JP2006007298A - Speed setting method in continuous rolling equipment - Google Patents

Abstract

A motor speed is reset according to a change in a passing cross-sectional area of a material to be rolled due to roll wear without measuring a passing cross-sectional area of the material to be rolled.
A reference passing cross-sectional area S1 and initial values J2 to J5 of first to fifth rolling mills R1 to R5 are set. Based on the reference cross-sectional area S1 and the initial values J2 to J5, the first to fifth rolling mills R1 to R5 are operated at motor speeds MV1 to MV5 so that the set mass flow SV0 is obtained. During rolling, the motor speeds MV1 to MV5 are adjusted so that the mass flow of the first to fifth rolling mills R1 to R5 is constant, and the reference mass flow SV1 of the first rolling mill R1 and the second to fifth rolling mills are adjusted each time. Find the instantaneous cross-sectional areas S2 to S5 of R2 to R5. The resetting of the motor speeds MV1 to MV5 of the rolling mills R1 to R5 is performed based on the cross-sectional area calculation values K2 to K5 obtained by averaging the instantaneous passage cross-sectional areas S2 to S5 and the reference passage cross-sectional area S1.
[Selection] Figure 1

Description

  The present invention relates to a cross-sectional area through which a material to be rolled passes, in which the motor speed of each rolling mill in a continuous rolling facility having a plurality of adjustable rolling mills and non-adjusting rolling mills capable of adjusting the roll interval changes according to roll wear. It is related with the speed setting method in the continuous rolling equipment which can be set appropriately corresponding to this.

Depending on the requirements of precision rolling for steel bars and wire rods, a two-way rolling machine with two rolling rolls facing each other across the pass line of the material to be rolled, and three rolling rolls arranged at 120 ° intervals around the pass line In addition, a continuous rolling facility is proposed that combines a three-way rolling mill that can obtain a higher rolling quality than the two-way rolling mill (see, for example, Patent Document 1). The two-way rolling mill is equipped with a roll reduction device that operates during rolling, and automatically adjusts the roll interval when the cross-sectional area of the roll hole mold (cariba) changes due to roll wear or the like, and passes the material to be rolled. It is configured as an adjustable rolling mill that can keep the cross-sectional area substantially constant. On the other hand, although a three-way rolling mill can obtain high rolling quality, its roll configuration is complicated, so there is no roll reduction device that operates during rolling, and the material of the material to be rolled accompanying roll wear is not provided. This is a non-adjustable rolling mill that cannot compensate for changes in the cross-sectional area.
Japanese Patent Laid-Open No. 5-317937

  In the continuous rolling equipment provided with the plurality of rolling mills, when rolling the material to be rolled, the mutual speed relationship between the rolling mills is constant according to the cross-sectional area of the material to be rolled that passes through each rolling mill. It is necessary to set the motor speed of each rolling mill. However, in a three-way rolling mill that does not automatically adjust the roll interval, the roll interval is not adjusted in accordance with roll wear. Therefore, when the rolling schedule is changed or the roll of another rolling mill is replaced, the 3 The cross sectional area of the roll hole type of the rolling mill, that is, the passing cross sectional area of the material to be rolled is unknown. Therefore, the motor speed cannot be reset based on the current cross-sectional area, and there is a possibility that good rolling may not be performed. Moreover, it is difficult to measure the cross-sectional area of the material to be rolled during rolling, and it is possible to reset the motor speed so that the speed relationship between the rolling mills is constant without measuring the cross-sectional area. Technology is needed.

  That is, the present invention has been proposed to solve this problem in view of the above-mentioned problems inherent in the prior art described above, and it is possible to wear the roll without measuring the cross-sectional area of the material to be rolled. An object of the present invention is to provide a speed setting method in a continuous rolling facility that can reset the motor speed so that the mutual speed relationship of the rolling mills becomes constant according to the change in the cross-sectional area of the material to be rolled accompanying .

In order to overcome the above-mentioned problem and achieve the desired purpose suitably, the speed setting method in the continuous rolling equipment according to the present invention,
In continuous rolling equipment in which a plurality of adjustable rolling mills and non-adjustable rolling mills that can adjust the roll interval along the pass line of the material to be rolled are arranged in series,
The rolling cross section of the material to be rolled passing through the reference device provided on the pass line and passing through the reference device having a constant cross sectional area when the material to be rolled passes is set as a reference passing cross sectional area, and each rolling mill Set the initial value of the cross-sectional area of the material to be rolled that passes through
Set the motor speed of each of the reference device and each rolling mill to be a set mass flow based on the reference passing cross-sectional area and the initial value, and roll the material to be rolled by operating at the speed,
During the rolling of the material to be rolled, the reference device and the motor speed of each rolling mill are adjusted so that the mass flow of the reference device and each rolling mill is constant, and each time the motor speed is adjusted, the reference device A reference mass flow is determined from the delivery side material speed of the material to be rolled passing through and the reference passage cross-sectional area, and at least the delivery side material speed of the material to be rolled that passes through each non-adjustable rolling mill based on a constant mass flow rule And from the reference mass flow, to determine the instantaneous passage cross-sectional area of the material to be rolled that passes through each non-adjustable rolling mill,
Perform the averaging process of the instantaneous cross-sectional area obtained every time the motor speed is adjusted, the value as the cross-sectional area calculation value,
When resetting the motor speed of each non-adjustable rolling mill, it is performed based on the cross-sectional area calculation value.

  According to the speed setting method in the continuous rolling equipment according to the present invention, since the cross-sectional area of the material to be rolled according to roll wear during rolling is obtained based on the constant mass flow rule, roll change, rolling schedule change, etc. In this case, the motor speed of the non-adjustable rolling mill can be reset based on the current cross-sectional area, and stable rolling can be achieved. Further, by using an adjustable rolling mill as a reference device, it is not necessary to provide a separate device, and an increase in cost can be suppressed.

  Next, the speed setting method in the continuous rolling equipment according to the present invention will be described below with reference to the accompanying drawings by giving a preferred embodiment.

  FIG. 1 shows a schematic configuration of a continuous rolling facility according to an embodiment. The continuous rolling facility 10 includes two rolling rolls 14 and 14 facing each other across a pass line PL of a material 12 to be rolled. A plurality of two-way rolling mills R1 and R5 provided for rotation, and a plurality of three-way rolling machines provided with three rolling rolls 16, 16, and 16 arranged at intervals of 120 ° about the pass line PL. The machines R2, R3, R4 are arranged in series along the pass line PL. In the embodiment, the two-way rolling mills R1 and R5 are respectively disposed on the most upstream side and the most downstream side in the feeding direction of the material to be rolled 12, and three three-way rolling mills R2, R3, and R4 are interposed therebetween. Although it is arranged, the number of rolling mills is not limited to the embodiment, and can be set according to various specifications.

  The two-way rolling mills R1 and R5 are provided with a roll reduction device (not shown) that operates during rolling, and when the cross-sectional area of the roll hole mold changes due to roll wear or the like, the roll interval is adjusted to This is an adjustable rolling mill that can keep the passage cross-sectional area of the rolling material 12 substantially constant, and the three-way rolling mills R2, R3, and R4 are non-adjustable rolling machines that are not provided with a roll reduction device that operates during rolling. Machine. In the examples, the two-way rolling mill on the most upstream side is designated as the first rolling mill R1, and the second rolling mill R2, the third rolling mill R3, the fourth rolling mill R4, and the fifth rolling mill R5 are sequentially downstream. Will be referred to.

  The rolling rolls 14, 14 or the rolling rolls 16, 16, 16 of each of the rolling mills R1-R5 are driven to rotate in a predetermined direction by driving motors M1-M5 via reduction gears RG1-RG5. Speed detectors PG1 to PG5 are connected to the drive motors M1 to M5, and speed controllers ASR1 to ASR5 are connected via motor drive circuits MC1 to MC5. And according to the instruction | command from tension controller TC1-TC5 which controls the tension | tensile_strength between each adjacent rolling mill, speed controller ASR1-ASR5 automatically adjusts speed MV1-MV5 of drive motor M1-M5, and each rolling mill The tension between them is always controlled to be constant. Then, by keeping the tension between the rolling mills constant in this way, the mass flow (the mass of the material to be rolled that passes through the rolling mill per unit time) in each of the rolling mills R1 to R5 becomes constant. That is, in the continuous rolling equipment 10 of the embodiment, the motor speeds MV1 to MV5 of the drive motors M1 to M5 are adjusted so that the mass flow in each of the rolling mills R1 to R5 is constant. . The tension controllers TC1 to TC5 are configured so that the motor speed MV1 of the drive motors M1 to M5 is adjusted so that the rolling mill tension (actually measured value) measured by a tension measuring unit (not shown) becomes a preset target value. ~ MV5 is set to be adjusted. The rolling mill tension may not be actually measured but may be calculated from other known data.

  The first rolling mill R1 includes a reference mass flow calculation unit 18 that calculates a reference mass flow SV1. Incidentally, the mass flow is expressed by the equation of mass flow = outgoing material speed × passage cross-sectional area. In this reference mass flow calculation unit 18, the output of the first rolling mill R1 is determined from the mechanical constant N1 obtained from the effective roll diameter D1 and the reduction ratio I1 of the rolling roll 14 and the motor shaft angular velocity ω1 detected by the speed detector PG1. The side material speed V1 is calculated. The first rolling mill R1 is set as a reference device because the passage cross-sectional area of the material to be rolled 12 is always constant by the roll reduction device, and the first rolling mill R1 of the material to be rolled 12 in the first rolling mill R1 is set. The passage sectional area is set as the reference passage sectional area S1. The reference mass flow calculation unit 18 is set so as to obtain the reference mass flow SV1 from the calculated delivery material speed V1 and the reference passage cross-sectional area S1. The reference passage cross-sectional area S1 is obtained in advance from a cross-sectional area of a known roll hole type set in the rolling rolls 14 and 14 in a new state or a state of cutting (before roll wear is caused by rolling). .

  Said 2nd-5th rolling mill R2-R5 is each equipped with the cross-sectional area calculating part 20,22,24,26 of the to-be-rolled material 12 of the same structure. The passage cross-sectional area calculation units 20 to 26 are detected by mechanical constants N2 to N5 obtained from effective roll diameters D2 to D5 and reduction ratios I2 to I5 of the corresponding rolling rolls 14 and 16, and the speed detectors PG2 to PG5. From the motor shaft angular velocities ω2 to ω5, the outlet side material velocities V2 to V5 of the corresponding rolling mills R2 to R5 are calculated. Here, according to the mass flow constant law, the mass flow in each of the rolling mills R1 to R5 is the same, so the mass flow of the second to fifth rolling mills R2 to R5 is the first rolling mill R1 obtained by the reference massflow calculation unit 18. This is the same as the reference mass flow SV1. Therefore, in the passage cross-sectional area calculation units 20 to 26, the instantaneous passage interruption in which the material to be rolled 12 passes through the corresponding rolling mills R2 to R5 from the calculated delivery-side material speeds V2 to V5 and the reference mass flow SV1. The area (instantaneous passage cross-sectional area) S2 to S5 is set to be obtained. That is, the instantaneous passage cross-sectional areas S2 to S5 are obtained by the equation: instantaneous cross-sectional areas S2 to S5 = reference mass flow SV1 / exit-side material speed V2 to V5.

  The reference mass flow calculation unit 18 and the passage cross-sectional area calculation units 20 to 26 each time the motor speeds MV1 to MV5 of the drive motors M1 to M5 are adjusted (changed) by the corresponding tension controllers TC1 to TC5. The mass flow SV1 and the instantaneous passage cross sections S2 to S5 are determined. Moreover, in the passage cross-sectional area calculation units 20 to 26, the cross-sectional area is obtained by averaging the instantaneous cross-sectional areas S2 to S5 obtained every time the motor speeds MV1 to MV5 of the drive motors M1 to M5 are adjusted. The calculation values K2 to K5 are stored.

  In the passing cross-sectional area calculation units 20 to 26, when the material to be rolled 12 is first rolled by the new roll rolls 14 and 16, the known roll rolls 14 and 16 are known. The passing cross-sectional area of the material to be rolled 12 determined from the cross-sectional area of the roll hole mold is configured to be set as initial values J2 to J5.

(Effects of Example)
Next, the operation of the speed setting method in the continuous rolling facility according to the above-described embodiment will be described.

  When rolling the material 12 to be rolled by the continuous rolling equipment 10 equipped with first to fifth rolling mills R1 to R5 incorporating new or modified new rolling rolls 14 and 16, first, in the first rolling mill R1. Based on the reference passage sectional area S1 obtained from the sectional area of the roll hole mold set for the new rolling rolls 14 and 14, and the target set mass flow SV0 set by the higher control means, the set mass flow SV0 is set. The motor speed MV1 of the first rolling mill R1 is set so that In the second to fifth rolling mills R2 to R5, the sectional area of the roll hole mold of the new rolling rolls 14, 14 or the rolling rolls 16, 16, 16 is a known value as in the case of the first rolling mill R1. Therefore, the passage cross-sectional area of the material to be rolled 12 obtained by calculation from the cross-sectional area is set as an initial value J2 to J5, and based on the initial value J2 to J5 and the set mass flow SV0, the set mass flow SV0 is obtained. Thus, the motor speeds MV2 to MV5 of the second to fifth rolling mills R2 to R5 are set, respectively.

  When the operation of the continuous rolling facility 10 is started, the drive motors M1 to M5 are rotationally driven so as to have the motor speeds MV1 to MV5 obtained as described above, and the rolling of the material 12 to be rolled is started. When the rolling rolls 14 and 16 are worn during rolling, the passing cross-sectional area of the material to be rolled 12 and the roll peripheral speed change, and accordingly, the tension between the rolling mills fluctuates and stable rolling cannot be performed. That is, since the outlet side material speeds V1 to V5 in the rolling mills R1 to R5 change with the change of the roll peripheral speed, the mass flow in the rolling mills R1 to R5 is not kept constant. Therefore, in the continuous rolling equipment 10 of the embodiment, during the rolling of the material 12 to be rolled, each of the tension controllers TC1 to TC5 is preset with an actual value of the rolling mill tension measured by the tension measuring means. The speeds MV1 to MV5 of the corresponding drive motors M1 to M5 are feedback-controlled so as to be the same as the target value. That is, in the continuous rolling facility 10, the motor speeds MV1 to MV5 are adjusted so that the mass flow of the rolling mills R1 to R5 is constant, and stable rolling is performed.

  When the speed adjustment of the drive motors M1 to M5 is performed by the tension controllers TC1 to TC5, the reference mass flow calculation unit 18 of the first rolling mill R1 obtains the effective roll diameter D1 and the reduction ratio I1 of the rolling roll 14. The delivery material speed V1 after adjustment of the first rolling mill R1 is calculated from the machine constant N1 and the motor shaft angular speed ω1 detected by the speed detector PG1. Moreover, in the 1st rolling mill R1 as a reference | standard apparatus, since it is comprised so that the passage cross-sectional area of the to-be-rolled material 12 may become always constant with a roll reduction apparatus according to roll wear as mentioned above, the rolling rolls 14, 14 is worn, the current cross-sectional area of the material 12 to be rolled is the same as the reference cross-sectional area S1, and the reference mass flow SV1 is calculated from the reference cross-sectional area S1 and the calculated exit side material velocity V1. Is required.

  On the other hand, in each passage cross-sectional area calculating part 20-26 of the said 2nd-5th rolling mill R2-R5, it obtains from the effective roll diameter D2-D5 and reduction ratio I2-I5 of a corresponding rolling roll 14,16. From the machine constants N2 to N5 and the motor shaft angular speeds ω2 to ω5 detected by the speed detectors PG2 to PG5, the adjusted delivery material speeds V2 to V5 of the corresponding rolling mills R2 to R5 are calculated. Then, based on the mass flow constant law, the instantaneous passage cross-sectional areas S2 to S5 are obtained from the calculated delivery material speeds V2 to V5 and the reference mass flow SV1. That is, the instantaneous passing cross-sectional areas S2 to S4 in the rolling mills R2 to R4 not provided with the roll reduction device correspond to the passing cross-sectional areas of the material to be rolled 12 changed from the initial values J2 to J4 due to roll wear.

  During the rolling of the material to be rolled 12, every time the motor speeds V1 to V5 of the drive motors M1 to M5 are adjusted by the tension controllers TC1 to TC5, the reference mass flow SV1 and the instantaneous passage sectional areas S2 to S5 are adjusted. As for the instantaneous cross-sectional areas S2 to S5, these values are averaged and stored in the cross-sectional area calculation units 20 to 26 as the cross-sectional area calculation values K2 to K5, respectively. These cross-sectional area calculated values K2 to K5 are values reflecting roll wear, and in the rolling mills R2 to R4 that are not equipped with a roll reduction device such as a three-way rolling mill, the current passage of the material 12 to be rolled is cut off. It is equivalent to the area.

  Next, the motor speeds V1 to V5 of the respective rolling mills R1 to R5 are changed by replacing any of the rolling rolls 14 and 16 among the first to fifth rolling mills R1 to R5, or by changing the rolling schedule. In the case of resetting, motor speeds V1 to V5 are set from the set mass flow SV0 or the newly set mass flow, the reference passage sectional area S1, and the sectional area calculation values K2 to K5. That is, even in a three-way rolling mill (second to fourth rolling mills R2 to R4) that does not perform roll reduction adjustment according to roll wear, the current cross-sectional area of the material to be rolled 12 (cross-sectional area calculation value K2 to K2). Since K4) is known, when the motor speeds V1 to V5 are reset, the speed control of each of the rolling mills R1 to R5 is simply performed so that the mutual speed relationship of the rolling mills R1 to R5 is constant. It can be performed and stable rolling can always be performed. Further, based on the mass flow constant law, the current material to be rolled 12 passes through the reference mass flow SV1 of the first rolling mill R1 serving as a reference and passes through the second to fourth rolling mills R2 to R4 that are non-adjustable rolling mills. Since the cross-sectional area is obtained, the passing cross-sectional area of the material 12 to be rolled during rolling need not be measured.

  In addition, when the roll diameter itself of the rolling rolls 14 and 16 is changed, the motor speeds V1 to V5 are set based on the new reference passage sectional area S1 and the initial values J2 to J5 obtained as described above.

[Example of change]
The present application is not limited to the configuration of the above-described embodiment, and the system exemplified below and various other configurations can be appropriately employed.

  In the examples, the most upstream two-way rolling mill (first rolling mill R1) was adopted as the reference device, but the most downstream two-way rolling mill (fifth rolling mill R5) or disposed on the pass line. It is sufficient that the cross-sectional area through which the material to be rolled passes does not change during rolling, such as a pinch roll. In the embodiment, the calculated value of the cross-sectional area is obtained also in the fifth rolling mill (two-way rolling mill) on the most downstream side. However, since the rolling mill is an adjustable rolling mill, roll wear occurs. However, the passage cross-sectional area of the material to be rolled is the same as the initial value, and it is possible to omit the passage cross-sectional area calculation unit and provide a calculation unit similar to the reference mass flow calculation unit. That is, during rolling, at least the calculated cross-sectional area values of the non-adjustable rolling mills (second to fourth rolling mills R2 to R4) are obtained, and the non-adjustable rolling mills (second to fourth rolling mills) are calculated from the calculated cross-sectional area values. What is necessary is just to reset the motor speed of machine R2-R4).

  In the embodiment, the motor speed is automatically adjusted by the tension controller so as to keep the tension between the rolling mills constant, but the speed is adjusted by the loop controller that controls the amount of sag of the material to be rolled between the rolling mills. It may be what you do. That is, various other known means can be adopted as long as it can automatically adjust the speed of each rolling mill so that stable rolling can be performed so that the mass flow of each rolling mill is constant.

It is a schematic block diagram of the continuous rolling equipment which concerns on an Example.

Explanation of symbols

12 Material to be rolled, PL pass line, R1 1st rolling mill (reference device), R2 2nd rolling mill R3 3rd rolling mill, R4 4th rolling mill, R5 5th rolling mill, S1 reference passage cross section SV0 set mass flow , SV1 Standard mass flow, J2 to J5 initial value MV1 to MV5 Motor speed, V1 to V5 Outlet material speed S2 to S4 Instantaneous passage cross section, K2 to K4 cross section area calculation value

Claims (2)

A plurality of adjustable rolling mills (R1, R5) and non-adjustable rolling mills (R2, R3, R4) that can adjust the roll interval along the pass line (PL) of the material to be rolled (12) are arranged in series. In continuous rolling equipment,
Based on the cross-sectional area of the material to be rolled (12) passing through the reference device (R1) provided on the pass line (PL) and having a constant cross-sectional area when the material to be rolled (12) passes. Set as the passing cross-sectional area (S1), and set the initial value (J2-J5) of the cross-sectional area of the material to be rolled (12) that passes through each rolling mill (R2 ~ R5),
Motor speeds (MV1 to MV5) of the reference device (R1) and the rolling mills (R2 to R5) to be set mass flow (SV0) based on the reference passage cross-sectional area (S1) and initial values (J2 to J5) ), Respectively, to roll the material to be rolled (12) by operating at the speed (MV1 ~ MV5),
During rolling of the material to be rolled (12), the reference device (R1) and each rolling mill (R2 to R5) of the reference device (R1) and each rolling mill (R2 to R5) so that the mass flow is constant. Each time the motor speed (MV1 to MV5) is adjusted and the motor speed (MV1 to MV5) is adjusted, the material speed (V1) of the material to be rolled (12) passing through the reference device (R1) and Obtaining the reference mass flow (SV1) from the reference passage cross-sectional area (S1) and, based on the mass flow constant law, at least the exit side of the material to be rolled (12) passing through each of the non-adjustable rolling mills (R2 to R4) From the material speed (V2 to V4) and the reference mass flow (SV1), obtain the instantaneous cross-sectional area (S2 to S4) of the material to be rolled (12) that passes through each non-adjustable rolling mill (R2 to R4),
Perform the averaging process of the instantaneous passage cross-sectional area (S2 ~ S4) obtained each time the motor speed (MV2 ~ MV4) is adjusted, the value is the cross-sectional area calculation value (K2 ~ K4),
When resetting the motor speed (MV2 to MV4) of each of the non-adjustable rolling mills (R2 to R4), it is performed based on the cross-sectional area calculation values (K2 to K4). Speed setting method in continuous rolling equipment. The speed setting method in a continuous rolling facility according to claim 1, wherein the reference device is the adjustable rolling mill (R1).

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