JP5999019B2 - Width reduction equipment and width reduction method - Google Patents

Description

  The present invention relates to a width reduction facility and a width reduction method for reducing the width of a rolled metal material (hereinafter referred to as a material to be rolled).

  Conventionally, in order to make the width of a steel slab manufactured by continuous casting according to a requirement at the time of hot rolling, a width reduction facility for reducing the width of the steel slab is installed in the hot rolling line. Generally, the width reduction equipment includes a pair of press dies facing in the width direction of the steel slab and a pinch roll that conveys the steel slab along a conveyance path passing between the pair of press dies. The width reduction equipment intermittently conveys the steel slab by a certain conveyance amount along the conveyance path by the rotation operation of the pinch roll. In parallel with this, the width reduction equipment reciprocates the pair of press dies in the width direction of the steel slab with an electric motor so as to sandwich the steel slab from the width direction, thereby reducing the width of the steel slab. The width reduction equipment sequentially transfers the steel slab for such a constant conveyance amount and the width reduction over the entire area (full length) in the longitudinal direction of the steel slab. As a result, the width of one steel slab is reduced. Finish.

  The width reduction equipment performs conveyance and width reduction of the steel slab for the above-mentioned constant conveyance amount with respect to each steel slab in the hot rolling line. In this way, the width reduction facility reduces the width of each steel slab to a width as required. As a result, the width of each steel slab is aggregated for each product request width.

  In addition, as a conventional technique related to the width reduction of the steel slab as described above, for example, while the steel slab is intermittently conveyed by a pinch roll while minimizing the meandering phenomenon of the steel slab using a slab rear end side guide mechanism, There is a type in which a steel slab is width-reduced to a predetermined width by a width-reducing mold (see Patent Document 1).

JP 2001-269701 A

  However, in the above-described conventional technology, since it takes a long time to reduce the width of one steel slab, it is difficult to efficiently reduce the width of each steel slab in the hot rolling line. This hindered the efficiency of the entire hot rolling process of the steel slab by the hot rolling line, resulting in a decrease in the efficiency of the entire hot rolling process.

  The present invention has been made in view of the above circumstances, and can reduce the time required for width reduction of a rolled material such as a steel slab, whereby each rolled material in a hot rolling line can be efficiently obtained. An object of the present invention is to provide a width reduction facility and a width reduction method capable of improving the efficiency of the entire hot rolling process by width reduction.

  In order to solve the above-described problems and achieve the object, the width reduction equipment according to the present invention has a pair of press dies opposed to the width direction of the material to be rolled, and the width direction of the material to be rolled A width reduction device that presses the pair of press dies against the material to be rolled to reduce the width of the material to be rolled, a conveyance device that conveys the material to be rolled so as to pass between the pair of press dies, When the width of the material to be rolled is reduced, a maximum conveyance amount of the material to be rolled that satisfies the allowable torque or less allowed by the width reduction device is set according to the width reduction amount of the material to be rolled, And a control unit that controls the amount of conveyance of the material to be rolled per width reduction to the maximum amount of conveyance.

  Further, in the width reduction facility according to the present invention, in the above invention, the control unit derives a target maximum conveyance amount for each width reduction of the material to be rolled according to the width reduction amount of the material to be rolled, When an estimated torque required for the width reduction device when the material to be rolled for the target maximum conveyance amount is reduced, and the estimated torque is equal to or less than the allowable torque, the target maximum conveyance amount is set as the maximum conveyance amount. Is set to control the conveyance amount for each width reduction of the material to be rolled to the target maximum conveyance amount.

  In the width reduction facility according to the present invention, in the above invention, when the estimated torque exceeds the allowable torque, the control unit sets the target maximum conveyance amount until the estimated torque becomes equal to or less than the allowable torque. The target maximum conveyance amount after reduction is set as the maximum conveyance amount, and the conveyance amount for each width reduction of the material to be rolled is controlled to the target maximum conveyance amount after reduction.

  Further, the width reduction facility according to the present invention is the above-described invention, wherein the width reduction amount of the material to be rolled, the pair of press dies and the material to be rolled in the width reduction of the material to be rolled of the width reduction amount. A storage unit that stores a correlation data table indicating a correlation with the maximum transport amount of the material to be rolled that can avoid inadvertent contact with the control unit, and the control unit is configured to store the inadequate data based on the correlation data table. The target maximum conveyance amount capable of avoiding the ready contact is derived.

  Further, the width reduction method according to the present invention is configured to convey the material to be rolled so as to pass between a pair of press dies facing the width direction of the material to be rolled, and from the width direction of the material to be rolled. In a width reduction method of pressing the pair of press dies against the rolled material to reduce the width of the material to be rolled, the tolerance allowed to the drive source of the pair of press dies when the material to be rolled is reduced in width. A conveyance amount control step of setting a maximum conveyance amount of the material to be rolled that satisfies a torque or less according to a width reduction amount of the material to be rolled, and controlling a conveyance amount for each width reduction of the material to be rolled to the maximum conveyance amount. It is characterized by including.

  Further, the width reduction method according to the present invention, in the above invention, a conveyance amount derivation step for deriving a target maximum conveyance amount for each width reduction of the material to be rolled according to the width reduction amount of the material to be rolled, An estimated torque calculating step for calculating an estimated torque required for the drive source of the pair of press dies when the workpiece is reduced in width by a target maximum conveyance amount, and whether the estimated torque is equal to or less than the allowable torque A determination step of determining whether or not the conveyance amount control step sets the target maximum conveyance amount as the maximum conveyance amount and sets the width of the material to be rolled when the estimated torque is equal to or less than the allowable torque. The conveyance amount for each reduction is controlled to the target maximum conveyance amount.

  In the width reduction method according to the present invention, in the above invention, when the estimated torque exceeds the allowable torque, the conveyance amount reduction that reduces the target maximum conveyance amount until the estimated torque becomes equal to or less than the allowable torque. The transport amount control step further includes a step of setting the target maximum transport amount after reduction as the maximum transport amount and reducing the transport amount for each width reduction of the rolled material to the target maximum transport amount after reduction. It is characterized by controlling.

  In the width reduction method according to the present invention, in the above invention, the conveyance amount derivation step includes the width reduction amount of the material to be rolled, and the pair of presses in the width reduction of the material to be rolled of the width reduction amount. The target maximum conveyance that can avoid the inadvertent contact based on the correlation data table that shows the correlation with the maximum conveyance amount of the material to be rolled that can avoid the inadvertent contact between the mold and the material to be rolled. It is characterized by deriving a quantity.

  According to the present invention, it is possible to reduce the time required for the width reduction of the rolled material such as a steel slab, thereby efficiently reducing the width of each rolled material in the hot rolling line and improving the efficiency of the entire hot rolling process. The effect that can be improved.

Drawing 1 is a mimetic diagram showing an example of 1 composition of width reduction equipment concerning an embodiment of the invention. FIG. 2 is a diagram showing an example of the correlation between the width reduction amount of the material to be rolled and the maximum conveyance amount of the material to be rolled that satisfies the allowable torque or less during width reduction. FIG. 3 is a diagram for explaining the width reduction amount and the conveyance amount of the material to be rolled in the present embodiment. FIG. 4 is a flowchart showing an example of the width reduction method according to the embodiment of the present invention. FIG. 5 is a diagram for explaining the increase / decrease in the transport amount of the material to be rolled accompanying the increase / decrease in the width reduction amount of the material to be rolled.

  Hereinafter, preferred embodiments of a width reduction facility and a width reduction method according to the present invention will be described in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiment.

(Embodiment)
First, the structure of the width reduction equipment concerning embodiment of this invention is demonstrated. Drawing 1 is a mimetic diagram showing an example of 1 composition of width reduction equipment concerning an embodiment of the invention. The width reduction equipment 1 according to the present embodiment is for reducing the width of a material 15 to be rolled in a hot rolling line. As shown in FIG. 1, the width reduction apparatus 2, the conveying apparatus 6, and the like. , An input unit 10, a storage unit 11, and a control unit 12.

  The width reduction device 2 includes a pair of press molds 3a and 3b, a mold drive motor 4a and a crank mechanism 5a for one press mold 3a, and a mold drive for the other press mold 3b. It has an electric motor 4b and a crank mechanism 5b.

  The press dies 3a and 3b are a pair of dies for reducing the width of the material to be rolled 15, and as shown in FIG. 1, in the width direction of the material to be rolled 15 (hereinafter abbreviated as the material width direction as appropriate). opposite. Specifically, the press dies 3a and 3b have press surfaces 3c and 3d that are pressed against the material to be rolled 15, respectively. Each press surface 3c, 3d is a flat surface suitable for the width reduction of the material 15 to be rolled. On the other hand, the entrance and exit sides of the press dies 3a and 3b are formed so as to have an appropriate inclination with respect to the press surfaces 3c and 3d. Such a pair of press dies 3 a and 3 b are arranged to face each other so that the press surfaces 3 c and 3 d face each other in the width direction of the material to be rolled 15.

  The mold driving motors 4a and 4b and the crank mechanisms 5a and 5b reciprocate the pair of press dies 3a and 3b in the material width direction. The mold drive motors 4a and 4b function as a drive source for the pair of press molds 3a and 3b. That is, the mold driving motors 4a and 4b generate a rotational driving force required for the reciprocating operation of the pair of press dies 3a and 3b. The crank mechanisms 5a and 5b reciprocate the pair of press dies 3a and 3b in the material width direction using the rotational driving force of the dies driving motors 4a and 4b. Specifically, the crank mechanism 5a converts the rotational driving force by the mold driving motor 4a into a reciprocating driving force in the material width direction, and uses the converted reciprocating driving force to press the mold 3a in the material width direction. Is reciprocated. The crank mechanism 5b converts the rotational driving force by the mold driving motor 4b into a reciprocating driving force in the material width direction, and uses the converted reciprocating driving force to reciprocate the press die 3b in the material width direction.

  The width reduction device 2 having the above-described configuration includes a pair of press dies so that the material to be rolled 15 is intermittently sandwiched from both sides in the width direction by the action of the mold driving motors 4a and 4b and the crank mechanisms 5a and 5b. The molds 3a and 3b are reciprocated in the material width direction. The width reduction device 2 thus presses the pair of press dies 3a and 3b against the material to be rolled 15 from the width direction of the material, whereby the material to be rolled 15 (for example, a steady portion having a substantially constant material width) is widened. Squeeze. Note that the width reduction amount of the material 15 to be rolled by the width reduction device 2 is controlled by the process computer 14 of the hot rolling line. The width reduction device 2 changes the starting point of each reciprocating operation of the pair of press dies 3a and 3b corresponding to the width reduction amount instructed by the process computer 14, and thereby the instructed width reduction amount. The width reduction is performed on the material 15 to be rolled.

  The conveyance device 6 conveys the material to be rolled 15 so as to pass between the pair of press dies 3a and 3b in the width reduction device 2. Specifically, as shown in FIG. 1, the transport device 6 includes an entrance side pinch roll 7 a, an exit side pinch roll 7 b, roll drive motors 8 a and 8 b, and motor drive units 9 a and 9 b.

  The entry-side pinch roll 7a has an entry side (specifically, a pair of press knives) in the conveyance path 13 of the material to be rolled 15 so that the rotation axis thereof and the conveyance direction of the material to be rolled 15 are perpendicular to each other. It is arranged on the entry side of the molds 3a and 3b. The roll drive motor 8a generates a rotational drive force by rotating its drive shaft, and rotates the entry-side pinch roll 7a around the rotational shaft using this rotational drive force. The electric motor drive unit 9 a adjusts the rotational speed of the drive shaft of the roll drive electric motor 8 a based on the control of the control unit 12. The electric motor drive unit 9a adjusts the conveyance amount of the material to be rolled 15 by the rotation operation of the entry-side pinch roll 7a through adjustment of the rotation speed of the roll driving electric motor 8a.

  The exit side pinch roll 7b has an exit side (specifically, a pair of press dies 3a and 3b) in the transport path 13 so that the rotation axis and the transport direction of the material 15 to be rolled are perpendicular to each other. Placed on the exit side). The roll driving motor 8b generates a rotational driving force by rotating the driving shaft, and rotates the output side pinch roll 7b around the rotating shaft using the rotational driving force. The electric motor drive unit 9b adjusts the rotational speed of the drive shaft of the roll driving electric motor 8b based on the control of the control unit 12. The electric motor drive unit 9b adjusts the conveyance amount of the material to be rolled 15 by the rotation operation of the exit side pinch roll 7b through the adjustment of the rotation speed of the roll driving electric motor 8b.

  The transport device 6 having the above-described configuration rotates the input side pinch roll 7a and the output side pinch roll 7b by the action of the roll drive motors 8a and 8b and the motor drive units 9a and 9b. Thereby, the conveyance apparatus 6 conveys the to-be-rolled material 15 intermittently along the conveyance path | route 13 for every width reduction of the to-be-rolled material 15 by the width reduction apparatus 2. FIG. In this case, the conveying device 6 intermittently carries the material to be rolled 15 between the pair of press dies 3a and 3b by the rotation operation of the entry-side pinch roll 7a, and the pair of the transfer device 6 by the rotation operation of the exit-side pinch roll 7b. The material 15 to be rolled is intermittently carried out between the press dies 3a and 3b. The amount of conveyance of the material to be rolled 15 by the conveying device 6 under one width reduction is controlled by the control unit 12. In the following description, the width reduction for one time of the material 15 to be rolled by the width reduction device 2, that is, the width reduction for one reciprocating operation of the pair of press dies 3 a and 3 b is “every width reduction of the material 15 to be rolled. As appropriate.

  The conveyance path | route 13 of the to-be-rolled material 15 is a path | route which passes between a pair of press metal mold | dies 3a and 3b, as shown in FIG. The conveyance direction of the material 15 to be rolled along the conveyance path 13 is a direction from the entry side to the exit side of the width reduction device 2 (see the thick line arrow in FIG. 1), and the width direction of the material 15 to be rolled. It is perpendicular to (material width direction).

  The input unit 10 is realized by using an input device such as an input key and a mouse, and inputs various information to the control unit 12 in response to an input operation of the operator. For example, as input information by the input unit 10, instruction information for instructing the control unit 12 to start or stop the conveyance amount control of the material to be rolled 15, and the width reduction device 2 is allowed to reduce the width of the material 15 to be rolled. Examples include information indicating an upper limit torque (hereinafter referred to as allowable torque). The allowable torque of the width reduction device 2 is an upper limit torque allowed for the mold driving motors 4a and 4b when the pair of press dies 3a and 3b are pressed against the material 15 to be rolled.

  The storage unit 11 stores the information instructed to be stored by the control unit 12 and transmits the storage information instructed to be read to the control unit 12. For example, the storage unit 11 stores a correlation data table 11 a for deriving the maximum conveyance amount according to the width reduction amount of the material to be rolled 15 as information used for the conveyance amount control of the material to be rolled 15. The correlation data table 11a avoids an inadvertent contact between the rolling material 15 and the pair of press dies 3a and 3b and the rolling material 15 under the width reduction of the material 15 to be rolled. The correlation with the maximum conveyance amount of the material 15 to be rolled is shown. Further, the maximum transport amount of the material to be rolled 15 shown in the correlation data table 11a satisfies the allowable torque of the width reduction device 2 (specifically, each allowable torque of the mold driving motors 4a and 4b) or less. is there. The storage unit 11 appropriately transmits such a correlation data table 11a to the control unit 12.

  The control part 12 is implement | achieved using the memory etc. which memorize | store the program for implement | achieving the conveyance amount control function of the to-be-rolled material 15 in the width reduction equipment 1, and CPU etc. which run the program in this memory. The control unit 12 controls the operations of the motor drive units 9a and 9b and the storage unit 11 of the transport device 6, and controls the input / output of electric signals to / from these components. In particular, the control unit 12 sets the maximum conveyance amount of the material to be rolled 15 that satisfies the allowable torque of the width reduction device 2 in accordance with the width reduction amount of the material to be rolled 15 acquired from the process computer 14, and is controlled by the conveyance device 6. The conveyance amount for each width reduction of the material 15 to be rolled is controlled to the set maximum conveyance amount.

  Specifically, based on the correlation data table 11a read out from the storage unit 11, the control unit 12 can avoid the inadvertent contact between the pair of press dies 3a and 3b and the material 15 to be rolled. Is derived according to the width reduction amount of the material 15 to be rolled. Here, the target maximum transport amount is a target maximum transport amount for each width reduction of the material 15 to be rolled. The controller 12 estimates the torque required for the width reduction device 2 when the material 15 to be rolled is reduced in width by the target maximum conveyance amount. When the estimated torque (hereinafter abbreviated as estimated torque as appropriate) is equal to or less than the allowable torque of the width reduction device 2, the control unit 12 satisfies the target maximum conveyance amount described above to satisfy the allowable torque of the width reduction device 2. The maximum conveyance amount of the material 15 is set. On the other hand, when the estimated torque exceeds the allowable torque of the width reduction device 2, the control unit 12 reduces the target maximum conveyance amount until the estimated torque becomes equal to or less than the allowable torque of the width reduction device 2. The control unit 12 sets the reduced target maximum conveyance amount as the maximum conveyance amount of the material to be rolled 15 that satisfies the allowable torque of the width reduction device 2. The control unit 12 controls the electric motor drive units 9a and 9b based on the maximum conveyance amount of the material to be rolled 15 set as described above, and the material to be rolled by the conveyance device 6 through the control of the electric motor drive units 9a and 9b. The conveyance amount for each width reduction of the material 15 is controlled to the above-described maximum conveyance amount.

  Although not particularly shown in FIG. 1, the width reduction equipment 1 according to the present embodiment is installed at a position where the width reduction of the material to be rolled 15 in the hot rolling line is required, such as the front stage of the rough rolling apparatus. . On the other hand, the process computer 14 sets the manufacturing conditions of the rolled product manufactured by the hot rolling line. Specifically, the process computer 14 receives the order information of the rolled product, and sets the production conditions (width reduction condition, etc.) for each material to be rolled based on the received order information. Such a process computer 14 provides the controller 12 with the width reduction condition of the material to be rolled 15 each time the material 15 to be rolled is carried into the width reduction equipment 1. In addition, as the width reduction conditions of the material to be rolled 15 provided to the control unit 12, for example, the thickness of the material to be rolled 15 (hereinafter abbreviated as material thickness as appropriate), the type of metal such as a steel type, the width reduction amount, and the like can be given. It is done.

  Next, a correlation between the width reduction amount and the maximum conveyance amount of the material to be rolled 15 shown by the correlation data table 11a (see FIG. 1) in the present embodiment will be described. FIG. 2 is a diagram showing an example of the correlation between the width reduction amount of the material to be rolled and the maximum conveyance amount of the material to be rolled that satisfies the allowable torque or less during width reduction. FIG. 3 is a diagram for explaining the width reduction amount and the conveyance amount of the material to be rolled in the present embodiment.

The correlation data table 11a shows the correlation between the width reduction amount ΔW [mm] of the material to be rolled 15 and the conveyance amount d [mm] of the material to be rolled 15 as exemplified by the correlation line L in FIG. That is, the correlation data table 11a, when the width reduction amount [Delta] W is a value less than [Delta] W _1, the transport amount d of the material to be rolled 15 is d _2, when the width reduction amount [Delta] W is [Delta] W ₂ or more values, The conveyance amount d of the material to be rolled 15 is d ₁ (<d ₂ ). In addition, when the width reduction amount ΔW is a value within the range of ΔW ₁ or more and less than ΔW ₂ , the transport amount d of the material to be rolled 15 is d ₁ or more and d ₂ or less as the width reduction amount ΔW increases or decreases. Increase or decrease within the transport amount range.

  Here, the width reduction amount ΔW of the material to be rolled 15 is the amount of reduction on both sides in the width direction of the material to be rolled 15 by the width reduction device 2 shown in FIG. That is, as shown in FIG. 3, the width reduction amount ΔW includes the width reduction amount ΔW / 2 of the material 15 to be rolled by one press die 3a and the width reduction amount ΔW of the material 15 to be rolled by the other press die 3b. / 2 is the total. Further, the conveyance amount d of the material to be rolled 15 is the length in the conveyance direction of the material to be rolled 15 carried between the pair of press dies 3a and 3b for each width reduction of the material to be rolled 15 by the width reduction device 2 (hereinafter referred to as the conveyance direction length d). , Called material length). That is, as shown in FIG. 3, the transport amount d is the length of the width-reduced portions 15 a and 15 b of the material to be rolled 15 that is width-reduced by one reciprocating operation of the pair of press dies 3 a and 3 b in the material width direction. is there. In such a width reduction (width reduction amount ΔW) of the material to be rolled 15 (width reduction amount ΔW), careless contact between the pair of press dies 3a and 3b and the material to be rolled 15 causes the press dies 3a, 3b, This means contact between the die portions other than the press surfaces 3c and 3d of 3b and the end portions 15c and 15d after the width reduction of the material 15 to be rolled.

  The conveyance amount d corresponding to the width reduction amount ΔW indicated by the correlation line L in FIG. 2 is the above-described pair of press dies 3a, when the width reduction amount ΔW is performed on the material 15 to be rolled. This is the maximum transport amount dmax of the material to be rolled 15 that can avoid inadvertent contact between 3b and the material 15 to be rolled. The correlation data table 11a shows the correlation between the maximum transport amount dmax of the material to be rolled 15 and the width reduction amount ΔW.

The correlation data table 11a as described above can be created on the basis of actual data of width reduction for a plurality of rolled materials having different width reduction conditions. For example, a plurality of materials to be rolled with different width reduction conditions are subjected to width reduction by the width reduction equipment 1, and correlation data between the width reduction amount ΔW and the conveyance amount d of various rolled materials are obtained for each of the plurality of width reductions. . Among the plurality of obtained correlation data, data satisfying a predetermined condition is converted into a data table as correlation data between the width reduction amount ΔW of the material to be rolled 15 and the maximum transport amount dmax. Thereby, the correlation data table 11a is created. Here, as the predetermined condition described above, for example, a condition that there is a correlation between the width reduction amount ΔW that satisfies the allowable torque of the width reduction device 2 and the maximum value of the conveyance amount d, and a pair of press dies 3a and 3b. And a condition that there is a correlation between the width reduction amount ΔW that does not cause inadvertent contact between the various rolled materials and the maximum value of the conveyance amount d, and the length of the width reduced portion of the various rolled materials is a pair of press gold The condition that it is below the length of each press surface 3c, 3d of mold 3a, 3b (length in the direction parallel to the conveyance direction of the to-be-rolled material 15) is mentioned. In particular, out of the transport amounts d ₁ and d ₂ shown in FIG. 2, the transport amount d ₁ is always inadvertent between the pair of press dies 3a and 3b and various rolled materials regardless of the increase in the width reduction amount ΔW. This is the maximum transport amount dmax that can avoid a serious contact. The conveyance amount d ₂ is always the maximum conveyance amount dmax at which the material length of the width reduction portion is equal to or less than the length of the press surfaces 3c, 3d of the pair of press dies 3a, 3b regardless of the decrease in the width reduction amount ΔW. is there.

  Next, the width reduction method according to the embodiment of the present invention will be described. FIG. 4 is a flowchart showing an example of the width reduction method according to the embodiment of the present invention. FIG. 5 is a diagram for explaining the increase / decrease in the transport amount of the material to be rolled accompanying the increase / decrease in the width reduction amount of the material to be rolled. In the width reduction method according to the present embodiment, the material to be rolled 15 is conveyed so as to pass between a pair of press dies 3a and 3b facing each other in the material width direction using the width reduction equipment 1 shown in FIG. On the other hand, the pair of press dies 3a and 3b are pressed against the material 15 to be rolled from the width direction of the material to reduce the width of the material 15 to be rolled. At that time, the width reduction equipment 1 receives the maximum conveyance amount dmax of the material 15 to be rolled that satisfies the allowable torque or less allowable for the mold driving motors 4a and 4b that are driving sources of the pair of press dies 3a and 3b. It is set according to the width reduction amount ΔW of the rolled material 15, and the conveyance amount d for each width reduction of the material to be rolled 15 is controlled to the maximum conveyance amount dmax.

  In detail, as shown in FIG. 4, the width reduction equipment 1 first acquires the width reduction condition of the material 15 to be rolled (step S101). In step S <b> 101, the control unit 12 acquires the material thickness h, the metal type, and the width reduction amount ΔW of the material to be rolled 15 from the process computer 14 as the width reduction conditions of the material to be rolled 15.

  Next, the width reduction facility 1 derives a target maximum conveyance amount dmt for each width reduction of the material to be rolled 15 according to the width reduction amount ΔW of the material to be rolled 15 (step S102). In step S <b> 102, the control unit 12 reads the correlation data table 11 a from the storage unit 11. Here, as described above, the correlation data table 11a includes the width reduction amount ΔW of the material to be rolled 15 and the pair of press dies 3a and 3b and the material to be rolled under the width reduction of the material 15 to be rolled having the width reduction amount ΔW. The correlation with the maximum conveyance amount dmax of the to-be-rolled material 15 which can avoid careless contact with the material 15 is shown. Based on the correlation data table 11a, the control unit 12 derives the target maximum conveyance amount dmt corresponding to the width reduction amount ΔW acquired in step S101. The target maximum transport amount dmt derived in this way can avoid inadvertent contact between the pair of press dies 3a and 3b and the material to be rolled 15 described above.

  Subsequently, the width reduction facility 1 is required for the drive source of the pair of press dies 3a and 3b, that is, the die drive motors 4a and 4b, when the material 15 to be rolled is reduced by the target maximum conveyance amount dmt. Torque is estimated (step S103). In step S103, the control unit 12 has the target maximum conveyance amount dmt of the material to be rolled 15 derived as described above, and the material thickness h and the width reduction amount ΔW of the material to be rolled 15 obtained in advance from the process computer. And the volume V of the whole width reduction part for the target maximum conveyance amount dmt of the material 15 to be rolled is calculated. The volume V is calculated by multiplying the target maximum transport amount dmt of the material to be rolled 15 by the material thickness h and the width reduction amount ΔW. Next, the control unit 12 performs the width reduction required when the entire width reduction portion corresponding to the target maximum conveyance amount dmt of the material to be rolled 15 is width-down based on the volume V and the metal type of the material to be rolled 15. The estimated torque of the mold drive motors 4a and 4b of the apparatus 2 is calculated.

  Thereafter, the width reduction facility 1 determines whether or not the estimated torque in Step S103 is equal to or less than the allowable torque under the width reduction for the target maximum transport amount dmt of the material to be rolled 15 (Step S104). In step S104, the control unit 12 performs a comparison process that compares the estimated torque calculated as described above with the allowable torque of the width reduction device 2 (specifically, the mold driving motors 4a and 4b). The allowable torque of the width reduction device 2 is input in advance to the control unit 12 by the input unit 10. The control unit 12 determines whether or not the estimated torque described above is equal to or less than the allowable torque of the width reduction device 2 by this comparison process.

  When the estimated torque described above is not equal to or less than the allowable torque of the width reduction device 2 (step S104, No), the control unit 12 sets the target maximum transport amount dmt of the material to be rolled 15 by a predetermined amount, Reduce (step S105). Thereafter, the control unit 12 returns to step S103 described above, and repeatedly executes the processes of steps S103 to S105 until the estimated torque becomes equal to or less than the allowable torque of the width reduction device 2. That is, when the estimated torque exceeds the allowable torque of the width reduction device 2, the width reduction facility 1 reduces the target maximum conveyance amount dmt of the material to be rolled 15 until the estimated torque becomes equal to or less than the allowable torque of the width reduction device 2. .

  On the other hand, when the estimated torque described above is equal to or less than the allowable torque of the width reduction device 2 (step S104, Yes), the width reduction equipment 1 uses the conveyance amount d for each width reduction of the material 15 to be reduced. The target maximum conveyance amount dmt that satisfies the allowable torque or less is controlled (step S106). In step S <b> 106, the control unit 12 sets the target maximum conveyance amount dmt that satisfies the allowable torque or less of the width reduction device 2 as the maximum conveyance amount dmax of the material to be rolled 15. Here, the target maximum conveyance amount dmt that satisfies this allowable torque or less is the target maximum conveyance amount dmt in step S102 when the estimated torque is equal to or less than the allowable torque of the width reduction device 2 without executing step S105. On the other hand, when the estimated torque becomes equal to or less than the allowable torque of the width reduction device 2 for the first time by executing step S105, the target maximum conveyance amount dmt that satisfies this allowable torque or less is the target maximum conveyance amount dmt after reduction in step S105. . Next, the control unit 12 sends a speed command signal for instructing the rotational speed of the drive shaft of each roll drive motor 8a, 8b in accordance with the set target maximum transport amount dmt described above to each motor drive unit of the transport device 6. It transmits to 9a, 9b. Thereby, the control unit 12 causes each of the motor drive units 9a and 9b to cause each of the roll drive motors 8a and 8b to perform a drive shaft rotation operation at a rotation speed corresponding to the set target maximum transport amount dmt. Control. Based on the speed command signal from the control unit 12, each motor drive unit 9a, 9b causes the respective drive motors 8a, 8b to rotate the drive shaft at a rotational speed corresponding to the set target maximum transport amount dmt. Control to rotate. The control unit 12 controls the widths of the material 15 to be rolled by the rotation operations of the entrance side pinch roll 7a and the exit side pinch roll 7b through the control of each of the motor drive units 9a and 9b and the roll drive motors 8a and 8b. The intermittent transport amount d for each reduction is controlled to the target maximum transport amount dmt after this setting.

  Thereafter, the width reduction equipment 1 performs the width reduction by the width reduction amount ΔW over the entire length of the material to be rolled 15 (step S107), and ends the width reduction process for one piece of the material 15 to be rolled. In step S107, the width reduction device 2 drives the die driving motors 4a, 4b and the like to perform the width reduction of the width reduction amount ΔW on the material 15 to be rolled, and the material 15 to be rolled from the material width direction. The pair of press dies 3a and 3b are intermittently pressed. The transport device 6 rotates the entry-side pinch roll 7a and the exit-side pinch roll 7b for each width reduction of the material 15 to be rolled by the width reduction device 2, and the target maximum conveyance amount dmt after the setting described above, The material 15 to be rolled is conveyed intermittently. The width reduction equipment 1 repeats each operation of the width reduction device 2 and the conveying device 6 over the entire length of the material 15 to be rolled, and as a result, in the material length direction (= conveying direction) of the material 15 to be rolled. Finish width reduction across the entire area.

  In addition, the width reduction equipment 1 repeats each process of step S101-S107 shown in FIG. 4 suitably for every to-be-rolled material in a hot rolling line. Thereby, the width reduction equipment 1 is the target maximum conveyance amount dmt according to the width reduction conditions similarly to the width reduction of the one to-be-rolled material 15 mentioned above with respect to all the rolled materials in a hot rolling line. The width can be reduced by (= maximum transport amount dmax).

  Here, the conveyance amount d for each width reduction of the material to be rolled 15 is controlled to the maximum conveyance amount dmax corresponding to the width reduction amount ΔW of the material to be rolled 15 as described above. In such a conveyance amount control, the maximum conveyance amount dmax for each width reduction of the material 15 to be rolled is appropriately increased or decreased as the width reduction amount ΔW is increased or decreased.

  For example, as shown in FIG. 5, when the width reduction amount ΔW of the material 15 to be rolled increases, the maximum conveyance amount dmax for each width reduction of the material 15 to be rolled decreases compared to before the width reduction amount increases. In this case, the area S of the contact portions 16a and 16b between the press surfaces 3c and 3d of the pair of press dies 3a and 3b and the width reduction portions 15a and 15b of the material to be rolled 15 is larger than that before the width reduction amount is increased. Decrease. Accordingly, the overall volume V of the width reduction portions 15a and 15b becomes the same as that before the width reduction amount increase (see the hatched portion in FIG. 5). The necessary torque of the width reduction device 2 required for width reduction of the material to be rolled 15 corresponding to the volume V is maintained below the allowable torque of the width reduction device 2 regardless of the increase in the width reduction amount ΔW.

  On the other hand, when the width reduction amount ΔW of the material 15 to be rolled decreases, the maximum conveyance amount dmax for each width reduction of the material 15 to be rolled increases compared to before the width reduction amount decreases. In this case, the area S of the contact portions 16a and 16b between the press surfaces 3c and 3d of the pair of press dies 3a and 3b and the width reduction portions 15a and 15b of the material to be rolled 15 is larger than that before the width reduction amount is reduced. Increase. Accordingly, the overall volume V of the width reduction portions 15a and 15b becomes the same as that before the width reduction amount is reduced. The required torque of the width reduction device 2 required when the material to be rolled 15 corresponding to the volume V is reduced in width satisfies the allowable torque of the width reduction device 2 or less regardless of the decrease in the width reduction amount ΔW. Approximate to torque (preferably equal). That is, even if the width reduction amount ΔW is reduced, the width reduction device 2 uses the torque of the die driving motors 4a and 4b to the maximum extent to reduce the width of the material 15 to be rolled. In this case, the conveyance device 6 can increase the maximum conveyance amount dmax for each width reduction of the material to be rolled 15 as much as possible without giving an excessive load to the width reduction device 2.

  As described above, in the embodiment of the present invention, the maximum conveyance amount of the material to be rolled that satisfies the allowable torque of the width reduction device or less is set according to the width reduction amount of the material to be rolled, and the width of the material to be rolled is determined. The conveyance amount for each reduction is controlled to the set maximum conveyance amount, and the material to be rolled for the maximum conveyance amount is sequentially width-wise while the material to be rolled is conveyed for each width reduction by the maximum conveyance amount. I'm down. For this reason, as the width reduction amount of the material to be rolled is reduced, the upper limit of the torque required for the width reduction of the material to be rolled is set to the allowable torque of the width reduction device, and the press die of the width reduction device and the width reduction portion of the material to be rolled. Thus, the volume of the entire width reduction portion of the material to be rolled can be approximated or equivalent to the maximum volume that can be reduced by using the allowable torque of the width reduction device. This makes it possible to reduce the width of the material to be rolled by making full use of the torque of the width reduction device at all times, enabling the maximum transport amount for each width reduction of the material to be rolled without applying an excessive load on the width reduction device. It can be increased as much as possible. As a result, it is possible to reduce the number of width reductions required to complete the width reduction of the material to be rolled over the entire length, thereby reducing the time required for width reduction of the whole material to be rolled. Since it can do, each rolling material in a hot rolling line can be width-reduced efficiently, and also the efficiency of the whole hot rolling process of hot-rolling a to-be-rolled material can be improved.

  Further, in the embodiment of the present invention, a target maximum conveyance amount for each width reduction of the material to be rolled is derived according to the width reduction amount of the material to be rolled, and the width reduction of the material to be rolled corresponding to the target maximum conveyance amount is achieved. When the required torque is equal to or less than the allowable torque of the width reduction device, this target maximum conveyance amount is set as the maximum conveyance amount of the material to be rolled, and the conveyance amount for each width reduction of the material to be rolled is set as the target maximum conveyance amount after setting. I have control. For this reason, the torque required for the width reduction of the material to be rolled corresponding to the above-mentioned maximum conveyance amount can be reliably maintained below the allowable torque of the width reduction device, and can be desirably made equal to the allowable torque. As a result, since the torque of the width reduction device can be utilized to a maximum extent with more certainty, the reduction of the time required for the width reduction of the entire rolled material is promoted, and the width reduction of each rolled material in the hot rolling line is promoted. The efficiency can be improved, and the efficiency of the entire hot rolling process can be further improved.

  Furthermore, in the embodiment of the present invention, when the torque required for the width reduction of the material to be rolled corresponding to the target maximum conveyance amount exceeds the allowable torque of the width reduction device, the target maximum conveyance amount until this torque becomes equal to or less than the allowable torque. Is reduced. For this reason, the torque required for the width reduction of the material to be rolled corresponding to the maximum conveyance amount can be reliably maintained below the allowable torque regardless of the change in the maximum conveyance amount of the material to be rolled accompanying the increase or decrease of the width reduction amount. As a result, it is possible to reduce the width of the material to be rolled for the maximum conveyance amount while reliably preventing an unreasonable load on the width reduction device.

  Further, in the embodiment of the present invention, the correlation between the width reduction amount of the material to be rolled and the maximum conveyance amount of the material to be rolled that can avoid inadvertent contact between the press die of the width reduction device and the material to be rolled. The target maximum conveyance amount that can avoid this inadvertent contact is derived based on the correlation data table indicating the above. By setting the target maximum conveyance amount as the maximum conveyance amount of the material to be rolled and controlling the conveyance amount for each width reduction of the material to be rolled to the target maximum conveyance amount after setting, the width reduction of the material to be rolled Regardless of the amount and the maximum conveyance amount, it is possible to stably reduce the width of the material to be rolled while avoiding inadvertent contact between the press die and the material to be rolled.

  Furthermore, the width reduction facility 1 according to the present embodiment is configured to learn an error between the estimated torque of the width reduction device 2 and the actual torque, thereby improving the accuracy of torque estimation in the subsequent width reduction. it can. In this case, for example, the actual values of the rotational drive speed and current of the mold driving motors 4a and 4b required when the width of the material 15 to be rolled is reduced are returned to the control unit 12 from the mold driving motors 4a and 4b. The control unit 12 calculates, for each material to be rolled, an error between the estimated torque calculated based on the width reduction condition and the like and the actual torque of the die driving motors 4a and 4b. Compare errors. The control unit 12 feeds back the result of the comparison process to torque estimation under the width reduction of the material to be rolled after the next time as a torque error learning result. Thereby, the control part 12 can perform a torque estimation with high precision in the width reduction of the to-be-rolled material after the next time.

  In the above-described embodiment, the target maximum conveyance amount of the material to be rolled according to the width reduction amount is set using a correlation data table indicating a correlation between the preset width reduction amount of the material to be rolled and the maximum conveyance amount. However, the present invention is not limited to this. That is, the target maximum conveyance amount of the material to be rolled may be derived without using such a correlation data table. For example, the control unit 12 calculates the time required for the width reduction device 2 to reciprocate the pair of press dies 3a and 3b by the width reduction amount based on the width reduction amount in the width reduction conditions. And you may calculate the target maximum conveyance amount of the to-be-rolled material 15 which the conveying apparatus 6 can perform within this calculated time.

  In the above-described embodiment, the target maximum conveyance amount of the material to be rolled is reduced until the estimated torque under the width reduction of the material to be rolled corresponding to the target maximum conveyance amount becomes equal to or less than the allowable torque of the width reduction device 2. However, the present invention is not limited thereto, and when the estimated torque is excessively lower than the allowable torque of the width reduction device 2, the target maximum conveyance amount may be increased. In this case, the control unit 12 compares the preset threshold value with the absolute value of the difference between the estimated torque and the allowable torque of the width reduction device 2, and if the torque difference is equal to or less than the threshold value, the estimated torque is The target maximum conveyance amount of the material to be rolled may be increased so as to increase the estimated torque with the allowable torque as an upper limit by determining that the allowable torque is excessively low.

  Furthermore, the present invention is not limited by the above-described embodiment, and the present invention includes a configuration in which the above-described constituent elements are appropriately combined. For example, the material 15 to be rolled may be a steel material such as a steel slab, or may be a metal material other than a steel material such as copper or aluminum. In addition, all other embodiments, examples, operation techniques, and the like made by those skilled in the art based on the above-described embodiments are included in the present invention.

DESCRIPTION OF SYMBOLS 1 Width reduction equipment 2 Width reduction apparatus 3a, 3b Press die 3c, 3d Press surface 4a, 4b Electric motor for drive of die 5a, 5b Crank mechanism 6 Conveying device 7a Input side pinch roll 7b Outlet side pinch roll 8a, 8b Motors 9a, 9b Motor drive unit 10 Input unit 11 Storage unit 11a Correlation data table 12 Control unit 13 Transport route 14 Process computer 15 Rolled material 15a, 15b Width reduction portion 15c, 15d End portions 16a, 16b Contact portion L Correlation line

Claims (6)

A width having a pair of press dies opposed to the width direction of the material to be rolled, and pressing the pair of press dies against the material to be rolled from the width direction of the material to be rolled to reduce the width of the material to be rolled. A reduction device;
A conveying device for conveying the material to be rolled so as to pass between the pair of press dies;
Of the transport amount of the material to be rolled that satisfies the allowable torque or less allowed by the width reduction device when the material to be rolled is width reduced, the mold parts other than the press surfaces of the pair of press dies and the Correlation between the maximum conveyance amount that is the maximum value of the conveyance amount of the material to be rolled and the width reduction amount of the material to be rolled, which can avoid inadvertent contact with the end portion after width reduction of the material to be rolled A storage unit for storing a correlation data table indicating
Based on the correlation data table, a target maximum conveyance amount, which is the target maximum conveyance amount for each width reduction of the material to be rolled, is derived according to the width reduction amount of the material to be rolled, and A control unit that controls the conveyance amount for each width reduction of the rolled material to the target maximum conveyance amount;
Width reduction equipment characterized by comprising. Wherein the control unit, the target maximum conveying amount of the calculated estimated torque required in the width reduction device when the width reduction of the rolled material, when the estimated torque is equal to or less than the allowable torque, the material to be rolled The width reduction equipment according to claim 1, wherein a conveyance amount for each width reduction is controlled to the target maximum conveyance amount. Wherein, if the estimated torque exceeds the permissible torque, the estimated torque is reduced the target maximum transport weight until below the allowable torque, reducing the conveyance amount for each width reduction of the material to be rolled The width reduction equipment according to claim 2, wherein the control is performed to the subsequent target maximum conveyance amount. The pair of press dies is pressed onto the material to be rolled from the width direction of the material to be rolled while conveying the material to be rolled so as to pass between a pair of press dies facing in the width direction of the material to be rolled. In the width reduction method for width reduction of the material to be rolled,
Of the transport amount of the material to be rolled that satisfies the allowable torque or less allowed by the drive source of the pair of press dies when the material to be rolled is reduced in width, other than the press surfaces of the pair of press dies The maximum conveyance amount that is the maximum value of the conveyance amount of the material to be rolled and the width of the material to be rolled, which can avoid inadvertent contact between the mold part and the end of the material to be rolled after the width reduction. Conveyance for deriving a target maximum conveyance amount, which is the maximum conveyance amount as a target for each width reduction of the material to be rolled, in accordance with the width reduction amount of the material to be rolled, based on a correlation data table indicating a correlation with the amount of reduction. A quantity derivation step;
And transport amount control step of controlling the conveyance amount for each width reduction of the material to be rolled to the target maximum conveying volume,
A width reduction method comprising: An estimated torque calculation step of calculating the estimated torque required for driving source of the pair of press dies when the width reduction of the material to be rolled of the target maximum conveying amount,
A determination step of determining whether the estimated torque is equal to or less than the allowable torque;
Wherein the said transport quantity control step, when the estimated torque is equal to or less than the allowable torque, claim 4, characterized in that to control the conveyance amount for each width reduction of the material to be rolled to the target maximum transport weight The width reduction method described in 1. When the estimated torque exceeds the allowable torque, the method further includes a conveyance amount reduction step of reducing the target maximum conveyance amount until the estimated torque becomes equal to or less than the allowable torque,
The conveyance amount control step, the width reduction method according to claim 5, wherein the controller controls the target maximum conveying amount after reducing the conveyance amount for each width reduction of the material to be rolled.

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