JPH08215924A - Method and apparatus for diagnosing shear clearance in double cut shearing apparatus - Google Patents

Abstract

PURPOSE: To provide a method and apparatus for diagnosing a shear clearance to accurately detect the shear clearance in a double cut shearing apparatus. CONSTITUTION: Compressed air is blown out through a plurality of through holes 25a, 25b prided in a plane at right angle to the lower part shear blade mount 23 and the line of the lower part shear blades 24a, 24b. An actual shear clearance value obtained by detecting the back pressure is compared with a reference shear clearance value to calculate a shear clearance deviation value and judge whether or not the shear clearance is proper. Thus, it is possible to diagnose the shear clearance of the double cut shearing apparatus on line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for diagnosing shear clearance of a double cut shear device and its device.

[0002]

2. Description of the Related Art Generally, in a continuous process line, a leading strip and a trailing strip are joined together at their ends to be continuous, and then a predetermined process is performed in each process line. Such joining is usually performed using a process line welder. That is, after the tail end portion of the preceding strip and the tip end portion of the trailing strip are respectively cut by the shearing device provided in the process line welder, the tail end portion and the tip end portion are butted against each other and along the butted groove. Laser beam welding or flash butt welding, or resistance welding in which the tail end portion and the tip end portion are vertically overlapped with each other and sandwiched between the electrodes for welding.

Here, for example, a conventional laser beam welding apparatus will be described with reference to JP-A-63-52787. As shown in FIG. 7 to FIG. 8, the inlet side and outlet side clamp devices 2 and 3 are installed on the common base 1 at predetermined intervals, and the inlet side and outlet side clamp devices 2 and 3 are connected to the left and right. Between the shear device 4 that can move forward and backward in the direction, and similarly, the back bar device 5 that can move forward and backward in the left-right direction is installed between the input side clamp device 2 and the output side clamp device 3, respectively.

Further, an upper head 6 is attached to the upper portion of the outlet side clamp device 3, and the upper head 6 is mounted on the upper head 6 in the left-right direction, that is, both strip end face directions and the inlet side.
Welding carriages 7 and 8 for moving a processing head 9 in the outgoing direction and in a vertical direction between both strip end surfaces are provided, and a transmission pipe 10 for transmitting a laser beam oscillated from a laser oscillator 11 is provided. Here, the arrow A indicates the moving direction of the trailing strip 13. Further, FIG. 9 shows an optical system of a laser beam used in the above laser beam welding apparatus, which includes a reflecting mirror 14 for changing the optical path of the laser beam 16 and a condenser lens 15 built in the processing head 9. It consists of and.

Next, the operation of this conventional device will be described. In the steelmaking process line, when the strip is subjected to continuous treatments such as pickling, plating, and heat treatment, the strip is traveling in the direction indicated by arrow A in FIG. Then, when the strip is sent to reach the end, the preceding strip 12 is moved to the shear device 4 as shown in FIG.
It is guided to the inside of the blade width 4a and stops. When this happens,
The trailing strip 13 has its leading end with the blade width 4 of the shear device 4.
It is sent into a and stops. Then, as shown in FIGS. 7 and 10, the back bar device 5 is retracted, and the shear device 4 is moved.
Moves forward and is located between the inlet side clamp device 2 and the outlet side clamp device 3.

Next, the leading and trailing strips 12 and 13 are clamped by the clamp pads 17a to 17d of the respective clamp devices 2 and 3, and then the upper shear blade of the shear device 4 descends to face the opposite ends of both strips 12 and 13. Disconnect. Then,
As shown in FIGS. 8 and 11, the shear device 4 is retracted,
The back bar device 5 moves forward and is located between the inlet side clamp device 2 and the outlet side clamp device 3, and then the inlet side clamp device 2 is moved to the outlet side clamp device 3 side by a predetermined amount, and the preceding strip 12 and the rear strip 12 are moved. The cut surfaces of the row strips 13 are butted against each other so that the root gap of the butted portions is a predetermined amount.

Next, the two strips 12 and 13 abutted against each other
The welding carriage devices 7 and 8 are set by moving the welding carriage devices 7 and 8 in the inlet and outlet directions, that is, at right angles to the end faces of the strips 12 and 13 so that the processing head 9 is located on the abutting portion. In this way, after the preparation for welding is completed, the laser beam 16 oscillated by the laser oscillator 11 is redirected by the reflection mirror 14 and the condenser lens 15 is passed through the transmission tube 10, as shown in FIG. The welding carriage device 7 is moved in the left-right direction, that is, both strips 12,
Both strips 1 by moving toward the end face of 13
Weld 2 and 13 continuously.

However, the following points can be cited as causes of welding defects in the butt welding in the above-mentioned conventional laser beam welding apparatus. That is,
If the actual values such as laser output and traveling speed of the processing head deviate greatly from the set values, the mechanical accuracy of the input side clamp device, output side clamp device, shear device, back bar device, etc. will change and oil will leak to the actuator. When there is a problem such as when.

As measures against these problems, various determination and diagnosis methods mainly for monitoring the abnormality determination have been proposed in the above case. However, in the case of, there is no suitable measure, and the process line in operation is stopped each time, the corresponding equipment is disassembled and detailed inspection and measurement are performed.
I was repairing after confirming the defective part. In particular, in the method for measuring the clearance between the upper shear blade and the lower shear blade (hereinafter referred to as shear clearance) of the double-cut shear device according to the present invention, the measurement operator inserts a skimming gauge into the gap between the upper shear blade and the lower shear blade. However, putting fingers between the upper shear blade and the lower shear blade is extremely dangerous, and in some cases, there is a risk of injury.

Further, when the above method is carried out, the process line must be stopped each time, and there is a restriction that it can only be carried out periodically, for example, on plant holidays. It was impossible to constantly measure the state of shear clearance, which changes very slightly. Further, when a welding failure due to the above-mentioned abnormal factors is detected, there is a problem that the welded strip meanders in the process line or the weld portion of the strip breaks, and the process line must be stopped for a long time. However, if the abnormality continues for a long time, there is a possibility that the operation may suffer great damage.

[0011]

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art as described above, and accurately detects the shear clearance of a double-cut shearing device so that the strip is processed. Provided are a shear clearance diagnosis method and apparatus for a double-cut shear device for cutting both opposing ends of a leading strip and a trailing strip to prevent meandering in a line and breaking of a welded portion of the strip. The purpose is to

[0012]

SUMMARY OF THE INVENTION The present invention diagnoses shear clearance in a double-cut shear device having two sets of upper and lower shear blades that simultaneously cut opposite ends of a leading strip and a trailing strip. In the method, compressed air is blown through a plurality of through-holes provided on the surface in a direction perpendicular to the line of the lower shear blade, and the actual shear clearance value and the reference shear obtained by detecting the back pressure thereof. A shear clearance diagnosing method for a double-cut shear device, characterized in that a shear clearance deviation value is calculated by comparing it with a clearance value to judge whether the shear clearance is good or bad.

It should be noted that the actual shear clearance value is preferably obtained according to the detected back pressure using a preset relationship between shear clearance and back pressure, and the shear clearance deviation value is preset. It is preferable to issue an abnormal alarm when the specified shear clearance deviation value is exceeded. In addition, the present invention provides two upper shear blades and two lower shear blade mounts, which are assembled to an upper shear blade mount that simultaneously cuts opposite ends of a leading strip and a trailing strip. In a device for diagnosing the shear clearance of a double-cut shearing device having a lower shearing blade, the two shearing blades are provided so as to penetrate both side surfaces in a direction perpendicular to the line of the lower shearing blade mounting base and two lower shearing blades. A plurality of through-holes, a pressure conduit connected to the outer open end of the through-hole to supply compressed air through a pressure reducing valve and a solenoid valve, and an output signal for opening and closing the solenoid valve, and the pressure conduit. Input the detection signal of the pressure sensor attached to the to calculate the actual shear clearance value and compare it with the preset reference shear clearance value to obtain the shear clearance deviation value. Calculated, and the shear clearance deviation is shear clearance diagnostic apparatus of a double-cut shear device comprising a computer which outputs an abnormality alarm when it exceeds a preset reference Shah clearance deviation value, in that it consists of.

[0014]

According to the present invention, compressed air is blown into the gap between the upper shear blade and the lower shear blade, the back pressure is detected to obtain the actual shear clearance value, and the actual shear clearance value is compared with the preset reference shear clearance value. The shear clearance deviation value is calculated, and when this shear clearance deviation value exceeds the reference shear clearance deviation value, an abnormal alarm is issued.Therefore, the abnormality of the difference in the abutment amount of the upper shear blade and the lower shear blade can be checked online. It can be detected early.

[0015]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic view showing an embodiment according to the present invention. In the drawing, the same members as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted. As shown in this figure, the double-cut shear 20 has two upper shear blades 22.
The upper shear blade mounting base 21 supports a and 22b, and the lower shear blade mounting base 23 supports two lower shear blades 24a and 24b facing the upper shear blades 22a and 22b, respectively. In addition, the lower shear blade mount 23 and the lower shear blade
24a and 24b are provided with a plurality of through holes 25a and 25b on the surface perpendicular to the line.

Pressure conduits 27a and 27b are connected between the open ends of the through holes 25a and 25b and the compressed air supply source pipe 26, and a shut-off valve 28 is connected to each of the pressure conduits 27a and 27b.
a, 28b, pressure reducing valves 29a, 29b, solenoid valves 30a, 30b are connected, and pressure sensors 31a, 31b are further attached.
Detection signals of these pressure sensors 31a, 31b are sent to signal converters 33a, 33b via signal cables 32a, 32b,
The converted signal is input to the computer 35 via the signal cables 34a and 34b.

The calculator 35 and the indicator 36 are connected by a signal cable 37, and the value calculated by the calculator 35 is displayed by the indicator 36.
Is displayed. On the other hand, the solenoid valve 30 output from the computer 35
The open / close command signals for a and 30b are sent via signal cables 38a and 38b. Note that the computer 35 is allowed to advance stores a relationship characteristic curve of the shear clearance and back pressure as shown in FIG. 2, also reference Shah clearance value G _S
And the reference shear clearance deviation value ΔG _S are set in advance. This characteristic curve of shear clearance and back pressure is prepared by arranging experimental values obtained by an experiment conducted in advance using a separate experimental apparatus.

When the leading strip 12 and the trailing strip 13 are cut by using the double-cut shear 20, first, the upper shear blade mount 21 waiting at the upper portion of the line as shown in FIG. 3 (a). The tail end portion 12b of the leading strip 12 and the tip end portion 13a of the trailing strip 13 are positioned substantially in the center of the position of the upper stripper blade mounting base 21 by the opening command signal output from the computer 35 when the upper shear blade mounting base 21 starts descending. Solenoid valve 30
The a and 30b are opened, and the compressed air of the compressed air supply pipe 26 is blown to the surfaces of the upper shear blades 22a and 22b through the through holes 25a and 25b. The pressure sensors 31a and 31b detect the back pressure at this time and input it to the computer 35 via the signal converters 33a and 33b. Further, the upper shear blade mounting base 21 is lowered to overlap the lower shear blades 24a and 24b as shown in FIG. 3 (b) to start cutting at both ends at the same time. At the same time, the calculator 35
Calculates the actual shear clearance value G _M from the relationship characteristic of FIG. 2 according to the back pressure at that time.

This actual shear clearance value G _M is compared with a preset reference shear clearance value G _S to calculate a shear clearance deviation value ΔG, and the calculated result is constantly displayed on the display 36, and the shear clearance is also displayed. The deviation value ΔG is the standard shear clearance deviation value Δ
When it exceeds G _S , it is displayed as an abnormal alarm.
Then, the upper shear blades 22a and 22b are further lowered, and
At the time of completion of disconnection shown in (c), the computer 35 outputs a closing command signal to close the solenoid valves 30a and 30b. At the same time, the upper shear blade mount 21 rises to the original standby position.

An application example of the present invention will be described below. The lower shear blade mount 23 and the lower shear blades 24a, 24b of the double-cut shear 20 are provided with five through holes 25a, 25b, 10 in each of two rows, and each through hole 25a,
The pressure conduits 27a and 27b are individually connected to the open ends of 25b,
Stop valves 28a, 28b, pressure reducing valves 29a, 29b, solenoid valves 30a, 30
b was connected and pressure sensors 31a and 31b were attached.
The pressure reducing valves 29a and 29b are adjusted so that the pressure of the compressed air supplied from the compressed air supply pipe 26 to the pressure conduits 27a and 27b is always constant.

An example of the result of measuring the back pressure when the leading strip 12 and the trailing strip 13 are sheared while blowing compressed air from the through holes 25a and 25b is shown in FIG. That is, at the stage immediately before the upper shear blades 22a, 22b immediately after opening the solenoid valves 30a, 30b and the lower shear blades 24a, 24b overlap with each other, a transition is made in the low pressure region as shown in (a) and shearing is started. At the stage, the pressure rapidly increased as shown in (b), then decreased slightly and remained at the higher pressure shown in (c) until the stage of shear termination.

To supplement the characteristics of the back pressure change, the upper shear blades 22a and 22b and the lower shear blades 24a and 24b have a shearing shape in which the shearing blade main body is sheared as shown in FIG. It is made thinner than the tip of the blade. This is for the purpose of preventing damage to the side surface of the shear blade and deformation of the tip portion of the strip due to contact of the tip portion of the strip with the side surface of the shear blade during shearing of the strip.

Therefore, first, before the start of shearing in FIG. 5 (a), the solenoid valves 30a and 30b are opened and the lower shear blade 24 is opened.
When compressed air is supplied to the through holes 25a and 25b of a and 24b,
Since the upper shear blades 22a, 22b and the lower shear blades 24a, 24b do not overlap with each other, the pressure loss of the compressed air blown out from the through holes 25a, 25b is small, and therefore the back pressure becomes equal to the supplied compressed air pressure.

However, at the start of shearing in FIG. 5 (b), the upper shear blades 22a and 22b descend and the upper shear blade 22 moves.
When the a and 22b and the lower shear blades 24a and 24b overlap each other, the clearance between the upper shear blades 22a and 22b and the lower shear blades 24a and 24b becomes very small, and therefore the through holes 25a and 25b.
The pressure loss of the compressed air blown out from the cylinder increases, and its back pressure becomes higher than the supply compressed air pressure.

Next, after the shearing of the strip is completed, as shown in FIG.
In the state of (c), the clearance between the upper shear blades 22a, 22b and the lower shear blades 24a, 24b becomes larger than that at the start of shearing in FIG. 5 (b), so compressed air blown out from the through holes 25a, 25b is The pressure loss will decrease slightly and the back pressure will decrease. Therefore, as mentioned above, the upper shear blade
It can be seen that the back pressure detection value at the start of shearing shown in FIG. 4B can be used to calculate the clearance between the lower shear blades 22a and 22b and the lower shear blades 24a and 24b.

FIG. 6 is a trend graph in which the shear clearance deviation value ΔG obtained from the actual shear clearance value G _M and the reference shear clearance value G _S during actual operation of the double cut shear device is plotted every day. . In this figure, when the line is stopped, the upper shear blade 22
a, 22b and the lower shear blade 24a, 24b both have a time when exchanged with a new and 0 day of, after observation start, Shah clearance deviation .DELTA.G with the passage of the number of days used in within the reference shear clearance deviation value .DELTA.G _S Although it was slightly changed, it gradually increased from the time when 35 days had passed, and finally exceeded the reference shear clearance deviation value ΔG _S on the 40th day, and an abnormal alarm was output. As a result of investigating the cause, it was found that the upper shear blades 22a, 22b and the lower shear blades 24a, 24b were abnormally contacted for some reason, and both were abnormally worn to increase the shear clearance. Then, as a result of immediately replacing the upper shear blades 22a, 22b and the lower shear blades 24a, 24b, it was possible to prevent the occurrence of rupture due to defective welding of the strips, in the same level as at the beginning of the observation. It was

As described above, when the shear clearance of the double-cut shearing device becomes abnormal, the state can be quantitatively measured and analyzed, so that the difference in the amount of butting of the upper shearing blade and the lower shearing blade can be measured. It is possible to detect abnormalities in the above-mentioned condition at an early stage, and thus prompt action can be taken.

[0028]

As described above, according to the present invention,
Compressed air is blown into the gap between the upper shear blade and the lower shear blade, the back pressure is detected to obtain the actual shear clearance value, and the shear clearance deviation value is calculated by comparing with the preset reference shear clearance value. When the shear clearance deviation value exceeds the reference shear clearance deviation value, an abnormality alarm is issued, so an abnormality in the difference in the abutment amount of the upper shear blade and the lower shear blade can be detected online at an early stage. Since it is possible to take quick action, it is possible to maintain the welding quality of the process line welder, and it is effective in stabilizing the line operation and reducing the operation cost.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment according to the present invention including a partial sectional view.

FIG. 2 is a characteristic diagram showing a relationship between shear clearance and back pressure.

3A to 3C are sectional views showing the operation of the double cut shear device.

FIG. 4 is a characteristic diagram showing a time transition of back pressure.

5 (a) to 5 (c) are explanatory views showing a positional relationship between an upper shear blade and a lower shear blade.

FIG. 6 is a characteristic diagram showing a change in shear clearance deviation value.

FIG. 7 is a perspective view showing an operating state of a conventional laser beam welding apparatus.

FIG. 8 is a perspective view showing an operating state of a conventional laser beam welding apparatus.

FIG. 9 is an explanatory diagram of an optical path of a laser beam.

FIG. 10 is an explanatory diagram of an operating state of a conventional laser beam welding device.

FIG. 11 is an explanatory diagram of an operating state of a conventional laser beam welding device.

[Explanation of symbols]

20 Double-cut shear 21 Upper shear blade mount 22a, 22b Upper shear blade 23 Lower shear blade mount 24a, 24b Lower shear blade 25a, 25b Through hole 26 Compressed air supply pipe 27a, 27b Pressure conduit 28a, 28b Stop valve 29a , 29b Pressure reducing valve 30a, 30b Solenoid valve 31a, 31b Pressure sensor 32a, 32b, 34a, 34b, 37, 38a, 38b Signal cable 33a, 33b Signal converter 35 Computer 36 Indicator

Claims (4)

[Claims] 1. A method for diagnosing shear clearance of a double-cut shear device having two sets of upper shear blades and lower shear blades for simultaneously cutting both opposing ends of a leading strip and a trailing strip, comprising: Compressed air is blown through a plurality of through holes provided on the surface perpendicular to the line, and the actual shear clearance value obtained by detecting the back pressure of the compressed air is compared with the reference shear clearance value. A shear clearance diagnosing method for a double-cut shear device, which comprises calculating a clearance deviation value and determining whether the shear clearance is good or bad. 2. The double cut shear according to claim 1, wherein the actual shear clearance value is obtained in accordance with the detected back pressure by using a preset relationship between shear clearance and back pressure. Shear clearance diagnosis method for equipment. 3. The shear clearance diagnosing method for a double-cut shear device according to claim 1, wherein an abnormal alarm is issued when the shear clearance deviation value exceeds a preset reference shear clearance deviation value. 4. Two upper shear blades attached to an upper shear blade mount and two upper shear blades attached to a lower shear blade mount that simultaneously cut opposite ends of a leading strip and a trailing strip. In a device for diagnosing shear clearance of a double-cut shear device having a lower shear blade, the shear clearance is provided so as to penetrate both side surfaces in a direction perpendicular to the line of the lower shear blade mount and two lower shear blades. A plurality of through-holes, a pressure conduit connected to the outside open ends of the through-holes to supply compressed air via a pressure reducing valve and a solenoid valve, and outputs an opening / closing signal of the solenoid valve and to the pressure conduit. Input the detection signal of the attached pressure sensor to calculate the actual shear clearance value, and compare it with the preset reference shear clearance value to calculate the shear clearance deviation value. A shear clearance diagnostic device for a double-cut shear device, comprising: a calculator that outputs an abnormal alarm when the shear clearance deviation value exceeds a preset reference shear clearance deviation value.