Chery Automobile Co., Ltd. (hereafter referred to as Chery Automobile Co., Ltd.) is a well-known self-owned brand automobile and component manufacturer in China. Its core component of automobile, independent engine research and development, design and processing, is the pride of Chery Automobile.
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In the connecting rod processing production line of Chery Automobile Engine, the engine connecting rod adopts two-dimensional code for grade and production information recording, and the equipment is automatically classified by A and B grades and unqualified parts. The connecting rod level measuring process consists of a fully automatic and efficient combined device. The connecting rod machining consists of four major parts in this process:
1) Process machine body adopts SIEMENS CPU317 system, its main function and function is to control the fixture action and robot of the machine tool, and send out signals to start external equipment and accept the information sent by the external equipment;
2) The size measurement system adopts the measurement system of Marposs, Italy, and Marposs sends the measurement data to the marking equipment;
3) Marking equipment is provided by Jinan Yiheng Technology Co., Ltd. The marking equipment accepts the measurement data sent by Marposs and the part identification information issued by the CPU317 system, and then performs two-dimensional code marking and selective clear marking. After marking Sending an end signal to the CPU317 system;
4) The CPU317 system processes the feedback information obtained and controls the robot to divide the workpiece into the A zone, the B zone, and the scrap zone.
However, since the overall measuring device is a single linear control, only a single measurement work can be performed. There is no feedback after the problem occurs, and it is impossible to detect each other, and there is no closed-loop control for measuring and detecting important workpieces. In addition, the two-dimensional code is difficult to visually see defects in its quality, which can lead to defective parts entering the assembly line workshop from the manufacturing floor.
Therefore, the measurement system needs to add an advanced code reader to detect and judge the integrity and correctness of the two-dimensional code of the link. However, the use of the code reader also needs to overcome a series of challenges, such as the narrow space of the device, the strong reflective surface of the two-dimensional code printing surface, and the high reading efficiency to adapt to the running time of the device.
Chery Automobile needs to find a highly skilled supplier to help them solve the above problems. Based on the influence and good reputation of Cognex brand in the industry, Chery Automobile found its agent, Shanghai Betway Company, after the in-depth communication and exchange between the two parties, Chery Automobile engineers on Cognex products The characteristics have a deep understanding.
Chery Automobile first made a tentative debugging comparison of Cognex's DataMan 302 code reader (hereinafter referred to as DM302). “From the design point of view, this product is small in size and easy to install. The first impression is very good.†Chery Automobile’s engineer said, “Next, we found a batch of products with QR codes and read them with DM302. Comparing the reading results with other brands of readers, the results show that the DM302 has a very high read yield."
With this successful commissioning result, Chery Automobile officially installed the DM302 on the device. Chery Automobile engineers found that the DM302 has its own internal light source, which solves the problem of external light changes interfering with the reader. In addition, the DM302 is very easy to install, and the setup of the device debugging software is also a few simple steps. It is very easy to get started. “Compared to the complicated debugging software, we are more likely to accept simple products as field maintenance personnel.â€
At present, Chery Automobile's product information storage and follow-up uses DataMatrix code. The biggest feature of DataMatrix code is its high density. It is the smallest code among all bar codes. It can encode 30 numbers in an area of ​​only 25mm. DataMatrix code is also the best choice for component identification. Therefore, the production site needs efficient and stable reading device, and can carry out the work of differential identification matching of components and feature detection of important components, and the DM302 will undoubtedly be able to show its talents in these aspects.
“The biggest factor for Chery Automobile to choose DM302 is that it has a high reading rate and can fully meet the high-speed production tempo on the spot.†Chery Automobile's engineers said, “In addition, DM302 is very suitable for small space and high efficiency requirements. Occasionally, we don't have to think about installing problems."
“In order to achieve closed-loop control of the processing quality of the equipment, the data read by the reader needs to be sent and processed. This problem is easily realized after adopting the DM302 product,†Chery Automobile engineers finally pointed out, “DM302 is in me. The company's application fully meets the quality requirements of the closed-loop control of the production process."
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