Method and device for controlling fixed diameter rolling of tube
A control method and control device technology, which is applied in rolling mill control devices, metal rolling, length measuring devices, etc., can solve the problem of unqualified pipe end wall thickness and pipe end wall thickness that cannot be corrected and cannot be effectively suppressed. Unqualified and other issues
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no. 1 Embodiment approach
[0041] Fig. 4 is a block diagram showing a schematic configuration of a sizing rolling mill used for implementing a sizing rolling control method according to an embodiment of the present invention. As shown in FIG. 4 , the pipe 1 to be rolled is conveyed in the axial direction (in the direction of the hollow arrow in FIG. 4 ) by conveying rollers (not shown), and sizing rolling is performed in each rolling mill 2 . A pipe end detector 8 is arranged near the entry side of the sizing rolling mill on the conveyance path of the pipe 1. The pipe end detector 8 is composed of a photoelectric sensor, and the pipe end of the pipe 1 is detected by the operation of the photoelectric sensor. parts (front end and rear end). In addition, a gamma-ray thickness gauge 9 and a length gauge 10 composed of a photoelectric sensor and the like are arranged near the exit side of the sizing rolling mill on the conveyance path of the pipe 1 . The pipe end detection signal of the pipe 1 output from ...
no. 2 Embodiment approach
[0088] The sizing rolling control method according to this embodiment is configured to use only the correction amount based on the wall thickness result in the first embodiment described above. That is, at the start timing of the rotation speed control of the rolls 21 set for each of the rolling mills 2 associated with the front end of the pipe 1, ΔTt=ΔTt1 (that is, αt=1, βt=0 in the aforementioned equation (6)) is determined by It is stored in the rolling controller 7 as the comprehensive correction amount. And, the setting value of the rotation speed control start time of the roll 21 set for each rolling mill 2 related to the front end portion of the pipe 1 is corrected (adding the correction amount ΔTt) based on the aforementioned stored correction amount ΔTt, and used as Setpoint when rolling the next tube 1. Similarly, at the start timing of the rotation speed control of the rolls 21 set for each of the rolling mills 2 related to the rear end of the pipe 1, ΔTb=ΔTb1 (tha...
no. 3 Embodiment approach
[0091] The sizing rolling control method related to this embodiment directly uses the prediction error Y between the predicted time and the actual measured time in each rolling mill 2 i As a structure based on the correction amounts ΔTt2 and ΔTb2 of the prediction error in the first embodiment described above (however, in this embodiment, unlike the first embodiment, it is necessary to detect not only the odd-numbered rolling mills, but also all the rolling mills. time). That is, let ΔTt2=-Y i (Regarding the prediction error of the front end), let ΔTt2=-Y i (Regarding the prediction error of the rear end portion), the correction amount is calculated according to the aforementioned equations (6) and (7).
[0092] According to the sizing rolling control method according to this embodiment, not only the measured value of the wall thickness of the pipe end portion of the pipe 1 measured at the exit side of the sizing rolling mill, but also the value set for each rolling mill 2 a...
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