JPH0980030A - Method and apparatus for inspection of surface of roll by using ultrasonic waves and eddy current - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and apparatus by which an irregularity in the hardness of a roll can be simply detected. SOLUTION: A roll 4 is installed at a roll grinding machine 2 so as to be rotatable, and a signal is sent out to a flaw detector body 1 at every rotation. A carraige 2a at the grinding machine 2 is installed so as to be movable right and left by a bed 2b, and the state of its right and left movement is sent out to the flaw detector body 1 as a traverse signal. A probe 3 which inspects the state on the surface of the roll installed at the carriage 28 is installed so as to be freely brought close and separated with reference to the surface of the roll 4. Normally, the probe is separated from the surface of the roll 4. However, by an electric signal from the flaw detector body 1, its contact face is pressed to the surface of the roll 4 under a prescribed pressure in a flaw detection. An ultrasonic transmission-reception part 3a is installed in the interior of the probe 3, a detection coil part 3c which detects an eddy current on the roll 4 is installed, and its electric signal is sent out to the flaw detector body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for inspecting the surface of a rolling roll using ultrasonic waves and eddy currents, and more specifically, it automatically detects flaws on the surface of the rolling roll on a grinding machine. A rolling roll inspection method and apparatus for recording and determining pass / fail, characterized by detecting flaws from both ultrasonic flaw detection and eddy current flaw detection And equipment.

[0002]

2. Description of the Related Art Conventionally, an ultrasonic probe is brought into contact with the surface of a rolling roll provided on a roll grinder, and the rolling roll is rotated to spirally scan the probe for flaw detection on the roll surface. Techniques to be performed are known as Japanese Patent Laid-Open Nos. 5-142215 and 5-281213. A technique for detecting flaws with an eddy current is disclosed in Japanese Unexamined Patent Publication
-35158, JP-A-3-2373548, etc. are known.

In the former ultrasonic flaw detection technique, cracks can be accurately measured without being affected by uneven hardness and residual magnetism. However, if the roll has uneven hardness, it partially becomes 100 ° or more in the heat treatment process, and a soft portion is partially formed on the roll, which results in deformation during use of the roll. Such hardness unevenness cannot be measured by the technique of ultrasonic flaw detection. On the other hand, the latter flaw detection technique using eddy current can detect hardness unevenness (structure unevenness), but at the same time, also detects cracks and residual magnetism.

[0004]

According to the above-mentioned prior art, the residual magnetism can be eliminated by detecting only the actual change of the magnetic lines of force by the self-comparison detecting coil. It is impossible to discriminate between cracks and uneven hardness even if the technique is used, and a method and apparatus for detecting this uneven hardness are desired. In view of the above-mentioned circumstances, an object of the present invention is to provide a method and an apparatus capable of easily detecting hardness unevenness.

[0005]

The first aspect of the present invention is a rolling roll surface inspection method using ultrasonic waves and eddy currents, in which detection data by ultrasonic flaw detection and eddy current flaw detection are obtained, and both detection data are obtained. It is characterized in that the surface of the rolling roll is judged by the positional superposition and the superposition data and the non-superposition data.

Because of this structure, cracks are detected in ultrasonic flaw detection, and cracks and scratches of uneven hardness are detected in eddy current flaw detection. A crack is shown at the same position,
When the cracks are removed, the hardness unevenness data is obtained.

Further, it is preferable that the operation check is performed before the flaw detection operation is started, and a warning is given when the inspection operation is not performed. With this configuration, since there is an alarm means for detecting the presence / absence of a signal from the scanning means and the presence / absence of transmission of the oscillator by detecting the voltage across the bridge circuit, the alarm means is provided. In the case of a signal different from the normal flaw detection state, an alarm can be issued, and wasteful flaw detection can be prevented.

Further, it is preferable that the threshold value is changed and data processing is performed after the flaw detection data is detected. With this configuration, it is possible to change the threshold value and separately rank the measured materials.

The second aspect of the present invention is a rolling roll surface inspection apparatus using ultrasonic waves and eddy currents, wherein detection data obtained by ultrasonic flaw detection and eddy current flaw detection are obtained, and the detection data of both are positionally superposed. The feature is that the surface of the rolling roll is determined based on the polymerization data and the non-polymerization data.
Grinding means for grinding the rolled object, scanning means for scanning the surface of the object to obtain surface information in synchronization with a grinding end signal of the grinding means, rotation detecting means for detecting rotation of the object, The ultrasonic flaw detection is provided by the operation means, including a calculation determination means for receiving a signal from the flaw detection means and the rotation detection means to calculate a flaw detection state and determining a calculation result, and a display means for displaying a result of the calculation determination means. And the eddy current flaw detection data are obtained, the superposition data and the non-superposition data are obtained by the calculation determining means, and the surface of the rolling roll is inspected.

Because of this structure, cracks are detected in ultrasonic flaw detection, and cracks and unevenness in hardness are detected in eddy current flaw detection. A crack is shown at the same position,
When the cracks are removed, the hardness unevenness data is obtained.

Further, it is preferable to provide an alarm means for detecting the presence or absence of an input signal from the scanning means and sending an alarm signal. With such a configuration, there is provided an alarm means for detecting the presence / absence of a signal from the scanning means and the presence / absence of transmission of the oscillator by detecting the voltage across the bridge circuit, and transmitting an alarm signal. Therefore, if the signal is different from the normal flaw detection state, an alarm can be issued, and useless flaw detection can be prevented.

Further, there is provided a scanning means which is stored in the grindstone moving base of the roll grinder during grinding, contacts the object in synchronism with the end of grinding, and is returned and stored in the grindstone moving pedestal in synchronism with the end of flaw detection. It is preferable to configure. With this configuration, the probe does not contact the roll surface during grinding,
Does not get soiled by grinding debris or grinding water during grinding.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to an embodiment shown in the drawings. However, the dimensions, materials, shapes, relative positions, etc. of the components described in this embodiment are merely illustrative examples, without any intention of limiting the scope of the present invention thereto unless otherwise specified. Absent.

FIG. 1 is a system configuration diagram of an apparatus used for inspecting a rolling roll according to an embodiment of the present invention, FIG. 2 is an embodiment of a probe, and FIG. 3 is a basic view of a flaw detector main body. 4 is a functional block diagram showing a typical configuration, FIG. 4 is an ultrasonic basic waveform diagram,
5 is a diagram showing an ultrasonic flaw detection screen, FIG. 6 is a diagram showing an eddy current flaw detection screen, FIG. 7 is a diagram showing a screen in which both ultrasonic flaw detection and eddy current flaw detection screens are superimposed, and FIG. FIG. 9 is a flow chart showing an operating state of the child, FIG. 9 is a flow chart showing an ultrasonic flaw detection state,
10 is a flow chart showing an eddy current flaw detection state, and FIG. 11 is a flow chart showing flaw determination.

In FIG. 1, the roll 4 is a roll grinder 2
Is rotatably provided, and a signal is sent from the terminal T1 of the grinder 2 to the flaw detector main body 1 via the signal line 5 every rotation. The carriage 2a of the grinder 2 is provided so as to be movable left and right by the bed 2b, and the state of the left and right movement is sent to the flaw detector main body 1 from the terminal T2 of the grinder 2 via the signal line 7 as a traverse signal. It is configured.

The grindstone portion 2d provided on the carriage 2a has a grindstone provided inside so as to face the surface of the roll 4,
The movement of the roll 4 in the core direction can be moved back and forth by a mechanism not shown, and the movement in the direction parallel to the core can be moved left and right by a mechanism not shown. The left-right movement and the forward-backward movement are controlled by a control device (not shown) provided in the grinding machine 2.

The probe 3 provided on the carriage 2a for inspecting the state of the surface of the roll is provided so as to be movable toward and away from the surface of the roll 4. The probe 3 is normally separated from the surface of the roll 4, but the contact surface thereof is a predetermined pressure at the time of flaw detection due to an electric signal from the flaw detector main body 1 through the signal line 8. Is pressed by. An ultrasonic wave transmitting / receiving section 3a is provided inside the probe 3, and the presence / absence of a flaw is detected by receiving the reflected wave of the ultrasonic wave transmitted from the transmitting / receiving section 3a. This received signal is configured to be sent to the flaw detector main body 1 via the signal line 6.

Further, the probe 3 has a roll end detector 3b.
The roll end detection unit 3b is for detecting whether or not the probe 3 is on the roll 4, and its electric signal is sent to the flaw detector main body 1 through the signal line 9. It is configured. Further, the probe 3 is provided with a detection coil section 3c for detecting an eddy current (hereinafter referred to as an eddy current) on the surface of the roll 4, and an electric signal thereof is sent to the flaw detector main body 1 through a signal line 19. Is configured. The signal line 10 is for sending out that the probe 3 is operating normally as a set completion signal from the flaw detector main body 1 to the grinder 2 as described later.

The flaw detector main body 1 is provided with an FD (floppy disk) insertion port 1e, and an FD in which flaw detection conditions are stored is inserted, and the ten-key 1b is operated to complete the preparation for flaw detection scanning. The lamps 1f to 1i are turned on by an abnormality input signal from the tentacle 3 to notify the abnormality. In addition, the transmitter / receiver 3a and the roll 4
The input signal of the number of rotations is received, the internal CPU (central processing unit) calculates, and the flaw detection data is obtained from the calculation result on the main screen 1
c and the dummy screen 1d are drawn and stored in the FD, and the print data can be ejected by the printer 1a.

FIG. 2 is a diagram showing an embodiment of the probe 3. In the same figure, an ultrasonic wave transmitting / receiving section 3a and a detection coil section 3c for detecting an eddy current are provided in the housing 39, and the ultrasonic wave is obliquely inclined to the surface of the roll 4 at the bottom of the ultrasonic wave transmitting / receiving section 3a. A vibrator 36 is provided to transmit and receive, and a movable plate 34A is provided at the front end portion in the transmission direction thereof so as to be vertically movable by being pressed against the surface of the roll 4 by a spring. The blower pipe 32 is provided in front of and in proximity to the movable plate 34.

On the other hand, behind the vibrator 36 are provided a supply pipe 33 for supplying a contact medium and a movable plate 34B for removing grinding water and dust. The contact medium is supplied in synchronism with the end of grinding, but the ultrasonic wave transmitted from the vibrator 36 is propagated between the tip of the supply pipe 33 and the movable plate 34A inside the roll surface without passing through the air layer. To be filled. Leakage of the contact medium from the movable plate 34A is prevented by the air curtain by the blower pipe 32, and an ultrasonic wave transmission path is secured.

The transmitter / receiver 3a is configured to contact the surface of the roll 4 via four guide rollers and scan by rotating the roll 4 in the direction of the arrow. Monitor section 3
The arm 38 of b is provided in a part of the housing 39, and the monitor water is supplied by a pipe (not shown).
The cleaning water is supplied from b to the surface of the roll 4 as cleaning water, and the surface of the roll can be cleaned in cooperation with the movable plate 34B during flaw scanning. This monitor water is common with the couplant, and a part of it is supplied to the couplant supply pipe 33 via the pipe 38a. An optical sensor 38c is provided on the arm 38, and is configured to send a signal immediately before the probe 3a deviates from the end of the roller 4 in the longitudinal direction. Further, the casing 39 is provided on a connecting arm (not shown), and is configured to be able to come into contact with and separate from the surface of the roll 4 under the control of the grinder 2 or the sequencer 13.

The self-comparing detection coil 4 is provided in the detection coil section 3c provided behind the housing 39 for detecting the eddy current.
0a and 40b are provided, and a blower pipe 31 and a movable plate 34C that remove grinding dust are provided. The electric signal of the detection coil is connected to the flaw detector main body 1 through a signal line 19.

FIG. 3 is a functional block diagram showing the basic construction of the flaw detector main body. In the figure, the sequencer 1
3 is a lamp 1f that lights up when ultrasonic waves are not transmitted,
A lamp 1g that lights up when the contact medium is not supplied, a lamp 1h that lights up when the probe 3 deviates from the longitudinal end of the roll as described later, and a transmitter (not shown) provided in the eddy current flaw detector emits light. Lamp 1 that lights up when not in use
i is connected and the grinder 2 is connected via the signal line 10.
And a signal line 8 to output an output signal to the arm 2e of the grinder 2 (FIG. 1).

The connecting arm 2e operates according to a command from the grinder 2 in a normal operation, but when an abnormality occurs, the signal line 8
It is also possible to operate by a command from the sequencer 13 via the. The scanning signal of the ultrasonic wave transmitting / receiving section 3a of the probe 3 provided on the arm 2e is connected so as to be sent to the CPU (central processing unit) 12 via the interface 18.

On the other hand, the scanning signal is also connected to the abnormality detecting means 17, and the roll end detecting portion 3b of the probe 3 is also connected to the abnormality detecting means 17. The detection coil unit 3c is connected to the eddy current flaw detector 20, and the flaw detector 20 is connected to the abnormality detecting means 17 and also to the CPU 12 via the interface 18. The output terminal of the abnormality detecting means 17 is connected to the sequencer 13, and the above-mentioned alarm lamps 1f, 1 are generated by the abnormality output signal.
It is configured to turn on g, 1h, and 1i.

The eddy current flaw detector 20 includes a transmitter, a bridge, an automatic balancer for the bridge, a phase shifter, a bridge output amplifier, a synchronous detector, a filter, a rejection circuit, an amplitude discrimination circuit, and a bridge circuit (not shown). A transmission detection circuit or the like for detecting the presence or absence of transmission of the transmitter by detecting the voltage at both ends is provided, and is configured to detect flaws on the roll surface.

In addition to the numeric keypad 1b, the CPU 12 outputs the output end of the interface 18, the output end of the roll speed detecting means 14 and the output end of the traverse signal generating means 15 provided on the grinder 2 (FIG. 1), the printer 1a, Display device 1
c, connected to the storage device 1e, the interface 11,
Information of the interface 18 and the roll rotation number detecting means 14 is calculated, and the calculation result is stored, displayed, and recorded by a printer.

Further, the CPU 12 is connected with a memory 21 for storing ultrasonic flaw detection result data and a memory 22 for storing eddy current flaw detection result data, and these memories are configured so that data can be obtained via the interface 18. ing. The data recorded in the memories 21 and 22 is recordable in the memory 23 as superposition data of ultrasonic flaw detection and eddy current flaw detection. Also, CP
A ROM 26 storing various programs is connected to U12.

FIG. 4 shows the transmitting / receiving section 3a appearing on the main screen 1c or the dummy screen 1d of the flaw detector body 1 shown in FIG.
FIG. 3 is a basic waveform diagram of ultrasonic waves transmitted and received by the. Now, when the transducer 36 of FIG. 2 transmits an ultrasonic wave, the signal waveform thereof enters the flaw detector main body 1 through the signal line 6 of FIG. 1, and when the gate G1 for receiving the signal waveform is opened, T of FIG. Draw the transmitted wave waveform on the screen. If the gate G2 is opened after the time when the waveform of T is formed, the ultrasonic waves partially reflected on the surface of the roll 4 in the vicinity of S in FIG. 2 can be received.

The remaining ultrasonic waves reflected at the position of S enter the inside of the roll 4 and receive the reflected wave reflected if there is a crack in the roll 4 on the surface of the roll 4 while the gate G2 is open. Then, the time and intensity at that time are calculated and displayed on the screen. If the reflected wave cannot be caught while G2 is open, no waveform appears on the screen. On the other hand, the ultrasonic waves propagating through the space are the monitor water 38d.
When the gate G3 is opened later than the time when the gate G2 is opened, the gate G3 is caught by it and the waveform of M is drawn.

It is detected that the ultrasonic waves are transmitted and the contact medium is supplied by detecting these waveforms T and M, but if they cannot be caught within a predetermined time, the flaw detection of FIG. The ultrasonic wave is not transmitted by the lamp 1f provided in the main body 1 or the lamp 1g
Warns that no couplant is supplied. If a flaw signal of a predetermined level or higher is caught while the gate G2 is open, the waveform of the defect echo of F appears, and the roll 4 is rotating, so the F waveform moves from left to right.

Next, the operation of this embodiment constructed as described above will be explained. FIG. 5 is a flow chart for checking the operating state of the probe. When the flaw detector main body 1 is turned on, the CPU 12 starts operation from step (100). The three-digit number in parentheses below indicates the step number.
First, check if there is a flag on the initial menu (10
1) is done. In this initial menu, the following menus can be selected. 1. Read files recorded in the past 2. New entry / registration 3. Immediate flaw detection 4. Default value setting / change / update 5. Signal level test

1.2.3. Of the above initial menu. When is set, a flaw detection menu of mode 0 (holding), mode 1 (waiting for flaw detection), mode 2 (forward flaw detection), and mode 3 (reverse flaw detection) can be selected. When mode 0 is selected, 1) return to the initial menu, 2) record on FD, 3) print on the printer,
4) The threshold value 2 can be changed. For the scratch determination, a certain amount of truncation is performed at the threshold value 1. If this setting is set too low, normal surfaces will be judged as scratches, and if 3,000 or more scratches are detected by forward flaw detection, the program will overflow. Determined by the signal level test,
The detailed explanation is omitted here. The threshold value 2 is a level at which a flaw is determined among the flaws detected by the threshold value 1, and this setting can be changed in the mode 0 state.

Initial menu 4. Default setting / change /
When update is selected, the flaw detection pitch, the same flaw determination distance, the traverse direction, threshold values 1 and 2, the maximum number of flaw recordings, and the like can be set. Here, the same flaw determination distance is a double scan method in which the reciprocating distance of the roll is scanned in the present embodiment, and a flaw at the same position is determined as a flaw in both of these scans. It is determined in consideration of an absolute error in the method and the eddy current flaw detection method and a range in which a single flaw or a plurality of flaws may be judged as flaws within a predetermined area range. The traverse direction is to specify one of the double scans, but normally both are specified.

When the setting of the initial menu is completed (10
2), the mode is incremented from 0 to 1, and the carriage position return signal is waited (103). When a switch (not shown) provided on the grinder 2 is turned on, the roll 4 starts to rotate, the grindstone portion 2d comes into contact with the surface of the roll 4, starts grinding, and starts moving leftward in FIG. Grinder 2
When the traverse of the carriage 2a is stopped, the grindstone is separated from the roll surface, and the traverse signal generating means 15 sends an inversion signal to the CPU 12 and the sequencer 13 as a carriage position return signal (FIG. 3). Sequencer 13 is arm 2
By driving e, the probe 3 is brought into contact with the roll 4, and monitor water and air are supplied to the surface of the roll 4.

When the carriage position return signal is input (103),
The process proceeds to the determination (104) as to whether ultrasonic waves are being transmitted. If the transmission / reception section 3a does not detect the transmission, the abnormality detection means 17 turns on the lamp 1f via the sequencer 13 to give a warning of no transmission (105). When the transmission is detected, the process proceeds to a judgment (106) as to whether or not the contact medium is supplied. If the monitor signal is not detected by the transmitter / receiver 3a, the abnormality detecting means 17 causes the sequencer 1 to operate.
The lamp 1g is turned on via 3 and a warning that the contact medium cannot be supplied is issued (107).

When the monitor signal is input, the process proceeds to a determination (108) as to whether the transmitter of the eddy current flaw detector 20 is transmitting. When no transmission is detected by the transmission detection circuit of the eddy current flaw detector 20, the lamp 1i is lit by the abnormality detection means 17 via the sequencer 13 and no transmission signal warning is given (109).
Is done. When the transmission is detected, the sequencer 13 sends a setting completion signal to the grinder 2 via the signal line 10 (11
0). In response to the setting completion signal, the grinder 2 traverses the carriage 2a.

Next, the ultrasonic flaw detection state and flaw determination will be described with reference to FIGS. 6 and 10. FIG. 9 is a flowchart showing an ultrasonic flaw detection state. In the figure, when the carriage 2a starts and a traverse start signal is input (11
1), the mode is added from 1 to 2 (112). If the mode is not 0 (113), the process proceeds to checking the roll speed signal (114). The counter in the CPU 12 calculates the Y position, which is the direction of roll rotation, by counting from the time when the first roll rotation speed signal is input, but when the roll rotation speed signal is input, the Y position counter is reset. Then, the X position counter counts (115) and the process proceeds to step D. After step D, ultrasonic flaw detection and eddy current flaw detection are performed after a predetermined angle delay. First, ultrasonic flaw detection will be described.

Although the ultrasonic reflected signal is taken in (116), the reflected signal is taken even when the traverse start signal and the roll speed signal do not come in, and the XY position of the flaw and the XY position on the screen are detected. The calculation is (117). The scratch signal smaller than the threshold value 1 is displayed on the numeric keyboard 1 of FIG.
When #U is input by b to instruct the display for ultrasonic flaw detection (122), it is displayed on the dummy screen 1d (123). If there is no such instruction, the dummy memory 24
(124).

If the display value for ultrasonic flaw detection is instructed if it is not smaller than the threshold value 1, (11
9) It is drawn on the main screen 1c (120) and stored in the memory 21 (121). When a program overflows or there is too much data and a suspend signal is input from the numeric keyboard 1b, the data disappears and returns to A, the carriage 2a returns to the initial position, and the threshold level is reached. However, if there is no interruption signal, the process returns to B.

On the other hand, in FIG. 2, since the roll 4 rotates clockwise, eddy-current flaw detection is performed at the place where the ultrasonic flaw detection is performed with a delay of a predetermined angle from the ultrasonic flaw detection. Therefore, in step D of FIG. 9, the eddy current flaw detection shown in FIG. 10 is performed. Capture the detection coil signal (12
6), the XY position of the scratch and the XY position on the screen are calculated as (1
27) is performed. A flaw signal smaller than the threshold value 1 is displayed on the dummy screen 1d (133) by inputting #E on the numeric keyboard 1b in FIG. 1 to instruct the display display for eddy current flaw detection (132). If there is no instruction, it is recorded in the dummy memory 25 (134).

If the display value for eddy current flaw detection is instructed if it is not smaller than the threshold value 1 (129),
It is drawn on the main screen 1c (130) and stored in the memory 22 (131). Program overflows,
When there is too much data and an interrupt signal is input from the numeric keyboard 1b, the data disappears and returns to A.
The carriage 2a is returned to the initial position, the threshold level is changed, and restarted, but if there is no interruption signal, the process returns to B.

In FIG. 9, when the forward movement of the traverse ends, the backward movement starts, and an inversion signal is input, the mode is added to 3, and the steps (114) to (135) are passed to (11).
Returning to 1), the carriage 2a returns to the initial position, a traverse return signal is input, and the mode returns to 0. When the mode is 0, the process proceeds to step C (113).

FIG. 11 is a flow chart showing the scratch judgment. In the figure, the process proceeds to a step (136) for judging the presence / absence of a change flag of threshold 2. If there is a change signal, it is selected (138) whether or not the signal has a threshold value of 2 or more, the flaws at the same position are detected by reciprocating (139), and the signals are rearranged in descending order of the signal level (140) and are in a short distance. It is determined (141) whether or not the wounds are the same, the position on the screen and the diameter of the display circle are calculated (142), the graphic and numerical table of the determination result are prepared (143), and stored in the memory 23 (144). ), A determination completion signal (145) is sent to the grinder 2 and the process returns to A.

The screens for roll number, diameter, length, ultrasonic and eddy current threshold values, same flaw judgment width, total number of flaws and ultrasonic and eddy current flaw detection are recorded in the memories 21, 22 and 23. These are the types of data to display The screen drawn on the main screen 1c is as shown in FIG. 5 for the ultrasonic flaw detection screen 40A, as shown in FIG. 6 for the eddy current flaw detection screen 40B, and as shown in FIG. 7 for the superimposed ultrasonic flaw detection and eddy current flaw detection screen 40C. . Figure 7
, The white circles represent the flaw position by ultrasonic flaw detection, the white corners represent the flaw location by the eddy current flaw detection, and the black circles represent the flaw location where the two overlap. A crack is measured by the position of the scratch thus polymerized. This data is recorded in the memory 23 together with the above-mentioned data. Also, these data are recorded in the magnetic recording means 1e.

Now, the grinder 2 which has received the judgment completion signal,
The probe 3 is raised by the connecting arm 2e to return to the initial position. At this time, the optical sensor 3 of the roll end detection unit 3b
Since the monitoring range of 8c is out of the roll surface, the lamp 1h is turned on via the sequencer 13 by the output signal of the abnormality detecting means 17. Since the optical sensor 38c monitors the leading end of the roll, it detects the leading end of the roll automatically even if the program overflows and the carriage 2a is moving, without depending on the determination completion signal. It is useful as a safety device that removes the probe 3 upward from the roll surface. In this case, if necessary, a plurality of optical sensors may be used to share the ends of the rolls for monitoring.

The embodiment according to the present invention is not limited to the above-mentioned one. For example, the alarm may be issued not only by the lamp but also by the buzzer, and the buzzer sounds when the lamp is turned on to warn. It's okay.
Further, in the present embodiment, a value smaller than the threshold value SH1 is also stored in the dummy memory, so that it is possible to visually recognize how small scratches are, although it does not substantially affect.

Then, in the case of ultrasonic flaw detection when the dummy memory overflows, the output of ultrasonic waves is lowered,
In the case of eddy current flaw detection, the flaw signal input is lowered by operating a filter circuit or the like for adjustment. However, specifically, steps (122) to (124) and (132) are performed so that a value smaller than the threshold value SH1 is not captured.
(134) may not be provided.

In the present embodiment, the surface of the subject is scanned to obtain surface information, rotation information of the subject is obtained, and the flaw detection result calculated by the computer from these information is stored in the magnetic recording means. Because it is done, it can be regenerated and used at any time. In addition, the scratch level can be easily set again,
Data storage and management can be done in a small space.

Further, since the flaw detection information is obtained from the surface information obtained by reciprocally scanning the surface of the subject in the longitudinal direction and the data obtained by comparing each of the data, and the rotation information of the subject, Compared with the data obtained by scanning only, it is less likely that the false flaw data due to the mixture of grinding dust will appear at the same position where the reciprocal scanning is performed, and accurate flaw detection can be performed.

Further, after confirming that the scanning means is operating normally based on the information obtained by the initial scanning of the subject, the subsequent full-scale flaw detection scanning is performed.
The scanning means does not continue to scan abnormally due to insufficient injection of the contact medium, etc., and it is possible to prevent wasteful flaw detection due to malfunction of the transmitter of the eddy current flaw detector.

Further, since the monitoring means for monitoring the subject detects just before the scanning means deviates from the surface of the subject, and the scanning means is separated above the surface of the subject, the flaw detection is stopped or interrupted. By this, the scanning means is prevented from deviating from the surface of the subject, and the scanning means is prevented from being damaged by interference between the scanning means and the surface of the subject during subsequent scanning.

Further, since the present embodiment has the display means for displaying the result of the calculation determining means for calculating and determining the flaw detection state by receiving the signals from the flaw detecting means and the rotation detecting means, the calculation determination result is visually checked. can do.

[0055]

As described above, the present invention obtains the detection data by ultrasonic flaw detection and eddy current flaw detection, positionally superposes the detection data of both, and the rolling roll surface is obtained by the superposition data and the non-superposition data. Since it is determined that the hardness unevenness data can be easily obtained by carrying out position polymerization of both.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of an apparatus used for inspecting a rolling roll according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of a probe.

FIG. 3 is a functional block diagram showing a basic configuration of a flaw detector main body.

FIG. 4 is an ultrasonic basic waveform diagram.

FIG. 5 is a diagram showing an ultrasonic flaw detection screen.

FIG. 6 is a diagram showing an eddy current flaw detection screen.

FIG. 7 is a diagram showing a screen in which both screens of ultrasonic flaw detection and eddy current flaw detection are superimposed.

FIG. 8 is a flowchart showing an operating state of the probe.

FIG. 9 is a flowchart showing an ultrasonic flaw detection state.

FIG. 10 is a flowchart showing an eddy current flaw detection state.

FIG. 11 is a flowchart showing scratch determination.

[Explanation of symbols]

1 Flaw Detector Main Unit 2 Roll Grinder 3 Probe 4 Roll 5, 6, 7, 8, 9, 10 Signal Line 11, 18 Interface 12 CPU 13 Sequencer 14 Roll Rotation Detecting Means 15 Traverse Signal Generating Means 17 Abnormality Detecting Means 20 Eddy Current Flaw Detector 21-25 Memory 26 ROM 31, 32 Blower Tube 33 Contact Medium Supply Tube 34 Movable Plate 36 Transducer 38 Arm 39 Case F Defect Echo M Monitor Reflected Wave from Water S Partly Reflected Wave from Roll Surface Transmission wave from T oscillator

Claims (6)

[Claims] 1. A method for obtaining the detection data by ultrasonic flaw detection and eddy current flaw detection, positionally superposing the detection data of both, and judging the surface of the rolling roll by superposition data and non-superposition data. Roll roll surface inspection method using sound waves and eddy currents. 2. The surface inspection of a rolling roll using ultrasonic waves and eddy currents according to claim 1, wherein the operation of the probe is checked before the flaw detection operation is started, and a warning is given when it is not operating. Method. 3. The method for inspecting the surface of a rolling roll using ultrasonic waves and eddy current according to claim 1, wherein the threshold value is changed and data processing is performed after detection of flaw detection data. 4. An ultrasonic wave and an eddy current for determining a rolling roll surface by obtaining detection data by ultrasonic flaw detection and eddy current flaw detection, positionally superposing the detection data of both, and superposing data and non-overlap data. A rolling roll surface inspection apparatus used, comprising: grinding means for grinding a roll-shaped object; scanning means for scanning the surface of the object to obtain surface information in synchronization with a grinding completion signal from the grinding means; Rotation detecting means for detecting the rotation of the detecting means, operation determining means for receiving the signals from the flaw detecting means and the rotation detecting means to calculate the flaw detection state and determining the operation result, and display means for displaying the result of the operation determining means. And ultrasonic wave flaw detection and eddy current flaw detection data are obtained by the operating means, and the superposition data and non-superposition data are obtained by the calculation determining means to determine the surface of the rolling roll. And a rolling roll surface inspection apparatus using ultrasonic waves and eddy currents. 5. A rolling roll surface inspection apparatus using ultrasonic waves and eddy currents according to claim 4, further comprising alarm means for detecting the presence or absence of an input signal from the scanning means and transmitting an alarm signal. . 6. A scanning means is provided, which is stored in a whetstone moving base of a roll grinder during grinding, contacts the object in synchronization with the end of grinding, and returns and is stored in the whetstone moving base in synchronization with the end of flaw detection. The rolling roll surface inspection device using ultrasonic waves and eddy currents according to claim 4.