JP3508084B2 - Jig for surface defect inspection - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface defect inspection jig for determining the size of a defective portion on the surface of an object to be inspected after processing, and particularly to an object to be inspected after being coated. The present invention relates to a surface defect inspection jig capable of accurately determining the size of a small depressed portion on a coated surface and determining quality.

[0002]

2. Description of the Related Art Generally, in a product production factory, quality of a processed product is judged by quality inspection. For example, on the painted surface of a painted panel of an automobile, a small dent-shaped defect called "butsu" may occur due to the generation of air bubbles or the inclusion of dust during the painting process. In order to detect this, a means of using an optical device such as a camera has recently been proposed, but in the actual situation at the site, the operator still often relies on the visual judgment.

An automobile paint panel has an appearance rank (reference value of particle size of defective portion) depending on the position where the defective portion is generated.
However, as shown in Table 1, the parts that are more visible to people than the roof except the front side, especially the bonnet, are among the most strict criteria.

[0004]

[Table 1]

[0005]

Conventionally, the size (particle size) of a small dent-shaped defect portion generated on the surface of an object to be inspected
Was judged based on the experience and intuition of the operator, and the quality was judged according to the site where the surface defect shown in Table 1 occurred. Therefore, there is a tendency that the judgment standard is ambiguous due to individual differences among workers and the quality is not stable. Due to this, even if the standard is satisfied in each inspection process, it causes a situation in which the inspection in the final process of the product fails.

The present invention solves this conventional problem,
It is an object of the present invention to provide a surface defect inspection jig that allows an inexperienced operator to accurately determine the size of a defective portion on the surface of an object to be inspected after processing without relying on intuition.

[0007]

In order to achieve the above object, the present invention provides a criterion for determining the size of a defective portion on the surface of an object to be inspected after processing between two opposing sides of a frame. A visual inspection wire having a wire diameter of

In this surface defect inspection jig, a plurality of lines of visual judgment wires having different reference wire diameters are arranged side by side, and the color of the object to be inspected is determined. In order to facilitate visual judgment in accordance with the light and shade, it is characterized in that the material or color of the visual judgment wire is different, for example, a steel wire and a silkworm thread are used.

Furthermore, a short distance is provided between the lower end of the frame body that abuts on the surface of the object to be inspected and the stretched position of the visual judgment wire, or the visual judgment wire is visually judged to be positioned in the vertical direction. It is characterized by arranging auxiliary wires for use, in addition to burying magnets at four corners of the frame, or pivotally attaching rollers.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. (A) and (b) of FIG.
It is the top view and side view which show about 1st Embodiment of the jig | tool for surface defect inspection which concerns on this invention. 2A and 2B are a plan view and a side sectional view showing a state in which visual determination is performed using the jig for surface defect inspection shown in FIG. 1.

In FIG. 1, a surface defect inspection jig J is
It is composed of a frame body 1 and a visual determination wire (hereinafter referred to as a wire) 2 stretched over the frame body 1. The frame 1 is
It is made of plastic, rubber, or metal and is processed into a rectangular shape, and is of a size that can be carried by a worker by hand. The shape is not limited to a rectangle and may be a polygon or a circle. Wire 2
It is stretched between two opposite sides 1a and 1b of the frame body 1. Specifically, the frame body 1 is inserted into and fixed to a hole formed at a predetermined position of the frame body 1, or is attached to an upper portion of the frame body 1. It is provided by means of screwing a bolt and winding it around it. The material of the wire 2 is not particularly limited, but a steel wire (wire) or a silkworm thread (tegu) used for fishing line is easily available and suitable.

A plurality of wires 2, four wires in the illustrated example, are arranged side by side in the frame 1 at intervals, and the wire diameters thereof are different from each other. That is, the first wire 2a from the left side
Is 0.3 mm, the second wire 2b is 0.5 mm, the third wire 2c is 0.7 mm, and the fourth wire 2d is 1.0 mm. Each wire 2a-
As will be described later, 2d serves as a reference for determining the size (particle size) of the defective portion on the surface of the painted panel 3 of the automobile, which is the inspected object after processing. Magnets 4 are embedded in the four corners of the frame body 1, respectively.

The above-mentioned surface defect inspection jig J aligns a predetermined wire in the wire 2 with a small dent-shaped defect portion existing on the surface of the coating panel 3 of the automobile, and the coating panel of the automobile. 3 is mounted on the surface. Figure 2 (a)
6B and 6B are a plan view and a side sectional view of this mounted state, which are shown in an extremely enlarged manner for easy understanding. This figure shows an example of trying to determine the size of a defective portion that has occurred in the bonnet, which requires a strict determination standard even in the paint panel 3 of an automobile, and has a reference wire diameter of 0.3 mm directly above the defective portion 5a. The operator mounts the surface defect inspection jig J so that the wire 2a is positioned.
At this time, the magnets 4 embedded in the four corners of the frame body 1 are attracted to the paint panel 3 of the automobile to prevent the hand from shaking, which facilitates the work. In the case shown in the figure, when the operator compares the defective portion 5a and the wire diameter of the wire 2a with each other visually, the defective portion 5a is clearly protruding from the wire diameter of the wire 2a, and the defect portion is larger than the reference. Judged as good product. In order to pass this inspection, it is required that the wire diameter is equal to or smaller than the wire diameter of the wire 2a as indicated by another defective portion 5b.

In such a visual inspection by the operator, the error due to the viewing angle increases as the defective portion 5a and the wire 2a are separated. Therefore, in order to prevent this, the distance between the defective portion 5a and the wire 2a, that is, the distance s between the lower end of the frame 1 and the tensioned position of the wire 2a is set to a close distance, specifically, about 4 to 8 mm. It is valid.

In the first embodiment, four wires 2 are arranged side by side on the frame body 1 at intervals so as to correspond to the size of the defective portion generated at each portion of the painting panel 3 of the automobile. The case of applying the wires 2a to 2d has been described. I don't care.

FIGS. 3A and 3B are a plan view and a side view showing a second embodiment of the surface defect inspection jig J according to the present invention. In this embodiment, the wire 2 is provided between two opposing sides 1a and 1b of the frame body 1 at intervals, for example, a group 2A of four wires 2a to 2d made of steel wire, and a silkworm thread. 4 wire 2
The group 2B of e to 2h is stretched. In this way, the wires of the two groups 2A and 2B are made of different materials,
When the coating color of the coating panel 3 of the automobile is a light color system, a group 2A of steel wires 2a to 2d, and when it is a dark color system, a group 2B of wires 2e to 2h made of Tiansil silk thread. By using, it is possible to perform visual determination with higher accuracy. Further, the color of each wire may be different according to the coating color. The first wire 2a, 2e from the left in each group 2A, 2B is 0.3 m
m, the second wire 2b, 2f has a wire diameter of 0.5 mm, the third wire 2c, 2g has a wire diameter of 0.7 mm, and the fourth wire 2d, 2h has a wire diameter of 1.0 mm, and Similar to the first embodiment, a predetermined wire in the wire 2 is aligned with a small dent-shaped defective portion existing on the surface of the painting panel 3 of the automobile to determine its size.

In the second embodiment, the magnets 4 are embedded in the four corners of the frame body 1 in the first embodiment, respectively, while the rollers 4'are attached to the four corners of the bottom surface of the frame body 1 in an axial direction. The surface of the painted panel 3 is slid to facilitate the work. Of course, the roller 4'may be used in the first embodiment.

FIG. 4 is a side view showing another example of the case where visual judgment is performed using the surface defect inspection jig J according to the present invention. In this example, another frame body 1'is arranged above the frame body 1, and the wires 2a to 2d and 2e to 2h of each of the groups 2A and 2B are arranged in the vertical direction for visual determination. Auxiliary wires 2a'-2d 'and 2e'-2h' are stretched. When performing visual determination, the surface defect inspection jig J is placed on the surface of the coating panel 3 of the automobile, and in the example of the figure, the defective portion 5, the wire 2d, and the visual determination auxiliary wire 2 are placed.
The line of sight is matched with the line of sight of the operator with d'as the same axis. This makes it possible to make a more accurate determination without causing an error due to the viewing angle between the defective portion 5a and the wire 2d. The visual judgment by combining the visual judgment wire and the visual judgment auxiliary wire can be applied to both the first and second embodiments.

[0019]

As described above, according to the surface defect inspection jig of the present invention, the surface defect inspection jig is provided between two opposing sides of the frame body.
Since the visual judgment wire having the reference wire diameter is stretched, it is possible to directly judge the size of the defective portion on the surface of the inspected object after processing by comparing with the visual judgment wire. Therefore, it is possible to eliminate the ambiguity of the judgment criteria by making a judgment based on the experience and intuition of the worker as in the conventional art, and it is possible to make an accurate judgment even for a worker with little experience.

[Brief description of drawings]

1A and 1B are a plan view and a side view showing a first embodiment of a surface defect inspection jig according to the present invention.

2 (a) and 2 (b) are a plan view and a side sectional view showing a state in which visual determination is performed using the surface defect inspection jig according to the present invention.

3A and 3B are a plan view and a side view showing a second embodiment of a surface defect inspection jig according to the present invention.

FIG. 4 is a side view showing another example of a case where visual judgment is performed using the surface defect inspection jig J according to the present invention.

[Explanation of symbols]

1 ... frame 2 ... Visual judgment wire 3… Inspection object (painted panel of automobile) 4 ... Magnet 4 '... Laura 5 ... Defect part

Claims (8)

(57) [Claims] 1. A visual judgment wire having a reference wire diameter for judging the size of a defective portion on the surface of an inspected object after processing is stretched between two opposing sides of a frame body. A special jig for surface defect inspection. 2. The jig for surface defect inspection according to claim 1, wherein a plurality of lines of visual judgment wires having different reference wire diameters are arranged in parallel at intervals. 3. The surface defect inspection according to claim 1 or 2, wherein the visual judgment wires are made of different materials or colors in order to facilitate visual judgment according to the shade of color of the inspection object. Jig. 4. The surface defect inspection jig according to claim 3, wherein the visual judgment wires made of different materials are a steel wire and a silkworm thread. 5. The surface defect inspection according to claim 1, wherein a close distance is provided between a lower end portion of the frame body abutting on the surface of the inspection object and a stretched position of the visual judgment wire. Jig. 6. The surface defect inspection jig according to claim 1, wherein the visual determination auxiliary wire is arranged so that the visual determination wire is positioned in the vertical direction. 7. The jig for surface defect inspection according to claim 1, wherein magnets are embedded in the four corners of the frame body. 8. The surface defect inspection jig according to claim 1, wherein rollers are axially attached to the four corners of the bottom surface of the frame body.