JPH1015724A - Method and device for diagnosing shear clearance in double cut shear device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for diagnosing a shear clearance of an on-line double cut shear device. SOLUTION: In a surface of a direction at a right angle relating to a lower part shear blade mounting base 23 and a line of lower part shear blades 24a, 24b, a plurality of through holes 25a, 25b are provided, contactless displacement meters 26a, 26b are mounted, a shear clearance is detected as a measured shear clearance value, this measured shear clearance value and a preset reference shear clearance value are compared to be calculated in a computer 30, a measured shear clearance deviation is obtained to decide whether the measured shear clearance value is good or bad.

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 an apparatus therefor.

[0002]

2. Description of the Related Art Generally, in a continuous process line, a leading strip (hereinafter, referred to as a preceding strip) and a succeeding strip (hereinafter, referred to as a following strip) are joined together at their ends to be continuous. Predetermined processing is performed in each process line.
Such bonding is usually performed using a process line welder. That is, after the tail end of the preceding strip and the leading end of the following strip are cut by the shear device provided in the process line welder, the tail end and the leading end are butted against each other, and the butt groove is formed. This is done by laser beam welding or flash butt welding along the line, or by resistance welding in which the tail end portion and the tip end portion are vertically overlapped and sandwiched between 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 FIGS. 7 and 8, entrance and exit clamping devices 2 and 3 are provided on the common base 1 at a predetermined interval, and are provided between the entrance and exit clamping devices 2 and 3. Device 4 that can move back and forth from left and right
A back bar device 5 that can move forward and backward from the left and right directions is respectively installed between the entrance side and the exit side clamping devices 2 and 3.

Further, an upper head 6 is mounted on the upper portion of the output side clamping device 3, and the upper side of the upper head 6 is moved in the left-right direction, that is, in the direction of both end faces of the strip and on the entrance side.
Welding carriage devices 7 and 8 for moving the processing head 9 in the exit direction and in the vertical direction between both end surfaces of the strips are provided, and a transmission tube 10 for transmitting a laser beam oscillated from a laser oscillator 11 is provided. Here, the arrow A indicates the moving direction of the following strip 13. FIG. 9 shows an optical system of a laser beam used in the laser beam welding apparatus. The reflecting mirror 14 for changing the optical path of the laser beam 16 and the condenser lens 15 built in the processing head 9 are shown. It is composed of

Next, the operation of the conventional device will be described. In the steelmaking process line, when the strip is subjected to continuous processing such as pickling, plating, and heat treatment, the strip travels in the direction indicated by arrow A in FIG. When the strip is sent and reaches the end, the preceding strip 12 is moved to the shear device 4 as shown in FIG.
And is stopped within the blade width 4a. In this state,
The trailing strip 13 has its tip end set to the blade width 4 of the shear device 4.
It is sent inside a and stops. Then, as shown in FIGS. 7 and 10, the back bar device 5 is retracted, and the shear device 4
Moves forward and is located between the entrance-side clamp device 2 and the exit-side clamp device 3.

Next, after the leading and trailing strips 12 and 13 are clamped by the clamp pads 17a to 17d of the respective clamping devices 2 and 3, the upper shear blade of the shearing device 4 descends to oppose the opposite end portions of the strips 12 and 13. Disconnect. Subsequently,
As shown in FIGS. 8 and 11, the shear device 4 is retracted,
The back bar device 5 moves forward and is positioned between the entrance-side clamping device 2 and the exit-side clamping device 3, and then moves the entrance-side clamping device 2 toward the exit-side clamping device 3 by a predetermined amount, and The cut surfaces of the row strips 13 are butted so that the root gap of the butted portion is a predetermined amount.

Next, the butted strips 12, 13
The welding carriage devices 7, 8 are moved and set in the inward and outward directions, that is, at right angles to the end faces of the strips 12, 13 so that the processing head 9 is positioned on the abutting portion of the strips. After preparing for welding in this way,
As shown in FIG. 9, the laser oscillator 11 is transmitted through the transmission tube 10.
The laser beam 16 oscillated by the laser beam is changed in direction by the reflection mirror 14 and is condensed by the condensing lens 15 to the abutting portions of the two strips to start welding.
The two strips 12, 13 are continuously welded by moving the strips 12, 13 in the direction of the end faces.

[0008]

However, the following points can be cited as causes of poor welding in butt welding in the above-mentioned conventional laser beam welding apparatus. In other words, if the actual values such as the laser output and the traveling speed of the processing head deviate significantly from the set values, the mechanical accuracy of the input-side clamp device, output-side clamp device, shear device, back bar device, etc. changes, For example, when oil leakage occurs.

As a countermeasure against these problems, various determination and diagnosis methods have been proposed for abnormality determination in the above case, mainly for monitoring the abnormality. However, in the case of the above, there is no appropriate countermeasure, and in each case, the operating process line is stopped, and the relevant equipment is disassembled and inspected and measured in detail.
After checking the defective part, repair was performed. In particular, the method of measuring the clearance between the upper shear blade and the lower shear blade of the double cut shear device according to the present invention (hereinafter, referred to as the "shear clearance") requires that the measuring operator use a clearance gauge in the gap between the upper shear blade and the lower shear blade. It is common practice to insert and measure, however, putting fingers between the upper shear blade and the lower shear blade is extremely dangerous and in some cases could be injured.

Further, when the above method is carried out, the process line cannot be stopped each time, and the method can be carried out only periodically, for example, on a plant holiday. It has been impossible to constantly measure the state of the shear clearance that changes minutely. Further, when welding defects due to the above-mentioned abnormal factors are detected, there is a problem that the welded strip meanders in the process line or the welded portion of the strip is broken, and the process line must be stopped for a long time. In addition, if the abnormality continues for a long period of time, there is a risk that the operation will suffer a great deal of damage.

Therefore, in order to solve the above-mentioned problems, it is necessary to obtain (a) information for each continuous welding, and (b)
To clarify the factors that cause the butted amount of the strip to be too small or too large, (c) to accurately detect the difference in the butted amount, and (d) to clarify the relationship between the change in the butted amount and the quality of the weld. Investigation such as is necessary. Of the above, (a), (b) and (d) have already been clarified or monitored, but no method of accurately detecting the difference in the matching amount in (c) has been established. Therefore, even if a laser beam welding machine abnormality occurs,
The fact that the difference in the amount of abutment between the strips became abnormal was not detected early, and it was not possible to respond quickly.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and detects a shear clearance of a double-cut shear device with high accuracy.
Method and apparatus for diagnosing shear clearance of a double-cut shear device for cutting both opposing ends of a leading strip and a trailing strip in order to prevent a strip from meandering in a process line or breaking a weld portion of the strip. The purpose is to provide.

[0013]

SUMMARY OF THE INVENTION The present invention diagnoses the 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 preceding strip and a following strip. In the method, a plurality of through holes are provided in a surface perpendicular to a line of the lower shear blade and a line of a lower shear blade mount that holds the lower shear blade, and a plurality of through holes are formed in the through holes of the lower shear blade mount. A contact type displacement meter is attached, and the clearance between the upper shear blade and the lower shear blade when the upper shear blade descends and overlaps with the lower shear blade is detected as a measured shear clearance value using the non-contact type displacement meter. The measured shear clearance value is compared with a preset reference shear clearance value to obtain a measured shear clearance deviation, and the measured shear clearance deviation is calculated. A shear clearance diagnostic method of double cut shear and wherein the determining the quality of the chromatography clearance value.

According to the present invention, two upper shear blades and two lower shear blade mounts mounted on an upper shear blade mount for simultaneously cutting both opposing ends of a preceding strip and a following strip are mounted. In a device for diagnosing shear clearance of a double-cut shear device having two lower shear blades, each of the two lower shear blades penetrates both side surfaces in a direction perpendicular to the line of the lower shear blade mounting stand. A plurality of through-holes provided, and a clearance between the upper shear blade and the lower shear blade when the upper shear blade and the lower shear blade overlap each other, being mounted in the plurality of through-holes of the lower shear blade mounting base. A non-contact type displacement meter that detects the measured shear clearance value, and an electric signal obtained by converting a signal from the non-contact type displacement meter with a converter, and The air signal is compared with a reference shear clearance value set in advance as a measurement shear clearance value to obtain a measurement shear clearance deviation, and when the measured shear clearance deviation exceeds a preset reference shear clearance deviation, an abnormality alarm is issued. And a computer for outputting the shear clearance diagnostic device of the double cut shear device.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic diagram showing an embodiment according to the present invention.
The same members as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted. As shown in this figure, the double cut shear device 20
The upper shear blade mount 21 supports the two upper shear blades 22a and 22b, and the lower shear blade mount supports the two lower shear blades 24a and 24b in opposition to the upper shear blades 22a and 22b, respectively. It consists of 23. Further, the lower shear blade mounting base 23 and the lower shear blades 24a and 24b are provided with a plurality of through holes 25a and 25b on a surface perpendicular to the line. Non-contact displacement meters 26a and 26b such as eddy current displacement meters are mounted inside the through-holes 25a and 25b on the lower shear blade mounting base 23 side.

Further, these non-contact type displacement meters 26a, 26b
And converter 27 provided outside double cut shear 20
a and 27b are connected by signal lines 28a and 28b, and the detection signals from the non-contact displacement meters 26a and 26b are converted by the converters 27a and 27b.
Is converted into an electric signal and input to the computer 30 via the signal lines 29a and 29b. The signal calculated by the calculator 30 is output via a signal line 31 and displayed on a display 32.

Here, the measurement principle of the present invention will be described. That is, each end 12 of the leading strip 12 and the trailing strip 13 is
When shearing a and 13a, first, as shown in FIG. 2 (a), both ends 12a and 13a are butted and positioned at a predetermined interval, and then, as shown in FIG. The table 21 is moved downward to lower the upper shear blades 22a, 22b, and both ends 12a, 13a are formed between the lower shear blades 24a, 24b.
2 and falls into the lower shear blade mount 23, the upper shear blade mount 21 slightly overruns downward as shown in FIG. 2 (c). Then, the upper shear blade mount 21
Operates in the reverse direction to raise the upper shear blades 22a, 22b and stop at the standby position.

FIG. 3 shows an example of a change in shear clearance at each of these stages. That is, in the stage immediately before the upper shear blades 22a, 22b and the lower shear blades 24a, 24b overlap in FIG. 2 (a), as shown in FIG. At the stage of 2 (b), it sharply decreases as shown in (b), and then the upper shear blade
When the amount of overlap with the lower shear blades 24a, 24b increases as the 22a, 22b further descends, the shear clearance has a characteristic of rapidly increasing as shown in (c).

Supplementary to this characteristic, as shown in FIG. 4, the cross-sectional shapes of the upper shear blade 22a (22b) and the lower shear blade 24a (24b) are such that the thickness of the shear blade main body portion is smaller than the thickness of the tip portion. It is generally processed. This is to prevent the tip of the strip from contacting the side surface of the shear blade when the strip is sheared, thereby preventing the side surface of the shear blade from being damaged or deforming the tip of the strip.

At the time before shearing in FIG. 5A, the upper shear blade 22a (22b) and the lower shear blade 24a (24b) have not yet overlapped, and the inner surface of the lower shear blade 24a (24b) The sheer clearance is large because its front is greatly open. However, when the upper shear blade 22a (22b) descends and overlaps with the lower shear blade 24a (24b) at the time of the shearing shown in FIG. 5B, the shear clearance becomes small. Furthermore, when the shearing of the strip is completed and the state shown in FIG. 5 (c) is reached, the shear clearance expands as compared with the shearing, and thus sharply increases.

Therefore, when shearing the above both ends 12a, 13a, the upper shear blades 22a, 22b and the lower shear blade 24
a, non-contact displacement sensor 26a Shah clearance when the 24b overlap is detected by 26b, and inputs the measured shear clearance value G _M to the computer 30. In the computer 30, the difference between the reference shear clearance value G _S which is set in advance and the measured shear clearance value G _M represents a measured shear clearance deviation .DELTA.G, calculates the following equation (1).

ΔG = G _M −G _S (1) When the measured shear clearance deviation ΔG exceeds a preset reference shear clearance deviation ΔG _S , the fact is indicated on the display 32. Output and issue an alarm. Note that the reference shear clearance deviation ΔG _S is preferably set as an upper limit of, for example, 20% of the reference shear clearance value G _S.

As described above, when the shear clearance of the double-cut shear device 20 becomes abnormal, the condition can be quantitatively measured and analyzed. Therefore, the overlapping amount of the upper shear blade and the lower shear blade can be measured. Can be detected at an early stage, and a quick response can be taken.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An application example of the present invention will be described below.
The lower shear blade mounting base 23 and the double cut shear device 20
Through holes perpendicular to the lines of the lower and lower shear blades 24a, 24b
25a and 25b are provided in 10 pieces of 5 pieces x 2 rows each.
Non-contact type displacement meters 26a, 25b are provided in the through holes 25a, 25b, respectively.
26b were attached 10 by 10 pieces. These non-contact displacement meters 26
converters 27a and 27b using signal lines 28a and 28b and signal lines 28a and 28b.
b and the converters 27a, 27b are connected to signal lines 29a,
It was connected to the computer 30 using 29b. The computer 30
Is the reference shear clearance value G _SIs 0.20mm,
The reference shear clearance deviation ΔG_S0.04mm
Each was set.

When the line is stopped, the upper shear blade 22
a, 22b and the lower shear blades 24a, 24b are replaced with new ones as day 0, and thereafter, the upper shear blades 22 are replaced for 50 days.
a, 22b and the measured shear clearance value during shearing of the lower shear blades 24a, 24b were detected. The result of calculating the difference between the measured shear clearance value and the reference shear clearance value as the measured shear clearance deviation is shown in FIG. 6 as a daily trend graph.

As can be seen from the figure, the measured shear clearance deviation changed slightly every day after the start of observation as the number of days of use elapses, but gradually increased from around 35 days, and then increased for 40 days. abnormality alarm is issued exceeds the reference Shah clearance deviation ΔG _S to the eye. Investigation of the cause revealed that the upper shear blade 22a and the lower shear blade 24a were in abnormal contact with each other for some reason, so that both blades were abnormally worn and the shear clearance was enlarged. Immediately after the occurrence of this abnormality, the line was temporarily stopped, and the upper shear blade 22a and the lower shear blade 24a were replaced. As a result, it was possible to prevent the strip from being broken due to poor welding.

[0027]

As described above, according to the present invention,
The gap between the upper shear blade and the lower shear blade is directly detected using a non-contact displacement meter to determine the measured shear clearance value,
The measured shear clearance deviation is calculated by comparing with a preset reference shear clearance value, and an abnormal alarm is issued when this measured shear clearance deviation exceeds the reference shear clearance deviation. Abnormalities in the difference in the amount of overlap of the blades can be detected early on-line, whereby the meandering of the strip and the breakage of the weld can be prevented. In addition, the welding quality of the process line welder can be maintained, and qualitatively, it has excellent effects in stabilizing the line operation and reducing the operation cost.

[Brief description of the drawings]

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

FIGS. 2A to 2C are cross-sectional views showing the operation of the double cut shear device.

FIG. 3 is a characteristic diagram showing a change in shear clearance.

FIG. 4 is an explanatory view of a shear blade.

FIGS. 5A to 5C are explanatory diagrams showing a positional relationship between an upper shear blade and a lower shear blade.

FIG. 6 is a characteristic diagram showing transition of a measured shear clearance deviation.

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

FIG. 8 is a perspective view showing an operation 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 operation state of a conventional laser beam welding device.

FIG. 11 is an explanatory diagram of an operation state of a conventional laser beam welding apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Common base 2 Inlet clamp device 3 Outlet clamp device 5 Back bar device 6 Upper head 7, 8 Welding carriage device 9 Processing head 10 Transmission tube 11 Laser oscillator 12 Leading strip 13 Trailing strip 20 Double cut shear device 21 Upper shear Blade mount 22a, 22b Upper shear blade 23 Lower shear blade mount 24a, 24b Lower shear blade 25a, 25b Through hole 26a, 26b Non-contact displacement meter 27a, 27b Converter 28a, 28b, 29a, 29b, 31 Signal line 30 Calculator 32 Display

Claims (2)

[Claims] 1. A method of 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 preceding strip and a following strip, comprising: A plurality of through holes are provided on a surface in a direction perpendicular to the line of the lower shear blade mounting table that holds the lower shear blade, and a non-contact type displacement meter is mounted in the through hole of the lower shear blade mounting table, Using the non-contact type displacement meter, the clearance between the upper shear blade and the lower shear blade when the upper shear blade descends and overlaps with the lower shear blade is detected as a measured shear clearance value, and the measured shear clearance value is determined in advance. Calculates the measured shear clearance deviation by comparing with the set reference shear clearance value, and determines whether the measured shear clearance value is good or not. Shah clearance diagnostic method of double cut shear apparatus and judging. 2. The two upper shear blades mounted on an upper shear blade mount and the two upper shear blades mounted on a lower shear blade mount which simultaneously cut both opposing ends of a preceding strip and a following strip. An apparatus for diagnosing shear clearance of a double-cut shear device having a lower shear blade, wherein the lower shear blade is provided so as to penetrate both side surfaces in a direction perpendicular to the line of the lower shear blade mount and each of the two lower shear blades. A plurality of through holes; a plurality of through holes mounted in the plurality of through holes of the lower shear blade mounting table; and measuring a clearance between the upper shear blade and the lower shear blade when the upper shear blade and the lower shear blade overlap each other. A non-contact type displacement meter for detecting as a value, an electric signal obtained by converting a signal from the non-contact type displacement meter by a converter, and measuring the electric signal A calculator that compares the calculated shear clearance deviation with a reference shear clearance value set in advance as a shear clearance value to obtain a measured shear clearance deviation, and outputs an abnormality alarm when the measured shear clearance deviation exceeds a predetermined reference shear clearance deviation. A shear clearance diagnostic device for a double cut shear device, comprising: