CN111589872A - Roll assembly for rolling mill and heterogeneous rolling method thereof - Google Patents
Roll assembly for rolling mill and heterogeneous rolling method thereof Download PDFInfo
- Publication number
- CN111589872A CN111589872A CN202010441133.8A CN202010441133A CN111589872A CN 111589872 A CN111589872 A CN 111589872A CN 202010441133 A CN202010441133 A CN 202010441133A CN 111589872 A CN111589872 A CN 111589872A
- Authority
- CN
- China
- Prior art keywords
- roll
- rolling
- working
- rolling mill
- roller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005096 rolling process Methods 0.000 title claims abstract description 160
- 238000000034 method Methods 0.000 title abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 27
- 239000010959 steel Substances 0.000 claims description 27
- 239000000463 material Substances 0.000 claims description 26
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- 239000000919 ceramic Substances 0.000 claims description 7
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 5
- 229910001208 Crucible steel Inorganic materials 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 229910001315 Tool steel Inorganic materials 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 13
- 238000005516 engineering process Methods 0.000 description 11
- 229910001018 Cast iron Inorganic materials 0.000 description 8
- 229910000976 Electrical steel Inorganic materials 0.000 description 6
- 229910000997 High-speed steel Inorganic materials 0.000 description 6
- 238000005097 cold rolling Methods 0.000 description 6
- 239000002131 composite material Substances 0.000 description 6
- 238000011161 development Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000005242 forging Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910001141 Ductile iron Inorganic materials 0.000 description 2
- 229910001060 Gray iron Inorganic materials 0.000 description 2
- 230000000669 biting effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000009750 centrifugal casting Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 241000566150 Pandion haliaetus Species 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical group [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910001037 White iron Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000011195 cermet Substances 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000001513 hot isostatic pressing Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009718 spray deposition Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000004227 thermal cracking Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- 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
- 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
- B21B13/023—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally the axis of the rolls being other than perpendicular to the direction of movement of the product, e.g. cross-rolling
-
- 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
- B21B27/03—Sleeved rolls
- B21B27/032—Rolls for sheets or strips
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- 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
- B21B2013/021—Twin mills
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
The invention discloses a roll component used on a rolling mill and a rolling method thereof, wherein the roll component at least comprises two working rolls which are positioned above and below a rolled piece, each working roll comprises a roll body, a roll neck and a shaft head, the roll body diameters of the two working rolls are the same, and the comprehensive elastic modulus of the roll body of one working roll is more than or equal to 10% of the comprehensive elastic modulus of the roll body of the other working roll. The invention can realize heterogeneous rolling by adopting a simple and ideal rolling mill, improves the production efficiency of simple and ideal rolling, reduces the rolling force of asymmetric rolling and improves the plate precision.
Description
Technical Field
The invention relates to the technical field of material processing production, in particular to a roller assembly used on a rolling mill and a heterogeneous rolling method thereof, which enable the rolling mill originally adopting simple and ideal rolling to realize heterogeneous rolling.
Background
The rolling process is a process of pulling the rolled piece into the space between the rollers with different rotation directions by the friction force between the rolled piece and the rollers to generate plastic deformation. The plastic working of metal material, especially steel material, is completed by rolling for over 90%. Therefore, the rolling engineering technology plays an important role in the metallurgical industry and the national economic production.
Simple ideal rolling conditions: the rollers have the same diameter and the same rotating speed, the rollers are cylinder-shaped rigid bodies, rolled pieces are uniform continuous bodies, the deformation is uniform during rolling, and the rolled pieces are flat plates. Most strip mills use this type of rolling.
In addition to simple and ideal rolling, there is also rolling called asymmetric rolling, also called asynchronous rolling, which is produced by different roll diameters, rotational speeds and lubrication. Sach and Klinger are the first pair to find that when comparing sheets rolled by the same two pairs of rolls, the sheet will bend in the direction of the idler rolls. This is because the rotational speeds of the free roller and the drive roller are different. Many of the Pan and Sansome experiments were conducted with three material cold rolled strips just prior to asynchronous rolling (roll speed mismatch). Depending on the measure of the rolling force, torque and forward slip on the ratio of the roll speeds. Hwang and Tzou use similar pressure profiles at the top and bottom of the rolls to achieve the desired rolling force by assuming an arc of contact between the rolls and the sheet. Pietrzyk et al used elasto-plastic and rigid-plastic constitutive equations to compare plastic strain profiles with cold and hot asymmetric rolling exit radii of curvature. Lu et al studied the effects of roll speed mismatch and the scale of roll curvature diameter using elasto-plastic finite element analysis. In this study, its influence on the distribution of the positive and shear stresses in the asymmetric rolling, on the rolling forces and torques, on the position of the neutral point, on the size of the deformation zone and on the curvature of the rolled sheet is considered to be reduced by the finite element method (various deformation factors).
(1) Asymmetric rolling, generally takes the following three forms:
1) asymmetric rolling with unequal radii of the upper roller and the lower roller;
2) asymmetric rolling with unequal upper and lower roller speeds;
3) asymmetric rolling with different friction coefficients between the upper roller and the lower roller and the metal rolled piece.
(2) The advantages and problems of asymmetric rolling:
1) the asymmetric rolling has the advantages of reducing rolling pressure, improving the thickness precision of the strip steel of the rolled plate, reducing pass, saving energy and the like.
The metal rolled piece can cause shearing deformation in a deformation zone during asynchronous rolling, crystal grains can be refined, more sliding systems are excited in the deformation zone to participate in sliding and cross sliding, the rotating cubic texture is enhanced, very high local plastic deformation is concentrated in the shearing zone, and high deformation energy storage is achieved, so that the asynchronous rolling is beneficial to reducing the recrystallization temperature, reducing the energy consumption, reducing the rolling force and improving the production efficiency.
2) The asymmetric rolling is difficult to bite, the moment distribution is uneven, and the rolling mill chatter is easy to occur particularly in the case of the asynchronous rolling.
In recent decades, due to the rapid development of hot continuous rolling and cold continuous rolling technologies, the yield of steel products is rapidly improved, and the asynchronous rolling technology is forgotten. The traditional concept holds that the asynchronous rolling is only suitable for single-stand cold rolling production with low yield, and is hardly applied to a hot continuous rolling process. Only a new way is developed in Japan, the research of asynchronous rolling is actively carried out, the asynchronous rolling with asymmetric roller diameter is adopted in the last three frames on the newly-built hot continuous rolling strip steel production line of Japan Zhongshan steel, the industrial test of the asynchronous rolling of hot continuous rolling is carried out, and the application of the asynchronous rolling in the hot continuous rolling process is advanced to a certain extent. However, due to mutual coupling and complicated tandem rolling process parameters, the deformation rule and the phase change rule of a rolled piece are difficult to control, and the theoretical research on the deformation rule and the tissue evolution rule of metal by asynchronous rolling in the hot tandem rolling process is lacked, so that the application of the asynchronous rolling process in the hot tandem rolling production is seriously influenced, and a mature hot rolling manufacturer with the asynchronous rolling technology is not seen so far.
Rolls are the primary working components and tools on a rolling mill that produce continuous plastic deformation of metal. The roller mainly comprises a roller body, a roller neck and a shaft head. The rolls may be arranged in two, three, four or more rolls in the mill stand.
The variety and manufacturing process of the rolls are constantly evolving with the advancement of metallurgical technology and the evolution of rolling equipment. The low-strength gray cast iron roller is used for rolling soft nonferrous metal in the middle century. The uk in the middle of the 18 th century mastered the technology for producing chilled cast iron rolls for rolling steel plates. The progress of the European steelmaking technology in the second half of the 19 th century requires rolling of ingots of larger tonnage, neither gray cast iron nor chilled cast iron rolls have met the required strength. The common cast steel roller with the carbon content of 0.4 to 0.6 percent is correspondingly produced. The appearance of heavy forging equipment further improves the toughness of the forging roller with the composition. The use of alloying elements and the introduction of heat treatments in the early 20 th century significantly improved the wear and toughness of cast and wrought steel hot and cold rolls. The surface quality of the rolled material is improved after molybdenum is added into a cast iron roller for hot rolling the plate strip. The core strength of the casting roller is obviously improved by the composite pouring of the flushing method.
The large amount of alloy elements used in the roller is the result of the development of large-scale, continuous, high-speed and automatic rolling equipment after world war II, and the result of the higher requirements on the roller performance after the strength and deformation resistance of rolled materials are improved. In this period, semi-steel rolls and nodular cast iron rolls appear in sequence. The powdered tungsten carbide roller was developed after the 60's in the 20 th century. The centrifugal casting technology, the differential temperature heat treatment technology and the like of the roll widely popularized in Japan and Europe in the early 70 s obviously improve the comprehensive performance of the plate and strip roll. Composite high chromium cast iron rolls have also been successfully used on hot strip mills. At the same time, the forged white iron and semi-steel rolls are used in Japan. In Europe over the 80 s, high-chromium steel rolls and ultra-deep quench-hardened cold rolls were introduced, as well as special alloy cast iron rolls for finish rolling of small-sized steel sections and wire rods. The development of the steel rolling technology of the current generation promotes the development and development of a roller with higher performance. The centrifugal casting method and new composite methods such as continuous casting composite method (CPC method), spray deposition method (Osprey method), electroslag welding method and hot isostatic pressing method have been used for producing composite rolls in which the core part is forged steel or ductile iron with good toughness and the outer layer is high-speed steel series, and cermet rolls have been used in new-generation section bar, wire and strip mills in europe and japan, respectively.
There are various methods for classifying the rolls, mainly including:
1) according to the product type: strip steel rolls, profile steel rolls, wire rolls, etc.;
2) according to the position of the roller in the rolling mill series: a blooming roll, a roughing roll, a finishing roll, etc.;
3) according to the roller function: scale breaking rolls, perforating rolls, leveling rolls, etc.;
4) according to the material of the roller: steel rolls, cast iron rolls, cemented carbide rolls, ceramic rolls, and the like;
5) the manufacturing method comprises the following steps: casting rolls, forging rolls, surfacing rolls, bushing rolls, and the like;
6) according to the state of rolled steel: hot roll, cold roll.
The various classifications can be combined to make the rolls have a more definite meaning, such as centrifugally cast high-chromium cast iron work rolls for hot-rolled steel strip.
The materials and uses of the rolls are shown in Table 1-1. The properties and quality of a roll generally depend on its chemical composition and manner of manufacture and can be evaluated by its texture, physical and mechanical properties, and the type of residual stresses present inside the roll. The use effect of the roller in the rolling mill depends on the material and metallurgical quality of the roller, and is also related to the use condition, the roller design and the operation and maintenance. The use conditions of the rollers of different types of rolling mills are greatly different, and the difference is caused by the following factors:
1) the conditions of the rolling mill are as follows: such as mill type, mill and roll design, pass design, water cooling conditions, and bearing type;
2) rolling conditions are as follows: such as variety, specification and deformation resistance thereof, pressing system, temperature system, yield requirement, operation and the like of rolled materials;
3) requirements on product quality and surface quality, etc.
TABLE 1-1 commonly-used roller material and usage table
Note: the material of the composite roll neck is selected according to the strength requirement.
Therefore, different types of rolling mills and the same type of rolling mills with different use conditions have different requirements on the performance of the used rolls, for example, the rolls of the bloom and slab blooming mills have good torsion and bending strength, toughness, biting property, thermal cracking resistance, thermal shock resistance and wear resistance; and the hot strip finish rolling machine frame requires the roller surface to have the performances of high hardness, indentation resistance, wear resistance, stripping resistance, heat crack resistance and the like.
Hardness, the ability of a material to resist locally the penetration of a hard object into its surface is called hardness. The local resistance of solid to the invasion of external objects is an index for comparing the hardness of various materials. The modulus of elasticity is an amount of resistance of a material to elastic deformation, an indicator of the stiffness of the material. It is only dependent on the chemical composition of the material and on the temperature. Regardless of the structural change thereof and regardless of the heat treatment state. The elastic modulus E refers to the stress required for the material to deform elastically under an external force. It is an index reflecting the ability of the material to resist elastic deformation.
The modulus of elasticity increases with increasing stiffness, and for materials of the same recovery resistance, the modulus of elasticity is proportional to the square root of the stiffness.
Until now, homogeneous rolling materials (working rolls) have been used in various rolling methods, and heterogeneous rolling has not been reported as a heterogeneous rolling technique for plate and strip materials, although it is also asymmetric rolling.
Disclosure of Invention
The invention aims to provide a roller assembly for a rolling mill, which enables the rolling mill originally adopting simple and ideal rolling to realize heterogeneous rolling, namely two working rollers adopt different materials or have different comprehensive elastic modulus (the comprehensive elastic modulus is the square root of the elastic modulus plus the surface hardness) and the same diameter so as to realize symmetrical rolling in the aspect of geometry and actually asymmetrical rolling, including reversible single-machine rolling and continuous rolling, and simultaneously has the advantages of high production efficiency of simple and ideal rolling and the advantages of reducing rolling force and improving plate precision of asymmetrical rolling. It is another object of the present invention to provide a heterogeneous rolling method of such a roll assembly.
The invention aims to be realized by the following technical scheme:
a roll assembly for a rolling mill at least comprises two working rolls which are positioned above and below a rolled piece, each working roll consists of a roll body, a roll neck and a shaft head, the roll neck is positioned at one end of the roll body and is arranged in a bearing of the rolling mill, and the roll neck transmits rolling force to a rack through a bearing seat and a screw-down device; the other end of the shaft head, which is positioned on the roller body, is connected with a gear seat of the rolling mill through a connecting shaft, so that the rotating torque of the motor is transmitted to the roller body, and the roller body is provided with a smooth cylindrical surface or a surface with a groove. The diameters of the roll bodies of the two working rolls are the same, and the comprehensive elastic modulus of the roll body of one working roll is more than or equal to 10 percent of that of the roll body of the other working roll.
Preferably: the roller with large comprehensive elasticity modulus is positioned above the rolled piece, and the roller with small comprehensive elasticity modulus is positioned below the rolled piece.
As shown in FIG. 2, for a working roll with a large comprehensive elastic modulus, R is less than or equal to R1 and less than or equal to R2 in the elastic flattening formed with a rolled piece, R is less than or equal to R1 and less than or equal to R2 in the contact arc length, L1 is less than or equal to L2 in the contact arc length, R2 is more than or equal to R1 and more than or equal to R in the elastic flattening formed with the rolled piece, and L2 is more than or equal to L1 in: r is the original radius of the upper working roller and the lower working roller, R1 is the radius of the working roller with smaller comprehensive elastic modulus after elastic flattening, and R2 is the radius of the working roller with larger comprehensive elastic modulus after elastic flattening; l1 is the contact arc length of the work roll with smaller comprehensive elastic modulus after being elastically flattened, and L2 is the contact arc length of the work roll with larger comprehensive elastic modulus after being elastically flattened. Due to the elastic flattening and the contact arc length difference of the two rollers, the asynchronous rolling condition is formed.
The working roll with large comprehensive elastic modulus is made of tungsten carbide, metal ceramics, tool steel, forged steel (high-speed steel is more than or equal to semi-high-speed steel is more than or equal to roll steel), cast steel (high-carbon high-speed steel is more than or equal to high-chromium steel is more than or equal to common cast steel) cast iron and the like, and different materials and processing technologies are different, so that the comprehensive elastic modulus is different. Such as: the working roller with large comprehensive elastic modulus is made of metal ceramic, the working roller with small comprehensive elastic modulus is made of forged steel, the elastic modulus of the metal ceramic is more than twice that of the forged steel, and the rolling mill has the advantages of asynchronous rolling and ideal rolling, namely heterogeneous rolling.
The rolling method for heterogeneous rolling by using the combined roller of the invention comprises the following steps:
1) firstly, selecting the existing rolling mill or unit;
2) then, according to the size and the processing precision of the original lower working roll, a high-modulus roll is manufactured to be used as an upper working roll, and the comprehensive elastic modulus of the upper working roll is at least 10% higher than that of the original lower roll;
3) after the upper working roll is installed in a rolling mill, a rolled piece is selected, the original rolling material is referred, the production is carried out according to the original rolling process technical specification, the rolling force change is observed, and the surface quality and the precision of the rolled piece are detected. .
The invention has the advantages that:
(1) the two working rolls are heterogeneous, namely have different comprehensive elastic moduli, so that the two working rolls have all the advantages of asymmetric rolling, namely the advantages of reducing rolling pressure, improving the thickness precision of the strip steel of the rolled plate, reducing pass, saving energy and the like.
(2) As shown in figure 1, because the two working rolls have the same diameter and have the characteristic of geometric symmetry, the defects of asymmetric rolling are overcome, namely the problems of difficult biting, uneven torque distribution, easy occurrence of rolling mill vibration and the like particularly for asynchronous rolling are eliminated.
(3) The structure and the transmission mode of the original rolling mill are not changed, heterogeneous rolling can be realized only by improving the comprehensive elastic modulus of the upper working roll, the advantages of asymmetric rolling are achieved, the defects of asymmetric rolling are overcome, the product precision is improved, the variety and the specification of rolled products are expanded, and the upgrading of rolling mill equipment is realized.
(4) The heterogeneous rolling reduces the rolling force, reduces the rolling load of the whole roller system, prolongs the service life of all rollers, and realizes energy conservation and emission reduction.
(5) The invention is suitable for single-machine tension-free cold rolling (two-roller mill, four-roller mill, six-roller mill and multi-roller mill), single-machine reversible tension cold rolling (four-roller mill, six-roller mill and multi-roller mill), five-rack cold continuous rolling (four-roller mill, six-roller mill and eight-roller mill), seven-rack hot continuous rolling (four-roller mill and six-roller mill) and the like, and achieves the advantages of improving the production efficiency, reducing the rolling force and improving the precision of plates and strips.
Drawings
FIG. 1 is a diagram: the symmetrical rolling schematic diagram of the combined roller of the invention when a rolled piece bites;
FIG. 2 is a diagram of: the asymmetric rolling schematic diagram of the combined roller in normal rolling is shown.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
1) A straight pull type 250mm four-roller cold rolling mill is selected,
2) selecting a working roll of phi 90mm
The original working roll is made of Cr12MoV, the elastic modulus E is 206Gpa, the surface hardness HSD92 of the roll body,
reduced to HRA 84.1;
the high-modulus roll selection high-speed steel W6Mo5Cr4V2 mainly comprises the following components as shown in Table 1:
TABLE 1 Main Components in high-speed Steel W6Mo5Cr4V2
The elastic modulus E is 230Gpa, the surface hardness HRC of the roller body is 65.3, and the equivalent is HRA 84.1;
the comprehensive elastic modulus is 11.15 percent higher than that of the original working roll.
3) Loading the high-rigidity roller into a rolling mill as an upper working roller;
4) selecting 50W470 silicon steel sheets with the thickness of 0.50 multiplied by 130mm as rolled pieces;
5) rolling according to the original rolling schedule, namely adopting seven passes to roll into a 50W470 silicon steel thin strip with the thickness of 0.15 multiplied by 130mm, wherein the average rolling force of the passes is reduced by about 10 percent, the plate shape is good, the thickness precision is 0.15 +/-0.005 which is higher than that of two steel rollers by 0.15 +/-0.01, and the precision is doubled.
Example 2
1) A straight pull type 250mm four-roller cold rolling mill is selected,
2) selecting a working roll of phi 90mm
The original working roll is made of Cr12MoV, the elastic modulus E is 206Gpa, the surface hardness HSD92 of the roll body,
reduced to HRA 84.1;
the high modulus roller is a titanium carbonitride metal ceramic roller sleeve, the main components of which are TiN, TiC, SiC and Cr3C 2. The elastic modulus E is 450Gpa, and the surface hardness of the roller body is HRA 91.6;
the comprehensive elastic modulus is 113.6 percent higher than that of the original working roll.
3) Loading the high-rigidity roller into a rolling mill as an upper working roller;
4) selecting 50W470 silicon steel sheets with the thickness of 0.50 multiplied by 130mm as rolled pieces;
5) rolling according to the original rolling schedule, namely adopting seven passes to roll into a 50W470 silicon steel thin strip with the thickness of 0.10 multiplied by 130mm, wherein the average rolling force of the passes is reduced by 46 percent, the plate shape is good, the thickness precision is 0.10 +/-0.003 which is higher than that of two steel rolls by 0.10 +/-0.009, and the precision is improved by two times.
Example 3
1) A straight pull type 250mm four-roller cold rolling mill is selected,
2) selecting a working roll of phi 90mm
The original working roll is made of Cr12MoV, the elastic modulus E is 206Gpa, the surface hardness HSD92 of the roll body,
reduced to HRA 84.1;
the high modulus roller is made of hard alloy roller sleeve YG8, the main components are tungsten carbide (WC) and binder cobalt (Co). The elastic modulus E is 550Gpa, and the surface hardness HRA of the roller body is 88.1;
the comprehensive elastic modulus is 160 percent higher than that of the original working roll.
3) Loading the high-rigidity roller into a rolling mill as an upper working roller;
4) selecting 50W470 silicon steel sheets with the thickness of 0.50 multiplied by 130mm as rolled pieces;
5) rolling according to the original rolling schedule, namely adopting seven passes to roll into a 50W470 silicon steel thin strip with the thickness of 0.08 multiplied by 130mm, wherein the average rolling force of the passes is reduced by 52 percent, the plate shape is good, the thickness precision is 0.08 +/-0.002 which is higher than that of two steel rollers by 0.08 +/-0.008, and the precision is improved by three times.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (8)
1. The utility model provides a roll assembly for on rolling mill, includes two work rolls that are located the rolled piece top and below at least, and work roll comprises the roll body, the roll neck and spindle nose, its characterized in that: the roll bodies of the two working rolls have the same diameter and different materials, and the comprehensive elastic modulus of one working roll body is more than or equal to 10% of that of the other working roll body.
2. A roll assembly for use on a rolling mill according to claim 1 wherein: the working roll with large comprehensive elasticity modulus is positioned above the rolled piece, and the working roll with small comprehensive elasticity modulus is positioned below the rolled piece.
3. A roll assembly for use on a rolling mill according to claim 1 or 2, wherein:
the working roll with large comprehensive elastic modulus has small elastic flattening R which is not less than R1 and not more than R2, short contact arc length L1 and not more than L2, the working roll with small comprehensive elastic modulus has large elastic flattening R2 which is not less than R1 and not less than R, long contact arc length L2 which is not less than L1, wherein: r is the original radius of the upper working roller and the lower working roller, R1 is the radius of the working roller with smaller comprehensive elastic modulus after elastic flattening, and R2 is the radius of the working roller with larger comprehensive elastic modulus after elastic flattening; l1 is the contact arc length of the work roll with smaller comprehensive elastic modulus after being elastically flattened, and L2 is the contact arc length of the work roll with larger comprehensive elastic modulus after being elastically flattened.
4. A roll assembly for use on a rolling mill according to claim 1 wherein: the working roller with large comprehensive elastic modulus is made of one of tungsten carbide, metal ceramic, tool steel, forged steel or cast steel.
5. A roll assembly for use on a rolling mill according to claim 1 wherein: the working roll with large comprehensive elastic modulus is made of metal ceramics, and the working roll with small comprehensive elastic modulus is made of forged steel.
6. A roll assembly for use on a rolling mill according to claim 1 wherein: the roll neck is positioned at one end of the roll body, is arranged in a bearing of the rolling mill, and transmits rolling force to the stand through a bearing seat and a screw-down device; the other end of the shaft head, which is positioned on the roller body, is connected with a gear seat of the rolling mill through a connecting shaft, and the rotating torque of the motor is transmitted to the roller body.
7. A roll assembly for use on a rolling mill according to claim 6 wherein: the roll body has a smooth cylindrical or grooved surface.
8. A roll assembly for use on a rolling mill according to any one of claims 1 to 7 wherein the differential rolling process includes the steps of:
1) firstly, selecting the existing rolling mill or unit;
2) then, according to the size and the processing precision of the original lower working roll, a high-modulus roll is manufactured to be used as an upper working roll, and the comprehensive elastic modulus of the upper working roll is at least 10% higher than that of the original lower roll;
3) after the upper working roll is installed in a rolling mill, a rolled piece is selected, and the rolling mill is produced according to the technical specifications of the original rolling process by referring to the original rolling material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010400721 | 2020-05-13 | ||
| CN2020104007217 | 2020-05-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111589872A true CN111589872A (en) | 2020-08-28 |
Family
ID=72191386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010441133.8A Pending CN111589872A (en) | 2020-05-13 | 2020-05-22 | Roll assembly for rolling mill and heterogeneous rolling method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111589872A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112131728A (en) * | 2020-09-10 | 2020-12-25 | 东北大学 | Deformation resistance calculation method for asynchronous continuous rolling process of steel strip |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02251301A (en) * | 1989-03-27 | 1990-10-09 | Nippon Steel Corp | Method for rolling thin metallic plate |
| CN1191780A (en) * | 1997-02-25 | 1998-09-02 | 中国科学院力学研究所 | Asynchronous metal sheet rolling process in common cold roller |
| CN101622081A (en) * | 2007-02-27 | 2010-01-06 | 日本碍子株式会社 | Method of rolling metal sheet material and rolled sheet material produced by the rolling method |
| CN102861772A (en) * | 2012-09-24 | 2013-01-09 | 东北大学 | Method for determining minimum rolling gauge of extra-thin belt in asynchronous rolling |
-
2020
- 2020-05-22 CN CN202010441133.8A patent/CN111589872A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02251301A (en) * | 1989-03-27 | 1990-10-09 | Nippon Steel Corp | Method for rolling thin metallic plate |
| CN1191780A (en) * | 1997-02-25 | 1998-09-02 | 中国科学院力学研究所 | Asynchronous metal sheet rolling process in common cold roller |
| CN101622081A (en) * | 2007-02-27 | 2010-01-06 | 日本碍子株式会社 | Method of rolling metal sheet material and rolled sheet material produced by the rolling method |
| CN102861772A (en) * | 2012-09-24 | 2013-01-09 | 东北大学 | Method for determining minimum rolling gauge of extra-thin belt in asynchronous rolling |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112131728A (en) * | 2020-09-10 | 2020-12-25 | 东北大学 | Deformation resistance calculation method for asynchronous continuous rolling process of steel strip |
| CN112131728B (en) * | 2020-09-10 | 2023-10-13 | 东北大学 | Deformation resistance calculation method in steel belt asynchronous continuous rolling process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1222371C (en) | Method and installation for producing metal strips and sheets | |
| CN105107840B (en) | Magnesium alloy plate surface drastic deformation rolling device and method | |
| KR100248240B1 (en) | Method of producing a stainless steel sheet having excellent brightness | |
| CN110883093B (en) | Asynchronous cold rolling forming process for aluminum alloy stainless steel composite plate | |
| CN102634738B (en) | Supporting roller with roughness keeping capability and manufacturing method thereof | |
| CN105234174B (en) | A kind of milling method of magnesium and magnesium alloy strip in razor-thin | |
| Ray | Principles and applications of metal rolling | |
| CN106180194B (en) | The technique that high temperature alloy bar perforation prepares tubing | |
| CN109797393B (en) | Steel-copper composite wear-resistant material for manufacturing screw down nut of rolling mill by laser | |
| CN100467147C (en) | Method for rolling large-size square steel by single machine frame without groove | |
| CN109332389B (en) | Method for cross rolling of magnesium alloy | |
| CN102632175A (en) | Radial forging process of cast-state magnesium alloy tube | |
| CN103436789B (en) | Hot roll for rolling aluminium products and manufacturing method thereof | |
| CN111589872A (en) | Roll assembly for rolling mill and heterogeneous rolling method thereof | |
| Fajfar et al. | Asymmetric rolling process | |
| JPH05154514A (en) | Grooved roll for rolling and manufacture of its roll body | |
| CN100444989C (en) | High-alloy seamless deformed pipe material processing technology | |
| CN1211170C (en) | Method of rolling sheet and rolling machine | |
| EP2012944B1 (en) | Rolling plant | |
| JP6540631B2 (en) | Cold tandem rolling mill and method of manufacturing cold rolled steel sheet | |
| CN115193920A (en) | Core rod manufacturing method, core rod repairing method and equipment for machining core rod | |
| CN112680657B (en) | Method for manufacturing non-ferrous hot-rolled semi-high-speed steel working roll | |
| CN103510015A (en) | Working roll of pickling and scale breaking tension leveler and its manufacturing process | |
| CN213001822U (en) | Two-roller working roller for centrifugally casting narrow strip steel | |
| CN216420630U (en) | Continuous cold rolling die for titanium alloy plate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200828 |
|
| RJ01 | Rejection of invention patent application after publication |