Method for detecting depression amount of laser stitch welding seam based on line structured light sensor

A technology of line structured light and detection method, which is applied to instruments, measuring devices, and optical devices, etc., can solve the problems of inability to meet the production inspection rhythm, low detection efficiency, etc., and achieves low processing unit requirements and good robustness. , the effect of easy miniaturization

Active Publication Date: 2018-04-10
CRRC CHANGCHUN RAILWAY VEHICLES CO LTD
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  • Abstract
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Problems solved by technology

[0005] In order to solve the problems of low detection efficiency in the existing laser stitch welding seam detection technology and the inability to meet the needs of the pro

Method used

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  • Method for detecting depression amount of laser stitch welding seam based on line structured light sensor
  • Method for detecting depression amount of laser stitch welding seam based on line structured light sensor
  • Method for detecting depression amount of laser stitch welding seam based on line structured light sensor

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specific Embodiment approach 1

[0032] Specific implementation mode one, combination Figure 1 to Figure 6 In this embodiment, the method for detecting the concave amount of the laser stitch welding seam based on the line structure light sensor will be described when there is a gap between the two plates of the stitch welding joint ( figure 1 As shown), the surface of the weld will have a depression, and the amount of depression will directly affect the performance of the welded joint; figure 2 It is a schematic diagram when the line structure light sensor is used for scanning. The tooling ensures that the laser line is perpendicular to the weld direction when the light plane sensor is scanning. The amount of depression h( image 3 ) Is defined as the vertical distance from the surface of the workpiece to the bottom of the weld groove.

[0033] In actual measurement, it may appear as Figure 4 , Figure 5 The situation shown needs to be taken into consideration when designing the detection algorithm. Figure 4 ...

specific Embodiment approach 2

[0050] Embodiment 2. This embodiment is an example of the method for detecting the concave amount of the weld seam of laser stitch welding based on the line structure light sensor described in the embodiment 1: the line structure light sensor measures a certain laser overlap welding at a certain time Welds, the coordinates of the feature points obtained are P 1 (5,0), P 2 (15,-1), P 3 (15.5,-1.63), P 4 (16,-1), P 5 (26.01,-0.12), the feature point coordinates include Figure 4 The problem that the surface of the workpiece is not parallel to the bottom surface of the sensor, and Figure 5 The problem that the surface of the workpiece on both sides of the overlap welding seam is not parallel, according to the foregoing invention content (unit mm), then

[0051]

[0052]

[0053]

[0054]

[0055]

[0056] h=-0.61

[0057] According to this algorithm, it can be calculated that the concave amount of the laser stitch welding seam at the detection position at this time is 0.61mm. It can...

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Abstract

The invention discloses a method for detecting the depression amount of a laser stitch welding seam based on a line structured light sensor, relates to the technical field of laser stitch welding seamdetection, and solves the problem that the existing laser stitch welding seam detection technology has a low detection efficiency and cannot meet the requirements of the production delivery-check cycle and the like. A line structured light sensor is used to measure feature points P1, P2,..., P5 of a surface shape of a laser stitch welding seam; and obtained measurement points are represented by aline segment P1P2 and a line segment P4P5, coordinates of the feature points P1, P2, P4 and P5 are substituted into formulas f1(x) and f2(x), an intersection point Q1 between the line segment P1P2 and the line segment P4P5 is solved, a midpoint Q2 of the line segment P2P4 is solved based on the feature points P2 and P4, coordinates of a midpoint Q3 of a line segment Q1Q2 and coordinates of the feature point P3 are solved, and the depression amount h of the laser stitch welding seam to be detected is solved. The method can replace a traditional dial indicator measurement method so as to have obvious advantages in detection efficiency, detection accuracy, and operation intensity, and also facilitates the miniaturization and integration of detection equipment.

Description

Technical field [0001] The invention relates to the technical field of laser overlap welding seam detection, and in particular to a method for detecting the amount of depression of a laser overlap welding seam based on a line structure light sensor. Background technique [0002] Laser welding joint is a common joint type in the structure of new railway passenger cars. Due to the influence of the assembly gap, the problem of concave weld surface often occurs. Studies have shown that for a certain combination of plate thicknesses, the amount of weld depression can meet the load-bearing requirements without exceeding a certain threshold. Therefore, the weld depression detection of laser overlap welding can be used as an important basis for evaluating weld performance. One. However, there is no accurate, fast, and convenient detection method. However, the traditional dial indicator measurement method has low detection efficiency and is difficult to meet the demand of production insp...

Claims

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Application Information

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IPC IPC(8): G01B11/30
CPCG01B11/30
Inventor 李凯何广忠刘立国王春生
Owner CRRC CHANGCHUN RAILWAY VEHICLES CO LTD
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