US3783667A - Apparatus for straightening metal by stretching - Google Patents

Apparatus for straightening metal by stretching Download PDF

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Publication number
US3783667A
US3783667A US00240135A US3783667DA US3783667A US 3783667 A US3783667 A US 3783667A US 00240135 A US00240135 A US 00240135A US 3783667D A US3783667D A US 3783667DA US 3783667 A US3783667 A US 3783667A
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United States
Prior art keywords
roll
rolls
assembly
rpm
hold
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Expired - Lifetime
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US00240135A
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English (en)
Inventor
C Munchbach
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UNGERER I DT
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Ungerer Irma
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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
    • 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
    • B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers

Definitions

  • ABSTRAQCT In an apparatus for straightening a contznuously run- 1 ning metal strip with a stretching operation, there prol Foreign Applicatiofl Priority Data vided a hold-back roll assembly and a drawing roll as- Apr. 14, 1971 Germany ..P 21 18 051.8 sembly; every roll in both roll assemblies has the same diameter and is, with the exception of the fastest roll [52] U.S. Cl.
  • This invention relates to an apparatus for straightening a continuously advanced metal article, such as a metal strip, by a stretching operation.
  • the apparatus is of the type that has a hold-back assembly formed of rolls in an S-arrangement, a device for setting the degree of stretch, and a drawing assembly formed of rolls in an S-arrangement. All the rolls have the same diameter and are rotatable by a common drive motor.
  • the required step-down or step-up in the peripheral velocities of the different rolls is effected by differential gearings.
  • a differential gearing is provided for every two rolls.
  • the drive means is coupled to the differential housing.
  • a compensation is effected by means of the compensating bevel gear of the differential gearing.
  • a buildup of the tension from one roll to the other may occur only if the differential gearing is connected directly with one roll and through an intermediate ratio changing device with the other roll.
  • the ratio changing device increases the direct transmission ratio of 1:1 by the value e to be discussed later.
  • both the hold-back roll assembly and the drawing roll assembly with each roll, with the exception of the roll driven with the highest or lowest speed in each roll assembly, there is associated a differential gearing, whose output rpm at the compensating gear carrier is variable by means of a regulating device in accordance with the required rpm increase or decrease with respect to the adjacent roll.
  • each roll its rpm may be adapted to the modulus of elasticity of the material to be treated. Furthermore, in the determination of the roll rpm it is possible to take into account the adhesion effect of the strip surface, the frictional value of the individual rolls, as well as the change in the frictional values. The latter may occur due to the soiling of the rolls, the presence of oil or grease smudges, roll wear and regrinding.
  • the frictional losses in the drive gear assembly dependent upon operational conditions (such as starting or braking), load conditions, the advancing speed of the material or the room temperature, do not eflect the accu racy of the set magnitudes transmitted from the drive gear assembly to the rolls.
  • the aforenoted losses burden solely the motor which operates the drive gear assembly and have no effect on the value of strip adhesion of the individual rolls.
  • FIG. 1 is a diagrammatic view of an S-type roll assembly formed of three rolls;
  • FIG. 2 is a block diagram illustrating schematically the stretch-type straightening apparatus according to the invention and FIGS. 3, 4 and 5 are block diagrams of modified arrangements of the drive gear assemblies according to the invention.
  • FIG.1 a metal strip is trained in an S-configuration about parallel supported rolls 1, 2 and 3. Rolls 1 and 3 are at the same height whereas roll 2 is displaced therebelow.
  • p. is the value of friction between roll and strip face
  • a is the looping angle and S and S are the strip tensions upstream and downstream of the roll 1, respectively,
  • A is the length increase of the strip between two rolls
  • F is the sectional area of the strip and E is the modulus of elasticity of the strip material
  • strip exposed to the pulling force S S undergoes along the length 1 between the run-off point of the roll 1 and the run-up point of roll 2 an elastic elongation A, which is a function of the modulus of elasticity E of the material and the pulling force S
  • This elongation x must be taken up slip-free by the roll 2 which is achieved by increasing the peripheral velocity thereof.
  • the circumferential velocities of the invididual rolls in the hold-back assembly have to increase from roll to roll, while they have to decrease in the drawing assembly.
  • This change in the circumferential velocity of the rolls may be achieved either by providing rolls of different diameters in which case the rpms are identical or, if the roll diameters are the same, then the rpm s have to be different.
  • FIG. 2 there is schematically shown a drive gear assembly with the aid of which the different peripheral velocities of the rolls may be set, while each roll diameter has the same value.
  • the drive gear assembly according to this exemplary embodiment serves a hold-back assembly and a drawing assembly formed of four rolls each.
  • the holdback assembly has four rolls 16, 17, 18 and 19 and the drawing assembly has four rolls 20, 21, 22 and 23. All these rolls are engaged by a running strip (not shown) in a manner similar to that illustrated in the three-roll S-assembly described with reference to FIG.1.
  • rolls 16, 19 are the outermost rolls, while rolls 17, 18 are intermediate rolls, whereas in the drawing roll assembly rolls 20, 23 are the outermost rolls, while rolls 21, 22 are intermediate rolls. It is further apparent that the material, when the entire straightening apparatus is considered, runs onto roll 16 and runs off roll 23.
  • a drive motor 24 which rotates a main drive shaft 25 of the hold-back assembly.
  • the shaft 25 drives a stretch setting device 26 having an output shaft 27 which constitutes the main drive shaft for the drawing assembly. Since the drive gear assembly associated with the drawing assembly is identical in structure and operation to that of the hold-back assembly, in the description that follows only the drive gear assembly of the latter will be set forth in detail.
  • the main drive shaft 25 rotates the first roll 16 through a miter gear 28 and a drive shaft 29.
  • the first roll 16 of the hold-back assembly turns with the smallest rpm with respect to the other rolls 17-19.
  • Each roll 17, 18, 19 rotates somewhat faster than the preceding roll in the hold-back assembly; for this purpose, each roll 17, 18, 19 is connected with the main drive shaft 25 through a separate gear assembly 40 which has two input shafts 31 and 35 driven through miter gears 30 and 34 by the main drive shaft 25.
  • each gear assembly 40 in the hold-back assembly is of identical structure and function, only that associated with roll 17 is described in detail.
  • the output shaft 33 extending from the gear assembly 40 is connected with the roll 17.
  • the gear assembly 40 includes a differential gearing 32 which is driven by the input shaft 31 and which has an output shaft that constitutes the output shaft 33 of the gear assembly 40.
  • the input shaft 35 is associated with a steplessly adjustable non-slip gear ratio regulating device 36 (for example, a P.I.V. drive), which, in turn, is connected with the compensating gear carrier of the differential gearing 32 through an intermediate shaft 37, a step-down gear 38 and a further intermediate shaft 39.
  • the rotational direction of the intermediate shaft 39 is so selected that the rpm of the output shaft 33 is increased with respect to the input shaft 31 to correspond to the required rpm increase of the roll 17 with respect to the roll 16.
  • the roll 17 has a somewhat higher peripheral velocity than that of the roll 16 for taking up the afore-explained strip elongation A
  • the extent of the rpm increase which depends on factors discussed earlier, is automatically or manually regulated in a stepless manner with the regulating device 36. With a correspondingly large control range of the regulating devices 36 any desired roll rpm may be set in the other gear assemblies 40.
  • the stretch setting device 26 By means of the stretch setting device 26, the rpm of the main drive shaft 25 transmitted to the hold-back assembly is transformed, as a function of the extent of pull, into a higher rpm for the main drive shaft 27 and is thus transmitted to each gear assembly 40 of the drawing assembly.
  • each roll assembly that is, the hold-back roll assembly 16-19 and the drawing roll assembly 20-23
  • the rolls having the highest rpm, that is rolls 19 and 20 are directly driven by the main drive shafts 25 and 27,whereas the adjoining rolls of decreasing rpms are driven by the gear assemblies 40.
  • the holdback assembly corresponds to the arrangement according to FIG. 2 and the drawing assembly corresponds to the arrangement according to FIG. 3.
  • the individual gear assemblies 40 of the hold-back assembly transmit an increasing rpm in the direction of the roll 19, whereas the individual gear assemblies 40 of the drawing assembly operate with decreasing rpms.
  • the holdback assembly corresponds to the arrangement according to FIG. 3 and the drawing assembly corresponds to the arrangement according to FIG. 2.
  • the roll 19 is driven directly, whereas the preceding rolls are driven with gradually decreasing rpms.
  • the roll with the lowest rpm that is, roll 23
  • the preceding rolls are driven by means of the individual gear assemblies 40 with increasing rpms starting with roll 22 down to roll 20.
  • the drive motor 24, as it can be observed from FIGS. 2-5, is associated in each case with the miter gear of the hold-back assembly from which the driving of the corresponding roll is effected in a direct manner.
  • the regulating devices 36 operate in a shunted manner, and further, since the output rpm of each regulating device is significantly decreased by an associated stepdown gear, the effect on the roll of any possible rpm error in its regulating device is reduced to a negligible value. This is so, because the roll rpm increments generated by driving the compensating gear carrier of the differential gearing, are in the range of a few thousandths of the rpm of the roll.
  • a stretch-type straightening apparatus of the known type that has (a) a hold-back roll assembly formed of a plurality of rolls in an S-arrangement, two of the rolls in the hold-back roll assembly being outermost rolls and the remainder being intermediate rolls, (b) means for driving each roll in said hold-back roll assembly with an rpm that is greater than the rpm of any of the upstream rolls in the hold-back roll assembly, (c) a drawing roll assembly formed of a plurality of rolls in an S-arrangement, two of the rolls in the drawing roll assembly being outermost rolls and the remainder being intermediate rolls, all the rolls in both for driving each roll in said drawing roll assembly with an rpm that is smaller than the rpm of any of the upstream rolls in said drawing roll assembly, (e) a stretchsetting device determining the extent of material tension between the two roll assemblies and (f) a common drive motor for rotating all the rolls, the improvement comprising A.
  • each differential gearing having a compensating gear carrier and B.
  • a separate regulating device connected at least indirectly to the compensating gear carrier of each differential gearing for providing an rpm of the associated roll that is different from the rpm of any other roll in the same roll assembly.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
US00240135A 1971-04-14 1972-03-31 Apparatus for straightening metal by stretching Expired - Lifetime US3783667A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2118051A DE2118051C3 (de) 1971-04-14 1971-04-14 Streckrichtanlage

Publications (1)

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US3783667A true US3783667A (en) 1974-01-08

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US00240135A Expired - Lifetime US3783667A (en) 1971-04-14 1972-03-31 Apparatus for straightening metal by stretching

Country Status (9)

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US (1) US3783667A (fr)
AT (1) AT311765B (fr)
BE (1) BE781993A (fr)
CA (1) CA969001A (fr)
DE (1) DE2118051C3 (fr)
FR (1) FR2133558B1 (fr)
GB (1) GB1358936A (fr)
IT (1) IT950137B (fr)
SE (1) SE370505B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3889505A (en) * 1973-02-07 1975-06-17 Ungerer Irma Process and an apparatus for regulating the drive or deceleration of power driven or decelerated rollers in drawing and straightening installations
US4408474A (en) * 1980-07-10 1983-10-11 Fa. Erwin Kampf Gmbh & Co. Metal strip stretching mill
EP1245301A2 (fr) * 2001-03-26 2002-10-02 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh Dispositif de redressage par étirage pour bandes d'acier ou de métal
WO2010020488A1 (fr) * 2008-08-20 2010-02-25 Siemens Aktiengesellschaft Procédé de commande/régulation d’une charge d’entraînement d’un moteur actionnant une poulie d’un ensemble de poulies, dispositif de commande et/ou de régulation, code de programme lisible par ordinateur, support de stockage et installation industrielle

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE793477A (fr) * 1972-11-28 1973-04-16 Bwg Dispositif de tension pour bandes a circulation
GB2174027B (en) * 1985-04-20 1988-07-13 Bwg Bergwerk Walzwerk Process and equipment for continuous flattening of particularly thin metal strip
DE102004048658A1 (de) * 2004-10-06 2006-04-20 Sms Demag Ag Vorrichtung zum kontinuierlichen Zugrecken eines Metallbandes und Verfahren zum Betreiben einer solchen Vorrichtung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3362202A (en) * 1964-07-03 1968-01-09 Loire Atel Forges Strip tensioning apparatus
US3377830A (en) * 1965-06-18 1968-04-16 United States Steel Corp Method and apparatus for reducing strip
US3427848A (en) * 1965-08-23 1969-02-18 Forges De La Loire Cie Des Ate Devices for cold-rolling and planishing metal sheet
US3580033A (en) * 1968-02-16 1971-05-25 Loire Atel Forges Rolling mill for producing thin strip stock
US3626737A (en) * 1968-12-27 1971-12-14 Wean Ind Inc Bridles
US3641797A (en) * 1970-02-05 1972-02-15 American Metal Climax Inc Stretcher leveling system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3362202A (en) * 1964-07-03 1968-01-09 Loire Atel Forges Strip tensioning apparatus
US3377830A (en) * 1965-06-18 1968-04-16 United States Steel Corp Method and apparatus for reducing strip
US3427848A (en) * 1965-08-23 1969-02-18 Forges De La Loire Cie Des Ate Devices for cold-rolling and planishing metal sheet
US3580033A (en) * 1968-02-16 1971-05-25 Loire Atel Forges Rolling mill for producing thin strip stock
US3626737A (en) * 1968-12-27 1971-12-14 Wean Ind Inc Bridles
US3641797A (en) * 1970-02-05 1972-02-15 American Metal Climax Inc Stretcher leveling system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3889505A (en) * 1973-02-07 1975-06-17 Ungerer Irma Process and an apparatus for regulating the drive or deceleration of power driven or decelerated rollers in drawing and straightening installations
US4408474A (en) * 1980-07-10 1983-10-11 Fa. Erwin Kampf Gmbh & Co. Metal strip stretching mill
EP1245301A2 (fr) * 2001-03-26 2002-10-02 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh Dispositif de redressage par étirage pour bandes d'acier ou de métal
EP1245301A3 (fr) * 2001-03-26 2003-05-07 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh Dispositif de redressage par étirage pour bandes d'acier ou de métal
WO2010020488A1 (fr) * 2008-08-20 2010-02-25 Siemens Aktiengesellschaft Procédé de commande/régulation d’une charge d’entraînement d’un moteur actionnant une poulie d’un ensemble de poulies, dispositif de commande et/ou de régulation, code de programme lisible par ordinateur, support de stockage et installation industrielle

Also Published As

Publication number Publication date
SE370505B (fr) 1974-10-21
DE2118051B2 (de) 1973-04-05
GB1358936A (en) 1974-07-03
CA969001A (en) 1975-06-10
DE2118051C3 (de) 1975-10-23
FR2133558A1 (fr) 1972-12-01
AT311765B (de) 1973-12-10
FR2133558B1 (fr) 1975-06-13
BE781993A (fr) 1972-07-31
IT950137B (it) 1973-06-20
DE2118051A1 (de) 1972-10-19

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