Classifications

• • 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
  • B21B—ROLLING OF METAL
  • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
  • B21B2015/0071—Levelling the rolled product

Definitions

• the present invention relates to a planer without traction for gluing metal strips, and the planing method using said planer.
• a metal strip or plate undergoes various operations, such as hot rolling and cold rolling, to impart consistent dimensional characteristics along its length; thus a laminated metal strip theoretically possesses at all points a constant thickness and width.
• the rolling operation is not sufficient to obtain a band free of defects. Indeed, it may have non-developable flatness defects such as corrugations at the banks or the center, and / or developable defects such as a hanger or a tile, ie a curvature respectively depending on the length, depending on the width of the band. These flatness defects can be corrected by planing the web in a roller planer.
• Such a planer consists of two superimposed cassettes each supporting several motorized rollers of constant diameter, offset relative to each other, and arranged alternately above and below the path of the strip.
• This type of planer is configured, in terms of number of rollers, roll diameter, center distance and adjustment, so as to satisfactorily plan strips whose thickness is within a defined range.
• the centers between the rollers are constant and are adjusted so that the ratio of roll diameter to center distance is from about 0.90 to about 0.95.
• efforts and planing couples are important. In order to reduce them, the manufacturers have developed planers in which all the distances are increased so that the ratio between the diameter and the center distance is of the order of 0.70 to 0.80.
• the present invention therefore aims to provide a planer in which the efforts and the planing torque are reduced compared to those of a conventional planer, while maintaining a good correction of flatness over the entire range of the planer, and by facilitating the control of the hanger and the tile.
• the planer according to the invention may furthermore have the following characteristics: n ⁇ 8, - when the thickness of the strip to be hovered is between 0.5 and 3 mm, 14 ⁇ n ⁇ 22, - when the thickness of the glide strip is between 3 and 15 mm, 10 ⁇ n ⁇ 16, for k: 1 to x, 0.90 ⁇ R / Ek ⁇ 0.95, and for k: (x + 1) to n, 0.70 ⁇ R / Ek ⁇ 0.80.
• the subject of the invention is also a method for flattening a metal strip, in particular a steel strip, in which this planer is used with a plasticization ratio greater than or equal to 60% and less than or equal to 90%.
• the invention consists in proposing a planing machine in which at least the first five rollers from the entry of the planer have a center to center ratio identical to that of conventional planers, at least the last five rollers from the entrance of the planer have a center-to-spoke ratio close to that of a stripper, and wherein the distance between the intermediate rollers of the planer is advantageously increased.
• FIG. 1 shows a diagrammatic cross-sectional view of a multi-roll planer without traction according to the invention
• FIG. 2 shows a design curve of the residual hanger of a flat metal strip, as a function of the output clamping force of the planer, for a plasticization ratio of 60%
• FIG. 3 shows a curve for calculating the residual hanger of a flat metal strip, as a function of the output clamping force of the leveler, for a plasticization ratio of 80%.
• FIG. 1 diagrammatically shows a planer 1 comprising two superimposed cassettes 2.3 and supporting each of the motorized rollers 4,4 'of constant radius R.
• each cassette 2,3 must support at least n / 2 rolls 4,4 'and more precisely for a planer 1 having n + 1 rollers 4,4' the lower cassette 2 has (n / 2 ) +1 rolls 4 and the upper cassette 3 has n / 2 rolls 4 '.
• each of the rollers 4,4 'of a given cassette 2,3 is separated from the axis of the roll 4,4' immediately successive of the other cassette by a distance Ek which can be variable.
• Ek which can be variable.
• the inventors have demonstrated that a reduction in the ratio of radius on the center distance between the rollers to a value of about 0.8, starting from the fifth roll from the entry of the planer, in a planer whose ratio radius on center distance between at least the first five rollers from the entry of the planer corresponded to the ratio radius on the center distance of a conventional planer, efforts and planing pairs could be reduced by 5 to 25% depending on the type of adjustment made.
• the ratio R / Ek is equal to the ratio R / E1, in which E1 corresponds to the center distance between the first roll from the planer entry and the second roll from the planer entry, R / E1 being between 0.90 and 0.95, included terminals, values which correspond to the ratio radius on center distance of a conventional planer.
• the ratio R / Ek is equal to the ratio R / En, in which En corresponds to center distance between the last roll from the planer inlet and the first-to-last roll from the planer inlet, R / F being between 0.70 and 0.80, including correspond to the ratio of radius to center distance of a conventional stripper.
• the ratio R / E1 is always greater than the ratio R / En.
• the inventors have found an increase in the number of operating points using a planer according to the invention, compared to a conventional planer having the same number of rollers.
• the number of operating points of a planer is determined by the adjustment to be made on the planer to obtain, at the output of the planer, a band having a zero hanger and a null tile.
• the greater the number of operating points for a given leveler the lower the stress at the settings. This represents an additional advantage because the duration of the adjustment of the planer according to the invention will be reduced.
• the ratio R / Ek is equal to the ratio R / E1, to the accuracy near the adjustments of distance between the rollers, for at least the five first rolls from the entrance of the planer.
• the planer comprises more than nine rolls, that is to say n greater than or equal to 8, to allow good correction of both defects not developable as developable defects. Indeed, under nine rollers, it becomes difficult to control the developable defects, and the sheet can retain a tile and a hanger residual.
• the planer comprises between 15 and 23 (inclusive), that is to say 14 ⁇ n ⁇ 22.
• the planer advantageously comprises between 11 and 17 rolls, that is to say 10 ⁇ n ⁇ 16.
• the planer is divided into two zones.
• a first zone is thus between the first roll from the entry of the planer and the roll (x + 1) from the entry of the planer, that is to say when k varies from to x, and extends at least up to the fifth roll from the entrance of the planer.
• the ratio radius on center distance R / Ek is constant and between 0.90 and 0.95 (inclusive).
• the second zone is between the roll (x + 1) from the input of the leveler and the last roll from the input of the leveler which is the roll (n + 1), ie when k varies from (x + 1) to n, and starts at least from roll n-3 from the input of the planer.
• the radius-to-center ratio R / Ek is constant and lies between 0.70 and 0.80 (including terminals).
• the planer is divided into three zones.
• a first zone is comprised, as in the first embodiment, between the first roller from the entrance of the planer and the roller (x + 1) from the entrance of the planer, ie when k varies from 1 to x, and extends at least to the fifth roll from the entrance of the planer.
• the ratio radius on center distance R / Ek is constant and between 0.90 and 0.95 (limits included).
• a second zone in which one of the reports radius on center distance, which will be called R / Ex is between 0.80 and 0.90 (inclusive).
• This second area is between the fifth roll from the planer entry and the roll (n-4) from the planer entry, ie when x varies from 5 to (n- 4).
• a third area is located between the roll (x + 1) from the input and the last roll of the planer (roll (n + 1)), ie when k varies from (x + 1) ) to n.
• the radius-to-center ratio R / Ek is constant and lies between 0.70 and 0.80 (inclusive).
• the planer is also divided into three zones.
• a first zone is understood, as in the previous embodiments, between the first roll from the entry of the planer and the roll (x + 1) from the entry of the planer, ie when k varies from 1 to x, and extends at least to the fifth roll from the entrance of the planer.
• the radius-to-center ratio R / Ek is between 0.90 and 0.95 (including terminals).
• This second area is between the fifth roll from the planer entry and the roll (n-4) from the planer entry, ie when x varies from 5 to (n- 4).
• a third zone is located between the roll (x + 2) from the planer entry and the last roll of the planer (roll (n + 1)), ie when k varies from (x +2) to n.
• the radius-to-center ratio R / Ek is constant and lies between 0.70 and 0.80 (inclusive).
• the invention also relates to a method for gliding a metal strip in which one of the planers described above is used with a plastification rate equal to or greater than 60% and equal to or less than 90%.
• the plasticization rate of a metal strip is defined as the thickness of the plasticized metal strip over the total thickness.
• the metal strip to be hovered may be steel, ordinary or stainless, coated with a metal coating for example based on zinc or an organic coating.
• a conventional leveling machine designated by X planer, comprising (k + 1) rolls with k equal to 16, or seventeen rolls, diameter 57 mm and constant center distance Ek 30 mm (BRONX type planer), thus having a ratio radius on constant center distance R / Ek of 0.95, has been modi1.ee to obtain different planers according to the invention, namely:
• FIGS. 2 and 3 show a calculation curve of the residual hanger of the flat steel strip, as a function of the output clamping force of the leveler, for a plasticization rate of 60% (FIG. 2) and a plasticizing rate of 80% ( Figure 3).
• the different planers are marked by the. following symbols: - leveler A: symbol u, - leveler B: reference A, - leveler C: symbol X, and - planer X: symbol *.
• Table 1 gain on forces and torque and number of operating points, at 60% plasticization rate
• the planeuse A is the planeuse which makes it possible to obtain the biggest gains in effort and couple, and whatever the rate of plasticization.
• this planer is not necessarily the most reliable if it is desired to give the sheet a perfectly zero hanger, since, especially when the rate of plasticization is 60 %, the number of operating points is 1, while it is 9 for the leveler C.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Straightening Metal Sheet-Like Bodies (AREA)
• Pinball Game Machines (AREA)
• Feeding And Guiding Record Carriers (AREA)
• Treatment Of Fiber Materials (AREA)
• Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
• Rolling Contact Bearings (AREA)
• Vehicle Body Suspensions (AREA)
• Valve Device For Special Equipments (AREA)
• Finger-Pressure Massage (AREA)
• Heat Treatments In General, Especially Conveying And Cooling (AREA)
• Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
• Control Of Motors That Do Not Use Commutators (AREA)
• Heat Treatment Of Strip Materials And Filament Materials (AREA)
• Earth Drilling (AREA)
• Soil Working Implements (AREA)

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Publications (2)

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• 2004
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• 2006
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