US3777526A - Roller gap control - Google Patents

Roller gap control Download PDF

Info

Publication number
US3777526A
US3777526A US00235250A US3777526DA US3777526A US 3777526 A US3777526 A US 3777526A US 00235250 A US00235250 A US 00235250A US 3777526D A US3777526D A US 3777526DA US 3777526 A US3777526 A US 3777526A
Authority
US
United States
Prior art keywords
roller
sections
pertaining
journaling
housing means
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00235250A
Other languages
English (en)
Inventor
P Fink
L Niemeyer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fried Krupp AG
Original Assignee
Fried Krupp AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fried Krupp AG filed Critical Fried Krupp AG
Application granted granted Critical
Publication of US3777526A publication Critical patent/US3777526A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/10—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring roll-gap, e.g. pass indicators

Definitions

  • the present invention relates to an arrangement of the primary elements for the control of the roller gap, especially of four high or multiroller rolling mill stands, according to which on each side of the stand and on both roller pivots of the working rollers associated with each other there is provided a transmitter or pickup housing.
  • the primary elements are arranged between the roller pivots, which means that on each side of the stand in the plane passing throughthe roller there is located a primary element. Only roller stands with a certain minimum roller diameter can be equipped with such an arrangement. This is due to the fact that the primary elements require a predetermined structural height. When the difference in diameter of the roller barrel and of the roller pivot of the working rollers is less than this mini-- mum height, the primary elements cannot be mounted, while the difference in diameter in its turn is dependent on the size of the roller diameter.
  • FIG. 1 is a transverse section through a four high roller rolling mill stand according to the invention, said section being taken along the line I I of FIG. la.
  • FIG. la is a longitudinal section through the rolling mill stand of FIG. 1, said section being taken along the line Ia--Ia of FIG. 1'.
  • FIG. 1b diagrammatically illustrates a six high rolling mill stand.
  • FIG. is a diagrammatic representation of a multiroller rolling mill stand according to the invention.
  • FIGS. 2 and 3 illustrate a portion of FIGS. 1 and 1a, but on a larger scale than the latter, and in particular, FIG. 2 is a side view of a transmitter or pickup housing according to the invention, while FIG. 3 is a cross section through the housing of FIG. 2.
  • FIG. 4 is a section taken along the line IV IV of FIG. 3.
  • FIG. 5 diagrammatically illustrates centering means between the upper and lower transmitter housing sections.
  • FIG. 6 shows by way of example a block diagram of a gap-control system for use in connection with a hydraulically controlled strip rolling mill according to the invention.
  • FIG. 7 illustrates a schematic diagram for an inductive transducer system for use in connection with the present invention.
  • FIG. 8 shows the mechanical construction of the transducer system of FIG. 7, said construction being identical for reference and feed back transducers.
  • the upper part of the transmitter or pickup housing is in a play-free manner mounted on the roller pivot of the upper roller, whereas the lower. part of the transmitter or pickup housing is in a play-free manner mounted or journalled on the roller pivot of the lower roller.
  • the upper as well as the lower part of the transmitter housing is provided with a holding arm which, when seen in rolling direction, protrudes forwardly and with a holding arm, which with regard to the rolling direction, protrudes rearwardly. Between each two holding arms associated with each other there is provided one primary element each.
  • the two-sectional design of the transmitter or pickup and thearrangement on both sides of the plane through the roller centers on each side of the stand permits a structural height of the primary elements which is practically independent of the distance between the roller pivots.
  • These primary elements are in a manner known perse designed for a direct, for instance, inductive contact-free stroke measurement for ascertaining the distance between the rollers or the roller gap.
  • the primary elements are connected to the remaining part of the control device, i.e., the stage for comparing the rated value with the actual value, in such a way that the mean value of "the two primary elements of one side of the stand represents the actual value of this side.
  • the two bearings for the transmitter or pickup housing are divided horizontally so that the outer bearing cup at the dividing gap which in the direction of rotation of the pivot is located in front is linked to the transmitter or pickup housing and at the rearward dividing gap is braced to the transmitter or pickup housing under spring load.
  • the two parts of the transmitter or pickup housing For obtaining maximum measuring precision of the two primary elements, it is recommended to keep the two parts of the transmitter or pickup housing always in one transverse plane with regard to the axial direction of the rollers.
  • there are between the upper part and the lower part of the transmitter housing provided centering means, for instance in the form of two webs, which are connected to the: upper part or lower part and are displaceable relative to each other.
  • centering means permit a radial displacement of the two parts relative to each other but prevent a relative movement in axial direction of the rollers and in the rolling direction.
  • FIGS. 1 and 1a illustrate a four high rolling mill stand comprising a pair of working rollers 3, 4 which together define the rolling bite B and during a rolling operation rest against an upper supporting roller 1 and a lower supporting roller 2 respectively.
  • the central portion of FIG. 1 is more clearly and on a larger scale than in FIG. 1 shown in FIGS. 2 and 3.
  • FIG. 1a respectively arranged on the roller pivots 6 of the working rollers 3 and 4, and more specifically between the roller barrels 7 and the supporting members therefor, there is arranged a transmitter or pickup housing 8, 9.
  • This transmitter or pickup housing comprising an upper part 8 and a lower part 9. From the parts 8 and 9 and respectively connected thereto protrude holding arms 10 and 11 extending in the rolling direction. Between these arms 10 and 11 there are installed divided primary elements.
  • the upper parts 12 of the primary elements are in the upper part 8 of the transmitter or pickup housing arranged in a self-arresting manner bymeans of screws 17, nuts 18 and loading springs 19.
  • the lower parts 13 of the primary elements are fastened in the lower part 9 of the transmitter or pickup housing.
  • the outwardly located bearing box 14 of the two parts 8 and 9 of the transmitter or pickup housing is connected to the transmitter housing on one side (FIGS. 3 and 4) by means of a pivotable bearing 15 and on the other side by means of a spring biased screw bolt 16.
  • FIGS. Ib and 1c are basically the same as in FIGS. 1 and la with the exception that FIG. 1b shows a six high rolling mill stand, and FIG. 10 shows a multi-roller (l0) rolling mill stand.
  • FIG. 5 shows a further development according to the invention according to which between the upper housing part 8 and the lower housing part 9 there is provided a centering arrangement in the form of two webs 20, 21 respectively connected to said upper part 8 and lower part 9 and displaceable relative to each other which permit a radial displacement of the two parts relative to'each other while a relative movement in the axial direction of the rollers 3 and 4 and in the rolling direction is prevented.
  • FIG. 6 shows a block diagram of a gap control system as it may be used in connection with-the present invention.
  • the vertical working roller distance is measured directly as close as possible to the roll gap by a noncontact position transducer 22, in other words, the delivery gage of rolled metal is measured indirectly without deadtime.
  • the relationship between the delivery gage and the workroll gap is given by a factor that is essentially a function of strip width and roll pressure.
  • Hydraulic pushup cylinders adjust the roll and act like an infinitely rigid roll stand to compensate for any elastic vertical deflection due to roll pressure variations.
  • the speed response of the hydraulic system is large determined by the capacity of the hydraulic pump P and the servovalves per unit of time.
  • the necessary design considerations should include: gage deviations of ingoing metal; maximum frequency of deviation; rate of change of deviation; desired finished gage; required gage tolerances.
  • the absence of contact protects the position transducer against damage by axial thermal expansion of the rolls, and at the same time facilitates roll changes.
  • inductive, electromagnetic and optical position transducers, and distancemeasurement devices The choice should depend on the roll coolant, the working temperature and, eventually, on vibrations in the roll stand.
  • the feedback signal from the transducer should have a precise and stable zero point, high resolution, and repeatability (0.001 mm).
  • the transducer time constants should be small (I to 2 millisec), and there should be absolute linearity between the feedback and the reference.
  • the mechanical design must be such that after each roll change it is possible to establish automatically a zero position by moving the rolls together (when the roll assembly with transducer is inserted in the mill stand, no adjustment by hand can be made). Also, it should be possible to set and monitor the reference roll gap from a remote control station.
  • the time constant of the control system must be adjustable over a wide range in order to obtain optimum matching to all parts of the closed loop.
  • the control cabinet must be provided with input terminals for correction signals that have to be added.
  • the roll gap measurement system described here does not pick up changes in work roll flattening if roll pressure changes occur during rolling. Therefore, under certain circumstances, the roll gap reference value has to be corrected by prepared signals from load cells installed in the mill stand. Furthermore, long-term deviations sensed with a conventional X-ray gage meter (changes in thermal roll-crown, for example) can be integrated over a period of time and then used for correcting the reference.
  • the power output of the control unit must be sufficient to actuate several electrohydraulic servovalves mounted in parallel.
  • the control unit should allow closed-loop servo response in the system to be independent of the roll gap magnitude.
  • the overall design of the hydraulic system should be such that any roll gap deviation can be compensated within a few milliseconds. To keep the time constant of the control circuit low, several small servo-valves in parallel are used.
  • FIG. 7 illustrates the sensing principle and the schematic diagram of an inductive transducer system for use in connection with the present invention.
  • Sensing variable inductance I feed back signal generator
  • variable reference inductance S adjustable reference signal generator
  • All four inductances have the same electrical values and the same geometry
  • the circuit comprises an alternator G, a rectifier D in proper phase, a regulator R, an output element St (in the roll stand), a filter F and a servo-potentiometer P turning in the same direction as the reference signal generator S.
  • FIG. 8 shows the mechanical construction of the sensing system, which is identical for both reference and feedback. Combining two halves of the bridge system (I and I in one transducer assembly makes the system immune to the large variations in coil resistance R caused by temperature changes. If the temperature changes more than 50 C during one pass, which is possible in hot mills, an additional temperature compensation may be effected by thermistors inserted in series with the coil windings.
  • the symmetrical arrangement and the electromagnetic shielding of the transducer assembly reduce variations in inductanceand ensure that the relationship between air gap and control signal is not disturbed by any extraneous effected of electromagnetic interference.
  • the frequency of generator voltage supplied for the bridge system is chosen so as to give a difference in relation between inductance and coil resistance. This transducer system is not affected by the roll cooland used by cold rolling industries. Also, because of its low alternating current inductance, it is suitable for rolling ferromagnetic materials.
  • An arrangement of primary elements for controlling roller gap, especially of four high and multi-roller systems which includes: roller stand means, a pair of working rollers associated with each other and each including a roller pivot, two transmitter housing means respectively arranged on said roller pivots and respec-.
  • each of said housing means having an upper section and a lower section, each of said working rollers having a roller barrel, a pair of assembly members respectively having said roller pivots journaled therein, first journaling means for journaling the upper section of each housing means in a substantially play-free manner on the roller pivot of the pertaining upper roller between the pertaining assembly member and the pertaining roller barrel, and second journaling means for journaling the lower section of each housing means in a sbustantially play-free manner on the roller pivot of the pertaining lower roller between the pertaining assembly member and the pertaining roller barrel, each of said two sections being provided with two holding arms respectively extending forwardly and rearwardly with regard to said rollers when viewing the rolling direction thereof, a first primary element arranged between the two forwardly extending arms of said sections, and a second primary element arranged between the two rearwardly extending arms of said two sections.
  • each of said first and second journaling means are split so as to form a substantially horizontal gap each, and in which each of said first and second journaling means includes an outer bearing cup, each of said outer bearing cups having its front portions when viewing in the direction of rotation of said roller pivots linked to the respective adjacent transmitter housing means and having its rear portion against spring thrust connected to the rear portion of the respective adjacent transmitter housing means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Control Of Metal Rolling (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)
US00235250A 1971-03-17 1972-03-16 Roller gap control Expired - Lifetime US3777526A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2112981A DE2112981B2 (de) 1971-03-17 1971-03-17 Walzspaltmessung an Walzgerüsten Änm: Fried. Krupp GmbH, 4300 Essen

Publications (1)

Publication Number Publication Date
US3777526A true US3777526A (en) 1973-12-11

Family

ID=5801897

Family Applications (1)

Application Number Title Priority Date Filing Date
US00235250A Expired - Lifetime US3777526A (en) 1971-03-17 1972-03-16 Roller gap control

Country Status (11)

Country Link
US (1) US3777526A (xx)
JP (1) JPS5440505B1 (xx)
BE (1) BE780783A (xx)
CH (1) CH534549A (xx)
DE (1) DE2112981B2 (xx)
FR (1) FR2130181B1 (xx)
GB (1) GB1369882A (xx)
IT (1) IT950065B (xx)
LU (1) LU64961A1 (xx)
NL (1) NL7202958A (xx)
SE (1) SE366925B (xx)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4044580A (en) * 1975-07-02 1977-08-30 Marotta Scientific Controls, Inc. Rolling mill gap sensor
US11986872B2 (en) 2019-11-08 2024-05-21 Primetals Technologies, Limited Method of controlling a roll gap in a rolling mill

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3358485A (en) * 1965-02-15 1967-12-19 United States Steel Corp Measuring and controlling gap between rolls
US3662576A (en) * 1969-06-21 1972-05-16 Ver Flugtechnische Werke Control for roll gap of a rolling mill

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1102947A (fr) * 1953-06-15 1955-10-27 Procédé et dispositifs pour mesurer ou contrôler l'écartement des cylindres de laminoirs
CH489287A (de) * 1969-07-14 1970-04-30 Alich Guenther Anordnung zur Messung und Regelung der Achsenverlagerung von Walzen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3358485A (en) * 1965-02-15 1967-12-19 United States Steel Corp Measuring and controlling gap between rolls
US3662576A (en) * 1969-06-21 1972-05-16 Ver Flugtechnische Werke Control for roll gap of a rolling mill

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4044580A (en) * 1975-07-02 1977-08-30 Marotta Scientific Controls, Inc. Rolling mill gap sensor
US11986872B2 (en) 2019-11-08 2024-05-21 Primetals Technologies, Limited Method of controlling a roll gap in a rolling mill

Also Published As

Publication number Publication date
CH534549A (de) 1973-03-15
NL7202958A (xx) 1972-09-19
FR2130181B1 (xx) 1977-12-30
GB1369882A (en) 1974-10-09
JPS5440505B1 (xx) 1979-12-04
DE2112981A1 (de) 1972-09-21
DE2112981B2 (de) 1974-10-31
SE366925B (xx) 1974-05-13
FR2130181A1 (xx) 1972-11-03
IT950065B (it) 1973-06-20
BE780783A (fr) 1972-07-17
LU64961A1 (xx) 1972-07-10

Similar Documents

Publication Publication Date Title
US5533371A (en) Measurement device for roll gap control and process for its operation
US3358485A (en) Measuring and controlling gap between rolls
US4651547A (en) Process for adjusting the thickness and profile of a flat product in the course of rolling
US4481800A (en) Cold rolling mill for metal strip
US3124982A (en) Rolling mill and control system
US4480452A (en) Rolling mill
US3543549A (en) Rolling mill control for compensating for the eccentricity of the rolls
US3247697A (en) Strip rolling mill
US3570288A (en) Rolling-mill assembly with improved control system
US4127997A (en) Rolling mill stand
US4044580A (en) Rolling mill gap sensor
CN112605133A (zh) 轧制板带厚度检测装置及控制系统
GB1391029A (en) Arrangement for measuring the gap of a pair of rolls for a roll stand
US3714805A (en) Control system and method for concurrent automatic gage and crown control of a rolling mill
US3516273A (en) Strip thickness measuring device for use in a rolling mill and like apparatus
US3938360A (en) Shape control method and system for a rolling mill
US3777526A (en) Roller gap control
US2352953A (en) Strain gauge
US2342374A (en) Strain gauge for rolling mills and the like
US4505158A (en) Thermal compensating gage
US3353385A (en) Roll gap measuring device
US3128630A (en) Measurement and control of thickness in the production of sheet and strip material
US3517531A (en) Rolling mill gage control actuator system
US4470297A (en) Camber-monitoring tensiometer
US3733875A (en) Work roll sensing and/or balancing arrangements