US3818739A - Apparatus for straightening metal strips - Google Patents

Apparatus for straightening metal strips Download PDF

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Publication number
US3818739A
US3818739A US00014342A US16484171A US3818739A US 3818739 A US3818739 A US 3818739A US 00014342 A US00014342 A US 00014342A US 16484171 A US16484171 A US 16484171A US 3818739 A US3818739 A US 3818739A
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United States
Prior art keywords
straightening
rollers
support
group
rolls
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Expired - Lifetime
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US00014342A
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English (en)
Inventor
C Munchbach
H Weber
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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

Definitions

  • the invention relates to machines for straightening a metal strip passed therethrough in a tensioned condition.
  • the straightening operation itself is performed by straightening rolls held by support rolls or support rollers.
  • the straightening operation in straightening machines is effected by alternately bending, to one side and the other, the metal strip passing through the apparatus. At and nearthe surface of the strip thebending stresses exceed the flow limit. Particularly in the case of thin metal strips, however, the flow limit often does not extendas deep as the neutral axis following the alternate bending and consequently,'the strip does not deform plastically and uniformly across its entire crosssection. Although a strip so straightened may optically appear to be planar, it is not free from internal stresses. These residual stresses may be of different magnitudes at different locations; this way have'an undesirable effect during subsequent use of the product.
  • thin and very thin metal sheets or strips having a thickness of 0.06 to 0.8 millimeter are straightened by means of simple stretching which is performed along a strip length tensioned between a roll assembly also designated as an S-assembly.
  • S- assemblies include a plurality of parallel rolls of relatively large diameters (for example, 600 to 1,000 millimeters) around which the strip is trained to pass in a simple or multiple S-form. It is advantageous that the strip surrounds the rolls over a large angle so that substantialfrictional forces may be transmitted.
  • One of two such S-assemblies serves to hold back the running strip against the pulling force imparted thereto so that a hold-back pull" is generated.
  • the second S- assembly pulls the strip against the hold-back force and is adjustable to vary the pulling force for controlling the tension of the strip. It is known to provide a straightening machine between such S-assemblies to obtain, even in the case of thicker strips, better straightening results than if a straightening machine alone is used. Thus, with such an arrangement the versatility of these machines may be increased without the necessity of augmenting the stretching force. This result may be achieved with a pulling force which is substantially smaller than a sole pulling force thatwould cause flowing of the strip.
  • the straightening rolls usually rest on supporting rolls or rollers, each of which supports two adjacent straightening rolls.
  • a support roll-or roller is disposed in such a manner between two adjacent straightening rolls that it is in contact with both.
  • the invention is based on the recognition that the supporting rollers or rolls which simultaneously contact adjacent straightening rolls, effect a coupling therebetween by virtue of a transferable friction force appearing during the application of the straightening pressure. Due to the aforenoted coupling, adjacent straightening rolls are constrained to rotate with exactly the same speed. When, however, a strip is passed through the straightening machine under a stretching pull, it increases in length as it passes from one straightening roll to an adjacent one, so that strip lengths of different magnitudes pass over adjacent straightening rolls during identical lengths of time. Thus, if it is desired to avoid slip marks on the sensitive surfaces of the strips, the straightening rolls should rotate at different speeds.
  • each straightening roll is supported only by support rollers associated with that straightening roll alone, that is, each support roll or roller is in contact only with one straightening roll.
  • each of the straightening rolls rests, as in known apparatus, on a plurality of support rollers arranged in rows along the length of each straightening roll at identical heights.
  • the rollers of each row are disposed in an alternately staggered manner so that in each instance one particular support roller is in contact with a first straightening roll while the next support roller of the same row engages an adjacent straightening roll.
  • each straightening roll may adjust itself to the speed of the passing strip independently of the rotational speed of adjacent straightening rolls. This arrangement ensures that there will be no slippage of the strip on any of the straightening rolls and consequently, no slip marks will appear on the surface of the strip.
  • FIG. 6 is a partial schematic plan view of a second embodiment
  • FIG. 7 is a sectional view along line VII-VII of FIG. 6.
  • FIGS. 1 and 2 there is schematically shown a conventional straightening arrangement including radially spaced, horizontally juxtaposed upper straightening rolls 1 (only one shown) and radially spaced, horizontally juxtaposed lower straightening rolls 2, each of the latter resting on a plurality of axially spaced rollers 3. It is seen from FIG. 2 that each support roller 3 (with the exception of the first and last roller) is in contact with two adjacent straightening rolls 2.
  • FIGS. 3 to 5 it is seen that the lower straightening rolls 23, 24 and 25 rest on a plurality of support rollers which are disposed at identical heights in successive rows parallel with the straightening rolls and which may be vertically adjustable in a known manner.
  • the support rollers form a first group consisting of rollers 4 and a second group consisting of rollers 5.
  • Each row of support rollers consists of a plurality of rollers 4 and 5 arranged alternately and disposed in such a manner that support rollers 4 forming said first group are staggered or offset laterally to their axis by a distance a (FIG. 3) with respect to support rollers 5 forming said second group.
  • each individual lower straightening roll is supported only by one group of support rollers which are not in engagement with any other straightening roll.
  • the straightening roll 23 rests on support rollers 4 of a first and adjacent second row
  • the straightening roll 24 is engaged by support rollers 5 of said second row and an adjacent third row
  • straightening roll 25 is supported by support rollers 4 of said third row, etc.
  • each straightening roll has a cradle-like support formed of at least one pair of support rollers. Any one straightening roll may rest on several pairs of support rollers, all belonging, however, to the same group.
  • any one support roller is in contact only with a sole straightening roll. It is to be understood that each straightening roll may be associated with a great plurality of support rollers arranged along its length.
  • FIG. 4 axially adjacent the support rollers 5 there may be arranged another series or column of support rollers 4, then again a column of rollers 5, etc.
  • adjacent support rollers 4 and 5 are held by their stub shafts in the side walls of forked carriers 6.
  • FIGS. 6 and 7 differs from the afore-described embodiment in that the forked carriers 7 hold narrow outer support rollers 8 which are arranged coaxially, while therebetween there are arranged wider support rollers 9, the axis of which is set off with respect to the axis of support rollers 8.
  • a first straightening roll (not shown) rests on a pair of support rollers 8 and an immediately adjacent second straightening roll (not shown) rests on a support roller pair 9.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
US00014342A 1967-10-27 1971-07-26 Apparatus for straightening metal strips Expired - Lifetime US3818739A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1400342 1967-10-27

Publications (1)

Publication Number Publication Date
US3818739A true US3818739A (en) 1974-06-25

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US00014342A Expired - Lifetime US3818739A (en) 1967-10-27 1971-07-26 Apparatus for straightening metal strips

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US (1) US3818739A (de)
AT (1) AT288113B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11389848B2 (en) * 2018-06-12 2022-07-19 Dalian Field Heavy-Machinery Manufacturing Co., Ltd Flattening device, conveying apparatus and processing system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3326026A (en) * 1963-08-01 1967-06-20 Loire Atel Forges Metal sheet and strip flattening apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3326026A (en) * 1963-08-01 1967-06-20 Loire Atel Forges Metal sheet and strip flattening apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11389848B2 (en) * 2018-06-12 2022-07-19 Dalian Field Heavy-Machinery Manufacturing Co., Ltd Flattening device, conveying apparatus and processing system

Also Published As

Publication number Publication date
AT288113B (de) 1971-02-25

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