WO2011125498A1 - タンデム圧延機の動作制御方法及びこれを用いた熱延鋼板の製造方法 - Google Patents
タンデム圧延機の動作制御方法及びこれを用いた熱延鋼板の製造方法 Download PDFInfo
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- WO2011125498A1 WO2011125498A1 PCT/JP2011/056926 JP2011056926W WO2011125498A1 WO 2011125498 A1 WO2011125498 A1 WO 2011125498A1 JP 2011056926 W JP2011056926 W JP 2011056926W WO 2011125498 A1 WO2011125498 A1 WO 2011125498A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/72—Rear end control; Front end control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2265/00—Forming parameters
- B21B2265/12—Rolling load or rolling pressure; roll force
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2273/00—Path parameters
- B21B2273/12—End of product
- B21B2273/14—Front end or leading end
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
- B21B37/64—Mill spring or roll spring compensation systems, e.g. control of prestressed mill stands
Definitions
- the present invention relates to an operation control method for a tandem rolling mill and a method for producing a hot-rolled steel plate using the same.
- the present invention is, for example, an operation control method for a tandem rolling mill in which a tightening load is applied before a tip of a material to be rolled is bitten into each stand constituting a tandem finishing rolling mill of a hot rolling line, and a method using the same.
- the present invention relates to a method for manufacturing a hot-rolled steel sheet.
- each stand When rolling a material to be rolled by a tandem rolling mill having a plurality of rolling mills (stands) such as a finish rolling mill in a hot rolling line, the operation of each stand depends on the thickness of the material to be rolled and the plate on the final stand exit side. The width and the like are determined so as to satisfy the target condition.
- the operating condition of each stand is called a draft schedule (pass schedule), and greatly affects the quality and productivity of the product. Therefore, it is required to determine an appropriate draft schedule according to the product.
- the draft schedule of the tandem finish rolling mill in the hot rolling line is generally better in the surface quality of the product by reducing the surface roughness of the work roll surface as the stand closer to the final product (downstream in the moving direction of the material to be rolled). Therefore, the rolling load is determined to be light.
- the reduction ratio of the first stage (upstream side in the moving direction of the material to be rolled) stand and the second stage stand is set to be the same, the latter stage stand that rolls the material to be rolled with a small thickness requires a large rolling load. There are rolling characteristics. Therefore, in the normal draft schedule, the rolling reduction is smaller as the latter stage stand.
- steel materials used for automobiles and structural materials are required to have excellent mechanical properties such as strength, workability, and toughness.
- mechanical properties such as strength, workability, and toughness.
- the preset opening degree is nominally negative.
- the upper and lower work rolls are brought into contact (hereinafter, this state is referred to as “kiss roll”), and further, a load is applied by tightening with a reduction device, and the rolling mill is elastically deformed in advance. .
- kiss roll In normal hot rolling, it is rare that kiss roll is required and the load at that time is light, so there is no problem, but in the case of the above-mentioned fine grain steel rolling, a very large kiss roll load is generated and equipment maintenance is performed. The above problem occurs.
- the roll drive system parts are damaged by torque circulation due to a small difference in peripheral speed between the upper and lower work rolls, or if the axes of the upper and lower work rolls intersect (cross or skew) in the horizontal plane, the axis between the rolls
- the roll bearing may be damaged by directional force (hereinafter referred to as “thrust force”). These are all due to the direct contact between the upper and lower work rolls, and if a rolled material exists between them, that is, there is no problem during rolling.
- thrust force directional force
- Non-Patent Document 1 discloses a method of reducing the frictional force between rolls by applying a lubricant to the rolls during kiss rolls.
- a technique related to operation control of a rolling mill for example, in Patent Document 1, in a hot finishing rolling mill composed of a plurality of stands, a hot that expands the opening degree of at least one stand in each of the stands that are continuously provided.
- the finish rolling method when the leading end of the conveyed rolled plate reaches the work roll of the stand for changing the opening, the first step for starting the opening change of the stand and the first step starts.
- Non-Patent Document 1 if a lubricant is used, it becomes possible to reduce the thrust force due to the load applied at the time of kiss roll, and also due to a small difference in peripheral speed between the upper and lower work rolls. It is considered possible to reduce so-called torque circulation that leads to damage to drive system components.
- a lubricant that does not impair hot biting properties when used, the effect of reducing the rolling load itself by greatly reducing the friction coefficient during hot rolling is small. For this reason, when trying to manufacture fine-grained steel by increasing the rolling reduction of the rear stage stand, there is a problem that the tightening load of the stationary part exceeds the tightening load upper limit at the time of the kiss roll.
- Patent Document 1 describes a method of changing the opening degree of a rolling mill during rolling, but not the opening degree change from the kiss roll state, but the respective opening degree at the time of shifting from the kiss roll state to the steady rolling. The decision method is not stated. Therefore, it is difficult to control the operation of the tandem rolling mill from the kiss roll state using the technique disclosed in Patent Document 1, and there is a problem that the rear stage stand required for the production of the fine-grain steel plate cannot be rolled under high pressure. It was.
- the present invention provides a method for controlling the operation of a tandem rolling mill that enables high-pressure rolling at a subsequent stage of a tandem rolling mill necessary for the production of fine-grained steel, and a method for producing a hot-rolled steel sheet using the same.
- the issue is to provide.
- the first aspect of the present invention has N (N is an integer of 2 or more) stands (1, 2,..., 7), and the N ⁇ m + 1 stand before biting the material to be rolled (8).
- the rolled material (8) is rolled so as to have the outgoing side plate thickness determined in the second outgoing side plate thickness determining step, and the steady portion of the rolled material is the N ⁇ m + 1th stand ( 5) to Nth stand (7), rolled to the delivery side thickness determined in the first delivery side thickness determination step, and from the (N ⁇ m + 1) th stand (5) decided in the second delivery side thickness determination step.
- the operation control method for a tandem rolling mill is characterized in that the exit side plate thickness up to N stand (7) is thicker than the exit side plate thickness of the same stand determined in the first exit side plate thickness determining step.
- the “Nth stand (7)” means the final stand of the tandem rolling mill (10), that is, the downstream end in the moving direction of the material to be rolled (8) rolled by the tandem rolling mill (10). This refers to the stand (7) of the tandem rolling mill.
- the “first stand (1)” refers to a tandem mill stand (1) disposed at the upstream end in the moving direction of the material (8) to be rolled by the tandem mill (10).
- the front-end rolling part of a to-be-rolled material (8) means the part rolled before the rolling mill operation
- a "steady part of a to-be-rolled material (8)” means the part rolled after finishing the rolling mill operation
- the (N ⁇ m + 1) th stand (5) to the (N) th (7) exit side thickness determined in the second exit side thickness determination step is the same as the output of the same stand determined in the first exit side thickness determination step.
- Thicker than the side plate thickness means that the outlet side plate thickness of each stand from the (N ⁇ m + 1) th stand (5) to the Nth stand (7) is the outgoing side plate thickness determined in the second outgoing side plate thickness determining step. This means that it is determined to be thicker than the outlet side plate thickness determined in the first outlet side plate thickness determining step.
- the shape change of the stand (7) is predicted based on the rolling load change from the tip rolling portion to the steady portion when the material to be rolled is transferred from the tip rolling portion to the steady portion.
- the operation of the shape control means (7x, 7y) of the stand is preferably controlled based on the predicted shape change.
- the “stand shape control means (7x, 7y)” means, for example, an actuator (7x) capable of changing the cross angle of the work rolls (7a, 7a) or the work rolls (7a, 7a). ) Or the like, and an actuator represented by a roll bender device (7y) or the like that can change the bending force to be applied.
- the stand (5, 6, 7) to which a tightening load is applied in advance has two or more shape control means (5x, 5y, 6x, 6y, 7x, 7y).
- the two or more shape control means, the first shape control means (5x, 6x, 7x) and at least a second shape capable of high-speed operation at the time of transition from the tip rolling portion to the steady portion of the material to be rolled Control means (5y, 6y, 7y) are included, and the operation of the second shape control means is predicted before the transition from the tip rolling portion to the steady portion of the material to be rolled.
- the operations of the first shape control means and the second shape control means may be set so as not to exceed the allowable operation range of the shape control means.
- “high-speed operation is possible” means that the shape control means can be completed in a state where there is almost no time delay with respect to a change in rolling load accompanying a change in the rolling mill opening degree or the like. .
- the stand (5, 6, 7) to which a tightening load is applied in advance can operate at high speed at least when the material to be rolled is shifted from the tip rolling portion to the steady portion.
- the first shape control means (5z, 6z, 7z) and the second shape control means (5y, 6y, 7y) have a second shape control means when the allowable operating range of the first shape control means is exceeded. It is preferable that the operation is changed.
- the exit side plate thickness determining step (S1) further includes a tightening load in which the tightening load of the stand when the rolling of the rear end rolling portion of the material to be rolled is finished is set in advance. It is preferable to include a third exit side plate thickness determining step (S16) for determining an exit side plate thickness from the first stand (1) to the Nth stand (7) so as to be equal to or less than the load.
- the “rear end rolling portion of the material to be rolled” refers to the material (8) of the material to be rolled (8) located upstream of the steady portion of the material to be rolled (8) in the moving direction of the material to be rolled (8).
- the tail end side part refers to the material (8) of the material to be rolled (8) located upstream of the steady portion of the material to be rolled (8) in the moving direction of the material to be rolled (8).
- a steel plate (8) is rolled using a hot finish rolling mill row (20) whose operation is controlled by the operation control method for a tandem rolling mill according to the first aspect of the present invention. It is the manufacturing method of a hot-rolled steel plate characterized by having the process to do.
- the exit side plate of each stand when rolling the steady portion of the material to be rolled so that the tightening load applied in advance to the stand is equal to or less than a preset tightening load.
- a second outlet thickness determining step for determining the thickness, and the outlet thickness from the (N ⁇ m + 1) th stand to the Nth stand determined in the second outlet thickness determining step is determined by the first outlet thickness determination. It is thicker than the thickness of the determined outlet side of the same stand. Therefore, according to the 1st aspect of this invention, even if it is a case where high-pressure rolling is performed, the exit side plate
- the tightening load at the time of kiss roll is controlled to be equal to or less than the tightening load determined from the equipment maintenance aspect. It becomes possible. Therefore, by applying the first aspect of the present invention to the hot finish rolling mill row (20), it is possible to provide an operation control method for a tandem rolling mill capable of producing fine grain steel. .
- the 2nd aspect of this invention uses a hot finishing rolling mill row
- FIG. 1 is a flowchart showing an example of an operation control method for a tandem rolling mill according to the present invention (hereinafter, also referred to as “operation control method of the present invention”).
- the operation control method of the present invention shown in FIG. 1 includes an exit side plate thickness determining step (hereinafter, sometimes referred to as “S1”).
- the S1 includes a first delivery side plate thickness determination step (S11), a steady portion load prediction step (S12), an opening calculation step (S13), a tightening load prediction step (S14), and a second delivery side plate thickness. It includes a determination step (S15) and a third exit side plate thickness determination step (S16). That is, in the operation control method of the present invention, the operation of the tandem rolling mill is controlled using S1 having these steps.
- FIG. 2 is a diagram showing a form example of the tandem rolling mill 10 whose operation is controlled by the operation control method of the present invention.
- the form of the tandem rolling mill 10 is shown in a simplified manner.
- the tandem rolling mill 10 has seven stands, a first stand 1, a second stand 2,..., And a seventh stand 7, and the first stand 1 to the seventh stand 7.
- the material to be rolled 8 hereinafter, sometimes referred to as “steel plate 8”
- Each of these seven stands 1, 2,..., 7 includes a pair of work rolls and a pair of backup rolls, an actuator for changing the cross angle of the rolls, and a roll bender device for imparting bending force to the rolls.
- the first stand 1 includes a pair of work rolls 1a and 1a, a pair of backup rolls 1b and 1b, an actuator 1x and a roll bender device 1y, and the operations of the work rolls 1a and 1a and the backup rolls 1b and 1b. Is controlled via an actuator 1x and a roll bender device 1y whose operations are controlled by the control device 1c.
- the seventh stand 7 includes a pair of work rolls 7a and 7a, a pair of backup rolls 7b and 7b, an actuator 7x, and a roll bender device 7y, and the work rolls 7a and 7a and the backup rolls 7b and 7b
- the operation is controlled via an actuator 7x and a roll bender device 7y whose operations are controlled by the control device 7c.
- the control devices 1c, 2c, ..., 7c are known process computers.
- the form of S1 is not particularly limited as long as it has at least S11 and S15 described later.
- the steady portion of the steel plate 8 refers to a portion that is rolled after finishing the rolling mill operation for achieving S11.
- S11 is a step of determining the exit side plate thicknesses h1 to h7 of the first stand 1 to the seventh stand 7 when rolling the steady portion of the material 8 to be rolled, that form Is not particularly limited.
- ⁇ Second delivery thickness determination step S15> the material to be rolled is set so that the tightening load applied in advance to the stand is equal to or less than a preset tightening load. This is a step of determining the exit side plate thickness from the first stand to the N-th stand when rolling the 8 tip rolling part.
- the pre-tightening load is set to be equal to or lower than the upper limit value.
- ⁇ Third exit side plate thickness determining step S16> In the third delivery side plate thickness determination step (hereinafter sometimes referred to as “S16”), the tightening load of the stand when the rolling of the rear end rolling portion of the material to be rolled is finished is set in advance. This is a step of determining the outlet side plate thickness from the first stand to the Nth stand so as to be as follows. When rolling a material to be rolled, the kiss roll state can occur not only before the start of rolling but also after the end of rolling.
- the mill constant or plastic property when it is predicted that the tightening load applied in the kiss roll state after the end of rolling exceeds the upper limit value of the tightening load set from the viewpoint of equipment maintenance, the mill constant or plastic property
- the value of the pre-tightening load predicted in S14 is less than the upper limit value in the fifth stand 5 and the sixth stand 6, while the steel plate 8 in the case where the upper limit value is exceeded in the seventh stand 7
- the operation of the tandem rolling mill 10 for rolling is as follows, for example. First, the delivery side plate thicknesses of the first stand 1 to the 6th stand 6 become the delivery side plate thicknesses h1 to h6 of the tip rolling portion determined in S11, and the delivery side plate thickness of the seventh stand 7 is changed in S15.
- the control devices 1c to 7c are operated so that the thickness becomes h7 '(> h7), the tandem rolling mill 10 is set up, and rolling is started.
- the control device 7c is operated so that the outlet side plate thickness of the seventh stand 7 becomes the outlet side plate thickness h7 of the stationary part determined in S11 at a predetermined timing after the most advanced portion is bitten into the seventh stand 7.
- the process proceeds to rolling of the stationary part.
- the so-called absolute value AGC for calculating the output side thickness from the rolling load and the actual value of the reduction position and operating the reduction position so that the output side thickness matches the target plate thickness can be calculated. What is necessary is just to apply to a stand and change the target board thickness from h7 'to h7.
- the predetermined timing timing for operating the control device 7c
- any timing can be used as long as the seventh stand 7 bites the most advanced portion of the material to be rolled. What is necessary is just to designate in advance the time until the control device 7c is actuated after being bitten by the seventh stand 7.
- a work roll crown that is flattened under the rolling conditions of the steady part of the steel sheet is given, and the roll at the tip rolled part of the steel sheet can ensure the flatness by compensating for the rolling load difference with the steady part of the steel sheet.
- the bending force applied to the work roll was changed using a bender device.
- the bending force applied to the work roll bender may be expressed as “WRB”.
- F1 to F7 in the following table correspond to the first stand 1 to the seventh stand 7, respectively.
- ⁇ Embodiment 1> Assuming a case where a fine-grained steel is manufactured through a process of rolling a steel plate 8 having a plate thickness of 32 mm and a plate width of 1000 mm before being rolled by the first stand 1 using a tandem rolling mill 10, the steady portion is rolled.
- the outgoing side plate thicknesses h1 to h7 were determined in S11.
- the determined delivery side plate thickness [mm] is applied to the rolling load [MN] applied to the steady part of the material to be rolled, WRB [kN / ch] when rolling the tip, the reduction position [mm], to the stand Table 1 shows the applied tightening load [MN] and the limit load [MN] during kiss roll.
- the reduction position means the vertical position of the tightening load applying means in which the position at the time of kiss roll of the stand to which no load is applied is zero, and the tightening load is larger than when the reduction position is zero. Then, the value of the reduction position becomes negative.
- “/ Ch” means “per chock”. The same applies to the following.
- the tightening load of the seventh stand 7 was 17.28MN, which exceeded the limit load of 12.74MN when the seventh stand 7 was kiss-rolled. Therefore, if a tightening load is applied to the seventh stand 7 in advance according to the draft schedule determined in S11, the seventh stand 7 may be damaged. Accordingly, in S15, the exit side plate thicknesses h1 to h6 maintain the values determined in S11, but are larger than the exit side plate thickness h7 so that the tightening load applied to the seventh stand 7 is less than the limit load.
- the delivery side plate thickness h7 ′ was determined.
- the delivery side plate thicknesses h1 to h7 ′ [mm] determined in S15 are the rolling load [MN] applied to the steady portion of the material to be rolled, WRB [kN / ch] when rolling the tip, and the reduction position [ mm], the tightening load [MN] applied to the stand, and the limit load [MN] during kiss roll are shown in Table 2.
- Second Embodiment Assuming a case where a fine grain steel is manufactured through a process of rolling a steel plate 8 having a plate thickness of 38 mm and a plate width of 1500 mm before being rolled by the first stand 1 using a tandem rolling mill 10, the steady portion is rolled.
- the outgoing side plate thicknesses h1 to h7 were determined in S11.
- the determined delivery side plate thickness [mm] is applied to the rolling load [MN] applied to the steady part of the material to be rolled, WRB [kN / ch] when rolling the tip, the reduction position [mm], to the stand Table 3 shows the tightening load [MN] applied and the limit load [MN] during kiss roll.
- the tightening load of the seventh stand 7 was 14.90MN, exceeding the limit load of 12.74MN when the seventh stand 7 was kiss-rolled. Therefore, if a tightening load is applied to the seventh stand 7 in advance according to the draft schedule determined in S11, the seventh stand 7 may be damaged. Accordingly, in S15, the exit side plate thicknesses h1 to h6 maintain the values determined in S11, but are larger than the exit side plate thickness h7 so that the tightening load applied to the seventh stand 7 is less than the limit load.
- the delivery side plate thickness h7 ′ was determined.
- the delivery side plate thicknesses h1 to h7 ′ [mm] determined in S15 are set to the rolling load [MN] applied to the steady portion of the material to be rolled, WRB [kN / ch] when rolling the tip, and the reduction position [ mm], the tightening load [MN] applied to the stand, and the limit load [MN] during kiss roll are shown in Table 4.
- the tightening load of the seventh stand 7 is 12.72 MN which is smaller than the limit load 12.74 MN. I was able to. Therefore, like the operation control method of the present invention according to the first embodiment, according to the operation control method of the present invention according to the second embodiment, the fifth stand 5 to the seventh stand for producing fine-grained steel. Even when high-pressure rolling is performed at 7, it is possible to prevent breakage of each stand.
- ⁇ Third Embodiment> Assuming a case where a fine-grained steel is manufactured through a process of rolling a steel plate 8 having a plate thickness of 32 mm and a plate width of 1300 mm before being rolled by the first stand 1 using a tandem rolling mill 10, the steady portion is rolled.
- the outgoing side plate thicknesses h1 to h7 were determined in S11.
- the determined delivery side plate thickness [mm] is applied to the rolling load [MN] applied to the steady part of the material to be rolled, WRB [kN / ch] when rolling the tip, the reduction position [mm], to the stand Table 5 shows the tightening load [MN] to be applied and the limit load [MN] at the time of kiss roll.
- the tightening load of the sixth stand 6 is 19.49MN
- the tightening load of the seventh stand 7 is 25.41MN.
- the critical load of 12.74 MN at 7 and the critical load of 12.74 MN when the seventh stand 7 was kiss-rolled were exceeded. Therefore, if a tightening load is applied in advance to the sixth stand 6 and the seventh stand 7 in accordance with the draft schedule determined in S11, the sixth stand 6 and the seventh stand 7 may be damaged. Accordingly, in S15, the exit side plate thicknesses h1 to h5 maintain the values determined in S11 so that the tightening load applied to the sixth stand 6 and the seventh stand 7 is equal to or less than the limit load.
- An exit side plate thickness h6 ′ larger than the thickness h6 and an exit side plate thickness h7 ′ larger than the exit side plate thickness h7 were determined.
- the delivery side plate thicknesses h1 to h7 ′ [mm] determined in S15 are set to the rolling load [MN] applied to the steady portion of the material to be rolled, WRB [kN / ch] when rolling the tip, and the reduction position [ mm], the tightening load [MN] applied to the stand, and the limit load [MN] during kiss roll are shown in Table 6.
- ⁇ Fourth embodiment> Assuming a case where a fine-grained steel is manufactured through a process of rolling a steel plate 8 having a plate thickness of 32 mm and a plate width of 1000 mm before being rolled by the first stand 1 using a tandem rolling mill 10, the steady portion is rolled.
- the outgoing side plate thicknesses h1 to h7 were determined in S11.
- the determined delivery side plate thickness [mm] is applied to the rolling load [MN] applied to the steady part of the material to be rolled, WRB [kN / ch] when rolling the tip, the reduction position [mm], to the stand Table 7 shows the tightening load [MN] to be applied and the limit load [MN] at the time of kiss roll.
- the tightening load of the sixth stand 6 is 15.58MN
- the tightening load of the seventh stand 7 is 23.18MN.
- the limit load of 12.74 MN at the time of kiss roll of the seventh stand 7 was exceeded. Therefore, if a tightening load is applied in advance to the sixth stand 6 and the seventh stand 7 in accordance with the draft schedule determined in S11, the sixth stand 6 and the seventh stand 7 may be damaged. Accordingly, in S15, the exit side plate thicknesses h1 to h5 maintain the values determined in S11 so that the tightening load applied to the sixth stand 6 and the seventh stand 7 is equal to or less than the limit load.
- An exit side plate thickness h6 ′ larger than the thickness h6 and an exit side plate thickness h7 ′ larger than the exit side plate thickness h7 were determined.
- the delivery side plate thicknesses h1 to h7 ′ [mm] determined in S15 are set to the rolling load [MN] applied to the steady portion of the material to be rolled, WRB [kN / ch] when rolling the tip, and the reduction position [ mm], the tightening load [MN] applied to the stand, and the limit load [MN] during kiss roll are shown in Table 8.
- shape control means for example, actuators 5x, 6x, 7x and bender devices 5y, 6y, 7y, etc.
- shape control means for example, actuators 5x, 6x, 7x and bender devices 5y, 6y, 7y, etc.
- the shape of the sensor feedback method is used in order to change the exit side plate thickness (for example, change from h7 ′ to h7) and change the tightening load within a short time after the rolling of the tip rolling portion. Control may not be in time. Therefore, in the operation control method of the present invention, it is preferable to change the operation of the shape control means while monitoring the tightening load.
- the bender device 5y , 6y, 7y necessary control amounts are predicted in advance, and shape control means is used so that the control amounts of the bender devices 5y, 6y, 7y do not become out of range when changing from the tip rolled portion to the steady portion of the steel plate 8. It is preferable to perform the initial setting.
- the operation speed of the shape control means such as the actuators 5x, 6x, 7x can be followed.
- the flatness of the steel plate 8 may be ensured by changing the distribution of the control amounts of the actuators 5x, 6x, and 7x and the control amounts of the bender devices 5y, 6y, and 7y.
- the control amounts of the bender devices 5x, 6x, and 7x are expected to exceed the range, the control amounts of the actuators 5x, 6x, and 7x are set so that the control amounts of the bender devices 5x, 6x, and 7x do not exceed the range. It is only necessary to ensure the flatness of the steel plate 8 by changing.
- FIG. 3 is a diagram showing an example of a form of a hot-rolled steel sheet production line 100 provided with a finish rolling mill row 20 whose operation is controlled by the operation control method of the present invention.
- the hot-rolled steel sheet production line 100 includes a rough rolling mill row 30 including rough rolling mills 30 a, 30 b,..., 30 f and a finishing rolling mill including finishing rolling mills 20 a, 20 b,. Row 20.
- the finish rolling mill row 20 has seven stands from the first stand 20a to the seventh stand 20g, and the operation of the finish rolling mill row 20 is controlled through S1 having S11 to S16. Therefore, the finishing rolling mill row 20 has, for example, a reduction ratio of the subsequent three stands (the fifth stand 20e, the sixth stand 20f, and the seventh stand 20g) when producing a steel plate other than the ultrafine-grained steel.
- the operation can be performed in a form higher than the rolling reduction, which makes it possible to greatly deform the austenite grains of the steel plate 8 and increase the dislocation density.
- the operation control method of the present invention it becomes possible to produce fine-grained steel. From the above, according to the present invention, it is possible to provide an operation control method for a tandem rolling mill capable of producing fine-grained steel, and a method for producing a hot-rolled steel sheet capable of producing fine-grained steel. it can.
- the average linear pressure of the rolling load of the rear stage stand for the production of fine-grained steel is a value obtained by dividing the steady portion rolling load shown in Table 1, Table 3, Table 5, and Table 7 by the plate width, and is 20 MN / The value exceeds m.
- This is a higher load than the rolling load of the conventional normal draft schedule.
- a steel plate having a plate thickness of 32 mm and a plate width of 1000 mm before being rolled by the first stand 1 was rolled by a tandem rolling mill having 7 stands.
- the rolling conditions were Condition 1 to Condition 4 shown in Table 9 below.
- condition 1 rolling was performed with the settings shown in Table 2 for the tip rolled portion and the settings shown in Table 1 for the stationary portion.
- the target plate thickness could be achieved in the steady portion by lowering the opening of the seventh stand until the setting shown in Table 1.
- the bending force applied to the work roll bender which is a shape control means capable of high-speed operation while monitoring the load of the seventh stand, is changed from 392 kN / ch shown in Table 2 to 980 kN / ch shown in Table 1.
- the operation of the tandem rolling mill can be controlled from the kiss roll state, and fine grain steel can be manufactured.
- condition 3 after rolling the tip rolling portion with the set value shown in Table 2, the opening degree of the rolling mill was changed to the set value shown in Table 1, but the WRB was changed to the value shown in Table 2. However, the rolling mill did not break, but the shape defect of the rolled material increased at the steady part, and the product value was lost.
- condition 4 the opening setting shown in Table 2 was set, and WRB was set to the value shown in Table 1.
- the coil tip was caught on the exit side of the rolling mill.
- the coiling device installed behind the rolling mill could not be reached and the rolling mill had to be stopped.
- the operation control method for a tandem rolling mill and the method for producing a hot-rolled steel sheet according to the present invention can be used for producing a hot-rolled steel sheet having fine crystal grains.
- the hot-rolled steel sheet having fine crystal grains can be used as a material used for applications such as automobiles, household appliances, machine structures, and buildings.
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Abstract
Description
また、特に圧延時の変形抵抗が大きい硬質材で高圧下圧延を行う場合には圧延荷重が著しく大きくなり、圧延機の弾性変形による上下ワークロール間のギャップ(以下において、「圧延機開度」という。)も大きくなる。その結果、狙いの出側板厚を得るために、すなわち圧延荷重負荷状態での圧延機開度を狙い板厚に合わせるために、圧延荷重負荷前の開度を予め小さく設定しておく必要が生じ、圧延荷重が大きくかつ狙い板厚が小さい場合には、事前の設定開度は名目上マイナスとなる。実際には上下ワークロールを接触させた上で(以下において、この状態を「キスロール」という。)さらに圧下装置で締め込んで荷重を付与し、圧延機を事前に弾性変形させておくことになる。通常の熱間圧延においてはキスロールを要すること自体が稀でかつその際の荷重も軽微であるため問題は生じないが、上述の微細粒鋼圧延の場合には極めて大きなキスロール荷重が生じ、設備保全上の問題が生じる。例えば上下ワークロールの微小な周速差に起因するトルク循環でロール駆動系部品が破損したり、上下ワークロールの軸を水平面内で交差(クロスあるいはスキュー)させている場合にはロール間の軸方向力(以下「スラスト力」と呼ぶ)でロール軸受が破損したりする。これらはいずれも上下のワークロールが直接接触することによるもので、間に圧延材が存在すれば、すなわち圧延中は問題にはならない。
圧延機を保護するためにはキスロールが生じてもトルク循環やスラスト力を抑制する手段を講じるか、キスロール荷重そのものを軽減する必要がある。しかしキスロール荷重を軽減するために事前締め込みを制限すれば、狙いの板厚を得ることはできないため、特殊な圧延機の動作制御が必要になる。
S1は、第1スタンドから第Nスタンドまで(Nは2以上の整数)の各スタンドの出側板厚をそれぞれ決定する工程である。すなわち、N=7及びm=3である場合、S1は、第1スタンド1から第7スタンド7までの7スタンドの出側板厚をそれぞれ決定する工程である。本発明の動作制御方法において、S1は、少なくとも後述するS11及びS15を有していれば、その形態は特に限定されるものではない。
第1出側板厚決定工程(以下において、「S11」ということがある。)は、被圧延材の定常部を圧延するときの第1スタンドから第Nスタンドの出側板厚を決定する工程である。すなわち、N=7である場合、S11は、鋼板8の定常部を圧延するときの第1スタンド1から第7スタンド7の出側板厚h1~h7を決定する工程、とすることができる。本発明の動作制御方法において、鋼板8の定常部とは、S11を達成するための圧延機動作を終えた後に圧延される部分をいう。
定常部負荷予測工程(以下において、「S12」ということがある。)は、上記S11で決定した出側板厚となるように第1スタンドから第Nスタンドを作動させた場合に、被圧延材の定常部へと付与される負荷を予測する工程である。すなわち、N=7である場合、S12は、上記S11で決定した出側板厚h1~h7となるように第1スタンド1から第7スタンド7を作動させた場合に、鋼板8の定常部へと付与される負荷を予測する工程、とすることができる。S12における予測結果は、後述する開度計算工程で使用される。
開度計算工程(以下において、「S13」ということがある。)は、上記S12で予測された負荷に基づいて、被圧延材の定常部を圧延するときの第1スタンドから第Nスタンドまでの圧延機開度(ロールギャップ)を計算する工程である。すなわち、N=7である場合、S13は、上記S12で予測された負荷に基づいて、鋼板8の定常部を圧延するときの第1スタンド1から第7スタンド7までの圧延機開度を計算する工程、とすることができる。
締め込み荷重予測工程(以下において、「S14」ということがある。)は、上記S13で計算された開度と締め込み荷重との関係を考慮しながら、第N-m+1スタンドから第Nスタンドまでの各スタンドに事前に付与される締め込み荷重を予測する工程である。すなわち、N=7及びm=3である場合、S14は、上記S13で計算された開度と締め込み荷重との関係を考慮しながら、第5スタンド5から第7スタンド7までの各スタンドに事前に付与される締め込み荷重を予測する工程、とすることができる。
第2出側板厚決定工程(以下において、「S15」ということがある。)は、スタンドへと事前に付与される締め込み荷重が予め設定された締め込み荷重以下となるように、被圧延材8の先端圧延部を圧延するときの第1スタンドから第Nスタンドまでの出側板厚を決定する工程である。第N-m+1スタンドから第Nスタンドまでの各スタンドへ事前に(キスロール時に)付与される締め込み荷重が、設備保全面から設定される締め込み荷重の上限値を超える場合、各スタンドの圧延機開度設定値を維持したまま事前に締め込み荷重を付与すると、減速機や圧延ロール等が破損する虞がある。そこで、本発明の動作制御方法では、上記S14で予測された事前締め込み荷重が設備保全面から設定される締め込み荷重の上限値を超える場合には、ミル定数や塑性特性を考慮しながらS14における予測値が上限値を超えたスタンドの出側板厚がS11で決定された出側板厚よりも厚くなるように変更して、上限値を超えたスタンドの圧延機開度設定値を大きくすることにより、事前締め込み荷重が上限値以下になるようにする。このようにすることで、高圧下圧延を行った場合であっても、各スタンドの破損を防止して圧延を行うことが可能になる。本発明の動作制御方法において、被圧延材8の先端圧延部とは、S11を達成するための圧延機動作が始まる前に圧延されている部分をいう。
第3出側板厚決定工程(以下において、「S16」ということがある。)は、被圧延材の後端圧延部の圧延が終了したときのスタンドの締め込み荷重が予め設定された締め込み荷重以下となるように、第1スタンドから第Nスタンドまでの出側板厚を決定する工程である。被圧延材を圧延する場合、キスロール状態は、圧延開始前のみならず、圧延終了後にも生じ得る。そこで、S16では、圧延終了後のキスロール状態のときに付与される締め込み荷重が設備保全面から設定される締め込み荷重の上限値を超えることが予想される場合には、ミル定数や塑性特性を考慮しながら、上限値を超えたスタンドの出側板厚がS11で決定された出側板厚よりも厚くなるように、被圧延材の後端圧延部を圧延する際のスタンドの圧延機開度設定値を大きくするように設定を変更する。S16を有することにより、各スタンドの設備保全が容易になる。
第1スタンド1によって圧延される前の板厚が32mm、板幅が1000mmである鋼板8をタンデム圧延機10によって圧延する過程を経て微細粒鋼を製造する場合を想定し、定常部を圧延するときの出側板厚h1~h7をS11で決定した。決定した出側板厚[mm]を、被圧延材の定常部へと付与される圧延荷重[MN]、先端部を圧延する際のWRB[kN/ch]、圧下位置[mm]、スタンドへと付与される締め込み荷重[MN]、及び、キスロール時の限界荷重[MN]とともに、表1に示す。ここに、圧下位置とは、負荷が付与されていないスタンドのキスロール時の位置をゼロとする、締め込み荷重付与手段の垂直方向位置をいい、圧下位置がゼロの時よりも締め込み荷重を大きくすると圧下位置の値はマイナスになる。以下においても同様である。また、「/ch」は、「チョックあたり」という意味である。以下においても同様である。
第1スタンド1によって圧延される前の板厚が38mm、板幅が1500mmである鋼板8をタンデム圧延機10によって圧延する過程を経て微細粒鋼を製造する場合を想定し、定常部を圧延するときの出側板厚h1~h7をS11で決定した。決定した出側板厚[mm]を、被圧延材の定常部へと付与される圧延荷重[MN]、先端部を圧延する際のWRB[kN/ch]、圧下位置[mm]、スタンドへと付与される締め込み荷重[MN]、及び、キスロール時の限界荷重[MN]とともに、表3に示す。
第1スタンド1によって圧延される前の板厚が32mm、板幅が1300mmである鋼板8をタンデム圧延機10によって圧延する過程を経て微細粒鋼を製造する場合を想定し、定常部を圧延するときの出側板厚h1~h7をS11で決定した。決定した出側板厚[mm]を、被圧延材の定常部へと付与される圧延荷重[MN]、先端部を圧延する際のWRB[kN/ch]、圧下位置[mm]、スタンドへと付与される締め込み荷重[MN]、及び、キスロール時の限界荷重[MN]とともに、表5に示す。
第1スタンド1によって圧延される前の板厚が32mm、板幅が1000mmである鋼板8をタンデム圧延機10によって圧延する過程を経て微細粒鋼を製造する場合を想定し、定常部を圧延するときの出側板厚h1~h7をS11で決定した。決定した出側板厚[mm]を、被圧延材の定常部へと付与される圧延荷重[MN]、先端部を圧延する際のWRB[kN/ch]、圧下位置[mm]、スタンドへと付与される締め込み荷重[MN]、及び、キスロール時の限界荷重[MN]とともに、表7に示す。
以上より、本発明によれば、微細粒鋼を製造することが可能なタンデム圧延機の動作制御方法、及び、微細粒鋼を製造することが可能な熱延鋼板の製造方法を提供することができる。
1x…アクチュエータ
1y…ベンダー装置
2…第2スタンド
2x…アクチュエータ
2y…ベンダー装置
3…第3スタンド
3x…アクチュエータ
3y…ベンダー装置
4…第4スタンド
4x…アクチュエータ
4y…ベンダー装置
5…第5スタンド
5x…アクチュエータ
5y…ベンダー装置
6…第6スタンド
6x…アクチュエータ
6y…ベンダー装置
7…第7スタンド
7x…アクチュエータ
7y…ベンダー装置
8…被圧延材(鋼板)
10…タンデム圧延機
20…仕上圧延機列
30…粗圧延機列
100…熱延鋼板の製造ライン
Claims (6)
- N個(Nは2以上の整数)のスタンドを有し、被圧延材を噛み込む前の第N-m+1スタンド(mは1以上N以下の整数)から第Nスタンドまでの各スタンドに事前に締め込み荷重が付与されるタンデム圧延機の動作を制御する方法であって、
第1スタンドから第Nスタンドまでの各スタンドの出側板厚を決定する出側板厚決定工程を有し、該出側板厚決定工程は、前記被圧延材の定常部を圧延するときの前記第1スタンドから前記第Nスタンドまでの出側板厚を決定する第1出側板厚決定工程、及び、前記スタンドへと事前に付与される締め込み荷重が予め設定された締め込み荷重以下となるように、前記被圧延材の先端圧延部を圧延するときの前記第1スタンドから前記第Nスタンドまでの出側板厚を決定する第2出側板厚決定工程、を含み、
少なくとも前記被圧延材の最先端部が前記各スタンドに噛み込まれるまでは、前記第2出側板厚決定工程で決定した出側板厚となるように前記被圧延材が圧延されるとともに、前記被圧延材の定常部は、前記第N-m+1スタンドから前記第Nスタンドによって、前記第1出側板厚決定工程で決定した出側板厚へと圧延され、
前記第2出側板厚決定工程で決定された前記第N-m+1スタンドから前記第Nスタンドまでの出側板厚は、前記第1出側板厚決定工程で決定された同じスタンドの出側板厚よりも厚いことを特徴とする、タンデム圧延機の動作制御方法。 - 前記被圧延材の先端圧延部から定常部への移行にあたって、前記先端圧延部から前記定常部への圧延荷重変化に基づいてスタンドの形状変化が予測され、予測された形状変化に基づいて前記スタンドの形状制御手段の動作が制御されることを特徴とする、請求項1に記載のタンデム圧延機の動作制御方法。
- 事前に締め込み荷重を付与されるスタンドが、2以上の形状制御手段を有し、
前記2以上の形状制御手段に、第1形状制御手段、及び、少なくとも前記被圧延材の先端圧延部から定常部への移行時に高速動作可能な第2形状制御手段、が含まれ、
前記被圧延材の先端圧延部から定常部へと移行する前に、前記第2形状制御手段の動作が予測され、
予測結果に基づいて、前記第2形状制御手段の許容動作範囲を超えないように、前記第1形状制御手段及び前記第2形状制御手段の動作が設定されることを特徴とする、請求項1又は2に記載のタンデム圧延機の動作制御方法。 - 事前に締め込み荷重を付与されるスタンドが、少なくとも前記被圧延材の先端圧延部から定常部への移行時に高速動作可能な第1形状制御手段及び第2形状制御手段を有し、前記第1形状制御手段の許容動作範囲を超えた場合には、前記第2形状制御手段の動作が変更されることを特徴とする、請求項1又は2に記載のタンデム圧延機の動作制御方法。
- 前記出側板厚決定工程が、さらに、前記被圧延材の後端圧延部の圧延が終了したときの前記スタンドの締め込み荷重が予め設定された締め込み荷重以下となるように、前記第1スタンドから前記第Nスタンドまでの出側板厚を決定する第3出側板厚決定工程、を含むことを特徴とする、請求項1~4のいずれか1項に記載のタンデム圧延機の動作制御方法。
- 請求項1~5のいずれか1項に記載のタンデム圧延機の動作制御方法によって動作を制御される熱間仕上圧延機列を用いて鋼板を圧延する工程を有することを特徴とする、熱延鋼板の製造方法。
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JPS5691918A (en) * | 1979-12-27 | 1981-07-25 | Mitsubishi Electric Corp | Load redistribution controller for continuous rolling mill |
JPH04266185A (ja) | 1991-02-21 | 1992-09-22 | Nec Corp | 文字のライン化方式 |
JPH05200420A (ja) * | 1992-01-28 | 1993-08-10 | Toshiba Corp | マットロール圧延用板厚制御装置 |
US5609053A (en) * | 1994-08-22 | 1997-03-11 | Alcan Aluminum Corporation | Constant reduction multi-stand hot rolling mill set-up method |
JP2000167612A (ja) * | 1998-12-04 | 2000-06-20 | Toshiba Corp | 圧延機の最適パススケジュール決定方法及び装置 |
JP2000312909A (ja) * | 1999-04-27 | 2000-11-14 | Toshiba Corp | 板幅制御装置 |
JP3413181B2 (ja) * | 2001-08-03 | 2003-06-03 | 川崎重工業株式会社 | 連続熱間圧延設備 |
EP1485216B1 (de) * | 2002-03-15 | 2005-10-26 | Siemens Aktiengesellschaft | Rechnergestütztes ermittlungsverfahren für sollwerte für profil- und planheitsstellglieder |
FR2887480B1 (fr) * | 2005-06-23 | 2007-09-21 | Vai Clecim Soc Par Actions Sim | Procede et dispositif de regulation de l'epaisseur d'un produit lamine en sortie d'une installation de laminage en tandem |
JP4834623B2 (ja) * | 2007-07-26 | 2011-12-14 | 株式会社神戸製鋼所 | タンデム圧延装置におけるパススケジュール決定方法 |
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- 2011-03-23 EP EP11765399.8A patent/EP2556903B1/en active Active
- 2011-03-23 CN CN201180017039.9A patent/CN102821884B/zh active Active
- 2011-03-23 WO PCT/JP2011/056926 patent/WO2011125498A1/ja active Application Filing
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JPH08206712A (ja) * | 1995-01-31 | 1996-08-13 | Toshiba Corp | 走間板厚変更時のパススケジュール決定方法 |
JP2005319495A (ja) * | 2004-05-11 | 2005-11-17 | Kobe Steel Ltd | 熱間仕上圧延方法および熱間仕上圧延材 |
JP4266185B2 (ja) | 2004-05-11 | 2009-05-20 | 株式会社神戸製鋼所 | 熱間仕上圧延方法および熱間仕上圧延材 |
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See also references of EP2556903A4 |
Also Published As
Publication number | Publication date |
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EP2556903A4 (en) | 2014-09-24 |
US20130019646A1 (en) | 2013-01-24 |
US8850860B2 (en) | 2014-10-07 |
TWI486218B (zh) | 2015-06-01 |
CN102821884B (zh) | 2014-07-02 |
CN102821884A (zh) | 2012-12-12 |
BR112012024631A2 (pt) | 2016-06-07 |
KR101404347B1 (ko) | 2014-06-09 |
KR20120130008A (ko) | 2012-11-28 |
JP4801782B1 (ja) | 2011-10-26 |
JP2011218377A (ja) | 2011-11-04 |
BR112012024631A8 (pt) | 2017-10-03 |
EP2556903B1 (en) | 2016-05-11 |
EP2556903A1 (en) | 2013-02-13 |
TW201206583A (en) | 2012-02-16 |
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