JP6519019B2 - Notching apparatus and method - Google Patents

Description

  The present invention relates to a notching device and a notching method capable of automatically canceling the biting of a notching blade.

  In a continuous processing line in a steel mill, for example, a continuous rolling line, a continuous annealing line, and a continuous pickling line, after welding two steel plates of a leading plate and a trailing plate, rolling, annealing, pickling, etc. Do the processing. At this time, if the widths of the steel plates to be welded are different, as shown in FIG. 1, step portions 1 are formed at both ends in the width direction in the welded portion of the leading plate 2a and the trailing plate 2b. If this step portion is left as it is, when tension is applied to the steel plate after welding, stress is concentrated on the step portion, which causes plate breakage.

  So, after welding a steel plate, cutting (notching) the level | step-difference part formed in the welding part is performed using the notching apparatus provided with the blade for notching. Specifically, as shown by the hatched portion in FIG. 1, the both ends in the width direction of the step portion are cut using a notching blade having a semicircular plan view, so that the surface is smooth and rounded. It has an edge shape to prevent stress concentration in the weld.

  The notching blade comprises an upper blade and a lower blade disposed on the front and back sides of the steel plate so as to sandwich the steel plate. The lower blade is disposed in contact with the back surface of the steel plate, and the upper blade stands by at an initial position above the surface of the steel plate. At the time of cutting, the upper blade is lowered from the initial position to the bottom dead center and then returned to the initial position to prepare for the next cutting operation. While the upper blade is lowered from the initial position to the bottom dead center, the upper blade and the lower blade are engaged to cut the steel plate. Thus, the notching device performs the notching operation of the steel plate by repeating the operation of lowering and raising the upper blade. Patent document 1 is mentioned as a document which disclosed the technique regarding a notching apparatus.

JP 05-123878 A

  When the sharpness of the notching blade is deteriorated or the hard material is notched, the upper blade can not be further lowered during cutting of the steel plate, and biting occurs. Heretofore, there has been no automatic detection and cancellation of biting of the upper blade, and detection and cancellation of biting have been performed by the operator. Hereinafter, the detection and cancellation operation of the bite stop by the operator will be specifically described.

  When biting of the notching blade occurs, an error signal is sent to the operator's room monitoring the ingress of the continuous processing line. An operator located in the operator's room notices the error signal to detect that the notching device has stopped biting.

  The operator who has detected the bite moves from the operator's room to the operation panel disposed in the vicinity of the notching device, and manually operates the operation panel to lift the upper blade to thereby release the bite. After the bite has been eliminated, the upper blade is lowered again to resume the cutting operation. As described above, in the conventional method of detecting and removing the bite, it is necessary for the operator to move between the operator room and the operation panel to manually operate the operation panel, which places a heavy burden on the operator. In particular, in the case of a high-tensile steel plate or a steel plate having a large plate thickness, biting of the notching device may frequently occur, and thus the burden on the operator may be further increased.

  In addition, if the biting in the notching device is not eliminated, the processing portion of the continuous processing line may be stopped or reduced in speed. Therefore, it is desirable that the biting of the notching device be eliminated early. However, in the conventional method in which the operator recognizes the bite stop of the upper blade in the operator room and then moves to the control panel and operates the upper blade, the bite stop occurs until it is resolved. It takes time.

  The present invention has been conceived in view of the above problems, and is capable of automatically detecting the biting stop of the notching blade and reducing the work load on the operator while simultaneously eliminating the biting stop. It is an object of the present invention to provide an apparatus and a notching method.

The means for solving the above problems are as follows.
[1] A notching device for cutting both widthwise end portions of a steel plate, which is located on an upper blade that descends and rises between an initial position above the surface of the steel plate and a bottom dead center, and a back surface side of the steel plate Lower blade,
It has a sensor that recognizes that the upper blade has reached the bottom dead center, and a control device that controls the operation of the upper blade, and the control device controls the upper blade by any of the following operations: A notching device characterized in that.
(Operation 1) When the upper blade reaches from the initial position to the bottom dead center within a predetermined time, the upper blade is raised from the bottom dead center to the initial position.
(Operation 2) If the upper blade does not reach from the initial position to the bottom dead center within a predetermined time, the upper blade is raised to the initial position, and then the number of descents already performed by the upper blade is predetermined. If it is determined that the number of descents that the upper blade has already made is smaller than the predetermined number, the upper blade is lowered again while the upper blade If the number of drops already performed reaches a predetermined number, it is determined that notching is not good and the upper blade is not dropped.
[2] A notching method for cutting both widthwise end portions of a steel plate, which is located on an upper blade that descends and rises between an initial position above the surface of the steel plate and a bottom dead center, and a back surface side of the steel plate Lower blade,
And a sensor for recognizing that the upper blade has reached the bottom dead center, and automatically controlling the upper blade by any of the following operations.
(Operation 1) When the upper blade reaches from the initial position to the bottom dead center within a predetermined time, the upper blade is raised from the bottom dead center to the initial position.
(Operation 2) If the upper blade does not reach from the initial position to the bottom dead center within a predetermined time, the upper blade is raised to the initial position, and then the number of descents already performed by the upper blade is predetermined. If it is determined that the number of descents that the upper blade has already made is smaller than the predetermined number, the upper blade is lowered again while the upper blade If the number of drops already performed reaches a predetermined number, it is determined that notching is not good and the upper blade is not dropped.

  According to the present invention, the biting stop of the notching blade can be automatically detected and eliminated, and the notching defect can be eliminated early while reducing the work load on the operator.

FIG. 1 is a plan view of a welded portion of a steel plate which is notched. FIG. 2 is a simplified view of the notching device. FIG. 3 is a flow chart showing a control mechanism of the operation of the upper blade.

  First, the notching apparatus of the present invention will be described with reference to FIG.

  FIG. 2 is a simplified view of a cross section of the notching device 21 as viewed in the conveyance direction of the steel plate 11. A notching blade 12 consisting of a pair of upper blades 12a and a lower blade 12b at each end in the width direction (lateral direction in the drawing) of the steel plate 11, and a notching blade consisting of another pair of upper blades 13a and lower blades 13b A blade 13 is provided.

  The notching device 21 takes the step portion formed in the welded portion of the steel plate 11 as a portion to be cut, and cuts both widthwise end portions of the steel plate 11 by the notching blades 12 and 13. The notching blades 12 and 13 are held by carriages 19 and 20, and wheels 22 are provided below the carriages 19 and 20 so as to be movable. When the part to be cut of the steel plate 11 reaches the notching device 21, the carriages 19 and 20 are advanced from the retracted position outside the line into the line by a driving device (not shown). Further, after the cutting operation by the notching blades 12 and 13 is completed, the carriages 19 and 20 are retracted from the inside of the line to the retracted position outside the line. Thus, the notching device 21 moves in the width direction of the steel plate 11 to adjust the cutting position.

  The upper blades 12a and 13a are on standby at an initial position at a certain distance from the surface of the steel plate 11 before the start of cutting. When the planned cutting position of the steel plate 11 reaches the notching device 21 and the notching device 21 completes the adjustment of the cutting position, the upper blades 12a and 13a descend from the initial position toward the surface of the steel plate 11 (upper surface in the figure). , Do notching. At this time, the lower blades 12 b and 13 b are fixed in contact with the back surface of the steel plate 11. The lowered upper blades 12a and 13a come in contact with the surface of the steel plate 11, and then the upper blades 12a and 13a advance deeper in the thickness direction of the steel plate 11, and eventually the upper blades 12a and 13a plate the steel plate 11 Cutting completely in the direction completes the notching. Lower blades 12b and 13b are provided on pedestals 15 and 16, respectively.

  The point at which the upper blades 12a and 13a do not descend any further after the notching is completed is referred to as the lower dead point of the upper blades 12a and 13a. The upper blades 12a, 13a that have reached the bottom dead center are raised to the initial position to prepare for the next cutting operation.

  In the present invention, a sensor is provided to detect whether the upper blades 12a, 13a have reached the bottom dead center.

  As a sensor, a contact-type sensor is mentioned, for example. Specifically, one sensor is configured to be lowered together with the upper blade, the other sensor is provided in the vicinity of the lower blade, and when the upper blade is lowered to reach the bottom dead center, one sensor and the other sensor The upper dead center of the upper blade can be detected by contacting the upper blade and the lower blade. In addition, the sensor that detects the bottom dead center is not limited to the above example, for example, a pressure-sensitive sensor that senses the load between the upper blade and the lower blade, a distance sensor that senses the distance between the sensors, etc. It can also be used.

  At the time of cutting by the notching blades 12 and 13, the upper blades 12a and 13a may stop biting, so that notching may not be completed. In this case, the upper blades 12a and 13a can not descend to the bottom dead center, and the descent is stopped halfway. In the present invention, there is provided a control device capable of detecting and canceling the occurrence of biting by controlling the operation of the upper blades 12a and 13a. Below, the flow at the time of controlling operation of upper blade 12a, 13a using a control device is explained using Drawing 3A, 3B.

  First, the case where the upper blade does not stop biting will be described.

  When the welded portion of the steel plate reaches the notching device and adjustment of the cutting position is completed, the controller instructs the lowering of the upper blade and the upper blade starts to descend (S1). Although not shown, the notching device of the present invention has a timer function, and can measure the time after the upper blade starts to descend. The control device can determine whether or not the upper blade has reached the bottom dead center before the predetermined time (predetermined time) elapses after the upper blade starts to descend (S2). ). If the upper blade reaches the bottom dead center within a predetermined time, it is considered that the notching operation is completed, and the upper blade ascends to the initial position and stands by for the next notching operation (S3).

  Next, the case where biting of the upper blade occurs will be described.

  The process proceeds in the same flow as described above until the notcher device receives a descent command and starts descent (S1, S2). If the upper blade does not reach the bottom dead center within a predetermined time after the notcher device starts to descend, notching is not completed and it is considered that the upper blade bite has stopped halfway and the position at which the bit has stopped The upper blade is raised from the position to the initial position (S4).

  Next, the control device determines whether the number of descents that the upper blade has already made is less than a predetermined number (predetermined number) (S5). If the number of descents that the upper blade has already made is less than the predetermined number, the upper blade is lowered again (S2). On the other hand, if the number of descents performed by the upper blade has already reached the predetermined number, it is judged as notching failure and the upper blade is held at the initial position without lowering the upper blade again. For example, if the number of times the upper blade descends is set in advance to five times, the upper blade repeatedly performs the upward and downward movements of the upper blade until the fourth bit stop (S1, S2, S4, S5 are repeated) However, at the fifth bite stop, it is determined that the notching is not good, and after raising the upper blade to the initial position (S4), it does not fall again. The predetermined number of times the upper blade descends can be appropriately set according to conditions such as the steel type, thickness, width, and temperature of the steel sheet at the time of cutting. From the viewpoint of productivity inhibition, it is desirable that the predetermined number of times the upper blade descends be 10 times or less. However, when it is difficult to shear the steel plate, the predetermined number of times may be more than 10 times. In addition, when it is determined that a notching defect is found, the control device may operate an alarm device such as Patlite (registered trademark) to make the noticing defect known to workers.

  Even if the upper blade is lowered for a predetermined number of times, cutting of the steel plate is not achieved, and if it is determined that the notching is not complete, the condition other than the number of lowering of the upper blade is changed to complete notching of the steel plate. be able to. For example, it may be changed to a notching blade suitable for a steel type, considering that the type of the notching blade is not appropriate for the steel type. In addition, it is possible to consider that the notching blade has been deteriorated due to long-term use, and to grind the notching blade or replace it with a new notching blade. Furthermore, it is possible to adjust the clearance between the upper blade and the lower blade and perform notching operation again.

  It is particularly preferable to apply the notching device and the notching method of the present invention to a steel plate having a large thickness and / or a high strength. In such a steel plate, since the problem of the biting due to the notching blade routinely occurs, the effect of the automatic elimination of the biting can be particularly enjoyed by applying the present invention. For example, as plate | board thickness, the steel plate of 4.5 mm or more and 6.5 mm or less is mentioned. Moreover, as a high strength steel plate, a steel plate of 400 MPa or more and 780 MPa or less in tensile strength is mentioned. As a suitable example of such a steel type, it is after hot rolling and the hot rolled sheet steel before performing continuous pickling is mentioned.

  It is desirable that separate sensors be provided on the notching blades provided on the op side and the dr side so that the control device can independently control the respective notching blades. As a result, even if biting occurs on only one of the upper blades on the op side and the dr side, only the upper blade on which the biting has occurred may be controlled to eliminate the biting. it can.

  The hot rolled steel sheet was operated using the notching device of the present invention. The steel plate to be notched had a thickness of 1.2 to 6.5 mm, a width of 1630 mm or less, and a tensile strength of 780 MPa or less. In addition, the predetermined number of times the upper blade was lowered was set to 10 times. In the conventional example (example in which the notching device of the present invention is not used), the operation by the operator panel for canceling bite by the operator occurred 30 times per month, but in the example of the present invention it could be reduced to 0 times. .

DESCRIPTION OF SYMBOLS 1 Step part 2a Leading plate 2b Trailing plate 3 Planned cutting position by a blade for notching 11 steel plate 12, 13 blade for notching 12a, 13a upper blade 12b, 13b lower blade 15, 16 pedestal 17, 18 sensor 19, 20 carriage 21 notching Device 22 wheels

Claims (2)

A notching device for cutting a stepped portion formed at a welded portion at both widthwise end portions of a steel plate,
An upper blade that descends and rises between an initial position above the surface of the steel plate and a bottom dead center,
A lower blade located on the back side of the steel plate,
A sensor that recognizes that the upper blade has reached the bottom dead center;
And a controller for controlling the operation of the upper blade,
It said controller, following the operation, and controls the upper blade, notching device and detecting and eliminating automatically chewing blind of the upper blade.
(Operation 1) When the upper blade reaches from the initial position to the bottom dead center within a predetermined time, the upper blade is raised from the bottom dead center to the initial position.
(Operation 2) If the upper blade does not reach from the initial position to the bottom dead center within a predetermined time, the upper blade is raised to the initial position, and then the number of descents already performed by the upper blade is predetermined. If it is determined that the number of descents that the upper blade has already made is smaller than the predetermined number, the upper blade is lowered again while the upper blade If the number of drops already performed reaches a predetermined number, it is determined that notching is not good and the upper blade is not dropped. A notching method for cutting a stepped portion formed at a welding portion at both widthwise end portions of a steel plate,
An upper blade that descends and rises between an initial position above the surface of the steel plate and a bottom dead center,
A lower blade located on the back side of the steel plate,
Using a sensor that recognizes that the upper blade has reached the bottom dead center,
The following operation, controls the upper blade automatically, notching method characterized by detecting and eliminating chewing blind of the upper blade automatically.
(Operation 1) When the upper blade reaches from the initial position to the bottom dead center within a predetermined time, the upper blade is raised from the bottom dead center to the initial position.
(Operation 2) If the upper blade does not reach from the initial position to the bottom dead center within a predetermined time, the upper blade is raised to the initial position, and then the number of descents already performed by the upper blade is predetermined. If it is determined that the number of descents that the upper blade has already made is smaller than the predetermined number, the upper blade is lowered again while the upper blade If the number of drops already performed reaches a predetermined number, it is determined that notching is not good and the upper blade is not dropped.

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