US3889505A - Process and an apparatus for regulating the drive or deceleration of power driven or decelerated rollers in drawing and straightening installations - Google Patents

Process and an apparatus for regulating the drive or deceleration of power driven or decelerated rollers in drawing and straightening installations Download PDF

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Publication number
US3889505A
US3889505A US436920A US43692074A US3889505A US 3889505 A US3889505 A US 3889505A US 436920 A US436920 A US 436920A US 43692074 A US43692074 A US 43692074A US 3889505 A US3889505 A US 3889505A
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United States
Prior art keywords
roller
strip
section
rollers
drive
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Expired - Lifetime
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US436920A
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English (en)
Inventor
Josef Ihle
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UNGERER IRMA
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Ungerer Irma
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Publication date
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B21D1/05—Stretching combined with rolling

Definitions

  • the present invention relates to a process and apparatus for regulating the power drive or deceleration of rollers in installations in which a strip of material, preferably a metal strip, is passed under stretching tension across a plurality of rollers; and more particularly in drawing and straightening installations.
  • a metal strip is stretched between a hold-back frame provided with a braked roller and a drawing frame provided with a power driven roller.
  • This braking can be considered as a negative power drive.
  • the drawing force must first be applied to that section of the strip to be stretched as an additional drawing force and must then be removed from the strip via the driven rollers as it leaves this section.
  • Sliding not only occurs when the friction force between the roller and the strip is exceeded, but also when a longer strip section per unit of time is supplied to a roller driven at a constant rate of revolution that corresponds to the distance covered by the circumference of the roller in this time.
  • the length of the section of strip supplied per unit of time can be increased, for example, through a permanent elongation imparted to the strip during its passage over preceding rollers.
  • a development of the present invention therefore, consists in that the elongation variations are examined in the form of differences in the speed of the end section of the strip on the delivery side of the roller in relation to the speed of the end section of the strip on the feed side of the roller. And then instead of the speed of the strip section on the feed side of the roller, the circumferential speed of the roller and the speed of the section of strip being delivered by the roller are measured and the measurements converted into electrical impulses and transmitted in this form. During operation, should the circumferential speed ofthe roller and the speed of the strip section on the feed side of the roller no longer correspond. a greater sensitivity of the difference readings will result from taking the circumferential speed of the roller as a basis.
  • an apparatus for effecting the process according to the present invention is characterized in that the circumferential speed of the roller and the delivery section of the strip are measured by means of measuring wheels which drive function generators supplying electrical impulses, the number of which is proportional to the rate of rotation of the roller.
  • a compan ator is provided which determines the variations of the predetermined values and the predetermined difference in the rate of rotation as a measurement of the variation in elongation.
  • an auxiliary drive means is provided and is adapted to be controlled by this comparator and designed to drive electric regulating devices for influencing the power drive or deceleration means of the rollers.
  • a development of the apparatus according to the present invention consists in that the looping angle at which the strip engages the roller is made larger by a reserve amount than would be necessary given an average coefficient of friction and slip-free operation in order to maintain a specific desired difference between the drawing forces acting on the end section of the strip on the feed side of the roller and the section of the strip on the delivery side of the roller.
  • the friction value is reduced for some reason, for example, owing to soiling or to the use of a different strip material which produces a smaller friction value on the material on the circumference of the roller, the differences in the drawing tension and thus the drawing forces remain unchanged without any slipping occurring.
  • the presetting device for the nominal value and the comparators for indicating the preset values and the values determined (nominal value actual value comparators) give the indications in numeri cal form. The possibility of reading the values continuously facilitates operation.
  • FIG. 1 is a diagram illustrating a two roller hold-back frame of a drawing and straightening installation according to the present invention.
  • FIG. 2 is a block diagram according to the present invention related to a roller of a drawing and straightening installation.
  • a strip 3 is looped about rollers l and 2 in an S-shaped manner.
  • the circumferential speed of the roller 1 which is equal to the speed of the section of strip 3 which is being supplied to this roller is measured by means of a measuring wheel 19, while the speed of the strip section being delivered by the roller I is measured by means of the measuring wheel 20.
  • the circumferential speed of the roller 2 is measured by means of the measuring wheel 21, while the speed of the strip section being delivered by the roller 2 is measured by means of a measuring wheel 22.
  • the measuring wheels are in driving connection with function generators 24, 25, 26 and 27.
  • the function generators transmit a very large number of electrical impulses per rotation of the wheels.
  • the strip 3 is looped about the roller I at a looping angle a, and the roller 2 at a looping angle (1
  • the roller 1 rotates in the direction of the arrow 4 in FIG. I, that is, in a clockwise direction.
  • the roller 2 rotates in the direction of the arrow 5 in FIG. 1, thus in a counterclockwise direction.
  • the drawing force S] acts on the end of the strip section on the feed side of the roller 1, while the drawing force S2 acts on that portion of the strip section passing between the rollers 1 and 2, that is, that portion which is being delivered by the roller 1 and supplied to the roller 2.
  • the drawing force S3 acts on the strip section being delivered by the roller 2. Tensile stresses 0'] to 0'3 correspond to the drawing forces S1 to S3.
  • the drawing force S1 increases by an amount Z1 to S2.
  • the drawing force 82 increases by an amount Z2 to S3.
  • Specific elongation quantities correspond to the individual drawing forces. The elongation of a unit length of the strip thus in creases with the drawing forces and with the tensile stresses corresponding thereto.
  • the drawing forces S1 S3 correspond to elongations 61 to 3 per unit length of the strip.
  • the elastic elongations e per unit length of the strip and the tensile stresses 0' in the strip are related by the modulus of elasticity E according to the equation 6 0'/E.
  • the roller 1 is connected to a regulatable direct current motor 31 via gearing 28, stepdown gearing 29 and a motor coupling 30.
  • a nomi nal value presetting device 32 which is connected to a nominal-actual value comparator 34, is engaged at a predetermined value corresponding to a specific increase in elongation A6,.
  • the desired regulating sensitivity is engaged by means of a regulatorprecision adjustment device 33.
  • the function generator 24 driven by the measuring wheel 19 transmits to the nominalactual value comparator 34 the information in the form of electric impulses regarding the circumferential speed of the roller 1 which, as long as no slipping occurs, is equal to the speed of the strip 3 corresponding to the elongation 6,.
  • the function generator 25 driven by the measuring wheel 20 running on the strip 3 transmits to the nominalactual value comparator 34 the data including the actual increase in elongation A6,.
  • the direct current motor is regulated according to the result of the comparison in the comparator 34 via a current regulator 35 and an output step 36 in such a manner that the actual value balances out the predetermined nominal value with the regulating precision with which the regulator-precision adjustment device has been provided.
  • the electromagnetic slip couplings In devices comprising compound drives, the electromagnetic slip couplings. servomotors or regulating gears for regulating the rates of rotation and/or torques of individual rollers via differentials during the mechanical shunt, can be controlled in the same manner.
  • a process according to claim 1, wherein the elongation variations are determined by measuring the differences in the circumferential speed of the roller and the speed of the section of strip of material leaving the roller and wherein the utilization of the comparison results in converting the compared differences into electrical impulses for transmission.
  • An apparatus for regulating the drive or deceleration of power driven or decelerated rollers in installations in which a strip of material, preferably a metal strip, is passed across a plurality of rollers under a stretching tension, more particularly in drawing and straightening installations, comprising for each roller: measuring wheels operatively associated with the roller for respectively measuring the circumferential speed of the roller and the section of strip of material leaving the roller; a function generator connected to each wheel, each said function generator supplying electrical impulses, the number of which is proportional to the number of revolutions of the wheel; a nominal valuepresetting device for establishing a predetermined value; a comparator receiving the electrical impulses for determining the difference between the measurement of the circumferential speed of the roller and the section of strip of material leaving the roller and comparing this difference to the predetermined value; and roller drive means receiving the comparator output for regulating the drive of said drive means.
  • a device wherein the strip of material defines a loop angle in its engagement with each roller, said angle being selected so that it is greater than is necessary by a reserve amount with a given friction value and with slip-free operation occurring between the strip of material and the roller, and wherein because of the reserve amount a specific desired difference between the drawing forces on the section of strip of material approaching the roller and the section of strip of material leaving the roller is maintained.
US436920A 1973-02-07 1974-01-28 Process and an apparatus for regulating the drive or deceleration of power driven or decelerated rollers in drawing and straightening installations Expired - Lifetime US3889505A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2305777A DE2305777C3 (de) 1973-02-07 1973-02-07 Verfahren und Vorrichtung zum Regeln des Antriebs oder der Bremsung von kraftgetriebenen oder gebremsten Walzen, insbesondere in Streckrichtanlagen

Publications (1)

Publication Number Publication Date
US3889505A true US3889505A (en) 1975-06-17

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US436920A Expired - Lifetime US3889505A (en) 1973-02-07 1974-01-28 Process and an apparatus for regulating the drive or deceleration of power driven or decelerated rollers in drawing and straightening installations

Country Status (8)

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US (1) US3889505A (de)
AT (1) AT324804B (de)
BE (1) BE810710A (de)
DE (1) DE2305777C3 (de)
FR (1) FR2216816A5 (de)
GB (1) GB1440987A (de)
IT (1) IT998950B (de)
SE (1) SE400532B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010020488A1 (de) * 2008-08-20 2010-02-25 Siemens Aktiengesellschaft Verfahren zur steuerung/oder regelung einer antriebslast eines eine rolle eines rollenverbunds antreibenden motors, steuer- und/oder regeleinrichtung, maschinenlesbarer programmcode, speichermedium und industrieanlage

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6120622A (ja) * 1984-07-10 1986-01-29 Mitsubishi Heavy Ind Ltd テンシヨンレベラ制御方法
ITMI20130229A1 (it) 2013-02-19 2014-08-20 I Spianatrice a rulli per lamiere e procedimento per spianare con essa una lamiera
DE102017101777B4 (de) 2017-01-30 2022-09-08 Andritz Metals Germany Gmbh Biegerichtmaschine und Verfahren zum Biegerichten eines metallischen Flachprodukts

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2333864A (en) * 1942-01-15 1943-11-09 Carnegie Illinois Steel Corp Extensometer
US2519818A (en) * 1946-02-23 1950-08-22 Acieries Et Forges Firminy Rolling mill with set elongation
US2526296A (en) * 1943-08-12 1950-10-17 United Eng Foundry Co Method and apparatus for processing strip metal
US3559431A (en) * 1968-02-15 1971-02-02 Bwg Bergwerk Walzwerk Apparatus for stretching continuous bands
US3783667A (en) * 1971-04-14 1974-01-08 Ungerer Irma Apparatus for straightening metal by stretching

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2333864A (en) * 1942-01-15 1943-11-09 Carnegie Illinois Steel Corp Extensometer
US2526296A (en) * 1943-08-12 1950-10-17 United Eng Foundry Co Method and apparatus for processing strip metal
US2519818A (en) * 1946-02-23 1950-08-22 Acieries Et Forges Firminy Rolling mill with set elongation
US3559431A (en) * 1968-02-15 1971-02-02 Bwg Bergwerk Walzwerk Apparatus for stretching continuous bands
US3783667A (en) * 1971-04-14 1974-01-08 Ungerer Irma Apparatus for straightening metal by stretching

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010020488A1 (de) * 2008-08-20 2010-02-25 Siemens Aktiengesellschaft Verfahren zur steuerung/oder regelung einer antriebslast eines eine rolle eines rollenverbunds antreibenden motors, steuer- und/oder regeleinrichtung, maschinenlesbarer programmcode, speichermedium und industrieanlage

Also Published As

Publication number Publication date
DE2305777B2 (de) 1979-08-02
FR2216816A5 (de) 1974-08-30
DE2305777A1 (de) 1974-08-15
GB1440987A (en) 1976-06-30
BE810710A (fr) 1974-05-29
SE400532B (sv) 1978-04-03
DE2305777C3 (de) 1980-04-03
AT324804B (de) 1975-09-25
IT998950B (it) 1976-02-20

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