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
  • B21B13/142—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 by axially shifting the rolls, e.g. rolls with tapered ends or with a curved contour for continuously-variable crown CVC
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
  • B21B27/02—Shape or construction of rolls
  • B21B27/021—Rolls for sheets or strips
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B2203/00—Auxiliary arrangements, devices or methods in combination with rolling mills or rolling methods
  • B21B2203/18—Rolls or rollers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B2267/00—Roll parameters
  • B21B2267/18—Roll crown; roll profile
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B2269/00—Roll bending or shifting
  • B21B2269/12—Axial shifting the rolls

Definitions

• the invention relates to a rolling mill for the production of rolled strip with work rolls, which are supported on backup rolls or intermediate rolls and backup rolls, wherein the
• Work rolls and / or intermediate rolls and / or back-up rolls are arranged in the rolling stand mutually axially displaceable and each roll at least one, from a back-up roll and a work roll, or from a back-up roll and a
• Intermediate roll formed roller pair, has a running over the entire effective bale length curved contour.
• 03/022470 AI known mill stand follows the bale contour of a trigonometric function.
• Such rollers are known in the art as SmartCrown®.
• the invention has for its object to provide a rolling mill, in which, especially when a wide rolled strip is produced and rolled under high load, the maximum pressures acting on the working and support roller are lower, so that increases roller life and roll breaks as possible can be avoided.
• the present invention is based on additionally forming a convex curvature on a support roll with a curved contour known per se, i. to deliberately increase the diameter of this roller in a central area.
• This additional curvature can be produced in such a way that an overlay function is superimposed on the roll grinding, starting from a first contour function running complementary to the adjacent work roll.
• Overlay function may be convex or concave with respect to the back-up roll axis, depending on whether it is subtracted or added.
• a convex curvature is formed in the middle of the support roller, so that it no longer comes to complementarily complement adjacent rollers in the unloaded state, but an increasingly larger gap is formed in the direction of the edge of the rollers. Nevertheless, the symmetry of the load distribution remains.
• a gap which widens outwards in the unloaded state to the adjacent roller is formed in the regions lying outside the middle. This further ensures that the effect of roll bending is enhanced.
• the profile and flatness of the rolled strip can be better controlled during production.
• a favorable embodiment may be characterized in that a concave overlay function is subtracted from the first contour function with respect to the support roller axis. When roller grinding this subtraction can be realized very easily.
• Support roller axis convex overlay function is added. Again, it comes in the bale center of the support roller to the desired thickening.
• Contour sections is formed, wherein the contour function is described by a trigonometric function.
• the first contour function is formed by a polynomial function.
• the superimposition function is formed by a symmetrical, with respect to the center of the bale, on both sides monotonous function.
• the overlay function can also by a
• Circular function or a power function be formed.
• the contour is according to the equations
• R L (x, c) R 0 -A * sin + B * xC * x 2
• the quadratic term C * x 2 causes a superposition of a parabolic contour with the above-mentioned, known from the prior art trigonometric SmartCrown® contour. If the coefficient C were zero, the two adjacent rolls complement each other again in the load-free, unshifted state.
• Figure 1 is a schematic representation of an upper portion of a four-high stand showing a contour of a back-up roll resulting from an overlay in which, from a first contouring function complementary to the adjacent work roll, one relative to the back-up roll axis subtracts a concave overlay function or a convex with respect to the support roller axis
• Figure 2 is a diagram in which a calculated
• FIG. 1 shows a schematic representation of the upper part of a four-high rolling stand with backup rolls according to the invention in an unloaded unbalanced state.
• the work rolls 1, 1 'and the support rollers 2, 2' show a bale contour, which is described by a trigonometric function. Starting from a first contour function 7, which is in a
• Contour function 10 of the support roller 2 characterized by the first contour function 7 with a superposition function 8 or 8 'superimposed.
• This overlay function 8 or 8 ' is shown in the illustration of Figure 1 in the diagram above.
• the overlay function 8 with respect to the support roller axis 9 is concave. According to the concave overlay function 8 of the first
• Contour function 7 subtracted. The result is the contour 5 of the support roller 2, which is drawn in broken lines in FIG. 1 and is described by the contour function 10.
• Overlay function 8 ' which according to another embodiment of the invention is added to the contour function 7).
• Bale center 4 This profile shape according to the invention can be easily taken from the graphic representation of FIG. Starting from the center of the bale 4, an increasingly larger gap between the support roller 2 and the work roll 1 forms on the left and on the right.
• FIG. 2 shows in a diagram a calculated load distribution between a work roll 1 and a support roll 2.
• the abscissa shows the position relative to the center of the roll stand, and the ordinate the force related to the length unit.
• the curve 11 shows the load distribution for the case of fully complementary roll grinding, the contour of the work roll and the support roll being described by a trigonometric function according to the known SmartCrown® technology.
• curve 12 shows the
• Contour function 10 went from a superposition of the known Trigonometric contour function 7 with a function, - in the present example a quadratic function -, forth. As can be seen clearly from FIG. 2, load transfer to the middle of the roller takes place.
• the graphical representation of the result of the calculation shows vividly that even with wide rolling stands with back-up rolls, which were intentionally cambered in the middle, load peaks can be reduced and, thanks to the invention, an equalization of the load distribution can be achieved.
• This equalization of the load distribution has the advantage that the roll life can be increased by the invention and the risk of cracking or even roll breaks is reduced.
• load distribution is not limited to the above-described four-high rolling stand, but also leads to the load distribution between intermediate rolls and

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Geometry (AREA)
• Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
• Rolls And Other Rotary Bodies (AREA)

Priority Applications (7)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (9)

Cited By (1)

Families Citing this family (3)

Citations (4)

Family Cites Families (11)

• 2009
  • 2009-12-10 AT AT0195509A patent/AT509107B1/de not_active IP Right Cessation
• 2010
  • 2010-11-04 US US13/515,069 patent/US9789521B2/en active Active
  • 2010-11-04 WO PCT/EP2010/066776 patent/WO2011069756A1/de active Application Filing
  • 2010-11-04 KR KR1020127017828A patent/KR101703531B1/ko active IP Right Grant
  • 2010-11-04 RU RU2012128853/02A patent/RU2550050C2/ru active
  • 2010-11-04 EP EP10775807.0A patent/EP2509723B1/de not_active Revoked
  • 2010-11-04 BR BR112012013980A patent/BR112012013980A2/pt not_active Application Discontinuation
  • 2010-11-04 IN IN5035DEN2012 patent/IN2012DN05035A/en unknown
  • 2010-11-04 CN CN201080055818.3A patent/CN102639261B/zh active Active

Patent Citations (5)

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