Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
  • B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
  • B21B13/145—Lateral support devices for rolls acting mainly in a direction parallel to the movement of the product
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
  • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
  • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
  • B21B13/04—Three-high arrangement
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
  • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
  • B21B2013/026—Quinto, five high-stands
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B2267/00—Roll parameters
  • B21B2267/02—Roll dimensions
  • B21B2267/06—Roll diameter
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B2267/00—Roll parameters
  • B21B2267/02—Roll dimensions
  • B21B2267/06—Roll diameter
  • B21B2267/065—Top and bottom roll have different diameters; Asymmetrical rolling
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B35/00—Drives for metal-rolling mills, e.g. hydraulic drives
  • B21B35/06—Drives for metal-rolling mills, e.g. hydraulic drives for non-continuously-operating mills or for single stands

Definitions

• the present invention relates to a roll stand for rolling metal strip and a rolling train with a plurality of roll stands according to the invention arranged one behind the other in the direction of material flow.
• the invention relates in particular to roll stands with an uneven number of rolls, more particularly with three, five or seven rolls.
• the upper or lower conventional work roll is replaced by a small work roll and an additional roll, either on the top or on the underside of the metal strip to be rolled.
• Such roll stands are known in principle in the prior art.
• Japanese patent application JP 2010075985 discloses a roll stand with five rolls, the upper work roll being particularly small, in particular smaller than the lower work roll.
• Providing the work roll with a smaller diameter offers the advantage that high-strength steels with high deformation resistance can be rolled more easily because the required rolling forces can be reduced due to the smaller work roll diameter.
• the Japanese patent application JP 61245904 A also discloses a roll stand with five rolls arranged one above the other, the upper work roll having a smaller diameter than the lower work roll.
• the Japanese patent application recommends this stand structure especially for asymmetrical rolling of clad steel plates.
• the clad steel plates have different deformation resistance on their top and bottom and it is therefore advisable to roll such steel plates with different peripheral speeds of the work rolls, as is done by the Work rolls with different diameters is realized at the same drive speed.
• a second upper work roll has the same diameter as a conventional work roll, ie the first and second work rolls taken together, when they are arranged one above the other, have a greater height than a single conventional work roll.
• the work roll with the smaller diameter is used on that side of the clad material to be rolled which has a greater deformation resistance; conversely, the work roll with the larger diameter starts at the side of the clad material, which has a lower deformation resistance.
• the work roll with the smaller diameter is arranged to be pivotable relative to the conventional work roll with the larger diameter;
• the smaller work roll can be pivoted away from the vertical line of force. That is to say, it can either be provided in the vertical force transmission direction or pivoted away, as required; in the latter case, the roll stand can be operated as a normal four-high stand, in which the two opposite work rolls each have the same diameter.
• the rolling stand disclosed in Japanese patent application JP 61245904 A offers expanded rolling possibilities.
• a change between the described two roll constellations not only requires the work roll with the smaller diameter to be swiveled in or out, but also a vertical movement of the two rolls arranged above the small work roll within the roll stand.
• EP 0 114 795 A discloses a traditional four-high roll stand with a total of four rolls arranged one above the other, ie two internal work rolls which span a roll gap and with an upper back-up roll arranged above the upper work roll and with a lower back-up roll arranged below the lower work roll.
• a horizontal hydraulic support device on both sides is provided, each with a support shell is pressed against the surface of one of the work rolls and a lubricant is pumped with the aid of a pumping device into an intermediate space between the support shell and the respective work roll.
• the disclosed horizontal support device serves in particular to increase the horizontal rigidity or stability of the stand as a whole, which is particularly advantageous when cold rolling thin strips with high deformation resistance.
• the invention is based on the object of developing a known roll stand with an uneven number of rolls arranged one above the other in such a way that the small work roll is effectively prevented from bending sideways.
• the roll stand according to the invention is characterized by a support device for the small work roll, acting at least on one side in the horizontal direction, and by an adjustment device for horizontally adjusting the support device against the small work roll.
• the support device preferably supports the small work roll not only on one, but on both sides.
• the small work roll is effectively prevented from bending sideways and the rigidity of the roll stand with the uneven number of rolls is increased overall. Due to the stability of the additional roll, which is arranged between the small work roll and the second backup roll or the second intermediate roll, the required performance of the support device for stabilizing the entire roll stand is lower compared to the work roll stabilization in a conventional roll stand with four or six one above the other arranged rolls, in which the two work rolls each have the same diameter.
• the term “work roll” is understood to mean a roll that is in direct contact with the rolling stock and that performs the forming work.
• the work roll referred to in the present application as the large work roll corresponds to a regular work roll typically used in practical use
• adjusting device means not only a preferably hydraulically operating device for the variable adjusting of the supporting device, in particular its supporting shells, against the small work roll, but also expressly a static, i.e. H. non-variable holding device for stationary positioning of the support device on the small work roll.
• the size ratios show that the small work roll has a smaller diameter than the additional roll and the additional roll has a smaller diameter than the large work roll.
• the roll stand according to the invention can alternatively be designed with or without backup rolls and / or intermediate rolls.
• a first back-up roll is provided to support the large work roll and a second back-up roll is provided to support the additional roll, both back-up rolls having a larger diameter than the large work roll.
• both back-up rolls having a larger diameter than the large work roll.
• the two back-up rollers have an identical diameter.
• a first intermediate roll arranged between the large work roll and the first support roll and a second intermediate roll arranged between the additional roll and the second support roll are provided, the first intermediate roll having a larger diameter than the large work roll and a smaller diameter compared to the first support roll and the second intermediate roll has a larger diameter than the auxiliary roll and a smaller diameter than the second backup roll.
• the two intermediate rollers have an identical diameter.
• the roll stand has only one drive device for driving the large work roll in rotation.
• the drive device can also drive the additional roller. In the case of the simultaneous drive of the large work roll and the additional roll, it must be ensured that the drive device drives the two rolls with the same directions of rotation and, if necessary, with an adapted speed.
• the roll stand has a drive device for driving the first support roller and / or the second support roller in rotation. In the case of the simultaneous drive of the first and the second support roller, it must be ensured that the drive device drives the two rollers with the same directions of rotation. In a further embodiment variant, the roll stand has a
• the drive device for rotating the first intermediate roller and / or the second intermediate roller.
• the drive device drives the two rollers with the same directions of rotation in each case.
• the small work roll and the additional roll are connected and rotatably mounted in an interchangeable insert.
• the support device has at least one support shell for pressing against the small work roll at least on one side, preferably on both sides. It is one
• the support device provided for pumping a fluid into an intermediate space between the at least one support shell and the small work roll.
• the support device is advantageously located within said exchange insert. This is space-saving and in particular also makes sense, because the support device is provided according to the invention only for the small work roll.
• the fluid pumped into the intermediate space which is preferably designed in the form of a cooling lubricant, serves as a hydrostatic cushion and also for effective cooling of the small work roll.
• the size of the gap, but also the stability of the horizontal support can be changed by setting the pressure value of the fluid and / or by means of its volume flow.
• the setting and regulation of pressure and / or volume flow is provided for setting an optimal horizontal support. Since the claimed replacement insert only relates to the small work roll and the additional roller, flatness actuators of all other rollers, that is to say the backup rollers and / or the intermediate rollers, can remain in function unchanged outside the replacement insert; this concerns z.
• the outer geometric dimensions in particular the total height of the replacement insert with the small work roll and the additional roll, at least partially correspond to the outer geometric dimensions, in particular the diameter of the opposite large work roll, or the diameter of a traditional two-high, four-high, or sexto framework largely corresponds.
• the invention can thus be implemented particularly easily in the context of modernizations. For new systems, deviations of up to 30%, preferably up to 20%, compared to the large work roll are permissible.
• the present invention can also be used to expand the rolling possibilities in single stands or tandem mills, in one-way or Reversing operation.
• effects on the structure due to the asymmetrical roll gap conditions must be taken into account.
• the effective effects on the structure of the metal strip to be rolled in the so-called drag drive result from the displacement of the flow separation layer between the driven and non-driven work roll.
• the setting of the horizontal offset of the small work roll via a shift / movement of the support shells and the offset of the entire insert or other rolls is set or regulated using a process model and / or taking necessary parameters, in particular measured ones, into account
• the roll stands according to the invention enable a higher rolling speed than the conventional roll stands, in particular also as known multi-roll stands; for example, rolling speeds of more than 800 m / min are possible.
• rolling speeds of more than 800 m / min are possible.
• the roll stands according to the invention are used in particular for cold rolling high-strength thin metal strips.
• the horizontal offsets of the small work roll and the additional roll of the replacement insert are set with the help of the pressure device so that the lateral forces on the support shells are set minimally or in a range that makes sense for the load.
• the measured motor currents can be used to calculate the horizontal forces. This is not completely possible with a comb roller drive due to unknown torque distortions.
• the replacement insert is arranged above the metal strip: Since the roller gap friction is usually lower due to the cooling lubricant pool on the upper side, the drive power is transmitted via the lower side with a reduced risk of slipping.
• roller gap friction can be reduced for the small, non-driven work roll by applying additional cooling lubricant, applying concentrate / additive or cooling lubricant with an enriched concentrate / additive component.
• the replacement insert can be integrated as a whole in a bending or axial / horizontal displacement system.
• FIG. 1 an embodiment variant of the roll stand according to the invention
• FIG. 2 shows different constellations of the roll stand according to the invention with an arrangement of the small work roll and the additional roll above the metal strip
• FIG. 3 shows different configurations of the roll stand according to the invention with an arrangement of the small work roll and the additional roll below the metal strip.
• FIG. 1 shows an embodiment variant for the roll stand 100 according to the invention for rolling metal strip 200
• the roll stand has a small work roll 110 and an additional roll 111 that is operatively connected to it, as well as a large work roll 120.
• the small work roll 110 and the large work roll 120 open a nip for rolling the metal strip 200.
• the additional roll 111 has a larger diameter than the small work roll 110, but a smaller diameter than that of the small roll 110 opposite arranged large work roll 120.
• the sum of the diameters of the small work roll 110 and the additional roll 111 - when arranged vertically one above the other - largely corresponds to the diameter of the large work roll 120 corresponds to both rollers 110, 111, in particular if these two are rotatably arranged in an exchange insert 130.
• the left half shows a conventional work roll 140 with its chock or bearing housing 141 the diameter of the opposite Work roll 120 and the conventional work roll 140 coincide.
• the small work roll 110 is supported on both sides in the horizontal direction with the aid of a horizontal support device 150 against horizontal or lateral bending.
• the support device 150 is adjusted against the small work roll 110 with the aid of a, for example, hydraulically operating adjustment device 160. More precisely, not the entire support device 150, but only its support shell 155 is placed against the small work roll 110.
• a pumping device 170 is provided for pumping fluid or cooling lubricant into the space 175 between the support shell 155 and the small work roll 110. This is preferably done, as shown in FIG. 1, on both sides of the small work roll 110.
• FIG. 2 shows, in partial images a) to i), various exemplary embodiments for the roll stand 100 according to the invention, in which the small work roll 110 supported by the additional roll 111 is arranged above the metal strip 200 to be rolled.
• the embodiment a) corresponds to the first embodiment described above with reference to FIG. It is characteristic of this exemplary embodiment that only the large work roll 120 arranged below the metal strip 200 is driven in rotation in accordance with the direction of rotation of the arrow. All other rolls of the roll stand 100 and in particular the small work roll 110 are not driven in rotation.
• the exemplary embodiments according to FIGS. 2c) to 2e) each relate to a roll stand with 5 rolls. Compared to the previous ones
• Exemplary embodiments these additionally comprise a first support roll 180 and a second support roll 185.
• the first support roll 180 is in operative connection with the large work roll 120 and has a larger diameter than it.
• the second support roller 185 is in operative connection with the additional roller 111 and has a larger diameter than it.
• the drive concept of exemplary embodiments 2c) and 2d) corresponds to that of exemplary embodiments 2a) and 2b).
• only the first support roller 180, or only the second support roller 185, or both the first and the second support roller 180, 185 can be driven in rotation simultaneously, according to the direction of rotation of the arrow.
• the exemplary embodiments according to FIGS. 2f) to 2i) each relate to a roll stand with 7 rolls. Compared to the previous exemplary embodiments according to 2c) to 2e), these additionally comprise a first intermediate roll 190 and a second intermediate roll 195.
• the first intermediate roll 190 is arranged between the first support roll 180 and the large work roll 120 and has one to the large work roll 120 larger diameter and a smaller diameter to the first backup roller 180.
• the second intermediate roller 195 is arranged between the second support roller 185 and the additional roller 111 and has a larger diameter than the additional roller 111 and a smaller diameter than the second support roller 185.
• the drive concept of the exemplary embodiments 2f) and 2g) corresponds to that of the exemplary embodiments 2a) to 2d).
• first support roller 180 or alternatively only the first intermediate roller 190, or only the second support roller 185 or alternatively only the second intermediate roller 195, or both the first and the second support roller 180, 185 or alternatively the first and the second intermediate roller 190, 195 are driven simultaneously in rotation in accordance with the direction of rotation of the arrow.
• FIG. 3 shows, in partial images a) to i), various exemplary embodiments for the roll stand 100 according to the invention, in which the small work roll 110 supported by the additional roll 111 is arranged below the metal strip 200 to be rolled.
• the statements made above with reference to FIG. 2 about the exemplary embodiments shown there apply equally or analogously to the exemplary embodiments according to FIG. 3

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Metal Rolling (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=74505254

Family Applications (1)

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Citations (6)

Family Cites Families (19)

• 2020
  • 2020-03-11 DE DE102020203076.6A patent/DE102020203076A1/de not_active Withdrawn
• 2021
  • 2021-02-01 CN CN202180020604.0A patent/CN115279506A/zh active Pending
  • 2021-02-01 EP EP21702984.2A patent/EP4117834B1/de active Active
  • 2021-02-01 JP JP2022554506A patent/JP7470201B2/ja active Active
  • 2021-02-01 WO PCT/EP2021/052254 patent/WO2021180395A1/de unknown

Patent Citations (6)

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