JP2001259926A - Method for cutting bar and gauge stopper facility used therein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve efficiency in operation of a cutting line and to provide exact cutting length of bar steel. SOLUTION: When a tip of bar 2 conveyed on a conveying path 1 practically abuts to a stopper 4 moved and placed at a specified position on the conveying path 1, a vibration meter 8 detects the abutment and clamp of the bar 2 by a clamping device 5 is started at the timing of detection with driving the conveying path 1. When the clamp is completed, drive of the conveying path 1 is stopped and the bar 2 is cut to be specified length by a cutting device under this condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel strip having a predetermined length in a state in which the end of the strip such as an H-section steel or a sheet pile is brought into contact with a stopper arranged on a transfer table for the strip. The present invention relates to a method for cutting into pieces and a gauge stopper facility used in the method.

[0002]

2. Description of the Related Art As a method for cutting a strip such as an H-section steel or a steel sheet pile into a predetermined length, for example, a strip transferred on a transfer table is moved to a predetermined position on a transfer table by a stopper. When approaching, the transport speed of the transport table is controlled to be reduced, then the strip is transported at a constant speed, and the strip is clamped by a clamp device in a state where the tip of the strip is in contact with the stopper, and the transport table is moved. The drive is stopped, and in this state, the strip is cut to a predetermined length by the cutting device.

[0003] In this case, the timing at which the transport speed of the transport table is reduced and the timing at which the leading end of the strip reaches the stopper are determined by counting the position of the strip using a measuring roll installed directly in contact with the strip. It is detected by comparing the result of tracking the tip of the head with the preset position information, but the tracking measurement caused by the type of the cross-sectional shape of the strip or the change in the contact state of the measuring roll with the strip, etc. It is difficult to accurately detect the moment when the tip of the strip actually reaches the stopper due to a long error, and there are also problems such as the tip of the strip colliding with the stopper and rebounding.

[0004] Under such circumstances, conventionally, FIG.
As shown in (b), at the timing when it is detected that the tip of the strip has reached the stopper, the drive of the transport table is controlled so that the strip is transported at a low speed for a predetermined time α. Judging that the tip is pressed against the stopper, the clamping of the strip is started, the driving of the transport table is stopped, and after the clamping is completed, the strip is cut to a predetermined length by the cutting device. .

[0005]

However, in the above-mentioned conventional method for cutting a strip, the strip is conveyed at a very low speed for a predetermined time α at the timing when it is detected that the tip of the strip has reached the stopper. Since the clamping of the strip is started from the beginning, the cutting cycle is extended by the time α for transporting the strip at a very low speed, and as a result, there is a disadvantage that the operating efficiency of the cutting line is reduced.

Further, it is determined that the tip of the strip is pressed against the stopper by transporting the strip at a slow speed for a predetermined time α. However, since this determination is presumed, even if the strip is clamped, It is unknown whether the end of the strip is actually pressed against the stopper. Therefore, there is an inconvenience that when the strip is cut by the cutting device after the clamping is completed, a length defect occurs.

The present invention has been made in order to solve such inconveniences, and it is possible to improve the operating efficiency of a cutting line and to obtain a strip material with an accurate cutting length. And a gauge stopper device used in the method.

[0008]

According to a first aspect of the present invention, there is provided a method of cutting a strip material, wherein a tip of a strip material conveyed on a conveyance path is moved to a predetermined position on the conveyance path. To detect the actual contact, and start the clamping of the strip while driving the conveyance path at the detection timing, and stop the driving of the conveyance path when the clamping is completed. It is characterized in that the strip material is cut to a predetermined length by the method.

A method for cutting a strip according to a second aspect is characterized in that, in the first aspect, a vibrometer is used as means for detecting that the tip end of the strip has actually contacted the stopper. I do. The gauge stopper according to claim 3 is arranged so as to be movable in the transport direction of the transport path for transporting the strip, and is disposed so as to be able to approach and separate on the transport path so that the tip of the strip is applied when approaching. A gauge stopper device provided with a stopper that comes into contact with a stopper, wherein a vibrometer that detects that the tip of the strip material has contacted the stopper is provided.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view for explaining a method of cutting a strip which is an example of an embodiment of the present invention, FIG. 2 is a control block diagram of the method of cutting a strip, FIG. 3 is a table speed, time and start of clamping. FIG. 6 is a time chart showing a relationship with completion timing. In this embodiment, a case in which the present invention is applied to hot cutting equipment after rolling in a section steel mill is taken as an example.

In FIGS. 1 and 2, reference numeral 1 denotes a transport table (transport path) for transporting a steel bar (strip) 2, and 3 denotes a plurality of stoppers 4 to which the ends of the steel bar 2 transported on the transport table 1 abut. The gauge stopper equipment provided, 5 is a clamping device for clamping the side of the bar 2, 6 is a hot saw (cutting device) for cutting the bar 2 to a predetermined length, 7 is the bar 2
A measuring roll 8 that contacts the side of the bar 2 and tracks the tip of the bar 2 is attached to a slide table 9 of the gauge stopper equipment 3 to detect vibration when the tip of the bar 2 comes into contact with the stopper 4. A vibrometer 10, a table roller driving device for driving the table roller 11 of the transport table 1, a gauge stopper driving device 12 for driving the stopper 4 and the slide table 9 of the gauge stopper device 3, and a driving device 13 for opening and closing the clamp device 5 A clamp driving device, 14 is a hot saw driving device for driving the hot saw 6, 15 is a table roller driving device 10, a gauge stopper driving device 12, a clamp driving device according to the output from the host computer 16, the measuring ring roll 7, and the vibrometer 8. 13 and a controller that controls the hot saw drive device 14 That.

The measuring roll 7 moves into the transport line at the timing when the tip of the bar 2 has passed a position detection sensor (not shown) installed immediately upstream of the measuring roll 7 and moves to the conveying line. , Thereby driving a pulse transmitter 17 which performs position counting. The pulse transmitter 17 starts tracking the tip position of the bar 2 from the reference point, and outputs the signal to the controller 15.

The host computer 16 selects the stopper 4 of the gauge stopper device 3 according to the sawing length of the bar 2 and the position of the slide table 9, the transfer speed of the transfer table 1, the deceleration timing, the deceleration rate, and the clamp device. The opening degree in the standby state of No. 5 is set, and each set value is output to the controller 15. Next, the operation of the controller 15 will be described with reference to FIGS. 2 and 3A.

First, at the timing when the bar 2 enters the transport table 1, the table roller driving device 10 is controlled to drive the transport table 1 at a predetermined speed in accordance with each set value from the host computer, and the bar 2 is driven. At the same time, the slide stopper 9 of the gauge stopper device 3 is moved to a predetermined position by controlling the gauge stopper driving device 12, and the selected stopper 4 is lowered and placed on the transfer table 1, Further, the clamp drive device 13 is controlled to bring the clamp device 5 into a standby state at a predetermined opening.

Next, when the set value of the deceleration timing given from the host computer 16 matches the tracking data of the leading end of the bar 2 by the measuring roll 7, the impact when the leading end of the bar 2 collides with the stopper 4 is determined. In order to ease the speed, the table roller driving device 10 is decelerated at a predetermined deceleration rate to decelerate the transport table 1. Next, when the end of the bar 2 reaches the vicinity of the stopper 4, the output from the vibrometer 8 is read, and when the output value exceeds a preset value, the clamp driving device 13 is controlled. The clamping of the bar 2 is started. At this time, the transport of the bar 2 by the transport table 1 is continued.

Next, when the clamping of the strip 2 by the clamping device 5 is completed, the table roller driving device 10 is controlled to stop the operation of the transport table 1 which has been continued,
After that, the hot saw driving device 14 is controlled to start cutting the steel bar 2 by the hot saw 6. After the cutting of the bar 2 by the hot saw 6 is completed, the gauge stopper driving device 12 is controlled to raise the stopper 4, and in this state, the table roller driving device 10 is controlled to restart the operation of the transport table 1, Discharge the cut bar products.

As is apparent from the above description, in this embodiment, the vibrometer 8 detects that the tip of the bar steel 2 has actually collided with the stopper 4, so that the tip of the bar steel 2 has the stopper. 4 can be accurately detected, and at the same time as the detection timing, clamping of the bar 2 is started while the bar 2 is being conveyed. The cycle can be shortened, and as a result, the operating efficiency of the cutting line can be improved.

Further, since the clamping of the bar 2 is started while the bar 2 is being conveyed simultaneously with the timing when the tip of the bar 2 reaches the stopper 4, the tip of the bar 2 collides with the stopper 4. Bounce can be minimized, and as a result, the length of the bar product after cutting can be prevented from being defective. In the above embodiment,
The case where the present invention is applied to the hot sawing equipment after rolling in the section steel mill was taken as an example, but instead, the present invention is applied to billet sawing equipment and other strip cutting equipment in a billet mill. May be applied.

In the above embodiment, the vibrometer 8 is used as an example of a means for detecting that the tip of the bar steel 2 has actually contacted the stopper, but it is not necessarily limited to this. It may be configured to detect that the tip of the bar steel 2 actually abuts on the stopper 4 using another sensor such as a sensor or a photoelectric sensor.

[0020]

As is apparent from the above description, according to the present invention, it is possible to improve the operating efficiency of the cutting line and to obtain an accurate cut length of the strip.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram for explaining a method for cutting a strip which is an example of an embodiment of the present invention.

FIG. 2 is a control block diagram of a method of cutting a strip.

FIG. 3 is a time chart illustrating a relationship between table speed, time, and start / completion timing of a clamp;
(A) is an example of the present invention, and (b) is a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Transport table (transport path) 2 ... Steel (strip) 3 ... Gauge stopper equipment 4 ... Stopper 5 ... Clamping device 6 ... Hot saw (cutting device) 7 ... Measurement roll 8 ... Vibration meter 15 ... Controller

Claims (3)

[Claims] The present invention detects that the tip of a strip conveyed on a conveyance path actually abuts a stopper which is moved and arranged at a predetermined position on the conveyance path, and drives the conveyance path at the detection timing to drive the conveyance path. A method for cutting a strip material, comprising: starting a clamp, stopping the drive of the conveying path when the clamp is completed, and cutting the strip material to a predetermined length by a cutting device in this state. 2. The method for cutting a strip according to claim 1, wherein a vibrometer is used as means for detecting that the tip of the strip has actually contacted the stopper. 3. A stopper which is arranged movably along a conveying direction of a conveying path for conveying the strip, and which is disposed on the conveying path so as to be able to move close to and away from each other so that the tip of the strip comes in contact with the stopper when approaching. A gauge stopper device, comprising a vibrometer for detecting that the end of the strip abuts on the stopper.