CN111621636B - Furnace roller of continuous annealing furnace - Google Patents

Furnace roller of continuous annealing furnace Download PDF

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Publication number
CN111621636B
CN111621636B CN201910147038.4A CN201910147038A CN111621636B CN 111621636 B CN111621636 B CN 111621636B CN 201910147038 A CN201910147038 A CN 201910147038A CN 111621636 B CN111621636 B CN 111621636B
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taper
continuous annealing
furnace roller
section
annealing furnace
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CN111621636A (en
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王鲁
顾成勇
强晓彬
张春青
何建锋
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BAOSTEEL-NSC ARCELOR AUTOMOTIVE STEEL SHEETS CO LTD
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BAOSTEEL-NSC ARCELOR AUTOMOTIVE STEEL SHEETS CO LTD
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/562—Details
    • C21D9/563—Rolls; Drums; Roll arrangements
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

The invention discloses a furnace roller of a continuous annealing furnace, which is arranged as a double-taper roller, and the double-taper roller comprises: the device comprises a straight section positioned in the middle, first taper sections which are arranged on two sides of the straight section in an adjacent mode along the axial direction, and second taper sections which are arranged in an adjacent mode to each first taper section, wherein the second taper sections are different from the first taper sections in taper; a first transition circular arc is arranged between the straight section and the first taper section, and a second transition circular arc is arranged between the first taper section and the second taper section. The furnace roller of the continuous annealing furnace overcomes the defects in the prior art by the structural design of double tapers, avoids the occurrence rate of transverse scratches of strip steel in the production process, and improves the production efficiency of the strip steel and the quality of the obtained strip steel products.

Description

Furnace roller of continuous annealing furnace
Technical Field
The invention relates to a furnace roller, in particular to a furnace roller of an annealing furnace.
Background
The continuous annealing unit is an important link of cold-rolled strip steel production, has the advantages of short flow, high yield, good product quality and the like, and is indispensable annealing heat treatment equipment for strip steel production with thin thickness and high surface quality requirement.
In a large vertical furnace, strip steel needs to run quickly in order to increase the yield, and in order to reduce the deviation of the strip steel, the roller surface of a furnace roller in a heating section is generally designed into a double-taper roller shape with a high middle part and low two ends so as to generate a centripetal force and automatically correct the deviation of the strip steel. However, the strip steel is very soft in a high-temperature environment, if deviation occurs in the strip steel passing process, a self-deviation effect can be generated under the action of the convexity effect of the furnace roller, so that the strip steel can be transversely contused at the boss position of the furnace roller in the transverse sliding process on the surface of the furnace roller, and the surface quality of the strip steel is seriously influenced.
The above problems are particularly evident when producing automotive panels, however, the current prior art can only reduce the incidence of lateral scratches by downspeed production.
Based on this, it is expected to obtain a continuous annealing furnace roller, this continuous annealing furnace roller can overcome prior art's not enough, is difficult for producing the boss seal, solves the problem that easily takes place horizontal contusion among the prior art.
Disclosure of Invention
The invention aims to provide a furnace roller of a continuous annealing furnace, which overcomes the defects in the prior art by the structural design of double conicity, avoids the occurrence rate of transverse scratches of strip steel in the production process, and improves the production efficiency of the strip steel and the quality of the obtained strip steel products.
In order to achieve the above object, the present invention provides a continuous annealing furnace roll which is provided as a double taper roll including: the device comprises a straight section positioned in the middle, first taper sections which are arranged on two sides of the straight section in an adjacent mode along the axial direction, and second taper sections which are arranged in an adjacent mode to each first taper section, wherein the second taper sections are different from the first taper sections in taper; a first transition circular arc is arranged between the straight section and the first taper section, and a second transition circular arc is arranged between the first taper section and the second taper section.
In the technical scheme of the invention, through a large amount of experimental researches, the inventor finds that the continuous annealing furnace roller is provided with the first taper section and the second taper section, so that the continuous annealing furnace roller can obtain better through plate speed and prevent buckling and deflection, and the first taper section and the second taper section are designed to have two different tapers, so that the problem of transverse scratch to strip steel in the prior art can be solved, and the strip steel can be prevented from being indented. The design of the first taper section and the second taper section can be adjusted according to the specific situation of the implemented implementation mode, for example, the design can be selected according to the diameter of the furnace roller, the temperature of the furnace roller and the temperature of strip steel, so that better speed of the through plate is obtained, and buckling and deflection are prevented.
Further, in the furnace roller of a continuous annealing furnace of the present invention, the radius r of the first transition arc1And the radius r of the second transition arc2Obtained based on the following models, respectively:
r1＝2×X1/θ1
r2＝2×X2/(θ1-θ2)
X1＝X2＝k×D0
wherein D is0Is the diameter of the straight section, k is a coefficient; theta1And theta2Respectively, the taper angle of the first taper section and the taper angle of the second taper section.
Furthermore, in the continuous annealing furnace roller, the value of the coefficient k is 0.05-0.07.
This is because: the larger the k value, X1，X2The larger the value r1、r2The larger, X is from the viewpoint of reduction in the imprint on the boss1，X2The larger the value r1、r2The larger the size, the more advantageous, since r1、r2The radian needs to be specially polished by a grinding wheel, so that the roughness is very low after polishing the radian part, and X is1，X2The value increases. However, when the k value is too large and exceeds 0.7, the remaining length of the straight section is too short, so that the original roughness can only be kept at a low percentage of the original step width (for example, the remaining length of the straight section is 300mm, k is 0.725, the remaining length of the straight section is only 184mm, and the original roughness of the straight section is only 60% of the original step width), which can reduce the friction force on the surface of the strip steel furnace roller and facilitate deviation.
And the smaller the k value, X1、X2The smaller the value r 1、r2The smaller the influence on the roll surface roughness, but the curvature r1、r2Too small, a raised impression results. Based on this, the value range of the coefficient k is preferably limited to 0.05 to 0.07.
Further, the continuous annealing furnace roller according to the present invention has a length in the axial direction of 2000 to 2300 mm.
Furthermore, in the furnace roller of the continuous annealing furnace, the diameter of the straight section is 800-1000 mm.
Further, in the continuous annealing furnace roller of the present invention, the total crown of the continuous annealing furnace roller is set to C, which is obtained based on the following model:
C＝K0·(Tr－Ts)×D0/2+C0
wherein, K0Is the coefficient of thermal expansion of the furnace roller, D0The diameter of the straight section, Tr is the furnace roller temperature, Ts is the strip steel temperature, C0Is the reference convexity.
Further, in the continuous annealing furnace roller of the present invention, the reference crown C is set to be equal to or smaller than the reference crown C0The value range of (A) is 0.1-1.5.
Further, in the continuous annealing furnace roller of the present invention, wherein the total crown C is the sum of the crown C1 of the first taper section and the crown C2 of the second taper section, wherein C1/C2 is 1.2 to 1.5.
Further, in the furnace roller of the continuous annealing furnace, the value range of the furnace roller temperature Tr is 920-950 ℃, and/or the value range of the strip steel temperature Ts is 780-880 ℃.
Further, in the continuous annealing furnace roller of the present invention, the range of the thermal expansion coefficient is 15 × 10-6～30×10-6The dimension is 1/DEG C.
Compared with the prior art, the furnace roller of the continuous annealing furnace has the advantages and beneficial effects as follows:
the furnace roller of the continuous annealing furnace overcomes the defects in the prior art by the structural optimization design of double tapers, can obtain better plate passing speed and prevent buckling and deflection problems on one hand, and solves the transverse scratch problem or indentation scratch problem of the furnace roller on strip steel in the prior art by optimizing the taper of the furnace roller boss on the other hand, so that the production efficiency of the strip steel and the quality of the obtained strip steel products can be greatly improved by adopting the furnace roller of the continuous annealing furnace.
Drawings
FIG. 1 is a schematic view of a continuous annealing furnace roller according to an embodiment of the present invention.
Fig. 2 schematically shows the structure of a first transition arc of a continuous annealing furnace roller according to an embodiment of the present invention.
Fig. 3 schematically shows the structure of a second transition arc of a continuous annealing furnace roller according to an embodiment of the invention.
Detailed Description
The continuous annealing furnace roller according to the present invention will be further explained and illustrated with reference to the drawings and the specific examples, which, however, should not be construed as unduly limiting the technical solution of the present invention.
Fig. 1 to 3 schematically illustrate the structure of the rolls of the continuous annealing furnace according to the present invention. Wherein, FIG. 1 is a schematic structural view of a continuous annealing furnace roller according to an embodiment of the present invention. Fig. 2 schematically shows the structure of a first transition arc of a continuous annealing furnace roller according to an embodiment of the present invention. Fig. 3 schematically shows the structure of a second transition arc of a continuous annealing furnace roller according to an embodiment of the invention.
As shown in fig. 1, and referring to fig. 2 and 3 as necessary, in the present embodiment, the continuous annealing furnace rolls are provided as double taper rolls in which the total length of the roll body of the double taper roll is L, the double taper roll includes a straight section Lc at the middle, first taper sections Lt provided on both sides of the straight section Lc in the axial direction in close proximity, and the first taper angle is θ1And a second taper section Le arranged adjacent to each first taper section Lt, the second taper angle is theta 2, wherein the taper of the second taper section Le is different from that of the first taper section Lt, and a first transition circular arc with the radius r is arranged between the straight section Lc and the first taper section Lt 1A second transition arc with a radius r is arranged between the first taper section Lt and the second taper section Le2。
In FIG. 1, D is1Is the diameter of the circular cross section shared by the first and second tapered sections, D2The diameter of the circular section of the outermost end face of the second taper section is referred to.
The first transition arc and the second transition arc are convexIf the transition area of the table is too small, the strip steel will be indented or transversely scratched, and the radius r of the first transition arc is adjusted according to the transition area1And radius r of the second transition arc2The method is obtained based on the following models respectively, so that a better transition arc curve is obtained, and the quality problem of the strip steel caused by boss transition can be solved:
r1＝2×X1/θ1
r2＝2×X2/(θ1-θ2)
X1＝X2＝k×D0
wherein D is0Is the diameter of the straight section, k is a coefficient; theta1And theta2Respectively, the taper angle of the first taper section and the taper angle of the second taper section. Wherein the value of the coefficient k is 0.05-0.07. The length of the furnace roller of the continuous annealing furnace in the axial direction (namely the total length L of the roller body) is 2000-2300 mm. The diameter of the straight section Lc is 800-1000 mm.
The total convexity C is set according to the diameter of the furnace roller, the temperature of the furnace roller and the temperature of the strip steel, so that the strip steel produced by the furnace roller of the continuous annealing furnace in the embodiment can obtain better plate passing speed and can be prevented from buckling and deviating.
Based on this, the total convexity C is obtained by the following model:
C＝K0·(Tr－Ts)×D0/2+C0
wherein, K0Is the coefficient of thermal expansion of the furnace roller, D0The diameter of the straight section, Tr is the furnace roller temperature, Ts is the strip steel temperature, C0Is a reference convexity, wherein the reference convexity C0The value range of (A) is 0.1-1.5, the value range of the furnace roller temperature Tr is 920-950 ℃, and/or the value range of the strip steel temperature Ts is 780-880 ℃, and the thermal expansion coefficient K is0Has a value range of 15 × 10-6～30×10-6Dimension is 1/DEG C.
The total convexity C is the sum of the convexity C1 of the first taper section and the convexity C2 of the second taper section, and C1/C2 is 1.2-1.5.
The above-mentioned fig. 1-3 schematically show the structure of the present solution. Specific parameters used for the L continuous annealing furnace rolls of examples 1-6 of this case are set forth in table 1 below.
Table 1.
Figure BDA0001980359130000051
Table 2 shows the values of k for r when k takes different values1、r2And the production of the final strip.
Table 2.
Figure BDA0001980359130000052
Figure BDA0001980359130000061
As can be seen from Table 2, the larger the k value, the larger X1，X2The larger the value r1、r2The larger, X is from the viewpoint of reduction in the imprint on the boss1，X2The larger the value r1、r2The larger the size, the more advantageous it is because of r1、r2The radian needs to be specially polished by a grinding wheel, so that the roughness is very low after polishing the radian part, and X is1，X2The value increases. However, when the k value is too large and exceeds 0.7, the residual length of the straight section is too short, so that the original roughness can only be kept at the lower percentage of the original step width, the friction force on the surface of the strip steel furnace roller is reduced, and the deviation is easy to occur. And the smaller the k value, X 1、X2The smaller the value r1、r2The smaller the influence on the roll surface roughness, the smaller the camber portion r is, but the convex print is generated. Therefore, the value of the coefficient k is preferably limited to 0.05 to 0.07.
In conclusion, the furnace roller of the continuous annealing furnace overcomes the defects in the prior art by the structural optimization design of double tapers, can obtain better through plate speed and prevent buckling and deviation on the one hand, and solves the problem of transverse scratch or indentation scratch of the furnace roller on strip steel in the prior art by optimizing the taper of the furnace roller boss on the other hand, so that the production efficiency of the strip steel and the quality of the obtained strip steel products can be greatly improved by adopting the furnace roller of the continuous annealing furnace.
It should be noted that the prior art in the protection scope of the present invention is not limited to the examples given in the present application, and all the prior art which is not inconsistent with the technical scheme of the present invention, including but not limited to the prior patent documents, the prior publications and the like, can be included in the protection scope of the present invention.
In addition, the combination of the features in the present application is not limited to the combination described in the claims of the present application or the combination described in the embodiments, and all the features described in the present application may be freely combined or combined in any manner unless contradictory to each other.
It should also be noted that the above-mentioned embodiments are only specific embodiments of the present invention. It is apparent that the present invention is not limited to the above embodiments and similar changes or modifications can be easily made by those skilled in the art from the disclosure of the present invention and shall fall within the scope of the present invention.

Claims (8)

1. A continuous annealing furnace roller, characterized in that it is provided as a double-tapered roller comprising: the device comprises a straight section positioned in the middle, first taper sections which are arranged on two sides of the straight section in an adjacent mode along the axial direction, and second taper sections which are arranged in an adjacent mode to each first taper section, wherein the second taper sections are different from the first taper sections in taper; a first transition arc is arranged between the straight section and the first taper section, and a second transition arc is arranged between the first taper section and the second taper section;
wherein the radius r of the first transition arc1And said second transition circleRadius r of arc2Obtained based on the following models, respectively:
r1＝2×X1/θ1
r2＝2×X2/(θ1-θ2)
X1＝X2＝k×D0
wherein D is0Is the diameter of the straight section, k is a coefficient; theta1And theta2The taper angle of the first taper section and the taper angle of the second taper section are respectively, and the value of the coefficient k is 0.05-0.07.
2. The continuous annealing furnace roller according to claim 1, wherein the length in the axial direction thereof is 2000 to 2300 mm.
3. The continuous annealing furnace roller according to claim 1, wherein the diameter of the straight section is 800 to 1000 mm.
4. A continuous annealing furnace roller according to any one of claims 1-3, characterized in that the total crown of the continuous annealing furnace roller is set to C, which is obtained on the basis of the following model:
C＝K0·(Tr－Ts)×D0/2+C0
wherein, K0Is the coefficient of thermal expansion of the furnace roller, D0The diameter of the straight section, Tr is the furnace roller temperature, Ts is the strip steel temperature, C0Is the reference convexity.
5. The continuous annealing furnace roller of claim 4, wherein the reference crown C0The value range of (A) is 0.1-1.5.
6. The continuous annealing furnace roller of claim 4, wherein the total crown C is the sum of the crown C1 of the first taper section and the crown C2 of the second taper section, wherein C1/C2 is 1.2-1.5.
7. The continuous annealing furnace roller of claim 4, wherein the roller temperature Tr ranges from 920 ℃ to 950 ℃ and/or the strip temperature Ts ranges from 780 ℃ to 880 ℃.
8. The continuous annealing furnace roller of claim 4, wherein the coefficient of thermal expansion ranges from 15 x 10 -6～30×10-6The dimension is 1/DEG C.
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Publication number Priority date Publication date Assignee Title
CN113334165A (en) * 2021-06-23 2021-09-03 鞍山科德轧辊表面处理有限公司 Grinding method for tapered roller

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JPH07138655A (en) * 1993-11-19 1995-05-30 Nippon Steel Corp Method for giving crown to hearth roll for steel strip continuous annealing furnace
JPH1072625A (en) * 1996-08-30 1998-03-17 Kawasaki Steel Corp Method for controlling crown of hearth roll in continuous annealing furnace
CN201168720Y (en) * 2008-03-27 2008-12-24 南京钢铁股份有限公司 Stepped backing roll for steckel mill
CN103468922B (en) * 2012-06-06 2015-01-21 上海梅山钢铁股份有限公司 Control method for preventing thermal buckling of annealing furnace strip steel
CN105986116A (en) * 2015-02-13 2016-10-05 鞍钢股份有限公司 Method for controlling deviation of strip steel in continuous annealing furnace
CN108647451B (en) * 2018-05-15 2022-05-20 首钢集团有限公司 Continuous annealing furnace, furnace roller thereof and roller shape design method of furnace roller

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