US3222900A - Speed control for rocking mill stands - Google Patents

Speed control for rocking mill stands Download PDF

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Publication number
US3222900A
US3222900A US191561A US19156162A US3222900A US 3222900 A US3222900 A US 3222900A US 191561 A US191561 A US 191561A US 19156162 A US19156162 A US 19156162A US 3222900 A US3222900 A US 3222900A
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Prior art keywords
rolling
mills
mill
tensile force
housing
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Expired - Lifetime
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US191561A
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English (en)
Inventor
Helsing Erik
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ABB Norden Holding AB
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ASEA AB
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/48—Tension control; Compression control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/48—Tension control; Compression control
    • B21B37/52—Tension control; Compression control by drive motor control
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
    • H02P5/46—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors for speed regulation of two or more dynamo-electric motors in relation to one another
    • H02P5/50—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors for speed regulation of two or more dynamo-electric motors in relation to one another by comparing electrical values representing the speeds

Definitions

  • the present invention relates to a regulating system for continuous tooling lines, such as wire or tape rolling mills, comprising at least two rolling stands.
  • a normal requirement with such devices is either to avoid tension in the passing material or to maintain a certain predetermined tension or tensile force between some or all the rolling stands. This is necessary if the passage of the Wire (tape, etc.) between the rolling stands is to be stable since it may otherwise easily skid at the high rolling speeds often used in modern rolling mills.
  • a certain variation in temperature relation, cross sectional area of the rolling goods, hardness, etc. also occurs, thus causing a certain variation in reduction relations in a rolling gap and therefore a tension regulation must be arranged which at the greatest variation in one direction does not cause slack wire or tape between the rolling stands and their roller pairs and at the'greatest variation in the other direction does not cause too great tension.
  • the most usual arrangement in continuous rolling mills for rolling wire, tapes, etc. when it is desired to avoid tensile forces in the rolling goods is an arrangement using so-called loop-regulation in some form, i.e. the material follows a crooked path between the rolling stands and the loop position deviations are measured in some way. Via some suitable conversion means this measured magnitude may influence the revolution rate of the motors of the roller pairs lying before or after. Particularly at said high rolling speeds (30 m./s. starting speed and higher in for example wire rolling mills) difficulties eventually arise with the crooked path between adjacent roller pairs.
  • the invention relates to a regulating system of the above mentioned type for continuous tooling lines for solving the above mentioned problems, and is characterised in that measuring devices are arranged to measure the tensile force between two adjacent rolling stands, the output signals of the measuring devices being arranged to be fed directly or indirectly to driving means to the diiferent roller pairs with the intention of regulating the tension in the rolled goods in relation to a desired adjustable value, for example, zero.
  • a desired adjustable value for example, zero.
  • the tensile force is sensed in one or both directions in some or all the rolling stands, for example in connection with the rolling stands being tilted around a certain point.
  • One type of sensing for such a purpose may be a rockable or movable rolling housing with rollers, which housing, during its movement, contacts measuring means of 3,222.5 061 Patented Dec. 14, 1965 any well-known kind, which means measure the pressure from the housing and thus the tensile force built up in the goods being rolled.
  • Such sensing means are shown in the Patent to Norton, No. 2,650,495.
  • Pressure sensing means sense the position of the housing and generates a signal.
  • the attachment between the rolling stand and the supporting base is resilient to avoid friction, and the pressure sensing means arranged on both sides of the rolling stand supports are formed so that they simultaneously act as installation support to limit the swinging movement of the rolling stand.
  • FIGURE 1 shows a continuous tooling line for wire rolling, comprising five rolling stands with respective roller pairs.
  • FIGURE 2 shows an alternative connection for the driving motor regulation and FIGURE 3 a supplementation of the systems of FIG- URES 1 and 2.
  • An arbitrary roller pair in a tooling line is chosen (here for wire rolling) as base, here the rolling stand 3 (FIGURE 1) with respective roller pair 32, and the driving motor 33 for this roller pair follows a reference magnitude 600 common for the whole construction, corresponding to the production speed, suitably adjustable via a potentiometer 6000.
  • a reference magnitude is given, suitable for the revolution rates of the driving means 13, 23, 43, 53, for the different roller pairs, so that between the roller pairs a somewhat greater tension is obtained than that for which the regulating means for tensile force (see below) is adjusted.
  • certain desired tensile forces are adjusted between the rolling stands and the force in the sensing means 11, 21, 31, 41, 51 of the rolling stand (which may be of the type mentioned above and schematically shown in the accompanying figures). Alterations in the tensile force may be sensed on one or both sides and a signal proportional to the sensed tensile force (single or double sided) is arranged to be emitted from the schematically shown members 11, 21, 31, 51. As mentioned the roller pair 32 in the rolling stand 3 is here chosen as base.
  • the revolution rate of the base roller pair 32 is sensed by means of a tachometer-generator 34, the output signal of which is fed to the input side of a current feeding member 35 for the driving motor 33, which member may consist of a direct current generator or a converter, and the output signal from 34 is suitably fed together with the reference signal 600 to a magnetization circuit or control circuit within the generator or converter respectively.
  • the tensile force is not in the first place sensed for the base rolling stand.
  • the revolution rate is sensed and corresponding signals are fed, as with the base roller installation 3, to current feeding members 15, 25, 45, 55 for corresponding driving members 13, 23, 43, 53.
  • the output signals or from the devices 1151 are fed to gates 101-105, which block signals below a certain value or amplitude and transmit signals above the same value or amplitude.
  • Such gates are of a type known in the art, consisting of two diodes and a shunt resistance, coupled to a DC polarity (i).
  • the output signals from 101 to 501 are fed to a PI device (proportional-integralamplifie-rs, composed of an amplifier shunted by a capacitance and a resistance). The output signal from rolling track).
  • said gates is an integration and a proportional amplification of the input signal of the same gate.
  • the tensile force signal for the rolling mill 2 is also fed to rolling mill 1 in front in the rolling direction (arrow A) (and possibly rolling mills even earlier in the
  • the tensile force signalfo'r the rolling mill 4 is also fed to the current feeding means for the rolling mill 5 and possibly subsequent rollin'g'r'nills.
  • the tensile force signal (broken lines in FIGURE 1) may be fed from the base mill to the angle curve device 201 of the previous rolling mill 2, from the rolling mill 2 to the angle curve 'device 101 of the rolling mill 1, etc., and from the rolling mill 4 to the angle curve device 501, etc.
  • the angle curve device is taken away but not the limitation before the PJ-link, and thev tensile force signal is "fed via the limitation and PJ-link or the input side of the current feeding 'means.
  • the PI-links will obtain signals first when a certain value is exceeded for the signal from the means 11, 21, 31, 41 and 51, etc., and this limit value should suitably be adjustable.
  • the regulation will afterwards regulate so that the tensile force between the rolling stands is constant (possibly zero) during rolling.
  • the angle curve devices are suitably replaced by a direct connection in order to obtain on the input side of the current feeding member a signal proportional to alterations from tensile force zero.
  • any of the rolling mills in the line may be chosen as base. Feeding of the rolling and tensile force signals to rolling mills lying before or after in rolling direction may be altered in relation to this.
  • FIGURE 2 shows an alternative connection for driving motor regulation. From the tachometer-generators 14, 24, 34, 44, 54 (FIG. 1) come the signals proportional to the rolling speeds, to the input side of the current feeding members (15, 25, 35, 45, 55) in the same way as shown in connection with FIGURE 1.
  • FIGURE 3 is shown a supplementation of the system according to FIGURES 1 or 2.
  • Output signals from the member 41 for the tensile force measurement with a certain minimum amplitude are fed via an angle curve device 411 and possibly a limiting device 412 to members for controlling a screw motor 46 for the mill screw,
  • a setting signal for rolling gap alterations may be fed to the screw motor.
  • the speed of the screw motor is sensed in a suitable way and this last mentioned signal may also be fed to the screw motor.
  • screw motor regulation for greater output signals from 41, etc. the desired rolling gap adjustment can be maintained and in the above Way precision regulation of the driving means 43 for the rollers 42 is obtained and other roller pairs in the chain can be regulated in the same way.
  • the dead zone, i.e. the blocked area, from 401 must be smaller (precision regulation) than the dead zone 411 (rough regulation), preferably :0.
  • the amplifiers 402, and 412 have limits and by means of suitable adjustment, help to limit the range for alterations in the revolution rate of the rolling motor 43. Simultaneously, the mill screw motor 46 receives a speed substantially proportional to the error signal.
  • Rolling mill for thin goods comprising a roller train with a first base rolling mill and at least second and third other mills, each mill comprising a housing, driving means and at least one pair of working rollers mounted in said housing, means mounting at least the housings of said second and third mills for movement in relation to the ground, at least said second and third mills being provided with means responsive to movement of the housings in two opposite directions for measuring the tensile force upon the housing resulting from the pull of the rolled goods and for producing an output signal, means to adjust the roll speed of the base mill to a desired value, means for adjusting the roll speeds of the second and third mills to other values, so as to produce a certain tensile force in the rolled goods from the adjacent mills between adjacent housings, and means to feed the output signal of the measuring means upon movement of the corresponding housing at least indirectly to the driving means of the same mill.
  • Rolling mill for thin goods comprising a roller train with a first base rolling mill and at least second and third other mills, each mill comprising 'a housing, driving means and at least one pair of working rollers mounted in at least the housings of said second and third mills, means mounting said housings for movement in relation to the ground, at least said second and third mi-lls being provided with means responsive to movement of the housings in two opposite directions for measuring the tensile force upon the housing resulting from the pull of the rolled goods and for producing an output signal, means to adjust the roll speed of the base mill to a desired value, means for adjusting the roll speeds of the second and third mills to other values, so as to produce a certain tensile force in the rolled goods from the adjacent mills between adjacent housings, said second and third mills to feed the output signal of the measuring means upon 'movement of the corresponding housing of that one of the second and third mills nearer to the base mill to the driving means of the other of said second and third mills.
  • gate means for blocking signals below a certain value and transmitting signals above the same value and means to feed the first output signal through said blocking means.
  • each mill includes a screw-down motor, means to feed the signal from the measuring means at least indirectly to the screw motor of the corresponding mill, a gate means blocking for signals below a certain value, said signal being transmitted over said gate means.
  • Rolling mill for thin goods comprising a roller train including a first rolling mill and at least second and third other mills, each of these mills comprising a housing, driving means and at least one pair of working rollers mounted in said housing, means mounting at least the housings of said second and third mills for movement with respect to the ground, first means to measure the roll speed in the base mill, means to feed the output signal of said measuring means to the driving means of said base mill, means to feed to the driving means of said base mill a speed reference signal, at least the housings of the second and third mills being provided with second measuring means responsive to movement of the housings in two opposite directions for measuring the tensile force upon the housing resulting from the pull of the rolled goods from the adjacent mills, means for feeding the output signal of said second measuring means at least indirectly to the driving means of the same mill and to at least the driving means of one mill further from the base mill, third means to measure the rolling speeds of the second and third mills, means to feed the output signals of said third measuring means to the driving means of the same mill,

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)
US191561A 1961-05-03 1962-05-01 Speed control for rocking mill stands Expired - Lifetime US3222900A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE461861 1961-05-03

Publications (1)

Publication Number Publication Date
US3222900A true US3222900A (en) 1965-12-14

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US191561A Expired - Lifetime US3222900A (en) 1961-05-03 1962-05-01 Speed control for rocking mill stands

Country Status (6)

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US (1) US3222900A (de)
BE (1) BE617144A (de)
DE (1) DE1427785B2 (de)
DK (1) DK132819C (de)
FR (1) FR1347679A (de)
GB (1) GB974908A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3650135A (en) * 1968-06-14 1972-03-21 British Iron Steel Research Control for rolling means having successine rolling stands
US4089196A (en) * 1976-03-26 1978-05-16 Sumitomo Metal Industries, Ltd. Method of controlling inter-stand tension in rolling mills
US20150082847A1 (en) * 2013-09-23 2015-03-26 Manchester Copper Products, Llc Systems and methods for drawing materials

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2541071C3 (de) * 1975-09-15 1984-07-12 Siemens AG, 1000 Berlin und 8000 München Vorrichtung zur Regelung der im Walzgut übertragenen Zugkraft in einer mehrgerüstigen kontinuierlichen Walzstraße
DE2915942A1 (de) * 1979-04-20 1980-10-30 Schloemann Siemag Ag Zugregelung bei kontinuierlichen walzstrassen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2650495A (en) * 1948-01-29 1953-09-01 Norton Co Ltd Sir James Farmer Means for measuring and indicating the tension in strip passing between the stands of a rolling mill
US2933626A (en) * 1958-10-22 1960-04-19 Westinghouse Electric Corp Sample data control apparatus
US2949799A (en) * 1956-09-25 1960-08-23 United States Steel Corp Gage-control system for multi-stand strip mill
US3036480A (en) * 1957-07-10 1962-05-29 Electron Machine Corp Automatic control of multi-stand rolling mills

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2650495A (en) * 1948-01-29 1953-09-01 Norton Co Ltd Sir James Farmer Means for measuring and indicating the tension in strip passing between the stands of a rolling mill
US2949799A (en) * 1956-09-25 1960-08-23 United States Steel Corp Gage-control system for multi-stand strip mill
US3036480A (en) * 1957-07-10 1962-05-29 Electron Machine Corp Automatic control of multi-stand rolling mills
US2933626A (en) * 1958-10-22 1960-04-19 Westinghouse Electric Corp Sample data control apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3650135A (en) * 1968-06-14 1972-03-21 British Iron Steel Research Control for rolling means having successine rolling stands
US4089196A (en) * 1976-03-26 1978-05-16 Sumitomo Metal Industries, Ltd. Method of controlling inter-stand tension in rolling mills
US20150082847A1 (en) * 2013-09-23 2015-03-26 Manchester Copper Products, Llc Systems and methods for drawing materials
US9676016B2 (en) * 2013-09-23 2017-06-13 Manchester Copper Products, Llc Systems and methods for drawing materials

Also Published As

Publication number Publication date
DK132819B (da) 1976-02-16
BE617144A (fr) 1962-08-31
GB974908A (en) 1964-11-11
FR1347679A (fr) 1964-01-04
DE1427785B2 (de) 1970-11-05
DE1427785A1 (de) 1969-07-10
DK132819C (da) 1976-07-12

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