JP2004074228A - Control method of rolling equipment for bar, wire and the like - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve quality of a bar, a wire and the like by enabling exact speed control at all times even in such cases as a rolling roll wear and a steel type change of a workpiece. <P>SOLUTION: In rolling equipment to draw a workpiece 4 for a bar, a wire and the like into a small diameter by passing it through roll stands 1, 2, 3 arranged in multiple steps, laser Doppler speed indicators 8, 9, 10 are installed at the entry and delivery sides of each roll stand to measure actual speed of the workpiece pulled in and out at each roll stand. Rotating speed of rolling rolls 1a, 2a, 3a at each roll stand is controlled based on the measured speed by the laser Doppler speed indicators. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for controlling the rotation speed and the like of a rolling roll in a rolling device that stretches to a small diameter by passing a processing material such as a rod or a wire through a roll stand provided in multiple stages.
[0002]
[Prior art]
2. Description of the Related Art In a rolling device in which the outer diameter of a processing material such as a rod or a wire is gradually reduced to a small diameter by passing through a multi-stage roll stand, generally, a rotation speed is controlled by a common drive system for a rolling roll of each roll stand. Then, a predetermined tension is maintained on the processing material between the roll stands.
[0003]
[Problems to be solved by the invention]
However, since the rotation speed of the conventional rolling roll was kept constant at a predetermined speed, for example, the rolling roll is worn out, or the steel type of the processing material is changed, so that it becomes difficult to maintain the tension, There was a risk of adversely affecting the quality.
Further, in the past, since the speed of the processing material was estimated based on the rotation speed of the rolling roll, if the rolling roll was worn as described above, the difference between the estimated speed and the actual speed became large. For this reason, the command of the water cooling start point for activating the water cooling device to water-cool a part of the processing material length is not properly performed, or the timing of issuing a start command to the shear to cut the processing material at a predetermined length is not sufficient. There was a problem that it was not performed properly.
Therefore, the present invention allows the actual speed of the processing material to be always accurately measured, and controls the rotation speed of the rolling roll of the roll stand based on the measurement so that the above-described problem is solved. It is to be.
[0004]
[Means for Solving the Problems]
For this purpose, the control method according to the present invention is directed to a rolling device in which a processing material such as a bar or a wire is passed through a multi-stage roll stand to elongate to a small diameter. Providing a Doppler velocimeter to measure the speed of the processing material to be inserted into and extracted from each of the roll stands, and to control the rotation speed of the rolling roll of each of the roll stands in accordance with the speed actually measured by the laser Doppler velocimeter. It is characterized by.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a layout diagram showing substantially the entire rolling device. In the drawing, reference numerals 1 and 2 denote a roll stand before finishing, 3 denotes a final finishing roll stand, and a processing material 4 such as a bar or a wire rod passes through these roll stands to have a wire diameter of 20.5 mm to 5. The diameter is gradually reduced to 5 mm. Reference numerals 5, 6, and 7 denote inverter motors that rotationally drive the rolling rolls 1a, 2a, and 3a of the respective roll stands. Reference numeral 8 denotes a laser Doppler velocimeter provided on the entrance side of the roll stand 1 before finishing, 9 denotes a laser Doppler velocimeter provided between the roll stand 1 before finishing and the roll stand 2 before finishing, and 10 denotes a final finishing roll. This is a laser Doppler velocimeter provided on the exit side of the stand 3. Each of the laser Doppler velocimeters irradiates a laser beam to a moving object and measures the speed of the moving object in a non-contact manner using a frequency shift of light due to the Doppler effect, thereby extracting the speed from the roll stand 2. The speed of the processed material 4 can be measured with high accuracy.
[0006]
Further, 11 is a feed roll, 12 is a laying head, and the laying head draws the processing material 4 extracted from the roll stand in a loop onto a conveyor 13 to release the processing material by a focusing device 14. Let it be coiled.
[0007]
The speed information of the processing material 4 actually measured by the laser Doppler velocimeters 8, 9, and 10 is input to the controller 15, and the controller synchronizes the inverter motors 5 of the roll stands 1, 2, and 3 with each other. , 6, and 7, the rotation speed of each of the rolling rolls 1a, 2a, and 3a is controlled in accordance with the speed actually measured by each of the laser Doppler velocimeters. For this reason, the speed of the processing material 4 between the pre-finish roll stand 11 and the pre-finish roll stand 2 and the speed of the processing material 4 on the exit side of the final finishing roll stand 3 can always be appropriately controlled by information feedback.
[0008]
The speed information of the processing material 4 actually measured by each of the laser Doppler speedometers 8, 9, and 10 is also input to a water cooling device or a shear (not shown), and the water cooling start point and the water cooling end point of the processing material 4 And the cutting point can be commanded accurately from the actual speed.
[0009]
【The invention's effect】
As described above, the control method of the rolling device according to the present invention is applied to a rolling device that elongates to a small diameter by passing a processing material such as a bar and a wire through a multi-stage roll stand. A laser Doppler velocimeter is provided on the exit side, and the speed of the processing material inserted into and extracted from each roll stand is measured, and the rotation speed of the rolling roll of each roll stand is measured by the laser Doppler velocimeter. Therefore, accurate speed control is always possible even if the rolls are worn or the steel type of the processing material is changed, and there is a beneficial effect of improving the quality of bars and wires.
[Brief description of the drawings]
FIG. 1 is a layout view showing substantially the entirety of a rolling apparatus according to an embodiment of the present invention.
[Explanation of symbols]
1,2,3 Roll stand 1a, 2a, 3a Roll roll 4 Processing material 5,6,7 Inverter motor 8,9,10 Laser Doppler speedometer 15 Controller

Claims (1)

In a rolling device in which a processing material such as a rod and a wire is passed through a multi-stage roll stand, the rolling device extends to a small diameter. Measuring the speed of the processing material to be inserted and extracted into the roll, and controlling the rotation speed of the rolling roll of each roll stand according to the speed actually measured by the laser Doppler velocimeter. Control method of rolling device.

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