Method Enhancement of Quality Control in Brake Pads Manufacturing

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Werawit Phiewruangnont
Meechai Sriwiboon
Toemsak Srikhirin
Somkid Amornsamankul
Kanyaratt Supaibulwatana
Banpot Horbanluekit

Abstract

The disc brake production is coupled with a defect detection process to control quality. The current manufacturing quality is high. However, detection relies on visuals by the operator, posing challenges in terms of accuracy and time. In a high-quality production, using human labor for detection is time-consuming and labor-intensive. This research is aiming at exploring the possibility of applying object recognition using deep learning approach for the in-line defects detection on disc brake pads. Faster R-CNN, Scaled YOLOv4, and YOLOv5s were compared for the detection of two major commonly defective brake pads of brake pad model A. The main criteria for the detection are (a) the detection time must be shorter than residence time of brake pads on the detection station on the conveyor, at 498 milliseconds, and (b) the precision must be higher than 70%. The detection time and precision of YOLOv5s, Scaled YOLOv4, and Faster R-CNN are at 13.9 milliseconds and 83%, 20.0 milliseconds and 83%, and 20.2 milliseconds and 92%, respectively. The detection time of all algorithms investigated in this study is far shorter than the residence time at the checking station with the precision exceeding the criteria. The training time for Faster R-CNN, 220 minutes, is five times longer than that of YOLOv5s (49 min) and Scaled YOLOv4 (41 min). All three algorithms are capable of real-time detection and yield a consistent result on both splits and poorly consolidated friction material workpieces. Faster R-CNN is chosen because it has the highest precision.

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References

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