KR900010665Y1 - Jig of magnetic detecting system - Google Patents

Abstract

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Description

Magnetic particle detector jig

Figure 1 is a perspective view showing the to-be-tested object to be magnetically detected using the present invention.

2 is a plan view of the same.

3 is a schematic diagram showing a state in which a particle is inspected by a conventional magnetic particle detector.

Figure 4 is a perspective view showing the attachment position for detecting the state in which the to-be-detected object of FIG.

5 is an explanatory diagram showing a specimen (JIS A ₁ standard test specimen).

FIG. 6 is an explanatory diagram showing the flaw detection state shown in the specimen at each position when the specimen of FIG. 5 is attached to each position shown in FIG.

FIG. 7 is a plan view of the FIG. 1 specimen showing explanatory that each part of the to-be-observed object shown in FIG. 1 is expected to be uniformly inspected if the circumferential optical rod magnetization magnetic lines are continuous. FIG.

FIG. 8 is an explanatory view illustratively showing that a dotted line portion must be magnetically continuous in order for the magnetic lines of force to be continuous at two adjacent portions of the to-be-observed object shown in FIG.

9 is a perspective view showing the present invention jig so that each part of the to-be-observed object shown in FIG.

FIG. 10 is a plan view showing a state in which the to-be-observed object of FIG. 1 is placed on the jig shown in FIG.

FIG. 11 is a plan view showing a state in which the movable part of the jig is placed in position so that adjacent parts having different heights and magnetic circuits are magnetically continuous after placing the to-be-tested object in the state of FIG.

FIG. 12 is an explanatory diagram showing the state of the flaw shown in the specimen at each position when the specimen of FIG. 1 is attached to the specimen attachment position shown in FIG. 4 by the jig shown in FIG. .

* Explanation of symbols for main parts of the drawings

1: the subject 4, 5, 6, 7, 8 branch

9, 10: annular coil 12: through rod

13: jig 15: substrate

16, 17, 18, 19, 20: replenishment

The present invention relates to a jig for magnetic particle detectors, and in particular, as a part of a vehicle steering system, a single inspection process is performed on a casting or forged knuckle having a plurality of branches having different directions, heights, and inclinations. The present invention relates to a jig for magnetic particle flaw detection, which can also inspect a wound such as a crack in all areas.

Generally, castings or forged products with through holes in the center and formed with multiple branches having different directions, heights, and inclinations are circumferential wounds of the to-be-tested object as one-time simultaneous magnetization of current through magnetization and coil magnetization of through rod And axial wounds are simultaneously examined.

In this case, the magnetic force lines formed by the penetrating rods extend in the circumferential direction so that the X (length, axial) wounds can be detected in all parts of each branch, but the magnetic lines are not continuous between adjacent branches. In E, there was a defect that the X-direction wound was not detected. Therefore, such a to-be-detected object has the trouble of detecting several times by changing the flaw detection position.

In the present invention, in view of the above-described conventional ones, each part is to be inspected by one flaw detection on a complex-shaped to-be-tested object, which will be described in more detail based on the accompanying drawings.

1 shows the to-be-tested object 1 to be examined in the present invention, which is a part of the steering apparatus. According to this, the to-be-tested object 1 has a fuselage 3 having a through hole 2 at its center, and a plurality of branches 4, 5, 6, 7 having different directions, heights and inclinations. 8) For convenience, the branch in the 12-direction is referred to as the first branch 4 in the second direction, and the second branch 5, the third branch 6, the fourth branch 7 and the fifth branch 8 in the clockwise order. It was.

Each of these branches 4, 5, 6, 7, 8 extends radially from the fuselage 3, but differs in shape, height, or inclination thereof.

In general, such a target 1 is magnetically inspected in the manner shown in FIG. That is, the magnetic particle flaw detector shown in FIG. 3 is composed of a lower first annular coil 9 and an upper second annular coil 10, and a through rod lower electrode 11 is positioned at the center of the first annular coil 9. The through rod 12 is connected to it from the top. The to-be-tested object 1 shown in FIGS. 1 and 2 is enclosed by the first and second annular coils 9 and 10 while being placed on the light rod lower electrode 11, and the through rod 12 Is penetrated through the to-be-tested object 1 and can be electrically connected to the penetrating rod lower electrode 11.

The to-be-tested object 1 is placed on the penetrating rod lower electrode 11, and then the to-be-tested object 1 is coated with a magnetic liquid fluorescing by ultraviolet rays before the test.

The magnetic force lines formed by the first annular coil 9 and the second annular coil 10 during the flaw detection are guided in the axial direction so as to flaw the Y (circumferential) direction wounds in the respective portions of the target object 1. On the other hand, current flows through the through rod 12 to induce magnetic lines of force in the circumferential direction, and wounds in the X (axial) direction are detected at each part of the object 1. Fine wounds, such as cracks, can be easily identified with the naked eye under an ultraviolet lamp because magnetic force is leaked by these lines of magnetic force to form N, S magnetic poles and magnetic particles are collected therein.

However, when the to-be-detected object 1 of FIG. 1 is examined in the manner shown in FIG. 3, the magnetic lines of force cannot be continued in the circumferential direction through the respective branches 4, 5, 6, 7, and 8. In the branches (4) (5) (6) (7) (8), it was found that some areas were not detected because the magnetic lines did not pass.

That is, as shown in FIG. 4, the specimen 21 as shown in FIG. 5 was attached to an arbitrarily selected position ao of each of the branches 4 to 8, and the flaw detection was examined. As shown in FIG. The result came out.

Here, the specimen 21 (JIS A ₁ Standard Test Specimen 30/50) was attached and examined, and it was found that magnetic lines in the circumferential direction were not closed in almost all positions. This result is because the circumferential magnetic force lines do not continue through each branch 4-8.

In view of this, the inventor fills the magnetizable refill between the branches 4, 5, 6, 7 and 8, as shown in FIG. 7 and FIG. Expected to be continuous. This refill corresponds to the hatched portion in FIG. 7, and as shown in the side view, the third branch 6 and the fourth branch 7 are different from each other in height and inclination so that they are supplemented in the position shown by the dotted line. Expected to have water.

Designed in this way is the jig 13 shown in FIG. This jig 13 includes a substrate 15 having a through hole 14 in the center so that the to-be-tested object 1 shown in FIG. 1 can be placed thereon, and the substrates 15 have respective branches 4 and 5. (6) (7) (8), that is, between branches (4)-(5), between branches (5)-(6), between branches (6) (7), branches (7)-(8) Between them and the branches 8-4 are magnetized replenishments 16, 17, 18, 19 and 20, in which they conform to a three-dimensional shape.

The state in which the to-be-tested object 1 is placed on this jig 13 is shown in FIG. All or part of the 3rd supplement 18 and the 4th supplement 19 is movable so that insertion of the to-be-tested object 1 may be performed smoothly.

The third supplement 18 is movable in its entirety and the fourth supplement 19 has a separate movable supplement 21. These allow magnetic force lines to be continuous between the third branch 6 and the fourth branch 7 of the to-be-tested object of different heights, and between the fifth branch 8 and the first branch 4, ) And the jig 13 are shown in FIG.

Thus, when the final bond was detected by the magnetic particle flaw detector shown in FIG. 3, the flaw detection state by the specimen at each position shown in FIG. 4 was the same as that of FIG. As shown in FIG. 12, it can be seen that a circumferential magnetic force line has passed through each branch of the specimen.

Therefore, the use of the jig of the present invention has the advantage that it is possible to find out the wounds in the X and Y directions at each site by inspecting a complex object to be examined once.

Claims (1)

The through rod lower electrode 11 positioned in the center of the lower first annular coil 9, the upper second annular coil 10, and the first annular coil 9 and a through rod that can be connected thereto from the top ( In the magnetic particle flaw detector composed of 12), a jig for inspecting the to-be-tested object 1, in which a plurality of branches 4, 5, 6, 7, 8, having different directions, heights, and inclinations, extend. (13), wherein the jig 13 is placed between each branch 4, 5, 6, 7, 8 on the substrate 15 on which the to-be-tested object 1 is placed. A jig for magnetic particle flaw detection, characterized in that it is constructed by mounting a magnetizable replenishment (16) (17) (18) (19) (20) in accordance with the shape of.