JP7338732B1 - Roll information calculation device, roll information calculation method, rolling equipment adjustment method, and round bar product manufacturing method - Google Patents

Abstract

[Problem] A roll information calculation device and roll information capable of calculating roll information including the opening degree of each roll and the thrust amount of each roll in a final rolling mill and a pre-rolling mill, and making the shape of a round bar product close to a perfect circle. A calculation method, a method for adjusting rolling equipment, and a method for manufacturing round bar products are provided. A roll information calculation device 10 includes a roll thrust amount calculation section 14 and a roll opening degree calculation section 15. The roll thrust amount calculation unit 14 calculates the material path core PC (Xs, Ys) of the hole mold 5 and the caliber bottom coordinates 4ap (xa, ya) to 4cp (xc, yc); 4dp (xd, yd) to 4fp (xf , yf), the thrust amounts Sa to Sc; Sd to Sf of each roll 4a to 4c; 4d to 4f in each of the final rolling mill 3n and the first rolling mill 3n-1 are calculated. The roll opening degree calculation unit 15 calculates the opening degrees Ra to Rc; Rd to Rf of each of the rolls 4a to 4c; 4d to 4f. [Selection diagram] Figure 4

Description

The present invention provides a roll information calculation apparatus and roll information calculation for calculating roll information including the opening degree of each roll and the thrust amount of each roll in a final rolling mill and a front rolling mill in order to approximate the shape of a round bar product to a perfect circle. The present invention relates to a method, a method of adjusting rolling equipment, and a method of manufacturing a round bar product.

In a steel bar rolling line in a steelworks, a rolling facility equipped with a two-roll mill in which a pair of rolls face each other and a three-roll mill in which three rolls are arranged at intervals of 120° in the circumferential direction rolls a steel material to be a round bar product, Manufactures round bar products. In particular, in the finishing mill, a three-roll mill is generally used, and the steel material is rolled down from three directions, so the shape of the round bar product tends to be triangular. Here, in a round bar product that requires high dimensional accuracy, not only eccentricity but also high roundness (high concentricity) is required.

2. Description of the Related Art As a conventional round bar dimension control device for improving the dimensional accuracy of a round bar product, for example, the one disclosed in Patent Document 1 is known.
The round bar dimension control device disclosed in Patent Document 1 measures the temperature of the strip at the entry side of the rolling mill in a strip rolling mill using a groove, and measures the widthwise dimension change ΔB in the rolling mill caused by this temperature change ΔT. and the vertical dimension change ΔH are predicted, and the necessary reduction amount is determined so that the width dimension variation and the vertical dimension variation become equal.

Further, as a conventional method for controlling the dimensions of wire rods for improving the dimensional accuracy of rods and wires, for example, the method disclosed in Patent Document 2 is known.
The method for controlling the dimensions of a bar or wire rod disclosed in Patent Document 2 is a rolling mill (No. (i-1) rolling mill) located one upstream from the most downstream rolling mill (No. i rolling mill) in strip rolling using a caliber. The temperature of the strip on the entry side was measured, and the number resulting from this temperature change ΔT was calculated. i Predicted the width direction dimensional change ΔB and vertical dimensional change ΔH on the delivery side of the rolling mill, and determined the No. i rolling mill and No. (i-1) Reduction change of rolling mill and No. i Relationship with dimensional change in the width direction on the delivery side of the rolling mill; i rolling mill and No. (i-1) Reduction change of rolling mill and No. i Solving two simultaneous equations of the relation with the vertical dimension change on the delivery side of the rolling mill, No. for canceling out ΔB and ΔH. i rolling mill, no. (i-1) Finding the reduction correction amount of the rolling mill.

JP-A-58-218315 JP-A-60-199512

However, the round bar dimension control device disclosed in Patent Document 1 and the bar wire dimension control method disclosed in Patent Document 2 have the following problems.
That is, in the case of the round bar dimension control device shown in Patent Document 1, the temperature of the strip at the entrance side of the final rolling mill is measured, and the width direction dimension change ΔB at the exit side of the final rolling mill caused by this temperature change ΔT is calculated. This is to predict the vertical dimension change ΔH and determine the necessary roll reduction amount at the final rolling mill so that the width dimension variation and the vertical dimension variation become equal, taking into consideration the influence of the front rolling mill of the final rolling mill. There is a problem that it has not been done.

Further, in the case of the dimensional control method of the bar or wire shown in Patent Document 2, the relationship between the reduction change in the final rolling mill and the front rolling mill and the width direction dimensional change on the delivery side of the final rolling mill, and the relationship between the final rolling mill and the front rolling mill It is necessary to determine in advance the relationship between the reduction change and the vertical dimension change on the delivery side of the final rolling mill.

Accordingly, the present invention has been made to solve these conventional problems, and its object is to prevent the reduction change in the final rolling mill and the front rolling mill, the width direction dimensional change on the delivery side of the final rolling mill, and the vertical dimension in advance. It is possible to calculate the roll information including the opening degree of each roll and the thrust amount of each roll in the final rolling mill and the front rolling mill without determining the relationship with the change, and to make the shape of the round bar product closer to a perfect circle. It is an object of the present invention to provide a roll information calculation device, a roll information calculation method, a rolling equipment adjustment method, and a round bar product manufacturing method that can be used.

A roll information calculation device according to one aspect of the present invention performs rolling of steel materials to be round bar products by rolling equipment including a final rolling mill consisting of a 2-roll mill, a 3-roll mill, or a 4-roll mill and a front rolling mill for the final rolling mill. When performing, a roll information calculation device that calculates roll information including the opening degree of each roll and the thrust amount of each roll in the final rolling mill and the front rolling mill. and a caliber for calculating caliber bottom coordinates of each roll in each of the final rolling mill and the front rolling mill based on the profile information acquired by the profile information acquiring unit. Based on the bottom coordinate calculation unit and the caliber bottom coordinates of each roll calculated by the caliber bottom coordinate calculation unit, the caliber material pass core of each roll in each of the final rolling mill and the front rolling mill is calculated. Based on the material pass core calculation unit, the material pass core of the caliber by each roll calculated by the material pass core calculation unit, and the caliber bottom coordinates of each roll calculated by the caliber bottom coordinate calculation unit, the above A roll thrust amount calculation unit for calculating the thrust amount of each roll in each of the final rolling mill and the front rolling mill; a grooved material pass core calculated by each roll calculated by the material pass core calculation unit; and the caliber bottom a roll opening calculation unit that calculates the opening of each roll in each of the final rolling mill and the front rolling mill based on the caliber bottom coordinates of each roll calculated by the coordinate calculation unit. This is the gist.

Further, a roll information calculation method according to another aspect of the present invention includes a final rolling mill consisting of a two-roll mill, a three-roll mill, or a four-roll mill, and a rolling facility including a front rolling mill for the final rolling mill. A roll information calculation method for calculating roll information including the opening degree of each roll and the thrust amount of each roll in the final rolling mill and the front rolling mill when performing rolling, wherein the round bar product measured with a dimension measuring instrument Caliber bottom coordinates of each roll in each of the final rolling mill and the front rolling mill based on the profile information obtaining step of obtaining profile information for the cross section of and the profile information obtained in the profile information obtaining step Based on the caliber bottom coordinate calculation step and the caliber bottom coordinates of each roll calculated in the caliber bottom coordinate calculation step, the material pass core of the caliber by each roll in each of the final rolling mill and the front rolling mill based on the material pass core calculating step for calculating the material pass core calculating step, the material pass core of the caliber by each roll calculated in the material pass core calculating step, and the caliber bottom coordinates of each roll calculated in the caliber bottom coordinate calculating step a roll thrust amount calculation step for calculating the thrust amount of each roll in each of the final rolling mill and the front rolling mill; and a roll opening calculation step of calculating the opening of each roll in each of the final rolling mill and the front rolling mill based on the caliber bottom coordinates of each roll calculated in the caliber bottom coordinate calculation step. is the gist.

Further, a rolling equipment adjusting method according to another aspect of the present invention is summarized in adjusting the final rolling mill and the front rolling mill using the roll information calculated by the roll information calculating method described above.
In addition, a method for manufacturing a round bar product according to another aspect of the present invention includes rolling the round bar product by rolling equipment including a final rolling mill and a front rolling mill adjusted by the above-described method for adjusting rolling equipment. This is the gist.

According to the roll information calculation device, the roll information calculation method, the rolling equipment adjustment method, and the round bar product manufacturing method according to the present invention, the reduction change of the final rolling mill and the front rolling mill and the final rolling mill delivery side can be calculated in advance. Calculate the roll information including the opening degree of each roll and the thrust amount of each roll in the final rolling mill and the front rolling mill without determining the relationship between the width direction dimensional change and the top and bottom dimensional change, and the shape of the round bar product can be approximated to a perfect circle.

1 is a schematic configuration diagram of a steel bar rolling line provided with rolling equipment that is adjusted based on roll information calculated by a roll information calculation device according to an embodiment of the present invention; FIG. FIG. 2 is an explanatory view of rolls of a final rolling mill in the rolling facility shown in FIG. 1; FIG. 2 is an explanatory diagram of rolls of a front rolling mill in the rolling facility shown in FIG. 1 ; 1 is a functional block diagram showing a schematic configuration of a role information calculation device according to one embodiment of the present invention; FIG. 5 is a flow chart showing the flow of processing in the role information calculation device shown in FIG. 4; It is a figure for demonstrating the profile information with respect to the cross section of a round-bar product. It is a figure for demonstrating the caliber bottom coordinate of each roll in a final rolling mill. FIG. 4 is a diagram for explaining caliber bottom coordinates of each roll in the front rolling mill; It is a figure for demonstrating how to calculate the caliber bottom coordinate of the upper roll in a final rolling mill. It illustrates an example of how to calculate the caliber bottom coordinates of the upper roll in the final rolling mill, showing the start (first stage) to the second stage. An example of how to calculate the caliber bottom coordinates of the upper roll in the final rolling mill is shown, following FIG. 10, showing the third to fourth stages. This illustrates an example of how to calculate the caliber bottom coordinates of the upper roll in the final rolling mill, and shows the end (fifth stage) following FIG. A specific example of how to calculate the caliber bottom coordinates of the upper roll in the final rolling mill when the profile information for the cross section of the round bar product is shown in Table 1 will be described. In a specific example of how to calculate the x coordinate of the caliber bottom of the upper roll in the final rolling mill shown in Table 2, ΣAi−L/ΣAi=ΣAi−L/(ΣAi−L+ΣAi−R)=0.5 x It shows an example of calculating coordinates by averaging three points. FIG. 4 is a diagram for explaining the caliber material pass core of each roll in the final rolling mill, the thrust amount of each roll, and the opening of each roll. FIG. 4 is a diagram for explaining how to calculate a caliber material pass core by each roll in a final rolling mill. FIG. 3 is a diagram for explaining the caliber material pass core of each roll in the front rolling mill, the thrust amount of each roll, and the opening of each roll. The three angles of the round bar product when the final pass roll radius of the final rolling mill matches the target radius of the round bar product, and the final pre-pass roll radius of the front rolling mill is greater than the target radius of the round bar product It is a figure for demonstrating the adjustment method of the front rolling mill based on. The three angles of the round bar product when the final pass roll radius of the final rolling mill is smaller than the target radius of the round bar product, and the final pre-pass roll radius of the front rolling mill matches the target radius of the round bar product. It is a figure for demonstrating the adjustment method of the final rolling mill based on. The radius of the round bar product rolled with the caliber before adjusting by calculating the thrust amount of each roll and the opening degree of each roll in the final rolling mill and the front rolling mill by the roll information calculating device according to one embodiment of the present invention. and the radius of the caliber. The radius of the round bar product rolled with the caliber after calculating and adjusting the thrust amount of each roll and the opening degree of each roll in the final rolling mill and the front rolling mill by the roll information calculating device according to one embodiment of the present invention and the radius of the caliber.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments shown below exemplify apparatuses and methods for embodying the technical idea of the present invention. It is not intended to be specific to the following embodiments.
Also, the drawings are schematic. Therefore, it should be noted that the relationship, ratio, etc. between the thickness and the planar dimensions are different from the actual ones, and the drawings include portions where the relationship and ratio of the dimensions are different from each other.

FIG. 1 shows a schematic configuration of a steel bar rolling line provided with rolling equipment that is adjusted based on roll information calculated by a roll information calculation device according to an embodiment of the present invention.
A steel bar rolling line 1 shown in FIG. 1 includes a heating furnace 2 for heating a steel material SS made of a steel bar or a wire rod to be a round bar product S (see FIG. 6), and conveying the steel material SS heated in the heating furnace 2 in the longitudinal direction. A rolling facility 3 for rolling while rolling is provided.
The rolling equipment 3 has No. 1 rolling mill 3 ₁ to No. It has rolling mills with a total of n stands up to n rolling mills _3n . In this rolling equipment 3, the steel materials SS heated to a preset temperature in the heating furnace 2 are No. 1 rolling mill 3 ₁ to No. The steel is successively rolled in n rolling mills _3n , and the diameter is gradually reduced each time it passes through the rolling mills, and finally finished to the product diameter.

Here, No. 1 rolling mill 3 ₁ to No. Rolling mills up to k 3 _k are rough rolling mills and intermediate rolling mills, and consist of a two-roll mill in which a pair of rolls are opposed to each other. Also, No. k+1 rolling mill 3 _k+1 to No. Rolling Mill 3 Up to _n is a finishing mill, and is composed of a three-roll mill in which three rolls are installed at intervals of 120° in the circumferential direction.
As shown in FIG. 2, the final rolling mill (No. n rolling mill) 3 _n in the rolling facility 3 has a roll 4a arranged on the upper side and rolls 4c and 4b arranged on both left and right sides. , 4c is composed of a 3-roll mill with an equilateral triangle. Each roll 4a, 4b, 4c is formed with a caliber 5 corresponding to the rolling schedule.

In addition, the front rolling mill (No. n-1 rolling mill) 3 _{n -1} for the final rolling mill (No. n rolling mill) 3 n in the rolling equipment 3, as shown in FIG. The three-roll mill is arranged on both sides, the roll 4e is arranged on the lower side, and the figure formed by the rotation axes of the respective rolls 4d, 4e, and 4f is an equilateral triangle. Each roll 4d, 4e, 4f is formed with a caliber 5 corresponding to the rolling schedule.
When rolling the steel SS by applying a three-roll mill to the final rolling mill _3n and the front rolling mill 3n _-1 of such finish rolling, the steel SS is rolled by the three rolls 4a, 4b, 4c; 4d, 4e, and 4f. Since the rolling is performed from three directions, the shape of the round bar tends to be triangular. In the round bar product S, which requires high dimensional accuracy, high roundness is supplied, so the steel material SS is rolled by applying a 3-roll mill to the final rolling mill 3 _n and the front rolling mill 3 _n-1 of the finish rolling. Rolling that can achieve higher roundness is required in

_For this reason, in _the present embodiment, the roll information calculation device 10 shown in FIG. , Rb, Rc; Rd, Re, Rf and the thrust amounts Sa, Sb, Sc; Sd, Se, Sf of the respective rolls 4a, 4b, 4c; 4d, 4e, 4f; is calculated, and the calculated roll information is used to adjust the final rolling mill 3 _n and the front rolling mill 3 _n−1 of the rolling equipment 3 .

The roll _{information calculation device} 10 shown in FIG. Opening _degrees Ra, Rb, Rc; Rd, Re, Rf of rolls 4a, 4b, 4c; 4d, 4e, 4f; Thrust amounts of rolls 4a, 4b, 4c; Calculate roll information including Sa, Sb, Sc; Sd, Se, and Sf.
As shown in FIG. 4, the roll information calculation device 10 includes a profile information acquisition unit 11, a caliber bottom coordinate calculation unit 12, a material pass core calculation unit 13, a roll thrust amount calculation unit 14, a roll opening calculation unit 15, a product A triangular angle calculator 16 and an output unit 17 are provided. The roll information calculation device 10 is a computer system having an arithmetic processing function, and by executing various dedicated computer programs pre-stored in hardware, a profile information acquisition unit 11, a caliber bottom coordinate calculation unit 12, a material path Each function of the core calculation unit 13, the roll thrust amount calculation unit 14, the roll opening calculation unit 15, the product triangular angle calculation unit 16, and the output unit 17 (steps S1 to S7 described later) can be realized on software. It's becoming

The profile information acquisition unit 11 acquires profile information of the cross section of the round bar product S measured by a dimension measuring device (not shown), which is input to the input device (not shown) of the roll information calculation device 10. do. The profile information, as shown in FIG. It is information of the x-coordinate value, y-coordinate value, angle θ in the circumferential direction around the measurement core MC, and radius R of Pn. Table 1 shows the x-coordinate values and y-coordinate values of 20 measurement points P1 to P20 on the outer peripheral surface of a predetermined cross section of the round bar product S, the circumferential angle θ about the measurement core MC, and the radius R An example of information is illustrated. Regarding the angle θ in the circumferential direction, an angle of 0° to 180° in the positive x-axis direction centered on the measurement center MC is positive, and an angle of 0° to 180° in the negative x-axis direction centered on the measurement center MC is negative. there is The round bar product S is obtained after rolling the steel material SS in the rolling equipment 3 .

The dimension measuring instrument adopts a light section method. In the light-section method, a belt-shaped laser beam is irradiated onto the surface of the object and diffusely reflected, and the reflected light is received by six CCD cameras to form an image. It is possible to measure local irregularities by acquiring data.
Further, the caliber bottom coordinate calculator 12 calculates the _respective rolls 4a, _4b , 4c; Caliber base coordinates of 4e, 4f 4ap (xa, ya), 4bp (xb, yb), 4cp (xc, yc); 4dp (xd, yd), 4ep (xe, ye), 4fp (xf, yf) do.

The caliber bottom coordinates 4ap (xa, ya) are the coordinates of the center of the bottom forming the caliber 5 of the upper roll 4a of the final rolling mill _3n , as shown in FIG. The caliber bottom coordinates 4bp (xb, yb), as shown in FIG. 7, are similarly the coordinates of the center of the bottom forming the caliber 5 of the right roll 4b of the final rolling mill _3n . Further, the caliber bottom coordinates 4cp (xc, yc), as shown in FIG. 7, are similarly the coordinates of the center of the bottom forming the caliber 5 of the left roll 4c of the final rolling mill _3n .
On the other hand, the caliber bottom coordinates 4dp (xd, yd), as shown in FIG. 8, are the coordinates of the center of the bottom forming the caliber 5 of the right roll 4d of the front rolling mill 3n _-1 . The caliber bottom coordinates 4ep (xe, ye), as shown in FIG. 8, are similarly the coordinates of the center of the bottom forming the caliber 5 of the lower roll 4e of the front rolling mill 3n _-1 . Further, the caliber bottom coordinates 4fp (xf, yf), as shown in FIG. 8, are similarly the coordinates of the center of the bottom forming the caliber 5 of the left roll 4f of the front rolling mill 3n _-1 .

Specifically, the calculation of the caliber bottom coordinates 4ap (xa, ya) is based on the profile information of the upper roll 4a of the final rolling mill _3n acquired by the profile information acquiring unit 11, as shown in FIG. , the left cross-sectional area ΣAi-L formed by the bottom surface of the upper roll 4a on the left side (the side with the smaller x-coordinate value) with respect to the center line CL passing through a predetermined point on the x-coordinate and the right side with respect to the center line CL ( The right cross-sectional area ΣAi-R formed by the bottom surface of the upper roll 4a on the side where the x-coordinate value is larger) becomes equal, that is, ΣAi-L/ΣAi=ΣAi-L/(ΣAi-L+ΣAi-R)=0. The coordinates 4ap (xa, yp) of the predetermined point when 5 is used as the caliber bottom coordinates.

An example of calculation of the caliber bottom coordinates 4ap(xa, ya) will be described more specifically with reference to FIGS. 10 to 12. FIG.
FIG. 10 shows from the start (first stage) to the second stage in an example of how to calculate the caliber bottom coordinates 4ap (xa, ya) of the upper roll 4a in the final rolling mill _3n . FIG. 11 shows an example of how to calculate the caliber bottom coordinates 4ap (xa, ya) of the upper roll 4a in the final rolling mill _3n , following FIG. 10, from the third stage to the fourth stage. there is FIG. 12 shows the end (fifth stage) following FIG. 11 in an example of how to calculate the caliber bottom coordinates 4ap (xa, ya) of the upper roll 4a in the final rolling mill _3n .

10 to 12 illustrate measurement points P1 to P13 acquired by the profile information acquisition unit 11 corresponding to the caliber bottom of the upper roll 4a in the final rolling mill _3n . Section B1, section B2 between measurement points P2 and P3, . . . , section B10 between measurement points P10 and P11.
First, as shown in FIG. 10, at the start (first stage), a section B1 formed by the bottom surface BL of the upper roll 4a on the left side with respect to the center line CL passing through a predetermined point on the x coordinate in the section B4, A half of section B4, B5, B6 and a right side sectional area of section B7 formed by the bottom surface BL of the upper roll 4a on the right side with respect to the center line CL and the left side sectional area ΣAi-L of the half of section B2, B3 and section B4 A comparison with ΣAi-R reveals that the left cross-sectional area ΣAi-L<right cross-sectional area ΣAi-R. Note that the distance xk/2 from the measurement point P1 to a predetermined point on the x coordinate in the section B4 through which the center line CL passes is the distance xk from the predetermined point on the x coordinate to the measurement point P8 in the section B4 through which the center line CL passes. /2 are equal.

Next, as shown in FIG. 10, in the second step, the center line CL is shifted in the positive direction of the x-axis, and the upper roll 4a on the left side with respect to the center line CL passing through a predetermined point on the x-coordinate in section B5 Sections B2, B3, and B4 formed by the bottom surface BL of and half of the section B5 formed by the left side cross-sectional area ΣAi-L of half of the section B5 and the bottom surface BL of the upper roll 4a on the right side with respect to the center line CL, Comparing the right cross-sectional areas ΣAi-R of B6, B7 and section B8, the left cross-sectional area ΣAi-L<right cross-sectional area ΣAi-R. Note that the distance xk/2 from the measurement point P2 to a predetermined point on the x coordinate in the section B5 through which the center line CL passes is the distance xk from the predetermined point on the x coordinate in the section B5 through which the center line CL passes to the measurement point P9. /2 are equal.

Next, as shown in FIG. 11, in the third step, the center line CL is shifted in the positive direction of the x-axis, and the upper roll 4a on the left side with respect to the center line CL passing through a predetermined point on the x-coordinate in section B6 Sections B3, B4, and B5 formed by the bottom surface BL of and half of the section B6 formed by the bottom surface BL of the upper roll 4a on the right side with respect to the center line CL, A comparison of the right cross-sectional areas ΣAi-R of B7, B8 and section B9 reveals that the left cross-sectional area ΣAi-L<right cross-sectional area ΣAi-R. Note that the distance xk/2 from the measurement point P3 to a predetermined point on the x coordinate in the section B6 through which the center line CL passes is the distance xk from the predetermined point on the x coordinate in the section B6 through which the center line CL passes to the measurement point P10. /2 are equal.

Next, as shown in FIG. 11, in the fourth step, the center line CL is shifted in the positive direction of the x-axis, and the upper roll 4a on the left side with respect to the center line CL passing through a predetermined point on the x-coordinate in section B7 Sections B4, B5, and B6 formed by the bottom surface BL of and half of the section B7 formed by the left side cross-sectional area ΣAi-L of the half of the section B7 and the bottom surface BL of the upper roll 4a on the right side with respect to the center line CL, Comparing the right cross-sectional areas ΣAi-R of B8, B9 and section B10, the left cross-sectional area ΣAi-L>right cross-sectional area ΣAi-R, and the size of the cross-sectional areas is reversed. Note that the distance xk/2 from the measurement point P4 to a predetermined point on the x coordinate in the section B7 through which the center line CL passes is the distance xk/2 from the predetermined point on the x coordinate in the section B7 through which the center line CL passes to the measurement point P11. /2 are equal.

Then, in the fourth stage, the cross-sectional area is reversed to the left side cross-sectional area ΣAi-L>right side cross-sectional area ΣAi-R. Therefore, as shown in FIG. The left cross-sectional area ΣAi-L of the section formed by the bottom surface BL of the upper roll 4a on the left side with respect to the center line CL passing through a predetermined point on the x coordinate in the section B6 and the center line CL The x-coordinate xa of a predetermined point when the right cross-sectional area ΣAi−R of the section formed by the bottom surface BL of the upper roll 4a on the right side is equal to the y-coordinate ya of the predetermined point at this time, and the coordinate 4ap (xa , yp) be the caliber base coordinates.

13 shows how to calculate the caliber bottom coordinates 4ap (xa, yp) of the upper roll 4a in the final rolling mill _3n when the profile information for the cross section of the round bar product S is shown in Table 1. A specific example is shown.
Table 2 shows an example of how to calculate the x-coordinate xa of the caliber bottom of the upper roll 4a in the final rolling mill _3n when the profile information for the cross section of the round bar product S is shown in Table 1. It is

Further, FIG. 14 shows a specific example of how to calculate the x-coordinate of the caliber bottom of the upper roll in the final rolling mill shown in Table 2, where ΣAi−L/ΣAi=ΣAi−L/(ΣAi−L+ΣAi−R) An example of calculating the x-coordinate of 0.5 by averaging three points is shown.
In the example shown in FIG. 14, when calculating the x-coordinate xa such that ΣAi−L/ΣAi=ΣAi−L/(ΣAi−L+ΣAi−R)=0.5, ΣAi−L/ΣAi=0.5 is calculated. A three-point average x-coordinate of x-coordinates larger than ΣAi-L/ΣAi=0.50 and a three-point-average x-coordinate of x-coordinates smaller than ΣAi−L/ΣAi=0.50 are sandwiched between Let xa be the x-coordinate where the straight line intersects ΣAi−L/ΣAi=0.5.

In the examples shown in Tables 1, 2, 13, and 14, for the caliber bottom coordinates 4ap (xa, yp) of the upper roll 4a in the final rolling mill _3n , the x-coordinate xa of the caliber bottom is ΣAi-L /ΣAi=ΣAi−L/(ΣAi−L+ΣAi−R)=0.5, the x-coordinate xa of the caliber bottom is 0.2739 mm.
The caliber bottom coordinate calculator 12 also calculates the caliber bottom coordinates 4ap (xa, ya) for the caliber bottom coordinates 4bp (xb, yb) and 4cp (xc, yc) of the rolls 4b and 4c in the final rolling mill _3n . Calculated by the same method as

Further, the caliber bottom coordinate calculator 12 calculates the caliber bottom coordinates 4dp (xd, yd), 4ep (xe, ye), and 4fp (xf, yf) of the rolls 4d, 4e, and 4f in the front rolling mill 3n _-1. are also calculated by the same method as for the caliber bottom coordinates 4ap(xa, ya).
Further, the material pass core calculation unit 13 of the roll information calculation device 10 calculates the caliber bottom coordinates 4ap (xa, ya) and 4bp (xb, yb) of the rolls 4a, 4b, and 4c calculated by the caliber bottom coordinate calculation unit 12. , 4cp (xc, yc), the material pass core PC (Xs, Ys) (see FIG. 15) of the groove 5 by each roll 4a, 4b, 4c in the final rolling mill _3n is calculated.

Further, the material path core calculation unit 13 of the roll information calculation device 10 calculates the caliber bottom coordinates 4dp (xd, yd) and 4ep (xe, ye) of the rolls 4d, 4e, and 4f calculated by the caliber bottom coordinate calculation unit 12. , 4fp(xf, yf), the material pass core PC (Xs, Ys) (see FIG. 17) of the caliber 5 by each roll 4d, 4e, 4f in the front rolling mill 3n ₋₁ is calculated.
Calculation of the material pass core PC (Xs, Ys) of the caliber 5 by each roll 4a, 4b, 4c in the final rolling mill _3n will be described with reference to FIGS. 15 and 16. FIG.

The caliber center coordinates of the axis of the roll 4a in the final rolling mill _3n are 4ac (Xa, Ya), the caliber center coordinates of the axis of the roll 4b are 4bc (Xb, Yb), and the caliber center coordinates of the axis of the roll 4c are 4cc (Xc, Yc),
Xa=xa (1)
Ya=ya+Da/2 (2)
Xb=xb+Db/2×cos(30) (3)
Yb=yb−Db/2×sin(30) (4)
Xc=xc−Dc/2×cos(30) (5)
Yc=yc−Dc/2×sin(30) (6)
can be expressed as

Here, Da is the diameter of roll 4a at the caliber bottom, Db is the diameter of roll 4b at the caliber bottom, and Dc is the diameter of roll 4c at the caliber bottom. Each can be set to 0 in the calculation.
Therefore,
Xa=xa (7)
Ya=ya (8)
Xb=xb (9)
Yb=yb (10)
Xc=xc (11)
Yc=yc (12)
It can be expressed as.

Then, referring to FIG. 16, when calculating the material pass core PC (Xs, Ys) of the caliber 5,
Xs=Xc+Δx=Xc+(Yb−Yc)/2×tan(30)+(Xb−Xc)/2 (13)
Ys=Ya-H=Ya-{(Xb-Xc)×√3/2+Ya-(Yb-Yc)/2}/3 (14)
can be expressed as
Substitute xb, yb, xc, and yc calculated from formulas (9), (10), (11), and (12) into formula (13), and substitute formula (8) into formula (14). 9) substituting ya, xb, yb, xc, and yc calculated from formulas (10), (11), and (12),
Xs=xc+(yb−yc)/2×tan(30)+(xb−xc)/2 (15)
Ys=ya−{(xb−xc)×√3/2+ya−(yb−yc)/2}/3 (16)
It can be expressed as.

In the material pass core PC (Xs, Ys) of the caliber 5 by each roll 4d, 4e, 4f in the front rolling mill 3 _n−1 , Xs is the value calculated by the formula (15), and Ys is ( 16) Use the same value as calculated by the formula.
Further, the roll thrust amount calculation unit 14 of the roll information calculation device 10 calculates the material pass core PC (Xs, Ys) of the caliber 5 by each of the rolls 4a, 4b, and 4c calculated by the material pass core calculation unit 13, and the caliber The final rolling mill 3 _n , thrust amounts Sa, Sb, and Sc (see FIG. 15) of the respective rolls 4a, 4b, and 4c are calculated.

Further, the roll thrust amount calculation unit 14 of the roll information calculation device 10 calculates the material pass core PC (Xs, Ys) of the caliber 5 by each of the rolls 4d, 4e, and 4f calculated by the material pass core calculation unit 13, and the caliber Based on the caliber bottom coordinates 4dp (xd, yd), 4ep (xe, ye), and 4fp (xf, yf) of the rolls 4d, 4e, and 4f calculated by the bottom coordinate calculation unit 12, the front rolling mill _3n The thrust amounts Sd, Se, and Sf (see FIG. 17) of the respective rolls 4d, 4e, and 4f at _-1 are calculated.
Calculation of the thrust amounts Sa, Sb and Sc of the rolls 4a, 4b and 4c in the final rolling mill _3n will be described with reference to FIG.

The thrust amounts Sa, Sb, and Sc of the rolls 4a, 4b, and 4c in the final rolling mill _3n are respectively
Sa=Xa-Xs (17)
Sb={Xs+H×cos(30)−Xb}/sin(30) (18)
Sc={Xs−H×cos(30)−Xc}/sin(30) (19)
Substituting xa calculated from the formula (7) into the formula (17),
Sa=xa−Xs (20)
can be expressed as

Also, xb calculated from formula (9) and H = {(xb-xc) × √3/2 + ya-(yb-yc)/2}/3 are substituted into formula (18),
Sb={Xs+{(xb−xc)×√3/2+ya−(yb−yc)/2}/3×cos(30)−xb}/sin(30) (21)
can be expressed as
Also, xc calculated from formula (11) and H={(xb-xc)×√3/2+ya-(yb-yc)/2}/3 are substituted into formula (19),
Sc={Xs−H={(xb−xc)×√3/2+ya−(yb−yc)/2}/3×cos(30)−xc}/sin(30) (22)
Calculation of the thrust amounts Sd, Se, and Sf of the rolls 4d, 4e, and 4f in the front rolling mill 3n _-1 will be described with reference to FIG.

The thrust amounts Sd, Se, and Sf of the rolls 4d, 4e, and 4f in the front rolling mill 3n _-1 are, respectively,
Sd=√{(yd−Ys) ² +(xd−Xs) ² }×sin(θd) (23)
Se=Xs−xe (24)
Sf=√{(xf−Xs) ² +(yf−Ys) ² }×sin(θf) (25)
can be expressed as
Here, θd=30−atan{(yd−Ys)/(xd−Xs)} and θf=atan{(yf−Ys)/(Xs−xf)}−30.

In addition, the roll opening calculation unit 15 of the roll information calculation device 10 calculates the material pass core PC (Xs, Ys) of the caliber 5 by each of the rolls 4a, 4b, and 4c calculated by the material pass core calculation unit 13, and the caliber The final rolling mill 3 _n , the opening degrees Ra, Rb, and Rc (see FIG. 15) of the respective rolls 4a, 4b, and 4c are calculated.
In addition, the roll opening calculation unit 15 of the roll information calculation device 10 calculates the material pass core PC (Xs, Ys) of the caliber 5 by each of the rolls 4d, 4e, and 4f calculated by the material pass core calculation unit 13, and the caliber Based on the caliber bottom coordinates 4dp (xd, yd), 4ep (xe, ye), and 4fp (xf, yf) of the rolls 4d, 4e, and 4f calculated by the bottom coordinate calculation unit 12, the front rolling mill _3n The opening degrees Rd, Re, and Rf (see FIG. 17) of the respective rolls 4d, 4e, and 4f at ₋₁ are calculated.

Calculation of the opening degrees Ra, Rb, and Rc of the rolls 4a, 4b, and 4c in the final rolling mill _3n will be described with reference to FIG.
The opening degrees Ra, Rb, and Rc of the rolls 4a, 4b, and 4c in the final rolling mill _3n are, respectively,
Ra=H−Da/2 (26)
Rb=H−Db/2 (27)
Rc=HDc/2 (28)
can be expressed as

Substitute Da = 0 and H = {(xb-xc) × √3/2 + ya-(yb-yc) / 2}/3 into formula (26), and Db = 0 and H = Substitute {(xb−xc)×√3/2+ya−(yb−yc)/2}/3 into equation (28) to obtain Dc=0 and H={(xb−xc)×√3/2+ya− (yb-yc)/2}/3,
Ra={(xb−xc)×√3/2+ya−(yb−yc)/2}/3 (29)
Rb={(xb−xc)×√3/2+ya−(yb−yc)/2}/3 (30)
Rc={(xb−xc)×√3/2+ya−(yb−yc)/2}/3 (31)
can be expressed as

Calculation of the opening degrees Rd, Re and Rf of the rolls 4d, 4e and 4f in the front rolling mill 3n _-1 will be described with reference to FIG.
The opening degrees Rd, Re, and Rf of the rolls 4d, 4e, and 4f in the front rolling mill 3n _-1 are, respectively,
Rd=√{(yd−Ys) ² +(xd−Xs) ² }×cos(θd) (32)
Re=Ys-ye (33)
Rf=√{(xf−Xs) ² +(yf−Ys) ² }×cos(θf) (34)
Here, θd=30−atan{(yd−Ys)/(xd−Xs)} and θf=atan{(yf−Ys)/(Xs−xf)}−30.

In addition, the product triangular angle calculation unit 16 of the roll information calculation device 10 calculates the material pass core PC (Xs _{, Ys} ), and caliber bottom coordinates 4ap (xa , ya), 4bp (xb, yb), 4cp (xc, yc); 4dp (xd, yd), 4ep (xe, ye), 4fp (xf, yf). Calculate

Specifically, the triangular angle of the round bar product S is calculated by "triangular angle = pre-final pass steel radius R _n-1 (see Fig. 18) - final pass steel radius R _n (see Fig. 18)". .
Here, the final pre-pass steel material radius R _n-1 is the material pass core PC (Xs, _Ys ) of the caliber 5 and the caliber bottom coordinates 4dp (xd , yd), 4ep(xe, ye), and 4fp(xf, yf) are calculated, and the average value of the calculated distances is represented.
Further, the final pass steel material radius _Rn is the material pass core PC (Xs, _Ys ) of the groove 5 and the caliber bottom coordinates 4ap (xa, ya), 4bp ( xb, yb) and 4cp (xc, yc) are calculated, and the calculated distances are averaged.

Further, the output unit 17 of the roll information calculation device 10 is configured by a display device, and the thrust of each roll 4a, 4b, 4c in the final rolling mill _3n calculated by the roll thrust amount calculation unit 14, which constitutes the roll information, is calculated. Amounts Sa, Sb, Sc and thrust amounts Sd, Se, Sf of each roll 4d, 4e, 4f in the front rolling mill 3 _n−1 , and each roll in the final rolling mill 3 _n calculated by the roll opening calculation unit 15 The opening degrees Ra, Rb, and Rc of 4a, 4b, and 4c, the thrust amounts Sd, Se, and Sf of each roll 4d, 4e, and 4f in the front rolling mill _3n-1 , and the round bar calculated by the product triangular angle calculation unit 16 The three angles of the product S are output.

Then, when rolling and manufacturing the next round bar product S, in the final rolling mill 3 _n , the thrust amount of each roll 4 a , 4 b , 4 c in the final rolling mill 3 _n output by the output unit 17 Each roll 4a, 4b, 4c is moved by the amount of Sa, Sb, Sc, and the opening degree Ra, Rb, Rc of each roll 4a, 4b, 4c in the final rolling mill _3n and the diameter of the next round bar product S The opening of each roll 4a, 4b, 4c is adjusted by the difference of .
In addition, when rolling and manufacturing the next round bar product _S , the operator uses the respective rolls _4d , 4e, The rolls 4d, 4e, and 4f are moved by the thrust amounts Sd, Se, and Sf of 4f, and the opening degrees Rd, Re, and Rf of the rolls 4d, 4e, and 4f in the front rolling mill 3n _-1 and the following The opening of each roll 4d, 4e, 4f is adjusted by the difference in the diameter of the round bar product S.

In addition, when rolling and manufacturing the next round bar product S, the operator determines each roll _4a , 4b, 4c and each roll 4d, 4e, 4f in the front rolling mill 3n _-1 are adjusted.
For example, as shown in FIGS. 18(a) and 18(b), the final pass steel material radius _Rn of the final rolling mill _3n matches the target radius _RT of the round bar product S, and the front rolling mill 3 When the final pre-pass steel material radius R _n-1 of _n -1 is larger than the target radius R _T of the round bar product S, the roll gaps of the rolls 4d, 4e, and 4f in the pre-rolling mill 3 _n-1 are set to the product three angles. It is narrowed by three angles of the round bar product S calculated by the calculation unit 16 .

Further, for example, as shown in FIGS. 19A and 19B, the final pass steel material radius _Rn of the final rolling mill _3n is smaller than the target radius _RT of the round bar product S, and the front rolling mill 3 When the final pre-pass steel material radius Rn-1 of _{n -1} matches the target radius _RT of the round bar product S, the roll gaps of the rolls 4a, 4b, and 4c in the final rolling mill _3n are set to the product triangular angle The three angles of the round bar product S calculated by the calculator 16 are widened.
Then, the following steel material SS is rolled by the rolling facility 3 including the final rolling mill 3 _n and the front rolling mill 3 _n−1 adjusted in this way, and the next round bar product S is manufactured.

Next, the flow of processing in the role information calculation device 10, which is the role information calculation method according to this embodiment, will be described with reference to FIG.
First, in step S1, the profile information acquisition unit 11 of the roll information calculation device 10 acquires profile information (profile information acquisition step). As described above, the profile information includes the measurement center MC for a predetermined cross section of the round bar product S, the x-coordinate values of the plurality of measurement points P1 to Pn on the outer peripheral surface of the predetermined cross section of the round bar product S, This information includes the y-coordinate value, the angle θ in the circumferential direction around the measurement core MC, and the radius R.

Next, in step S2, the caliber bottom coordinate calculation unit 12 of the roll information calculation device 10 calculates each roll in each of the final rolling mill 3 _n and the front rolling mill 3 _n−1 based on the profile information acquired in step S1. 4a, 4b, 4c; 4d, 4e, 4f caliber base coordinates 4ap (xa, ya), 4bp (xb, yb), 4cp (xc, yc); 4fp(xf, yf) is calculated (caliber base coordinate calculation step).
Here, the caliber bottom coordinates 4ap (xa, ya) are the coordinates of the center of the bottom forming the caliber 5 of the upper roll 4a of the final rolling mill _3n , as shown in FIG. The caliber bottom coordinates 4bp (xb, yb), as shown in FIG. 7, are similarly the coordinates of the center of the bottom forming the caliber 5 of the right roll 4b of the final rolling mill _3n . Further, the caliber bottom coordinates 4cp (xc, yc), as shown in FIG. 7, are similarly the coordinates of the center of the bottom forming the caliber 5 of the left roll 4c of the final rolling mill _3n .

On the other hand, the caliber bottom coordinates 4dp (xd, yd), as shown in FIG. 8, are the coordinates of the center of the bottom forming the caliber 5 of the right roll 4d of the front rolling mill 3n _-1 . The caliber bottom coordinates 4ep (xe, ye), as shown in FIG. 8, are similarly the coordinates of the center of the bottom forming the caliber 5 of the lower roll 4e of the front rolling mill 3n _-1 . Further, the caliber bottom coordinates 4fp (xf, yf), as shown in FIG. 8, are similarly the coordinates of the center of the bottom forming the caliber 5 of the left roll 4f of the front rolling mill 3n _-1 .
Regarding the calculation of the caliber bottom coordinates 4ap (xa, ya), specifically, based on the profile information about the upper roll 4a of the final rolling mill _3n acquired in step S1, The left cross-sectional area ΣAi-L formed by the bottom surface of the upper roll 4a on the left side (the side with the smaller x-coordinate value) with respect to the center line CL and the upper side on the right side with respect to the center line CL (the side with the larger x-coordinate value) is equal to the right cross-sectional area ΣAi-R formed by the bottom surface of the roll 4a of , that is, ΣAi-L/ΣAi=ΣAi-L/(ΣAi-L+ΣAi-R)=0.5. 4ap (xa, yp) is the caliber base coordinate.

Caliber base coordinates 4bp (xb, yb), 4cp (xc, yc); 4dp (xd, yd), 4ep (xe, ye), 4fp (xf, yf) are also calculated by the same method.
Next, in step S3, the material path core calculation unit 13 of the roll information calculation device 10 calculates the caliber bottom coordinates 4ap (xa, ya) of the rolls 4a, 4b, 4c; Final rolling mill 3 _n and front rolling mill 3 _{n- 1} (material path core calculation step).

Regarding the calculation of the material pass core PC (Xs, Ys) of the caliber 5 by each roll 4a, 4b, 4c in the final rolling mill _3n , as described above, Xs is calculated by the formula (15), and Ys is calculated by the formula (16). calculate.
In addition, in the material pass core PC (Xs, Ys) of the caliber 5 by each roll 4d, 4e, 4f in the front rolling mill 3n _-1 , Xs is the value calculated by the formula (15), and Ys is ( 16) Use the same value as calculated by the formula.
Next, in step S4, the roll thrust amount calculation unit 14 of the roll information calculation device 10 calculates the material pass core PC (Xs , Ys), and caliber bottom coordinates 4ap (xa, ya), 4bp (xb, yb), 4cp (xc, yc); 4dp of each roll 4a, 4b, 4c; (xd, yd), 4ep (xe, _ye ), 4fp (xf, yf), _each roll 4a, 4b, 4c; 4d, 4e, 4f thrust amounts Sa, Sb, Sc; Sd, Se, Sf are calculated (roll thrust amount calculation step).

As described above, the thrust amounts Sa, Sb, and Sc of the rolls 4a, 4b, and 4c in the final rolling mill _3n are calculated by formula (20) for Sa, formula (21) for Sb, and formula (22) for Sc. Calculated by
As described above, the thrust amounts Sd, Se, and Sf of the rolls 4d, 4e, and 4f in the front rolling mill 3n ₋₁ are calculated by formula (23) for Sd, formula (24) for Se, and formula (24) for Sf. (25) It is calculated by the formula.
Next, in step S5, the roll opening calculation unit 15 of the roll information calculation device 10 calculates the material pass core PC (Xs , Ys), and caliber bottom coordinates 4ap (xa, ya), 4bp (xb, yb), 4cp (xc, yc); 4dp of each roll 4a, 4b, 4c; (xd, yd), 4ep (xe, _ye ), 4fp (xf, yf), _each roll 4a, 4b, 4c; 4d, The openings Ra, Rb, Rc; Rd, Re, Rf of 4e, 4f are calculated (roll opening calculation step).

Regarding the calculation of the opening degrees Ra, Rb, and Rc of the respective rolls 4a, 4b, and 4c in the final rolling mill _3n , as described above, Ra is the formula (29), Rb is the formula (30), and Rc is the formula (31). Calculated by the formula.
Further, regarding the calculation of the opening degrees Rd, Re, and Rf of the respective rolls 4d, 4e, and 4f in the front rolling mill 3n _-1 , as described above, Rd is the expression (32), Re is the expression (33), and Rf is (34) It is calculated by the formula.
Next, in step S6, the product triangular angle calculation unit 16 of the roll information calculation device 10 calculates the material pass core PC (Xs , Ys), and caliber bottom coordinates 4ap (xa, ya ₎ of rolls 4a, 4b, _4c ; Based on 4bp (xb, yb), 4cp (xc, yc); 4dp (xd, yd), 4ep (xe, ye), 4fp (xf, yf), calculate the triangular angle of the round bar product S ( product triangular angle calculation step).

As described above, the triangular angle of the round bar product S is calculated by "triangular angle=pre-final pass steel radius R _n−1 (see FIG. 18)−final pass steel radius R _n (see FIG. 18)".
The final pre-pass steel material radius R _n-1 is the material pass core PC (Xs, Ys) of the groove 5 and the caliber bottom coordinates 4dp (xd, yd) of each roll 4d, 4e, 4f in the pre-rolling mill 3 _n-1. , 4ep(xe, ye), and 4fp(xf, yf) are calculated, and the average value of the calculated distances is expressed.
Further, the final pass steel material radius _Rn is the material pass core PC (Xs, _Ys ) of the groove 5 and the caliber bottom coordinates 4ap (xa, ya), 4bp ( xb, yb) and 4cp (xc, yc) are calculated, and the calculated distances are averaged.

Finally, in step S7, the output unit 17 of the roll information calculation device ₁₀ outputs the thrust amounts Sa, Sb, Sc and the thrust amounts Sd, Se, and Sf of the rolls 4d, 4e, and 4f in the front rolling mill _3n−1 , and the opening degree Ra of the rolls 4a, 4b, and 4c in the final rolling mill _3n calculated in step S5 , Rb, Rc and the thrust amounts Sd, Se, and Sf of the respective rolls 4d, 4e, and 4f in the front rolling mill 3n _-1 , and the three angles of the round bar product S calculated in step S6 (output step). .

Thus, the processing in the role information calculation device 10 ends.
When the next round bar product S is to be rolled and manufactured, the operator uses the _respective rolls _4a , The rolls 4a, 4b, 4c are moved by the thrust amounts Sa, Sb, Sc of 4b, 4c, and the opening degrees Ra, Rb, Rc of the rolls 4a, 4b, 4c in the final rolling mill _3n and the following The opening of each roll 4a, 4b, 4c is adjusted by the difference in the diameter of the round bar product S.
Further, when the worker rolls and manufactures the next round bar product S, in the front rolling mill 3 _{n−1 of} the rolling equipment 3, the Each roll 4d, 4e, 4f is moved by the thrust amount Sd, Se, Sf of each roll 4d, 4e, 4f, and _the opening degree Rd, The opening of each roll 4d, 4e, 4f is adjusted by the difference between Re, Rf and the diameter of the next round bar product S.

In addition, when rolling and manufacturing the next round bar product S, the operator determines each roll _4a , 4b, 4c and each roll 4d, 4e, 4f in the front rolling mill 3n _-1 are adjusted.
For example, as shown in FIGS. 18(a) and 18(b), the final pass steel material radius _Rn of the final rolling mill _3n matches the target radius _RT of the round bar product S, and the front rolling mill 3 When the final pre-pass steel material radius R _n-1 of _n -1 is larger than the target radius R _T of the round bar product S, the roll gaps of the rolls 4d, 4e, and 4f in the pre-rolling mill 3 _n-1 are set to the product three angles. It is narrowed by three angles of the round bar product S calculated by the calculation unit 16 .

Further, for example, as shown in FIGS. 19A and 19B, the final pass steel material radius _Rn of the final rolling mill _3n is smaller than the target radius _RT of the round bar product S, and the front rolling mill 3 When the final pre-pass steel material radius Rn-1 of _{n -1} matches the target radius _RT of the round bar product S, the roll gaps of the rolls 4a, 4b, and 4c in the final rolling mill _3n are set to the product triangular angle The three angles of the round bar product S calculated by the calculator 16 are widened.
Then, the following steel material SS is rolled by the rolling facility 3 including the final rolling mill 3 _n and the front rolling mill 3 _n−1 adjusted in this way, and the next round bar product S is manufactured.

As described above, according to the roll information calculation device 10 and the roll information calculation method according to the present embodiment, the profile information acquisition unit 11 (profile information acquisition step: step S1) obtains Profile information of the entire circumference including the measurement center MC (0, 0) for a predetermined cross section is acquired, and the caliber bottom coordinate calculation unit 12 (caliber bottom coordinate calculation step: step S2) obtains the profile information acquisition unit 11 (profile Information acquisition step: Based on the profile information acquired in step S1 ₎ , caliber bottom coordinates 4ap of each roll 4a, _4b , 4c; Calculate (xa, ya), 4bp (xb, yb), 4cp (xc, yc); 4dp (xd, yd), 4ep (xe, ye), 4fp (xf, yf). Further, the material pass core calculation unit 13 (material pass core calculation step: step S3) calculates the respective rolls 4a, 4b, 4c; Based on 4e, 4f caliber base coordinates 4ap (xa, ya), 4bp (xb, yb), 4cp (xc, yc); 4dp (xd, yd), 4ep (xe, ye), 4fp (xf, yf) Then, the material pass core PC (Xs, Ys) of the caliber 5 by _each of the _rolls 4a, 4b, 4c; Further, the roll thrust amount calculation unit 14 (roll thrust amount calculation step: step S4) calculates each roll 4a, 4b, 4c; 4d, Material path core PC (Xs, Ys) of caliber 5 by 4e, 4f and rolls 4a, 4b, 4c; , 4f based on the caliber base coordinates 4ap (xa, ya), 4bp (xb, yb), 4cp (xc, yc); 4dp (xd, yd), 4ep (xe, ye), 4fp (xf, yf) Then, the thrust amounts Sa, Sb, Sc; Sd, Se, Sf of the rolls 4a, 4b, 4c; 4d, 4e, 4f in the final rolling mill _3n and the front rolling mill 3n _-1 are calculated. Further, the roll opening degree calculation unit 15 (roll opening degree calculation step: step S5) calculates the respective rolls 4a, 4b, 4c; Material path core PC (Xs, Ys) of caliber 5 by 4e, 4f and rolls 4a, 4b, 4c; , 4f based on the caliber base coordinates 4ap (xa, ya), 4bp (xb, yb), 4cp (xc, yc); 4dp (xd, yd), 4ep (xe, ye), 4fp (xf, yf) Then, the opening degrees Ra, Rb, Rc; Rd, Re, Rf of the rolls 4a, 4b, 4c; 4d, 4e, 4f in the final rolling mill _3n and the front rolling mill 3n _-1 are calculated.

As a result, the final rolling can be performed without determining in advance the relationship between _the reduction change of the final rolling mill 3 _n and the front rolling mill 3 _n−1 and the width direction dimensional change and vertical dimensional change on the delivery side of the final rolling mill 3 n. rolls 4a, 4b, 4c; 4d, 4e, 4f in the rolling mill _3n and the front rolling mill 3n _-1 ; By calculating the roll information including the thrust amounts Sa, Sb, Sc; Sd, Se, Sf of 4e, 4f, the shape of the round bar product S can be approximated to a perfect circle.
In particular, a 3-roll mill is used in the final rolling mill _3n and the front rolling mill 3n _-1 , and the steel material SS is rolled down from three directions by rolls 4a, 4b, 4c; 4d, 4e, and 4f. The shape of is likely to be triangular, but even in this case, the opening degrees Ra, _Rb , and Rc of _the rolls 4a, 4b, and 4c; By calculating roll information including Rd, Re, Rf and thrust amounts Sa, Sb, Sc; Sd, Se, Sf of rolls 4a, 4b, 4c; 4d, 4e, 4f; You can get closer to a perfect circle.

Further, according to the roll information calculation device 10 and the roll information calculation method according to the present embodiment, each of the final rolling mill 3 _n and the front rolling mill 3 _n−1 consists of a 3-roll mill, and the roll information is based on the round bar product S including the triangular angle of Then, in the roll information calculation device 10 and the roll information calculation method according to the present embodiment, the product triangular angle calculation unit 16 (product triangular angle calculation step; step S6), the material pass core calculation unit 13 (material pass core calculation step: The material path core PC (Xs, Ys) of the caliber 5 by each of the rolls 4a, 4b, 4c; Caliber bottom coordinates 4ap (xa, _ya ), 4bp (xb, _yb ) of rolls 4a, 4b, 4c; ), 4cp (xc, yc); 4dp (xd, yd), 4ep (xe, ye), 4fp (xf, yf).

As a result, even when a 3-roll mill is used for the final rolling mill _3n and the front rolling mill 3n _-1 , and the steel material SS is rolled down from three directions by the rolls 4a, 4b, 4c; 4d, 4e, and 4f, the round bar product By calculating the triangular angles of S, the shape of the round bar product S can be brought closer to a perfect circle.
Then, in the adjustment of the rolling equipment ₃ , _the opening degree Ra of each roll 4a, 4b, 4c; , Rb, Rc; Rd, Re, Rf and the thrust amounts Sa, Sb, Sc; Sd, Se, Sf of the rolls 4a, 4b, 4c _; and adjust the front rolling mill 3n _-1 .

When performing this adjustment _, the operator checks the thrust amounts Sa, _Sb , Each roll 4a, 4b, 4c is moved by the amount of Sc, and the difference between the opening degrees Ra, Rb, Rc of each roll 4a, 4b, 4c in the final rolling mill _3n and the diameter of the next round bar product S The opening degrees of the rolls 4a, 4b and 4c are adjusted.
In addition _, the operator can obtain the thrust amounts Sd, Se _, Each roll 4d, 4e, 4f is moved by the amount of Sf, and the difference between the opening degrees Rd, Re, Rf of each roll 4d, 4e, 4f in the front rolling mill 3n _-1 and the diameter of the next round bar product S The opening of each roll 4d, 4e, 4f is adjusted only by

Furthermore, when rolling and manufacturing the next round bar product S, the operator can, based on the triangular angle of the round bar product S output by the output unit 17 according to the shape of the already rolled round bar product S, The rolls 4a, 4b, 4c in the final rolling mill _3n and the rolls 4d, 4e, 4f in the front rolling mill 3n _-1 are adjusted.
Further, in the production of the round bar product S, the steel material SS is rolled by the rolling equipment 3 including the final rolling mill 3 _n and the front rolling mill 3 _n−1 adjusted by this adjustment method of the rolling equipment 3 .
As a result, the shape of the manufactured round bar product S can be approximated to a perfect circle.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications and improvements can be made.
For example, although a 3-roll mill is used for each of the final rolling mill _3n and the front rolling mill 3n _-1 , a 2-roll mill or a 4-roll mill may be used.
In addition, the output unit 17 of the roll information calculation device 10 is designed to output roll information. The final rolling mill 3 _n and the front rolling mill 3 _n−1 in the equipment 3 may be controlled.

In order to verify the effects of the present invention, the rolling equipment 3 shown in FIG.
In the comparative example, in the rolling mill ₃ , the thrust amounts Sa, Sb, Sc; Sd, Se, Sf of the respective rolls 4a, 4b, 4c _; without adjusting the rolls 4a, 4b, 4c;

On the other hand, in the embodiment, in the rolling mill ₃ , the thrust amounts Sa _, Sb of the rolls 4a, 4b, 4c; , Sc; Sd, Se, Sf and each roll 4a, 4b, 4c; 4d, 4e, 4f _; and _the thrust amounts Sa, Sb, Sc; Sd, Se, and Sf of the rolls 4a, 4b, 4c; , _4f , and the openings Ra, Rb, Rc; Rd, Re, Rf of the rolls 4a, 4b, _4c; The steel material SS was rolled by adjusting the opening degrees of the respective rolls 4a, 4b, 4c; 4d, 4e, 4f by the difference of .

FIG. 20 shows the results of the comparative example, and FIG. 21 shows the results of the example.
20 and 21, _R1 is the radius of the round bar product S at a circumferential angle of 120° in the x-axis positive direction around the measurement center MC of the round bar product S, and _R2 is the circumferential angle. is the radius of the round bar product S at 0° in the x-axis positive direction around the measuring center MC of the round bar product S, and _R3 is the circumferential angle around the measuring center MC of the round bar product S along the x-axis The radius of the round bar product S at 120° in the negative direction, _r1 is the radius of the round bar product S at a circumferential angle of 60° in the x-axis negative direction around the measurement center MC of the round bar product S. , _r2 is the radius of the round bar S at the point where the circumferential angle is 180° in the x-axis positive direction around the measurement center MC of the round bar S, and _r3 is the circumferential angle of the round bar S. It is the radius of the round bar product S at 60° in the positive direction of the x-axis centered on the measuring core MC.
In the case of the comparative example, R ₁ ≠r ₁ , R ₂ ≠r ₂ , R ₃ ≠r ₃ , and the round bar product S was not perfectly circular.
On the other hand, in the case of the example, R ₁ ≈r ₁ , R ₂ ≈r ₂ , R ₃ ≈r ₃ and the roundness of the round bar product S was improved.

1 steel bar rolling line 2 heating furnace 3 rolling equipment 3 ₁ to 3 _n-1 , 3 _n No. 1 rolling mill to No. n-1 rolling mill (front rolling mill), No. n rolling mill (final rolling mill)
4a, 4b, 4c, 4d, 4e, 4f Roll 5 Groove 10 Roll information calculation device 11 Profile information acquisition unit 12 Caliber bottom coordinate calculation unit 13 Material path core calculation unit 14 Roll thrust amount calculation unit 15 Roll opening degree calculation unit 16 Product triangular angle calculation unit 17 Output unit S Round bar product SS Steel material

Claims (6)

When rolling a steel material to be a round bar product by a rolling facility including a final rolling mill consisting of a 2-roll mill, a 3-roll mill, or a 4-roll mill and a front rolling mill for the final rolling mill, each roll in the final rolling mill and the front rolling mill A roll information calculation device that calculates roll information including the opening degree of and the thrust amount of each roll,
a profile information acquisition unit that acquires profile information of the cross section of the round bar product measured by a dimension measuring instrument;
a caliber bottom coordinate calculation unit that calculates caliber bottom coordinates of each roll in each of the final rolling mill and the front rolling mill based on the profile information acquired by the profile information acquisition unit;
a material pass core calculation unit for calculating the material pass core of the caliber by each roll in each of the final rolling mill and the front rolling mill, based on the caliber bottom coordinates of each roll calculated by the caliber bottom coordinate calculation unit; ,
Based on the caliber material pass core of each roll calculated by the material pass core calculation unit and the caliber bottom coordinates of each roll calculated by the caliber bottom coordinate calculation unit, the final rolling mill and the front rolling a roll thrust amount calculation unit that calculates the thrust amount of each roll in each machine;
Based on the caliber material pass core of each roll calculated by the material pass core calculation unit and the caliber bottom coordinates of each roll calculated by the caliber bottom coordinate calculation unit, the final rolling mill and the front rolling and a roll opening degree calculation unit for calculating the opening degree of each roll in each roll information calculating device. Each of the final rolling mill and the front rolling mill consists of a 3-roll mill, and the roll information includes the three angles of the round bar product, and the caliber material pass by each roll calculated by the material pass core calculation unit A product triangular angle calculator that calculates the triangular angle of the round bar product based on the core and the caliber bottom coordinates of each roll in each of the final rolling mill and the front rolling mill calculated by the caliber bottom coordinate calculator. with
2. The roll information calculation device according to claim 1 , wherein the triangular angle of the round bar product is calculated by the following formula .
Triangular angle of round bar product = Radius of steel material before final pass - Radius of final pass steel material
Here, the final pre-pass steel material radius is the material pass core of the caliber by each roll calculated by the material pass core calculation unit and the caliber bottom coordinates of each roll in the front rolling mill calculated by the caliber bottom coordinate calculation unit. are calculated, and the average value of the calculated distances is expressed.
Further, the final pass steel material radius is the distance between the material pass core of the caliber by each roll calculated by the material pass core calculation unit and the caliber bottom coordinates of each roll in the final rolling mill calculated by the caliber bottom coordinate calculation unit. Each distance is calculated, and the average value of the calculated distances is represented. When rolling a steel material to be a round bar product by a rolling facility including a final rolling mill consisting of a 2-roll mill, a 3-roll mill, or a 4-roll mill and a front rolling mill for the final rolling mill, each roll in the final rolling mill and the front rolling mill A roll information calculation method for calculating roll information including the opening degree of and the thrust amount of each roll,
a profile information acquisition step of acquiring profile information of the cross section of the round bar product measured by a dimension measuring instrument;
a caliber bottom coordinate calculating step of calculating the caliber bottom coordinates of each roll in each of the final rolling mill and the front rolling mill based on the profile information acquired in the profile information acquiring step;
a material pass core calculating step of calculating the material pass core of the caliber by each roll in each of the final rolling mill and the front rolling mill based on the caliber bottom coordinates of each roll calculated in the caliber bottom coordinate calculating step; ,
Based on the material path core of the caliber by each roll calculated in the material path core calculation step and the caliber bottom coordinates of each roll calculated in the caliber bottom coordinate calculation step, the final rolling mill and the front rolling a roll thrust amount calculation step for calculating the thrust amount of each roll in each machine;
Based on the material path core of the caliber by each roll calculated in the material path core calculation step and the caliber bottom coordinates of each roll calculated in the caliber bottom coordinate calculation step, the final rolling mill and the front rolling and a roll opening calculating step of calculating the opening of each roll in each of the roll information. Each of the final rolling mill and the front rolling mill consists of a three-roll mill, the roll information includes the three angles of the round bar product, and the material pass core of each roll calculated in the material pass core calculation step; a product triangular angle calculation step of calculating the triangular angle of the round bar product based on the caliber bottom coordinates of each roll in each of the final rolling mill and the front rolling mill calculated in the caliber bottom coordinate calculation step;
4. The roll information calculation method according to claim 3 , wherein the triangular angle of the round bar product is calculated by the following formula .
Triangular angle of round bar product = Radius of steel material before final pass - Radius of final pass steel material
Here, the final pre-pass steel material radius is the material pass core of the caliber by each roll calculated by the material pass core calculation unit and the caliber bottom coordinates of each roll in the front rolling mill calculated by the caliber bottom coordinate calculation unit. are calculated, and the average value of the calculated distances is expressed.
Further, the final pass steel material radius is the distance between the material pass core of the caliber by each roll calculated by the material pass core calculation unit and the caliber bottom coordinates of each roll in the final rolling mill calculated by the caliber bottom coordinate calculation unit. Each distance is calculated, and the average value of the calculated distances is represented. 5. A method for adjusting rolling equipment, wherein the roll information calculated by the roll information calculation method according to claim 3 is used to adjust the final rolling mill and the front rolling mill. A method of manufacturing a round bar product, wherein a steel material is rolled by rolling equipment including a final rolling mill and a front rolling mill adjusted by the method for adjusting rolling equipment according to claim 5.

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