JPH03495A - Instrument for inspecting joined part - Google Patents

Abstract

PURPOSE:To enable inspection of quality of sticking shape by inspecting silhouette at joined part in a work as picture signal with image pickup means and inspection means and judging whether outer circumferential boundary line at sticking part of the joining material is in the adequate range or not. CONSTITUTION:A body part 1a and pin 1b in the work are welded and joined by using the prescribed joining material to form the work 1. An illumination 3 and camera 4 constitute the image pickup means and the illumination 3 projects the joined part in the work 1 as the silhouette, and the above silhouette is picked up with the image pickup camera 4 set so as to sandwich the carrying passage 2 therebetween. A picture processor 5 and control unit 6 constitute the inspection means and silhouette picture signal from the above camera 4 is inputted to the picture processor 5, and the signal showing the inspection result from this processor 5 is impressed in the control unit 6. By this method, the quality of the joined part is decided and the inspection efficiency is improved and also the quality of the work can be improved by eliminated oversight of the product to be rejected.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a joint inspection device that inspects the joint state of a workpiece formed by joining a plurality of parts through a predetermined joining process.

(Prior Art) In recent years, attempts have been made to automatically join multiple parts of a workpiece using predetermined joining processes such as copper fusion and welding. On the other hand, visual inspection is generally used as a means for inspecting the joint state of the workpieces after the workpieces are mounted on the stand.

(Problem to be Solved by the Invention) However, in the above-mentioned automatic joining line, the inspection interval is short, for example, one workpiece is inspected every few tens of seconds, so conventional visual inspection means are insufficient. Not only is eye fatigue a problem, but there are also problems with inspection quality, such as overlooking rejected products.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a joint inspection device that can automatically inspect workpiece joints without visual inspection, and can also improve inspection quality.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a workpiece formed by joining a plurality of parts by a joining process using a predetermined joining material. In a joint inspection device that performs an inspection process of inspecting a bonded state, an imaging device that images a silhouette of a bonding material bonded portion in a bonded portion of the workpiece and outputs an image signal of the projected silhouette of the bonding material bonded portion; means, and an inspection means that performs predetermined image processing on the silhouette image signal output from the imaging means to determine whether the outer circumferential boundary line of the bonding material fixed portion at the workpiece joint is within an appropriate range. It has a configuration that includes:

(Function) In the means having such a configuration, the silhouette of the joint part of the workpiece is inspected as an image signal by the imaging means and the inspection means, and the outer circumferential boundary line of the part to which the bonding material is fixed in the workpiece joint part is within an appropriate range. The adequacy of the bonding shape of the bonding material is inspected by determining whether or not the bonding material is in the .

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

In the joint inspection device in the embodiment shown in FIG.
After the copper welding process, the workpiece 1 is transferred to a predetermined conveyance path 2.
being transported inside. The work 1 is formed by joining the pins 1b of the main body portion 1a in the copper welding process. In the middle of the conveyance path 2, there are a lighting 3 that projects the joined part of the workpiece 1 as a silhouette, and a camera 4 that images the silhouette of the workpiece 1 projected by the lighting 3.
are arranged to face each other with the conveyance path 2 in between. The illumination 3 and camera 4 constitute an imaging means.

The silhouette image signal from the camera 4 is input to an image processing device 5. Further, an inspection start signal is applied to the image processing device 5 from the control device 6, and a signal representing the inspection result from the image processing device 5 is applied to the control device 6. The image processing device 5 and the control device 6 constitute inspection means, and perform predetermined image processing on the silhouette image signal output from the image pickup means to check the adhesion of the bonding material at the joint portion of the workpieces, as will be described later. It has a function of determining whether or not the outer circumferential boundary line of a portion is within an appropriate range, and determining whether or not the portion to which the bonding material is fixed is acceptable.

An inspection procedure using such an apparatus will be explained with reference to FIG. First, the joint portion of the workpiece 1 is projected by the illumination 3 as a silhouette with a black image on a white background, for example. This silhouette image of the workpiece 1 is captured by the camera 4, and the camera 4
A silhouette image signal is input to the image processing device 5 from.

In the image processing device 5, in step 101, the "-" silhouette image data is converted into binary image data of bright and dark, and a third
A processing area (window) A is set as shown in the figure. This processing area (window) A is the work 1 above.
Copper fixed part B as a bonding material fixed to the joint part of
be set to a size and position that covers the area.

Furthermore, in step 102 in FIG. 2, the processing area (
Window) Coordinate data (x, y
) is required. Specifically, as shown in Fig. 4, n is determined by searching the binarized image data in the X direction on a predetermined y position to find the X coordinate of the right end of the black image, that is, the point that is the boundary of the silhouette Figure O
The coordinate data of the mark) will be obtained.

Next, in step 103, among these boundary point data, the position corresponding to the data where xo is the maximum and yn is the minimum is set as the reference position y. This standard position y
. is a position representing the negative end of the body portion 1a of the work 1. Further, among these boundary point data, the position corresponding to the data where Xn is the minimum is set as the reference position X. This reference position X.

is a position representing the right end of the bottle portion 1b.

Furthermore, as shown in Fig. 4, Ω1 is set according to the size of the copper-fixed portion B, and the difference d1 between the boundary point data Xl at a position 91 apart from the above yo and the above reference position X is calculated. It will be done. If copper is sufficiently adhered to the copper-fixed portion B, the above difference d.

Therefore, in step 104 of FIG. 2, the value of the difference d1 is compared with the threshold value , and the difference d1 is
If it is larger than the threshold value D1, it is determined to pass and the process proceeds to the next step 105. If not, it is determined in step 108 that no adhesion has occurred or there is insufficient adhesion, and the result is rejected (NG).

Next, as shown in Fig. 4, X of each boundary point data
The position C where the value is the minimum and the value yn is the maximum is determined, and the binarized image data at each X position is searched in the y direction to determine the y coordinate of the upper end of the black pixel. Then, among these data, the position corresponding to the data where y is the maximum (marked by X in FIG. 4) and X is the minimum is found. Then, in step 105 in FIG.
A straight line E obtained by connecting 1D is obtained.

Further, in step 106, the difference d between each of the boundary point data (x, y) within the CD range and the above-determined straight line E is calculated, and among these differences d, the difference d2 that is the largest in terms of absolute value is Desired. If the copper is sufficiently attached, the difference d2 should be small, but in step 107, the value of the difference d2 and the threshold D2 are compared, and if the difference d2 is smaller than the threshold D2, the result is passed (OK) in step 108. ), and if this is not the case, it is determined that the adhesion has not been carried out or the adhesion is insufficient and is judged to be rejected (NG).

In Fig. 5, the workpiece 1 is so-called by fillet welding.
The figure shows a state where the joint is stacked, but in such a case, the difference d3 between the straight line E and the outer boundary of the joint is large and convex, so it is immediately rejected. (NG) is determined.

In this way, a signal representing the determination result of pass (OK) or fail (NG) in step 108 is applied to the control device 6.

(Effects of the Invention) As described above, the present invention images the part to which the bonding material is fixed at the joint of the workpiece as a silhouette so that the suitability of the shape of the bonding material to the workpiece is inspected, and from this silhouette image, the workpiece is bonded. Since the present invention is equipped with a means for determining whether the outer circumferential boundary line of the part to which the bonding material is fixed at the part is within the appropriate range, the inspection of the workpiece joint can be performed automatically without visual inspection.
In addition to improving inspection efficiency, it is possible to eliminate oversight of rejected products and improve inspection quality.

[Brief explanation of the drawing]

Fig. 1 is an external perspective explanatory diagram showing a joint inspection device according to an embodiment of the present invention, Fig. 2 is a flow diagram showing an inspection control procedure in the present invention, and Fig. 3 is a silhouette image of a workpiece joint. FIGS. 4 and 5 are image explanatory diagrams showing the entire silhouette image in a partially enlarged manner. 1... Workpiece, 1a... Main body, 1b... Bin,
2...Transportation path, 3...Lighting, 4...Camera, 5
...Image processing device, 6...Control device.

Claims (1)

[Claims] In a bonding member inspection device attached to a workpiece in which a plurality of parts are bonded together by a bonding process using a predetermined bonding material, the bonding state of the bonding material at the bonded portion of the workpiece is inspected. an imaging means for projecting a silhouette of the part to which the bonding material is fixed at the part and outputting a silhouette image signal of the projected part to which the bonding material is fixed, and performing predetermined image processing on the silhouette image signal output from the imaging means, 1. A joint inspection device comprising: an inspection means for determining whether or not an outer circumferential boundary line of a portion to which a bonding material is fixed falls within an appropriate range.