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Factory visit practice is a major practical course for engineering students in colleges and universities. It is an effective way for students to combine theoretical knowledge with production practice. Through visiting related factories, we can understand the society in practice and consolidate knowledge in practice, which not only broadens our vision and increases our knowledge, but also makes us realize that we should establish the work style of combining theory with practice, which lays a solid foundation for the future study of specialized courses and technical work. It is said that practice is the sole criterion for testing truth, and it is true. Without production practice, our theoretical knowledge can only be on paper forever. The number of courses I have learned and the number of scores I have scored in the professional courses are just empty talk. In the future, I will not be able to work smoothly.

On April 8th, the mobilization meeting for visiting and practicing was held in the classroom of Boyuan Building.Through a vivid knowledge lecture, guide the teacher to explain the occurrence of a variety of real safety accidents and the importance of abiding by the safety rules and systems, explained the production workshop in the process of safety prevention issues. Let me correct the mental attitude. Practice is not to play, but a kind of production and learning, should be treated with a serious attitude, in the process of practice always remember safety.The history of NaC began in 1947. It has won the titles of Famous brand products of China Machinery industry, National Customer Satisfaction products and Key Famous Brand products of Jiangsu Province for many times. Nanjing Automobile for many years in Jiangsu Province, Nanjing civilized unit title. On July 22, 20XX, Nanjing Auto successfully acquired the assets of MG Rover and Powertrain Company in Britain, seeking a new opportunity for Nanjing Auto to create a brilliant future. In 20XX, through the implementation of MG Automobile project, NaC will effectively improve the product series and implement the adjustment of product structure; The full range of engine products will also enhance the competitiveness of NAC in powertrain, provide strong support for the development of subsequent products, and enable NAC to step out of a development road with less investment, low cost and quick effect. On the basis of absorbing British advanced engine technology, Nanqi MG designs and produces products closer to the needs of Chinese consumers, and has a high ability to adapt to market changes. Nanqi MG fully master the electric injection calibration technology, and according to the Chinese market environment and road conditions, the engine adjustment, so that it is more suitable for domestic driving environment, more in line with the driving habits of Chinese people. Nanqi MG has a full set of cylinder block, cylinder head, crankshaft, connecting rod processing line, engine production, supporting facilities are in China, can provide users with timely parts supply and comprehensive after-sales service guarantee.

We mainly visited MG engine manufacturing workshop, we saw that MG production line is imported from abroad as a whole, the high degree of automation in the country is one of the best. During the visit, it was obviously found that the number of each production team was greatly reduced and the use of robots was significantly increased. Although it cannot be said that the robot production line is definitely superior to the manual assembly line, but the robot production in accordance with the established procedures, the accuracy is certainly much higher than the manual, the qualified rate of products naturally not at the same level. We can see the important role of automation and advanced technology in improving production efficiency, product quality and enterprise competitiveness. Later, MG docent in the form of PPT to introduce to us about the development of MG general situation and the overall process of car design, so that we personally experience the development process of car design.Nanjing Iveco Automotive Co., Ltd. transmission branch, with more than 30 years of automotive transmission professional design and manufacturing experience. The company introduced a full set of Italian IVECO transmission production technology, gear precision implementation of German DIN standard. The company has a die casting production line, transmission shell processing line, transmission shaft and gear processing flexible F-type production line and flat closed assembly line.

Transmission gear shaft processing technology: gear processing principle has two kinds of forming method and developing method. Common machining methods include gear hobbing, gear shaper, gear shaving, gear honing and grinding. This factory mainly uses gear shaper machining.

Gear shaper machining is based on the developing principle of gear processing. Various types of gear shaper in the factory. The characteristics of gear shaper machining: high precision tooth shape; The surface roughness of the tooth profile obtained is finer. It is beneficial to improve the precision of workpiece tooth profile and reduce the surface roughness. The length of workpiece common normal varies greatly.Processing technology of variable speed box. The extrusion press is used for casting. The preheated precast block is placed into the preheated mold, and liquid metal or alloy is poured under gravity. Then the liquid penetrates into the precast block under the action of the indenter, and the liquid metal solidifies under pressure.Transmission box machining production line arrangement is the first face after the hole principle, the final processing spider hole. This arrangement can first expose the porosity, sand holes, cracks and other defects of the casting blank in the processing plane.

An engine branch of Iveco Automobile Co in Nanjing, East China's Jiangsu province, April 11, 2019.

Nanjing Iveco Motor Co., LTD. Engine branch is a company engaged in the professional design and manufacture of engines. It is equipped with more than 900 sets of advanced process equipment, testing instruments and experimental equipment at home and abroad, and has built automatic production lines for cylinder block, cylinder head, crankshaft, connecting rod, camshaft, accessory box and other parts, and 4 engine assembly and test lines.

In the workshop of the company, the machining positioning clamping of each process part is hydraulic clamping, and the precision of the positioning surface is also very high. Camshaft roughing process is to use die lathe and hydraulic copying CAM milling machine, milling CAM size accuracy and shape are better than turning, directly grinding. The connecting rod blank adopts CAD/CAM mold manufacturing technology to ensure the thickness and weight tolerance of the connecting rod blank. The heat treatment method of connecting rod is forging waste heat quenching. The most common and effective method of strengthening connecting rods is shot peening. The blank is required to adopt the grinding process with higher precision. Steel mill is commonly used for machining large flat aluminum parts of cylinder block, and hard alloy indexable dense tooth milling cutter is commonly used for cast iron parts. Efficient cutting tools such as ceramic and CBN materials are used for boring cylinder holes. A large number of complex compound tools are used in the machining of holes. Engine assembly line installation operation, just into the workshop was a huge three-dimensional assembly line to shock.

Practice is the mother of knowledge. This internship is short, but we still have a lot of harvest. Through the practice base visit, learning, we have a further understanding and understanding of the study of this major, understand that their professional knowledge is still very lack, a lot of things have to be seen in the factory will be more deeply understand the mechanism. This internship is a good opportunity for us to connect theoretical knowledge with practical production. At the same time, it also inspires our interest in learning and enhances our professional pride. Lay a good foundation for the future study of professional knowledge and graduation project.What this production practice brings us is not only the operational skills we have been exposed to, but more importantly, we can feel and reflect on our own situation after the production practice, encourage ourselves frequently and gain something from it. It gives us a sense of responsibility, which makes me study more seriously and try to enrich myself. At the beginning of our internship or work, we may not know what we should do and feel a lot of pressure. In the process of work, we will pay more attention to how others do, listen to what others say, think more about what we should do, and then do more by ourselves. It is not enough to just move our mouth without moving our legs, so we should correct our attitude no matter what we do in the future, so that we can do things well. At the same time, we also see that the work is often not a person's thing, is a team to complete a project, in the process of work how to maintai communication and communication with other colleagues in the team is also quite important. We should have the ability to communicate with others and cooperate with individuals. Reasonable division of labor can make everyone do their best in the work, unite and cooperate with each other, cooperate with each other and achieve success together. If an individual wants to get a good performance, we must bear in mind a rule that we should never put personal interests above the interests of the team. In the team work, there will be situations where we can help and benefit from ourselves.Finally, thank the school for creating this internship opportunity for us, thank the leader of the teacher's hard work, thank the factory staff's patience to explain.