JPH0329744Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a structure for fixing a standard test piece used in magnetic particle testing (magnetic particle inspection) to a test surface.

In magnetic particle testing, defects such as cracks (discontinuities) in a test piece change the magnetic field, and this phenomenon is exhibited by fine magnetic particles. This is a non-destructive testing method to determine the presence and extent of the presence. When conducting this test, it is necessary to fix the standard test piece on the test surface before starting work. This standard test piece is electromagnetic soft iron with specified materials, dimensions, and artificial flaws certified by an authoritative institution, and by using this standard test piece, the performance of equipment, magnetic particles, and test liquid can be improved. The strength and direction of the effective magnetic field on the test surface, the effective flaw detection range, and the suitability of the test operation must be investigated.

By the way, in the past, a standard test piece was attached to the test surface using an appropriate adhesive tape so that it would come into close contact with the test surface. Therefore, especially when testing various test products (samples), extremely complicated work has been required. Furthermore, when using adhesive tape, it is sometimes difficult to apply the tape, especially in places where the work environment is not favorable, such as a dark place or a narrow place. In addition, when standard test pieces are repeatedly bent and stretched, the bottom of the grooves of the artificial scratches may crack and their magnetic performance may change, so care must be taken when handling them. When peeling off the standard test piece, there was a large risk that the standard test piece would be bent, causing a large change in the magnetic performance of the standard test piece.

The purpose of this invention is to allow standard test pieces to be easily and quickly fixed to test surfaces at various locations with simple operations without using adhesive tape, and to allow standard test pieces to be easily and quickly fixed to test surfaces at various locations without using adhesive tape. The purpose of the present invention is to provide a standard test piece fixing structure for magnetic particle flaw detection without any fear.

Therefore, in the present invention, the arm is attached to the magnet for magnetizing the test specimen that is attracted to the test surface so that its position can be adjusted, the tip side of this arm is facing the test surface, and the standard test piece is attached to the test surface through an elastic member. In order to achieve the above object, the device is configured to be pressed and fixed in close contact with each other.

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIGS. 1 and 2 show an embodiment of a standard test piece fixing structure for magnetic particle flaw detection according to the present invention. In the figure,
A permanent magnet 12 serving as a magnet for magnetizing the test product is attracted onto the test surface 11A of the test product 11. The permanent magnet 12 is formed into a cylindrical shape, etc., and a bolt shaft 13 is fixed to the central shaft portion thereof with a predetermined length protruding from the upper end surface. For example, two tightening nuts 14 are fixed at a predetermined height position of the bolt shaft 13, and an arm body 16 and a biasing plate 17 are inserted through the bolt shaft 13 and placed on these tightening nuts 14 via washers 15. Further, a wing nut 19 is screwed to the upper part of the arm body 16 and the biasing plate 17 via a washer 18.
In other words, the tightening nut 14 and the wing nut 19
An arm body 16 and a biasing plate 17 are mounted in between so as to be height adjustable. In other words, arm body 1
6 is attached to the permanent magnet 12 via a bolt shaft 13.

Both the arm body 16 and the biasing plate 17 are formed of transparent acrylic plates or the like. Furthermore, an intervening rod 21 made of an acrylic rod or the like is attached to the distal end side of the arm body 16. This interposition rod 21 is pushed into the space between the arm body 16 and the biasing plate 17, and therefore, the interposition rod 21 forces the arm body 1
The tip side of 6 is the lower side in Figure 2 (test surface 11A side)
is energized by

The arm body 16 has a crank-shaped cross section (see FIG. 2) by bending a single acrylic plate or by joining a plurality of acrylic plates to each other. The arm body 16, which has a crank-shaped cross section, has a proximal end fixed to the bolt shaft 13, and a distal end serving as a holding frame portion 22 disposed near the test surface 11A and substantially parallel to the test surface 11A. This presser frame portion 22 is
It has approximately the same size on the inside as the standard test piece 23, and is formed into a rectangular frame plate shape with, for example, a rectangular viewing window 24 bored in the center.

Small insertion holes 2 are provided at each of the four corners of the presser frame portion 22.
5 (see Figure 2) are drilled, and these insertion holes 25
A pin-shaped presser shaft 26 having a retainer 26A at its base end is inserted through the shaft so as to be movable forward and backward. A presser pad 27 having a predetermined thickness is fixed to the tip of the presser shaft 26 (lower end in the figure). These presser foot parts 2
7 is made of a synthetic resin plate such as an acrylic plate, and is designed to prevent damage to the standard test piece 23. In addition, the presser foot pad 27 and the presser frame portion 2
A compression coil spring 28, which is an elastic member, is interposed between the lower end surface of the compression coil spring 28 and the lower end surface of the compression coil spring 28.
Accordingly, each presser pad 27 presses the standard test piece 23 onto the test surface 11A to tightly fix it.

Next, the fixing operation of the standard test piece 23 in this example will be explained.

The height positions of the two tightening nuts 14 are determined appropriately in advance, and the wing nut 19 is left in a slightly loosened state. In this state, the permanent magnet 12 is attracted to the test piece 11, and at the same time, presser pads 27 are applied to the four corners of the standard test piece 23 to temporarily fix the test piece 23 on the test surface 11A. Even in this temporarily fixed state, the standard test piece 23 is temporarily fixed on the test surface 11A, but it is possible to accurately position the standard test piece 23 on the test surface 11A.

After determining the position of the standard test piece 23 on the test surface 11A, the wing nut 19 is tightened. As a result, the biasing plate 17, particularly the intervening rod 21 provided on the biasing plate 17, acts to press the distal end side of the arm body 16, that is, the presser frame portion 22 side, toward the test surface 11A side. Therefore, the elastic force of the arm body 16 itself and the elastic force of the biasing plate 17 applied to the arm body 16 via the interposition rod 21 to further strengthen this elastic force.
Furthermore, the standard test piece 23 is pressed onto the test surface 11A by the combined force of all the spring forces of the compression coil springs 28 that press the holding pads 27 provided at the four corners of the holding frame 22 toward the test piece 23. As a result, the standard test piece 23 is tightly fixed on the test surface 11A.

This embodiment has the following effects.

The standard test piece 23 can be fixed on the test surface 11A without using an adhesive tape as in the past. Therefore, unlike the case of fixing using adhesive tape, it is possible to fix the standard test piece 23 in places where it would be impossible to fix it conventionally, such as in places with moisture, dark places, narrow places, etc. This has the effect that the standard test piece 23 can be easily fixed even in extremely difficult locations.

Further, the operation required to fix the standard test piece 23 is only a slight operation of the wing nut 19, or in some cases, the wing nut 19 may be tightened in advance. It is also possible to fix the standard test piece 23 with the test surface 11A facing upward without any operation. Therefore, standard test piece 23
The fixing operation itself is extremely simple. Therefore, the labor required for test operations can be significantly reduced, and even when multiple locations must be tested one after another, the test can be completed in a relatively short time.

Furthermore, when using adhesive tape, the standard test piece 2 should be used especially when peeling off the adhesive tape.
However, according to this example, the standard test piece 23 was placed on the test surface. Of course, when fixing on 11A,
Even when the standard test piece 23 is removed from the test surface 11A, there is no fear of bending the standard test piece 23 or changing the magnetic performance of the standard test piece 23. Therefore, the test accuracy itself can be improved, and
It is also possible to extend the life of the standard test piece 23.

Further, there is an effect that the test liquid can be applied from any position except for the part held down by the holding pad 27.

Furthermore, since the arm body 16 can be adjusted in height, that is, in the pressing direction, the standard test piece 23 can be placed on the test surface 11.
In addition to being able to adjust the force applied to the arm body 1 as appropriate, even if there is a step on the test surface 11A and the mounting heights of the permanent magnet 12 and the standard test piece 23 are different,
This can be easily done by adjusting the position of 6.

Furthermore, between the standard test piece 23 and the holding frame portion 22 of the arm body 16, there is a compression coil spring 2 which is an elastic member.
8 is interposed, it is possible to disperse the pressing force of the test piece 23 and equalize the surface pressure, thereby ensuring reliable and stable close fixation. Even if an excessive pressing force is applied to the side, it can be buffered by the coil spring 28, so the test piece 23 will not be bent or damaged.

In addition, in implementation, although the biasing plate 17 is not necessarily required, the biasing plate 17 is provided, and especially the interposed rod 21
By providing the biasing plate 17 having
6 can be configured to be particularly strongly pressed against the test surface 11A side. Also, arm body 16
The biasing plate 17 is not necessarily made of a transparent acrylic plate or the like, but if it is a transparent acrylic plate or the like, it is lightweight and there is no risk of damaging the parts, and furthermore, since it is transparent, it is easy to observe. This has the effect of making it difficult to create blind spots. In addition, a synthetic resin material has the advantage of being resistant to corrosion.

In addition, each presser part 27 that directly presses the standard test piece 23 was also made of a transparent acrylic plate.
The material constituting the presser pad 27 is not limited to these materials. However, if it is a transparent acrylic plate, it is easy to determine the holding position of the standard test piece 23, and there is no fear that the holding part 27 will damage the surface of the standard test piece 23.

Furthermore, in the embodiment, the elastic force of the arm body 16 and the biasing plate 17 and the compression coil spring 2
Standard specimen 23 by the resultant force of all the spring forces of 8
However, the resultant force of all these forces is not necessarily necessary; for example, the standard test piece 23 is pressed and fixed onto the test surface 11A only by the spring force of the compression coil spring 28. The configuration may be such that the pressure is applied to the However, if the configuration is as in the embodiment described above, although the overall configuration is simple, there is an effect that the standard test piece 23 can be pressed and fixed tightly onto the test surface 11A with an extremely large force. .

Furthermore, although the viewing window 24 does not necessarily have to be provided, if the viewing window 24 is provided, the central part of the standard test piece 23 can be easily directly observed through the viewing window 24, The field of view is not obstructed when checking defects, which is extremely convenient.

Further, the presser pads 27 are provided at the four corners of the presser frame portion 22, and therefore, the presser pads 27 are configured to be applied to each of the four corners of the standard test piece 23, but this configuration is not necessarily limited. It's not something you can do. However, if the holding pads 27 are provided at the four corners, there is an effect that the test liquid can be applied from the four sides of the standard test piece 23.

In addition, although the magnet for magnetizing the test item is the permanent magnet 12, it is not limited to the permanent magnet 12, but may be an electromagnet, or may be used in a magnetic stand, etc., and the magnet can be rotated by switching a lever. , a permanent magnet structure that can be switched between an attracted state and a non-adsorbed state may be used. Furthermore, the attachment structure between the arm body 16 and the bolt shaft 13 is not limited to the above-mentioned case, and furthermore, the structure in which the biasing plate 17 is not necessarily attached via the bolt shaft 13 may be used. Furthermore, the standard test piece 23 may be of any standard such as A type, B type, C type, etc.

As described above, according to the present invention, standard test pieces can be easily and quickly fixed to test surfaces at various locations with simple operations without using adhesive tape, and the test pieces can be easily and quickly fixed to test surfaces at various locations without using adhesive tape. It is possible to provide a standard test piece fixing structure for magnetic particle flaw detection without the fear of

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of a standard test piece fixing structure for magnetic particle flaw detection according to the present invention, and FIG. 2 is a sectional view taken along the line - in FIG. 1. 11...Test product, 11A...Test surface, 12...
Permanent magnet as test item magnetization magnet, 13... Bolt shaft, 16... Arm body, 17... Biasing plate, 22...
... Presser frame portion, 23 ... Standard test piece, 24 ... Peephole, 27 ... Presser pat, 28 ... Compression coil spring.

Claims (1)

[Scope of utility model registration request] This is a fixing structure that tightly fixes a standard test piece for magnetic particle testing on a test surface, and has an arm whose position can be adjusted to a magnet for magnetizing the test product that is attracted to the test surface. 1. A standard test piece fixing structure for magnetic particle flaw detection, characterized in that the standard test piece is pressed against the test surface via an elastic member to tightly fix the standard test piece, with the side facing the test surface.