JPH08136475A - Surface observing apparatus for plate-like material - Google Patents

Abstract

PURPOSE: To easily find defects regarding the evenness of a plate-like material and observe the defects. CONSTITUTION: Regarding a surface observing apparatus for a plate-like material by which the surface of a plate-like material is observed in one end parts of a pair of arm members 1a, 1b by overlapping the arm members 1a, 1b while a gap being kept between them, joining the other end parts of the arm members, and inserting the plate-like material in the gap; observation windows 2a, 2b equipped with lens 3a, 3b are formed in the same positions of the other end parts of the arm members and the surface defect found by the observation window 2a in the front side and whose position is defined is observed and confirmed by the observation window 2b on the rear side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for finding and observing fine defects generated in, for example, a cold rolled steel sheet,
In particular, with regard to the irregularity defect that the defect generated on one surface of the plate-shaped inspected material is also a defect when viewed from the other surface,
The present invention relates to a device for finding and observing defects by making it possible to easily compare the defects on each surface.

[0002]

2. Description of the Related Art For example, in a cold rolled steel sheet manufacturing process, a strip-shaped steel sheet is subjected to various treatments and finally shipped in the form of a cold rolled coil or a cold rolled sheet. Then, at various stages of the process, surface defects are inspected by visual inspection by an automatic defect detection device or an operator to control the surface quality.

One of the surface defects of a cold-rolled steel sheet is an irregularity defect caused by slight irregularities on the surface of the steel sheet. However, many defects of this kind cannot be detected by the naked eye of the human eye, and a whetstone causes A so-called grindstone inspection method is generally adopted in which the surface is lightly ground to make the defects clear and a visual inspection is performed. An example of the surface defect detected by the grinding stone inspection is shown in FIG.
Shown in R is a roll, D is a foreign substance attached to the roll surface,
S is a plate-shaped material such as a steel plate.

When the foreign matter D adheres to the surface of the roll R, a part of the steel plate S that comes into contact with the roll is pushed up by the foreign matter D, and the back surface in this figure is dented and the surface rises to be convex. Investigate the cause of such defects,
In order to take appropriate measures, it is necessary to find contact marks on the back surface that come into contact with the roll, but usually, such contact marks are often minute as if they were projected with a needle tip, especially the steel plate surface. In the case where a minute unevenness called a dull finish is formed instead of a mirror surface, it is difficult to find out because of the unevenness. Therefore, instead of finding a fine concave defect, a method is employed in which a convex portion of the surface is made visible by a grindstone inspection and captured, and the back surface thereof is observed to locate the defect.

For this purpose, conventionally, for this purpose, a tweezers-like instrument is held so as to sandwich a steel plate, the front end of the instrument is applied to the defect position, and the back surface defect is found at the position indicated by the back end of the instrument. That way was done. However, with this method, the tip of a tweezers-shaped instrument covers a minute defect portion, so the defect portion cannot be directly observed, and the size and shape of the foreign matter that caused the defect occurrence must be specified. There is a problem that is difficult.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to realize a surface observing device for a plate-like material, which allows a defective portion to be easily found and sufficiently observed. And

[0007]

According to a first aspect of the present invention, a pair of arm members are overlapped with each other with a gap therebetween and one end portion is joined, and a plate-like member is inserted into the gap and the other end is joined. Of a plate-shaped material for observing the front and back surfaces of the plate-shaped material at the end of the plate-shaped material, characterized in that an observation window is provided at the same position at the other end of the arm member. Is.

According to the second aspect of the present invention, the arm member having the observation windows (2a, 2b) provided at the same position can be freely moved in and out in the longitudinal direction, and can be rotated in parallel with the surface of the plate-shaped member as a fulcrum member. The plate-like material surface observing device according to claim 1, which is locked. According to a third aspect of the present invention, a pair of arm members are overlapped with each other with a gap therebetween, one end portion is joined, a plate-like material is inserted into the gap, and the other end portion is used for the front and back surfaces of the plate-like material. A surface observing device for a plate-shaped material, the first rail, a second rail perpendicular to the first rail, a first block slidably moving on the first rail, and A second block slidably moving on a second rail, and a first arm attached to the first block in a direction perpendicular to the first rail and provided with a slit having the same width over substantially the entire length. And a second arm that is attached to the second block in a direction perpendicular to the second rail and has slits of the same width provided over substantially the entire length, and a first arm and a second arm. The observation window is formed at the intersection of That is a surface observation apparatus of the plate material.

Further, the present invention according to claim 3 is the surface observation apparatus for a plate-like material according to any one of claims 1 to 3, wherein the observation window is provided with a lens.

[0010]

[Operation] According to the present invention, since the arm members of the same size are superposed, the end portions are joined, and the observation windows are provided at the tip portions, the observation windows on the front and back are always the same on both the front and back sides of the plate-shaped material. It is possible to find and catch a surface defect on the other surface which is difficult to find from a surface defect on one surface which is located and is easy to find. Further, when a lens is attached to the observation window, it becomes possible to magnify and observe a minute defect portion, and it is possible to easily find even a defect buried in fine irregularities of dull finish.

[0011]

【Example】

Example 1 A first example of the present invention is shown in FIG. This figure is a perspective view of the surface position pointing device of this embodiment, in which 1a and 1b are arm members, 2a and 2b are observation windows, 3a and 3b are lenses, and 4 is a joint. Reference numerals 1a and 1b denote a pair of arm members having the same size, which are closely overlapped with each other with a gap therebetween, and one end portion of which is joined as a joint portion 4 in a tweezers shape. At the same position on the other end of the arm members 1a and 1b opposite to the joining portion 4, there is an observation window.
2a and 2b are provided, and lenses 3a and 3b are fitted therein.

An example of use of the surface position pointing device of this embodiment will be described with reference to FIG. 2. A plate-shaped member S is inserted into the gap between the arm members 1a and 1b, and the whole device is observed by moving it while holding it by hand. The window 2a or the lens 3a is used to find and capture a defective portion on the surface of the plate-like material S which is conspicuous by a grindstone method or the like. At this time, since the observation window 2b on the opposite side is on the back side of the same position of this defective portion, the observation window 2b or the lens 3b
By observing the back surface of the plate-like material S, it is possible to find a fine defect portion.

The surface observation apparatus of this embodiment has a simple structure and is easy to handle, but when a defect is found on the surface side, it takes effort to hold the entire apparatus in the same position. It's a little difficult. Embodiment 2 A second embodiment of the present invention is shown in FIG. This is a device in which the surface position pointing device of the first embodiment is attached to a fulcrum member 5, and the fulcrum member 5 can be inserted and removed in the longitudinal direction by inserting at least one of the arm members 1a and 1b, and the fulcrum member 5 Since 5 itself is rotatable by a rotary shaft perpendicular to the surface of the plate-shaped material, the observation window 2a at the tip of the arm material can be positioned at any point on the surface of the plate-shaped material S. The movement status is indicated by an arrow and a chain line. It is the same as in the first embodiment that the defective portion on the surface of the plate-shaped material S is found, and the fine defective portion is found and observed through the observation window 2b on the opposite side.

The fulcrum member 5 or the arm members 1a, 1b
If a scale or a sensor is provided in, the defect position can be read and recorded in the polar coordinate format. Third Embodiment A third embodiment of the present invention is shown in FIG. In this embodiment, two sets of the surface observation apparatus of the first embodiment are used as arms. 8 is a first rail, 7 is a first block that slides on this, 6 is attached to the first block 7 in a direction perpendicular to the first rail 8, and a slit 61 having the same width is provided over substantially the entire length. In the first arm, the first rail 8 is installed, for example, parallel to one side of the plate-shaped material S.

Reference numeral 11 is a second rail, 10 is a second block sliding on the second rail, and 9 is a second rail on the second block 10.
A second arm attached at a right angle to 11 and provided with a slit 91 having the same width over substantially the entire length.
The square observation window 2 is formed at the intersection of the second arm 9 and the second arm 9. It is the same as in the first embodiment that the defective portion on the surface of the plate-shaped material S is found by the observation window 2 on the front side and the minute defective portion is found and observed by the observation window 2 on the back side. It is more convenient if a suitable block is fitted to the observation window 2 and the lens 3 is embedded therein. In Figure 4, the front side,
Although the letters a and b indicating the back side are omitted, the fact that each arm is composed of the same arm member on the front and back sides is the same as in the first and second embodiments.
Is the same as

The first rail 8 and the second rail
If a scale or a sensor is provided on 11, the defect position can be read and recorded in the XY coordinate format.

[0017]

According to the present invention, since the observation window on the back side indicates the same position as the defect position found on the surface of the material to be inspected and the lens can be observed in detail, the cause of the defect occurrence can be found early. It has the excellent effect that treatment can be taken and the surface quality of the product is improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a side view showing a usage example of the first embodiment of the present invention.

FIG. 3 is a front view showing a second embodiment of the present invention.

FIG. 4 is a front view showing a third embodiment of the present invention.

FIG. 5 is a conceptual diagram showing an example of surface defects according to the present invention.

[Explanation of symbols]

 1 arm member 2 observation window 3 lens 4 joint 5 fulcrum member 6 first arm 7 first block 8 first rail 9 second arm 10 second block 11 second rail 61, 91 slit S plate Material

Claims (4)

[Claims] 1. A pair of arm members (1a, 1b) are overlapped with each other with a gap therebetween to join one end portions thereof, and a plate-like material (S) is inserted into the gap to form a plate-like member at the other end portion. In the plate-like material surface observation device for observing the front and back surfaces of the material,
A surface observing device for a plate-like material, which is provided with an observation window (2a, 2b) at the same position at the other end of 1b). 2. An arm member (1a, 1b) provided with observation windows (2a, 2b) at the same position is provided on a fulcrum member (5) so that the arm member (1a, 1b) can freely move in and out in the longitudinal direction and can rotate in parallel to the surface of the plate-shaped material. The surface observing device for a plate-like material according to claim 1, which is locked. 3. A pair of arm members are overlapped with each other with a gap therebetween, one end is joined, a plate-like material (S) is inserted into the gap, and the other end is observed from the front and back surfaces of the plate-like material. A surface observing device for a plate-shaped material, which slidably moves on a first rail (8), a second rail (11) perpendicular to the first rail (8), and the first rail (8). First block (7)
A second block (10) slidably moving on the second rail (11) and the first block (7),
The first arm (6) mounted in the direction perpendicular to the first rail (8) and provided with the slit (61) having the same width over substantially the entire length, the second block (10), and the second arm (6). Of the first arm (6) and the second arm (9), which is mounted at a right angle to the rail (11) and has a slit (91) of the same width provided over substantially the entire length. A surface observing device for a plate-shaped material, characterized in that an observation window (2) is formed at an intersection with 9). 4. The surface observation apparatus for a plate-like material according to claim 1, wherein the observation window (2) is provided with a lens (3).