JPS63115038A - Inspecting method for foamed metal plate - Google Patents

Abstract

PURPOSE:To easily and accurately detect a color irregularity, etc., on the surface of a foamed metal plate by using a CCD camera by placing the foamed metal plate on a conveyance surface together with the auxiliary foamed metal plate of the same good material with the former plate, and then inspecting it. CONSTITUTION:A plate T1 to be inspected which is the foamed metal plate and an auxiliary inspection plate T0 which is the foamed metal plate of the same material with larger area are mounted on the conveyance surface (a) of a work table 1. Then, a reflected light beam H is made incident on the CCD camera 5 from the plate T1 to be inspected which is being conveyed and the output of the CCD camera 5 is processed by a computer to detect the surface state of the plate T1 to be inspected. Here, the auxiliary inspection plate T0 of the same material with the plate T1 to be inspected it mounted on the conveyance surface (a) of the work supply table 1 together with the plate T1 to be inspected, so the difference between a transmitted light beam and the reflected light beam becomes clear according to the surface state of the plate T1 to be inspected and the image signal S of the CCD camera 5 varies greatly, thereby clearly detecting a defect in the surface state of the inspected plate T1.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a metal plate surface inspection method for detecting defects on the metal plate surface. More specifically, the present invention relates to a method for inspecting the surface of a semi-transparent foamed metal plate having a large number of small holes.

O Prior art A workpiece (metal plate) to be inspected is placed on a workpiece supply table having a stirring means, and the workpiece is illuminated from above the workpiece supply table to check the surface condition of the workpiece being transferred on the workpiece supply table. , one-dimensional device for solids! Inspection methods using a CCD camera (CCD camera) and a computer are known.

O Problems to be Solved by the Present Invention In the above-mentioned known inspection methods, when inspecting the surface of a foamed metal plate, there is no change in the reflected light entering the CCD camera in the presence of yellowing or color unevenness, so the surface color cannot be detected. It has the disadvantage that it cannot detect defects.

The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to detect irregularities in color and the like on the surface of a foamed metal plate quickly and accurately using a CCD camera.

Means for Solving Problems The present invention provides a method for inspecting the surface of a foamed metal plate using a CCD camera and a computer. This special foam metal plate inspection method is characterized in that a non-defective foam metal plate of an employee is placed on a conveyance surface together with an auxiliary metal plate for inspection.

Embodiment 1 FIG. 1 shows a metal surface inspection apparatus for carrying out the present invention, in which a workpiece supply stand (transferring an object to be inspected) includes a conveying means 2 having a conveying surface a, and a DI means 3 on the drive side of the conveying means. bag ra
) 1, illumination device 4, CCD camera (photoelectric conversion element combination in which a plurality of charge conversion elements are arranged in parallel in the imaging area,
For example, a charging conversion camera with a CCD image sensor)
5, an image No. 13 S of Digital No. 13 showing the surface condition of the inspection target plate T□ of the foamed metal plate is obtained, and the image No. 13 S
The computer processing is similar to the conventional device.

6 is a power supply device for the CCD camera 5, and 12 is a high frequency power supply for the illumination device 4.

In the example, computer processing of image No. 13 S is carried out by II
An elephant-sized input device 7, a memory board 9, a microcomputer (C, P, U) 8 with a keyboard 10 of 1 inch 22, and a monitor television 13
．． 14. Consists of a printer 11 for output, and inspects the board T□
Although the surface condition is numerically displayed by the printer 11,
The output of the microcomputer 8 can also be configured to operate an alarm device and a conveyance direction switching device to automatically alarm and automatically exclude defective products.

In carrying out the present invention, the above-mentioned metal plate surface inspection apparatus is used. As shown in FIGS. Auxiliary inspection 12 of the metal plate is placed on the conveyance surface a of the work table 1 together with the plate T1.

In the first embodiment shown in FIGS. 1 and 2, the test board T is placed above the auxiliary test board T, but in the second embodiment shown in FIG. A window with a slightly larger area than the inspection board T1 is provided on the auxiliary inspection board Tll, and the inspection board T1 is inserted into the window of the auxiliary inspection board T, so that they are on the same plane as shown in FIG. Inspection is carried out in the state.

Further, in the embodiment, in addition to the illumination cover 4a, the illumination device 4 is provided with an internal illumination gar 40 located inside the lamp 4b to prevent the light from the lamp 4b from directly entering the CCD camera 5. , the configuration is such that only the reflected light beam H from the vertical plate T-work to be inspected enters the CCD camera 5, and the CCD
Increased the sensitivity of camera 5.

In the present invention, similarly to the conventional metal plate surface inspection method using a metal plate surface inspection plate, a reflected light beam H is incident on a CCD camera 5 from a foamed metal plate to be inspected T being transferred, and the output of the CCD camera 5 is The surface condition of a foamed metal plate to be inspected is detected by computer processing, and the present invention performs an auxiliary inspection of a foamed metal plate made of the same material when inspecting the surface condition of a foamed metal plate. By placing the plate T together with the plate T to be inspected on the conveyance surface a of the work supply table 1, the difference between the transmitted light ray H and the reflected light ray) is determined by the surface condition L! of the plate T1 to be inspected (for example, , color unevenness), and C
The image taken by the CD camera 5 (No. 3 S changes more markedly), making it possible to clearly detect defects in the surface condition of the foamed metal plate.

O Effects of the Invention The present invention provides a method for inspecting the surface condition of a translucent foamed metal plate to be inspected.
By increasing the reflected light beam from the inspection board to the CCD camera,
Poor CD camera surface condition (color unevenness, yellowing, cracks, etc.)
It has the effect of reliably detecting defects such as scratches, cracks, etc.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the outline of a foamed metal plate surface inspection device. FIG. 2 is a partial cross-sectional view showing the main parts. FIG. 3 is a perspective view showing an inspection method according to a second embodiment of the present invention. FIG. 4 is also a longitudinal sectional view. 1... Work supply table 4... Lighting device 5... CCD camera 7... Image input device 8... 1... Microcomputer T... ...Inspected plate TII of foamed metal plate...
・・Auxiliary inspection Mi (foamed metal 5#j made of the same material as the board to be inspected)

Claims (1)

[Claims] Foamed metal plate inspection in which the surface of the foamed metal plate to be inspected is transported, illuminated and photographed with a CCD camera, and the output from the CCD camera is processed by a computer to detect the surface condition of the foamed metal plate to be inspected. The method is characterized in that a foamed metal plate to be inspected is placed on a conveying surface together with an auxiliary inspection plate of a non-defective foamed metal plate made of the same material as the foamed metal plate to be inspected. Foamed metal plate inspection method.