Plastic thermal riveted assembly monitoring method and device

Abstract

The invention relates to the technical field of automobile part detection, in particular to a plastic thermal riveted assembly monitoring method and device. The method comprises the steps that a to-be-detected workpiece is conveyed to a uniform optical detection view field position by using an auxiliary conveying and positioning module; a powerful alignment light source module shines obliquely togenerate a shadow region, and image collection is conducted by using a camera module; it is judged whether the to-be-detected workpiece is qualified or not through image analysis, and quality evaluation is conducted on the welding conditions through an SVM classifier. By means of the plastic thermal riveted assembly monitoring method, it can be achieved that missing installation, defect identification and quality evaluation of finished products and semi-finished products of automobile doors and other parts can be quickly monitored at a high precision on line, and the production efficiency andquality of an automatic assembly line are improved.

Description

technical field [0001] The invention relates to the technical field of auto parts detection, in particular to a plastic thermal riveting assembly monitoring method and device. Background technique [0002] With the extensive use of plastics in automobile lightweighting, the quality judgment of plastic riveting products is very important. Among the common assembly techniques, plastic hot riveting assembly is a relatively simple, cheap, and efficient permanent fixing assembly method, which can realize riveting and fixing at multiple points at the same time, without additional parts, fillers and other costs. However, for interior and exterior trim parts such as automobile door panels and instrument panels, the surface quality requirements are high and the structure is complex. During the assembly process, defects are easily formed due to welding process parameter control and positioning errors. Especially in China, manual welding is still mainly used. Assembly-based, resulting...

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Problems solved by technology

However, for interior and exterior trim parts such as automobile door panels and instrument panels, the surface quality requirements are high and the structure is complex. During the assembly process, defects are easily formed due to welding process parameter control and positioning errors. Especially in China, manual welding is still mainly used. Assembly-based, resulting in common welding defects or poor assembly quality in final products

In view of the problems referred to above, patent CN106078153A (electric car door structure and its assembly device and assembly and detection method) proposes a car door design and a detection method corresponding to the design form of the car door, but does not involve optical detection technology; patent CN103245263A (a car door Door guard assembly detection aids and detection methods), although it involves mirror optical elements, its detection is mainly for the convenience of observation through human operation, and does not involve image acquisition and analysis work, and the form is also quite different ;The document "Application of Infrared Thermal Imaging Technology in Quality Inspection of Hot Riveting Products" (Journal Source: Science and Technology Communication, Author: He Lulu, Ren Zizhen, 2015) clearly pointed out that the infrared detection technology is used instead of the ordinary camera used in this patent One of the reasons is that the image target and background color collected by ordinary visible light cameras are consistent, which will lead to unclear edges between the target and the background

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