Taicang Sensitive Vice President Lu Zongxian: Problems and Myths of Fastener Optical Screening Machines 1. The era of contending In recent years, the manufacturers of optical screening machines in China have sprung up. There are many Taiwan-funded manufacturers, American-owned manufacturers, and some manufacturers in Singapore. There are more domestic factories, and they have recently appeared from the old factory. With a program out, without any computer programming ability, you can start to do the manufacturer. I have been in the automation design for 20 years, and the optical screening machine has been designed for ten years. I have seen many problems and lost. share it. 2. Principle of optical photography The principle of optical photography is actually what everyone thinks: take a photo of the fastener and pass it to the computer for judgment. However, the learning is to "take photos", the techniques for taking photos are divided into two types, the first one is projection, as shown in Figure (1). figure 1 The principle is the same as that of the projector. This is a method that must be used when dimensional accuracy is required. The problem is that the dimensional accuracy needs to be more accurate. This is determined by four factors: CCD pixel, light, lens, and part size. The second principle is reflective (Figure 2). figure 2 3. The problem of precision The above-described projection type imaging (see Fig. 3 below). image 3 How much precision can be achieved in the end, many people think that as long as the CCD (camera) pixel height can improve the accuracy, in fact, it is only 1/3. Lens and lighting are the other 2/3 factors, and CCD pixels can't be improved without the upper limit, because the higher the pixel, the slower the computer discriminates. If the reader does not choose, then I will provide you with a method for you. For those who directly contact the optical screening machine, please use (1) 1.2 million pixel CCD, (2) plus telecentric lens, (3) with telecentric lighting (screened parts maximum) The height is 25mm and the width is 25mm. I think if you ask these requirements, you should scare many manufacturers. They will definitely say that those parts are imported. It is very expensive. In fact, the author tells you that it is "okay"! It is only decided to obtain the above parts. The source, as well as the rate of self-control. With the above combination, your equipment can achieve an accuracy of ±0.01mm (static, taking pictures when the part is stopped) and ±0.02mm (dynamic, taking pictures when the part moves). Let's talk about reflective imaging (see Figure 4 below). (Figure 4) If the tolerance is enlarged to ±0.3mm, I don't necessarily dare to do it. The author tells you these ideas, I hope everyone can understand, don't be fooled by some salesmen who have sold the screening machine and sold almost crazy! 4. Speed ​​problem Recently, as long as some manufacturers say that their machines can detect 450pcs in one minute, it will not be long before another one has a total of 600pcs. It is not long before 1000pcs comes out again. This is actually a crazy move. The machine is not the number of vibration discs that can be sent out. It means the production capacity of the machine. It is what the inspection is. The number of cameras determines the production capacity. Generally speaking, the welding screws are taken as an example (M8×30mm). , head width, tooth diameter, tooth pitch, oblique tooth, solder joint area, head crack, the time to determine a should be within 100ms (see the skill of the manufacturer to write the program), the reasonable capacity should be 400pcs / min, What's more important to note is that if the computer judgment time is too short, for example, when the two screws are too close, the machine has other measures to ensure that it will not fall into the good area. The details to be noted by the screening machine. 5. The computer program is compatible with various fasteners. We all know that the types of fasteners are very numerous. It is impossible to design a screening machine that can be inspected. However, it is feasible to design a software that can be inspected. Generally, optical screening machines are required. It is important that you provide the fasteners to be inspected because of the vibrating plate and the test machine and acceptance criteria, but most people will not notice whether the software you bought is an "open system" or a "closed system". I believe that everyone buys a closed system. The so-called closed system is designed for the fasteners you provide this time. If the machine is used for a period of time to filter other fasteners, its appearance and inspection place. It’s very different from the previous one, when you hear “I’m sorry, the software doesn’t have this feature, I have to redesign it, pay for itâ€, or “Buy one more!†So ​​if the vendor develops an open system, It is quite beneficial to consumers. The so-called open system means that all the detection functions are put into the software, so that the operators can apply them themselves. However, it takes time to develop such a program. The longer you do, the more the detection function will be, so it is important to choose the software carefully. 6. Program lock problem All manufacturers who do screening machines will certainly protect their software to prevent it from being stolen. If it is good, it will protect itself. If it is not good, it will cause trouble to consumers. I once had a thing in Korea, a customer. I bought a screening machine from the manufacturer of the domestic manufacturing machine. After a period of time, the computer hard disk was broken. The software of the hard disk computer could not be executed. The original manufacturer locked the serial number of the CPU and the serial number of the hard disk. I can't communicate well with the password. After the password is entered multiple times, the lock is more dead, leading to trade disputes between the two parties. 7. After-sales service issues Many foreign-funded factories that manufacture screening machines can only sell one in the Chinese market when they send a salesperson. They will be thrown to the original factory after receiving the order, and then imported into China. No machine will fail, and after the failure, sales in China. The personnel can't solve the problem at all. It is necessary to send engineers from the original factory to solve the problem. The cost must be very high. Who pays the fee? The dispute came out. 8. Conclusion The author has talked about a lot of technical and conceptual problems here. I hope that everyone can be happy and buy a suitable optical screening machine. The special feature author is Lu Zongxian, deputy general manager of Minar Automation Technology Co., Ltd. Introduction of Taicang Sensitive Automation Technology Co., Ltd.: The company was founded in 1992 and is engaged in the development of automated assembly lines. In 1998, the company successfully introduced the combination of measurement system and assembly machine, allowing customers to complete 100% inspection of finished and semi-finished parts in automatic assembly. Since 2000, the company has been committed to the integration of automated machinery and computers, as well as the development of CCD imaging systems. In 2001, the company successfully implemented the technology of CCD image discrimination and measurement information computerization. In 2008, the company developed a linear screw optical screening machine with excellent performance and high-speed screening speed to meet the needs of fastener manufacturers. (Golden Spider "Fasteners" quarterly editorial department) Portable spectrophotometer,45/0 spectrophotometer,Hardware spectrophotometer CHNSpec Technology (Zhejiang)Co.,Ltd , http://www.chnspec2013.com
This reflective principle is more like a human eye. It is projected onto the fastener by light and reflected back onto the CCD. This method is not suitable for accurate dimensional measurement, but is suitable for the detection of flaws, such as nuts. The sputum of the inner teeth. 
As shown above, this is a reflective image, usually in the inspection of cracks or imprints, but many people will ask why the hexagon is so clear, why I said that can not be checked, other manufacturers say can check, I saw The diagonal tolerance of the hexagonal side is ±0.15mm. Do you not know that the reflection measurement is very different from the color and chamfer size of the part?
Taicang Sensitive Automation Technology Co., Ltd. was formally established in June 2007. Based on Taiwan's keen work experience and arduous work attitude for nearly 20 years, and the full-time engineers with advanced technology, I believe that it will provide more refined and economical. Various assembly and inspection equipment, shorten the distance between new and old customers, improve the quality of services, and improve the effectiveness of services.