1
In this internship, we first watched the company's introduction video and related ppts in the conference hall, and learned that when analyzing a company, we should consider the following four aspects: company profile, business structure, development model and corporate culture. The company is committed to monitoring the physiological health of pregnant women and the status of infants and young children. In terms of business structure, it is divided into administrative center, marketing center, quality center, etc. From the perspective of development model, we have achieved success step by step since our establishment in 1996. From the corporate culture, there are corresponding cultural committees, shuttle buses, canteens, dormitories, etc., which are all organized accordingly, and activities are held regularly.
During this period, intern teacher Lu Lei emphasized that governance is divided into legal system and human governance. Legal system is to deal with situations such as arriving late and leaving early, while human governance is influenced by corporate culture. It also shows that if a person cannot integrate into the corporate culture, it is easy to be isolated. , not taken seriously, so we need to gradually accept the corporate culture. It also tells the story of Garcia's letter. Combined with what you have learned before, the company will give you a brand new challenge. This challenge is one that you have not understood at all before, and you don't even know how to complete it. This requires execution and unreliability. The embodiment of pushback, so completing the task is the most important thing. At the end of the lecture, we were taken to the company's finished product display area, where we independently developed the use of various instruments such as pre-marital testing and baby health testing. We felt that it took a huge amount of effort for a company to achieve such achievements. I went to the R&D department, marketing department and quality inspection department again and felt the high-quality working environment and the serious work attitude. After that, I went to the production workshop. It was different from the assembly line I imagined. There were few people, only a few scattered people working on production, and many equipment were not turned on. However, I was able to see several parts of a production workshop, materials. , assembly, quality inspection, etc.
2
I was assigned to the placement team. We put on anti-static clothing and entered the sterilization room for disinfection. Then we went to the workshop where I was intern. What they did in this workshop was to tin-mount printed PCBs. Welding, they have a total of 4 assembly lines here, one of which has been shut down, one is to produce control boards, and the other two are to produce two types of LED warning lights. Since the process is the same, I will introduce it with an LED assembly line. First of all, the first process is the printing machine, which is to cover the PCB with a steel mesh and then use a milling cutter to apply tin. The important point is to find the MARK point of the PCB. This is also the reason why this machine often reports errors. It cannot find it. This MARK point needs to be manually framed next to it. My first reaction was the visual image processing of Labview. The first thing that came to mind when positioning this kind of control was the industrial application of Labview. I looked at the picture, which is a binary picture, but the edges are very rough, probably because they have not been processed. Smooth it. The machine needs to find the box. The threshold may be too high, so it often cannot find the box.
The board that comes out at this time can be seen through the connector that solder paste has been attached. The next step is to send it to the solder paste optical measuring machine. The main purpose of this machine is to determine whether the thickness of the solder paste on the solder joints is qualified through optical reflection. , whether the position is correct. This machine also often reported errors. After asking the staff there, I found out that this was the case. This machine is also a visual inspection machine. Since the thickness of tin is very strict, it will often report alarms. Another type of error is that the detection fails. Even if the solder paste reaches the solder joints or the frame reaches halfway, an error will be reported. I still think of the industrial application of Labview. Indeed, the most convenient way to process this kind of image is Labview. When I thought about the application of Labview in this scenario, I found that it is feasible. The sensitivity is very high. After thinking about the project, only vision plus movement has more practical significance.
3
On the third day, we will continue to introduce the next process. The first is the automatic placement machine, which can place 3-4 components in one second. Since the PCB version may have different numbers of components, there are a total of two automatic placement machines in one assembly line. At this time, all common chip components have been affixed to the PCB board. At this time, an employee is required to perform manual inspection on the connection table of the final placement machine to prevent the omissions of the automatic placement machine. The last step is reflow. After soldering, the high temperature generated by reflow is used to melt and then cool down the solder. The melting temperature is about 250 degrees, and the solder paste solidifies at about 210 degrees. The specific situations are also different, so the monitor there also showed us some past samples, which are all used to test temperature, including power modules, control boards, LED alarm lights, etc.
After that, the squad leader told us about some special circumstances of designing PCB boards, such as the requirements for via holes during design, how many via holes are specified for a PCB, and the distance between special components is also strictly controlled, such as The distance between the LED and the input terminal of the power supply needs to be greater than half of the layout. In other words, after the circuit is designed, the more difficult part is the PCB wiring design, so the difficulty is not what we think when designing the PCB. It's so easy and easy. When we were in school, we didn't think much about wiring and the influence between components. Therefore, we always neglected to consider the actual situation. There is actually a quality inspection process after reflow soldering, which is to use the LM photodetection machine to see if there are any errors. For example, when the temperature is high, the diode may suddenly flip over, or other empty soldering, virtual soldering, etc., so it needs to be carried out at the end. Quality inspection.
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On the fourth day, we came to the finished product exhibition hall of Greer Group. During this period, we saw the company's product results over the years, including high-speed street lamps and table lamps. What impressed me most were optical communication devices and inverters. Optical communication is a communication technology that uses light to transmit data. It uses optical fiber as the transmission medium to transmit information through the refraction and reflection of light.
Optical communications have many advantages. First, optical signals transmit very quickly because light travels much faster than electromagnetic waves. This makes optical communications very useful in scenarios that require high-speed data transmission, such as the Internet, video streaming, and cloud computing. Secondly, optical communications have higher bandwidth capabilities. Due to the broadband characteristics of optical fiber, large amounts of data can be transmitted simultaneously. This enables optical communications to meet growing data demands and support more users and applications.
In addition, optical communication also has lower signal attenuation and interference problems. Compared with traditional cable systems, optical fiber transmission has very little signal loss and is not susceptible to electromagnetic interference. This makes the optical communication system more stable and reliable.
Optical communications play an important role in modern communications. It is widely used in optical fiber communication networks, connections between wireless communication base stations, and connections within data centers. With the continuous development of technology, optical communications are constantly innovating and progressing to provide people with faster and more reliable communication services.
5
This time we visited the production workshop. First, we put on protective clothing and entered the sterilization room to remove static electricity. The person in charge also made it clear that static electricity is particularly harmful to chips, so we must go through it when entering the placement workshop on the first floor. After this process, we entered the placement workshop where I was located. I won’t go into details here. Then we came to the quality inspection area. The person in charge said that there is a power-on detection device here. This set of hardware and software is independently made by the company. After that, we went to their production workshop. The first thing we saw was the emergency power supply. In order to power the LEDs for 1-2 hours of working time at the break point, this is also the time interval required for safe first aid. , and then saw the aging detection of the power supply, which is to test the running time and efficiency of the power supply, etc. Then I went to the place where they produce table lamps. According to the person in charge, the table lamps here are only sold to the United States. They only have production rights in China and do not sell them domestically. The price of this table lamp abroad is 138 US dollars. After being introduced, I learned that this The desk lamp is not just a desk lamp, it simulates sunlight in terms of lighting and integrates multiple functions such as Bluetooth, alarm clock, and remote control. The number of features really amazes me.
After that, we entered the second floor. As soon as we entered, we saw the transformers. Various transformers, including automatic winding and manual winding, were determined according to the demand. All kinds of transformers can be produced here. Of course, I don’t know much about this part of the process, so I don’t understand much about it.