In the automotive industry, data management allows manufacturers to optimize processes and track the high levels of quality that are expected. Having the appropriate data on vehicles and related parts can also help to reduce costs and makes it possible to accurately and promptly respond to quality assurance and recall problems.
KIA Motors, located in Korea, manages their traceability program on their engine and transmission parts using 2-D Data Matrix direct part marked (DPM) codes. A car transmission consists of as many as 300,000 parts. Among them, the key components (e.g., differential gear, T/F driver gear, T/F driven gear, carrier, O/D clutch, transmission case, housing, valve body, etc.) are traced throughout the production process. Additionally key components on the engine, which is comprised of around 200,000 parts (e.g., the piston, cylinder head, engine block, CAM shaft, and crank shaft) are traced throughout the manufacturing and distributing processes.
In KIA Motors’ traceability program, the 2-D Data Matrix codes marked on the parts are read to determine if they are matched to the appropriate part. Then, production information such as date of manufacture and model number, is saved on the server for full traceability.
99% read rates on the 6-speed transmission production line
KIA Motors focused on enhancing 2-D Data Matrix read rates for traceability after it shifted its production system to the 6-speed transmission production line. The company’s conventional transmission production line produced approximately 1,800 units daily but only delivered 96-97% read rates. Their engine line, which produced 1,300-1,400 engines daily, had read rates that were under 97%. KIA Motors knew that an increase in read rates by as little as 2-3% in this production line would deliver various benefits, such production yield and reduction of manufacturing costs as well as improved work efficiency.
The previous barcode reader frequently stopped the manufacturing machines due to the failure to read codes. Because it was manually operated, it was hard to match the manufacturing cycle on time, which, in turn, decreased work efficiency and production yield. Furthermore, there was a possibility of using inappropriate parts if the code read was incorrect, which could cause product defects. This particular line had challenging Data Matrix codes to read since the s-speed transmission parts are small. Furthermore, KIA Motors downsized from 10x10 to 5x5, marking space. As a result, marking quality also declined.
In spite of these challenges, KIA Motors deployed Cognex barcode readers to its 6-speed transmission production line and achieved 99% read rates. Cognex readers are optimized with patented algorithms which help users achieve the highest read rates (99% or greater) on even the toughest DPM and label-based ID applications.
Patented 2-D code reading algorithm
Because KIA Motors’ auto parts are assembled with anti-rust oil spray, one of the challenges for the reader to avoid is errors caused by oil on the code. In addition, the 2-D Data Matrix codes can be stained or damaged by dirt or scratches, even though they have been washed and kept clean. And, with the reduced marking size, the codes are very small and have greater variation in marking quality, making them more difficult to read. However, these are not challenges for the Cognex barcode readers. The Cognex 2DMax+ code reading algorithm can read virtually any barcode regardless of the damage or the surface it is marked on. In addition, Cognex barcode readers offer Ethernet connectivity so they can directly integrate into the factory network, and direct communication with PLC possible without a transmission device.
KIA Motors has installed Cognex In-Sight vision systems in every transmission and engine component assembly spot. DataMan handheld readers as a backup system. The fixed-mount DataMan 100X barcode readers have also been used to check the quality of laser marks in the production line.