JP3546262B2 - Condition monitoring method of rotary shear blade of flash butt welding machine - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for monitoring a state of a rotary shear blade of a flash butt welding machine.
[0002]
[Prior art]
Conventionally, when a strip is continuously processed, it is general that the rear end of the preceding material and the front end of the following material are cut by a rotary shear and then connected by butt resistance welding using a flash butt welding machine. In this flash butt welding, a voltage is applied to the trailing edge of the preceding plate and the leading edge of the trailing plate at a very low speed, and a large current flows at the moment when both end surfaces come into contact, heating and melting the contact area, causing a spark. And an upset step in which both ends are upset by strong pressure and an upset current is applied to heat and melt.
[0003]
In such flash butt welding, when there is a large difference in the butting distance in the plate width direction, local contact occurs when the end faces are brought close to each other, and (1) the melting and heating conditions in the plate width direction are different. (2) Large current flows due to local contact of the strip, but if an overcurrent occurs that exceeds the allowable current of the electrical equipment system, welding Must be interrupted.
[0004]
Therefore, as a device for measuring the shear accuracy for cutting after strip cutting, for example, a welding machine having a shear cutting accuracy measuring device has been proposed in Japanese Patent Application Laid-Open No. 1-233073. The contents of FIG. 5 (a), between the mobile carriage 2 for gripping (b), the preceding sheet S fixed carriage 1 grasping the rear end of the ₁ and the following material S ₂ tip, the quantity type photoelectric sensor 5 consisting of the preceding material projector 5a capable of detecting a gap length or position of each strip cut surface of the rear end of the following material S ₂ the tip of the S ₁ and the light receiver 5b provided, the amount of light The type photoelectric sensor 5 is configured to travel along the traveling rail 7 along the traveling rail 7 via the connecting arm 8 by the sensor traveling driving unit 9 in the strip width direction. Reference numeral 3 and 4 electrode welding clamps the leading end of the preceding material S ₁ of the rear end and the following material S ₂ in the figure, 10 hydraulic cylinders to move the movable carrier 2, 11 is the preceding material S ₁ the rear end of the following material S ₂ tip is a rotary shear consisting of upper and lower blades for cutting respectively.
[0005]
[Problems to be solved by the invention]
However, the use of the light quantity type photoelectric sensor 5 of JP-A-1-233073 described above, measuring the gap length or position of each strip cut surface of the leading end of the preceding material S ₁ of the rear end and the following material S ₂ By doing so, it is possible to prevent troubles such as plate breakage due to poor welding, but there is a drawback that the inclination of the blade of the rotary shear 11, which is one of the root causes of deviation from the measurement standard, cannot be measured. . That is, the rotary shear 11 used here is configured by connecting two upper blades 12a and 12b and two lower blades 13a and 13b with shafts 14a and 14b as shown in FIG. If these blades are tilted with respect to the direction of travel due to backlash or wear, "burrs" will occur on the cut surface of the plate during cutting, resulting in a level difference between the preceding and succeeding materials, and welding breakage Such troubles occur.
[0006]
In order to measure the inclination of the blade, the inspector enters the machine after stopping the line, and as shown in FIG. Measurement is performed by inserting a dial gauge G between the outer surfaces. If the inclination exceeds the tolerance (for example, the reference value is 70 μm / 200 mm), it is necessary to adjust the inclination, so that the line must be stopped for a long time. Problem. In addition, when the above line is stopped, since the degree of inclination is measured while slowly moving the rotary shear, the power supply and hydraulic pressure of the machine cannot be completely turned off. I have.
[0007]
An object of the present invention is to provide a method for monitoring a state of a rotary shear blade of a flash butt welding machine which has solved the above-mentioned problems of the prior art.
[0008]
[Means for Solving the Problems]
The present invention relates to a rotary cutting device for cutting a leading end of a preceding material and a leading end of a following material in advance when welding the leading end of a preceding material and the leading end of a following material using a flash butt welding machine in a continuous strip processing line. A method of monitoring the condition of a shear blade,
A rotary butt welding rotary machine comprising: measuring a distance to an outer surface of the rotary shear blade moving by using a distance sensor installed in a movement area of the rotary shear; and calculating a degree of inclination from the measurement signal. This is a method for monitoring the state of the shear blade.
[0009]
Note that a step of measuring the distance to the outer surface of the rotary shear blade that rotates by using a distance sensor installed in a cutting area of the rotary shear and calculating the degree of runout from the measurement signal may be added. .
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view showing an outline of an embodiment of a blade state monitoring device according to the present invention, and FIG. 2 is a side view showing an attached state of a distance sensor. In these drawings, the same members as those of the conventional example are denoted by the same reference numerals, and description thereof is omitted.
[0011]
As shown in these figures, a total of four distance sensors 15a and 15b on the upper blade side and two distance sensors 16a and 16b on the lower blade side are provided on the frames of the fixed carriage 1 and the movable carriage 2, respectively. It is attached. The mounting position is an overrun area where the blades move in a non-rotating state on the opposite side of the standby position of the rotary shear 11 between the fixed carriage 1 and the moving carriage 2, and the upper blades 12 a and 12 b and the lower blades 13 a and 13 b respectively. Is positioned at a predetermined height h from the lower end thereof. Then, the perpendicularity of each blade to the traveling direction of the rotary shear 11 is measured. Note that these distance sensors are preferably of an optical type such as an eddy current type or a laser, for example.
[0012]
The measurement signals from the respective distance sensors are input to a signal processing / calculating device 17 where they are subjected to a calculating process, and it is determined whether or not the value is within a reference value (for example, 70 μm / 200 mm). Is displayed on the visual display 18. By displaying a graph using the visual display 18, the inspector can immediately recognize the degree of inclination of each blade having a high moving speed with his eyes, and can judge whether or not the inclination is during the line operation.
[0013]
Next, the measurement procedure in the blade state monitoring device configured as described above will be described as follows.
{Circle around (1)} The rotary shear 11 is operated in a state in which the rear end of the preceding material S ₁ is gripped by the fixed trolley 1, and then the leading end of the following material S ₂ is gripped by the movable trolley 2 and both ends are butted together. Then, cutting is performed while rotating the upper blades 12a and 12b and the lower blades 13a and 13b.
{Circle around (2)} When the cutting is completed, the rotary shear 11 enters the overrun area and moves horizontally with the rotation of each blade stopped.
{Circle around (3)} Each distance sensor oscillates a trigger signal to start measurement at one end when each blade passes, and sets the distance to the outer surface of each blade at a height h of, for example, 50 ms. Measurement is performed at intervals, and the signals are sequentially input to the signal processing operation device 17, and a trigger signal for ending the measurement is oscillated when the other end passes.
{Circle around (4)} The signal processing arithmetic unit 17 calculates a measurement signal from each distance sensor between the triggers, finds an approximate straight line M as shown in FIG. 3, for example, and calculates the slope of this straight line M to calculate the slope. The degree is determined, and the result is output to the visual display 18 and displayed in a graph.
(5) If there is a blade for which the calculated inclination exceeds the reference value, stop the line and adjust the installation state of the corresponding blade, or take measures such as replacement with a spare part. Do.
[0014]
The above embodiment shows an example of measurement in the overrun region in which each blade of the rotary shear 11 moves in a non-rotating state. However, as shown in FIG. If a total of four of the two distance sensors 19a, 19b on the upper blade side and the two distance sensors 20a, 20b on the lower blade side are arranged together in the area, the outer surface of each blade during rotation is arranged. Can be measured, so that the degree of run-out of each blade at the time of cutting can be measured. Further, in the measurement of the state of the blade at the time of cutting as described above, it is possible to measure the degree of inclination of the blade during actual cutting, in which factors such as runout of the blade are removed.
[0015]
【Example】
The blade condition monitoring device of Fig. 1 using an eddy current type distance sensor is set on a flash butt welding machine, and the inclination of each blade of the rotary shear in a non-rotating state is measured and determined online, and a graph is displayed on a visual display. displayed. As a result, it took about 5 minutes for one measurement and determination, but it was possible to greatly reduce the time required in comparison with the conventional required time of 60 minutes. This makes it easy to control the accuracy of the rotary shear blade, for example, about once a day.
[0016]
【The invention's effect】
As described above, according to the present invention, it is possible to automatically monitor the state of the inclination and runout of each blade of the rotary shear, so that the accuracy management of the rotary shear blade can be performed online. , Labor can be saved.
[Brief description of the drawings]
FIG. 1 is a plan view showing an outline of an embodiment of a blade condition monitoring device according to the present invention.
FIG. 2 is a side view showing a mounted state of a distance sensor.
FIG. 3 is a characteristic diagram showing an example of a measured value of a distance sensor and an approximate straight line.
FIG. 4 is a plan view showing the outline of another embodiment of the blade condition monitoring device according to the present invention.
5A is a plan view and FIG. 5B is a side view showing a conventional example of a flash butt welding machine.
FIG. 6 is a front view showing a configuration of a rotary shear.
FIG. 7 is an explanatory diagram of a conventional inclination degree measurement of a rotary shear blade.
[Explanation of symbols]
1 Fixed cart 2 Moving cart 3, 4 Electrode
11 Rotary shear
12a, 12b Upper blade
13a, 13b Lower blade
14a, 14b axis
15a, 15b Upper blade side distance sensor
16a, 16b Lower blade side distance sensor
17 Signal processing arithmetic unit
18 Visual Display
19a, 19b Upper blade side distance sensor
20a, 20b Lower blade side distance sensor

Claims (2)

When performing welding by abutting the trailing end of the leading material and the leading end of the trailing material using a flash butt welding machine in the strip continuous processing line, the blade of the rotary shear that cuts the trailing edge of the leading material and the leading edge of the trailing material in advance is used. A method of monitoring the condition,
A rotary butt welding rotary machine comprising: measuring a distance to an outer surface of the rotary shear blade moving by using a distance sensor installed in a movement area of the rotary shear; and calculating a degree of inclination from a measurement signal thereof. Monitoring method of shear blade condition. A step of measuring a distance to an outer surface of the rotary shear blade rotating and moving using a distance sensor installed in a cutting area of the rotary shear, and calculating a degree of shake from a measurement signal. A method for monitoring the condition of a rotary shear blade of a flash butt welding machine according to claim 1.

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