The glass guide sealing strip is one of the important parts of an automobile, which plays a role in decorating, sealing, compensating for sheet metal errors, and providing a slide for glass. The performance of the glass guide sealing strip will directly affect the customer’s perception of the quality of the automobile. The glass guide sealing strip is clamped in the inner and outer panels of the door window frame and the inner guide rail and then cooperates with the door glass to play a sealing role. However, in the actual loading process, the corner of the guide rail sealing strip often cracks, seriously affecting the appearance and performance of the product. There are many factors that affect corner cracking, such as the design of the corner mold, the vulcanization process conditions for the corner, the unclean end surface, and the difficulty in crosslinking the corner material and the extrusion strip.
The C-pillar corner of the rear door glass guide rail sealing strip of a certain vehicle model cracked during loading. As shown in Figure 1, the cleanliness of the section of the cracked defective part is very good, which can eliminate the possibility of cracking due to insufficient cleanliness. According to the inspection standards and loading process of the guide groove sealing strip, this article determines the standard tolerance of the measurement points from the B pillar to the C pillar, and measures the dimensions of the defective parts; Measure the joint width of three different sizes of guide groove sealing strips before and after loading, and cut to see if there are obvious cracks in the joint.