KR20040099500A - buckling - Google Patents

Abstract

PURPOSE: To provide an apparatus and a method for controlling grip of workpiece to prevent distortion of the workpiece, wherein side guides are controlled such that a side surface of the workpiece is gripped by the side guides when a bloom is metal-in rolling rolls, and gripping force is controlled to prevent initial generation of buckling, suppress formation of surface defects on the surface of the workpiece, and improve quality of the workpiece accordingly. CONSTITUTION: In an apparatus for controlling grip of a workpiece rolled by rolling rolls driven by a motor(14), the apparatus comprises a detecting part for load at rolling roll motor(51); a workpiece position detecting part(52) comprising a plural sensors for detecting rolling starting and rolling completion positions of the workpiece at input and output sides of the rolling rolls; a grip time calculating part(53) for calculating a grip time of the workpiece based on proceeding distance and proceeding speed of the workpiece set from a workpiece rolling start detecting time point by the workpiece position detecting part; a workpiece grip control part(54) for controlling grip of the workpiece by a side guide of the input side if load values detected by the rolling roll motor load detecting part are the same as or more than a set load value after rolling start of the workpiece is detected by the workpiece position detecting part, controlling grip of the workpiece using a side guide(12) of the output side when it is a workpiece grip time calculated by the grip time calculating part, and releasing grip of the workpiece if the load values detected by the rolling roll motor load detecting part are the same as or less than the set load value; and the side guides(12) which guide the workpiece transferred by transfer rolls(11) for transferring the workpiece to a set caliber of the rolling rolls from both sides, are operated by control of the workpiece grip control part, and include rolls, installed at certain parts of the workpiece side, for preventing friction.

Description

Material grip control device for preventing torsion of material and its method {buckling}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grip control apparatus and a method of controlling a material for preventing torsion of a material in a reversible rolling mill of a rough rolling process during billet production of a steel mill. By controlling the side of the furnace material to grip and controlling the force of the grip, it is possible to prevent the occurrence of buckling at the beginning and to suppress the occurrence of surface defects appearing on the surface of the material. The present invention relates to a grip control apparatus and a method of controlling a material for preventing material distortion, which can improve quality.

In general, in the rolling process in the reversible rolling mill of the rough rolling process of the billet production of steel mills, the process of producing a billet (bloom) by using a bloom (boom), The width of the width and the width of the vertical form different. In the rough rolling process, this section is produced through the appropriate reduction of the width of the same width and length as the final desired billet size material (190mm X 190mm for 120 billets, 220mmX220mm for 160 billets). The billet is produced by supplying it to the continuous rolling mill of the finishing rolling process.

1 is a plan view of a conventional reversible rolling mill, FIG. 2 is a correlation diagram of a conventional side guide and a raw material, and FIG. 3 is a perspective view of a conventional reversible rolling mill.

1 to 3, the reversible rolling mill used in the rough rolling process is carried with a feed roll 11 for conveying the material for rolling, and the appropriate carry for the material for rolling conveyed by the feed roll (11) A side roll 12 for guiding to a caliber, a rolling roll 13 on which a box-type caliber for rolling a material is formed, and the rolling roll 13 are positively and inverted. Adjusting the position of the stationary motor 14 for rotating, the guide plate 15 formed for smooth input and output of the material at the end of the rolling roll 13 side of the side guide 12, the side guide 12 Guide drive motor 16 and a manipulator finger 17 for rotating the material 90 degrees.

According to such a rolling mill, when a boil heated at an appropriate temperature in a heating furnace is transferred to the front of the rolling roll 13 by the transfer roll 11, the side guide 12 is moved to attach to the side guide 12 and is integrated. Using the manipulator 17, which rotates to inject the material into the desired caliber of the rolling roll 13, and advances to the side guide 12, the center of the material and the first rolling caliber If the center of the caliber is matched, the left and right side guides 12 retreat a predetermined distance (20 mm) to stand by, and drive the feed roll 11 to blow the blow roll onto the rolling roll 13. Is rolled while being reduced by receiving the reduction in the rolling roll (13).

In this rolling process, the material rolled in the forward direction is reduced in height, the width thereof is slightly increased, and the length thereof is increased. Thus, once rolled (one pass) material is rotated again, the rolling roll 13 is rotated in the reverse direction. Rolling is carried out, in which the roll roll 13 stops and the side guide 12 is moved to the next carriber to coincide with the center of the carver and the center of the material after the bushing leaves the rolling roll. It will repeat the process. In other words, when a predetermined pass is completed, a material having a desired size can be obtained.

Pass and reduction ratio in this rolling process as an example is shown in Table 1 and Table 2.

300 × 400 B / L Rough Rolling Pass Schedule (220) Pass Carrier Pressure points section Rolling reduction Explosion Remarks 300.0 400.0 Turn One One 210 350.0 312.5 50.0 12.5 2 One 160 300.0 325.0 50.0 12.5 Turn 3 2 145 285.0 310.0 40.0 10.0 4 2 100 240.0 321.3 45.0 11.3 Turn 5 3 130 270.0 252.8 51.3 12.8 6 3 68 208.0 268.3 62.0 15.5 Turn 7 5 80 220.0 220.1 48.3 12.1

300 × 400 B / L Rough Rolling Pass Schedule (190) Pass Carrier Pressure points section Rolling reduction Explosion Remarks 300.0 400.0 Turn One One 210 350.0 312.5 50.0 12.5 2 One 160 300.0 325.0 50.0 12.5 Turn 3 2 145 285.0 310.0 40.0 10.0 4 2 100 240.0 321.3 45.0 11.3 Turn 5 3 130 270.0 252.8 51.3 12.8 6 3 75 208.0 268.3 55.0 13.8 Turn 7 5 85 225.0 225.4 41.6 10.4 8 39 179.0 236.9 46.0 11.5 Turn 9 60 190.0 190.7 46.9 11.7

In this rolling process, the material is rolled by being blown into the rolling roll 13, in which the material is reduced in height and its length is increased in the rolling direction and its width is increased in the width direction. Various complex phenomena, such as rolling, appear.

In this rolling process, various phenomena such as reduction, stretching, widening, and buckling occur, wherein the buckling phenomenon is a phenomenon in which the material is twisted during rolling to determine a reduction amount to prevent this. Do it. However, such a buckling phenomenon may cause undesirable changes when deviating from the initial design value due to various factors such as the cross-sectional shape of the material, segregation inside the material, heating temperature, and heating of the material piece, and may cause buckling. When the same pressing force is applied under the conditions, there is a problem in that a buckling phenomenon occurs and a twisting phenomenon of the material during rolling occurs.

This buckling phenomenon refers to a phenomenon in which the height of the material, which was maintained in the vertical state, is inclined laterally when a material having a rectangular cross section is pressurized from the upper surface, which is described as shown in FIG. 4.

4 is an exemplary view of the occurrence of buckling.

Referring to FIG. 4, in the case of the box-type carrier, such a phenomenon usually appears when the ratio of height and width is greater than 1, and the larger the ratio and the larger the reduction ratio, the greater the buckling phenomenon. In addition, the increase in the buckling phenomenon is a case of poor material right angles (a phenomenon in which the four sides forming each side of the bulge does not form a right angle and is inclined during production). In addition, in the continuous casting process, various mixtures exist in a molten state, and the phenomenon of gathering at a certain part inside the material according to each property is called segregation (21). It is usually formed in the lower part.

The central segregation 21 has different elongation due to the reduction of pressure and buckling occurs in the segregation 21, and it is also necessary to heat up to the desired temperature in the heating furnace, but not enough heating. The elastic resistance of the is increased, the buckling phenomenon is increased by this elastic resistance, and even if the heating temperature is different on each side of the material may be caused by the difference in combustion rate. In addition, the buckling phenomenon is aggravated by various factors, such as a roll spring phenomenon or an abnormality of the roll fixed bearing due to the difference in the pressing force on the roll during rolling. That is, even if the same pressing force is applied to the material of the same size, the material is buckled by various factors such as the squareness of the material, the shape of the segregation 21 of the material, the heating temperature, the single heating, the degree of the roll spring, and the aging degree of the bearing. This will happen.

This buckling phenomenon occurs mainly in the blowing angle of the roll 13 and occurs in the rear of the rolling angle of the blowing angle entrance side appears to be in the form of twisting material. Also, the torsion generated at the neutral point may appear behind the neutral point. The buckling generated at the roll entrance angle is twisted to the rear with respect to the entrance angle of the roll. This twist gives a constant gap between the side guide 12 and the material to facilitate the progress of the material. The buckling phenomenon is intensified therebetween and the material being blown in the space existing between the side guide 12 and the material is blown out of the cab of the rolling roll 13 to the flange to give a great impact to the roll. If the buckling occurs relatively little due to the phenomenon, the material edges and the flanges of the roll 13 collide with each other to increase the occurrence of overlap and scap flaws. After returning using the return line, it goes through complicated processes such as cutting, cropping, and returning to the appropriate size It is.

In addition, the buckling generated at the exit angle does not impact the rolling roll 13, but it cannot be produced as a finished product, so it can be produced using a return line, and then cut to an appropriate size, cropped, and returned to the steelmaking process. It goes through a complicated process. This torsion can be controlled initially by braking with very little force, but it can not be controlled when it is out of a certain range. In addition, the rolling speed cannot be set high due to the occurrence of buckling, which also causes a problem of lowering the rolling productivity.

The present invention has been proposed to solve the above problems, the object of which is to control the grip of the side of the material with the side guide at the time when the bloom is blown into the rolling roll, and also the force of the grip By controlling, it is possible to prevent the occurrence of buckling in the early stage, to suppress the occurrence of surface defects appearing on the surface of the material, and thereby the grip control device of the material for preventing the material distortion that can improve the quality of the material and the method To provide.

1 is a plan view of a conventional reversible rolling mill.

2 is a correlation diagram of a conventional side guide and the raw material.

3 is a perspective view of a conventional reversible rolling mill.

4 is an exemplary view of the occurrence of buckling.

5 is a block diagram of a grip control device of the raw material according to the present invention.

6 is a perspective view of a rolling mill according to the present invention.

7 is a plan view of a rolling mill according to the present invention.

8 is a layout view of each sensor of the work position detection unit according to the present invention.

9 is an exploded perspective view of the side guide and the guide plate according to the present invention.

10 is an overall flowchart of a grip control method of a material according to the present invention.

11 is a flowchart showing a material grip process according to the present invention.

12 is a flowchart of the material grip control process during the rolling process of one pass according to the present invention.

Figure 13 is a state diagram for each step in the rolling process of the present invention.

Explanation of symbols on the main parts of the drawings

11: feed roll 12: side guide

12-1,12-2: Entry side guide 12-3,12-4: Exit side guide

13 rolling roll 14 rolling roll motor

15: guide plate 15-1, 15-2: entrance guide plate 15-3, 15-4: exit guide plate 16: guide drive motor

17: Manipulator 21: Segregation

22: grip roll 23: cooling nozzle

24: bearing 25: fixed shaft

26: rotating shaft 27: fastening hole

28: cylinder 29: anti-friction roll

S1-S4: Entry and exit sensor S5, S6: Deceleration reference sensor

51: rolling roll motor load detection unit 51 52: material position detection unit

53: grip time calculation unit 54: material grip control unit

In order to achieve the above object of the present invention, the apparatus of the present invention is a device for controlling the grip of the material rolled by a rolling roll driven by a motor, the rolling roll motor load detection unit for detecting the load of the rolling roll motor ; A material position detection unit including a plurality of sensors for detecting a rolling start and a rolling completion position of the material on both input and output sides of the rolling roll; A grip time calculation unit configured to calculate a grip time of a workpiece based on a traveling distance and a traveling speed of the workpiece set by the workpiece position detector from a rolling start detection of the workpiece; If the detection load by the rolling roll motor load detection unit is greater than or equal to the set load after the rolling start detection of the raw material by the raw material position detecting unit, the grip of the raw material is controlled by the entry side guide, and the grip time of the raw material by the grip time calculating unit is A material grip control unit which controls the grip of the material by using the exit side guide, and releases the grip of the material when the detection load by the rolling roll motor load detector is less than or equal to a set load; And an anti-friction roll which guides the material conveyed by the conveying roll for conveying the material to the set caliber of the rolling roll on both sides, operates under the control of the material grip control unit, and is installed in a predetermined portion on the material side. It characterized by having a side guide.

In addition, the method of the present invention, in the method for controlling the grip operation of the raw material through the side guides provided on the entry and exit sides of the rolling roll with respect to the raw material rolled by the rolling roll, Selecting and controlling the blowing of material into the rolling roll; Performing an inlet grip of a material with an inlet side guide when the detection load by the rolling roll motor load detector is greater than or equal to a set load after detecting the start of rolling, which is the time point at which the material into the previously selected carrier enters the roll; Performing a grip of a material through a side guide at the exit side of the rolling roll when a predetermined time elapses after the rolling start detection; And releasing the grip of the material when the detection load by the rolling roll motor load detection unit is less than or equal to the set load.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings referred to in the present invention, components having substantially the same configuration and function will use the same reference numerals.

5 is a configuration diagram of a grip control apparatus of a raw material according to the present invention, Figure 6 is a perspective view of a rolling mill according to the present invention, Figure 7 is a plan view of a rolling mill according to the present invention.

5 to 7, the grip control apparatus of the material for preventing the torsion of the material according to the present invention includes a rolling roll motor load detection unit 51 for detecting a load of the motor 14 of the rolling roll 13, and Raw material position detection unit 52 including a plurality of sensors for detecting the starting and rolling completion position of the raw material on both sides of the input and output of the rolling roll 13, and the starting point of the rolling detection of the raw material by the raw material position detection unit 52 A grip time calculation unit 53 for calculating a grip time of the material on the basis of the traveling distance and the moving speed of the material set from the above, and the rolling roll motor load detection unit after detecting the rolling start of the material by the material position detection unit 52 ( If the detection load by 51) is greater than or equal to the set load, the grip of the material is controlled by the entry side guide, and when the grip time of the material by the grip time calculation unit 53 is reached, the material is released using the exit side guide 12. The grip is controlled, and when the detection load by the rolling roll motor load detection unit 51 is less than or equal to the set load, the material grip control unit 54 for releasing the grip of the material and the feed roll 11 for transferring the material. Guides the material to be transported from the both sides to the set carrier of the rolling roll 13, and is operated by the control of the material grip control unit 54, and includes an anti-friction roll 29 provided on a certain side of the material. It includes a side guide 12.

In addition, the side guide control device of the present invention is installed at the end of the side guide 12 on the rolling roll 13 side to move toward the material, the grip of the material under the control of the material grip control unit 54 and It further comprises a guide plate 15 for releasing.

In addition, the grip time calculation unit 53 is the first grip time (T1) and the second of the workpiece on the basis of the traveling distance and the moving speed of the workpiece set by the workpiece position detection unit 52 from the beginning of the rolling start detection of the workpiece And to calculate the grip time T2.

The material grip control unit 54 of the present invention is configured to grip the material using the entrance guide plate when detecting the material by the material detection sensor installed at the entrance side of the rolling roll, and to detect the load of the rolling roll motor 14. When the detection load by the roll motor load detection unit 51 corresponds to the rolling roll entry load, the material is gripped by using the entrance side guide, and the material is detected at the time of material detection by the material detection sensor installed at the entrance side of the rolling roll. The first grip time T1 is calculated, and when the calculated grip time of the material is reached, the material is gripped using the exit guide plate, and the material is detected at the time of material detection by a material detection sensor installed at the entrance side of the rolling roll. Calculates a second grip time T2, and when the calculated grip time arrives, the workpiece is gripped using the exit side guide. Made rock.

8 is a layout view of each sensor of the work position detection unit according to the present invention.

Referring to FIG. 8, the material position detection unit 52 detects a plurality of sensors installed at a predetermined position to detect a progress state of a material such as a rolling start and a rolling completion position of the material on both input and output sides of the rolling roll 13. Includes, the plurality of sensors are the entrance and exit reference sensor (S1-S4) for detecting the time when the raw material is input to the roll roll 13 and the output time, and the deceleration reference sensor for detecting the completion of rolling of the material in advance (S5, S6), the entrance reference sensor (S1-S4) may be installed in the same position of each of the entrance and exit in pairs to complement each other, or the entrance and exit for stepwise detection for accuracy of detection It may be installed at different positions in each exit side.

9 is an exploded perspective view of the side guide and the guide plate according to the present invention.

9, the guide plate 15 is a fastening hole for rotatably fastening the plate body 15a and the side guide 12 to the side guide 12 so as to be rotatable within a set range in a material side direction. And a cylinder 28 for operating the plate body 15a, which is installed at the 27 and the rotating shaft 26 and the roll fixing shaft 25 provided at the side guide 12 and the plate body 15a, respectively. In order to reduce friction with the material, a grip roll 22 installed at the end of the plate body 15a and a fixed shaft 25 are fixed and inserted into the center of the grip roll 22. 24 and a cooling nozzle 23 for cooling the grip roll 22. The guide plate shown in FIG. 9 is an example of the present invention and is not limited to FIG. 9.

Hereinafter, the operation and effects of the present invention will be described in detail with reference to FIGS. 5 to 13.

10 is an overall flowchart of a grip control method of a material according to the present invention.

5 to 10 for controlling the grip operation of the material through the side guide 12 installed on the entry and exit side of the rolling roll 13 for the material rolled by the rolling roll 13 of the present invention. In the following description, first, a carver of a rolling roll 13 into which a raw material is to be blown is selected to control the blowing of the raw material into the rolling roll 13 (S111-S113).

Next, when the detection load by the rolling roll motor load detection unit 51 is greater than or equal to the set load after detection of the rolling start time, which is the time point at which the raw material enters the pre-selected carrier of the rolling roll 13, the entrance side guide When the inlet grip of the furnace material is performed and a predetermined time elapses after the rolling start detection, the outlet grip of the material is performed through the side guide 12 on the outlet side of the rolling roll 13 (S114-S115 or / and S118-S119).

Then, when the detection load by the rolling roll motor load detection unit 51 is less than or equal to the set load, the grip of the material is released (S116-S117 or / and S120-S121).

After performing the above process, if the desired size of the material is finished rolling, but if it is not the desired size after turning the material (S222, S123) repeat the above process from the beginning again to make the material of the desired size Will be repeated. That is, as shown in Figure 12, in order to produce a material of the desired size, a process such as forward rolling (1 pass) and / or reverse rolling (2 passes) may be repeatedly performed.

11 is a flowchart showing a material grip process according to the present invention.

5 to 11, in the inlet grip performing step, when the material is detected by the material detecting sensor installed at the inlet side of the rolling roll, the material is gripped by using the inlet guide plate, and the rolling roll motor 14 When the detection load by the rolling roll motor load detection unit 51 installed to detect the load of the rolling roll entry load, the grip of the material is performed using the entrance side guide (S131-S333).

In the outgoing grip performing step, the first grip time T1 of the material is calculated at the time of the material detection by the material detection sensor installed at the entrance side of the rolling roll, and when the calculated grip time of the material is reached, the exit guide When the material is gripped using the plate, the second grip time T2 of the material is calculated at the time of the material detection by the material detection sensor installed at the entrance side of the rolling roll, and when the calculated grip time is reached, Using the exit side guide to grip the material (S134-S136).

On the other hand, what is important in the material grip process of the present invention is "when to grip the material" and "how much power to grip" is very important. For example, if the grip roll 22 grips too early, a rolling miss may occur due to the progression of the material, that is, to transfer the material if the grip is made before the material is blown. Since the material must be advanced only by the force of the conveying roll 11, there is a problem that the material does not progress due to the friction force between the surface of the gripped material and the surface of the side guide 12. On the other hand, if the material is gripped too late, the buckling control timing caused by the various factors described above is missed, and thus the buckling of the material cannot be suppressed properly. In addition, even when the material is blown, if the proper grip force is not maintained, the force applied to the driving gear of the side guide 12 may increase the mechanical fatigue, which may cause damage, and the overload of various machinery and the progress of the material may be smooth. Failure to do so may cause equipment damage.

Therefore, in the entry and exit grip performing steps, it is important to control the proper grip force even during the grip operation. For this purpose, the side guide 12 is advanced to the material side and the rolled material is closely contacted with the side guide 12. The load of the drive motor 16 of the side guide 12 is detected, and the load of the drive motor 16 is controlled according to the comparison difference while comparing the detected load with a preset load. Appropriate pressure is applied between the side guides 12. In this way, the torsion phenomenon occurring between the side guide 12 and the raw material can be suppressed or prevented by the pressing force of the side guide 12 without applying a braking force to the moving of the raw material.

12 is a flowchart of the material grip control process during the rolling process of one pass according to the present invention.

The grip control of the material of the present invention may be applied to forward rolling (one pass) and / or reverse rolling (two passes), and the grip control process performed during the rolling process corresponding to one of the passes will be described with reference to FIG. 12. First, when the feed roll (roller table) 11 and the rolling roll motor 14 are started at a primary speed (S141), and the sensors S3 and S1 of the material position detection unit 52 are turned on, The guide plates 15-1 and 15-2 are gripped and the rolling roll 13 is decelerated at a secondary speed (S142). Then, the load of the rolling motor 14 by the rolling roll motor load detection unit 51 is a rolling roll entry load, for example, a state in which the material is stably blown into the rolling roll 13, that is, 20 of the maximum load. If it is more than%, the load relay, which is not shown in the load detector is turned on and the rolling roll 13 is accelerated at a third speed, and the entrance side guides 12-1 and 12-2 are gripped (S144). Subsequently, the detection load is monitored while advancing the drive motor 16 of the side guide 12, and the drive motor is controlled according to the detected load of the motor. That is, when the detection load is less than 20% of the maximum load, the drive motor 16 of the side guide is stopped (S145).

Then, when the sensors S1, S2, and S4 of the work position detection unit 52 are turned on, the work is moved to the exit side guides 12-3, 12-4 and the guide plates 15-3, 15-4. After the grip (S146), and after a predetermined time (for example, 0.5 seconds) after the sensor (S5) is off, the rolling roll motor 14 is decelerated first (S147). Then, when the sensors S1 and S4 of the work position detection unit 52 are turned off and the detection load of the rolling motor 14 is 20% or less, the feed roll 11 and the rolling roll motor 14 are stopped. , The grips of the entrance and output side guides 12-1 to 12-4 and the guide plates 15-1 to 15-4 are released (opened). After completing this one-pass process, wait for two passes again.

The process as described above can be applied equally in each pass of the rolling process, that is, forward rolling or reverse rolling. For reverse rolling after the forward rolling, the secondary pass after the standby state is set in advance, and the pressing screw and The operation of the manifold is preceded.

Figure 13 is a state diagram for each step in the rolling process of the present invention.

Referring to FIG. 13, when the side guide 12 is moved to the material conveying part and the material is positioned between the entrance side guides 12-1 and 12-2 of the side guides 12, a carver to be rolled (usually Each side guide 12-1 to 12-4 are moved to the first carrier. The working distance of this side guide 12 is controlled by a conventional PLG (encoder) not shown in the figure. When the sensors BD HMD 02 and BD HMD 03 (S3 and S1) of the work position detecting unit 52 are detected, the plates 15-1 and 15-2 of the entrance side guides 12-1 and 12-2 are detected. The operation cylinder 28 is operated so that the grip roll 22 grips the side surface of the raw material (step 1).

On the other hand, the process of moving the material to the set carrier of the rolling roll 13, the side guides (12-1, 12-3) of one side line of the side guides of the entrance and exit side once, and then the entrance and exit side The side guides 12-2 and 12-4 on the other side of the side guides are reversed to secure a space where the material can be rotated 90 degrees, and in this state, the lifting fingers of the manipulator 17 After rotating the material by 90 degrees to match the center of the material and the carrier set through the manipulator 17, and then adjust the side guides at a predetermined interval (about 20mm) to smooth the progress of the material.

When the inlet grip of the material is completed in the above, next, in the outgoing grip process of the material using the outgoing guide plate, when the feed roll 11 (Roller Table) advances and blows the blower into the rolling roll 13, the rolling roll is When the sensor (BD HMD 04) (S2) of the material position detection unit 52 is rotated at the first set speed (eg, 0.8 m / sec), the distance to be gripped by the following Equation 1 (S1-450mm) Calculate the appropriate time T1, and check the detection state of the sensor (BD HMD 03) (S1) of the work position detection unit 52 at the time when the calculation is completed, and wait until it is detected. When the detection is confirmed, the working cylinders 28 of the plates 15-1 and 15-2 of the inlet side guides 12-1 and 12-2 of the side guides 12 are operated to operate the rolling rolls 13. The entrance (front) grip roll 22 grips the raw material (step 2).

Where S1 is the travel distance and 0.3 is the speed constant of the settable material.

That is, in order to operate the grip roll 22 at the optimum axis during the injection of the fixed shaft 25 to fix the roll, and to measure the length of the material in the rolling process of the material, the operation time of the grip 22 in the forward rolling The operating time, that is, the operating time of approximately 300 mm after the rolling is calculated by Equation 1 to calculate. For example, when the working distance S1 is 450 mm, the appropriate time T1 is 1.0 second (0.3 m ÷ 0.3 m / sec). In the above Equation 2, "× 2:" corresponds to a case where the sensors are installed at the same position at the center of the roll.

Next, after the grip of the material using the guide plate as described above, in the gripping process of the exit material using the exit side guide, the grip roll 22 grips the sides of the material at the entrance and exit (front and rear) The rolling speed in the state is decelerated at the secondary setting speed (0.3 m / sec), and then the time required to move by the set value of the distance (S2-500mm) set by Equation 2, and the grip time of the exit side guide Calculate the appropriate time (T2) to calculate, and the calculated time (T2), and when the detection is confirmed by the sensor (BD-HMD 04 or BD-HMD 05) (S2 or S4) exit side guide 12 Is advanced to the material side to perform the material grip. Subsequently, a load relay LOAD RELAY for detecting the load of the motor 14 of the rolling roll 13 is operated to prepare the grip force (operation force of the shot pinch) to be adjusted (step 3).

Here, S2 is a traveling distance, and 0.8 (m / sec) is a speed constant of the workable material. For example, when the titration time T1 is 1 second and the travel distance S2 is 100 mm, the time T2 is 1.625 seconds (1 second + 0.625 seconds).

In the above-described grip process of the material, operating the sensor and the distance progressed by the equations 1 and 2 at the time of the grip at the same time means that when the sensor is installed, the scale generated on the surface of the heated boil during the rolling process of the material There is a possibility of malfunction at the time of the grip by sensing the sensor while peeling in the rolling process, or if only depending on the above equations 1 and 2, there is a problem that the rolling does not progress by the instantaneous overload during the rolling process of the material. In this case, regardless of the state in which the material is stably blown into the rolling roll, the grip is performed only when the calculated time is obtained, which also causes a problem of failing to grip at the optimum time. Therefore, in the present invention, by controlling the grip of the raw material based on the load of the rolling roll 13 simultaneously with the time calculated by the above equations (1) and (2), more stable grip control is possible.

As described above, when the shot pinch (material grip) is completed, it is increased and rolled at a third rolling speed (2.0 m / sec), from which the shot pinch pressure of the side guide 12 is controlled according to the increase and decrease of the torque ( Step 4) Here, if the torque is set too low in the process of controlling the grip of the material in accordance with the increase of the torque, the load relay malfunctions due to the irregular operation of the torque during rolling, and automatic operation is impossible. In addition, when the torque is set too high, the load relay does not operate during the normal rolling of the material, thereby causing a problem of not being controlled at the secondary setting speed.

For this reason, the rolling reduction for each rolling pass is an important factor for smooth rolling of the raw material and proper grip of the raw material. For example, in the case where the amount of reduction is too small, the load relay operation fails when rolling below the set torque. Therefore, the rolling amount equal distribution and torque setting value for each pass are very important. In order to compensate for this, even if the load relay is operated before the rolling pass is completed by using the sensor installed on the rolling roll entrance and exit side (front and rear), the sensor before and after the rolling mill judges the completion of the pass. It can be regarded as operation.

The value set in consideration of the influence of the torque is appropriate to control the 20% to 30%, the present invention will be described by setting the set value to 20%. The action of the short pinch is that if the torque change exceeds 20% in the above-described process, the load relay is turned on and the side guide 12 pinches the material at a constant pressure. Pinch) and suppresses the buckling phenomenon of the rolled bloom. When this operation is completed, the grip roll 22 operated by the cylinder 28 suppresses the buckling phenomenon at the inlet and outlet of the rolling roll 13, and the front and rear side guides 12 are rolled. By pinching a predetermined portion of the pin, the grip roll 22 and the side guide 12 interlock to suppress the buckling phenomenon.

When the grip roll 22 and the side guide 12 are completed, the rolling roll 13 is increased at a set speed (2.0 m / sec), and in this process, the drive motor 16 of the side guide 12 is The voltage is continuously applied in the forward direction to increase the current. If the DC motor of the DC motor 16 detects the feedback current and exceeds the set current, the drive voltage is lowered and supplied again, and the feedback current is lower than the set value. When the voltage is increased again, the control of the set value is repeated continuously so that the rolling is performed while maintaining a constant pinch pressure. At this time, the strength of the short pinch pressure can be adjusted as the current set value. The set value may be different depending on the state of the control device and the state of the motor 16, but the percentage of the rated current can be set to 80% to 100% of the rated value to reduce the overload and expect sufficient pinch pressure.

During the rolling operation, the rolling operation is continued while adjusting the pressure of the side guide 12 during the rolling operation, and after the rod relay operation, the rear end of the broom is turned off at the sensor HMD_A01 in front of the rolling roll 13 and the set time After (0.5 sec), the motor decelerates (1.2m / sec) to the 1st stop setting deceleration speed (1.2m / sec), and the current decreases, and the torque decreases together. At this time, the torque change and the sensor in front of the rolling mill (HMD_ # When both 2 and # 3 are off, the rolling roll 13 is stopped and the guide rolls 15-1 to 15 are stopped by confirming that the material is completely passed from the entrance (front) to the exit (rear) and the rolling is completed. -4) is open while the cylinder 28 is operating.

Through this process, when the rolling operation in the forward direction is completed, the operation of the short pinch of the side guide 12 is canceled to move backward so that the material can be smoothly moved (step 5).

The process of step 2 to step 5 described above is performed again in the reverse direction to finish rolling in Carrier No. 2, and the process of continuously rolling the No. 3 or No. 4 repeatedly is repeated and the next step is completed. It is transferred to a (rolling rolling) and enters the rolling wait state of the next brom.

According to the present invention as described above, by controlling the grip of the side of the material with the side guide at the time when the bloom is blown into the rolling roll, and also by controlling the force of the grip, the occurrence of buckling early Can be prevented, and the occurrence of surface defects appearing on the surface of the material can be suppressed, thereby improving the quality of the material.

In other words, by operating the side guide 12 and the grip of the grip 22 to prevent the poor blown by the deformation generated in the top and the bottom of the material generated during the rolling process to improve the material error rate By reducing the production cost and preventing the wear of the flange portion of the rolling roll 13 to extend the life of the roll 13 and to prevent the contact between the material and the flange portion of the roll 13 and the edge of the material by overlapping the material and Prevents scratches and improves the quality of the material; By controlling the material buckling, it is possible to improve the rolling speed, improve productivity, and prevent the buckling phenomenon occurring during the rolling process, thereby preventing the rolling miss of the material, thereby reducing the production cost.

The above description is only a description of specific embodiments of the present invention, and the present invention is not limited to these specific embodiments, and various changes and modifications of the configuration are possible from the above-described specific embodiments of the present invention. It will be apparent to those skilled in the art to which the present invention pertains.

Claims (7)

In the device for controlling the grip of the raw material rolled by the rolling roll 13 driven by the motor 14, A rolling roll motor load detection unit 51 for detecting a load of the rolling roll 13 motor 14; A material position detection unit 52 including a plurality of sensors for detecting a rolling start and a rolling completion position of the material on both input and output sides of the rolling roll 13; A grip time calculation unit 53 for calculating a grip time of the workpiece based on the traveling distance and the traveling speed of the workpiece set by the workpiece position detection unit 52 from the starting point of rolling start of the workpiece; If the detection load by the rolling roll motor load detection unit 51 is greater than or equal to the set load after the rolling start detection of the raw material by the raw material position detecting unit 52, the grip of the raw material is controlled by the entry side guide, and the grip time calculating unit ( When the grip time of the raw material by 53) is reached, the grip of the raw material is controlled using the exit side guide 12, and the grip of the raw material when the detection load by the rolling roll motor load detection unit 51 is less than or equal to the set load. A material grip controller 54 for releasing the pressure; And The material conveyed by the conveying roll 11 for conveying the material is guided from both sides to the set caliber of the rolling roll 13, and is operated by the control of the material grip controller 54, and the material-side constant portion Side guides 12 including anti-friction rolls 29 mounted on Grip control device for the material to prevent torsion, characterized in that it comprises a. According to claim 1, wherein the side guide control device The rolling roll 13 side is provided to move toward the material at the end of the side guide 12, and further comprises a guide plate 15 for grip and release the material under the control of the material grip control unit 54 and, The grip time calculation unit 53 is the first grip time (T1) and the second grip time of the material on the basis of the travel distance and the traveling speed of the material set from the starting point of the starting rolling of the material by the material position detection unit 52 Calculates (T2), The material grip control unit 54 When the material is detected by the material detection sensor installed at the entrance of the rolling roll, the material is gripped by using the entrance guide plate, When the detection load by the rolling roll motor load detection unit 51 installed to detect the load of the rolling roll motor 14 corresponds to the rolling roll entry load, the raw material is gripped using the inlet side guide, The first grip time T1 of the material is calculated at the time of the material detection by the material detection sensor installed at the entrance side of the rolling roll, and when the calculated grip time of the material is reached, the material is gripped using the exit guide plate. , The second grip time T2 of the material is calculated at the time of the material detection by the material detection sensor installed at the entrance side of the rolling roll, and when the calculated grip time of the material is reached, the material is gripped using the exit side guide. Grip control device for the material to prevent torsion, characterized in that made to. The method of claim 1, wherein the guide plate 15 Plate body 15a; A fastening hole 27 and a rotating shaft 26 for fastening the plate body 15a to the side guide 12 so as to be rotatable within a set range in a material-side direction; A cylinder (28) installed on the roll fixing shaft (25) installed in each of the side guide (12) and the plate body (15a) to operate the plate body (15a); A grip roll 22 installed at an end of the plate body 15a to reduce friction with the material; A bearing 24 fixed by the fixed shaft 25 and inserted into a center of the grip roll 22; And Cooling nozzle 23 for cooling the grip roll 22 Grip control device for the material to prevent torsion, comprising a. In the method for controlling the grip operation of the material through the side guide 12 provided on the entry and exit sides of the rolling roll 13 with respect to the raw material rolled by the rolling roll 13, Controlling the blowing of the raw material into the rolling rolls 13 by selecting a carrier of the rolling rolls 13 to blow the raw materials; When the detection load by the rolling roll motor load detection unit 51 is greater than or equal to the set load after the rolling start detection, which is the time point at which the raw material enters the previously selected carrier of the rolling roll 13, the entrance side of the raw material is entered by the side guide. Performing a grip; When a predetermined time elapses after the rolling start detection, performing outgoing grip of the material through the side guide 12 at the exit side of the rolling roll 13; And Releasing the grip of the material when the detection load by the rolling roll motor load detection unit 51 is less than or equal to the set load. Grips control method of the material for preventing the material twist, characterized in that consisting of. The method of claim 4, wherein the entering grip is performed. Performing grip of a material by using the entrance guide plate when the material is detected by the material detection sensor installed at the entrance side of the rolling roll; And When the detection load by the rolling roll motor load detection unit 51 installed to detect the load of the rolling roll motor 14 corresponds to the rolling roll entry load, performing grip of the material by using the inlet side guide. Grip control method of the material for preventing the material to twist, characterized in that it comprises a. The method of claim 4, wherein the exiting grip is performed. The first grip time T1 of the material is calculated at the time of the material detection by the material detection sensor installed at the entrance side of the rolling roll, and when the calculated grip time of the material is reached, the grip of the material is performed using the exit guide plate. Performing; And The second grip time T2 of the material is calculated at the time of the material detection by the material detection sensor installed at the entrance side of the rolling roll, and when the calculated grip time of the material is reached, the grip of the material is performed using the exit side guide. Steps to perform Grip control method of the material for preventing the material to twist, characterized in that it comprises a. The method of claim 4, wherein the entry and exit grips are performed. The load of the drive motor 16 of the side guide 12 is detected by advancing the side guide 12 to the material side, and the rolled material and the side guide 12 are brought into close contact with each other. The grip control method of the material for preventing the material twist to control the amount of load of the drive motor (16) according to the comparison difference while comparing the set load to apply an appropriate pressure between the material and the side guide (12).