JP2005186085A - Thickness change controller for travelling plate in continuous cold rolling machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thickness change controller for a travelling plate, which corrects a setting error of a roll gap due to an error of a deformation resistance value calculated by a computer, and suppresses an off-gauge failure of a plate thickness at a thickness changing position of the travelling plate. <P>SOLUTION: The thickness change controller for the travelling plate in the continuous cold rolling machine controls respective roll gaps and rolling speeds of a plurality of rolling stands provided in the machine to the setting values of the roll gaps and the rolling speeds calculated by inputting. The controller is provided with: plate thickness measuring means 8 and 9 to detect plate thicknesses on inlet and outlet sides of the upstream rolling stands; a rolling load measuring means 11 to measure rolling loads on the upstream rolling stands; a setting value correcting means 12 to work out a correction amount to correct calculation error with respect to the deformation resistance in the setting values of the roll gaps calculated based on the obtained plate thicknesses and rolling loads; and a thickness change controlling means 3 for the travelling plate to correct the setting values of the roll gaps of the downstream rolling stands according to the correction amount, and to control the roll gaps and the rolling speeds of the respective rolling stands. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a running thickness change control device for a cold continuous rolling mill in a rolling line.

  In a cold continuous rolling mill having a plurality of rolling stands, the dimensions of the material to be rolled transmitted from the production management computer, etc. are used in order to carry out continuous rolling by rolling the rolled material having different specifications before rolling. There is a running thickness change control device for calculating set values of the roll gap and roll speed of each stand in the process computer based on the information, and controlling to the set values.

  However, the computer information used for calculating the setting values of the roll gap and the roll speed does not always match the actual information. Especially for the base metal thickness, there is a case where the gap between the control information is large because the position of changing the thickness of the running plate hits the tip or tail of the hot-rolled product and the welded part. If the running plate thickness is changed under certain conditions, there will be a difference between the conditions assumed in the set value calculation and the actual rolling conditions, so even if the roll gap and roll speed are controlled as set values, This will cause off-gauge defects in the plate thickness near the plate thickness change position.

  In addition, the advanced rate calculated based on the model formula in the calculation of the roll speed setting value includes a calculation error (error from the actual value included in the value obtained by the calculation). Even if the roll speed is controlled according to the set value with the control device, the speed of the material to be rolled on the stand exit side does not reach the target value. This results in an off-gauge defect in the plate thickness in the vicinity of the intermediate plate thickness change position.

  Conventionally, as a measure for solving such a problem, there is a method of measuring the base metal plate thickness at the optimum position before and after the running plate thickness change position, and correcting the roll gap setting value based on the measured value ( For example, see Patent Document 1).

Japanese Patent Laid-Open No. 11-226619

  However, in the conventional apparatus, when performing the calculation to correct the error of the roll gap setting value due to the error of the base metal plate thickness, the calculation error of the deformation resistance calculated based on the model formula in the process computer is taken into account. Therefore, even after correction, the roll gap setting value still contains an error. Further, since there is no means for correcting the error of the roll speed setting value due to the calculation error of the advance rate, there is a problem that the effect of suppressing off-gauge defects is not great.

  The present invention has been made to solve the above-described problems, and corrects a roll gap setting error due to an error of a deformation resistance calculation value in a process computer or a roll speed setting error due to an error of an advanced rate calculation value. It is an object of the present invention to provide a running thickness change control device that can suppress off-gauge defects in the thickness at the running thickness change position and improve product thickness accuracy and yield. .

  In the cold continuous rolling mill having a plurality of rolling stands, the present invention controls the roll gap and roll speed of each rolling stand to the set values of the roll gap and roll speed of each stand obtained by the input calculation. Rolling thickness measuring means for determining the thickness at the entrance side and the exit side of the upstream rolling stand, and rolling for measuring the rolling load of the upstream rolling stand. A load measuring means, and a set value correcting means for calculating a correction amount for correcting a calculation error related to the deformation resistance of the roll gap set value obtained by the calculation based on the obtained plate thickness and the measured rolling load; Based on the correction amount, the roll gap setting value of the downstream rolling stand is corrected to control the roll gap and the roll speed of each rolling stand. Lying in-fly thickness change controller cold continuous rolling mill, characterized in comprising a Hashimaban thickness change control means.

  The calculation error of deformation resistance is identified based on the measured value of the thickness gauge installed on the entrance side and the exit side of the upstream stand and the measured value of the rolling load measuring instrument, and the roll gap setting value of the downstream stand is based on the result. It is possible to correct the roll gap setting error caused by the error of the deformation resistance calculation value in the process computer, and to suppress the off-gauge defect of the plate thickness near the running plate thickness change position. The plate thickness accuracy and yield can be improved.

Embodiment 1 FIG.
FIG. 1 shows a configuration of a control device for a cold continuous rolling mill including a running plate thickness change control device according to an embodiment of the present invention. In FIG. 1, a production management computer 1 manages specifications such as dimensions of a material to be rolled. The process computer 2 calculates set values necessary for rolling. The running plate thickness change control unit 3 performs error correction described below on the set values of the roll gap and the roll speed calculated by the process computer 2 to perform change control of the running plate thickness. The rolling stand 4 is constituted by upper and lower rolls R. The reduction cylinder 5 adjusts the roll gap of the rolling stand 4. The motor 6 rotates the rolling stand 4. The preceding material 7 is a preceding part in the change of the running plate thickness, and the succeeding material 8 is a subsequent part.

  The thickness gauge 9 is installed on the entrance side of the upstream stand (the rolling stand on the right side of the figure), and the thickness gauge 10 is installed on the exit side of the upstream stand to measure the thickness of the material to be rolled. The rolling load measuring device 11 measures the rolling load applied to the rolling stand 4. The set value correction unit 12 calculates a correction amount of the roll gap set value based on the measurement values of the plate thickness gauges 9 and 10 and the rolling load measuring instrument 11 and sends the calculated amount to the running plate thickness change control unit 3.

  Next, the operation will be described. In FIG. 1, basically, the production management computer 1 instructs the process computer 2 on rolling specifications such as the base material plate thickness, product (finished) plate thickness, and plate width such as the plate width. Based on the contents of this instruction, the process computer 2 determines the plate thickness target value and tension setting value at each rolling stand 4 and calculates deformation resistance, friction coefficient, rolling load, advanced rate, and changes the running plate thickness. The setting values of the roll gap and the roll speed of each stand 4 for performing the above are obtained.

  The set values of the roll gap and the roll speed determined by the process computer 2 are transmitted in advance to the running plate thickness change control unit 3 before starting the running plate thickness change. The running plate thickness change control unit 3 performs control for changing the set values of the roll gap and the roll speed from the preceding material 7 to the succeeding material 8 while tracking the running plate thickness change position.

  Tracking of the thickness change position in the thickness change control unit 3 is actually performed on the material to be rolled as specifications such as the dimensions of the material to be rolled via the production management computer 1 and the process computer 2, for example. Information on the inter-plate thickness change position is sent, and based on this information, the inter-plate thickness change position is obtained at any time by calculation from the roll speed, advanced rate, and the like. Further, for example, a marker such as a hole is provided at the running thickness change position of the material to be rolled, and this is detected by a sensor (not shown) and the running thickness change position is corrected based on signals from these markers. Sometimes it is done.

  When the running plate thickness change control unit 3 performs tracking and detects that the running plate thickness change position in the preceding material 7 and the following material 8 has passed through the upstream stand (the rolling stand 4 at the right end in the figure), The plate thickness on the inlet side of the upstream stand is measured by the plate thickness meter 9 and the plate thickness on the outlet side is measured by the plate thickness meter 10 and output to the set value correction unit 12. Further, the rolling load applied to the upstream stand is measured by the rolling load measuring instrument 11 and output to the set value correction unit 12.

  The set value correction unit 12 transmits in advance the influence coefficient that the change in the inlet side thickness has on the rolling load and the influence coefficient that the change in the outlet side thickness has on the rolling load, which are calculated by the process computer 2 (calculated). Each set value and mill constant etc. are also transmitted in the same manner. The same applies hereinafter), the calculation error of deformation resistance is identified by the following formula (1) before the change of the running plate thickness of the downstream stand, and the downstream stand by formula (2) Calculate the roll gap correction amount.

  The set value correction unit 12 transmits the calculation result of the roll gap correction amount according to the equation (2) to the running plate thickness change control unit 3, and the roll that is transmitted in advance from the process computer 2 in the running plate thickness change control unit 3. In addition to the gap setting value, the roll gap setting value is changed from the preceding material 7 to the succeeding material 8 at the downstream stand while tracking the running thickness change position.

  As described above, the calculation error of deformation resistance is identified based on the measured value of the thickness gauge installed on the entrance side and the exit side of the upstream stand and the measured value of the rolling load measuring instrument, and the downstream stand is based on the result. By correcting and controlling the roll gap setting value, it becomes possible to correct the roll gap setting error due to the error of the deformation resistance calculation value in the process computer 2, and the plate thickness off-gauge failure in the vicinity of the running thickness change position It is possible to improve the thickness accuracy and yield of the product by suppressing the above.

Embodiment 2. FIG.
FIG. 2 shows a configuration of a control device for a cold continuous rolling mill including a running thickness change control device according to another embodiment of the present invention. In FIG. 2, the same or corresponding parts as those in the above embodiment are indicated by the same reference numerals. The gauge meter plate thickness calculation unit 13 calculates the plate thickness on the outlet side of the upstream stand by a known gauge meter type using the roll gap measurement value by the rolling cylinder 5 and the rolling load measurement value by the rolling load measuring device 11. .

  Next, the operation will be described. In FIG. 2, tracking of the running plate thickness change position, measurement of the inlet side plate thickness and rolling load of the upstream stand, calculation method in the set value correction unit 12, and control method in the running plate thickness change control unit 3 are implemented. It is the same as that of the form 1 of.

  The gauge meter plate thickness calculation unit 13 uses the roll gap measurement value by the reduction cylinder 5 in the upstream stand and the rolling load measurement value by the rolling load measuring instrument 11, and uses the following formula (3) to calculate the value at the upstream stand exit side. Calculate the thickness deviation. Each set value, mill constant, etc. are transmitted from the process computer 2 (the same applies hereinafter).

  The gauge meter plate thickness calculation unit 13 outputs the calculation result to the set value correction unit 12 and applies it to the above equation (2) instead of the measured value of the outlet side plate thickness deviation in the first embodiment.

  As described above, even when a thickness gauge is not installed on the outlet side of the upstream stand, the outlet side thickness is calculated from the roll gap and the rolling load measured by the rolling cylinder 5 and the rolling load measuring instrument 11 of the upstream stand, respectively. Therefore, by using this, it is possible to improve the product thickness accuracy and yield as in the first embodiment.

Embodiment 3 FIG.
FIG. 3 shows a configuration of a control device for a cold continuous rolling mill including a running thickness change control device according to still another embodiment of the present invention. In FIG. 3, the same or corresponding parts as those in the above embodiment are indicated by the same reference numerals. The plate thickness meter 14 measures the entry side plate thickness in the downstream stand that is the correction target of the roll gap set value.

  Next, the operation will be described. In FIG. 3, the tracking plate thickness change position tracking, the calculation method of the deformation resistance calculation error in the upstream stand, and the control method in the cross plate thickness change control unit 3 are the same as those in the first embodiment.

  In the set value correction unit 12, when calculating the roll gap set value correction amount of the downstream stand using the deformation resistance calculation error obtained by the above equation (2), the downstream side entrance side plate thickness assumed in the setting calculation is calculated. Since there is an error in the actual entry side plate thickness, in order to eliminate this error, it is detected by tracking that the running thickness change position has passed the plate thickness meter 14 installed on the entry side of the downstream stand. The correction value is calculated by the following equation (4) using the measured value at the running thickness change position (Each influence coefficient, setting value and mill constant are obtained from the process computer 2 as in the above embodiment). .

  The set value correction unit 12 transmits the calculation result of the roll gap correction amount according to the equation (4) to the running plate thickness change control unit 3, and the roll transmitted in advance from the process computer 2 in the running plate thickness change control unit 3. In addition to the gap setting value, the roll gap setting value is changed from the preceding material 7 to the succeeding material 8 at the downstream stand while tracking the running thickness change position.

  As described above, roll gap setting accuracy is improved by measuring the thickness of the plate thickness change position on the entry side of the downstream stand and reflecting the measured value in the calculation of the roll gap correction amount of the downstream stand. By doing so, it is possible to suppress the off-gauge defect of the plate thickness at the position where the running plate thickness is changed and to improve the plate thickness accuracy and the yield of the product.

  In the third embodiment, the same control can be performed not only in the case of the first embodiment but also in the case of the second embodiment as the method for identifying the deformation resistance calculation error in the upstream stand.

Embodiment 4 FIG.
FIG. 4 shows a configuration of a control device for a cold continuous rolling mill including a running thickness change control device according to still another embodiment of the present invention. In FIG. 4, the same or corresponding parts as those in the above embodiment are indicated by the same reference numerals. The gauge meter plate thickness calculation unit 15 uses the roll gap measurement value by the reduction cylinder 5 and the rolling load measurement value by the rolling load measuring instrument 11 in the stand upstream one of the downstream stands to be corrected for the roll gap setting value, The thickness of the stand exit side is calculated by a known gauge meter type.

  Next, the operation will be described. In FIG. 4, the tracking plate thickness change position tracking, the calculation method of the deformation resistance calculation error in the upstream stand, and the control method in the running plate thickness change control unit 3 are the same as those in the first embodiment. The roll gap correction amount calculation method is the same as that in the third embodiment.

  The gauge meter plate thickness calculation unit 15 uses the roll gap measurement value by the reduction cylinder 5 and the rolling load measurement value by the rolling load measuring instrument 11 in one upstream stand of the downstream stand to be corrected for the roll gap setting value. Then, the thickness deviation on the stand exit side is calculated using the following equation (5) (each set value and mill constant are from the process computer 2 as in the above embodiment).

  Since the plate thickness deviation calculated by the above equation (5) is the inlet side plate thickness deviation of the downstream stand that is the correction target of the roll gap setting value, the gauge meter plate thickness calculation unit 15 uses the calculation result as the set value correction unit. 12 and applied to the above-described equation (4) instead of the measured value on the entry side thickness deviation in the third embodiment.

  As described above, even when the thickness gauge is not installed on the entry side of the downstream stand, the downstream by the roll gap and the rolling load respectively measured by the rolling cylinder 5 and the rolling load measuring instrument 11 of the one upstream stand. Since the entrance side plate thickness of the stand can be calculated, by using this, it is possible to improve the plate thickness accuracy and yield of the product as in the third embodiment.

  In the fourth embodiment, the same control can be performed not only in the case of the first embodiment but also in the case of the second embodiment as a method for identifying the deformation resistance calculation error in the upstream stand.

Embodiment 5 FIG.
FIG. 5 shows the configuration of a control device for a cold continuous rolling mill including a running thickness change control device according to still another embodiment of the present invention. This embodiment relates to correction of the roll speed set value. In FIG. 5, the same or corresponding parts as those in the above embodiment are indicated by the same reference numerals. A speedometer 16 installed on the exit side of the rolling stand measures the transport speed on the exit side of the material to be rolled. The pulse generator 17 on which the rolling stand 4 is installed measures the rotational speed of the roll R of the rolling stand 4 according to the signal from the motor 6. The set value correction unit 18 calculates the correction amount of the roll speed set value based on the measured values of the speedometer 16 and the pulse generator 17.

  Next, the operation will be described. In calculating the roll speed setting value in the process computer 2, the following formulas (6) and (7) are used so that the relationship between the target speed of the rolled material and the plate thickness is constant between the stands. Yes.

  In FIG. 5, the running plate thickness change control unit 3 detects that the running plate thickness change position in the preceding material 7 and the following material 8 has passed through the rolling stand 4 by tracking. The speed of the material to be rolled on the rolling stand exit side at this time is measured by the speedometer 16 and output to the set value correction unit 18. Further, the rotation speed of the roll is measured by the pulse generator 17 and output to the set value correction unit 18.

  The advanced rate calculation value calculated by the process computer 2 is transmitted to the set value correction unit 18 in advance, and the roll speed correction amount of the corresponding stand is calculated by the following equation (8) (each set value is a process computer) Transmission from 2).

  The set value correction unit 18 transmits the result to the running plate thickness change control unit 3 and adds it to the roll speed set value transmitted in advance from the process computer 2 in the running plate thickness change control unit 3. The roll speed setting value is changed from 7 to the succeeding material 8.

  As described above, the roll speed due to the advanced rate calculation error in the process computer 2 is controlled by correcting the roll speed set value of the corresponding rolling stand based on the measured value of the speedometer installed on the exit side of the rolling stand. It becomes possible to correct the setting error, and it is possible to improve the plate thickness accuracy and the yield of the product by suppressing the off-gauge defect of the plate thickness in the vicinity of the running plate thickness change position.

  In each of the above embodiments, the running plate thickness change control unit 3, the set value correction units 12 and 18, and the gauge meter plate thickness calculation units 13 and 15 can be configured by a computer, for example. Further, the present invention is not limited to the above embodiments, and it goes without saying that all possible combinations thereof are included.

The structure of the control apparatus of the cold continuous rolling mill containing the strip thickness change control apparatus by Embodiment 1 of this invention is shown. The structure of the control apparatus of the cold continuous rolling mill containing the strip thickness change control apparatus by Embodiment 2 of this invention is shown. The structure of the control apparatus of the cold continuous rolling mill containing the strip thickness change control apparatus by Embodiment 3 of this invention is shown. The structure of the control apparatus of the cold continuous rolling mill containing the strip thickness change control apparatus by Embodiment 4 of this invention is shown. The structure of the control apparatus of the cold continuous rolling mill containing the strip thickness change control apparatus by Embodiment 5 of this invention is shown.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Production management computer 2 Process computer 3 Running thickness change control part 4 Rolling stand 5 Rolling cylinder 5 Motor 7 Leading material 8 Trailing material 9, 10, 14 Thickness meter 11 Rolling load Measuring instrument, 12, 18 set value correction unit, 13, 15 gauge meter plate thickness calculation unit, 16 speedometer, 17 pulse generator.

Claims (7)

In a cold continuous rolling mill having a plurality of rolling stands, the cold continuous rolling is performed by controlling the roll gap and roll speed of each rolling stand to the set values of the roll gap and roll speed of each stand obtained by the input calculation. A machine for changing the plate thickness of the machine,
Plate thickness measuring means for determining the plate thickness on the entry side and exit side of the upstream rolling stand,
Rolling load measuring means for measuring the rolling load of the upstream rolling stand;
Setting value correction means for calculating a correction amount for correcting a calculation error related to deformation resistance of the roll gap setting value obtained by the above calculation based on the obtained plate thickness and the measured rolling load;
A running thickness change control means for controlling the roll gap and roll speed of each rolling stand by correcting the roll gap setting value of the downstream rolling stand based on the correction amount,
A strip thickness change control device for a continuous cold rolling mill.   The thickness change means of the cold continuous rolling mill according to claim 1, wherein the plate thickness measuring means comprises plate thickness meters respectively provided on the entry side and the exit side of the upstream rolling stand. Control device.   In the sheet thickness measuring means, the sheet thickness on the outlet side of the upstream rolling stand is calculated from the rolling load measurement value from the rolling load measuring instrument installed in the upstream rolling stand and the roll gap measurement value from the reduction cylinder. 2. The running thickness change control device for a cold continuous rolling mill according to claim 1, wherein the thickness on the inlet side is obtained by measuring with a thickness gauge.   Second plate thickness measuring means for obtaining a plate thickness on the entry side of the downstream rolling stand is further provided, and the set value correcting means and the running plate thickness change control means are used to determine the thickness of the downstream rolling stand based on the obtained plate thickness. The running thickness change control device for a cold continuous rolling mill according to any one of claims 1 to 3, wherein the roll gap set value is corrected and controlled.   5. The running thickness change control of the cold continuous rolling mill according to claim 4, wherein the second thickness measuring means includes a thickness gauge provided on the entry side of the downstream rolling stand. apparatus.   In the second sheet thickness measuring means, the sheet thickness on the entry side of the downstream rolling stand is a rolling load measurement value from a rolling load measuring instrument installed on the one upstream rolling stand of the downstream rolling stand. 5. The running thickness change control device for a cold continuous rolling mill according to claim 4, which is obtained by calculation based on a roll gap measurement value from a rolling cylinder. In a cold continuous rolling mill having a plurality of rolling stands, the cold continuous rolling is performed by controlling the roll gap and roll speed of each rolling stand to the set values of the roll gap and roll speed of each stand obtained by the input calculation. A machine for changing the plate thickness of the machine,
Rolled material speed measuring means for measuring the speed of the rolled material on the exit side of the rolling stand,
Roll rotation speed measuring means for measuring the roll rotation speed of the rolling stand;
A set value correction means for calculating a correction amount for correcting the calculation error of the roll speed set value obtained by the above calculation based on the measured speed of the material to be rolled and the roll rotation speed;
A running plate thickness change control means for controlling the roll gap and roll speed of each rolling stand by correcting the roll speed setting value of the rolling stand based on the correction amount;
A strip thickness change control device for a continuous cold rolling mill.

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