rolling load or rolling pressure.

M / = module of the roll stand construction elements. This Module is a measure or quantity for the change in the roll gap due to a change in the rolling load or in roller printing.

Q = load or force acting on the carrier spring of the position transducer acts.

M = module of the carrier spring belonging to the position transducer.

B = backup roll bending force.

M / = ModuL of the work rolls, the backup rolls and the the constructions assigned to the WaLzoii 1 emontu des WaLzfjerüs tes. This module is a benchmark or υ Liio size for changing the roll gap i »ufgruml a change in the IJLegerkraft for the S does zwal zoii.

As -Viiadtunk for dio Aus trl t tsclLeko odor die WuLzdiuke des

<:.) 0 'J »π / ο ;; G 3

PATENT LAWYERS F.W. H EMM E R ICH · G ER D M O LLE R · D. G ROSSE 22 209

- bh. October 15, 1972

93 - G 15 -

The rolling mill or the rolling stand, the assignment is described, that when P becomes larger, the roll gap opens, with the result that so does the exit thickness or roll thickness of the material becomes larger, that when Q increases, the roll gap decreases, and when B increases, the roll gap decreases as well scaled down.

Now it is possible to write for the actual crowning or the actual cross-section of a sheet after rolling - for this crowning and this cross-section the formula symbol CjT / has been chosen, where the crowning of the sheet - that is, the size Cf £ / κ ~ by the The amount by which the sheet is thicker in the middle than at the edges or edges is determined. The following applies: -

(Equation 2). In this equation or formula is / are:

^C fL / Δ " ^actual crowning in the sheet.

• P, B = sizes that already emerged from the aforementioned

Equation or formula are known.

M _c / p = module of the work rolls, the backup rolls and the associated roll stand construction elements. This module is a measure or a quantity for UXm change in the effective crowning of the work rolls as a result of a change in the rolling load or in the rolling pressure

Mß / g = modulus of the work rolls, the backup rolls and the associated roll stand construction elements. This module is a yardstick or a

309 8 20/066

PATENT LAWYERS F .W. H E M M E R ICH · G E R D MÜ L L E R · D. G R O SSE 22 269

- bh 15.10.1972

- σ 16 -

Change of the effective crowning of the work- » as a result of a change in the backup roll bending force.

C _x . β Effective mechanical crowning of the work M

rolling.

C_ ss Effective imported into the work rolls thermal crowning.

According to equation or formula 2, there are those listed below Assignments and dependencies: - If the rolling pressure P increases, the rollers also bend more, which in turn leads to ge has that the resulting crowning in the sheet is greater. But if the back-up roll forces are increased, then the crowning in the sheet becomes less; the greater the mechanical crowning caused by grinding on the rolls and / or the crowning brought about by the thermal effect in the rolls, the resulting crowning or the resulting Cross-section in the rolled sheet is reduced.

Now, with each passage of a sheet through the roll stand or the rolling mill, the value h given by the setting of the adjusting spindles 2k does not change, and there are also no significant changes in the values for the mechanical crowning and the thermal crowning of the rolls. Should the inlet thickness, the hardness, the temperatures and the like deviate more from the normal value in the sheet metal, then this necessarily also leads to a change in the rolling pressure, whereupon the Q-forces and the B-forces, the continue to also change P, be changed in such a way that the values t ₂ and C / remain constant.

These changes are given numerically in that the

309820/0668

PATENT LAWYERS F.W. HEMMERICH GERD MÜLLER D. GROSSE 22 269

- bh 15.10.1972

$ - GI ₇ -

the differentials or deviations from equations 1 and 2, taking the math below. Equations or formulas result in: -

* 2

A P 6th Q Δ B.

(Equation

H
O a O A. ⁰ M. = 0 Δ ⁰ T = 0

(Equation h) .

_{Because the variables h, C ", C T} do not change during an action of the control and regulation system * required during the uniform thickness control and crowning control, the mathematical assignments can be written down as follows: -

(Equation 5). (Equation 6). (Equation 7).

Because the automatic control and regulation system _{should keep the exit thickness t 2} constant at a predetermined value, we: ^ / _Q after rolling, it follows from this that these ΰ * νβ η must not deviate from a given value, which can be written as follows: -

t ₂ β 0. (Equation 8).

Cfl / A "0 (equation 9)"

If equation 5 and equation S are introduced into di® equation 3 ©, then the following reordering of the quantities is ale zuotandeglei chun «for dl · constant thickness« de «

30982 0/068

PATENTANWÄLTE F.W. H E M M E R IC H ■ G E R D MÜL L E R ■ D. G R O SSE 22 2Ö9

- bh I5.IO.I972

- G 18 -

ΔΖ ( ₊ -A ^) = O (equation 10).

^M G / P * 0 / B

By introducing equations 6, 7 and 9 into equation k , a “reordering of the sizes is achieved for the state equation for the uniform and constant crowning required for sheet metal or for the uniform and constant cross section required for sheet metal. The equation of state for this is thus: -

= 0 (equation II).

^m c / b

Equations 10 and 11 therefore determine the assignments of the changes in force that must be observed simultaneously during the rolling process. To produce a sheet of high quality, i.e. a sheet of constant thickness and constant crowning or constant cross-section from end to end, including the possibility of a crowning of NuIl ₁ , the mutual dependencies or the interactions between the changes in P, Q and B , which are specified as changes in force Λ Ρ »> ÄQ and / ^ B, are adhered to by a fast and precise, continuous control.

Xn Equation 10 and Equation 11 each of the terms for a change in force or, to be more precise, for a change in force divided by the module factor · For this reason, according to Hook's law, the substance of these equations equivalently expressed as dimensional changes. So it can be written for equation 10

ν 0 ('Equation 12).

In this formula or equation:

309820/0668

PATENTANWÄLTE F.W. H EM M E R ICH · G E R D M Cl LLE R · D. LARGE 22 209

- bh - 15.10.1972

- G 19 - '

Q = change in the roll gap due to a change in the rolling load or in the whale pressure.

G = change in the roll gap due to a positive

Change in the piston -% - linder construction or designed as a hydraulic cylinder power transmission element.

G_ = change in whale cavity due to a change in the roll bending force "

In relation to the equation 11, the equation given below can be written

! J -> ° (Equation- 13).

In this equation:

C_ s change in the effective crowning of the work rolls due to a change in the rolling load or in Waizdruck «,

A π = change in the effective crowning of the work rolls due to a change in the roll bending force ·

Does that work with Pig. 2 on the basis of equations 10 and 11, the rolling pressure also increases when a sheet with a greater initial thickness enters the roll gap. This in turn has the consequence that the elongation of the roll stand or the roll stand is greater, that the deflection of the support rolls is greater, which in turn means that after rolling, the sheet has a greater thickness and a greater crown. This is counteracted immediately in the roll stand in that the deflection 'of the support springs 51 is made smaller, with the pressure measuring

309820/0668

PATENTANWÄLTE- F .W. H E M M E R IC H · G E R D MÜ L L E R · D. G R O SSE 22 269

- bra -

10/15/1972

- G 20 -

dose k9 a smaller force Q is measured. As a result of this immediate action of the control circuit or the control circuit, oil is simultaneously fed to the power transmission cylinders 38 and the cylinders 30 and kk of the backup roll bending device in order to bring about a gain in the forces of the Q pressure load cell and the forces in the B pressure load cell, which in turn leads to this that the force in the pressure cell is also greater. The resulting larger forces Δ P _f Δ Q and ^ B are controlled and regulated in such a way that equations 10 and 11 are fulfilled at the same time. This is in Pig. 2 each marked with the lines J3 ^ and 113.

The combined thickness control and crown control for a rolling mill or for a rolling stand can also be explained in more detail using the following example. For this purpose it is assumed that the work rolls belonging to the roll stand construction for a sheet metal rolling mill according to FIG. 1 have a diameter of k2 " , the backup rolls have a diameter of 80" and this with a roll barrel length of 190 " Sheet a thickness reduction are made, then the individual modules of this roll stand have the following values: -

^M C / B = 302 χ 10 lbs / in. ^M C / P = 391 x io ⁶ lbs / in. ^M G / P = 31.2x 10 ⁶ lbs / in. ^M G / B = U1.2X 10 ⁶ lbs / in. M.
S. = 1.6 χ 10 ⁶ lbs / in.

11

If a sheet with a thickness of 1.370 and a width of 100 "is to be reduced to a thickness of 1" by rolling, then it can be assumed that the locking reference rolling force P or the locking reference rolling pressure P has a value of

309820/0668

PATENT LAWYERS F.W. HEMMERICH GERD MÜLLER D.GROSSE 22 209

- bh 15.10.1972

- G 21 -

Has 7,000,000 lbs. Under these rolling conditions are over the width of the sheet the different ones listed below Crowning given-

Mechanical crowning G _M = 0.00195 "
Thermal crowning 0 _χ = 0.01551 ".

The crowning due to the roll deflection under the rolling load or under the rolling pressure as per the following calculate the equation as follows: -

= 0.01793 "(loss of crown).

But this is for the desired crowning of the sheet or for the desired cross-section of the sheet of CtP / "= 0.000" a rollback beer force of 144,000 lbs is required to to be able to achieve a backup roll deflection of O.00047 "according to the formula given below.

- ^ -.

O / B 302 χ 10 lbs / in,,

A balanced or balanced crowning state can be obtained using the equation below t B

. C / B

After inserting the numerical values, the following applies:

0.00047 "= Co, 01793" - (0.00195 "+ 0.01551" + 0.000 ") j O.00047» = 0.00047 » _#

Now it is assumed that a sheet with a greater thickness of 1 _? 48ΐ "enters so that asu rolled out at the plate on the previously mentioned required exit thickness or Waladioke can, now a rolling pressure or · Wml" b * la "processing of P a 8,050,000 lba & rf is orderlich what

309820/0 66 8

PATENT LAWYERS F.W. H EM M E R ICH G E R O M O L LE R O. G ROSSE 22 269

- bra »15.10.1972 30 - G 22 -

corresponds to an AP of 1,050,000 lbs. According to the Aus. guides of this invention, by an increased Walzenbie-, gekraft AB of a "held 811,000 lbs according to equation 11, the crown or the cross section of the sheet automatically constant A β L ρ

^M C / B ^M C / P

because

811,000 lbs 1,050,000 Ib =

302 χ 10 lbs / in 391 χ 10 lbs / in

O, OO268 "- 0.00268" 3 0.00000 "
is.

But that means the convexity of the sheet metal required from the start of 0.00000 "is adhered to. Equilateral is in accordance with this invention an exact thickness correction accordingly Equation 10 below is carried out!

A ρ / Λ q . Δ β _v _

^M G / P β ^M G / B

from which it follows that the power transmission system is automatic so that Q = 23,000 lbs as shown in FIGS The following two equations can be recognized-

1,050,000 lba 23,000 lbs 811,000 lbs 8888

31.2 by 10 lba / in. 1.6 10 lbs / in. . 4l _# 2 χ 10 lba / in

■ 0.00000 "or

0.03362 "- (0.0142O ¹¹ ♦ 0.01942") a 0 * 0000 ",

waa means that the sheet metal whale thickness of 1.0000 "required from the beginning" is adhered to «

It is also important to emphasize that in the given example of the sheet metal scaffolding a or the sheet metal rolling mills, only the diok correction for the power transmission system is due to the other 58 $ from the 3tUtswalz.nbiegeeyat.nl

309820/0668

PATENT LAWYERS F.W. HEMMERICH GERD MÖLLER D. GROSSE 22,209

- bra -

I5.IO.I972

- G 23 -

at the same time keeping the crowning or the cross-section constant of the sheet.

In a control method which differs from the control method described above, the influence of a change in the bending force A B on the thickness of the sheet is anticipated in that a second Λ P signal is applied directly to the amplifier 129. This signal is given by the equation - . related to the signal Δ B, where-

c / p c / b

in this relationship or assignment through the simultaneous operation of the servo valve or control valve ILk in creating a constant crown or a constant cross-section, w4.rd. The A P signal supplied by the amplifier 128 from the amplifier .137 then has the form of a 1 Γ HN ^{when the} switch 103 is in

G
-1 Γ —HN

Ji L ^m g / b J

^M c / p Ji L ^m g / b

the switching position shown in dashed lines is located. This

Δ B
Signal is equivalent to the value;, '.

^M G / B

Whale engineering professionals can now see that the basic mathematical formulas given by equations 1 and 2 are rewritten can be, with the addition of additional and / or other forces that are in a roll stand structure build up. For this purpose, a roll stand construction without the reaction carrier extensions 23a and 35a is an example taken according to Fig «1, this extension in the there The example shown shows the reaction forces of the roll bending forces have to include. Furthermore, in the example of the roll stand construction without reaction carrier extensions as described in US Pat. No. 3,375,589 arranged directly between the roll neck extensions of the backup rolls be. In accordance with this invention, they read Basic equations then:

309 8 2 0/0688

PATENT LAWYERS F .W. H E M M E R ICH ■ G E R D M O L LE R ·. O G ROSSE 22 269

- bh 15.10.1972

32 - G 2h -

t "= η + · +

² ° ^M G / P ^M s ^M G / H

(Equation Ik)

for the exit thickness of the roll stand, where the rolling force, the rolling load or the rolling pressure P according to the equation P = F-Q-B is determined. The crown or cross-section of the sheet after rolling can be determined by the following quoted equation must be recorded "

FQB B ,

M - - ( ^{0 +} S)

C / Ρ

(Equation 15)

This invention has been described using the example of a sheet-Quartowalzgerüstes or Quartowalzwerkes, wherein the roll stand i construct on _f with Figure 1 shown having preferred design features that make the essential functional characteristics of this invention possible. Nevertheless, to deviate from the spirit of this invention, any other roll stand construction can also be combined with the control devices described here for rolling rolled strip, sheet metal or male workpieces.

In accordance with the applicable patent regulations and the principle and the function have been illustrated and described using an exemplary embodiment that for the best exemplary embodiment of the subject matter of the invention is held.

309820 / 0G63

Claims (1)

PATENTANWÄLTE F.W. H EM M E R IC H · G E R D MÜ LLER ■ D. G R OSSE 22 209 - bh 15.10.1972 Wean-United Inc., Pittsburgh, Penna./USA Claims 8 1. A method for automatically monitoring and maintaining the exit thickness and the exit crown of a workpiece that is reduced in thickness in a rolling mill or in a rolling stand, whereby due to the non-uniform properties of the workpiece entering the rolling mill or into the rolling stand - for example by a Changes in the inlet thickness, through changes in the metallurgical composition and through changes in the crowning - normally the crowning of the workpiece exiting the rolls changes, but also the thickness, and thereby also causing changes in the elastic deformation or expansion of the roll stand construction. The roll stand construction, in which two work rolls are inserted into the roll stand, include power transmission devices that have to adjust the roll gap between the two aforementioned work rolls under the rolling load or under rolling pressure, and roll bending devices that change the crowning of the work rolls acting on these work rolls have to transmit a roll bending force. The aforementioned method for automatic monitoring and compliance with the exit thickness and the exit crown in a rolled workpiece
characterized in that several signals are generated from the aforementioned non-uniform or non-uniform material properties of the workpiece entering the rollers result, but also from the changes in the aforementioned power transmission device and the changes in the roll bending devices listed; 309 820/0688 ATENTANWALTE F .W. H E M M E R IC H ■ G E R D M Cl L L E R · D. G R O SSE 22 269 - bh 15.10.1972 in a predetermined manner bringing about simultaneous interrelationships between the aforementioned signals, namely in accordance with the influence that these signals have on the exit thickness and the exit crown of a workpiece to have; finally also the actuation, or control and regulation, of the aforementioned power transmission devices and of the aforementioned roll bending devices to prevent a workpiece having a constant thickness and a constant To achieve crowning or with a constant cross-section from the rolling mill or rolling stand. 309820/0688 PATENT LAWYERS F.W. HEMMERICH GERO MÜLLER D.GROSSE 22 269 - bra - 15.10.1972 - ^{A 3} - Method for automatic exercise simple and compliance with the exit thickness and the exit crowning of a Werkatükkes, which in one. Rolling mill or in a rolling stand is reduced in thickness, whereby due to the non-uniform material properties of the workpiece entering the rolling mill or into the rolling stand - for example due to changes in the inlet thickness, changes in the metallurgical composition and changes in the crowning - normally the The crowning and the thickness of the workpiece coming out of the rolls have changed and thereby also cause changes in the elastic deformation or in the elongation of the roll stand construction »Roll stand construction» in which two work rolls are inserted into the roll stand include power transmission devices that are under rolling load or under rolling pressure have to set the roll gap between the two aforementioned two Arfoeitswalzen, also still include roll bending devices that transfer a roll bending force to these work rolls to change the crowning of the work rolls Aben, .The aforementioned method for automatic compliance and for automatic monitoring of the exit thickness and the exit crown in a rolled workpiece
characterized in that the individual steps or individual functions listed below for him belong: Generating a plurality of signal material are some n or from the ungleiehmäi.ttgr> nonuniform result of the entering into the rollers workpiece, but so also au "the changes in the aforementioned Kraftübertragungsvor- 309820/0088 PATENT LAWYERS F .W. H E M M E R ICH ■ G E R D MÜL L E R ■ D. LARGE 22 269 - bh 15.10.1972 - A k - directions and changes in the specified roll bending devices; bringing about simultaneous interrelationships or assignments between the aforementioned in the intended manner Signals, in accordance with the common and simultaneous influence that these signals have on have the exit thickness and the exit crown of a workpiece; Control, or control and regulation, of the aforementioned Power transmission devices and the aforementioned roll bending devices in accordance with the simultaneous Interrelationships and assignments in such a way that that the algebraic sum of the changes in the roll gap due to changes in the rolling load or in the rolling pressure as well as on deviations in the position of the power transmission devices, but also on a change in the aforementioned roll benders, are returned to zero; can also be reduced to zero the changes in the effective roll crown and their algebraic sum based on changes in the rolling load or in the roll pressure as well as changes in the roll bending force. 3. Procedure for automatic monitoring and compliance with the exit thickness and the exit crown of a workpiece, that in a rolling mill or in a rolling stand in dor Thickness is reduced, being due to the non-uniform Materialeifjonschaft des in the rolling mill odor in the Roll stand incoming workstüikoa - for example through Changes in the enema thickness, due to changes in the metallurgical composition, due to changes in the 3 0 i) «? 0/0 G (Ϊ H PATENT LAWYERS F.W. HEMMERICH GERDMÜLLER-D.GROSSE 22 209 - bra - 10/15/1972. -AS- · Crowning - normally the crowning and thickness of the workpiece exiting the rolls can be changed, which in turn changes the elastic deformation or elongation of the roll stand structure. The roll stand construction, in which two work rolls and two backup rolls supporting the above-mentioned work rolls are inserted into the roll stand, include power transmission devices that have to be set under the rolling load or under the rolling pressure between the aforementioned two work rolls, and also belong to the piston-cylinder constructions or Roll bending devices designed as hydraulic cylinders which, in order to change the acting crowning of the work rolls, have to transmit a 'roll bending force to the generation of a roll bending moment' on the extended journals of the back-up rolls rolling workpiece
characterized in that it includes the individual steps or individual functions listed below: Generating multiple signal resulting from the uneven or non-uniform material properties of the workpiece entering the rollers result, but likewise also from the changes in the aforementioned power transmission devices and the changes in the piston-cylinder constructions or hydraulic cylinders Roll Bendersj in a predetermined manner bringing about simultaneous 309820/0668 PATENTANWÄLTE F.W. H EM M E R IC H · G E R D MÜ L L E R · D. G R O SSE 22 209 - bh np October 15, 1972 3 £ _ A 6 - and concurrent interrelationships or assignments. between the aforementioned signals, in accordance with the common and simultaneous influence, which these signals have on the exit thickness and the exit crown of a workpiece; Control, or control and regulation, of the aforementioned Power transmission devices and the aforementioned Roll bending devices designed as a piston-cylinder construction or as a drive cylinder, namely in such a way that that the interrelationships or interrelationships given by the two equations given below be expressed, brought back to zero together and at the same time, i.e. set equal to zero, will. The two equations J- Λ G ₁ . i = »ι and In this formula is: G ^ a change in the roll gap due to a change in the rolling load or in the rolling pressure G = change in the roll gap due to a change in position in the aforementioned power transmission devices. Δ O ~ . ■ » Change in the roll gap due to a change in the roll bending devices. Δ C ₁ μ change in the effective roll crown due to a change in the rolling load or in the whale pressure, Δ C ₂ - change in the wlrksman. ^{Roll crowning} due to 0 9 8 2 0/0668 ^{9lamr 3} ^ "*" * * »*« · wi ,. " _{blwkPaffc #} ATENTANWÄLTE F.W. HEMMERICH GERD MÜLLER D. GROSSE 22 209 - bra - _{ot |} 10/15/1972 i-3 - A 7 - ha Method for automatically monitoring and maintaining the exit thickness and the exit crowning of a workpiece that is reduced in thickness in a rolling mill or in a rolling stand, whereby due to the non-uniform material properties of the workpiece entering the rolling mill or the rolling stand - for example by changes in the inlet thickness, through changes in the metallurgical composition, through changes in the crowning - usually change the crowning and the thickness of the workpiece exiting the rolls, which in turn leads to the fact that the elastic deformation or the elongation of the roll stand construction is changed. The roll stand construction, in which two work rolls and two backup rolls supporting the above-mentioned work rolls are used, include: power transmission devices designed as piston-cylinder construction or hydraulic cylinders, which have to adjust the roll gap between the aforementioned two work rolls under rolling load or under rolling pressure; Position transducer devices for measuring the changes in the aforementioned power transmission devices designed as piston-cylinder designs or hydraulic cylinders, also roll bending devices designed as piston-cylinder designs or hydraulic cylinders, which are used to change the crowning of the work rolls acting on the extended journals Back-up rolls transmit a roll bending force to generate a roll bending moment. The aforementioned method for automatic monitoring and for automatic compliance with the exit thickness and / or the exit crown in the case of a workpiece to be rolled 3 0 9 H 7 0/0 6 6 8 PATENT LAWYERS F.W. HEMMERICH ■ GERD MÜLLER ■ D.GROSSE - bra - ,. I5.IO.I972 HO - A 8 - characterized in that it includes the individual steps or individual functions listed below: Generation of several signals that result from the non-uniform material properties of the workpiece entering the rollers, but also from the changes in the piston-cylinder design or power transmission devices designed as hydraulic cylinders as well as from the changes from the piston-cylinder designs or hydraulic cylinders Whale bending devices; in a given catfish induction of simultaneous and concurrent interrelationships or assignments between the aforementioned signals, in accordance with the common and simultaneous influence, the have the aforementioned signals on the exit thickness and exit crown of a workpiece; Control, or control and regulation, of the aforementioned and as a piston-cylinder construction or as a hydraulic cylinder executed power transmission devices and the Roll bending devices designed as piston and cylinder construction or as hydraulic cylinder in Correspondence with the already mentioned mutual assignment of the aforementioned signals, namely in such a way, that the two equations mentioned below are brought back together and simultaneously to zero or equal Be set to zero _JLE_ (.Au— ₊ ^ ^B \. and 309820/0668 PATENT LAWYERS F.W. HEMMEFLICH GERD MÖLLER D. GROSSE 22 269 - bra - '15 .10.1972. _ _{A 9} " Ap Λ Β ^m " ^m -r ° In these equations © of the formulas s = change in the roll gap B between the work roll g / p '· Zen due to a change in the y / al load or in roller printing «, Δ Q. . M = One of the position sensors or position sensors avoid measured change in position in the aforementioned power transmission devices _{or the like} Δ B s Change in the roll gap between the work rolls g / b 'due to a change in the previously mentioned Roll bending force. A ρ i, as change in the effective crowning of the previous C / P
'imagined work rolls due to a change in the rolling load or in the rolling pressure. Δβ ., = Change in the effective crowning of the aforementioned c / b .. '■ th work rolls due to a change in the ready mentioned roll bending force. Process for automatic monitoring and compliance with the exit thickness and the exit crown of a workpiece, which is reduced in thickness in a rolling mill or in a rolling stand. This method according to claim gekennzeiclinet that the individual steps listed below or Individual functions can be assigned: Control, or control and regulation, of the piston-cylinder construction or Walsembiegevorriclitungen designed as hydraulic cylinders for the moment that the Runs into the Waleepalt ©, and awar after the 3 0 9 8 2 0/0688 ATENTANWALTE F.W. H EMMERICH ■ G E RD MÜ LLER · D. G ROSSE 22 209 - bh - I5.IO.I972 - A 10 - B P rf ⁼ - ^(C M ^{+ C} T ^{+ C} fE / D ⁾ c / b c / p '' In this formula or equation, ι is B.
- = initial crowning, i.e. interlocking reference g / b ¹ crowning in the work rolls due to the Valzen bending force already mentioned. = Effective initial crowning, i.e. locking MC / P de Reference crown in the work rolls due to the rolling load already mentioned or due to the rolling pressure. C .. =. Effective mechanical crowning of the working N rolling. C = -Thermally induced effective crowning in the aforementioned work rolls. C cd / _n = desired crowning / desired cross-section of the workpiece after passing through the thickness reduction in the rolling mill or rolling stand. Method of joint and simultaneous monitoring
and maintaining the exit thickness and the exit crowning of a workpiece that is in a rolling mill or a
Roll stand is processed. The rolling stand, in which two Arbeltswals are used, include power transmission devices that are under the rolling load or under the
Rolling pressure have to adjust the roll gap existing between the two work rolls, as well as a roll bending device that has to transmit a roll bending force to these work rolls in order to change the effective crowning of the work rolls. The aforementioned method
characterized in that 309820/0668 PATENT LAWYERS F.W. HEMMERICH GERD MÜLLER D. GROSSE 22 269 - bra - _fi ~ 15.10.1972 t3 - A 11 - the individual steps listed below or for him Individual functions include: Generation of a first signal, that of a change in the whale gap due to a change in rolling load or rolling pressure; Generation of a second signal indicative of a change in the position of the aforementioned power transmission devices is equivalent to. Generation of a third signal that corresponds to a change in the Roll gap due to a change in roll bending force is equivalent to; Generation of a fourth signal indicating a change in corresponds to the roll crown due to a change in the rolling load or in the rolling pressure; Generation of a fifth S 'signal, which corresponds to a change in the roll crown due to a change in the aforementioned Whale bend force equals; finally also the control, i.e. Control and regulation of the aforementioned power transmission devices and the aforementioned rollersb: * egevorrichtungen that the algebraic sum of the aforementioned first signal, the aforementioned second signal and the aforementioned third signal is returned to zero, while at the same time the algebraic sum of the aforementioned fourth signal and the aforementioned fifth signal to Nully baw »almost to zero, x / whether a workpiece with constant thickness and constant crown or constant cross-section is then produced, _o 7. ' Procedures for joint monitoring and compliance Exit side and the exit crown sin-ss'-workpiece, 309820/0668 PATENT LAWYERS F, W. HEMMERICH ■ GERD MÜLLER · D.GROSSE 22 209 - bra - _flf . 10/17/1972 mm - a 12 - while it is being processed in a rolling mill or in a rolling stand »The rolling stand, in which two Arboitswalzen are inserted, include power transmission devices which, under rolling load or under rolling pressure, have to adjust the roll gap between the two aforementioned work rolls the effective crowning of the work rolls to develop a roll bending force and to transfer it to the work rolls. The aforementioned method for simultaneous monitoring and compliance with the exit thickness and the exit balance of a workpiece, characterized in that it includes the individual steps or individual functions listed below: Generation of a first signal, that of a change in the roll gap due to a change in the rolling load or in Rolling pressure, including the influence the roll bending force already mentioned; Generation of a second signal that corresponds to a change in the position of the aforementioned power transmission devices is equivalent to; Generation of a third signal that corresponds to a change in the roll crown due to a change in the rolling load or in Waizdruck corresponds to; Generation of a fourth signal that corresponds to a change in dor roll crowning due to a change in the aforementioned Roller biopower corresponds to; finally also the control, i.e. control and Regulation of the aforementioned power transmission devices 3 0 9 8 2 0/0668 PATENT LAWYERS F.W. HEM M E R ICH · G E R D M O LL E R · D. G ROSSE 22 269 - bra - _riv ^. 10/15/1972 H ^ - A 13 .- and the aforementioned roll bending devices in such a way that the algebraic sum of the first signal and returned to zero from the second signal, i.e. is set equal to zero, while at the same time the algebraic sum of the third signal and the fourth Signal is returned to zero or substantially to zero or set equal to zero, which in turn has the consequence that the workpiece has a constant thickness and a constant crown or a constant cross-section after rolling having. 8 «Procedure for joint and simultaneous monitoring and compliance with the exit thickness and the exit crown of a workpiece that is processed in a rolling mill or in a rolling stand. To the roll stand, in the two work rolls sn and two the work rolls supporting Back-up rollers are used, include power transmission devices designed as piston-cylinder constructions that, under rolling load or under rolling pressure, the roll gap between the two aforementioned work rolls Roll bending devices designed as piston-cylinder constructions, which to change the effective work roll crown Transfer of a roll bending force to the extended Roll journals of the back-up rolls in the back-up rolls are bending moment have to bring about · The aforementioned® method of joint and equilateral monitoring of the outlet thickness and the exit ball shape of the workpiece characterized in that the individual steps listed below or Single functions include: 309820/0668 PATENT LAWYERS F .W. H E M M E RIC H · G E R D MÜ L L E R · D. LARGE 22 209 - bra - ", October 15, 1972 Hrb - A 14 - Generation of a first signal, that of a change in the roll gap due to a change in the rolling pressure developed in the roll gap or between the aforementioned work rolls or corresponds to the rolling load developed there; Generation of a second Sigrxal, which corresponds to a change in the relative position of the piston with respect to the cylinder of the aforementioned power transmission device is equivalent to; Generation of a third signal, which is a roll gap change due to a change in the beroits listed Roll bending force corresponds to; Generation of a fourth signal, which is a change in the roll crown due to a change in the rolling load or in the rolling pressure corresponds to; Generation of a fifth signal, which is a change in the roll crown due to a change in the aforementioned Roll bending force corresponds to; Finally, also the activation, i.e. control and regulation, of the force transmission device designed as a piston-cylinder construction or all hydraulic cylinders and the cylinder bending devices designed as a piston-and-cylinder construction or as a hydraulic cylinder, in such a way that the algebraic sum from the first signal , from the second signal and from the third signal, but also the algebraic sum from the fourth signal and from the fifth signal, jointly and on the same side returned to zero or almost to zero, i.e. set equal to zero, which in turn results in that after walling the workpiece has a constant thickness and min » ^: <i; u * t« ■ /, «crowning or a constant transverse 309820/0668 'ATENTANWÄLTE F.W. H EM M ER ICH · G E R D MÜ LLE R · D. G ROSSE 22 269 - bra - ^ 15.10.1972 mV - a 15 - has cut. 9. Automatic control and regulation system for simultaneous and precise monitoring and compliance with the exit thickness and exit crowning of a workpiece which is reduced in thickness in a rolling mill or in a rolling stand, whereby due to the uneven or non-uniform material properties of the material in the rolling mill or in change typically the thickness and the crowning of the running out of the rolling stand Werkstükkes what wiederuri resulting _s that the elastic deformation or strain - the roll stand incoming workpiece, for example, by changes in the inlet thickness, by changes in the metallurgical composition and by changes in the crowning the rolling frame construction is changed. The roll stand construction ₉ in which two work rolls are inserted into the roll stand includes power transmission devices that have to adjust the roll gap between the two work rolls under the rolling load or under the rolling pressure, and roll bending devices that change the crowning of the work rolls acting on them Work rolls have to transmit a roll bending force «The aforementioned control and regulation system
characterized in that
belong to him: Devices for generating a large number of signals resulting from the previously mentioned irregular or uneven material properties of the rolls incoming workpiece result, but also from the changes in the power transmission devices 3Q9820 / QG68 PATENT LAWYERS F W. H E M M E R IC H ■ G E R D M Ü I. L E R - D. G R O SSE 22 209 - bh _{f |} ^ 10/15/1972 HY - α i6 - and from the changes in the aforementioned roll bending devices J Devices in accordance with the simultaneous and concurrent interrelationships between the the aforementioned signals, the common influence of these signals on the exit thickness and the exit crowning have to calculate the workpiece; finally also control devices or regulating devices, those of the aforementioned power transmission devices and roll bending devices as actuators are assigned and the simultaneous and concurrent Assignments or interrelationships between the signals have to be observed, so that the workpiece after exiting from the rolling mill or from the rolling stand a constant thickness and a constant crown or a constant Has cross-section. 10, rolling mill or similar plant with a roll stand to accommodate two work rolls, with a roll gap between the two Arboitswalzen, the due to the rolling of the workpiece sicli between The forces developing and building up the rolls are subjected to changes in thickness and changes in roll deflection is. This rolling mill or rolling stand is further characterized in that still belong to him: Power transmission devices that dorart in the roll stand are housed and arranged that they the roll gap can adjust under rolling load and under rolling pressure; Roll bending devices used to change the effective Crowning of the work rolls on these work rolls 309820/0688 PATENTANWÄLTE F.W. H EM M E R ICH · G E R D M O L L E R · D. G R OSSE 22 269 - bh 15.10.1972 - AI ₇ - Transfer roll bending force; a control and regulation system a device for generating a first signal that a roll gap change due to a change in the Rolling load or in rolling pressure corresponds; a position indicator or a position converter Generation of a second signal, which corresponds to a change in position in the aforementioned power transmission devices is equivalent to; a device for generating a third signal that a roll gap change due to a change in the Roll bending force corresponds to; a device for generating a fourth signal, which corresponds to a change in roll crown due to a change in rolling load or rolling pressure; a device for generating a fifth signal, that of a change in the effective roll crown due to a change in the aforementioned roll bending force is equivalent to; a first control and regulating device assigned to the aforementioned power transmission devices, which, as an actuator, has to adhere to a predetermined or predetermined assignment or correlation between the first signal _9, the second signal and the third signal? one of the aforementioned bending device !! associated second control and regulating device _s which, as an actuator, has to maintain a predetermined or pre-determined assignment or correlation between the fourth signal and the fifth signal. ' 11. Roll stand or similar Anlag® mash spoke 10, 309 8 20/0 688 PATENT LAWYERS F .W. H E M M E R IC H · G E R D MÜ L L E R · D. SIZE 22 26 "J - bra .V _1x - 15.10.1972 OV - A 18 - characterized in that the aforementioned power transmission devices as piston-cylinder constructions or as hydraulic cylinders that are driven with hydraulic fluid or hydraulic oil, are executed 12. rolling mill or similar device according to claim 11, thereby ffekennzeichnot, dai.i the aforementioned position indicator or the aforementioned. Position transducer is made up of püigi Druckmoüdose and a spring construction for measuring dos of the aforementioned Krafiunffsvorriclituiif ^ on nodded to Lead Far. Ll. Rolling mill or similar installation according to Claim 12, characterized in that
to this rolling mill or tfalzgorüst furthermore / »ehüron: each with a support roll provided with an extended roll neck for supporting each of the aforementioned two work rolls} The DAU over they can be for Arid · * tion of the effective crown of the work orphans Bieeemomente to the back-up rolls transmitted with the ready anffefUhrten- Walzenbiegevorrictifcun & s are so connected kraftachlüeeitf, finally also on the extended Waisensapfon the Stutswalzen mounted · "uüare bearing installation" tueke _s · Ik, rolling mill or similar plant still claim 13, characterized in that
In the Walag-erüat a carrier element is designed and arranged for each of the supporting rollers in such a way that the above-mentioned rolling forces are in a manner independent of the strength of the force 309820 / 066Θ PATENT LAWYERS F.W. HEMMERICH ■ GERD MÖLLER · D. GROSSE 22 209 ■ - foh October 15, 1972 - A 19 - to be brought into balance 15. Rolling mill or similar plant according to claim 14, characterized in that this rolling mill or rolling stand also includes a device which incorporates the aforementioned first signal, the aforementioned second signal and the aforementioned third signal in accordance with the equation given below. other combined and summarized, This equation reads: Δ ρ ₍ Aq Δ β ·.
^m g / p " ^M s Vb wherein the aforementioned first control and regulation device as an actuator returns the equation to zero, i.e. equals zero In this formula or in this equation Δ P chung, the first signal stands for ■ ■ ■ ■ ₉ the second signal Δ Q " ^G / ^P Λ B for ^{1 1} and the aforementioned third signal for ^M s ^M G / B In this formula or equation: Δ P = change in the rolling load or in the rolling pressure « M / = s module for the roll stand construction elements. This module is a measure or a quantity for the change in the roll gap due to a change in the rolling load or in the rolling pressure, Aq = change in the position indicator or on the load acting on the position transducer, M = spring module for the aforementioned position indicator s or position transducer belonging spring. Δ B = change in, the roll bending force. M / = module of the work rolls and the support rolls as well as of the construction elements assigned to these rolls, This module is a size for the roll gap Change due to a change in the roll bending force " 309820/0683 PATENT LAWYERS F .W. H E M M E R IC H ■ G E R D M O L L E R · D. G R O SSE 22 209 - bra - 10/15/1972 - A 20 - l6. Rolling mill or similar installation according to claim 15, characterized in that this rolling mill or rolling stand also includes a device which generates the aforementioned fourth signal and the aforementioned fifth signal in accordance with the one below given equation summarized and combined. This equation or formula is: Δ ρ _ Δ β ^M C / P " ^M C / B wherein the already mentioned second open-loop and closed-loop control device has the aforementioned equation as an actuator Returns zero, i.e. equals zero. In the aforementioned Δ P For the fourth formula, the fourth signal stands for while the fifth signal for -r ~ - represents. ^M G / B Furthermore, in the above equation: M / = module for the work rolls and the backup rolls as well the structural elements assigned to these rollers. This module is oin scale or oine Quantity for the change in the effective crown of the work rolls due to a change in the Roll load or in roll pressure. My = module for the Arboitswalzon and din support roller!) as well as for the construction elements assigned to these waltzes. This module is oiii Malistab or oino GröMo i'for the effective «· crowning dor A rh t» ii η rolls due to aiideiinir. in diu (<> texts orw.ihnt on Walzenbiogokral t. 17. Walawerk odor similaro plant »according to Ansprm Ii Ui ₉ dadujc h konzoi chnt-t that
zu liipsora rolling mill odor Walzgoi'üst oiiit "Vnrri" ht ung itir 309820/0668 PATENT LAWYERS F .W. H EM M E R ICH · G E R D MÜ L L E R · D. LARGE 22 269 - bra - 10/15/1972 -A21- Generation of a sixth signal belongs, which corresponds to the effective initial crowning - ie a locking reference crowning - of the work rolls due to the aforementioned roll bending force, in accordance with the equation mentioned below. Is that formula or equation?
BP B = signal for the initial bending force, as a reference signal » P = signal for the initial variable load, as a reference signal. C _M = effective mechanical crowning of the work rolls. C ^ = effective caused by thermal effects Crowning of the Arboits rolls. = Desired crowning for the workpiece after rolling in the roll stand or for the workpiece afterwards desired cross-section for rolling « Finally, in addition to the rolling stand or rolling mill, there is also one Switching device belongs to the aforementioned sixth Signal during the moment in which the memorized piece is just entering the rolling mill to the one already mentioned second control and regulating device as an actuator switches. 18. Rolling mill or similar plant with a roll stand to accommodate two work rolls, with a roll gap between the two work rolls, due to the rolling of the workpiece between the orphans developing and building power © Dicken « Changes and roll deflections are generally subject to change let. Bieeee Walaswerk or roll stand 30982 0/0668 PATENT LAWYERS F .W. H E M M E R ICH ■ G E R D MÜL L E R ■ D. G R O SSE 22 209 - bll - October 15, 1972 £> V - A 22 - characterized in that
continue to belong to him: Power transmission devices used to adjust the Roll gap are arranged under rolling load or under rolling pressure in the roll stand; Roll bending devices used to change the effective Crowning of the work rolls oine on these work rolls Transfer roller biopower; a control and regulation system with, a device for generating a first signal that a roll gap change due to a change in corresponds to the rolling load or in the rolling pressure, including the influence of the roll bending force; a position indicator or position converter for generation a second signal which corresponds to a change in position in the aforementioned power transmission devices ; a device for generating a third signal that is due to a change in the effective crowning a change in the rolling load or in the rolling pressure is equivalent to; a device for generating a fourth signal which corresponds to a change in the effective roll crown due to a change in the aforementioned roll bending forces is equivalent to; one of the aforementioned power transmission devices associated first control and regulation device, dl · a predetermined or predetermined one as an actuator Assignment "or correlation between the aforementioned «Step and ar." »± t» listen to signals and obey; 309820/0668 PATENT LAWYERS F.W. HEMMERICH GERD MÜLLER D.GROSSE 22 209 - bra - October 15, 1972 r - a 23 - a second associated with the roll bending devices Control and regulation device acting as an actuator a predetermined or predetermined assignment or correlation between the fourth and fifth signals establishes and complies with " 19. Rolling mill or similar plant according to claim 18, characterized in that furthermore a device for the rolling mill or rolling stand which includes the aforementioned first and second in accordance with the equation given below Signals combined or summarized · This equation reads χ AP ^ Px M _{0 / b} ^ j Q j VbxM _{c / p} 'J% J ' wherein the already mentioned first control and regulating device returns the aforementioned equation to zero or sets it equal to zero. In this equation represents the first signal for Γ 4 P ^M C / P ^ i Δ Q whereas the second signal stands for ——— ^a . In the Δ Q This formula or equation is furthermore: - b> P = change in the rolling bolt pressure or in the rolling pressure. M / = module of the rolling element is the construction element · this Module is a measure or size for changing the roll gap due to a change in the rolling load or in the rolling pressure M / = module of the rollers and dor don rollers assigned Construction elements of the roll stand. This module is a measure or a quantity for a change in the roll gap due to a change in dor already 309820/0668 2 2 5 3 5 2 PAt [NlANWALTf f.W. HtMMlRICH GtRD MÜLLER U. G ROSSf 22 269 - bra - 15.10. - ^{Λ 2h} mentioned Walzon bending force. V ¹ / n ⁼ ^ ^oc * ^{ul of} the rollers and dor assigned to the rollers on Construction loraento of the roll stand * Diosor module is a measure odor oine size i'iir The change in the effective crowning of the work rolls due to a change in the WaJzonbiegekrafton " M /
C / P = module of the rollers and that assigned to the rollers Construction elements of the roll stand. Diesel module is a benchmark odor a greetings for change in the effective crowning of the work walζon a change in the Wa1zboJasiung or in the Walzdmck. Δ Q = One of the posi t ionsmoiiumforitier gtnnesseno Langen; nide- change or position distortion in the force exaggerated gungsvori'i clit utigon. 20. Rolling mill or älinlicho AnI ago nacli Anspi'ucli 19, marked by the fact that furthermore to the rolling mill or rolling stand oine V'orri (lit ung, which the previously mentioned third on and viorton signal «· in accordance with the next ohotid has to combine and summarize two equations. IHo Glei- ohang Jautot: Λ ρ A. u ^M C / P ' ^M C / D where the already angoiühito two disturbance utid H <; g «» luiigf * · device as the final control element brings the preamble «» twoito CtI «i <back to zero or sums it to zero. In dlesor (Hoi- Δ i The third signal stands for - -r. , while Au c / p fourth signal stands for rr-. In this equation A. u / B • udaoii) B a change in whale flexing forces. - End - 30982 0/0668 Blank page