JPH0545971Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an ultrasonic flaw detection device, and particularly to a positioning structure when performing ultrasonic flaw detection on a cylindrical workpiece.

(Prior art) For example, as a device for inspecting defects such as internal cavities and cracks in cast parts, etc.
An ultrasonic flaw detection device as disclosed in Japanese Patent No. 135955 is known. This is a device that transmits ultrasonic pulses to an object to be inspected using a flaw detector, receives reflected waves from the object, and detects the presence or absence of internal defects based on changes in the wavelength of the reflected waves.

(Problems to be Solved by the Invention) When inspecting a cylindrical cirque using the above ultrasonic flaw detection device, the flaw detector is placed close to both end faces of the cylindrical workpiece by a predetermined distance. thus,
Next, the cylindrical workpiece is inspected while being rotated around its axis, but at this time, the cylindrical workpiece shakes in the axial direction due to rotational vibration. This causes a problem in that the distance between the flaw detector and the inspection part of the cylindrical workpiece changes, causing variations in the wavelength of the reflected waves and causing measurement errors.

The present invention has been made in view of the above problems. The purpose is to provide an ultrasonic flaw detection device having a positioning structure that prevents the cylindrical workpiece from wobbling when performing ultrasonic flaw detection while rotating the cylindrical workpiece around its axis.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides at least one ultrasonic pulse that is arranged on the end face side of a cylindrical workpiece at a predetermined distance from the end face, and that transmits ultrasonic pulses. and a flaw detector that receives reflected waves obtained from the cylindrical workpiece, and a rotary shaft that is arranged parallel to the axis of the cylindrical workpiece and that is in contact with the side surface of the cylindrical workpiece. a first rotor that rotatably supports the workpiece around its axis;
a second rotor whose rotating shaft is inclined at a predetermined angle in a horizontal plane with respect to the axial center of the cylindrical workpiece, and abuts against a side surface of the cylindrical workpiece to move the cylindrical workpiece in the direction of its axial center; a driving means for rotationally driving at least one of the first and second rotors to rotate the cylindrical workpiece around its axis; and a driving means provided in the moving direction of the cylindrical workpiece, and an end face of the cylindrical workpiece. and a movement regulating member that comes into contact with and prevents movement of the cylindrical workpiece in the axial direction.

(Function) Since the present invention has the above configuration, the cylindrical workpiece is rotated by the driving means that rotationally drives at least one of the first and second rotors. Then, the rotation of the second rotor applies a propulsive force to the cylindrical workpiece to move it in the axial direction. This is because the rotation axis of the second rotor is arranged inclined at a predetermined angle in a horizontal plane with respect to the axis of the cylindrical workpiece, and
As the rotor rotates in contact with the side surface of the cylindrical workpiece, a force is applied from the second rotor to the side surface of the cylindrical workpiece in a direction inclined at the predetermined angle with respect to a line perpendicular to the axis of the cylindrical workpiece in a horizontal plane. acts. This force acts on the side surface of the cylindrical workpiece as a component force in the axial direction of the cylindrical workpiece and in a direction perpendicular to the axial center of the cylindrical workpiece. This becomes a driving force that moves the workpiece in the axial direction, and a force component in a direction perpendicular to the axis of the cylindrical workpiece becomes a force that rotates the cylindrical workpiece around its axis. However, movement of the cylindrical workpiece in the axial direction is suppressed by the movement regulating member.

(Effect of the invention) In the present invention, the rotating shaft is arranged at a predetermined angle in the horizontal plane with respect to the axis of the cylindrical workpiece, and contacts the side surface of the cylindrical workpiece to move the cylindrical workpiece in the direction of its axis. A second rotor is provided to move the cylindrical workpiece, and a movement restriction member is provided in the moving direction of the cylindrical workpiece and comes into contact with an end face of the cylindrical workpiece to prevent movement of the cylindrical workpiece in the axial direction. . Therefore, since the cylindrical workpiece rotates while contacting the movement regulating member, the axial deflection of the cylindrical workpiece can be reduced. Therefore, even when performing ultrasonic flaw detection while rotating a cylindrical work around its axis, the distance between the flaw detector and the inspection part of the cylindrical work can be maintained almost constant, and as a result, measurement errors can be reduced. can be reduced.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In Figures 1 and 2, an ultrasonic flaw detection device A is submerged in a water tank 1 filled with anti-rust liquid, and a base 3 is placed at the bottom of the tank.
is permanently installed. A pair of left and right guide bars 5, 5 are provided on the base 3 from approximately the center to one end. A movable base 7 is movably provided on the guide bars 5, 5. This movable base 7 has a built-in screw clamp, and the rotation of the clamp arm 9 allows the movable base 7 to be attached to the guide bars 5 and 5.
It can be attached and detached and moved to accommodate changes in the length of the cylindrical workpiece W. Also,
The movable base 7 is provided with a first roller mounting base 11, and the first roller mounting base 11 has first rollers 13, 13 having axes parallel to the guide bar 5.
is pivotably mounted. The first roller mounting base 11 is provided with a flaw detector support member 15 facing upward to which the flaw detector 17 is attached.

At the other end of the base 3, second rollers 25, 2
A fixed base 19 having a second roller mounting base 21 to which the roller 5 is rotatably mounted is fixedly provided. With the cylindrical workpiece W placed on the first rollers 13, 13 and the second rollers 25, 25, the second rollers 25, 2
5 is provided so that its rotation axis is inclined by about 5 degrees in the horizontal plane with respect to the axis of the cylindrical workpiece W. A stopper 35 serving as a movement regulating member is rotatably mounted on the second roller mounting base 21 . Further, pulleys 23, 23 are provided on the same axis of the second rollers 25, 25, and pulleys 23, 2
A pulley belt 31 is wound around 3 and connected to pulleys 27 and 29. The pulley 27 has the same rotation axis as the bevel gear 33. A bevel gear 43 that is rotated by a motor 41 serving as a driving means meshes with the bevel gear 33 .
Further, the second roller mounting base 21 is provided with a flaw detector supporting member 37 facing upward, to which a flaw detector 39, which is disposed at the same height as the flaw detector 17, is attached. Further, the motor 41 is attached to the upper part of the flaw detector supporting member 37. In FIGS. 2 and 3, arm support members 45, 45 are vertically provided on the outer peripheral surface of the water tank 1 in the longitudinal direction. A rod 48 is rotatably provided at the upper end portions of the arm support members 45, 45, and a first arm 47 is pivotally connected to the rod 48. The first arm 47 is fixed in position, and has a work receiving member 49 attached to one end thereof, on which one end of the work W is placed. A rod 52 of a cylinder 51 is rotatably attached to the rear end of the first arm 47.
By the extension of the rod 52, the workpiece receiving member 49 is moved between the first rollers 13, 13 and the second rollers 25, 25.
It is operated so that it can be lowered between. On the other hand, the second arm 53 is connected to the rod 48 via the screw clamp 55.
It is mounted so that it cannot rotate. here,
By rotating the clamp arm 57 of the screw clamp 55, the second arm 53 is movable on the rod 48, so that it can respond to changes in the length of the cylindrical workpiece W. Furthermore, the same workpiece receiving member 49 of the first arm 47 is attached to the tip of the second arm 53.

Since the ultrasonic flaw detection apparatus of this embodiment has the above configuration, the operation when inspecting a cylindrical workpiece W is as follows. First, the first and second arms 47 and 53 are swung downward by the extension of the cylinder 51, and the workpiece W placed on the workpiece receiving member 49 is transferred onto the first and second rollers 13 and 25. After that, the motor 41 is driven to move the second roller 25 to the third roller.
When rotated counterclockwise in the figure, the rotational force of the second roller 25 is applied to the cylindrical workpiece W at the contact portion between the second roller 25 and the workpiece W, and is perpendicular to the axis of the cylindrical workpiece W in the horizontal plane. A force acts in a direction tilted 5 degrees to the line. This force acts on the side surface of the cylindrical workpiece W as component forces in the axial direction of the cylindrical workpiece W and in a direction perpendicular to the axial center of the cylindrical workpiece W. The force becomes a driving force to move the cylindrical workpiece W in the axial direction, and the component force in the direction perpendicular to the axial center of the cylindrical workpiece W becomes a force to rotate the cylindrical workpiece W around its axis. Therefore, a driving force acts on the cylindrical work W to move it toward the second rollers 25, 25 in the axial direction.
However, a stopper 35 is provided in the direction of the propulsion force of the cylindrical workpiece W to prevent movement of the cylindrical workpiece W. Therefore, the cylindrical workpiece W is prevented from moving while the stopper 35 is pressed. Therefore, the axial runout in the radial direction of the cylindrical workpiece W is reduced.

In the above embodiment, the roller support points of the cylindrical workpiece W are at both ends, and the drive-side roller is tilted at a predetermined angle. However, there may be multiple support points, and the tilted rollers have the same angle and direction The rollers may be located at any location.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an ultrasonic flaw detection apparatus showing an embodiment of the present invention, FIG. 2 is a front view of FIG. 1, and FIG. 3 is a view taken along the - arrow in FIG. 17, 39...Flaw detector, 13...First roller (roller), 25...Second roller (roller), 41
...Motor (driving means), 35...Stopper (movement regulating member).

Claims (1)

[Scope of utility model registration request] At least one flaw detector is disposed on the end face side of the cylindrical workpiece at a predetermined distance from the end face, and from which ultrasonic pulses are transmitted and reflected waves obtained from the cylindrical workpiece are received; arranged parallel to the axis of the cylindrical workpiece,
and a first rotor that abuts a side surface of the cylindrical workpiece to rotatably support the cylindrical workpiece around its axis, and a rotating shaft that is inclined at a predetermined angle in a horizontal plane with respect to the axis of the cylindrical workpiece. a second rotor that is arranged to move the cylindrical workpiece in the axial direction by contacting a side surface of the cylindrical workpiece; a drive means for rotating the workpiece around its axis; and a movement restriction provided in the movement direction of the cylindrical workpiece and abutting against an end face of the cylindrical workpiece to prevent movement of the cylindrical workpiece in the axial direction. An ultrasonic flaw detection device comprising a member.