Flat steel rolling system and rolling method

Abstract

The present application relates to a flat steel rolling system and rolling method, including: S1. heating the rolled piece to be rolled; S2. rolling the rolled piece by a universal rough rolling mill; S3. performing a cutting treatment on the rolled piece after being rolled by the universal rough rolling mill; S4. rolling the rolled piece after the cutting treatment by a universal medium rolling mill; S5. performing a cutting treatment on the rolled piece after being rolled by the universal medium rolling mill, and adjusting the temperature of the rolled piece by a temperature control device; S6. rolling the rolled piece treated by step S5 by a universal finishing mill; S7. adjusting the temperature of the rolled piece by a temperature control device and performing a cutting treatment on the rolled piece treated by step S6. The present application solves the technical problems of poor biting, poor dimensional accuracy and poor product appearance control in the rolling process of the combination of driving rollers and driven rollers by setting the horizontal rollers and vertical rollers to use driving rollers, and the horizontal rollers and vertical rollers rotate and bite the rolled piece at the same time.

Description

Technical Field

[0001] The present application relates to the technical field of steel rolling production, and in particular to a flat steel rolling system and a rolling method. Background Art

[0002] As a kind of steel-based material, flat steel is widely used in the production of steel components, plate rings for fixed support and shock absorption in the field of automobile machinery, and other raw materials. It is indispensable in the manufacturing industry and infrastructure. Spring flat steel used as plate rings is mainly used in light vehicles, medium and heavy vehicles, trucks, etc. With the rapid development of the automobile industry, the use of flat steel in the field of automobile manufacturing has also increased significantly, and the requirements for product quality (surface, internal) have become more and more stringent.

[0003] However, the existing flat steel production process generally adopts the flat-vertical hole type system for rolling. Specifically, the flat steel is produced by forcing the widening and deformation of the two-roll hole type. However, the flat-vertical hole type system for rolling has the following defects: the hole type specifications are not universal. When the specification span is large, the hole slot or roller needs to be replaced during shutdown, which affects the production efficiency and capacity; the wear and service life of the hole slot need to be improved and improved; the deformation of each pass is still limited to two directions, and it is impossible to achieve synchronous deformation in four directions, which affects the deformation efficiency of each pass; because there are only two directions of deformation, the requirements for the aspect ratio of the flat steel and the hole slot design are high. The wider and thinner the variety, the greater the groove depth on the roller, which has a certain impact on the strength, service life and production stability of the roller. In the last deformation, due to the two-roll hole type rolling, the width direction is free widening deformation, and the edge size and quality cannot be stably controlled. Under normal operation, on-site production personnel are used to determine the production by experience, and the dimensional accuracy control is unstable. In addition, the national standard has high requirements for edge size, and stable production is difficult.

[0004] There are also methods of rolling flat steel using a universal rolling mill. For example, CN107824613A discloses a method for rolling a ball flat steel. The rolling device used in the method includes a universal rolling mill unit. The universal rolling mill unit is composed of at least two universal rolling mills. Any universal rolling mill has an upper horizontal roller, a lower horizontal roller, an operating side vertical roller, and a transmission side vertical roller; both ends of the lower horizontal roller are chamfered so that the upper horizontal roller, the lower horizontal roller, the operating side vertical roller, and the transmission side vertical roller are combined to form a combined ball flat steel rolling hole. The shape of the combined ball flat steel rolling hole is the shape of two ball flat steels combined together. The webs of the two ball flat steels are connected together to form a combined web, and the ball heads are divided into The two legs are located on the same side of the connected web as the left leg and the right leg, and the rolling method includes the following: controlling the size of each part of the combined bulb flat steel by moving a total of four rollers, namely, an upper horizontal roller, a lower horizontal roller, an operating side vertical roller and a driving side vertical roller; the thickness of the combined web can be reduced by moving the upper horizontal roller downward, the lower horizontal roller upward or both actions simultaneously; the thickness of the combined web can be increased by moving the upper horizontal roller upward, the lower horizontal roller downward or both actions simultaneously; the thickness of the left leg can be increased by moving the operating side vertical roller to the left, and the thickness of the left leg can be reduced by moving it to the right; the thickness of the right leg can be increased by moving the driving side vertical roller to the right, and the thickness of the right leg can be reduced by moving it to the left

[0005] The method of rolling bulb flat steel can significantly increase the rolling batch and reduce the consumption of rolling rolls. However, the method is suitable for a specific type of flat steel - bulb flat steel, and is not suitable for rolling conventional flat steel. In addition, the universal rolling mill in the device used in the method contains two transmission rollers and two drive rollers. These two transmission rollers and two drive rollers exert a reverse force on the rolled piece during the rolling process, and the dimensional accuracy of the finished product needs to be further improved. Summary of the invention

[0006] In view of the above-mentioned shortcomings of the prior art, the present application provides a universal rolling mill, a universal rolling mill unit and a flat steel rolling system to further improve the dimensional accuracy of the obtained flat steel products.

[0007] In a first aspect, the present application provides a flat steel rolling method, wherein the rolling system used comprises a universal roughing mill unit, a universal medium rolling mill unit and a universal finishing mill unit which are arranged in sequence, and the flat steel rolling method comprises:

[0008] S1. Heat treatment of the rolled product;

[0009] S2. rolling the heated workpiece by a universal rough rolling mill unit, wherein the universal rough rolling mill unit comprises at least two universal rough rolling mills, wherein the universal rough rolling mill comprises two horizontal rolls arranged opposite to each other in a vertical direction and two vertical rolls arranged opposite to each other in a horizontal direction, wherein the two horizontal rolls and the two vertical rolls are combined to form a rolling hole, and the horizontal rolls and the vertical rolls are both driven rolls;

[0010] S3. Perform irregular section cutting on the rolled piece after rolling by the universal roughing mill unit;

[0011] S4. rolling the cut-off workpiece by a universal medium rolling mill unit, wherein the universal medium rolling mill unit comprises at least two universal medium rolling mills, wherein the universal medium rolling mill comprises two horizontal rolls arranged opposite to each other in a vertical direction and two vertical rolls arranged opposite to each other in a horizontal direction, wherein the two horizontal rolls and the two vertical rolls are combined to form a rolling hole, and the horizontal rolls and the vertical rolls are both driven rolls;

[0012] S5. Perform irregular section cutting on the rolled piece after rolling by the universal rolling mill unit and adjust the temperature of the rolled piece;

[0013] S6. rolling the rolled piece processed in step S5 by a universal finishing mill unit, wherein the universal finishing mill unit comprises at least two universal finishing mills, wherein the universal finishing mills comprise two horizontal rolls arranged opposite to each other in a vertical direction and two vertical rolls arranged opposite to each other in a horizontal direction, wherein the two horizontal rolls and the two vertical rolls are combined to form a rolling hole, and the horizontal rolls and the vertical rolls are both driven rolls;

[0014] S7. Perform irregular section cutting on the rolled piece processed in step S6.

[0015] It should be noted that, during the rolling process, the rolling line speed of the downstream rolling mill is the product of the rolling line speed of the adjacent upstream rolling mill and the elongation coefficient of the downstream rolling mill.

[0016] It should be understood that, in the present application, upstream and downstream refer to upstream and downstream along the running direction of the rolled piece.

[0017] In an exemplary embodiment of the present application, in step S1, the rolled piece is heated to 1000-1200°C, preferably 1000-1150°C.

[0018] In an exemplary embodiment of the present application, in step S2, along the running direction of the rolled piece, the rolling line speed of the first universal roughing mill is 0.1-1 m / s, preferably 0.6-1 m / s.

[0019] In an exemplary embodiment of the present application, in step S2, the rolling temperature is 850-1150°C, preferably 900-1000°C.

[0020] In an exemplary embodiment of the present application, in step S2, the rolling passes are 6-12 passes, preferably 6-18 passes.

[0021] In an exemplary embodiment of the present application, in step S2, the elongation coefficient of each pass is 1.2-1.5, preferably 1.3-1.4.

[0022] In an exemplary embodiment of the present application, during the rolling process described in step S2, the linear speeds of the two horizontal rolls and the two vertical rolls of the same universal rough rolling mill are the same.

[0023] In an exemplary embodiment of the present application, in step S4, the rolling temperature is 850-1050°C, preferably 850-950°C.

[0024] In an exemplary embodiment of the present application, in step S4, the rolling passes are 6-12 passes, preferably 6-8 passes.

[0025] In an exemplary embodiment of the present application, in step S4, the elongation coefficient of each pass is 1.2-1.4, preferably 1.25-1.35.

[0026] In an exemplary embodiment of the present application, during the rolling process described in step S4, the linear speeds of the two horizontal rolls and the two vertical rolls of the same universal rolling mill are the same.

[0027] In an exemplary embodiment of the present application, in step S5, the temperature of the rolled piece is adjusted to 750-950°C, preferably 780-900°C.

[0028] In an exemplary embodiment of the present application, in step S6, the rolling temperature is 750-950°C, preferably 800-900°C.

[0029] In an exemplary embodiment of the present application, in step S6, the rolling passes are 6-12 passes, preferably 6-8 passes.

[0030] In an exemplary embodiment of the present application, in step S6, the elongation coefficient of each pass is 1.2-1.3, preferably 1.2-1.25.

[0031] In an exemplary embodiment of the present application, during the rolling process described in step S6, the linear speeds of the two horizontal rolls and the two vertical rolls of the same universal finishing mill are the same.

[0032] In an exemplary embodiment of the present application, after step S6, a cooling step is also included.

[0033] In another aspect, the present application further provides a flat steel rolling system, comprising a heating device, a universal rough rolling mill unit, a first cutting device, a universal intermediate rolling mill unit, a second cutting device, a universal finishing mill unit and a cooling device arranged in sequence; a third cutting device is arranged downstream of the universal finishing mill unit;

[0034] The universal rough rolling mill unit comprises at least two universal rough rolling mills, the universal rough rolling mills comprising two horizontal rolls arranged opposite to each other in the vertical direction and two vertical rolls arranged opposite to each other in the horizontal direction, the two horizontal rolls and the two vertical rolls are combined together to form a rolling hole, and the horizontal rolls and the vertical rolls are both driven rolls;

[0035] The universal medium rolling mill unit comprises at least two universal medium rolling mills, the universal medium rolling mills comprising two horizontal rolls arranged opposite to each other in the vertical direction and two vertical rolls arranged opposite to each other in the horizontal direction, the two horizontal rolls and the two vertical rolls are combined together to form a rolling hole, and the horizontal rolls and the vertical rolls are both driven rolls;

[0036] The universal finishing mill unit includes at least two universal finishing mills, and the universal finishing mill includes two horizontal rolls arranged opposite to each other in the vertical direction and two vertical rolls arranged opposite to each other in the horizontal direction. The two horizontal rolls and the two vertical rolls are combined together to form a rolling hole, and the horizontal rolls and the vertical rolls are both driven rolls.

[0037] In an exemplary embodiment of the present application, the flat steel rolling system further comprises a descaling device, wherein the descaling device is located between the heating device and the universal finishing mill unit.

[0038] In an exemplary embodiment of the present application, the flat steel rolling system also includes a first temperature regulating device and / or a second temperature regulating device, the first temperature regulating device is located between the universal intermediate rolling mill unit and the universal finishing rolling mill unit, and the second temperature regulating device is located downstream of the universal finishing rolling mill unit.

[0039] In an exemplary embodiment of the present application, the first temperature adjustment device and / or the second temperature adjustment device adopts an online water cooler or an online water mist cooler or an air cooler.

[0040] In an exemplary embodiment of the present application, the flat steel rolling system further comprises a pre-rolling mill, wherein the pre-rolling mill is located between the heating device and the universal intermediate rolling mill unit.

[0041] In an exemplary embodiment of the present application, the flat steel rolling system further comprises a power mechanism, which connects the horizontal rolls and vertical rolls of the universal roughing mill and / or the universal intermediate rolling mill and / or the universal finishing mill.

[0042] As described above, the flat steel rolling system and rolling method of the present invention have the following beneficial effects:

[0043] (1) By setting the horizontal rolls and the vertical rolls to be drive rolls, the horizontal rolls and the vertical rolls rotate and bite the workpiece at the same time, which can solve the technical problems of poor bite, dimensional accuracy and poor product appearance control in the existing technology of the combination of drive rolls and driven rolls during the rolling process. In the free hole system composed of four rolls, the overall compression deformation in each pass is uniform, the cross-sectional deformation is uniform, the dimensional accuracy of the workpiece is higher, the internal stress is smaller, and the organizational properties are more uniform. The metal flow and rubbing due to forced compression are reduced, and the surface quality of the flat steel is improved.

[0044] (2) The entire production line is flexible in production. For original billets with different cross-sections, under the same roller matching conditions, only the roll gap of the rolling mill needs to be appropriately adjusted to change the free hole profile composed of four rolls. There is no need to replace the rolling mill rolls and hole slots to adapt to the production of flat steel products within a certain specification range. The production operation is more flexible and the roll utilization rate is higher. The rolling method and rolling system of the present application can be applied to the production of flat steel products of various specifications. Compared with the traditional two-roller rolling production process, the rolling method and rolling system of the present application have high rolling efficiency, simple hole profile and supporting guide system design, lower production failure rate, long service life of the free hole profile composed of the rolling mill rolls, and higher production efficiency.

[0045] (3) Through the process parameter control and pass evolution design of four-roll deformation rolling, the dimensional accuracy and internal performance uniformity of the finished flat steel are further improved.

[0046] (4) The present application adopts a universal rolling mill for rolling, which reduces the rolling temperature and thus reduces energy consumption.

[0047] (5) The four-roll universal rolling of flat steel greatly increases the degree of deformation in each pass, and the four sides are compressed and deformed at the same time, which improves the deformation efficiency, increases the deformation capacity of a single pass, and has a large elongation coefficient. Under the same total elongation coefficient, the number of rolling passes is greatly reduced, which reduces the number of deformation passes and the number of rolling mills in the entire production line, which is conducive to compact workshop process flow and equipment design, reduces construction investment and later operating costs, and improves product returns and competitiveness.

[0048] (6) The four-roll universal rolling mill of the present application can adjust and control the roll gap online through electrical and hydraulic means to meet the dynamic adjustment of various process parameters required in the production process.

[0049] (7) The present application has a wide range of applications and has significant advantages over traditional flat steel production. The dimensional accuracy of the flat steel rolled using the method of the present application can be controlled within 50% of the existing process accuracy level. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0051] Figure 1 It is a structural schematic diagram of a flat steel rolling system of Example 1;

[0052] Figure 2 for Figure 1 Schematic diagram of the hole structure of the universal rolling mill used in the medium universal rough rolling mill unit and the universal medium rolling mill unit;

[0053] Figure 3 for Figure 1 Schematic diagram of the hole structure of the universal mill used in the universal finishing mill unit;

[0054] Figure 4 This is a schematic structural diagram of the flat steel rolling system of Example 2.

[0055] Reference numerals

[0056] 1- rolled product;

[0057] 21-horizontal roller, 22-vertical roller, 23-rolling hole, 24-roller gap;

[0058] 3- Heating device;

[0059] 4- Descaling device;

[0060] 5-Universal roughing mill unit;

[0061] 6- first cutting device;

[0062] 7-Universal medium rolling mill unit;

[0063] 8- first temperature regulating device;

[0064] 9- second cutting device;

[0065] 10-Universal finishing mill unit;

[0066] 11- second temperature adjustment device;

[0067] 12- third cutting device;

[0068] 13- Cooling device;

[0069] 14- Pre-rolling mill;

[0070] 15-Power mechanism. DETAILED DESCRIPTION

[0071] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without carrying out creative work are within the scope of protection of this application.

[0072] Technologies, methods, and apparatus known to ordinary technicians in the relevant field may not be discussed in detail, but where appropriate, such technologies, methods, and apparatus should be considered part of the authorization specification.

[0073] In the description of the present invention, it should be understood that the use of terms such as "first", "second", and "third" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0074] The present application discloses a flat steel rolling method, wherein the rolling system used in the method comprises a universal rough rolling mill unit, a universal medium rolling mill unit and a universal finishing rolling mill unit which are arranged in sequence, and the flat steel rolling method comprises:

[0075] S1. heating the rolled piece to be rolled to 1000-1200℃; S2. rolling the heated rolled piece with a universal rough rolling mill unit, the rolling temperature is 850-1150℃, along the running direction of the rolled piece, the rolling line speed of the first universal rough rolling mill is 0.1-1m / s, the number of rolling passes is 6-12, and the elongation coefficient of each pass is 1.4-1.5; the universal rough rolling mill unit includes at least 2 universal rough rolling mills, the universal rough rolling mill includes two horizontal rollers arranged opposite to each other in the vertical direction and two vertical rollers arranged opposite to each other in the horizontal direction, the two horizontal rollers and the two vertical rollers are combined to form a rolling hole, and the horizontal rollers and the vertical rollers are both driven rollers; during the rolling process, the two horizontal rollers and the two vertical rollers of the same universal rough rolling mill have the same line speed;

[0076] S3. Perform irregular section cutting on the rolled piece after rolling by the universal roughing mill unit;

[0077] S4. The cut-off pieces are rolled by a universal medium rolling mill, the rolling temperature is 850-1050°C, the number of rolling passes is 6-12, and the elongation coefficient of each pass is 1.3-1.4; the universal medium rolling mill unit includes at least two universal medium rolling mills, the universal medium rolling mill includes two horizontal rollers arranged opposite to each other in the vertical direction and two vertical rollers arranged opposite to each other in the horizontal direction, the two horizontal rollers and the two vertical rollers are combined to form a rolling hole, and the horizontal rollers and the vertical rollers are both driven rollers; during the rolling process, the linear speeds of the two horizontal rollers and the two vertical rollers of the same universal medium rolling mill are the same.

[0078] S5. Perform irregular section cutting on the rolled piece after rolling by the universal rolling mill unit, and adjust the temperature of the rolled piece to 750-950°C;

[0079] S6. The rolled product processed in step S5 is rolled by a universal finishing mill unit, the rolling temperature is 750-950°C, the number of rolling passes is 6-12, and the elongation coefficient of each pass is 1.2-1.3; the universal finishing mill unit comprises at least two universal finishing mills, the universal finishing mill comprises two horizontal rolls arranged opposite to each other in the vertical direction and two vertical rolls arranged opposite to each other in the horizontal direction, the two horizontal rolls and the two vertical rolls are combined to form a rolling hole, and the horizontal rolls and the vertical rolls are both driven rolls; during the rolling process, the linear speeds of the two horizontal rolls and the two vertical rolls of the same universal finishing mill are the same;

[0080] S7. Perform irregular section cutting on the rolled piece after the processing in step S6 and cool it.

[0081] In another aspect, the present application also provides a flat steel rolling system used in the rolling method as described above, comprising a heating device, a descaling device, a universal roughing mill unit, a first cutting device, a universal intermediate rolling mill unit, a second cutting device, a universal finishing mill unit and a cooling device arranged in sequence;

[0082] The universal rough rolling mill unit comprises at least two universal rough rolling mills, the universal rough rolling mills comprising two horizontal rolls arranged opposite to each other in the vertical direction and two vertical rolls arranged opposite to each other in the horizontal direction, the two horizontal rolls and the two vertical rolls are combined together to form a rolling hole, and both the horizontal rolls and the vertical rolls are driven rolls;

[0083] The universal intermediate rolling mill unit comprises at least two universal intermediate rolling mills, the universal intermediate rolling mills comprising two horizontal rolls arranged opposite to each other in the vertical direction and two vertical rolls arranged opposite to each other in the horizontal direction, the two horizontal rolls and the two vertical rolls are combined together to form a rolling hole, and both the horizontal rolls and the vertical rolls are driven rolls;

[0084] A first temperature regulating device and a second cutting device are arranged between the universal intermediate rolling mill unit and the universal finishing rolling mill unit;

[0085] The universal finishing mill unit comprises at least two universal finishing mills, the universal finishing mills comprising two horizontal rolls arranged opposite to each other in the vertical direction and two vertical rolls arranged opposite to each other in the horizontal direction, the two horizontal rolls and the two vertical rolls are combined together to form a rolling hole, and both the horizontal rolls and the vertical rolls are driven rolls;

[0086] A second temperature regulating device and a third cutting device are provided downstream of the universal finishing mill unit;

[0087] The first temperature regulating device and / or the second temperature regulating device adopts an online water cooler or an online water mist cooler or an air cooler.

[0088] In another exemplary embodiment of the present application, the flat steel rolling system further comprises a pre-rolling mill, which is located between the heating device and the universal medium rolling mill unit.

[0089] In another exemplary embodiment of the present application, the flat steel rolling system further includes a power mechanism, which connects the horizontal rolls and the vertical rolls of the universal roughing mill and / or the universal intermediate rolling mill and / or the universal finishing mill.

[0090] In the following description, numerous details are discussed to provide a more thorough explanation of the embodiments of the present application; however, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without these specific details.

[0091] Example 1

[0092] See also Figure 1 , Figure 1 It is a structural schematic diagram of the flat steel rolling system of this embodiment.

[0093] like Figure 1 As shown, in this embodiment, the flat steel rolling system includes a heating device 3, a descaling device 4, a universal roughing mill unit 5, a first cutting device 6, a universal medium rolling mill unit 7, a second cutting device 9, a universal finishing mill unit 10 and a cooling device 13 which are arranged in sequence.

[0094] The heating device 3 is used to heat the rolled piece 1 to facilitate the subsequent rolling process. The heating device 3 can be a gas heating furnace, an oil medium heating furnace, an electric induction heating device, etc. The gas heating furnace, the oil medium heating furnace, the electric induction heater, etc. are existing technologies and will not be described in detail here.

[0095] The descaling device 4 removes the scales on the surface of the workpiece 1 to be rolled by spraying high-pressure water (pressure is generally 20-30MPa) onto the surface of the workpiece 1 to be rolled. The high-pressure water forms an impact force on the surface of the workpiece 1 to be rolled at a high jet velocity. When this impact force reaches a certain level, it is higher than the critical crushing pressure value of the scales on the surface of the rolled workpiece 1, so that the scales can fall off the surface of the rolled workpiece 1. Descaling the workpiece by the descaling device 4 can effectively remove iron oxide scales and improve the surface quality of the finished product. The descaling device is a prior art and will not be described in detail here.

[0096] The universal rough rolling mill unit 5 includes two universal rough rolling mills arranged along the upstream and downstream. The structure of the universal rough rolling mill unit 5 is as follows: Figure 2 The universal rough rolling mill unit 5 is used to perform preliminary rolling on the heated and descaled rolled piece 1 to deform the rolled piece 1.

[0097] The universal rough rolling mill includes two horizontal rolls 21 arranged opposite to each other in the vertical direction and two vertical rolls 22 arranged opposite to each other in the horizontal direction. The two horizontal rolls 21 and the two vertical rolls 22 are combined to form a rolling hole 23 and a roll gap 24. The rolling holes 23 and / or roll gaps 24 of the upstream and downstream adjacent universal rough rolling mills are staggered. Both the horizontal rolls 21 and the vertical rolls are driven rolls, which are prior art and will not be described in detail here.

[0098] Along the running direction of the rolled piece 1, the curvature of the cross section of the surface of the horizontal roller 21 and the vertical roller 22 of the rolling mill on the side adjacent to the rolling hole 23 tends to decrease. Specifically, along the running direction of the rolled piece 1, the curvature of the cross section of the surface of the horizontal roller 21 and the vertical roller 22 of the rolling mill on the side adjacent to the rolling hole 23 tends to decrease. In the roughing and medium rolling passes, the curvature can be a larger arc. The closer to the final finished pass, the curvature decreases. The final finished pass is consistent with the standard section of the product. Through the gradual change of the pass, the uniform deformation of the rolled piece is controlled, the deformed section and quality of the rolled piece are stably and effectively controlled, and the product dimensional accuracy is improved.

[0099] Please continue reading Figure 1 A first cutting device 6 is provided between the universal rough rolling mill unit 5 and the intermediate rolling mill unit 7. The first cutting device 6 is used to cut the rolled piece 1 preliminarily rolled by the universal rough rolling mill unit 5 to cut off the irregular section of the rolled piece 1. The first cutting device 6 can be a flying shear, a sawing machine, etc. The flying shear and the sawing machine are prior arts and will not be described in detail here.

[0100] The universal intermediate rolling mill unit 7 includes two universal intermediate rolling mills arranged along the upstream and downstream. The structure of the universal intermediate rolling mill unit 7 is as follows: Figure 2 The universal medium rolling mill unit 7 is used to further roll the preliminarily rolled piece 1 to further shape the piece 1 so that the piece 1 can meet the rolling requirements of the subsequent finishing rolling process.

[0101] The universal intermediate rolling mill includes two horizontal rolls 21 arranged opposite to each other in the vertical direction and two vertical rolls 22 arranged opposite to each other in the horizontal direction. The two horizontal rolls 21 and the two vertical rolls 22 are combined to form a rolling hole 23 and a roll gap 24. The rolling holes and / or roll gaps 24 of the upstream and downstream adjacent universal intermediate rolling mills are staggered, and along the running direction of the rolled piece, the rolling holes 23 and / or roll gaps 24 of the first universal intermediate rolling mill in the universal intermediate rolling mill unit 7 and the universal rough rolling mill adjacent to the first universal intermediate rolling mill are staggered. Both the horizontal rolls 21 and the vertical rolls are driven rolls, which are prior art and will not be described in detail here.

[0102] Please continue reading Figure 1 A first temperature regulating device 8 and a second cutting device 9 are arranged between the universal medium rolling mill unit 7 and the universal finishing rolling mill unit 10.

[0103] During the rolling process, the microscopic grain structure of the rolled piece 1 changes, and the change in the microscopic grain structure causes the temperature of the rolled piece 1 to rise. The first temperature regulating device 8 is used to reduce the temperature of the rolled piece 1 after rolling by the universal medium rolling mill unit 7, so that the rolled piece 1 can meet the rolling requirements of the subsequent finishing rolling process. An online water cooler, an online water mist cooler, or an air cooler is used through the first temperature regulating device 8. The first temperature regulating device 8 is configured to use an online water cooler, an online water mist cooler, or an air cooler, so that the temperature of the rolled piece 1 after rolling can be adjusted in real time, and better internal microscopic grain structure and mechanical properties of the product can be obtained, thereby improving production efficiency and product competitiveness. Online water coolers, online water mist coolers, and air coolers are prior art and will not be described in detail here.

[0104] The second shearing device 9 is used to shear the rolled piece 1 after being rolled by the universal rolling mill unit 7, so as to shear off the irregular cross section of the rolled piece 1. The second shearing device 9 can be a flying shear, a sawing machine, etc. The flying shear and the sawing machine are prior art and will not be described in detail here.

[0105] The universal finishing mill unit 10 includes two universal finishing mills arranged upstream and downstream. The structure of the universal finishing mill unit 10 is as follows: Figure 3 The universal finishing mill unit 10 is used to further roll the rolled piece 1 after being rolled by the universal intermediate rolling mill unit 7, so that the rolled piece 1 is formed into a flat steel product.

[0106] The universal finishing mill includes two horizontal rolls 21 arranged opposite to each other in the vertical direction and two vertical rolls 22 arranged opposite to each other in the horizontal direction. The two horizontal rolls 21 and the two vertical rolls 22 are combined to form a rolling hole 23 and a roll gap 24. The roll gaps 24 of the upstream and downstream adjacent universal rolling mills are staggered, and along the running direction of the rolled piece, the rolling holes 23 and / or roll gaps 24 of the first universal finishing mill in the universal finishing mill unit 10 and the universal intermediate mill adjacent to the first universal finishing mill are staggered. Both the horizontal rolls 21 and the vertical rolls are drive rolls, which are prior art and will not be described in detail here.

[0107] Please continue to refer to Figure 1 Along the rolling direction of the rolled piece 1, a second temperature regulating device 11 and a third cutting device 12 are arranged downstream of the universal finishing mill unit 10.

[0108] The second temperature regulating device 10 is used to reduce the temperature of the rolled piece 1 after rolling by the universal finishing mill unit 10, so as to adjust the internal structure of the flat steel product online by controlling the rolling and cooling process, so as to achieve the optimal mechanical properties of the product. The second temperature regulating device 10 adopts an online water cooler, an online water mist cooler, or an air cooler. By setting the second temperature regulating device 10 to adopt an online water cooler, an online water mist cooler, or an air cooler, the temperature of the rolled piece 1 after rolling can be adjusted in real time, and better internal microscopic grain structure and mechanical properties of the product can be obtained, thereby improving production efficiency and product competitiveness. Online water coolers, online water mist coolers, and air coolers are prior art and will not be described in detail here.

[0109] The third cutting device 12 is used to shear the rolled piece 1 after being rolled by the universal finishing mill unit 10, so as to cut off the irregular section of the rolled piece 1. The third cutting device 12 can be a flying shear, a sawing machine, etc. The flying shear and the sawing machine are prior arts and will not be described in detail here.

[0110] The cooling device 13 is used to cool the rolled piece 1 after being rolled by the universal finishing mill unit 10. The cooling device 13 can be a cooling bed, etc. The cooling bed is a prior art and will not be described in detail here.

[0111] Example 2

[0112] The flat steel rolling system of Example 1 is used to roll flat steel, and the specific steps are as follows:

[0113] The heating device 3 is used to heat the workpiece 1 to be rolled to 1000° C.

[0114] Then, the descaling device 4 uses high-pressure water with a pressure of 20 MPa to spray the rolled piece 1 to remove the scale (i.e., iron oxide scale) of the rolled piece 1;

[0115] Subsequently, the workpiece to be rolled, which has been heated by the heating device 3 and descaled by the descaling device 4, is preliminarily rolled by the universal rough rolling mill unit 5, the rolling temperature is 850°C, the number of rolling passes is 6, the elongation coefficient of each pass is 1.4, and the rolling line speed of the first universal rough rolling mill is 0.1 m / s along the running direction of the workpiece 1; during the rolling process, the four rolls of the same universal rough rolling mill, namely the horizontal roll 21 and the vertical roll 22, have the same line speed, and the four rolls of the same universal rough rolling mill, namely the horizontal roll 21 and the vertical roll 22, are on the same rolling surface;

[0116] Then, the first shearing device 6 is used to remove the irregular cross-section of the rolled piece 1 after preliminary rolling by the universal roughing mill unit 5.

[0117] Subsequently, the workpiece 1 sheared by the first cutting device 6 is further rolled by the universal medium rolling mill unit 7, the rolling temperature is 850°C, the rolling passes are 6, and the elongation coefficient of each pass is 1.3; during the rolling process, the four rolls of the same universal medium rolling mill, namely the horizontal roll 21 and the vertical roll 22, have the same linear speed, and the four rolls of the same universal medium rolling mill, namely the horizontal roll 21 and the vertical roll 22, are on the same rolling surface;

[0118] Then, the temperature of the rolled piece 1 is adjusted to 750° C. by the first temperature regulating device 8, and the irregular cross-section of the rolled piece 1 after being rolled by the universal medium rolling mill unit 7 is removed by the second shearing device 9;

[0119] Then, the universal finishing mill unit 10 is used to finish-roll the rolled piece 1 sheared by the second shearing device 9, the rolling temperature is 750°C, the rolling passes are 6, and the elongation coefficient of each pass is 1.2. During the rolling process, the four rolls of the same universal finishing mill, namely the horizontal roll 21 and the vertical roll 22, have the same linear speed, and the four rolls of the same universal finishing mill, namely the horizontal roll 21 and the vertical roll 22, are on the same rolling surface;

[0120] Then, the third shearing device 12 is used to remove the irregular cross-section of the rolled piece 1 after being rolled by the universal finishing mill unit 10, and the temperature of the rolled piece 1 is cooled to room temperature by a cooling device to obtain a flat steel product;

[0121] During the rolling process, the rolling line speed of the downstream rolling mill is the product of the rolling line speed of its adjacent upstream rolling mill (referring to the universal roughing mill, universal intermediate rolling mill and universal finishing mill, etc.) and the elongation coefficient of the downstream rolling mill.

[0122] Example 2

[0123] Figure 4 It is a structural schematic diagram of the flat steel rolling system of this embodiment.

[0124] like Figure 4As shown, the difference between this embodiment and the embodiment is that it also includes a pre-rolling mill 14 and a power structure 15.

[0125] The pre-rolling mill 14 is located between the heating device 3 and the universal rough rolling mill unit 5. The pre-rolling mill 14 specifically adopts a reciprocating blanking mill. The reciprocating blanking mill is a prior art and will not be described in detail here. Specifically, the pre-rolling mill 14 can perform multiple passes of reversible pre-rolling on different types of rolled products 1 to be rolled, so that the flat steel rolling system can adapt to the production requirements of different types of rolled products 1 in the incoming materials.

[0126] The power structure 15 is connected to the horizontal rollers 21 and the vertical rollers 22 of the universal rough rolling mill and / or the universal intermediate rolling mill and / or the universal finishing rolling mill. The power structure 15 can be an electric motor, a hydraulic motor, etc. The electric motor and the hydraulic motor are prior art and will not be described in detail here. By setting the power mechanism 15 connected to the horizontal rollers 21 and the vertical rollers 22 of the universal rolling mill, the shape and size of the rolling holes formed by the horizontal rollers 21 and the vertical rollers 22 can be adjusted to meet the rolling requirements of flat steels of different sizes and specifications;

[0127] The difference between this embodiment and embodiment 1 is that:

[0128] The heating device 3 is used to heat the workpiece 1 to be rolled to 1200° C.

[0129] The pressure of the high-pressure water used in the descaling device 4 is 30 MPa;

[0130] During the rolling process of the pre-rolling mill 14, the rolling temperature is 1050°C, the rolling passes are 12, the elongation coefficient of each pass is 1.45, and the rolling line speed is 0.6 m / s; during the rolling process, the four rolls of the same universal roughing mill, namely the horizontal roll 21 and the vertical roll 22, have the same line speed;

[0131] During the rolling process of the universal rough rolling mill unit 5, the rolling temperature is 1050°C, the rolling passes are 12, the elongation coefficient of each pass is 1.4, the two vertical rollers 22 of the same universal rough rolling mill are staggered 5 cm front and back, and the four rollers of the same rough rolling mill, namely the horizontal roller 21 and the vertical roller 22, are not on the same rolling surface;

[0132] During the rolling process of the universal rolling mill unit 7, the rolling temperature is 1050°C, the rolling passes are 12, the elongation coefficient of each pass is 1.35, the two vertical rollers 22 of the same universal rolling mill are staggered 5 cm front and back, and the four rollers of the same rolling mill, namely the horizontal roller 21 and the vertical roller 22, are not on the same rolling surface;

[0133] The temperature of the rolled piece 1 is adjusted to 950° C. by the first temperature regulating device 8;

[0134] During the rolling process of the universal finishing mill unit 10, the rolling temperature is 950°C, the rolling passes are 12, the elongation coefficient of each pass is 1.3, the two vertical rollers 22 of the same universal finishing mill are staggered by 5 cm front and back, and the four rollers of the same finishing mill, namely the horizontal roller 21 and the vertical roller 22, are not on the same rolling surface.

[0135] Example 3

[0136] The difference between this embodiment and embodiment 2 is that:

[0137] The heating device 3 is used to heat the workpiece 1 to be rolled to 1100° C.

[0138] The pressure of the high-pressure water used in the descaling device 4 is 25 MPa;

[0139] During the rolling process of the pre-rolling mill 14, the rolling temperature is 800°C, the rolling passes are 8, the elongation coefficient of each pass is 1.5, and the rolling line speed is 0.7 m / s;

[0140] During the rolling process of the universal rough rolling mill unit 5, the rolling temperature is 850°C, the rolling passes are 8, and the elongation coefficient of each pass is 1.4; during the rolling process, the four rollers of the same universal rough rolling mill, namely the horizontal roller 21 and the vertical roller 22, have the same linear speed;

[0141] During the rolling process of the universal medium rolling mill unit 7, the rolling temperature is 850°C, the rolling passes are 8, and the elongation coefficient of each pass is 1.3;

[0142] The temperature of the rolled piece 1 is adjusted to 820° C. by the first temperature regulating device 8;

[0143] During the rolling process of the universal finishing mill unit 10, the rolling temperature is 800° C., the rolling passes are 8, and the elongation coefficient of each pass is 1.2.

[0144] Comparative Example 1

[0145] The difference between this comparative example and Example 3 is that the two horizontal rollers 21 are driving rollers, and the two vertical rollers 22 are driven rollers.

[0146] Comparative Example 2

[0147] The difference between this comparative example and Example 3 is that the surfaces of the horizontal rolls 21 and vertical rolls 22 of all rolling mills in the universal roughing mill unit 5, the universal medium rolling mill unit 7 and the universal finishing mill unit 10 on the side adjacent to the rolling hole 23 are straight.

[0148] Comparative Example 3

[0149] The difference between this comparative example and Example 3 is that the cross-section of the surface of the side adjacent to the rolling hole 23 of the horizontal rolls 21 and vertical rolls 22 of all rolling mills in the universal roughing mill unit 5, the universal medium rolling mill unit 7 and the universal finishing mill unit 10 is arc-shaped.

[0150] Comparative Example 4

[0151] The difference between this comparative example and Example 3 is that the cross-section of the surface of the side adjacent to the rolling hole 23 of the horizontal rolls 21 and the vertical rolls 22 of all rolling mills in the universal roughing mill unit 5, the universal medium rolling mill unit 7 and the universal finishing mill unit 10 is arc-shaped, and the curvature of the cross-section of the surface of the side adjacent to the rolling hole 23 of the horizontal rolls 21 and the vertical rolls 22 of all rolling mills is the same.

[0152] Comparative Example 5

[0153] The difference between this comparative example and Example 3 is that:

[0154] During the rolling process using the pre-rolling mill 14, the rolling process using the universal rough rolling mill unit 5, the rolling process using the universal medium rolling mill unit 7, and the finishing rolling process using the universal finishing mill unit 10, the elongation coefficient of each pass is 1.45.

[0155] Comparative Example 6

[0156] The difference between this comparative example and Example 3 is that:

[0157] During the rolling process using the pre-rolling mill 14, the rolling process using the universal rough rolling mill unit 5, the rolling process using the universal medium rolling mill unit 7 and the finishing rolling process using the universal finishing mill unit 10, the elongation coefficient of each pass is 1.3.

[0158] Comparative Example 7

[0159] The difference between this comparative example and Example 3 is that:

[0160] During the rolling process of the universal roughing mill unit 5, the linear speeds of the four rolls of the first universal roughing mill (in terms of the running direction of the workpiece 1), namely the horizontal roll 21 and the vertical roll 22, are different, among which the linear speeds of the two horizontal rolls 21 and the two vertical rolls 22 are 0.91 m / s, 0.90 m / s, 0.90 m / s and 0.90 m / s respectively.

[0161] Dimensional accuracy inspection

[0162] The deviation results of the width and thickness of the flat steel obtained in Examples 1-3 and Comparative Examples 1-7 are shown in Table 1.

[0163] Table 1 Dimensional accuracy test results

[0164]

[0165] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A flat steel rolling method, characterized in that: The rolling system used includes a universal roughing mill unit, a universal medium rolling mill unit and a universal finishing mill unit arranged in sequence, and the flat steel rolling method includes: S1. Heat treatment of the rolled product; S2. rolling the heated workpiece by a universal rough rolling mill unit, wherein the universal rough rolling mill unit comprises at least two universal rough rolling mills, wherein the universal rough rolling mill comprises two horizontal rolls arranged opposite to each other in a vertical direction and two vertical rolls arranged opposite to each other in a horizontal direction, wherein the two horizontal rolls and the two vertical rolls are combined to form a rolling hole and a roll gap, and the horizontal rolls and the vertical rolls are both driven rolls; S3. Perform irregular section cutting on the rolled product after rolling by the universal roughing mill unit; S4. rolling the cut-off workpiece by a universal medium rolling mill unit, wherein the universal medium rolling mill unit comprises at least two universal medium rolling mills, wherein the universal medium rolling mill comprises two horizontal rolls arranged opposite to each other in a vertical direction and two vertical rolls arranged opposite to each other in a horizontal direction, wherein the two horizontal rolls and the two vertical rolls are combined to form a rolling hole and a roll gap, and the horizontal rolls and the vertical rolls are both driven rolls; S5. Perform irregular section cutting on the rolled piece after rolling by the universal rolling mill unit and adjust the temperature of the rolled piece; S6. rolling the rolled piece processed in step S5 by a universal finishing mill unit, wherein the universal finishing mill unit comprises at least two universal finishing mills, wherein the universal finishing mills comprise two horizontal rolls arranged opposite to each other in a vertical direction and two vertical rolls arranged opposite to each other in a horizontal direction, wherein the two horizontal rolls and the two vertical rolls are combined to form a rolling hole and a roll gap, and the horizontal rolls and the vertical rolls are both driven rolls; S7. Perform irregular section cutting on the rolled piece processed in step S6.

2. The flat steel rolling method according to claim 1, characterized in that: In step S1, the workpiece to be rolled is heated to 1000-1200°C.

3. The flat steel rolling method according to claim 1, characterized in that: In step S2, along the running direction of the rolled piece, the rolling line speed of the first universal rough rolling mill is 0.1-1 m / s; And / or, in step S2, the rolling temperature is 850-1150°C; And / or, in step S2, the rolling passes are 6-12 passes; And / or, during the rolling process in step S2, the linear speeds of the two horizontal rolls and the two vertical rolls of the same universal roughing mill are the same; And / or, in step S4, the rolling temperature is 850-1050°C; And / or, in step S4, the number of rolling passes is 6-12; And / or, during the rolling process in step S4, the linear speeds of the two horizontal rolls and the two vertical rolls of the same universal rolling mill are the same; and / or, in step S5, adjusting the temperature of the rolled piece to 750-950° C.; and / or, in step S6, the rolling temperature is 750-950° C.; and / or, in step S6, the number of rolling passes is 6-12; And / or, during the rolling process in step S6, the linear speeds of the two horizontal rolls and the two vertical rolls of the same universal finishing mill are the same.

4. The flat steel rolling method according to claim 3, characterized in that: During the rolling process in step S2, the elongation coefficient of each pass is 1.4-1.5; And / or, during the rolling process in step S4, the elongation coefficient of each pass is 1.3-1.4; And / or, during the rolling process in step S6, the elongation coefficient of each pass is 1.2-1.

3.

5. The flat steel rolling method according to claim 1, characterized in that: After step S6, a cooling step is also included to adjust the temperature of the rolled piece to 700°C to 850°C.

6. A flat steel rolling system, characterized in that: It comprises a heating device, a universal rough rolling mill unit, a first cutting device, a universal intermediate rolling mill unit, a second cutting device, a universal finishing mill unit and a cooling device which are arranged in sequence; a third cutting device is arranged downstream of the universal finishing mill unit; The universal rough rolling mill unit comprises at least two universal rough rolling mills, the universal rough rolling mills comprising two horizontal rolls arranged opposite to each other in the vertical direction and two vertical rolls arranged opposite to each other in the horizontal direction, the two horizontal rolls and the two vertical rolls are combined together to form a rolling hole, and the horizontal rolls and the vertical rolls are both driven rolls; The universal medium rolling mill unit comprises at least two universal medium rolling mills, the universal medium rolling mills comprising two horizontal rolls arranged opposite to each other in the vertical direction and two vertical rolls arranged opposite to each other in the horizontal direction, the two horizontal rolls and the two vertical rolls are combined together to form a rolling hole, and the horizontal rolls and the vertical rolls are both driven rolls; The universal finishing mill unit includes at least two universal finishing mills, and the universal finishing mill includes two horizontal rolls arranged opposite to each other in the vertical direction and two vertical rolls arranged opposite to each other in the horizontal direction. The two horizontal rolls and the two vertical rolls are combined together to form a rolling hole, and the horizontal rolls and the vertical rolls are both driven rolls.

7. The flat steel rolling system according to claim 6, characterized in that: It also includes a descaling device, which is located between the heating device and the universal finishing mill unit.

8. The flat steel rolling system according to claim 6, characterized in that: It also includes a first temperature regulating device and / or a second temperature regulating device, wherein the first temperature regulating device is located between the universal intermediate rolling mill unit and the universal finishing rolling mill unit, and the second temperature regulating device is located downstream of the universal finishing rolling mill unit.

9. The flat steel rolling system according to claim 8, characterized in that: The first temperature regulating device and / or the second temperature regulating device adopts an online water cooler or an online water mist cooler or an air cooler.

10. The flat steel rolling system according to claim 6, characterized in that: It also includes a pre-rolling mill, which is located between the heating device and the universal medium rolling mill unit; And / or, it also includes a power mechanism, which connects the horizontal rolls and vertical rolls of the universal roughing mill and / or the universal intermediate rolling mill and / or the universal finishing mill.

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