US3777533A - Apparatus for straightening metal by stretching - Google Patents

Apparatus for straightening metal by stretching Download PDF

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Publication number
US3777533A
US3777533A US00299457A US3777533DA US3777533A US 3777533 A US3777533 A US 3777533A US 00299457 A US00299457 A US 00299457A US 3777533D A US3777533D A US 3777533DA US 3777533 A US3777533 A US 3777533A
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Prior art keywords
gearing
roll
output
differential
input
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US00299457A
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English (en)
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C Munchbach
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UNGERER I DT
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Individual
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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
    • B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
    • 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 first differential gearing has two output shafts and a compensating gear housing driven by an input shaft.
  • One output shaft of the first differential gearing is connected directly to one roll of the roll pair, while the other output shaft is connected to the other roll of the roll pair through the second differential gearingf
  • the compensating gear housing of the latter is connected to the regulator gearing which is also coupled to the second output shaft of the first differential gearing.
  • This invention relates to an apparatus for straightening a continuously running metal band of indefinite length by stretching and is of the type which has a holdback roll assembly, a mechanism for setting the degree of stretch and a drawing roll assembly, arranged dowstream of the hold-back roll assembly.
  • each roll pair or each roll group of a roll assembly there is assigned a differential gearing which, on the one hand, is directly connected with one roll or with one roll group and, on the other hand, is coupled through a drive connection with the other roll or the other roll group.
  • the rolls in each roll assembly are grouped together in such a manner that the metal band, as it is trained about successive rolls, follows a tortuous, S-path and thus undergoes alternating bending deformations.
  • a differential gearing for each two rolls there is provided a differential gearing, the housing of which is rotated by a motor.
  • a compensation is achieved by the compensating bevel gear.
  • a buildup from roll to roll of the drawing force exerted on the advancing band may occur only if the differential gearing is connected with one directly and with the other roll through a drive connection.
  • the latter is a change speed gearing which increases the direct transmission ratio of 1:1 by the value e 1.: a wherein e is the base of the natural logarithm, I].
  • a is the friction between roll and band surface and a is the looping angle (that is, the angle of circumferential engagement between the band and the roll related to the roll axis). If the aforenoted value, which determinesthe possible incremental drawing factor from one roll to the other as a function of the looping angle and the friction, is exceeded, then slippage will occur not onlyat that roll where the said value is exceeded, but also at adjacent rolls connected to the same differential gearing. Since structurally the looping angles a are given and the selected friction value ,u. is fixed in the formula ep. 0, a a -correction, if required, is not possible. Thus, such a stretch-type straightening apparatus cannot be adapted to operational requirements.
  • stretch-type straightening apparatus cannot be adapted to different moduli of elasticity of different materials and there is no possibility of regulating the adhesion in case of bands which have different surface finish, such as blank, matte, etc., or are provided with a rolled design.
  • stretchtype straightening apparatuses it is not possible to take into account the effect of roll emulsion residues and grease or oil stains on the band or on the rolls. It is also not possible to replace or regrind individual rolls subsequent to damage or wear, since a regrinding would lead to a change in the fixed transmission ratio. Consequently, the rolls have to be reground always by pair and must always have the same final diameter.
  • stretch-type straightening apparatuses of this kind are only poorly adapted for the treatment of very thin metal bands because of the effect of frictional losses in the gearing.
  • the aforenoted drive connection includes a differential gearing, the output rpm of which is alterable by a regulator gearing in accordance with the necessary rpm increase or decrease with respect to the output rpm of the first differential gearing.
  • the said regulator gearing is connected to the compensating gear carrier of the associated differential gearing.
  • FIG. 5 is a schematic view of the entire drive means for a stretch-type straightening apparatus according to the invention.
  • FIG. 6 is a schematic illustration of a gearing group corresponding to that illustrated in FIG. 2, but including spur gears.
  • the gearing group 8 includes, in addition to the first differential gearing 3, a second differential gearing 4 having two inputs and an output.
  • the first input of the second differential gearing 4 is driven by a shaft 24a which is connected, through the miter gearing 22 and the intermediate shaft 23, tothe second output shaft 20 of the first differential gearing 3.
  • the output of the second differential gearing 4 is connected to the roll 1 by a shaft 24b.
  • the second input of the second differential gearing 4 is constituted by its compensating gear carrier 40 which is driven by a regulator gearing 6 (such as a steplessly adjustable P.I.V. gearing) and a stepdown gearing 7 which is connected to the output of the regulator gearing 6.
  • any rpm error in the regulator gearing 6 will have a wholly imperceptible effect on the roll-1, since the additional rpm values generated for the roll 1 by driving the compensating gear carrier 4a are in the order of a few thousandths roll rpm.
  • FIG. 3 there is schematically shown the drive means for a drawing roll assembly formed of four rolls 1, 2, 26 and 27 in an S-arrangement.
  • a gearing group 8 that corresponds to that of FIG. 2
  • a gearing group 9 which is equivalent to the gearing group 8.
  • the driving of the corresponding first differential gearings 3 and 31 of the gearing groups 8 and 9, respectively, is effected through output shafts 18 and 18a of a gearing assembly 33 which is similar to the gearing groups 8 or 9 and which comprises a third differential gearing 10 (similar to the differential gearings 3 or 31), a fourth differential gearing 11 (similar to the differential gearing 4) and, in shunt-connection, a regulator gearing 12 having an after-connected stepdown gearing I3 affecting the compensating gear carrier Illa.
  • the regulator gearing 12 serves for altering the transmission ratio between the two output shafts of the differential gearing Ill and thus also between the drive shafts I8 and Ma.
  • the gearing assembly 33 is illustrated in more detail in FIG. 4.
  • the drive shaft 18 is connected directly with the fourth differential gearing 11, whereas the drive shaft 18a is connected through a miter gearing 32 of 1:1 transmission ratio to the third differential gearing 10.
  • the gearing assembly 33 is driven by a drive shaft 34 through a pinion 35 and a meshing ring gear 36 affixed to the compensating gear carrier 10a of the third differential gearing 10.
  • FIG. 5 shows a drive means for an entire stretch-type straightening apparatus according to the invention having a drawing roll assembly formed of four rolls ll, 2, 26 and 27 driven by a gearing arrangement identical to that of FIG. 3 and a hold-back roll assembly formed of four rolls 37, 38, 39, 40 driven by a gearing arrangement which is a mirror image of that associated with the drawing roll assembly. Since the structure of the gearing arrangement for the hold-back roll assembly is identical to that associated with the drawing roll assembly, a further discussion of the former is not deemed necessary. The aforenoted mirror image arrangement is required to ensure a buildup of the drawing effect from the roll 37 to the roll 40 in the same manner as in the drawing roll assembly in which the pull on the running band increases from the roll 1 to the roll 27.
  • the drive means of the entire apparatus is rotated by a common motor 14, the drive shaft 41 of which rotates through a pinion 42 and a ring gear 43, the compensating gear carrier 44a of a third differential gearing 44 which corresponds to the third differential gearing It).
  • the drive shaft 41 also rotates a setting gearing 15 for determining the degree of stretch.
  • the gearing 15 has an output shaft 34 constituting the drive shaft for the third differential gearing 10.
  • the setting gearing l5 effects an rpm increase of the drive shaft 34 with respect to the drive shaft 41 by an rpm resulting in the desired degree of stretch for the band.
  • FIG. 6 there is shown a gearing group 8a for a roll pair formed of rolls 1 and 2.
  • This gearing group corresponds essentially to that shown in FIG. 2, but instead of the miter gearings 211, 22 and 25 there are provided spur gearings 45 and 46 which result in a different spatial arrangement of the differential gearings 3 and 4.
  • the differential gearing 3 is connected directly with the differential gearing 4 through an intermediate shaft 47 which, by virtue of the spur gearing 46, drives the regulator gearing 6, while the output shaft of the differential gearing 4 rotates through the spur gearing 45, a drive shaft 48 of the roll 1.
  • a drive means for an apparatus for straightening a running metal band by bending and stretching said apparatus being of the known type that has (a) a holdback roll assembly formed of at least one pair of rolls about which said band is trained in an S-shaped path, (b) a drawing roll assembly disposed downstream of said hold-back roll assembly and formed of at least one pair of rolls about which said band is trained in an S- shaped path, (0) a gearing for setting the degree of stretch between said roll assemblies, comprising a gearing group, one associated with each roll pair and having A. a gearing group input shaft,
  • a differential gearing having 1. a compensating gear carrier forming an input and driven by said gearing group input shaft, 2. a first output connected with a 1:1 transmission ratio with one roll of the roll pair, 3. a second output, C. a second differential gearing having 1. a first input connected with a 1:1 transmission ratio to said second output of said first differential gearing,
  • an apparatusfor straightening a running metal band by bending and stretching said apparatus being of the known type that has (a) a hold-back roll assembly formed of at least one pair of rolls about which said band is trained in an S-shaped path, (b) a drawing roll assembly disposed downstream of said hold-back roll assembly and formed of at least one pair of rolls about which said band is trained in an S-shaped path, (c) first differential gearings, one associated with each roll pair, each first differential gearing being connected to one roll of the associated roll pair directly and to the other roll of the same roll pair by means of a drive connection, the improvement comprising A. a second differential gearing coupled to said drive connection and having a compensating gear carrier and B. a regulator gearing connected at least indirectly to said compensating gear carrier for varying the output rpm of said second differential gearing as a function of the required rpm alteration with respect to the first differential gearing associated with the same roll pair.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
  • Friction Gearing (AREA)
US00299457A 1971-10-21 1972-10-20 Apparatus for straightening metal by stretching Expired - Lifetime US3777533A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2152496A DE2152496C2 (de) 1971-10-21 1971-10-21 Streckrichtanlage

Publications (1)

Publication Number Publication Date
US3777533A true US3777533A (en) 1973-12-11

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ID=5823022

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US00299457A Expired - Lifetime US3777533A (en) 1971-10-21 1972-10-20 Apparatus for straightening metal by stretching

Country Status (9)

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US (1) US3777533A (enrdf_load_stackoverflow)
AT (1) AT316266B (enrdf_load_stackoverflow)
BE (1) BE790378A (enrdf_load_stackoverflow)
CA (1) CA972224A (enrdf_load_stackoverflow)
DE (1) DE2152496C2 (enrdf_load_stackoverflow)
FR (1) FR2156732B1 (enrdf_load_stackoverflow)
GB (1) GB1344406A (enrdf_load_stackoverflow)
IT (1) IT969771B (enrdf_load_stackoverflow)
SE (1) SE395117B (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4408474A (en) * 1980-07-10 1983-10-11 Fa. Erwin Kampf Gmbh & Co. Metal strip stretching mill
US4711112A (en) * 1981-07-06 1987-12-08 Nilsson Einar W Straightening machines and methods
US4903518A (en) * 1986-10-13 1990-02-27 Hitachi, Ltd. Roll driving apparatus for rolling mill
US4998338A (en) * 1988-11-05 1991-03-12 Sms Schloemann-Siemag Aktiengesellschaft Method and arrangement for manufacturing hot-rolled steel strip

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2516409B1 (fr) * 1981-11-13 1987-07-17 Sumitomo Metal Ind Procede de correction d'un materiau lamine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3427848A (en) * 1965-08-23 1969-02-18 Forges De La Loire Cie Des Ate Devices for cold-rolling and planishing metal sheet
US3626737A (en) * 1968-12-27 1971-12-14 Wean Ind Inc Bridles

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3427848A (en) * 1965-08-23 1969-02-18 Forges De La Loire Cie Des Ate Devices for cold-rolling and planishing metal sheet
US3626737A (en) * 1968-12-27 1971-12-14 Wean Ind Inc Bridles

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4408474A (en) * 1980-07-10 1983-10-11 Fa. Erwin Kampf Gmbh & Co. Metal strip stretching mill
US4711112A (en) * 1981-07-06 1987-12-08 Nilsson Einar W Straightening machines and methods
US4903518A (en) * 1986-10-13 1990-02-27 Hitachi, Ltd. Roll driving apparatus for rolling mill
US4998338A (en) * 1988-11-05 1991-03-12 Sms Schloemann-Siemag Aktiengesellschaft Method and arrangement for manufacturing hot-rolled steel strip

Also Published As

Publication number Publication date
AT316266B (de) 1974-07-10
FR2156732B1 (enrdf_load_stackoverflow) 1975-01-03
DE2152496B1 (de) 1973-01-25
GB1344406A (en) 1974-01-23
DE2152496C2 (de) 1975-11-27
IT969771B (it) 1974-04-10
BE790378A (fr) 1973-02-15
DE2152496A1 (enrdf_load_stackoverflow) 1973-01-25
SE395117B (sv) 1977-08-01
FR2156732A1 (enrdf_load_stackoverflow) 1973-06-01
CA972224A (en) 1975-08-05

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