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Drawing/rolling control method

A control method and rolling mill technology, which are applied in the fields of rolling mill control device, metal rolling, metal rolling, etc., can solve the problems such as the inability to improve the precision of the front-stage rolling mill, and achieve the effect of suppressing the occurrence of rolling failures and high dimensional accuracy.

Inactive Publication Date: 2010-04-21
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, what can be corrected by this method is only the pressing position of the grooved roll installed on the final rolling mill.
Therefore, in the conventional control method of a mandrel mill using a gamma-ray wall thickness gauge, the accuracy of zero-point adjustment of the reduction position of the preceding mill cannot be improved.

Method used

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  • Drawing/rolling control method
  • Drawing/rolling control method
  • Drawing/rolling control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0040] figure 1 It is an explanatory diagram schematically showing a schematic configuration of a mandrel mill (positioning type mandrel mill using a mandrel positioner BR) apparatus to which the control method of Embodiment 1 is applied.

[0041] Such as figure 1 As shown, in the control method of this embodiment, between predetermined rolling mills arranged in a mandrel mill (between figure 1 In the example shown, it is the ultrasonic wall thickness gauge 1 between #1 and #2 rolling mills).

[0042] The ultrasonic wall thickness gauge 1 used in this embodiment is a laser ultrasonic wall thickness gauge. The laser ultrasonic wall thickness meter 1 has: a pulse laser for transmitting ultrasonic waves from the outer surface of the tube blank P to its inside; a continuous oscillating laser and an interferometer for receiving the ultrasonic waves reflected by the inner surface of the tube blank P. High-intensity pulsed laser light is emitted from a pulsed laser. The emitte...

Embodiment approach 2

[0051] figure 2 It is an explanatory diagram schematically showing a schematic configuration of a mandrel mill device to which the control method of Embodiment 2 is applied.

[0052] Such as figure 2 As shown, similarly to the above-mentioned first embodiment, in the control method of this embodiment also, the control method between the predetermined rolling mills arranged in the mandrel mill (between figure 2 In the example shown, it is also the ultrasonic wall thickness gauge 1 between #1 and #2 rolling mills).

[0053] However, the control method of this embodiment is different from the first embodiment in that it is not limited to being applied to a positioning type mandrel mill using a mandrel positioner. In addition, the ultrasonic wall thickness gauge 1 of the present embodiment is arranged so as to measure the figure 2 In the shown example, the wall thickness of the flange of the blank pipe P in #1 rolling mill) is also different from Embodiment 1 in this point....

Embodiment approach 3

[0058] image 3 It is an explanatory diagram schematically showing a schematic configuration of a mandrel mill device to which the control method of Embodiment 3 is applied.

[0059] Such as image 3 As shown, the control method of this embodiment is different from the first and second embodiments described above in that the ultrasonic wall thickness gauge 1 is arranged near the exit side of the mandrel mill. In addition, in order to measure the wall thickness distribution of the tube blank P along the circumferential direction, a plurality of ultrasonic wall thickness gauges 1 are provided along the circumferential direction of the tube blank P, or the ultrasonic wall thickness gauge 1 can scan along the circumferential direction of the tube blank P. It is also different from Embodiment 1 and Embodiment 2 in one point. Since other device configurations of this embodiment are the same as those of the above-mentioned second embodiment, description thereof will be omitted.

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Abstract

A drawing / rolling control method capable of manufacturing a raw tube with high dimensional accuracy and suppressing a trouble in rolling. The groove bottom wall thickness of the raw tube (P) is measured on a #1 stand with an ultrasonic wall thickness meter (1) installed between the #1 stand and a #2 stand, the outer diameter of a mandrel bar (B) is calculated based on the set value of a roll gap and the groove bottom wall thickness of the raw tube (P) on the #1 stand, and the longitudinal portion of the mandrel bar (B) at which its outer diameter is calculated based on information on the position of a bar retainer (BR) is specified. By repeating the steps above, the longitudinal distribution of the outer diameters of the mandrel bar is calculated, the longitudinal portions of the mandrel bar in contact with the raw tube on subsequent stage stands are specified based on the information on the position of the bar retainer, and the roll gaps on the subsequent stage stands are set based onthe outer diameters of the specified longitudinal portions of the mandrel bar.

Description

technical field [0001] The invention relates to an elongation rolling control method. More specifically, the present invention relates to a method for manufacturing seamless pipes with high dimensional accuracy by measuring the wall thickness of a blank pipe into which a mandrel is inserted and then controlling a mandrel mill for seamless pipes based on the measurement results, or An elongation rolling control method for suppressing rolling faults. Background technique [0002] Conventionally, many inventions have been proposed in which the thickness of an object is measured using a gamma ray thickness gauge, and the rolling conditions are set and corrected based on the measurement result (for example, refer to Patent Document 1). [0003] The gamma ray wall thickness gauge measures the wall thickness based on the attenuation of gamma rays penetrating the object. Due to this measurement principle, the wall thickness of the blank pipe in which the mandrel is inserted cannot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/78B21B17/02
CPCB21B37/78B21B17/04
Inventor 岩本宏之
Owner NIPPON STEEL CORP