EP2045026B1 - Procédé et dispositif de commande du moulin de dimensionnement de tuyau ou tube - Google Patents

Procédé et dispositif de commande du moulin de dimensionnement de tuyau ou tube Download PDF

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Publication number
EP2045026B1
EP2045026B1 EP08021885A EP08021885A EP2045026B1 EP 2045026 B1 EP2045026 B1 EP 2045026B1 EP 08021885 A EP08021885 A EP 08021885A EP 08021885 A EP08021885 A EP 08021885A EP 2045026 B1 EP2045026 B1 EP 2045026B1
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EP
European Patent Office
Prior art keywords
pipe
tube
stand
prediction error
rotational speed
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EP08021885A
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German (de)
English (en)
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EP2045026A1 (fr
Inventor
Takateru Inage
Fumio Okayama
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Nippon Steel Corp
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Sumitomo Metal Industries Ltd
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Publication of EP2045026A1 publication Critical patent/EP2045026A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/78—Control of tube rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
    • B21B17/14—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling without mandrel, e.g. stretch-reducing mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product

Definitions

  • the present invention relates to a method and device for controlling sizing mill of pipes or tubes, and in particular, to a method and device for controlling a sizing mill capable of suppressing defective thickness of a front or rear end (longitudinal end) of a pipe or tube rolled by the sizing mill effectively.
  • a sizing mill (sizer, stretch reducer or the like) comprising a plurality of stands each of which is provided with two or three grooved rolls (hereinafter referred to as rolling rolls).
  • a sizing mill applies a tensile force in a pipe or tube axis direction of the pipe or tube being rolled by giving a difference to the circumferential speeds of the rolling rolls between adjacent stands to thereby control the thickness of a pipe or tube.
  • the tensile force in the pipe or tube axis direction is not applied sufficiently comparing with the case of rolling the intermediate portion of the pipe or tube, whereby there is caused a phenomenon where the thickness of the front or rear end of the pipe or tube is thicker than the thickness of the pipe or tube intermediate portion. Therefore, the front or rear end of the pipe or tube is cut off as being a part of defective dimension, which result in a lower yield.
  • a pipe end detector 8 such as an HMD
  • a period until the front or rear end of the pipe or tube reaches a first stand is To, and a period from the front or rear end of the pipe or tube leaves an (i-1) th stand until it reaches an i th stand (i ⁇ 2) is T i-1
  • a high precision sensor such as a load measuring device may be disposed at each stand, but it requires enormous capital investment.
  • the present invention is based on the premise of using a method of predicting the time period To and the time period T i-1 (i ⁇ 2) without using a high precision sensor.
  • Japanese Patent No. 2541311 there is proposed a method in which a rolling torque is calculated from the driving current and the rotational speed of a motor for driving rolling rolls, and a timing when an front or rear end of the pipe or tube actually reaches each stand (a timing when a front end bites into rolling rolls or rear end passes out of rolling rolls) is detected from the fluctuating state of the calculated rolling torque, and the rotational speed control start timing (the timing when the rotational speed control starts) of the rolling rolls for the next rolling of the pipe or tube is corrected such that the prediction error in each stand comes into a predetermined range.
  • a prediction error for rolling one pipe or tube is not always the same for the next pipe or tube to be rolled. Accordingly, it is impossible to correct the rotational speed control start timing of rolling rolls accurately for the next pipe or tube to be rolled. As a result, it is impossible to suppress the defective thickness of the front or rear end of the pipe or tube effectively.
  • the pattern of the thickness fluctuation of a front or rear end of the pipe or tube is not always the same, so defective thickness of a front or rear end of the pipe or tube cannot be suppressed fundamentally only by grasping the timing when the front or rear end of the pipe or tube reaches each stand accurately to thereby control the rotational speed of the rolling rolls.
  • JP 07-246414 discloses a method and device in accordance with the precharacterizing sections of claims 1 and 2.
  • An object of the present invention is to provide a method and device for controlling a sizing mill, capable of suppressing defective thickness of a front or rear end of a pipe or tube to be rolled by the sizing mill effectively.
  • the inventors of the present invention intensively studied about factors causing a prediction error between the rotational speed control start timing of the rolling rolls set with respect to each stand and the timing when the front or rear end of the pipe or tube actually reached the stand.
  • a prediction error for the predicted period To until the front or rear end of the pipe or tube reaches the first stand is caused due to a difference between the predicted carried speed and the actual carried speed of the pipe or tube due to the cross-sectional shape and a bend of the pipe or tube as well as abrasion of the carrying conveyor.
  • the prediction error for the predicted period T 0 is a component included in common in the prediction error between the rotational speed control start timing of the rolling rolls set with respect to each stand and the timing when the front or rear end of the pipe or tube actually reaches the stand.
  • Fig. 2 the horizontal axis shows the sequence of pipes or tubes rolled, and the vertical axis shows the ratio of each prediction error component to the predicted period.
  • Fig. 2 will be described in detail.
  • the stand number was plotted in the horizontal axis X, and a prediction error (prediction error between the rotational speed control start timing of the rolling rolls set with respect to each stand and the timing when the front or rear end of the pipe or tube actually reaches the stand) in each stand calculated as described above was plotted in the vertical axis Y
  • a prediction error prediction error between the rotational speed control start timing of the rolling rolls set with respect to each stand and the timing when the front or rear end of the pipe or tube actually reaches the stand
  • the dispersion tendency of the prediction error components To' for the predicted period To does not change a lot even though the manufacturing chance and the material of the pipe or tube differ.
  • the dispersion tendency of the prediction error components ET j ' for the predicted period ⁇ T j changes when the material of the pipe or tube differs. This is due to the fact that the generating factors of the prediction error components of factors outside the stand and the prediction error components of factors inside the stand are different as described above.
  • the dispersion tendencies in the prediction error components of factors outside the stand and the prediction error components of factors inside the stand are different since their generation factors are different. Therefore, if the both prediction error components are divided and are provided separately (e.g., while being weighted differently) for correcting the rotational speed control start timing of the rolling rolls, it is expected that the rotational speed control start timing of the rolling rolls can be corrected appropriately even in a state where the prediction error between the rotational speed control start timing of the rolling rolls set with respect to each stand and the timing when a front or rear end of the pipe or tube actually reaches the stand varies at random, due to the fluctuations of the generation factors.
  • the present invention is provided as a method for controlling sizing mill of a pipe or tube, comprising the steps of calculating a prediction error between a rotational speed control start timing of rolling rolls set with respect to a predetermined stand of a sizing mill and a timing when a front or rear end of the pipe or tube actually reaches the predetermined stand; extracting a first prediction error component until the front or rear end of the pipe or tube reaches a first stand and a second prediction error component after the front or rear end of the pipe or tube reaches the first stand, from the prediction error calculated; applying a first weight to the first prediction error component extracted, and based on the first prediction error component applied with the first weight, correcting the rotational speed control start timing of the rolling rolls set with respect to the predetermined stand; and applying a second weight to the second prediction error component extracted, and based on the second prediction error component applied with the second weight, correcting the rotational speed control start timing of the rolling rolls set with respect to the predetermined stand.
  • the present invention is also provided as a device for controlling sizing mill of a pipe or tube, comprising: a detecting unit for detecting that a front or rear end of the pipe or tube reaches a predetermined stand of a sizing mill; a timing computing unit for correcting a rotational speed control start timing of rolling rolls set with respect to a predetermined stand; and a rolling controller for controlling a rotational speed of rolling rolls provided to each stand based on the rotational speed control start timing corrected by the timing computing unit, wherein the timing computing unit executes a computation including the steps of: calculating a prediction error between the rotational speed control start timing of the rolling rolls set with respect to the predetermined stand and a timing when the front or rear end of the pipe or tube actually reaches the predetermined stand detected by the detecting unit; extracting a first prediction error component until the front or rear end of the pipe or tube reaches a first stand and a second prediction error component after the front or rear end of the pipe or tube reaches
  • Fig. 4 is a block diagram showing the schematic configuration of a sizing mill used for performing a method for controlling sizing mill, according to an embodiment of the present invention.
  • a pipe or tube 1 to be rolled is carried in an axial direction (direction shown by the outlined arrow in Fig. 4 ) by carrying rolls (not shown), and is sized and rolled at each stand 2.
  • a pipe or tube end detector 8 which consists of a photoelectric sensor and detects a front end and rear end of the pipe or tube 1 by the operation of the photoelectric sensor.
  • a ⁇ -ray thickness gauge 9 and a length gauge 10 consisting of a photoelectric sensor or the like are disposed.
  • An end detecting signal of the pipe or tube 1 outputted from the pipe or tube end detector 8 is inputted into a rolling controller 7 and a timing computing unit 6.
  • a thickness measured value of the pipe or tube 1 outputted from the thickness gauge 9 and a length measured value of the pipe or tube 1 outputted from the length gauge 10 are inputted into the timing computing unit 6.
  • a rolling roll 21 provided to each stand 2 is driven by a roll driving motor 3 via a reduction gear 31.
  • a roll driving motor 3 of a stand 2 in, for example, odd-number order counted from the first stand (stand disposed at the most upstream side) is provided with a current detector 32 for detecting a drive current of the roll driving motor 3 and a rotational speed detector 33 for detecting the rotational speed (the present invention is not limited to this configuration, and it is possible to adopt configurations in which the current detector 32 and the rotational speed detector 33 are provided to another predetermined stand or to the roll driving motors 3 of all stands).
  • Detection signals of the current detector 32 and the rotational speed detector 33 are inputted into a motor drive controller 4 for drive-controlling the roll driving motor 3, respectively.
  • a rotational speed control starting signal of the rolling roll 21 has been inputted from the rolling controller 7, and the motor drive controller 4 performs a rotational speed control of the roll driving motor 3 based on the rotational speed control starting signal.
  • the detection signals of the current detector 32 and the rotational speed detector 33 are also inputted into a rolling torque computing unit 5 via the motor drive controller 4.
  • the rolling torque computing unit 5 serves as a detecting unit for detecting that a front or rear end of the pipe or tube reaches a predetermined stand in the present invention.
  • the rolling torque computing unit 5 calculates rolling torque based on the detection signals of the driving current and the rotational speed inputted from the motor drive controller 4, and outputs the calculated rolling torque signal to the timing computing unit 6.
  • the timing computing unit 6 calculates the correction amount of the rotational speed control starting signal, and outputs the calculation result to the rolling controller 7 as a correction signal.
  • the rolling controller 7 To the rolling controller 7, the end detection signal from the pipe or tube end detector 8 and the correction signal from the timing computing unit 6 are inputted. Timing is started at the time when the end detection signal from the pipe or tube end detector 8 is imputed, and when the timing result reaches a stored set value of the rotational speed control start timing of the rolling rolls 21 of each stand 2, the rolling controller 7 outputs a rotational speed control starting signal to each motor drive controller 4 and to each timing computing unit 6. Each motor drive controller 4 lowers the rotational speed of the roll driving motor 3 based on the rotational speed control starting signal inputted. Note that a set value of the rotational speed control start timing is corrected based on the correction signal inputted from the timing computing unit 6, and is stored as a set value used for rolling the next pipe or tube 1.
  • a method of computing the correction amount of the rotational speed control starting signal (correction amount of the rotational speed control start timing) in the timing computing unit 6, based on the rolling torque signal from the rolling torque computing unit 5, the end detection signal from the pipe or tube end detector 8, the thickness measured value of the pipe or tube 1 outputted from the thickness gauge 9, the length measured value of the pipe or tube 1 outputted from the length gauge 10, and the rotational speed control starting signal of the rolling roll 21 from the rolling controller 7, will be described specifically with reference to Figs. 5 and 6 and Fig. 3 described above as appropriate.
  • the method for controlling sizing mill is configured so as to compute the correction amount of the rotational speed control starting signal while taking into account both of the correction amount based on the thickness measured value of a front or rear end of the pipe or tube 1 (hereinafter, referred to as "correction amount based on thickness result” as appropriate) and the correction amount based on a prediction error between the rotational speed control start timing of the rolling rolls 21 and the timing when the front or rear end of the pipe or tube 1 actually reaches (hereinafter, referred to as "correction amount based on prediction error” as appropriate).
  • the respective correction amounts will be described in sequence.
  • Fig. 5 is a diagram showing an example of a thickness measured value of the pipe or tube 1 (average thickness in a pipe or tube circumferential direction) outputted from the thickness gauge 9.
  • the timing computing unit 6 first calculates an average thickness tm in a length Lm, in the intermediate portion of the pipe or tube 1, shown by the following equation (1), based on the thickness measured value of the pipe or tube 1 outputted from the thickness gauge 9 and the length measured value of the pipe or tube 1 outputted from the length gauge 10:
  • Lm L - Lct + Lt + Lcb + Lb
  • L means the length of the pipe or tube 1 at the output side of the sizing mill
  • Lct means the crop length at the front end of the pipe or tube 1 defined in advance according to the type and dimensions of the pipe or tube 1
  • Lt means the front end length of the product part of the pipe or tube 1 defined in advance
  • Lcb means the crop length at the rear end of the pipe or tube 1 defined in advance
  • Lb means the rear end length of the product part of the pipe or tube 1 defined in advance.
  • front end length Lt and the rear end length Lb of the product part are lengths in predetermined proportional to the length (or target length) of the pipe or tube 1 at the output side of the sizing mill, or are constant lengths irrespective of the length of the pipe or tube 1.
  • the timing computing unit 6 calculates the increased thickness length Lzt of the front end.
  • tup and tlo are values which have been determined beforehand.
  • the increased thickness length Lzt of the front end means the length from a portion where the thickness first increases from the average thickness tm by tup viewed from the most inner side of the portion corresponding to the front end length Lt of the product part of the pipe or tube 1, to a portion coming inside by the crop length Lct from the tip of the pipe or tube 1, as shown in Fig. 5(a) .
  • the timing computing unit 6 calculates the increased thickness length Lzb of the rear end.
  • the increased thickness length Lzb of the rear end means the length from a portion where the thickness first increases from the average thickness tm by tup viewed from the most inner side of the portion corresponding to the rear end length Lb of the product part of the pipe or tube 1, to a portion coming inside by the crop length Lcb from the rear end of the pipe or tube 1.
  • the values of tup and tlo may take the same values in the front end and the rear end of the pipe or tube 1, or may be different.
  • Kt means a constant (weight) set to a value of 0 to 1
  • L0 means the length of the pipe or tube 1 at the input side of the sizing mill (it is measurable by arranging a length gauge on the input side of the sizing mill or by measuring the length in the step of the previous stage of the sizing mill)
  • VO means the speed of the pipe or tube 1 at the input side of the sizing mill (it is measurable by arranging a speed meter on the input side of the sizing mill, or by arranging two pipe or tube end detectors 8 described above and dividing the distance between the pipe or tube end detectors 8 by the difference between the detection times).
  • L/L0 means the elongation percentage of the pipe or tube 1 (percentage of the pipe or tube being elongated) by the sizing mill
  • a value, obtained by dividing the increased thickness length Lzt of the front end by L/L0 corresponds to the length of the increased thickness length of the front end at the input side of the sizing mill.
  • Kb means a constant (weight) set to a value of 0 to 1.
  • Lzb ⁇ L0/L/V0 means a time period in which a portion correspond to the increased thickness length Lzb of the rear end is generated. Accordingly, it is possible to suppress generation of the portion corresponding to the increased thickness length of the rear end by setting ⁇ Tb1 shown by the above-mentioned equation (3) as the correction amount, and rolling the next pipe or tube 1 by uniformly adding the correction amount ⁇ Tb1 to the rotational speed control start timing of the rolling rolls 21 set with respect to each stand 2 (advancing the rotational speed control start timing by a period corresponding to the absolute value of ⁇ Tt1).
  • the timing computing unit 6 calculates the reduced thickness length Lgt of the front end.
  • the reduced thickness length Lgt of the front end means the length from a portion where the thickness is first reduced from the average thickness tm by tlo viewed from the most inner side of the portion corresponding to the front end length Lt of the product part of the pipe or tube 1, to a portion coming inside by the crop length Lct from the tip of the pipe or tube 1.
  • the timing computing unit 6 calculates the reduced thickness length Lgb of the rear end.
  • the reduced thickness length Lgb of the rear end means the length from a portion where the thickness is first reduced from the average thickness tm by tlo viewed from the most inner side of the portion corresponding to the rear end length Lb of the product part of the pipe or tube 1, to a portion coming inside by the crop length Lcb from the rear end of the pipe or tube 1.
  • the timing computing unit 6 starts timing at a timing where an end (front end or rear end) detection signal is imputed from the pipe or tube end detector 8 to the timing computing unit 6 as a starting point, and based on the fluctuation state of a rolling torque signal inputted from the rolling torque computing unit 5, detects the timing where the end (front end or rear end) of the pipe or tube 1 actually reaches the predetermined stand 2 (stand in odd-number order in this embodiment) (that is, an elapsed time period starting from the time when the end detecting signal is imputed, hereinafter referred to as a "measured period" as appropriate).
  • the timing computing unit 6 detects an elapsed time period starting from the time when the end detecting signal is inputted from the pipe or tube end detector 8 to the timing computing unit 6, to the time when the rotational speed control starting signal of the rolling roll 21 is inputted from the rolling controller 7 (hereinafter, referred to as "predicted period" as appropriate), and calculates the prediction error Y j between the predicted period and the measured period.
  • the timing computing unit 6 first, based on plural pieces of data (i, Y i ) plotted by assuming the horizontal axis X being the stand number and the vertical axis Y being the prediction error between the predicted period and the measured period (see Fig. 3 ), the correlation coefficient R between X and Y is calculated (S1 in Fig. 6 ), and the calculated correlation coefficient R is determined whether it is below the predetermined value (S2 in Fig. 6 ).
  • the prediction error Y i only includes a prediction error component of the factor outside the stand, and based on (i, Y i ), a primary regression equation ofY, where X is a variable, is calculated (S3 in Fig. 6 ). Then, a Y section of the primary regression equation is defined as a prediction error To' between the predicted period and the measured period in the first stand (see S4 in Fig. 6 , and Fig. 3 ).
  • the sum of squares ⁇ (Y i - T 0 ') 2 of the difference between the prediction error Y i and the prediction error To' and the sum of squares ⁇ (Y i ) 2 of the prediction error Y i are compared (S5 in Fig. 6 ), and if ⁇ (Y i - T 0 ') 2 ⁇ ⁇ (Y i ) 2 , the computation ends since there is no need to correct the rotational speed control starting signal relating to the correction amount based on the prediction error.
  • the timing computing unit 6 multiplies the prediction error T 0 ' by a first weight (value of 0 to 1, e.g., 0.5), and outputs a correction signal in which the prediction error To' multiplied by the first weight is set as the correction amount to the rolling controller 7 (S6 in Fig. 6 ).
  • the correction amount ATt2 based on the prediction error is added to the rotational speed control start timing of the rolling rolls 21 of each stand 2 uniformly (subtracting the prediction error To' multiplied by the first weight), which is used for rolling the next pipe or tube 1 (S6 in Fig. 6 ).
  • the timing computing unit 6 calculates a primary regression equation based on (i, Y i ) similar to that described above (S7 in Fig. 6 ), and sets the calculated Y section of the of the primary regression equation as the prediction error To' between the predicted period and the measured period in the first stand (see S8 in Fig. 6 and Fig. 3 ).
  • the prediction error To' is multiplied by a first weight (value of 0 to 1, e.g., 0.5), and a correction signal in which the prediction error To' multiplied by the first weight is set as the correction amount is outputted to the rolling controller 7 (S9 in Fig. 6 ).
  • the correction amount is subtracted from the rotational speed control start timing of the rolling rolls 21 of each stand 2 uniformly (S9 in Fig. 6 ). In other words, through the processing shown in S9 of Fig. 6 , the prediction error component of the factor outside the stand included in the prediction error Y i is corrected.
  • the correction amount is further subtracted from the rotational speed control start timing, for the next pipe or tube, of the rolling roll 21 in each stand (i th stand) (S11 in Fig. 6 ).
  • the prediction error component of the factor inside the stand, included in the prediction error Y i is corrected.
  • this embodiment has described such a configuration that, based on the data (i, Y i ) plotted on the premise that the horizontal axis X shows the stand number i and the vertical axis Y shows the prediction error Y i between the predicted period and the measured period, a primary regression equation ofY where X is variable is calculated, and with the primary regression equation, a prediction error component of a factor outside the stand and a prediction error component of a factor inside the stand are separated.
  • the present invention is not limited to this configuration.
  • N th integer of N > 1 regression equation ofY where X is variable is calculated based on data (i, Y j ), and a prediction error component of a factor outside the stand and a prediction error component of a factor inside the stand are separated.
  • first weight and the second weight the same values may be adopted in the front end and the rear end of the pipe or tube 1, or different values may be adopted.
  • At is a constant of 0 to 1
  • ⁇ t is a constant of 1 - at.
  • the set value of the rotational speed control start timing of the rolling rolls 21 set with respect to each stand 2 relating to the front end of the pipe or tube 1 is corrected based on the correction amount ⁇ Tt stored (correction amount ⁇ Tt is added), which is used as a set value for rotating the next pipe or tube 1.
  • ⁇ Tb ⁇ b ⁇ ⁇ Tb ⁇ 1 + ⁇ b ⁇ ⁇ Tb ⁇ 2
  • ⁇ b is a constant of 0 to 1
  • ⁇ b is a constant of 1- ⁇ b.
  • the set value of the rotational speed control start timing of the rolling rolls 21 set with respect to each stand 2 relating to the rear end of the pipe or tube 1 is corrected based on the correction amount ⁇ Tb stored (correction amount ⁇ Tb is added), which is used as a set value for rotating the next pipe or tube 1.
  • the rotational speed control start timing of the rolling rolls 21 set with respect to each stand 2 is corrected based on the thickness measured values of the front and rear end of the pipe or tube 1 measured at the output side of the sizing mill. Therefore, it is expected that the rotational speed control start timing of the rolling rolls 21 is corrected so as to be appropriate for the actual thickness fluctuations of the front and rear end of the pipe or tube.
  • the prediction error is divided into two prediction error components of different factors (a prediction error component of a factor outside the stand and a prediction error component of a factor inside the stand) which are weighted respectively (it is possible to differ first and second weights applied to the both prediction error components respectively) and are provided to correct the rotational speed control start timing of the rolling rolls 21, it is possible to correct the rotational speed control start timing of the rolling rolls 21 appropriately in a state where the prediction error between the rotational speed control start timing of the rolling rolls 21 set with respect to each stand 2 and the timing when a front or rear end of the pipe or tube 1 reaches each stand 2 varies at random along with the fluctuation of the generation factors of the prediction error. Accordingly, it is possible to suppress defective front and rear end thickness of the pipe or tube 1 rolled by the sizing mill, effectively.
  • the set value of the rotational speed control start timing of the rolling rolls 21 set with respect to each stand 2 relating to the front end of the pipe or tube 1 is corrected based on the stored correction amount ⁇ Tt (correction amount ⁇ Tt is added), which is used as a set value for rolling the next pipe or tube L
  • the set value of the rotational speed control start timing of the rolling rolls 21 set with respect to each stand 2 relating to the rear end of the pipe or tube 1 is corrected based on the stored correction amount ⁇ Tb (correction amount ⁇ Tb is added), which is used as the set value for rolling the next pipe or tube 1.
  • the rotational speed control start timing of the rolling rolls 21 set with respect to each stand 2 is corrected based on the thickness measured values of the front and rear end of the pipe or tube 1 measured at the output side of the sizing mill, so it is expected that the rotational speed control start timing of the rolling rolls 21 can be corrected so as to be appropriate for the actual thickness fluctuations of the front and rear ends of the pipe or tube.
  • the rotational speed control start timing of the rolling rolls 21 can be corrected so as to be appropriate for the actual thickness fluctuations of the front and rear ends of the pipe or tube.
  • a method for controlling sizing mill is configured to use a prediction error Yi between the predicted period and the measured period in each stand 2 as it is.
  • the correction amounts based on the prediction errors are ⁇ Tt2 and ⁇ Tb2 (in this embodiment, however, measured periods must be detected not only for the stands in odd-number order but for all stands, different from the first embodiment).
  • the rotational speed control start timing of the rolling rolls 21 is corrected by using not only the thickness measured values of the front and rear ends of the pipe or tube 1 measured at the output side of the sizing mill but also the prediction errors between the rotation speed control start timings of the rolling roll set with respect to each stand 2 and the timing when the front or rear end of the pipe or tube 1 actually reach each stand 2. Therefore it is expected that the rotational speed control start timing of the rolling rolls 21 can be corrected so as to be more appropriate than the case of the Example, whereby it is possible to suppress defective thicknesses in front and rear ends of the pipe or tube 1 rolled by the sizing mill, effectively.
  • the set value of the rotational speed control start timing of the rolling rolls 21 set with respect to each stand 2 relating to the front end of the pipe or tube 1 is corrected based on the stored correction amount ⁇ Tt (the correction amount ⁇ Tt is added), which is used as the set value for rolling the next pipe or tube 1.
  • the set value of the rotational speed control start timing of the rolling rolls 21 set with respect to each stand 2 relating to the rear end of the pipe or tube 1 is corrected based on the stored correction amount ⁇ Tb (the correction amount ⁇ Tb is added), which is used as the set value for rolling the next pipe or tube 1.
  • the prediction error is divided into two prediction error components of different factors (a prediction error component of a factor outside the stand and a prediction error component of a factor inside the stand) which are weighted respectively (it is possible to differ first and second weights applied to the both prediction error components respectively) and are provided to correct the rotational speed control start timing of the rolling rolls 21, it is possible to correct the rotational speed control start timing of the rolling rolls 21 appropriately in a state where the prediction errors between the rotational speed control start timings of the rolling roll 21 set to each stand 2 and the timings when front and rear ends of the pipe or tube 1 reach each stand 2 varies at random along with the fluctuations of the generation factors of the prediction errors. Accordingly, it is possible to suppress defective thicknesses in the front and rear ends of the pipe or tube 1 rolled by the sizing mill, effectively.
  • Figs. 7(a) and 7(b) show exemplary results of evaluating prediction error between the rotational speed control start timing of the rolling rolls 21 corrected with respect to a predetermined stand 2 and the timing when a front or rear end of the pipe or tube 1 actually reaches the predetermined stand 2, in the case of applying the method for controlling sizing mill (method for correcting rotational speed control start timing of rolling roll 21) according to the fourth embodiment of the present invention.
  • Fig. 7(a) shows a prediction error in the case of applying the method according to the third embodiment of the present invention, and Fig.
  • FIG. 7(b) shows a prediction error in the case of applying the conventional method (prediction error between the rotational control start timing of the rolling rolls 21 which has been set beforehand with respect to the predetermined stand 2 (including a case where correction is performed manually by the operator) and the timing when the front or rear end of the pipe or tube 1 actually reaches the predetermined stand 2).
  • the absolute value of the average value of prediction errors becomes small and the dispersion also becomes small comparing with the case of applying the conventional method ( Fig. 7(b) ), whereby it was possible to correct the rotational speed control start timing of the rolling rolls 21, appropriately.
  • the increased thickness ratio of end shown in Fig. 8 is a value indicated by (thickness at each portion of end - average thickness (tm))/average thickness (tm) ⁇ 100 (%).
  • the tolerance failure ratio of the thickness of the pipe or tube 1 after being rolled was evaluated, in the case of applying the methods for controlling sizing mill according to the first to fourth embodiments of the present invention and methods of comparative examples. More specifically, 50 to 100 pipes or tubes for each manufacturing chance were sized and rolled for three manufacturing chances in total under the following conditions of (1) to (6), and the tolerance failure ratios were evaluated for the front ends (portions corresponding to the crop lengths Lct and the front end lengths Lt of the product parts) after being rolled, for each chance.
  • tolerance failure ratio means the ratio of the number of pipes or tubes in which the average thicknesses of the front ends are out of the range of (tm - tlo) to (tm - tup) to the total number of rolled pipes or tubes:
  • Table 1 shows evaluation results. Note that Examples 1-1 and 1-2 in Table 1 show a method for controlling sizing mill, corresponding to the first embodiment.
  • Example 2, Example 3 and Example 4 are methods for controlling sizing and fixing, corresponding to the Example, the second embodiment and the third embodiment, respectively.
  • Comparative Example 1 is a method of using a prediction error between the predicted period and the measured period in each stand as the correction mount as it is, without performing thickness measurement.
  • Comparative Example 2 is a method in which correction is performed manually by the operator, without performing thickness measurement.
  • the tolerance failure ratio was lowered in the method of Example 4, comparing with Comparative Examples 1 and 2.
  • the prediction error between the predicted period and the measured period in each stand was used as it was as the correction amount, so an influence of the measurement error of the measured period directly affected, whereby the prediction error was difficult to be solved.
  • the correction amount was approximated by a primary regression equation, whereby it was less likely to be affected by the measurement error of the measured period, so it was considered that the tolerance failure ratio was lowered consequently.
  • correction based on the thickness result was added to the method of Comparative Example 1, whereby it was possible to reduce the tolerance failure ratio comparing with the methods of Comparative Examples 1 and 2.
  • the prediction error in each stand was defined as the correction amount based on the prediction error as it was, similar to the method of Comparative Example 1, it was difficult to solve the prediction error, so the tolerance failure ratio was also somewhat difficult to be solved, consequently. Further, as for the method of Example 2, it was possible to reduce the tolerance failure ratio comparing with the methods of Comparative Examples 1 and 2, since a correction based on the thickness result was performed. However, since a correction based on the prediction error was not performed, the tolerance failure ratio was less likely to be solved comparing with the methods of Examples 1-1, 1-2 and 3.
  • Example 1-1 since a correction based on the thickness result and a correction based on the prediction error based on a primary regression equation are performed, the tolerance failure ratio was lowered and was possible to be solved quickly, comparing with not only Comparative Examples 1 and 2 but also Examples 2 to 4. Further, in the methods of Example 1-2, since different coefficients were used in the case of the same manufacturing chance and in the case of the manufacturing chance being changed (at the timing where the manufacturing chance is changed, the value of ⁇ t is increased such that the correction amount based on the thickness result contributes more), it was possible to solve the tolerance failure ratio more quickly than the method of Example 1-1. This is because the correction amount based on the thickness result may depend more on the dimensions of the pipe or tube than the manufacturing chances.
  • the correction result in the prior manufacturing chance can be utilized in a more effective manner by setting coefficients such that the correction amount based on the thickness result contributes more at timing when the manufacturing chance is changed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)

Claims (2)

  1. Procédé pour commander un laminoir calibreur d'un tuyau ou d'un tube (1), caractérisé par les étapes consistant à :
    calculer une erreur de prédiction entre une synchronisation de démarrage de commande de vitesse de rotation de cylindres (21) définie par rapport à une cage prédéterminée (2) d'un laminoir calibreur et une synchronisation lorsqu'une extrémité avant ou arrière du tuyau ou du tube (1) atteint réellement ladite cage prédéterminée (2),
    extraire une première composante d'erreur de prédiction jusqu'à ce que l'extrémité avant ou arrière du tuyau du tube (1) atteigne une première cage et une seconde composante d'erreur de prédiction une fois que l'extrémité avant ou arrière dudit tuyau ou tube (1) a atteint la première cage, à partir de ladite erreur de prédiction calculée,
    appliquer une première pondération à ladite première composante d'erreur de prédiction extraite et, sur la base de la première composante d'erreur de prédiction appliquée avec la première pondération, corriger la synchronisation de démarrage de commande de vitesse de rotation des cylindres (21) définie par rapport à ladite cage prédéterminée, et
    appliquer une seconde pondération à ladite seconde composante d'erreur de prédiction extraite et, sur la base de la seconde composante d'erreur de prédiction appliquée avec la seconde pondération, corriger la synchronisation de démarrage de commande de vitesse de rotation des cylindres (21) définie par rapport à ladite cage prédéterminée (2).
  2. Dispositif pour commander un laminoir calibreur d'un tuyau ou d'un tube (1) comportant :
    un contrôleur de roulement (7) pour commander une vitesse de rotation de cylindres agencés dans chaque cage,
    caractérisé par :
    une unité de détection (5) pour détecter qu'une extrémité avant ou arrière du tuyau ou du tube atteint une cage prédéterminée (2) d'un laminoir calibreur ; et
    unité de calcul de synchronisation (6) pour corriger une synchronisation de démarrage de commande de vitesse de rotation de cylindres (21) définie par rapport à une cage prédéterminée (2), dans lequel
    le contrôleur de roulement (7) commande la vitesse de rotation de cylindres (21) agencés dans chaque cage (2) sur la base de la synchronisation de démarrage de commande de vitesse de rotation corrigée par ladite unité de calcul de synchronisation (6),
    ladite unité de calcul de synchronisation (6) exécute un calcul incluant les étapes consistant à :
    calculer une erreur de prédiction entre la synchronisation de démarrage de commande de vitesse de rotation des cylindres (21) définie par rapport à la cage prédéterminée et une synchronisation lorsque l'extrémité avant ou arrière du tuyau ou du tube (1) atteint réellement ladite cage prédéterminée (2) détectée par ladite unité de détection (5),
    extraire une première composante d'erreur de prédiction jusqu'à ce que l'extrémité avant ou arrière du tuyau ou du tube (1) atteigne une première cage et une seconde composante d'erreur de prédiction une fois que l'extrémité avant ou arrière dudit tuyau ou tube (1) a atteint la première cage, à partir de ladite erreur de prédiction calculée,
    appliquer une première pondération à ladite première composante d'erreur de prédiction extraite, et sur la base de la première composante d'erreur de prédiction appliquée avec la première pondération, corriger la synchronisation de démarrage de commande de vitesse de rotation des cylindres (21) définie par rapport à ladite cage prédéterminée (2), et
    appliquer une seconde pondération à ladite seconde composante d'erreur de prédiction extraite, et sur la base de la seconde composante d'erreur de prédiction appliquée avec la seconde pondération, corriger la synchronisation de démarrage de commande de vitesse de rotation des cylindres (21) définie par rapport à ladite cage prédéterminée (2).
EP08021885A 2004-03-30 2005-03-30 Procédé et dispositif de commande du moulin de dimensionnement de tuyau ou tube Ceased EP2045026B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004098841 2004-03-30
EP05721677A EP1733817B1 (fr) 2004-03-30 2005-03-30 Procede et dispositif de controle de roulement de diametre fixe de tube

Related Parent Applications (2)

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EP05721677A Division EP1733817B1 (fr) 2004-03-30 2005-03-30 Procede et dispositif de controle de roulement de diametre fixe de tube
EP05721677.2 Division 2005-03-30

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EP2045026A1 EP2045026A1 (fr) 2009-04-08
EP2045026B1 true EP2045026B1 (fr) 2012-07-04

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JP (1) JP4697605B2 (fr)
CN (1) CN100409956C (fr)
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WO (1) WO2005095013A1 (fr)

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Publication number Priority date Publication date Assignee Title
EP2133159B1 (fr) * 2007-03-30 2013-01-23 Nippon Steel & Sumitomo Metal Corporation Procédé de fabrication de tuyaux sans soudure
CN102245320B (zh) * 2008-12-24 2015-09-02 新日铁住金株式会社 利用冷轧制造无缝金属管的方法
ITUD20120026A1 (it) * 2012-02-17 2013-08-18 Danieli Automation Spa Impianto per il controllo dell'area della sezione di un prodotto laminato e relativo procedimento
ITMI20121559A1 (it) * 2012-09-19 2014-03-20 Sms Innse Spa Miglioramento in un impianto di laminazione
DE102017220750A1 (de) * 2017-11-21 2019-05-23 Sms Group Gmbh Vorrichtung zur Steuerung eines Streckreduzierwalzwerks
DE102018214002A1 (de) * 2018-08-20 2020-02-20 Sms Group Gmbh Verfahren und Vorrichtung zum Steuern eines Streckreduzierwalzwerks zwecks Wanddickenkompensation
DE102018217378B3 (de) * 2018-10-11 2020-03-26 Sms Group Gmbh Wanddickenkontrolle beim Streckreduzieren von Rohren
CN109719139B (zh) * 2019-02-11 2020-07-28 黑龙江建龙钢铁有限公司 一种无缝钢管端部壁厚自动控制系统
CN111729936B (zh) * 2020-07-06 2022-04-26 中冶赛迪重庆信息技术有限公司 一种无缝钢管切头控制方法及装置

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JPS58196111A (ja) * 1982-05-10 1983-11-15 Kawasaki Steel Corp 鋼管の延伸圧延方法
JPS6064717A (ja) * 1983-09-19 1985-04-13 Toshiba Corp 連続圧延スタンドの速度制御装置
JPS61140317A (ja) * 1984-12-12 1986-06-27 Kawasaki Steel Corp マンドレルミルの圧延制御方法
JP2541311B2 (ja) 1989-07-05 1996-10-09 住友金属工業株式会社 絞り圧延機の管端制御開始点学習方法
JPH06142743A (ja) * 1992-11-11 1994-05-24 Sumitomo Metal Ind Ltd 絞り圧延機による管端肉厚制御方法
JPH07246414A (ja) 1994-03-10 1995-09-26 Nkk Corp ストレッチレデューサーの管端部肉厚制御方法
JP3567837B2 (ja) * 1999-12-24 2004-09-22 住友金属工業株式会社 絞り圧延機の管端肉厚制御開始時間学習方法
DE10201717C1 (de) * 2002-01-18 2003-04-10 Sms Meer Gmbh Verfahren und Vorrichtung zum Walzen eines Rohres
JP4013659B2 (ja) * 2002-06-13 2007-11-28 住友金属工業株式会社 管圧延機の肉厚制御方法

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Publication number Publication date
DE602005024782D1 (de) 2010-12-30
EP1733817B1 (fr) 2010-11-17
EP1733817A1 (fr) 2006-12-20
CN1909987A (zh) 2007-02-07
JP4697605B2 (ja) 2011-06-08
EP1733817A4 (fr) 2008-02-20
EP2045026A1 (fr) 2009-04-08
CN100409956C (zh) 2008-08-13
WO2005095013A1 (fr) 2005-10-13
JPWO2005095013A1 (ja) 2008-02-21

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