JPS5950451B2 - Running shear length abnormality detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a running shear abnormality detection device that accurately detects defective products when shearing a metal band (hereinafter referred to as a strip).

Continuous shearing of the hot- or cold-rolled strip is usually carried out in a shear line using various shearing machines such as a flying shear, an up-cut shear, and a round-cut shear.

In order to ensure the desired shearing length in these shearing machines, when guiding the strip to the shearing shear using a feed roll or belt, first place the movable gauge stopper at a set position and place the tip of the strip on this stopper. A commonly used method is to shear the material with a shearer after abutting against it.

In this type of shearing method, even if the stopper mounting position is accurately set to the desired size, the speed and timing of the feed roll of the shear line cannot be matched well, often resulting in misalignment of operation, which is especially likely to occur during acceleration and deceleration. In extreme cases, the tip of the strip may not reach the stopper and become shorter than the specified size, or the tip of the strip may bend at the stopper, sometimes even going over the stopper and becoming longer than the specified size. obtain.

There is also a method of securing shear length by installing a photoelectric detector,
Due to chattering of the photoelectric detector (chattering, malfunction based on the circuit configuration inside the detector, contact points, partial reflections on the surface of the steel plate, etc.), the charging detector malfunctions while the steel plate is being fed, causing the steel plate to reach the specified length. The cut may be made before the cut is made or beyond the predetermined length.

The shear length tolerance of these metal plates varies depending on the type of strip to be sheared and its purpose, but the shear length tolerance is especially tight for thin sheets such as cold-rolled steel sheets, with some types having extremely tight tolerances of ±0.2 mm. .

When such tight tolerances are required, if shearing is performed continuously at high speeds, it is difficult to detect abnormalities in shear length by visual inspection on the shearing line, and some defective products may be shipped. It is not uncommon for this to cause process trouble for users.

To solve the above-mentioned drawbacks, it is often used to install a shear length abnormality detector in the shearing machine, but this is a type that measures the shear length after shearing and detects abnormalities. Variations in the shear length measurement occur due to deviations in the moving speed of the thin plate, bending and meandering of the plate, etc., which are unique to thin plates, and it is difficult to accurately detect the shear length.

Furthermore, the biggest drawback of this type of shear length anomaly detection method is that there is a relative velocity between the detector and the shear plate.
It is impossible to maintain a high degree of measurement accuracy due to factors such as the responsiveness of electric circuit elements required from detection to determination.

Furthermore, the shearing length of the steel plate sheared by these shearing machines varies depending on the application, so in addition to changing mechanical settings such as changing the stopper position of the shearing machine, the settings of the shearing length abnormality detector are also changed. Sometimes you have to.

In this case, the time it takes to change the settings will be Lost tights,
This is undesirable as it results in a decrease in productivity.

The present invention was made for the purpose of eliminating the various drawbacks mentioned above, and provides a detector that easily and accurately detects shear length abnormalities by installing a metal detector at a specific position of a gauge stopper of a shearing machine. This is what we are trying to provide.

The gist of the present invention is that, in a shear line in which a metal strip provided with a gauge stopper on the rear surface of the shearing machine is continuously sheared at high speed within a predetermined shearing dimension tolerance range, a gauge that is perpendicular to the traveling direction of the metal strip to be sheared is used. A non-contact type metal detector is removably buried in the stopper head surface, and the metal detector is buried at a position where the detection area of the metal detector matches the specified shearing dimensional tolerance range of the metal strip to be sheared. This is a running shear length abnormality detector characterized by the following.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an overall configuration diagram of a shear line in which a running shear length abnormality detector of the present invention is embedded in a gauge stopper.

1 is a sheared strip which is moved in the direction of the arrow by feed rolls 2;

3 is a flying shear frame which includes upper and lower blades 4, 4', and is connected by a link mechanism of feed tables 5 and 6 so as to slide left and right as a unit.

The strip 1 is sheared by a shearing device 3' consisting of a speed tuning device and a shear length setting mechanism.

7 is a gauge stopper which is held by an exit clipper 8 to determine the shear length.

A shear length abnormality detector, which is a key part of the present invention, is embedded in the gauge stopper 7.

This burial location is the second feature of the present invention.
This will be explained in detail with reference to FIGS.

In a flying shear, the strip is sheared when the relative velocity between the speed of the strip to be sheared and the shearing feed rate becomes 0, so although it is called running shearing, it is actually the same as static shearing, and in this case, the position of the gauge stopper head 9 If the shearing length is set to a specified value, the length of shearing can be determined by the state of contact between the tip of the strip to be sheared and the head of the gauge stopper.

The cause of the shearing failure caused by the flying shear as shown in FIG. 1 is mainly caused by the opening/closing of the feed roll 2, deviations in the rolling balance, timing, and the like.

FIG. 2 shows the positional relationship between the tip of the strip 1 to be sheared and the gauge stopper head 9 during shearing.

That is, in case (a), the tip of the strip 1 and the head 9 of the gauge stopper come into contact and are sheared normally.

In case (b), the tip of the strip and the gauge stopper head are far apart, and the strip does not reach the specified size and is sheared short.

In case (C), contrary to (b), the tip of the strip rides on the gauge stopper head and is sheared to a length longer than the specified size.

The shear length abnormality occurs in cases (b) and (C) above, and as a device capable of detecting this abnormality, the present inventors installed a non-contact metal detector 10 (in this example, a commercially available device) on the stopper head 9. (hereinafter referred to as proximity switch)
By embedding the signal and forming a logic circuit with the shear signal, the shear abnormality can be detected at the same time as the shear, resulting in an innovative device that is accurate and has no time lag.

Next, the buried position of the proximity switch will be specifically explained.

FIG. 3 is a perspective view of the vicinity of the gauge stopper in which the proximity switch 10 is embedded, and the proximity switch 10 is embedded in the center of the strip 1 in the width direction.

11 is a lead wire of the proximity switch. In this embodiment, only one detector is used, but a plurality of detectors may be installed.

If the plate thickness, width, and shape vary widely and require precision, it is necessary to bury multiple pieces, whereas if the plate thickness is thin, narrow, and the shape is good, one or two pieces may be sufficient.

In this embodiment, the strip is embedded in the center of the width of the strip to be sheared, but since this happened to be a thin plate with very small dimensional variation in the width direction, the center of the width is used as a representative example.

If multiple pieces are to be buried, they should be placed at points that are evenly divided in the width direction, but if there is a particular point to be measured, they may be buried at that point.

The gauge stopper arm 12 is fixed to the gauge stopper head 9 at 13, and is pivoted at 14 so as to be rotatable up and down in the direction in which the strip travels.

The gauge stopper head 9 moves downward after shearing is completed, but does not hinder the progress of the wrist strip.

After the sheared sheet passes, it returns to its original position (the position where the stopper head is perpendicular to the direction of travel).

Next, the vertical buried position of the proximity switch will be explained with reference to an enlarged sectional view of the vicinity of the gauge stopper in FIG.

The vertical buried position of the proximity switch is the lower limit 15' of the proximity switch detection area 15 (area surrounded by a dotted line).
shall be at the same level as the bottom surface 1'' of the tip of the IJ tube 1.

Also, the upper limit 15'' of the proximity switch detection area 15 is such that when the strip 1' is too long and runs over the gauge stopper 9,
Any part of said strip 1' is the detection area 1 of the metal detector.
Points that do not fall within 5.

Also, the length of the proximity switch detection area 15 is made to match the specified dimensional tolerance of the strip to be sheared.

If you set the proximity switch in the buried position as above,
Sheared strip) Long/short shear length of IJ tube At the time of abnormal shearing, no part of the strip enters the proximity switch detection area.

That is, if the shear length is too short to meet the specified dimensional tolerance, it will not enter the proximity switch detection area 15, and if the shear length is long, it will jump over the detection area.

Here, if the shear length is too long, it should be noted that the detection range 15 must be determined by considering the material, thickness, etc. of the strip, and the curvature of the strip 1' that rides on the gauge stopper 9. It is.

This relationship will now be explained using a specific example shown in FIG.

If the shearing length of the strip 1' to be sheared is too long and it passes over the gauge stopper head 9 as shown in the figure, (a) the strip is thin and the radius of curvature 16 formed with the gauge stopper head is small, and (b) ) in case of) IJ
Since the radius of curvature 16' of the thicker knob becomes larger, the detection area 15 of the proximity switch 10 can naturally be longer.

Therefore, the position of the proximity switch should be set while taking into account the relationship between the dimensional tolerance of the shearing material and the detection range, and naturally the buried position should be designed to be detachable.

The reason why the strip detection surface 17 of the proximity switch is buried inside the gauge stopper head 9 in FIGS. 4 and 5 is to prevent the strip tip from directly hitting the surface 17 and damaging the proximity switch. It is something.

The embedding position of the proximity switch in the gauge stopper head has been described in detail above.Next, as one aspect of the shear length abnormality detection device according to the present invention, an example in which a judgment circuit as shown in FIG. 6 is combined will be explained. .

The shear signal and the gauge stopper detection signal, which are in separate systems, are connected to the waveform shaper.) A judgment circuit is configured using an AND circuit and a NOT circuit, and if a shearing defect is detected, the defective sheet number counter, abnormality alarm, and reject circuit are sent to the waveform shaper. will be rejected.

Next, the operation will be described in the case where shearing work is performed using the shear length abnormality detection device of the present invention.

First, when shearing the strip 1, use the proximity switch 10 to make sure that the tip of the strip is in the correct position on a part of the gauge stopper.
The output of the AND circuit shown in FIG. 6 is ON, and the output from the NOT circuit is OFF, so that the abnormality detection device does not operate.

However, when the shear length is abnormal, the signal of the gauge stopper proximity switch is OFF, so the output of the AND circuit is OFF.
becomes.

Therefore, the output of the NOT circuit is turned ON, the abnormality detection device is activated, increments the number of the defective sheet number counter by 1, sounds an abnormality alarm, and activates the reject circuit to reject the sheet.

As explained above, when the traveling shear length abnormality detection device according to the present invention is used, a non-contact metal detector is embedded directly in the gauge stopper head, so a shear failure can be immediately determined at the same time as a shear, and subsequent resjects can be detected immediately. Since it is linked to the device and is rejected, the detection device is separated from the system and the gauge stopper head is equipped with a detection terminal such as a detection rod.
Compared to the conventional method of indirect detection using a spring, this method is completely free of malfunctions, can be fully automated, and requires less effort to inspect the upper seats, which is a great advantage.

[Brief explanation of drawings]

Figure 1 is an overall configuration diagram of a flying shear line incorporating an embodiment of the present invention, Figures 2 a, l), and c are explanatory diagrams showing the contact state of the sheared strip and the gauge stopper head; Figure 3 is a perspective view of a part of the gauge stopper in which the proximity switch, which is the main part of the present invention, is embedded;
The figure is a sectional view taken along line A-A in Figure 3, Figures 5a and 5l) are diagrams explaining the relationship between the detection area of the proximity switch and the strip,
FIG. 6 shows a block diagram of sequence control which is one aspect of the present invention. 1, 1'... Strip to be sheared, 2...
・Feed roll, 3... Flying shear frame, 3'... Shearing device, 4,4'...
... Flying shear upper and lower blades, 5 ... Feed table, 7 ... Gauge stopper, 8 ...
...Exit gripper-19...Gauge stopper head, 10...Proximity switch, 1
5. 15', 15''... Proximity switch detection area.

Claims (1)

[Claims] 1 In a shear line that continuously shears a metal strip with a gauge stopper on the rear surface of the shearing machine to a predetermined shear dimension tolerance range, a non-contact metal strip is attached to the gauge stopper head surface perpendicular to the direction of movement of the metal strip to be sheared. A running space characterized in that a detector is removably buried, and the metal detector is buried at a position that matches the detection area of the metal detector with the specified shear dimensional tolerance range of the metal strip to be sheared. Shear length abnormality detection device.