WO2022217718A1 - Procédé de laminage à tension uniforme - Google Patents

Procédé de laminage à tension uniforme Download PDF

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Publication number
WO2022217718A1
WO2022217718A1 PCT/CN2021/097721 CN2021097721W WO2022217718A1 WO 2022217718 A1 WO2022217718 A1 WO 2022217718A1 CN 2021097721 W CN2021097721 W CN 2021097721W WO 2022217718 A1 WO2022217718 A1 WO 2022217718A1
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WIPO (PCT)
Prior art keywords
foil
roll
tension
arc
rolling
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PCT/CN2021/097721
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English (en)
Chinese (zh)
Inventor
刘洪勤
马力
徐继玲
李毅
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上海五星铜业股份有限公司
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Publication of WO2022217718A1 publication Critical patent/WO2022217718A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/40—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling foils which present special problems, e.g. because of thinness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/48—Tension control; Compression control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/68—Camber or steering control for strip, sheets or plates, e.g. preventing meandering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/14—Guiding, positioning or aligning work
    • B21B39/16—Guiding, positioning or aligning work immediately before entering or after leaving the pass
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the invention relates to the technical field of rolling, in particular to a rolling method for eliminating the uneven distribution of unit tension of metal strips and foils within their width ranges and uniformly distributing the tension to metal strips and foils , to get a good shape.
  • strips and foils With the advancement of science and technology industry, the market demand for high-precision wide-width thin strips and foils (hereinafter referred to as strips and foils) is more and more urgent.
  • the rolling technology for wide and thick strips is basically mature, but the rolling technology of high-precision wide and thinner strips and foils has shown technical bottlenecks, which are in urgent need of breakthroughs.
  • the plate shape can still be corrected by tension leveling or other flattening means, while for thinner strip foils, especially very thin foils, due to the lack of follow-up
  • the original rolling shape is the final shape of the product.
  • the thinnest rolling thickness that can be achieved by mass production of pure copper foil is 0.006mm and the maximum width is 650mm.
  • the minimum rolling thickness that can be achieved by mass production of stainless steel foil is 0.02mm and the maximum width is 600mm.
  • the rolled shape is not very good, if the width continues to increase, the shape will become worse.
  • the three basic conditions for stable rolling of a rolling mill are roll accuracy, lubrication conditions and tension accuracy.
  • the reduction effect of the reduction amount is weakened, and the thickness reduction of the strip foil is basically achieved by the flattening rebound amount of the work roll, the rolling speed and the larger unit tension.
  • the tension selected for thicker strip rolling usually does not exceed 16% of the yield strength of the strip, so the effect of tension on strip thinning is not obvious, and its main role is to establish a stable rolling operation.
  • the very thin thickness of the strip foil rolling is quite different. In order to make full use of the thinning effect of the tension on the strip foil, the unit tension used even reaches 60% of the yield strength of the material.
  • the influence of the tension on the sheet shape is mainly manifested in the uniformity of the unit tension distribution within the wide range of the tension.
  • the roll pressure formula It can be seen that the fluctuation of the thickness of the region is accompanied by the lateral flow of the metal material (macroscopically manifested as abnormal plate shape), the lateral flow of the metal material causes the fluctuation of the rolling force P1 in the region, and the fluctuation of the rolling force P1 causes the The tension S1 fluctuates. Then, in turn, the fluctuation of the tension S1 in the area will lead to the fluctuation of the rolling force P1, and the fluctuation of the rolling force P1 will affect the lateral flow of the metal material, which are cause and effect. This shows that during the rolling process, the tension applied to the cross section of the strip foil is not uniform, and the non-uniformity of this tension is ubiquitous.
  • the pre-tension and post-tension have a great influence on the shape of the strip, which is recorded in the paper "The Influence of Tension on the Deformation of Cold-Rolled Strip", which is discussed in detail through a three-dimensional simulation system.
  • Increasing the front and rear tension limits the lateral flow of the metal, which can increase the thickness deformation of the strip and make the thickness of the section more uniform.
  • increasing the front tension and back tension has a greater effect on the shape of the tape foil.
  • the tension of the strip foil is uneven per unit width, and the deformation resistance, roll gap, and material thickness of the local rolling will be uneven, which will eventually lead to defects (including potential defects) in the rolled sheet shape, such as often in the rolling process. Waves, wrinkles appear.
  • this is the typical layout of the current strip foil rolling.
  • the strip foil 5 enters horizontally along the rolling center line 6 after passing through the lifting roller 4 and the flattening roller 3. in the roll gap. It can be seen from Figure 3 that before the belt foil 5 enters the roll gap, the section of the belt foil between the lower work roll 2 and the flattening roll 3 is always in a suspended state, which solves the problem of the tension on the cross section of the belt foil. Uneven distribution is crucial and directly affects the success or failure of high-precision wide strip foil rolling.
  • the high level error of the rolling center line 6 is required to be within 0.05mm/m.
  • the reason for such a high requirement is to ensure the stability of the neutral plane of the strip to achieve uniform mechanical properties of the strip.
  • this is difficult to achieve in actual production.
  • Factors such as the jitter of the lifting roll under the action of the oil cylinder, the roll diameter error of the flattening roll and the work roll, and the overhang of the strip will cause the neutral surface of the strip to deviate to a certain direction.
  • this deviation phenomenon is particularly serious for thin strip foils, and there is no better solution at present.
  • the present invention discloses a uniform rolling method, the purpose of which is to uniformly distribute the tension on the cross section of the strip foil, and uniformly distribute the tension to the metal strip foil. Zhang rolling.
  • a uniform rolling method is used for rolling metal strips and foils.
  • the metal strip foil is wrapped on the roll surface of a certain work roll to form a wrapping arc, and the metal strip foil is supported by the work roll. Distribute the tension evenly across the cross section of the cladding arc.
  • the metal strip foil is wrapped on the roll surface of the same or different work rolls to form the inlet side cladding arc and the outlet side cladding arc.
  • the cladding angle of the cladding arc is ⁇ , and 0° ⁇ 90°.
  • the cladding arc on the inlet side is obtained by changing the angle at which the metal strip foil enters the roll gap.
  • the angle at which the metal strip foil enters the roll gap is realized by adjusting the height of the adjustment roll on the inlet side.
  • the cladding arc on the outlet side is obtained by changing the angle of the metal strip foil coming out of the roll gap.
  • solution 1 or solution 2 the angle of the metal strip foil coming out of the roll gap is realized by adjusting the height of the adjustment roll on the outlet side.
  • the cladding angle of the cladding arc on the inlet side is equal to the cladding angle of the cladding arc on the outlet side.
  • the metal strip and foil is rolled back and forth through the work rolls in multiple passes, wherein the total number of rolling passes is an even number of times.
  • the cladding arc on the exit side and the cladding arc on the entrance side are obtained by tilting the centerlines of the upper and lower work rolls toward the exit side of the roll gap or toward the roll gap entry side.
  • the present invention has the following beneficial effects:
  • Example 1 It can be seen from Example 1 that the present invention makes the belt foil form a covering arc on the work roll at the entrance side of the roll gap, and through the back support of the belt foil by the work roll, the front tension is made on the cross section of the covering arc at the entrance side. It is evenly distributed, realizing the uniform rolling of the strip foil, breaking through the bottleneck restricting the development of the strip foil in the direction of wider, thinner and more ideal plate shape, and solving the technical problems that have been difficult to solve in the industry for a long time. Significant application value and economic value.
  • Example 2 It can be seen from Example 2 that the present invention forms a wrapping arc on the roll surface of the work roll with the foil at the exit side of the roll gap, and realizes the uniform distribution of the back tension on the wrapping arc on the exit side.
  • the generation of defects such as waves and wrinkles is eliminated, and then through the back support of the foil by the work rolls, the shape of the foil can be stabilized in the later stage of rolling, so as to obtain a better shape. .
  • the slip thinning of the present invention not only has the effect of extrusion thinning, but also has the effect of rolling thinning, and the neutral plane is stabilized at the middle layer of the foil, thereby ensuring the mechanical properties of the foil. uniformity.
  • the invention breaks through the strict requirements on the rolling center line in the national standard, realizes the stability of the neutral plane in a real engineering manner, and solves the technical problems that cannot be solved by the prior art, so it is creative.
  • the strip foil is not arranged horizontally along the rolling center line, which breaks the knowledge in the industry, which is creative in itself.
  • Figure 1 is a schematic diagram of the tension distribution applied to the cross section of the tape foil under ideal conditions.
  • Figure 2 is a schematic diagram of the tension distribution actually applied to the cross section of the tape foil.
  • Figure 3 shows a typical arrangement for current strip foil rolling.
  • FIG. 4 is a schematic structural diagram of the present invention in Embodiment 1.
  • FIG. 4 is a schematic structural diagram of the present invention in Embodiment 1.
  • Figure 5 is a schematic diagram of a belt drive.
  • Figure 6 is the force analysis diagram of a volume element on the cladding arc.
  • Figure 7 is the force analysis diagram of a volume unit when the foil is in the state of no backing.
  • Figure 8 is the force analysis diagram of a volume unit when the foil is in the state of backing.
  • FIG. 9 is a diagram showing the distribution of tension in the thickness direction of a certain volume unit on the cladding arc on the entrance side of the roll gap in Example 1.
  • FIG. 9 is a diagram showing the distribution of tension in the thickness direction of a certain volume unit on the cladding arc on the entrance side of the roll gap in Example 1.
  • Figure 10 is a flow velocity distribution diagram of the upper and lower layers of the belt foil in the calendering zone.
  • FIG. 11 is a schematic structural diagram of the present invention in Embodiment 2.
  • FIG. 11 is a schematic structural diagram of the present invention in Embodiment 2.
  • FIG. 12 is a diagram showing the distribution of tension in the thickness direction of a certain volume unit on the clad arc on the exit side of the roll gap in Example 2.
  • FIG. 12 is a diagram showing the distribution of tension in the thickness direction of a certain volume unit on the clad arc on the exit side of the roll gap in Example 2.
  • FIG. 13 is a schematic structural diagram of the present invention in Embodiment 3.
  • FIG. 13 is a schematic structural diagram of the present invention in Embodiment 3.
  • FIG. 14 is a diagram showing the distribution of tension in the thickness direction of a certain volume unit on the clad arc on the exit side of the roll gap in Example 3.
  • FIG. 14 is a diagram showing the distribution of tension in the thickness direction of a certain volume unit on the clad arc on the exit side of the roll gap in Example 3.
  • FIG. 15 is a schematic diagram of a conventional extrusion thinning rolling.
  • FIG. 16 is a schematic diagram of the principle of slip thinning.
  • FIG. 17 is a schematic structural diagram of the present invention in Embodiment 4.
  • FIG. 17 is a schematic structural diagram of the present invention in Embodiment 4.
  • FIG. 18 shows the inclined arrangement of the upper work rolls and the lower work rolls of the rolling mill in the fifth embodiment.
  • An equalizing rolling method is used for rolling copper alloy strips and foils.
  • the final rolling thickness of the copper alloy strips and foils is 0.05mm and the width is 1000mm.
  • the thickness of the boundary between the strip and the foil is 0.15mm, and the thickness of the copper alloy strip foil (hereinafter referred to as the strip foil) already belongs to the foil. Due to the large deformation resistance of copper alloys, it is difficult to ensure the flatness of the plate shape.
  • a flattening roller 3 is arranged on the entrance side of the roll gap, and the roll surface of the flattening roller 3 is lower than the rolling center line 6.
  • the strip foil 5 After the strip foil 5 is stretched forward by the flattening roller 3, it enters obliquely upward.
  • the strip foil 5 forms a certain angle with the rolling centerline 6 before entering the roll gap, the strip foil 5 forms an entry-side cladding arc on the roll surface of the lower work roll 2, and the entry-side cladding arc is covered The angle is ⁇ , and ⁇ is 30°. Due to the existence of the cladding arc on the inlet side, the lower work roll 2 backs up the belt foil 5, and the tension is evenly distributed on the cross section of the cladding arc on the inlet side.
  • the principle is as follows:
  • the driving pulley 7 drives the belt 8 to rotate clockwise.
  • Point A is the entry point of the belt 8 entering the driving pulley 7, and point B is the cutting point of the belt 8 from the driving pulley 7. point.
  • the strip foil 5 enters the roll gap from the left side, the neutral point P is in the rolling arc, and on the left side of the neutral point P, the line of the roll surface of the work roll
  • the speed is greater than the linear speed of the belt foil 5 entering the roll gap, which produces a speed difference and friction force F3, that is, the lower work roll 2 drives the belt foil 5 to rotate along the wrapping arc on the entry side, just like the belt 8 drives.
  • a volume element 9 is arbitrarily selected on the cladding arc on the inlet side. Due to the action of friction force F3, the proximal tension F2 acting on this volume element 9 is smaller than its distal tension F1.
  • the proximal tension and distal tension expressed here are Tension is relative to the distance from the roll gap.
  • the magnitude of the distal tension acting on this volume unit 9 is equal to F2, and the magnitude of its proximal tension is less than F2, and so on. From this, it can be concluded that the frictional force F3 increases cumulatively from point A (the starting point of the cladding arc on the inlet side) to point B (the end point of the cladding arc on the inlet side), correspondingly, the amount of the belt foil 5 on the volume unit 9 increases.
  • the proximal tension F2 received gradually decreases from point A to point B.
  • a volume unit 9 is arbitrarily selected on the tape foil 5 . Due to the unevenness of tension, the tension on both sides of the volume unit 9C and D is greater than the tension in the middle E part, and the E part rises to form ripples.
  • the proximal tension F2 is equal to the distal tension F1.
  • the volume unit 9 shrinks inward in the width direction, and its internal force F4 is negative.
  • the lower work roll 2 applies a backing force T to it, so that the volume unit 9 is bent and deformed.
  • the internal force F4 acting on the width direction of the volume unit 9 changes from negative to positive and gradually increases.
  • the increase of the internal force F4 causes the volume unit 9 to expand outward in the width direction, just like a loose elastic band widens in the width direction, thereby flattening the corrugated portion of the belt foil 5 .
  • the proximal tension acting on the two sides of the volume unit 9C and D is rapidly reduced, and the two sides of C and D are extended outward in the width direction, so that the middle E part is in contact with the roll surface of the lower work roll 2 .
  • the proximal tension of the middle part of the volume unit 9 is correspondingly increased, thereby realizing the uniform distribution of the proximal tension F2 on the cross section of the volume unit 9 .
  • the proximal tension F2 in the roll gap calendering zone is the pre-rolling tension, where the pre-tension is the smallest, and the pre-tension distributed on the cross-section here is the most uniform.
  • the larger the cladding angle of the cladding arc on the inlet side the smaller the front tension in the calendering area of the roll gap, and the more uniform the front tension is distributed.
  • a larger front tension is beneficial to the control of the plate shape.
  • the existence of the cladding arc on the entrance side makes the front tension evenly distributed on the cross section of the strip foil 5, but part of the front tension is lost, so it is necessary to roll
  • the take-off or flattening roll 3 adds a suitable front tension to the belt foil 5 to compensate for the loss.
  • the tension at the front end of the cladding arc on the inlet side can be increased to 50-60% of the yield strength of the material, and the strip foil 5 can be thinned by taking full advantage of the thinning effect of the tension on the strip foil 5 .
  • the rolling process of the strip foil 5 by the work rolls can be regarded as the repeated thinning and widening process of the strip foil 5.
  • the coiler and the flattening roll 3 can be regarded as a process of repeated stretching and narrowing of the tape foil 5, so appropriately increasing the front tension of the tape foil 5 is more conducive to the thinning of the tape foil 5 and the control of the plate shape.
  • proximal tension F2 changes in a gradient in the thickness direction.
  • the side of the cladding arc on the entrance side that is in contact with the lower work roll 2 has a small tension and is far from the side of the lower work roll 2. , its tension is large, which compensates the loss of front tension to a certain extent, especially for thicker strips, the compensation effect is more obvious.
  • the belt foil 5 when the belt foil 5 enters the calendering area of the roll gap, the belt foil 5 is squeezed by the work rolls and begins to deform. Due to the existence of the cladding arc on the entrance side, the deformation of the upper layer of the belt foil 5 is greater than that of the lower layer. , the linear velocity of the particle at the neutral point P of the upper plate surface is consistent with the linear velocity of the upper work roll 1 roll surface, while the lower plate surface lags, and the linear velocity of the particle at the point E is the same as that of the lower work roll 2 roll surface.
  • the outflow speed of the upper layer of the belt foil 5 is greater than the outflow speed of the lower layer of the belt foil 5, and the belt foil 5 is curled down to the side of the work roll 2, which indicates that there is a delamination phenomenon in the calendering area.
  • the delamination phenomenon causes the neutral surface of the tape foil 5 to deviate to the lower layer, and causes the tape foil 5 to curl and deform.
  • the curling deformation is more obvious on strips with larger plate thickness, but it is not obvious on foils with a thickness of less than 0.15mm, which can be corrected by subsequent processes such as flattening and straightening. For strips with larger plate thickness, the elimination of layer shift can be solved by increasing the roll diameter of the lower work roll 2.
  • the offset of the neutral plane will cause uneven mechanical properties of the foil. It can be seen from the background technology that it is difficult to achieve the stability of the neutral plane in actual production. Since it is difficult to achieve, there is no need to comply with the national standard. requirements to specify the way the strip foil enters the roll gap. For some application fields, the requirements for the mechanical properties of the foil are not high, such as the use of copper foil for electrical conduction, or for decoration, anti-corrosion, etc., it is absolutely unnecessary to make the uniformity of the mechanical properties of the foil too high. requirements. Therefore, in the present invention, the strip foil 5 does not enter the roll gap horizontally along the rolling center line 6, which itself has broken the knowledge in the industry, and thus is creative.
  • Example 1 It can be seen from Example 1 that the present invention makes the belt foil 5 form an entrance side covering arc on the lower work roll 2 at the entrance side of the roll gap, and through the back support of the belt foil 5 by the lower work roll 2, the tension is wrapped on the entrance side.
  • the cross-section of the covered arc is evenly distributed, which realizes the uniform rolling of the strip foil 5, breaks through the bottleneck restricting the development of the strip foil 5 in the direction of wider, thinner and more ideal shape, and solves the problem in the industry for a long time. It is a difficult technical problem to solve, so it has great application value and economic value.
  • the tape foil 5 to form the entry-side cladding arc on the lower work roll 2 is not limited to the flattening roll 3, but also includes all entry-side adjustment rolls, such as S rolls, hi-low rolls, or a combination thereof. As long as the adjustment roll on the entrance side closest to the roll gap is adjusted so that the strip foil 5 forms a certain angle with the rolling center line 6 before entering the roll gap, the strip foil 5 can form the entry-side coating on the lower work roll 2 arc.
  • the entry-side cladding arc is formed on the lower work roll 2 . Based on the same reason, the entry-side cladding arc may also be formed on the upper work roll 1 .
  • the strip foil 5 enters the roll gap horizontally along the rolling center line 6 , and a flattening roll 3 is arranged on the exit side of the roll gap.
  • the roll surface of the flattening roll 3 is higher than the rolling surface. centerline 6.
  • the flattening roll 3 back-stretches the tape foil 5 so that the tape foil 5 forms an exit-side cladding arc on the roll surface of the upper work roll 1. Due to the existence of the cladding arc on the outlet side, the upper work roll 1 produces a back support for the belt foil 5, and the tension is evenly distributed on the cross section of the cladding arc on the outlet side.
  • the principle is as follows:
  • the belt foil 5 flowing out from the roll gap is wrapped around the upper work roll 1 to form a wrapping arc on the exit side. Since the linear velocity V of the belt foil 5 flowing out is greater than the linear velocity of the roll surface of the upper work roll 1, the upper work roll 1 generates a reverse friction force F4 on any volume unit 9 on the cladding arc on the exit side, and the volume unit 9 also generates a reverse friction force F4. There is a proximal tension F5 and a distal tension F6. According to the description in Embodiment 1, the friction force F4 increases gradually from point M to point N, and similarly, the distal tension F6 also increases accordingly.
  • the distal tension F6 reaches the maximum at the N point, and the distal tension F6 here is the post tension.
  • the post tension can not only prevent the strip foil 5 from deviating, but also can reduce the rolling pressure and facilitate the high-speed rolling of the strip foil 5 .
  • the belt foil 5 flows out of the roll gap, its outflow linear velocity is greater than the linear velocity of the roll surface of the work roll, so the belt foil 5 can be understood as a belt, and the upper work roll 1 can be understood as a driven pulley, then, the belt foil 5 Drive the upper work roll 1 to rotate, just like the belt drives the driven pulley to rotate, the larger the cladding arc on the outlet side, the greater the transmission torque, thus reducing the torque of the upper work roll 1 and reducing the energy consumption of the main motor .
  • the back tension is the smallest at the exit of the roll gap, and the cross section here is The post tension distribution is also the most uniform, which is important for the control of the strip shape. It can be seen from the discussion in the background art that only when the tension is evenly distributed on the cross section of the belt foil can the defects such as waves and wrinkles appear in the plate shape. The uniform distribution of tension at the exit of the roll gap is realized, and the generation of defects such as waves and wrinkles can be eliminated at the early stage of rolling with foil, so that a better plate shape can be obtained.
  • the distal tension F6 acting on the cross section of the volume unit 9 gradually increases, and the uneven tension trend becomes obvious.
  • the foil 5 is no longer suspended and shakes, and the plate shape is stabilized during the critical forming period of foil rolling, thereby preventing defects such as waves and wrinkles due to uneven tension of the plate shape.
  • Example 2 it can be seen from Example 2 that in the present invention, at the exit side of the roll gap, the belt foil 5 forms an exit side cladding arc on the roll surface of the upper work roll 1, and realizes the uniformity of the back tension on the exit side cladding arc on the exit side. distribution, the generation of defects such as waves and wrinkles is eliminated at the critical early stage of strip foil rolling, and then through the back support of the strip foil 5 by the upper work roll 1, the plate shape of the strip foil 5 is formed in the rolling process. It can be stabilized in the later stage, so as to obtain a better plate shape. In addition, the torque of the upper work roll 1 is reduced, reducing the energy consumption of the rolling mill.
  • what causes the belt foil 5 to form the exit-side cladding arc on the upper work roll 1 is not limited to the flattening roll 3, but also includes all exit-side adjusting rolls, such as S rolls, hi-low rolls, or a combination thereof .
  • the strip foil 5 can be formed on the upper work roll 1 to form an exit side wrap.
  • the cladding arc on the outlet side is formed on the upper work roll 1 , and based on the same reason, the cladding arc on the outlet side can also be formed on the lower work roll 2 .
  • the belt foil 5 forms an entrance side covering arc with the lower work roll 2 at the entrance side of the roll gap, and the covering angle ⁇ of the entrance side covering arc is 30°; the belt foil 5 On the exit side of the roll gap, an exit-side cladding arc is formed with the upper work roll 1, and the cladding angle ⁇ of the exit-side cladding arc is also 30°. Due to the existence of the cladding arc on the inlet side and the cladding arc on the outlet side, the lower work roll 2 and the upper work roll 1 are respectively back-supported to the belt foil 5 .
  • the strip foil 5 In the production of the strip foil 5, it is necessary to repeatedly roll the strip foil 5 for multiple passes. Due to the phenomenon of delamination, after each pass of rolling, the unidirectional curling deformation of the strip foil 5 will occur. Although the upper work roll 1 can reversely straighten the curling deformation, it is not enough to completely eliminate the curling deformation, so the rolling method needs to be improved.
  • the neutral plane of the strip foil 5 deviates from a certain side, then the second pass of rolling makes a reverse correction to the deviated neutral plane. After rolling with an even number of passes, the neutral plane is stabilized at the middle portion of the strip foil 5 , thereby ensuring the uniformity of the mechanical properties of the strip foil 5 .
  • the strict requirements for the rolling center line 6 in the national standard are bypassed, and the stability of the neutral plane of the strip foil 5 is realized in a real engineering manner, which solves the problems that cannot be solved in the prior art and Embodiment 1. technical difficulties.
  • the thinning process can be regarded as extrusion, just like squeezing toothpaste.
  • the speed of the belt foil 5 flowing out of the roll gap has a speed difference
  • the thinning process of the belt foil 5 is more like the reverse rolling of the upper and lower layers of the belt foil 5, just like rolling with a rolling pin. cake.
  • the upper and lower layers of the belt foil 5 are not only squeezed by the roll gap, but also subjected to a relative tensile force, so that the upper and lower layers of the belt foil 5 are compressed. slip, ultimately reducing the thickness.
  • This sliding thinning has the effect of extrusion thinning and rolling thinning. Compared with the traditional extrusion thinning, the plate shape is better and it is easier to control the plate shape.
  • Example 3 It can be seen from Example 3 that the present invention not only solves the problem of curling and deformation of the tape foil 5, but also solves the problem that the bright surface of the tape foil 5 is different. It is particularly important that the slip thinning of the present invention not only has the effect of extrusion thinning, but also has the effect of rolling thinning, and the neutral plane is stabilized at the middle layer of the belt foil 5, thereby ensuring the belt foil 5. uniformity of mechanical properties. The invention breaks through the strict requirements on the rolling center line in the national standard, realizes the stability of the neutral plane in a real engineering manner, and solves the technical problems that cannot be solved by the prior art, so it is creative.
  • Example 3 the cladding arc on the outlet side reduces the torque of the upper work roll 1, but the cladding arc on the inlet side increases the torque of the lower work roll 2, resulting in the difference in the driving torque of the upper and lower work rolls, which will increase the torque of the upper and lower work rolls.
  • the overall energy consumption of the large rolling mill continue to improve technical solutions:
  • the present embodiment differs from Embodiment 3 in that both the entry-side cladding arc and the exit-side cladding arc are formed on the lower work roll 2 .
  • the cladding arc on the inlet side increases the torque of the lower work roll 2
  • the cladding arc on the outlet side reduces the torque of the lower work roll 2. Therefore, the driving torque applied to the lower work roll 2 is not as a whole. Change.
  • the disadvantage of this construction is that, due to the superposition effect, the unidirectional crimping deformation of the tape foil 5 is greater than in the above-described embodiment.
  • the solution is to turn over the strip foil 5 before each pass of rolling, and then enter the roll gap for rolling, so as to eliminate the curling deformation of the strip foil 5 during the previous pass of rolling. Likewise, the total number of rolling passes of the strip foil 5 is set to an even number.
  • Example 1 the entry-side cladding arc is obtained by changing the angle at which the belt foil 5 enters the roll gap.
  • the exit-side cladding arc was obtained by changing the angle of the belt foil 5 coming out of the roll gap.
  • Example 3 the cladding arc on the inlet side is obtained by changing the angle of the belt foil 5 entering the roll gap, and the cladding arc on the outlet side is obtained by changing the angle of the belt foil 5 coming out of the roll gap.
  • the belt foil 5 forms the cladding arc on the inlet side and the cladding arc on the outlet side on different work rolls, which can also be realized by the following methods.
  • the exit-side cladding arc and the entry-side cladding arc are obtained by inclining the centerlines of the upper and lower work rolls toward the exit side of the roll gap.
  • the belt foil 5 enters the roll gap horizontally, and then comes out of the roll gap horizontally.
  • the upper work roll 1 presses the lower work roll 2 obliquely, so that the belt foil 5 and the lower work roll 2 form a covering arc on the entrance side, and the upper work roll 2 forms a covering arc on the entrance side.
  • the roll 1 forms an exit-side cladding arc.
  • the existing rolling mill can also be installed obliquely to achieve the same implementation effect.

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

Abstract

Procédé de laminage à tension uniforme, comprenant les étapes suivantes : une feuille de bande (5) formant un arc d'enveloppement sur un cylindre de travail sur un côté d'admission d'un espace de cylindre, et la tension avant est uniformément répartie sur la section transversale de l'arc d'enveloppement sur le côté d'admission au moyen d'un support arrière du cylindre de travail sur la feuille de bande, de telle sorte qu'un laminage à tension uniforme de la feuille de bande est obtenu. La feuille de bande forme l'arc d'enveloppement sur une surface de cylindre du cylindre de travail sur un côté de sortie de l'espace de cylindre, de telle sorte qu'une distribution uniforme de la tension de retour sur l'arc d'enveloppement sur le côté de sortie est obtenue, la génération de défauts tels que des ondes et des rides dans l'étape de formation initiale de laminage de feuille de bande est éliminée, ce qui permet d'obtenir de meilleures formes de bande, ce qui permet d'obtenir la stabilité d'une surface neutre de feuille de bande, garantissant ainsi l'uniformité des propriétés mécaniques de la feuille de bande.
PCT/CN2021/097721 2021-04-16 2021-06-01 Procédé de laminage à tension uniforme WO2022217718A1 (fr)

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