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Steel plate weld zone inspection system（ It‘s quality maintenance by a laser! ）

ISC Inc.

http://www.isc-net.co.jp

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１． Outline

　　 This system is a system to inspect the junction state of a steel plate weld zone by laser metrology apparatus.

When judgment can perform the state of a junction by evaluation, the inspection by laser metrology is preparing a threshold value, and can perform quality maintenance more than [ a certain ] fixed.

The inspection system of proposal makes the sample article the subject of examination.

About a real introduction machine, I will consult based on these data.

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２． Measurement evaluation-Ⅰ　　　 As this system examination, the following measurement was

performed with the sample. 2.1 Measurement use equipment The camera for laser metrology, a tele centric lens, blue laser light, an encoder, a set of personal computers

2.2 Test measurement mechanism

　

Laser illuminator

The camera for laser metrology

Encoder

Carrier machine

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PC

LAN

Conveyance

Laser light

sample

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２． Measurement evaluation-Ⅱ　 2.3 An article to be examined

Your company steel-materials weld zone article sample.

2.4 The contents of an inspection

・ After setting a sample to a conveyance stage, while a conveyance stage drives, irradiate with laser light, and picturize with a laser metrology camera. The timing of an image pick-up takes in by the pulse signal and camera from an encoder accompanying a conveying machine synchronizing.

・ the range to be examined conveys the range to be examined by a mechanism, where laser light is intersected in a welding connection part -- as Laser light is set up. - Control of the camera for laser metrology uses the evaluation software of maker supply, and is taking in of data.

・ Measurement carries out laser metrology of the one welding connection sample, and is a junction state of the solvent of a welding connection part by evaluation software. The value (depth information) of the direction of Z is saved at a file..

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Sample

The laser conveyance direction

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２． Measurement evaluation-Ⅲ　 2.5 Measuring result

The measuring result is as follows. The following screen shows the depth (the degree of welding) of welding of the graph displayed under the picture by the display after laser metrology in the sample. Two screens show the degree of welding of another position on　a　sample　(depth)　in　the　graph.　

　 The blue of the above-mentioned graph shows the form (change of a weld zone is large)

on the white line of a picture. The above-mentioned orange shows the form (weld zone change is small) on the white line of a picture, and the difference of change of a weld zone understands it in the blue of a graph, and an orange circle portion.

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２． Measurement evaluation-Ⅳ　　 Change of the weld zone of a front page indicated the large portion.

　　 A graph is a portion with the large amount of change (blue) which shows the amount of change of the white line (laser scanning part) on a picture. A round mark is in the state of the weld zone depth. In actual processing, coded data is received from a camera, and it is measurement form. In more than a threshold value, NG and judgment of a weld zone are possible in the amount of change.6

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２． Measurement evaluation-Ⅴ　　　 Change of the weld zone of a front page indicated the small portion.

　　 A portion (orange round mark) with the small amount of change of a graph is in the state of a weld zone. In this case, measured value is below a threshold value. It can judge.

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３． About utilization of a laser metrology system

I give the example of a mechanism in the case of using a laser metrology system for below by practical use.

The height information on the laser irradiation portion of parts is obtained for the parts set to the conveyance stage

(conveyance conveyor) as shown in a figure by stage movement.

A conveyance stage changes a size with the size of parts. This mechanism needs mechanism examination for carrying

in and taking out of parts separately according to the flow on employment because of off-line.

Laser camera

Laser light

Inspection department article

Conveyance conveyor (Inspection stage)

Examining table The example of a laser

inspection system. 8

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４． Laser system basic configuration

Basic configuration

4.1 Camera For Laser Metrology The multi-camera corresponding to laser

4.2 Lens I change by the image pick-up range. ?

4.3 laser apparatus Projection distance: 50 ～ 200 ㎜ , line width: 20 ～ 25 μm

4.4 Controller for Control I customize according to employment.

4.5 Laser Metrology Software According to employment, I customize inspection processing.

4.6 Verifier According to employment, I change a verifier. • I indicate the spec. of the camera used as a present condition

object, and laser apparatus in the 5th clause.

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５． Apparatus spec. table

5.1 Laser Metrology Camera - The resolution of 2 million pixels / full frame maximum 358 profiles / second - - The pixel size of 5.5x5.5 micrometers, and resolution (HxV pixel)

The minimum resolution of 2048x1088 and the height direction: 35 micrometers

per pixel 50 micrometer, and global shutter CMOS - - 3D data arithmetic processing function - - 2 laser simultaneous luminosity detection function - - Power consumption (W) Six or less - a size (WxHxD ㎜ ) 55x55x51.5

5.2 Laser Apparatus - Projection distance 50 Ｘ 200 - - Pattern size Line length 50mm/WD50 The line width of 20 micrometers or less

(blue laser), 25 micrometers or less (red laser) - - Optical power 5 mW or more of exit wounds CLASS2 and the degree of

luminosity uniform Less than ±10% - - Oscillation wavelength 406 nm or 660 nm - - Power supply voltage and current DC12V 50 / 80 mA

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