JP2008122090A - Ultrasonic flaw detection method of rod material, and ultrasonic flaw detection system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultrasonic flaw detection method capable of detecting accurately the positions of defects in a rod material R, and to provide an ultrasonic flaw detection system used for the method. <P>SOLUTION: This ultrasonic flaw detection method of the rod material R has a process for making the rod material R support on stands 30 arranged inside a liquid tank 10; a process for gripping one end of the supported rod material R by a chuck 14, and arranging a probe 94 operable so as to transmit ultrasonic waves toward the rod material R and to receive a reflected component of the ultrasonic waves, near the outer circumferential surface of the rod material R; a process for rotating the rod material R by making the chuck 14 rotate, moving the probe 94 in the axial direction of the rod material R at a prescribed movement timing, in matching with rotation of the chuck 14; whereas the probe 94 is operated at a prescribed operation timing, in matching with the rotation of the chuck 14; and a process for detecting the defects of the rod material R, based on the reflected component received at each operation time of the probe 94. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an ultrasonic flaw detection method for a rod material and an ultrasonic flaw detection system used in the method.

A rod material ultrasonic inspection method (ultrasonic flaw detection method) is widely known as a method for detecting defects in a rod material. For example, Patent Document 1 discloses an ultrasonic flaw detection method for a bearing rope. According to this ultrasonic flaw detection method, a round bar to be inspected is supported by a roller in the water tank, and the round bar is rotated by driving this roller with a motor. A probe is disposed in the vicinity of the round bar, and the probe transmits an ultrasonic wave to the round bar and receives a reflected component of the ultrasonic wave. The received signal is input to the flaw detector, and the flaw detector detects the size of the inclusion as a defect and outputs it to the personal computer. On the other hand, the personal computer controls the rotational angle of the roller and the position of the probe in the axial direction of the round bar via the motor controller, thereby controlling the positional relationship between the probe and the round bar.
International Publication No. WO2003 / 060507 Pamphlet

In the conventional ultrasonic inspection method for the bearing steel, slip may occur between the round bar and the roller during rotation of the roller. When slipping occurs, even if a defect in the round bar is detected, the position of the defect in the circumferential direction of the round bar is not accurately specified.
Also, in this flaw detection method, when inspecting the part of the round bar that is in contact with the roller, the probe receives noise from the roller according to the diameter of the round bar and the offset amount of the probe. Therefore, the presence of inclusions cannot be accurately detected.

  The present invention has been made in view of such a problem, and an object thereof is to provide an ultrasonic flaw detection method in which the position of a defect in a rod material is accurately detected, and an ultrasonic flaw detection used in the method. To provide a system.

  According to the present invention, the supporting device disposed in the liquid tank supports the rod material rotatably around the axis of the rod material, and chucks one end of the rod material supported by the supporting device. And placing a probe operable to transmit an ultrasonic wave toward the rod material and receive a reflected component of the ultrasonic wave in the vicinity of the outer peripheral surface of the rod material, and The rod material is rotated by rotating the chuck, and the probe is moved in the axial direction of the rod material at a predetermined movement timing in accordance with the rotation of the chuck. A step of operating the probe at a predetermined operation timing, and a step of detecting a defect of the rod material based on the reflection component received at each operation of the probe; Ultrasonic flaw detection method of the moving member, characterized in that it comprises is provided (claim 1).

Preferably, the support device includes three or more stands arranged along the axis of the rod material, and is near one of the stands as viewed in the axial direction of the rod material. Prior to operating the probe, the one stand is separated from the rod material, and the rod material is supported by the remaining stands (Claim 2).
Preferably, the support means further includes a plurality of pinch rollers arranged along an axis of the rod material, and when viewed in the axial direction of the rod material, one of the pinch rollers among the pinch rollers. Prior to operating the probe in the vicinity of, the one pinch roller is separated from the rod material, and the axial deviation of the rod material is regulated by the remaining pinch rollers.

  In order to achieve the above object, according to the present invention, the support device is disposed in the liquid tank and supports the rod material rotatably about the axis of the rod material, and is supported by the support device. A chuck for gripping one end of the rod material, and a probe disposed near the outer peripheral surface of the rod material and operable to transmit an ultrasonic wave toward the rod material and receive a reflected component of the ultrasonic wave A rotating device for rotating the rod material by rotating the chuck, a moving device for moving the probe in the axial direction of the rod material at a predetermined timing with respect to the rotation of the chuck, A detector that operates the probe at a plurality of operating positions relative to the rod material, and detects defects in the rod material based on the reflection component at each operating position. Ultrasonic testing system of the rod material is provided, characterized in that (claim 4).

  In the rod flaw ultrasonic inspection method according to the first aspect of the present invention, since the rod material is rotated by rotating the chuck, the rotation of the chuck and the rotation of the rod material are completely synchronized. Therefore, the rotation of the rod material and the operation timing of the probe do not deviate from the setting. As a result, according to this flaw detection method, the position of the detected defect in the rod material can be accurately grasped.

In the ultrasonic inspection method for the rod material according to the second aspect, by separating the stand in the vicinity of the probe, the ultrasonic wave is prevented from being reflected by the stand, and the superimposition of noise on the reflection component is prevented. As a result, according to this flaw detection method, the presence of defects in the rod material is reliably detected.
According to the ultrasonic inspection method for the rod material of the third aspect, since the shaft material of the rod material is prevented by the pinch roller, the position of the defect can be grasped more accurately. On the other hand, since the pinch roller near the probe is separated from the rod material, the movement of the probe is not hindered by the pinch roller.

  In the ultrasonic inspection system for the rod material according to the fourth aspect, since the rod material is rotated by rotating the chuck, the rotation of the chuck and the rotation of the rod material are completely synchronized. Therefore, the rotation of the rod material and the operation timing of the probe do not deviate from the setting. As a result, according to the flaw detection system, the position of the detected defect in the rod material can be accurately grasped.

FIG. 1 is a side view of an ultrasonic flaw detection system according to an embodiment of the present invention, and a part of the flaw detection system is shown in a cross section for explanation.
This ultrasonic flaw detection system is applied to the inspection of the cylindrical rod material R, and is suitably used for the inspection of the material of the shaft of the aircraft engine. Specifically, according to the ultrasonic flaw detection system, the presence or absence and the position of a defect such as a void, a crack, and an inclusion in the rod material R are detected. In the case of aircraft engine shaft materials, only materials that pass inspection by the ultrasonic flaw detection system are used in the aircraft engine shaft manufacturing process.

  The flaw detection system includes a rectangular parallelepiped liquid tank, and water is stored in the liquid tank 10. A chuck rotating motor 12 is attached to the inner side of one end wall of the liquid tank 10 so as to be movable up and down, and a chuck is attached to a rotating shaft of the chuck rotating motor 12. The chuck faces the other end wall of the liquid tank 10 and can grip one end of the rod material R to be inspected arranged along the longitudinal direction of the liquid tank 10.

  More specifically, referring also to FIG. 2, the chuck rotating motor 12 is fixed to a rectangular frame-shaped motor frame 16, and the motor frame 16 is fixed to the inner surface of the end wall of the liquid tank 10. The support block 18 and the support frame 20 fixed to the upper part of the end wall of the liquid tank 10 are supported so as to be slidable up and down. A rack 22 that extends vertically is fixed to one side of the motor frame 16, and a pinion 24 is engaged with the rack 22. The pinion 24 is fitted to the rotation shaft of the chuck lifting / lowering motor 26, and when the chuck lifting / lowering motor 26 is operated, the motor frame 16 moves upward or downward via the rack 22 and the pinion 24 depending on the rotation direction. Accordingly, the chuck 14 moves upward or downward.

  Referring again to FIG. 1, two stand rails 28 are fixed inside one side wall of the liquid tank 10. The stand rails 28 are spaced apart from each other in the vertical direction and extend in the horizontal direction. These stand rails 28 are attached with four stands 30 arranged in a horizontal direction, and each stand 30 is movable along the stand rail 28 in the horizontal direction. Specifically, the stand 30 has a back plate 32, and an engaging member attached to the back surface of the back plate 32 is slidably engaged with the stand rail 28.

One end of a stand moving air cylinder 34 is fixed to the back plate 32 of the stand 30 closest to the chuck 14 among the four stands 30. The other end of the stand moving air cylinder 34 is fixed to the upper end of one side wall of the liquid tank 10, and the stand moving air cylinder 34 can be expanded and contracted in the longitudinal direction of the liquid tank 10.
As shown in FIG. 3, an elevating rail 36 extending in the vertical direction is attached to the lower portion of the front surface of the back plate 32. The elevating rail 36 has an L-shaped roller frame 38 via an engaging member. Is attached to move up and down.

  The lower end of the screw rod 42 of the lifting jack 40 is connected to the upper end of the vertical portion of the roller frame 38 via a connecting member 39, and the screw rod 42 passes through the casing of the lifting jack 40. The casing of the lifting / lowering jack 40 is connected to the casing of the roller lifting / lowering motor 44, and the roller lifting / lowering motor 44 is fixed to the upper part of the back plate 32. When the roller raising / lowering motor 44 is operated, a driving force for moving the screw rod 42 up and down is given to the raising / lowering jack 40, whereby the roller frame 38 moves up and down.

  Further, the base end portion of the tilt arm 46 is pin-coupled to the upper portion of the vertical portion of the roller frame 38, and the pinch roller 48 is rotatably attached to the tip end of the tilt arm 46. One end of the tilting air cylinder 50 is pin-coupled to the central portion of the tilting arm 46, and the other end of the tilting air cylinder 50 is pin-coupled to the upper portion of the suspension plate 52 fixed to the connecting member 39. When the tilting air cylinder 50 is extended, the tilting arm 46 tilts so as to be parallel to the horizontal portion of the roller frame 38, while when the tilting air cylinder 50 is expanded or contracted, Tilt so as to be parallel to the vertical portion of the roller frame 38.

A horizontal portion of the roller frame 38 extends in the width direction of the liquid tank 10, and a positioning block 54 is fixed to the lower surface thereof. The positioning block 54 includes a block portion 56 fixed to the lower surface of the roller frame 38, and a shaft portion 58 projects downward from the lower surface of the block portion 56. A head 60 having a diameter larger than that of the shaft portion 58 is integrally formed at the lower end of the shaft portion 58.
On the other hand, a positioning rail 62 is fixed to the inner surface of the bottom wall of the liquid tank 10 corresponding to the position in the width direction of the positioning block 54. The positioning rail 62 extends in the longitudinal direction of the liquid tank 10, and a positioning box 64 is fixed to the positioning rail 62 corresponding to the longitudinal position of each positioning block 54. The positioning box 64 has a hollow box shape, and a slit is formed in the upper wall of the positioning box 64. The slit is parallel to the positioning rail 62, and the shaft portion 58 of the positioning block 54 is inserted through the slit. The head 60 of the positioning block 54 is arranged with play in the vertical direction in the positioning box 64. The upward movement of the roller frame 38 by the lifting jack 40 causes the head 60 of the positioning block 54 to move to the upper wall of the positioning box 64. It is regulated to a certain amount by contacting with. On the other hand, the downward movement of the roller frame 38 is restricted to a certain amount by the block portion 56 of the positioning block 54 coming into contact with the upper wall of the positioning box 64.

  Two sets of two bearing members 66 are fixed to the upper surface of the horizontal portion of each roller frame 38, and the two sets of bearing members 66 are arranged in the width direction of the liquid tank 10. The two bearing members 66 of each set are spaced apart from each other in the longitudinal direction of the liquid tank 10 and rotatably support both ends of one rotating shaft. A receiving roller 68 is fixed to the central portion of the rotating shaft extending between the two bearing members 66, and the two receiving rollers 68 are arranged in the width direction of the liquid tank 10 on the upper surface of each roller frame 38. Are arranged to be rotatable. The two receiving rollers 68 of each stand 30 support the rod material R at a predetermined longitudinal position.

A recess for receiving the lower portion of the receiving roller 68 is formed on the upper surface of the horizontal portion of the roller frame 38.
A movable stage 70 is bridged on both side walls of the liquid tank 10, and the movable stage 70 is movable in the longitudinal direction of the liquid tank 10.
More specifically, the moving stage 70 has leg portions 72 positioned above both side walls of the liquid tank 10, and the upper ends of the leg portions 72 are connected to each other by a horizontal portion 74. A wheel is attached to the lower end of the leg portion 72 via a support plate, and the wheel rotates on the traveling rail 76 fixed to the upper end of the side wall.

  A stage moving motor 78 is fixed on a support plate attached to one leg 72, and the rotating shaft of the stage moving motor 78 extends downward through the support plate. A pinion 80 is fitted to the rotating shaft of the stage moving motor 78, and the pinion 80 is engaged with the rack 82. The rack 82 is fixed to the upper end of the side wall of the liquid tank 10 and extends in parallel with the traveling rail 76. By operating the stage moving motor 78, the moving stage 70 is moved in the longitudinal direction of the liquid tank 10 via the pinion 80 and the rack 82.

A slide member 84 is attached to one side edge of the horizontal portion 74 of the moving stage 70, and the slide member 84 is movable in the longitudinal direction of the horizontal portion 74, that is, in the width direction of the liquid tank 10.
More specifically, a slide member moving motor 86 is fixed on the horizontal portion 74 of the moving stage 70, and the rotation shaft of the slide member moving motor 86 is connected to one end of the screw rod 88. The screw rod 88 extends in parallel with the horizontal portion 74 of the moving stage 70, and a sleeve 90 having a thread groove formed on the inner peripheral surface is fitted. The sleeve 90 is connected to the slide member 84. When the stage moving motor 78 is operated, the screw rod 88 rotates and the sleeve 90 moves in the longitudinal direction of the screw rod 88, and the slide member 84 also moves accordingly. To do.

A casing 91 of a probe lifting / lowering device incorporating a probe lifting / lowering motor is fixed to the slide member 84, and a hollow screw rod 92 extending in the vertical direction passes through the casing 91 so as to be movable up and down. A probe 94 is fixed to the lower end of the screw rod 92 so as to be relatively rotatable, and the probe 94 moves upward or downward by operating a probe lifting / lowering motor.
Further, a probe rotating motor 96 is fixed to the upper end of the screw rod 92 of the probe lifting device, and a probe rotating rod is connected to the rotation shaft of the probe rotating motor 96. . The probe rotating rod penetrates the inside of the screw rod 92 in the vertical direction, and the lower end of the probe rotating rod is connected to the probe 94. Therefore, by operating the probe rotating motor 96, the probe 94 rotates about the axis of the probe rotating rod.

The probe 94 has an ultrasonic transducer, and the ultrasonic transducer can emit ultrasonic waves downward and can receive ultrasonic waves from below.
As shown in FIG. 4, an ultrasonic flaw detector 98 is connected to the probe 94, and the ultrasonic flaw detector 98 has a pulse transmission section, an echo amplification section, a timer, a sweep signal generation section, and a display section. .
When a pulse signal is input to the probe 94 from the pulse transmission unit of the ultrasonic flaw detector 98, the probe 94 transmits pulsed ultrasonic waves. The probe 94 receives the reflected component (echo) of the ultrasonic wave transmitted by itself, the received signal is amplified by the echo amplifying unit, and the intensity of the amplified received signal is indicated on the vertical axis of the display unit. On the other hand, the horizontal axis of the display unit indicates the intensity of the sweep signal that increases in proportion to time, in other words, the propagation distance of the ultrasonic wave. Therefore, if the display part is seen, presence of the reflective component reflected by the defect and its depth from the surface of the rod material R can be known.

The pulse signal and the sweep signal are synchronized by a timer connected to the pulse transmission unit and the sweep signal unit.
The signal input to the display unit is also input to the external recorder 100. Further, a signal input to the display unit may be input to the personal computer 102 as an external control device.
When the operator instructs the execution of the inspection, the personal computer 102 instructs the timer of the ultrasonic flaw detector 98 so that the probe 94 transmits an ultrasonic wave at a predetermined operation timing and receives the reflection component. On the other hand, the personal computer 102 moves the probe 94 at a predetermined movement timing corresponding to the operation timing of the probe 94 through the control panel 104 and the driver 106, and rotates the rod material R at a predetermined rotation timing. .

Hereinafter, an ultrasonic flaw detection method for the rod material R using the ultrasonic flaw detection system described above will be described.
First, prior to the inspection, water is poured into the liquid tank 10 until it is almost full, and then the stand 30 is moved to an appropriate support position according to the length of the rod material R to be inspected.
The rod material R to be inspected is submerged in the liquid tank 10 with its longitudinal direction aligned with the longitudinal direction of the liquid tank 10, and supported by the receiving roller 68 of the stand 30 at the support position.

  The rod material R is sunk at a position away from the chuck 14 so that the end of the rod material R does not collide with the chuck 14 when submerged in the water tank. Therefore, as shown in FIG. 5, when the rod material R is supported by the stand 30, in order to grip the end of the rod material R with the chuck 14, the stand moving air cylinder 34 is contracted from the extended state. It is done. As a result, the stand 30 closest to the chuck 14 moves to the chuck 14 side, and the end of the rod material R is drawn to the chuck 14. Thereafter, the claw of the chuck 14 is closed, and the end of the rod material R is gripped by the chuck 14.

  Before the end portion of the rod material R is attracted to the chuck 14, the chuck raising / lowering motor 26 is operated so that the vertical position of the chuck 14 is matched with the vertical position of the rod material R. At the time of this alignment, the vertical position of each stand 30 is at the highest position where the head 60 of the positioning block 54 comes into contact with the upper wall of the positioning box 64. In the alignment, the vertical position of the receiving roller 68 at the highest position, the diameters and intervals of the two receiving rollers 68 in each stand 30, and the outer diameter of the rod material R are considered.

After the chuck 14 grips the end of the rod member R, the tilting air cylinder 50 is extended from the contracted state, and the pinch roller 48 at the tip of the tilting arm 46 contacts the outer peripheral surface of the rod member R from above. Thereby, the rod material R is pressed against the receiving roller 68 with a predetermined pressure.
Thus, the arrangement of the rod material R is finished and the measurement is started. The measurement is started, for example, at the end of the rod material R on the chuck 14 side. For this reason, the probe 94 is moved immediately above the end of the rod material R and then descends to the vicinity of the outer peripheral surface of the rod material R. Be made.

The probe 94 is movable in the longitudinal direction (X-axis direction) of the liquid tank 10, the width direction of the liquid tank 10 (Y-axis direction), and the depth direction of the liquid tank 10 (Z-axis direction). Further, it can be rotated around the Z axis at a predetermined rotation angle θ.
In one measurement, the probe 94 transmits ultrasonic waves to the outer peripheral surface of the rod material R, and the reflection component is detected by the probe 94. Since this one-time measurement region is finite in the circumferential direction and the axial direction of the rod material R, the measurement is performed a plurality of times in order to inspect the entire rod material R.

That is, while the rod material R rotates about its own axis, the measurement is performed a plurality of times at a predetermined interval, and the probe 94 is moved in the X-axis direction every time the rod material R rotates once. Measurement is performed with a certain amount of shift. Thus, the measurement is performed from the end of the rod material R on the chuck 14 side to the opposite end, and one inspection is completed.
During the inspection, the rotation of the rod material R is realized by rotating the chuck 14, and the rod material R rotates while being supported by the receiving rollers 68 of the four stands 30, for example, depending on its length.

  Here, in the measurement (offset measurement) in which the position of the probe 94 is separated from the center position of the rod material R by a predetermined length when viewed in the width direction of the liquid tank 10, the outer diameter of the rod material R is set. Depending on this, ultrasonic waves may be reflected by the receiving roller 68, and noise may be superimposed on the reflected component. In order to prevent the occurrence of such noise, as schematically shown in FIG. 6, for the stand 30 where measurement is performed in the vicinity of itself, the roller raising / lowering motor 44 is driven in advance, and the receiving roller 68 is moved. It is preferable that the rod material R is supported by the remaining three stands 30 while being retracted downward. Then, after the measurement in the vicinity of itself is completed, the stand 30 that has been saved is moved to the highest position, and the rod material R is supported by the receiving roller 68 again.

Further, during this inspection, the rod material R is pressed against the receiving roller 68 from above by the four pinch rollers 48, for example, depending on the length thereof.
However, when the pinch roller 48 is in contact with the rod material R, the probe 94 moving in the axial direction of the rod material R collides with the pinch roller 48 and the tilting arm 46. Therefore, for the stand 30 to be measured in the vicinity of itself, the tilting air cylinder 50 is driven to contract in advance, and its pinch roller 48 and tilting arm 46 are retracted obliquely upward, and the remaining three stand 30 pinch rollers. The rod material R is pressed by 48. After the measurement in the vicinity of the probe is finished and the probe 94 is separated, the tilting air cylinder 50 is extended and brought into contact with the rod material R of the pinch roller 48 that has been retracted.

  In the above-described ultrasonic inspection method for the rod material R, the rotation of the chuck 14 and the rotation of the rod material R are completely synchronized because the rod material R is rotated by rotating the chuck 14. Therefore, the rotation of the rod material R and the operation timing of the probe 94 do not deviate from the setting. As a result, according to this flaw detection method, the position of the detected defect in the rod material R can be accurately grasped.

Further, in the ultrasonic flaw detection method for the rod material R described above, by separating the stand 30 in the vicinity of the probe 94 from the rod material R, the ultrasonic wave is prevented from being reflected by the receiving roller 68 of the stand 30; Noise is not superimposed on the reflection component. As a result, according to this flaw detection method, the presence of a defect in the rod material R is reliably detected.
Further, in the above-described ultrasonic inspection method for the rod material R, the pinch roller 48 prevents the shaft material of the rod material R from being shaken, so that the position of the defect can be grasped more accurately. On the other hand, since the pinch roller 48 near the probe 94 is separated from the rod material R, the movement of the probe 94 is not hindered by the pinch roller 48.

  The present invention is not limited to the above-described embodiment, and various modifications are possible. For example, the rod material R to be inspected may be solid or hollow. When the rod material R is hollow, the claw of the chuck 14 is preferably in contact with the inner peripheral surface from the inside in the radial direction of the rod material R as shown in FIG. This is because the end of the rod material R on the chuck 14 side can be measured.

In the above-described embodiment, the rod material R is supported by the four stands 30, but the number of the stands 30 is not particularly limited. However, in order to prevent the rod material R from being bent or tilted, it is preferable that the rod material R is always supported by two or more stands 30 that are axially spaced from each other.
In the above-described embodiment, the rod material R is pressed by the four pinch rollers 48, but the pinch roller 48 may not be provided.

In the above-described embodiment, the probe 94 is intermittently moved in the longitudinal direction of the rod material R every time the rod material R rotates once. However, as the rod material R rotates, the probe 94 is moved to the rod. The material R may be continuously moved in the longitudinal direction. That is, from a relative viewpoint, the probe 94 may be moved spirally around the rod material R, and the measurement may be repeated during this time.
In the above-described embodiment, one probe 94 transmits an ultrasonic wave and receives a reflection component. However, two probes are provided, one probe transmits an ultrasonic wave, and the other. The reflection component may be received by the probe. Further, the probe may be inclined with respect to the vertical direction, and ultrasonic waves may be incident on the rod material R obliquely.

1 is a cross-sectional view schematically illustrating a configuration of an ultrasonic flaw detection system for a rod material according to an embodiment. FIG. 2 is another cross-sectional view schematically showing the configuration of the system of FIG. 1. FIG. 4 is still another cross-sectional view schematically showing the configuration of the system of FIG. 1. FIG. 2 is a block diagram schematically showing a configuration of a control system of the system of FIG. 1. It is a figure for demonstrating the function of the air cylinder for stand movements of the system of FIG. 1, and the upper side shows the state which this air cylinder expanded, and the lower side shows the state which the air cylinder contracted. It is a figure for demonstrating escape of a receiving roller and a pinch roller in the case of the test | inspection using the system of FIG. It is a figure which shows schematically the chuck | zipper of a modification.

Explanation of symbols

10 liquid tank
14 Chuck
30 stands
94 transducer

Claims (4)

A step of supporting the rod material rotatably around the axis of the rod material on the support device arranged in the liquid tank;
One end of the rod material supported by the support device is gripped by a chuck, and an ultrasonic wave is transmitted toward the rod material and a reflection component of the ultrasonic wave is received near the outer peripheral surface of the rod material. Placing an operable probe on the
The rod material is rotated by rotating the chuck, and the probe is moved in the axial direction of the rod material at a predetermined movement timing in accordance with the rotation of the chuck. A rod comprising: a step of operating the probe at a predetermined operation timing; and a step of detecting a defect in the rod material based on the reflection component received at each operation of the probe. Ultrasonic flaw detection method for materials. The support device has three or more stands arranged along the axis of the rod member,
Prior to operating the probe in the vicinity of any one of the stands as viewed in the axial direction of the rod material, the one stand is separated from the rod material, and the remaining stands are used to The rod material ultrasonic flaw detection method according to claim 1, wherein the rod material is supported. The support means further includes a plurality of pinch rollers arranged along the axis of the rod material,
Prior to operating the probe in the vicinity of any one of the pinch rollers as viewed in the axial direction of the rod material, the one pinch roller is separated from the rod material, and the remaining The method for ultrasonic inspection of a rod material according to claim 1 or 2, wherein an axial deviation of the rod material is regulated by a pinch roller. A support device that is disposed in the liquid tank and supports the rod material rotatably about the axis of the rod material;
A chuck for gripping one end of the rod material supported by the support device;
A probe disposed near an outer peripheral surface of the rod material and operable to transmit an ultrasonic wave toward the rod material and receive a reflected component of the ultrasonic wave;
A rotating device for rotating the rod material by rotating the chuck;
A moving device for moving the probe in the axial direction of the rod member at a predetermined timing with respect to the rotation of the chuck;
A detector for operating the probe at a plurality of operating positions relative to the rod material, and detecting a defect of the rod material based on the reflection component at each operating position. Characteristic ultrasonic inspection system for rod materials.

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