JPH1034207A - Method for controlling feeding billet for flying welding and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the accuracy of position for clamping a billet with a traveling truck for a welding machine which is moved in synchronism with a preceding billet by precisely bringing the tip of the succeeding billet close to the rear end of a preceding billet within a prescribed time. SOLUTION: The position of the rear end of the preceding billet is tracked based on the output of the device 12 for detecting the tip and rear end of a billet and the output of a pulse generator 33 and the traveling truck 10 for the welding machine is moved so as to make the position of the rear end of the preceding billet coincide with the welding point of the welding machine. When the ingress of the succeeding billet is detected based on the output of the 11 for detecting the tip and rear end of the billet, the succeeding billet is made to follow in the wake of the rear end of the preceding billet by controlling the transporting speed of a transporting table 21, whether the distance between the rear end of the preceding billet and the tip of the succeeding billet becomes less than a prescribed value or not is judged based on the output of a device 13 for detecting the distance between the billets and, when the distance is less than the prescribed value, the transporting speed of the transporting table 21 is synchronized with the transporting speed of the preceding billet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for controlling a billet feed for running welding in a continuous rolling plant for rolling a steel bar such as a bar, a wire and a section steel.

[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). Similarly, in a continuous rolling method in which a billet once extracted from a heating furnace is welded and connected to make it continuous, and the temperature is again raised in the same heating furnace, the billet becomes 1%.
Continuous rolling is performed using two traveling flash butt welding machines (for example, Japanese Patent Publication No. 57-11722).

[0003]

However, in the continuous rolling described above, no running welding is performed, and control for bringing the billet close to each other during the running is performed. Therefore, control accuracy was not required. For this reason, the conventional control technique could not be directly applied to the running welding as already proposed by the present applicant. That is, in running welding in which billets are sequentially welded successively, the leading end of the following billet needs to be accurately brought close to the trailing end of the preceding billet within a predetermined time. Since the accuracy of the clamp position largely depends on the accuracy, there has been a problem that high-accuracy billet transfer control and position control of the traveling cart of the welding machine are required.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem. The leading end of a subsequent billet is brought close to the trailing end of a preceding billet to be rolled accurately within a predetermined time period, and synchronized with the leading billet. It is an object of the present invention to provide a billet feed control method for traveling welding and an apparatus therefor, which enable the welding machine traveling vehicle to move and move to improve the accuracy of the position at which the billet is clamped.

[0005]

According to one aspect of the present invention, a billet feed control method for traveling welding includes detecting a rear end of a preceding billet in a welding machine traveling carriage on which a welding machine is mounted. A step of tracking the rear end position of the preceding billet by detecting the transfer speed of the preceding billet, and after detecting the rear end of the preceding billet, the welding machine traveling truck is run to determine the welding point of the welding machine. A step of following the trailing end position of the preceding billet, a step of detecting the leading end of the trailing billet on the side of the transport table arranged on the upstream side of the welding machine traveling vehicle, and detecting the leading end of the trailing billet, Following the trailing edge of the preceding billet while reducing the transport speed of the transport table to reduce the transport speed of the following billet; If the distance is below a predetermined value by measuring the distance between the tip, and a step of synchronizing the conveying speed of the conveying table to the transport speed of the preceding billet. In this synchronized state, flash butt welding is performed while the rear end of the preceding billet and the front end of the following billet are clamped and run. In the billet feed control method for traveling welding according to another aspect of the present invention, in the above control method, the distance between the rear end of the preceding billet and the front end of the following billet is equal to or less than a predetermined value. In case,
The leading billet has already been bitten by the rolling stand. In this state, after the trailing end of the leading billet and the leading end of the trailing billet are clamped by the clamp of the welding machine, control of the transport table is performed. Stop output and change to free roller.

[0006] A billet feed control device for traveling welding according to the present invention comprises: a transfer table for transferring the billet;
A welding machine traveling cart provided between the transport table and the rolling stand, on which the welding machine is mounted, a first billet detector provided downstream of the transport table and detecting a tip of a following billet; A second billet detector attached to the machine traveling trolley for detecting the rear end of the preceding billet, and a distance between the rear end of the preceding billet and the tip of the following billet attached to the welding machine traveling trolley. A billet distance detector, a billet speed detector for detecting a transfer speed of a preceding billet engaged in a rolling stand, a first billet detector, a second billet detector, a billet distance detector, and a billet Input each output of the speed detector,
Tracking the trailing edge position of the preceding billet based on the output of the billet detector and the output of the billet speed detector,
The welding machine traveling cart is moved so that the rear end position of the preceding billet coincides with the welding point of the welding machine, and when the entry of the following billet is detected based on the output of the first billet detector, By controlling the transport speed, the following billet follows the trailing edge of the preceding billet, and the distance between the trailing edge of the preceding billet and the leading edge of the following billet becomes equal to or less than a predetermined value based on the output of the distance detector between billets. And a drive control device for determining whether or not the transfer speed has reached a predetermined value or less, and synchronizing the transfer speed of the transfer table with the transfer speed of the preceding billet when the transfer speed becomes equal to or less than a predetermined value. In this synchronized state, the drive control device causes the welding machine to perform flash butt welding while running while clamping the rear end of the preceding billet and the front end of the following billet. In a billet feed control device for traveling welding according to another aspect of the present invention,
When the distance between the rear end of the preceding billet and the front end of the following billet becomes equal to or less than a predetermined value, the preceding billet has already been bitten by the rolling stand. In this state, after the rear end of the preceding billet and the front end of the following billet are clamped by the clamp of the welding machine, the control output of the transport table is stopped to make the roller free.

In the present invention, after detecting the rear end of the preceding billet, its position is tracked, and the welding point of the traveling carriage of the welding machine follows the rear end of the preceding billet.
Further, when the leading end of the following billet is detected on the transport table side, the trailing end of the preceding billet is made to follow. In a state in which the leading end of the following billet is close to the trailing end of the preceding billet, the distance between the trailing end of the preceding billet and the leading end of the following billet is measured, and when the distance becomes equal to or less than a predetermined value, the transport is performed. A flash butt welding is performed while the transport speed of the table is synchronized with the transport speed of the preceding billet, and the trailing end of the preceding billet and the leading end of the following billet are clamped and run. By the way, in the above, when the distance between the rear end of the preceding billet and the front end of the following billet becomes equal to or smaller than a predetermined value, the preceding billet is already in a state of being bitten by the rolling stand. In such a state, after the rear end portion of the preceding billet and the front end portion of the following billet are clamped, the control output of the transport table is stopped and the free roller is formed.

[0008]

FIG. 1 is a block diagram showing an arrangement of a billet feed control device and related equipment according to an embodiment of the present invention. The welding machine traveling trolley 10 is equipped with a billet leading and trailing end detector 12, a billet distance measuring detector 13 and a pulse transmitter 33, each of which has a flash butt welding machine (not shown). And The welding machine traveling cart 10 is waiting at a predetermined position between the transfer table 21 and the rolling stand 41 as shown in the figure. A transfer table 21 disposed upstream of the welding machine standby position of the welding machine traveling cart 10
A billet leading and trailing end detector 11 is disposed at the downstream end of the billet. Also, a measuring roll 31 is disposed downstream of the welding machine standby position of the welding machine traveling vehicle 10,
A pulse transmitter 32 is connected to the measuring roll 31. Outputs from the billet leading and trailing end detectors 11 and 12, the billet distance measuring detector 13 and the pulse transmitters 32 and 33 are input to the drive controller 51, and after performing predetermined arithmetic processing, the welding machine travels. The traveling and position of the carriage 10 and the transport table 21 are controlled.

FIG. 2 is an explanatory diagram showing the operation of the apparatus shown in FIG. 1 in time series, and FIG. 3 is a flowchart showing the processing steps when the drive control unit 51 controls the welding machine traveling vehicle 10. The control of the welding machine traveling vehicle 10 will be described based on these drawings. In this control, the position of the welding machine traveling vehicle 10 is controlled such that the welding point of the flash butt welding machine follows the rear end of the preceding billet. (1) After the preceding billet is carried in (S1), the pulses of the pulse transmitter 32 attached to the measuring roll 31 are counted (S2), and the count value is subjected to arithmetic processing, whereby the rolling mill is operated. 41, the moving speed of the preceding billet being bitten and conveyed is determined (S
3). It is also possible to use a non-contact speed detector instead of the measure roll 31. (2) In the initial state where the welding machine traveling vehicle 10 is stopped at the standby position (see FIG. 2A), the welding machine traveling vehicle 1
When the billet leading and trailing end detector 12 mounted on 0 detects the trailing end of the preceding billet (S4), the trailing end position of the billet is tracked by performing an arithmetic process based on the above-mentioned preceding billet transfer speed ( S5).

(3) Further, an acceleration start time for accelerating the welding machine traveling carriage 10 to the conveying speed of the preceding billet and following the same is obtained (S6). The acceleration start time is set to a timing at which the rear end of the preceding billet coincides with the welding point when the acceleration of the welding machine traveling vehicle 10 is completed (at a predetermined acceleration and acceleration time). It is obtained from the transfer speed and the detection time of the trailing end of the preceding billet. Then, when it is time to start the acceleration, the acceleration control of the welding machine traveling vehicle 10 is started (S7). This state is as shown in FIG. (4) When the billet distance measurement detector 13 mounted on the welding machine traveling cart 10 detects the rear end of the preceding billet (S)
8) Next, it is determined whether or not the acceleration of the welding machine traveling vehicle 10 has been completed based on whether or not a predetermined acceleration time has elapsed (S9). When the acceleration is completed, the position of the rear end of the preceding billet is detected by the distance measuring detector 13 between billets, the position of the welding machine traveling carriage 10 is controlled, the position is corrected, and the billet is followed (S10) ( FIG. 2 (C)
reference). When the deviation between the welding point and the position of the rear end of the preceding billet exceeds a predetermined value, the welding machine traveling vehicle is accelerated / decelerated to correct the position. The welding machine traveling vehicle 10 travels while correcting the position until the end of a clamp described later.

FIG. 4 shows that the drive control device 51 is connected to the transfer table 2.
2 is a flowchart showing a processing procedure when controlling the control of the first embodiment. The control of the transport table 21 will be described with reference to FIGS. (1) When the front end detector 11 detects the leading end of the following billet that is conveyed at a high speed and enters (S1)
1, S12), the speed is reduced to the speed for following the preceding billet (S13). (2) When the welding machine traveling vehicle 10 starts moving, the trailing end position of the preceding bit is tracked as described above (S5), and in this state, the billet leading and trailing end mounted on the welding machine traveling vehicle 10 When the detector 12 detects the leading end of the subsequent billet (S14), the detector 12 determines the rear end position of the preceding billet and the transport speed of the transport table 21 for transporting the subsequent billet.
A deceleration start time for reducing the transfer speed of the following billet to a low speed, that is, for reducing the drive speed of the transport table 21 is obtained (S15). The deceleration start time is also a timing at which the leading end of the following billet catches up with the trailing end of the preceding billet at the time when the deceleration of the transport table 21 is completed (at a predetermined deceleration and deceleration time). It is determined from the transfer speed and the trailing end position (tracking) of the preceding billet. When the deceleration start time comes, deceleration control of the transport table 21 is started (S1).
6).

(3) The timing at which the distance between the rear end of the preceding billet and the front end of the following billet is detected by the inter-billet distance measuring detector 13 and that the distance is detected to be equal to or less than the predetermined value X. (S17), the transport speed of the transport table 21 is synchronized with the transport speed of the preceding billet detected by the pulse transmitter 32 of the measuring roll 31 (S18). (4) Next, a clamp start command is output to the flash butt welding machine mounted on the welding machine traveling trolley 10, and when the clamping is completed, the control of the transfer table 21 is stopped and the free roller is set (S19). . Therefore, the preceding billet and the following billet are drawn in at the rolling speed of the rolling stand 41. At this time, the welding machine traveling vehicle 10
The flash butt welding is carried out by the flash butt welding machine mounted on the welding machine traveling carriage 10 while moving in synchronization with the billet transfer speed while clamping the preceding billet and the following billet.

As a method of causing the following billet to follow the trailing end of the preceding billet according to the present invention, the trailing end position of the preceding bit is tracked in the above-described embodiment.
Although the example in which the tip of the following billet directly follows the following billet has been described, the pulse of the pulse transmitter 33 mounted on the welding machine traveling vehicle 21 is counted, the welding point of the welding machine is tracked, and the billet of the following billet is counted. The tip may follow it (the welding point). The detector 13 for measuring the distance between billets uses a method of detecting a billet existing in a certain range by scanning a laser beam. However, a method of detecting an end face of the billet by image processing may be used.

[0014]

As described above, according to the present invention, after detecting the rear end of the preceding billet, the position is tracked,
In the state where the welding point of the traveling carriage of the welding machine follows the rear end of the preceding billet, and the leading end of the following billet follows the trailing end of the preceding billet, and the leading end of the following billet approaches the rear end of the preceding billet Since the distance between the rear end of the preceding billet and the front end of the following billet is measured and the distance becomes equal to or less than a predetermined value, the transport speed of the transport table is synchronized with the transport speed of the preceding billet. The leading end of the following billet can be accurately brought close to the trailing end of the preceding billet within a predetermined time, improving the accuracy of the clamping position of the power supply section for welding, contributing to stable welding conditions and uniform products. .

[Brief description of the drawings]

FIG. 1 is a block diagram showing an arrangement of a billet feed control device and related equipment according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the operation of the apparatus of FIG. 1 in a time series.

FIG. 3 is a flowchart showing a processing procedure when the drive control device of FIG. 1 controls a welding machine traveling vehicle.

FIG. 4 is a flowchart showing a processing procedure when the drive control device of FIG. 1 controls the transport table.

Claims (4)

[Claims] A step of detecting a rear end of the preceding billet by detecting a rear end of the preceding billet on a welding machine traveling vehicle on which the welding machine is mounted and detecting a transfer speed of the preceding billet; After detecting the rear end of the preceding billet, a step of running the welding machine traveling vehicle to cause the welding point of the welding machine to follow the rear end position of the preceding billet, and disposed on the upstream side of the welding machine traveling vehicle. Detecting the leading end of the following billet on the side of the carrying table, and when the leading end of the following billet is detected, while reducing the carrying speed of the carrying table to reduce the transfer speed of the following billet. Following the trailing end of the preceding billet, measuring the distance between the trailing end of the preceding billet and the leading end of the following billet and determining the distance If it becomes less, the billet feed control method for an inter-running welding, characterized in that it comprises a step of synchronizing the conveying speed of the conveying table in transport speed of the preceding billet. 2. When the distance between the rear end of the preceding billet and the front end of the following billet becomes a predetermined value or less, the rear end of the preceding billet and the front end of the following billet are welded. 2. The billet feed control method for traveling welding according to claim 1, wherein the control output of the transfer table is stopped after the clamp by the clamp of the machine to make the roller a free roller. 3. A transport table for transporting a billet, a welding machine traveling truck disposed between the transport table and a rolling stand, and having a welding machine mounted thereon, provided downstream of the transport table, A first billet detector for detecting a leading end of a billet; a second billet detector attached to the welding machine traveling vehicle and detecting a rear end of a preceding billet; and a second billet detector attached to the welding machine traveling vehicle. A billet distance detector that measures the distance between the rear end of the billet and the front end of the following billet, and a billet speed detector that detects the transfer speed of the preceding billet that has been bitten by the rolling stand. Each of the outputs of the first billet detector, the second billet detector, the distance between billets detector, and the billet speed detector is input, and the second billet detection is performed. The trailing end position of the preceding billet is tracked based on the output of the welding machine and the output of the billet speed detector, and the welding machine traveling bogie is adjusted so that the trailing end position of the preceding billet coincides with the welding point of the welding machine. Moving, when detecting the entry of the following billet based on the output of the first billet detector, controls the transport speed of the transport table to cause the following billet to follow the trailing end of the preceding billet; Then, it is determined whether or not the distance between the rear end of the preceding billet and the front end of the following billet is smaller than a predetermined value based on the output of the inter-billet distance detector. And a drive control unit for synchronizing the transfer speed of the transfer table with the transfer speed of the preceding billet. 4. When the distance between the rear end of the preceding billet and the front end of the succeeding billet becomes equal to or less than a predetermined value, the drive control device controls the rear end of the preceding billet and the following billet. 4. The billet feed control device for traveling welding according to claim 3, wherein the control output of the transfer table is stopped to form a free roller after the tip is clamped by the clamp of the welding machine. .