JPH10192902A - Intermill welding type continuous rolling method and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the time cycle of billet processing by enabling continuous rolling regardless of billet size and length of an intermediate material. SOLUTION: Plural materials are rolled with an upstream stand 10 and, while pinching the succeeding material after that rolling with a pinch roll 21, by adjusting the driving speed of at least the pinch roll 21 so that the tip of the succeeding material is joined with the rear end of a preceding material in a prescribed position of a traveling welder 24, the transporting speed of the succeeding material is controlled. After joining the tip of the succeeding material with the rear end of the preceding material, as moving the traveling welder 26 while synchronizing it with the transporting speed of the material, the rear end of the preceding material and tip of the succeeding material are connected by flash butt welding with the traveling welder 24 and a continued material is formed. After executing grinding for removing burrs in the weld zone, furthermore, the continued material is continuously rolled with a downstream stand 11 which is arranged on the downstream side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous rolling method between rolling mills, in which rolling is performed from a billet in several passes, and then a rolled material is welded and connected in the middle of a rolling line.

[0002]

2. Description of the Related Art In a conventional continuous rolling method for producing wires, steel bars, shaped steels, etc. with energy saving and high efficiency, billets are extracted one by one from a heating furnace, and one traveling type is prepared. The rear end of the preceding billet and the front end of the following billet are welded by a flash butt welding machine, and then burrs at the weld are removed with a scarfer or the like, and the continuous billet is heated to a temperature required for rolling by an induction heating device. And then continuously rolling in a rolling mill train (for example, JP-A-52-43754). Also, in the continuous rolling method in which the billet once extracted from the heating furnace is welded and connected and then continuously heated again in the same heating furnace, continuous rolling is similarly performed using one traveling flash butt welding machine. (For example, Japanese Patent Publication No. 57-11722).

[0003]

In continuous rolling of billets performed by welding the billets at the entrance of a rolling mill, it is important to shorten the processing time cycle of one billet. The weight per billet used is 0.5 to 2 tons, and
In order to increase production capacity from 0 to 80 tons / hr or more, 1
The processing time cycle of a book billet must be less than 1 minute. However, in the conventional continuous rolling method, since only one traveling welding machine is arranged online, it is difficult to shorten the welding time inherent in the traveling welding machine. It was impossible to achieve a time cycle. For this reason, after the billet is rolled in a predetermined number of rolling mill rows to reduce the cross-sectional area, the intermediate rolled material is temporarily set in a free state, the position of the intermediate material is adjusted, and the welding connection is performed. Although it is conceivable to shorten the welding time by performing this method, however, this method has a drawback in that when the intermediate material becomes long, it may not be able to be used due to the distance between stands.

SUMMARY OF THE INVENTION The present invention has been made to solve such problems, and enables continuous rolling irrespective of billet size and intermediate material length to shorten the time cycle of billet processing. It is an object of the present invention to provide a continuous rolling method between rolling mills and an apparatus therefor.

[0005]

SUMMARY OF THE INVENTION According to one aspect of the present invention, there is provided a continuous rolling method between rolling mills, in which a plurality of materials are sequentially rolled in a first rolling mill row, and after rolling, A step of detecting the transfer speed of the material and the position of the front end thereof while pinching the material of the line by the pinch roll, and detecting the transfer speed of the preceding material and the rear end position thereof; Controlling the transfer speed of the succeeding material by adjusting at least the rotation speed of the pinch roll so as to join the rear end of the preceding material at a predetermined position of the welding machine; After joining with the rear end of the preceding material, flash butt welding the rear end of the preceding material and the front end of the following material using the traveling welding machine while moving the traveling welding machine in synchronization with the transfer of the material. To connect continuous material And a step of forming, and the grinding step of removing the burrs of the weld, and a step of burr continuous material that has been removed, is continuously rolled by the second rolling mill train, further arranged downstream.

A continuous rolling mill between rolling mills according to another aspect of the present invention includes a first rolling mill row for sequentially rolling a plurality of materials, and after the rolling, pinching and pinching of a succeeding material. A pinch roll that detects the transfer speed of the material that has been transferred, a tip detector that is provided at the entrance of the pinch roll, and detects the leading end of the material that follows, and a measuring device that detects the transfer speed of the material preceding the material that follows. Roll, a rear end detector provided at the entrance of the measuring roll and detecting the rear end of the preceding material, and a downstream end detector provided at the downstream side of the measuring roll and moving in synchronization with the transfer of the material, From a traveling welding machine that connects the rear end of the material and the leading end of the succeeding material by flash butt welding to produce a continuous material, a traveling grinding machine that removes burrs at the weld, and a traveling grinding machine Located downstream, The second rolling mill row which continuously rolls the removed continuous material, and the signals from the pinch roll, the leading edge detector, the measuring roll and the trailing edge detector are input respectively, and the leading edge of the succeeding material is Obtain and control the rotation speed of the pinch roll, or the rotation speed of the pinch roll and the rolling speed of the first rolling mill row, so as to join the rear end of the preceding material at a predetermined position of the traveling welding machine. A drive control device, and a pinch roll, a measuring roll, a traveling welding machine, a traveling grinding machine, and a second rolling mill row are arranged in series on a pass line. The continuous rolling mill between rolling mills according to another aspect of the present invention, in the above-described apparatus, is disposed at the outlet of the first rolling mill row, the tip of the material that came out of the first rolling mill row and It further has a front-rear end detector for detecting the rear end, and means for crop-cutting while being moved between the front-rear end detector and the pinch roll and running on the front and rear ends of the material. A continuous rolling mill between rolling mills according to another aspect of the present invention is the above-described apparatus, further including a traveling induction heating device arranged at an entrance of the second rolling mill row.

In the present invention, while pinching a subsequent material rolled out of the first rolling mill row by a pinch roll, the transfer speed of the material and the tip position thereof are detected, and the preceding material is detected. And the leading edge of the following material is joined with the trailing edge of the preceding material at a predetermined position of the traveling welding machine.
Controls the transfer speed of the following material. The transfer speed of the succeeding material is determined based on the current transfer speed and the leading end position of the succeeding material, the transfer speed of the preceding material, and the trailing end position. The transfer speed of the succeeding material is controlled by adjusting the driving speed of the pinch roll or the pinch roll and the first rolling mill row.

In the present invention, by controlling the transfer speed of the succeeding material in this way, there is no obstacle even if the succeeding material rolled out from the first rolling mill row is long. The material having a reduced cross-sectional area is flash butt-welded by a traveling welding machine, the materials after rolling are connected to form a continuous material, and the continuous material is continuously processed by a second rolling mill row on the downstream side. , So that the welding time can be shortened and a short cycle can be accommodated.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a layout diagram showing a configuration of a continuous rolling mill between rolling mills according to an embodiment of the present invention. In the drawing, the upstream stand 10 of the rolling mill train
Although the downstream stand 11 is illustrated, the first stand to the upstream stand 10 not illustrated are assumed to constitute, for example, a rough roll example. Upstream stand 1
At the exit of No. 0, the running cutting machine 20 is arranged first. A pin roll 21 whose drive speed can be controlled is disposed downstream thereof, and a measuring roll 2 is further downstream thereof.
2. A descaler 23, a traveling flash butt welding machine (hereinafter referred to as traveling welding machine) 24, and a traveling grinding machine (burr removing machine) 25 are arranged in series. Further, a traveling induction heating device 26 is disposed at the entrance of the downstream stand 11. In this embodiment, since the distance between the stands is short and the temperature drop of the material is small, a fixed induction heating device for raising the entire temperature is not provided.

A material detector 3 is provided at each of the entrances of the running cutter 20, the pinch roll 21 and the measuring roll 22.
0, 31, and 32 are arranged. The detector 30 detects the leading end and the trailing end of the material, respectively, and the detection signals are used for controlling the running cutter 20. The detector 31 detects the front end of the material, and the detector 32 detects the rear end of the material.
The drive control device 40 receives detection signals from the detector 32, the rotary encoder 42 attached to the drive motor 41 driving the pinch roll 21, and the rotary encoder 43 attached to the measuring roll 22, respectively. Then, the drive motor 44 of the upstream stand 10 and the drive motor 41 of the pinch roll 21 are controlled based on the detection signal. The drive control unit 45 receives the detection signal from the detector 30 and controls the running cutting machine 20.

Next, the operation of the apparatus shown in FIG. 1 will be described. First, the material rolled out by the upstream stand 10 is detected at the tip thereof by the detector 30, and the drive control device 45 drives the travel cutting machine 20 based on the detection signal, and 20 cuts the tip of the material. When the detector 30 detects the trailing end of the material, the running cutter 20 is similarly driven and controlled to crop the trailing end of the material. The cutting at this time is performed in order to obtain a property suitable for the subsequent flash butt welding (FBW) (there is no excessive crushing). Therefore, the running cutting machine 20 can minimize the crushing of the material. It must be a cutting machine. For this purpose, a running heat saw may be used. The material whose tip is crop-cut by the running cutter 20 is then moved to the detector 31.
, The pinch roll 21 pinches the rear part slightly from the front end. At this time, the exit speed of the upstream stand 10 of the material is adjusted to the downstream stand 11 of the continuous rolled material.
The speed of the pinch roll 21 is set to be slightly higher than the inlet speed (measured by the rotary encoder 43 of the measuring roll 22), and the pinch roll 21 is also driven to rotate in synchronization with this speed.

After the succeeding material is pinched by the pinch roll 21, the transfer speed and the leading end position of the succeeding material are detected from the pinch roll 21. That is, the material transfer speed is detected by the rotary echoer 42 and the leading end is detected by the detector 31 and is tracked by the drive control device 40, as described above. Is detected. The speed of the preceding material is detected by the rotary encoder 43 of the measuring roll 22, and the rear end position is detected by the detector 32 and tracked by the drive control device 40 for the rear end position. Detect the transfer speed and tip position. The drive control device 40 performs the following operation at the target point in front of the traveling welding machine 24 based on the relative relationship between the transfer speed and the front end position of the subsequent material and the transfer speed and the rear end position of the preceding material. The transport speed of the upstream material is calculated so that the front end of the material and the rear end of the preceding material are joined, and the rotation speed of the drive motor 44 of the upstream stand 10 and the drive motor 41 of the pinch roll 21 is controlled. .

By such control, the rear end of the preceding material and the starting end of the following material come into contact at the target position,
The drive control device 40 detects the contact based on an increase in the torque of the pinch roll 21 (an increase in the drive current) or a thrust force applied to the pinch roll 21 to the upstream side, and determines the upstream transfer speed (rolling speed) downstream. Control to synchronize with the rolling speed on the side. In this way, when the preceding and succeeding materials that are in front and rear contact with each other and whose speed is synchronized reach the home position of the traveling welding machine 24, the traveling welding machine 24 starts welding while traveling synchronously with the material. In addition, this traveling type welding machine 2
The descaler 23 disposed at the entrance 4 performs descaling of the clamp portions at the front and rear ends of the transferred material. A traveling grinder 25 is disposed at the end of the traveling end of the traveling welding machine 24. The traveling grinding machine 25 removes burrs of a weld portion of the material welded by the traveling welding machine 24 during traveling. Do it. The material welded by the traveling welding machine 24 is cooled at the portion clamped during the welding, but the induction heating device 26 arranged at the entrance of the downstream stand 11 raises the temperature of the local cooling. To the downstream stand 11.

In the above welding process, the transfer speed of the succeeding material is controlled so as to change with respect to the transfer speed of the preceding material in accordance with the welding conditions at the time of flashing and at the time of upsetting. This control is performed by controlling an upset cylinder built in the traveling welding machine 24. The speed control of the material on the upstream side (subsequent) corresponding to this control differs depending on the billet size, the intermediate material size, the distance from the welding machine to the upstream stand, and the like.

1) Before the start of welding, when the trailing end of the succeeding material passes through the upstream stand 10 and becomes free (in a state where the rear end of the material has passed through the upstream stand 10 and is not clamped to the traveling welding 24). Releases the pinch roll 21 after the subsequent material is clamped by the welding machine. That is, in this case, the length of the intermediate material that has exited from the upstream stand 10 is short, and is controlled in the same manner as in the conventional case. 2) When the cross section of the intermediate material is relatively small and the length is long (5
0 ^{□ to} 100 ^□ ) Speed fluctuations are absorbed by the material loop between the upstream stand 10 and the pinch roll 21. The speed fluctuations in this case are so small that the material loop height is very low (50
１００100 mm), a material loop can be formed without difficulty if there is a certain distance or more. 3) When the cross section of the intermediate material is large and long It is difficult to form a material loop. Therefore, the speed of the upstream stand 10 and the pinch roll 21 is integrally controlled. In this case, since the fluctuation cycle is about several Hz, it is possible to sufficiently cope with the conventional tension control.

[0016]

As described above, according to the present invention, while pinching the succeeding material coming out of the first rolling mill row by the pinch roll, the transfer speed of the material and the tip position thereof are detected. Detecting the transfer speed and trailing edge position of the preceding material, and pinching a pinch roll or pinch so that the leading edge of the trailing material joins the trailing edge of the preceding material at a predetermined position in the traveling welder. By adjusting the drive speed of the roll and the first rolling mill row, the subsequent material transfer speed is controlled, and the rolled material having a reduced cross-sectional area is continuously welded by a traveling welding machine. Since the material is produced, the welding time can be shortened, the rolling can be continuously performed irrespective of the billet size and the length of the intermediate material, and the time cycle of billet processing can be shortened. Further, since the present invention is not limited to the billet size, the present invention can be applied to a rolling mill in which the distance between stands is relatively short.

[Brief description of the drawings]

FIG. 1 is a layout view showing a configuration of a continuous rolling mill between rolling mills according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Upstream side stand 11 Downstream side stand 20 Inter-cutting machine 21 Pinch roll 22 Measuring roll 23 Descaler 24 Travel type welding machine 25 Travel type grinding machine 26 Travel type induction heating device 40 Drive control device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B23K 11/04 510 B23K 11/04 510

Claims (4)

[Claims] 1. A step of sequentially rolling a plurality of materials in a first rolling mill row, and detecting a transfer speed of the materials and a tip position thereof while pinching a succeeding material after the rolling by a pinch roll. And detecting the transfer speed and the trailing end position of the preceding material; and at least so that the leading end of the trailing material is joined to the trailing end of the preceding material at a predetermined position of the traveling welding machine. Controlling the transfer speed of the following material by adjusting the rotation speed of the pinch roll; and after the leading end of the following material is joined to the trailing end of the preceding material, the traveling welding machine Generating a continuous material by connecting the trailing end of the preceding material and the leading end of the succeeding material by flash butt welding by the traveling welding machine while moving the material in synchronization with the transfer speed of the material. When ,
A rolling step, comprising: a grinding step of removing burrs at the welded portion; and a step of continuously rolling a continuous material from which burrs have been removed by a second rolling mill row disposed further downstream. Cold welding continuous rolling method. 2. A first rolling mill row for sequentially rolling a plurality of materials, a pinch roll for pinching a succeeding material after the rolling and detecting a transfer speed of the pinched material, A leading end detector provided at an entrance, for detecting a leading end of the following material; a measuring roll for detecting a transfer speed of a preceding material being transferred earlier than the following material; and the measuring roll. A rear end detector provided at the entrance of the preceding material and detecting a rear end of the preceding material, provided downstream of the measuring roll, and moving in synchronization with the transfer of the material, A traveling welding machine that connects a rear end and the leading end of the following material by flash butt welding to generate a continuous material, a traveling grinding machine that removes burrs at the welded portion, and a traveling grinding machine. Downstream And a second rolling mill row for continuously rolling the continuous material from which burrs have been removed, and inputting signals from the pinch roll, the leading edge detector, the measuring roll, and the trailing edge detector. The rotation speed of the pinch roll, or the rotation speed of the pinch roll, such that the leading end of the following material joins the trailing end of the preceding material at a predetermined position of the traveling welding machine. A drive control device for determining and controlling the rolling speed of the rolling mill row, wherein the pinch roll, the measuring roll, the traveling welding machine, the traveling grinding machine, and the second rolling mill row are A continuous rolling mill between rolling mills, which is arranged in series. 3. An arrangement at the outlet of said first rolling mill row,
A leading and trailing end detector for detecting a leading and trailing end of the material coming out of the first rolling mill row, respectively, disposed between the leading and trailing end detector and the pinch roll, and leading and trailing ends of the material. 3. A means for crop cutting while traveling on the road.
The continuous rolling mill between the rolling mills according to the above. 4. The continuous rolling mill between rolling mills according to claim 2, further comprising a traveling induction heating device arranged at an entrance of said second rolling mill row.