3000 words of metalworking internship experience

The following is a 3,000-word summary of my metalworking internship experience that I compiled for you. You are welcome to read it. For more related content, please pay attention to the internship report column. 3000 words of metalworking internship experience

The one-month metalworking internship came to an end gently. Looking back on every bit of this month, it can be said that I have gained a lot and sighed a lot. Here, I experience I experienced the joy of many successes, and also made me understand that behind success is hard work. In this vast world, I found that college students have too many shortcomings and there are too many things worth learning, and no matter when, We all have to learn with an open mind.

During the month of internship, we did casting, CNC, comprehensive practice, welding, forging, heat treatment, milling and grinding, and fitter, a total of 8 types of work. For a month, there are new courses every day, and it is impossible for us to master this course quickly. However, a preliminary understanding of the application of this technology and its basic usage is of great use to us. First of all, metalworking internships include skilled workers working in factories. They have rich experience and can give us a lot of knowledge that cannot be learned in books.

Thirdly, college students have rich theoretical knowledge about machinery, but they have a blind spot in practice. With detailed teaching from teachers, safety accidents can be effectively avoided. Maybe for some students, metalworking internship is very hard, but for me, I think metalworking internship is full of fun. Even if it is a very hard benchwork internship, when I grind out a small hammer head that I feel is very good, All I felt was a heartfelt sense of accomplishment.

The internship is divided into four weeks. Monday is a theoretical class, and there is a four-day internship from Tuesday to Friday. The first week of internship is casting and CNC. The type of work in the first two days is casting. I heard from the students who have completed it, This is no easy job! To turn those shapeless sand and mud into what we want, we need to use our brains carefully. It requires not only our physical strength, but also our patience, and we must not be careless! Casting molding is a production method in which liquid metal is poured into a mold and the casting is obtained after the metal is cooled and solidified. It is divided into sand casting and special casting.

Sand casting: A casting method in which molding sand is compacted to form a mold and used to produce castings. Specialty Casting: Casting methods other than sand casting. The casting we are dealing with is round workpieces. Aluminum has a relatively low melting point and is a good raw material for casting. There are many basic modeling operations, but each modeling method mostly includes sand pounding, mold removal, molding, and box closing processes. We mainly learned two-box molding, including full mold molding and split mold molding. The general steps are as follows: (1) Before molding (2) Crushing sand (3) Spreading parting sand (4) Plugging vent holes (5) Opening external gates (6) Mold removal (7) Shaping (8) Box closing.

Boxing is the last process of molding, and it plays an important role in the quality of the sand mold. Before closing the box, you should carefully check whether the sand mold is damaged and loose sand, whether the gate is smooth, etc. When closing the boxes, attention should be paid to keeping the upper sand box horizontally lowered, and the box closing line should be aligned to prevent mispacking.

The next two days are CNC, and the operation of CNC lathe is the second type of work in our internship. It is to control the lathe for processing through programming. Through the operation and programming of CNC lathes, I deeply feel the convenience, accuracy and speed of digital control. As long as the correct program is input, the lathe will perform the corresponding operations. At the same time, you can also perform simulated processing before processing. If it is unsuccessful, you can repair the program, which reduces the waste of raw materials caused by misoperation: and, as long as you complete the program, you can use it to repeat processing, which greatly The processing efficiency is improved.

Through the teacher’s clear and focused explanations, we quickly mastered the application of CNC machine tool programming software, were able to operate common functions proficiently, learned basic grammar and commonly used programming statements, and were able to perform simple tasks. programming operations. Then we started working on the program according to the drawings. We were not familiar with it at the beginning, and there were always machining errors. After repeated research and modifications, the first program was finally completed successfully, and we watched the machining process successfully simulated on the interface. After the process, the finished product is processed, and a sense of accomplishment suddenly arises in my heart.

Although the equipment we used was specially designed for internship only, and is somewhat different from the equipment used for real production and processing, and is relatively old, we still learned the basic principles of CNC machine tool processing. , as long as the machine tool is connected to the computer through a certain interface, the machine tool can be successfully controlled through certain application software, and the machine tool's rotation speed, feed amount, feed speed, etc. are controlled through programming, making the processing automation and efficiency greater. Amplitude increased. CNC machine tools can also automatically complete some complex processing processes.

After hard work and in accordance with the teacher’s requirements, I successfully completed the task and programmed the processing program in three ways (absolute coordinates, relative coordinates, and cycle). What we do is only the most basic processing, which is very different from real production and processing, but I still feel that I have gained a lot.

In the second week, four different types of work were practiced, including comprehensive practice, welding, forging, and heat treatment.

1. Comprehensive practice includes powder metallurgy, robots, etc. Here I learned some new science and technology, broadened my horizons, and also learned a lot.

But we are not discouraged and continue to practice. The few of us cooperated tacitly, and after practicing for several rounds, our skills have improved significantly. It is indeed not easy to do electric welding because of high temperatures and sparks. This is a type of work that has certain risks. Take myself for example. During my internship, my eyes were irritated by arc light twice. In order to find the correct contact point, I always wanted to look directly with my eyes and then use goggles for protection. The master said that it would take three to five years to truly master this craft, and we had only scratched the surface.

3. Forging: Forging is a type of work that heats metal materials to a certain temperature and forges workpieces or blanks. The master blacksmith got straight to the point and said that everyone must have seen blacksmiths. In layman's terms, blacksmiths are blacksmiths. On the premise of paying attention to safety, we gradually became familiar with the work of the air hammer and continued to practice the forging process. The biggest feeling I have is that I can strike while the iron is hot and hammer down with even force. Only in this way can the craftsmanship of forging be guaranteed. The heating temperature of the forged blank must be controlled well. The master said that skilled craftsmen can judge whether it can be forged by looking at the color of the fire without using a thermometer. When a bright yellow flame appears, it is a good time to forge.

4. Heat treatment: Heat treatment is a kind of metal thermal processing that places metal materials in a certain medium for heating, insulation, and cooling, and controls its properties by changing the surface or internal metallographic structure of the material. Craftsmanship. The master mainly explained to us some basic knowledge, the process of heat treatment. The heat treatment process generally includes three processes: heating, insulation, and cooling. Sometimes there are only two processes: heating and cooling. These processes are interconnected and cannot be interrupted. Heating is one of the important processes of heat treatment.

The internship in the third week is lathe. Turning is a method of machining with a lathe. Lathes are mainly used to process various rotating surfaces, such as inner and outer cylindrical surfaces, conical surfaces, formed rotating surfaces and end faces, etc. Lathes can also process threaded surfaces. If hole processing tools (such as drills, reamers, etc.) are used, the inner circular surface can also be processed. When I walked into the lathe training workshop, I was very curious about the neatly arranged lathes. They were all equipped with operating buttons and handles. The first impression was that they were complicated. The master patiently explained to us that the first internship was manual operation of machine tools, which requires high manual operation ability.

The lathe is mainly composed of a gearbox, a spindle box, a wheel box, a feed box, a sliding crate, a tool rest, a tailstock, a bed, a lead screw, a light rod and a joystick. The lathe is operated through various handles, and the teacher explained to us the functions of each handle. It sounded a bit complicated and I couldn't fully understand it, so I had to force myself to remember it in my mind. Then the master explained the types of turning tools, commonly used tool materials, basic properties of tool materials, composition and main geometric angles of turning tools. Turning tools are the hardest and most fragile part and should be used in a reasonable and standardized manner.

The master also emphasized the precautions for lathe operations. When the lathe is running, you cannot touch the surface of the workpiece with your hands. It is strictly forbidden to wipe the rotating workpiece with cotton yarn, and you must not brake the rotating chuck with your hands. .

When using the center to clamp the workpiece, the center and the center hole should be completely consistent. Do not use a damaged or skewed center. The center and center hole should be wiped clean before use. The rear tailstock center should be firmly supported. When polishing the surface of the workpiece with emery cloth, The tool should be moved to a safe location and do not let clothes and hands come into contact with the workpiece surface. When processing the inner hole, do not use your fingers to support the emery cloth, use a wooden stick instead, and the speed should not be too fast. It is prohibited to place tools, fixtures or workpieces directly on the lathe bed and spindle gearbox. When working, you must concentrate and keep your head, hands, body and clothes away from rotating parts, such as workpieces, pulleys, belts, gears, etc.

The fourth week is the internship of milling, grinding and benchwork. The turning, milling and planing teacher gave us a detailed introduction to the relevant knowledge of milling as well as the types, principles and usage of milling machines. Milling machines are divided into two types: vertical and horizontal. The workpiece to be processed is clamped on the flat vise of the workbench, and the horizontal, longitudinal and up-and-down movement of the workpiece is controlled by the feed turntable, while the tool remains stationary, which is exactly the same as a lathe. on the contrary. The milling machine has high processing efficiency and is a common tool for metal cutting. Fitter is mainly manual operation and uses various tools to complete the processing, assembly and repair of parts.

Compared with mechanical processing, the labor intensity is high and the production efficiency is low, but it can complete the work that is inconvenient or difficult to complete by mechanical processing. At the same time, the equipment is simple, so it is still not possible in machinery manufacturing and repair work. Important job types missing. The first impression of a fitter is sawing and rubbing. I have seen adults repairing tools at home, and they are always sawing and rubbing. They often have to be busy for most of the day, and there is always no work. I was also curious when I was a child. I often played with a hacksaw and accidentally broke the saw blade while cutting something. The master is a female, but her speech and operation are very crisp and clear, and she focuses on explaining the operation process of the fitter. Commonly used equipment for fitters include fitter workbench, bench vise, grinding wheel, etc.

The work scope of the fitter includes scribing, carving, sawing, filing, scraping, grinding, drilling, reaming, reaming, countersinking, tapping, threading, assembly, and repair etc. During the sawing process, the master explained the installation of the saw blade. The saw blade should form a certain angle with the saw bow, as well as the posture of holding the saw forcefully, the position of the hands and feet, and the maintenance of the body shape. Then it was explained about filing. The purpose of filing is to make the workpiece smooth and neat. First, you must hold the file correctly. Keeping the file in a straight motion when filing on a flat surface is the key to filing. There are two types of filing force: horizontal thrust and vertical pressure. When the file is advanced, the pressure of the front hand gradually decreases and the pressure of the back hand decreases gradually. When the file is pushed to the middle position, the pressure of both hands is the same. When the file continues to be advanced, the pressure of the front hand gradually decreases and then the pressure increases.

The file returns without applying pressure. After listening to the master's explanation, the first thing we affirmed is that doing benchwork is a good way to exercise patience. Then we did it ourselves, installed the saw blade, first drew lines on the scrap iron, and then fixed it on the bench vise, and started Sawing, my work is to complete a canopy boat. After sawing out the rough shape, I was already sweating profusely. One of the saw blades was also wasted, and then I polished it hard with a file. This job was really difficult, so I repeated the same action again and again. I finally harvested my own work with my sweat, which feels quite good. Although there are still some flaws, I feel happy.

Fitter is a relatively complex, delicate job with high process requirements. Although there are various advanced processing methods at present, the tools used by fitters are simple, the processing is diverse and flexible, the operation is convenient, and the adaptability is wide. Therefore, many jobs still need to be completed by fitters. As mentioned earlier, the scope of application of fitters is work. Therefore, fitters play a special and irreplaceable role in machinery manufacturing and machinery maintenance. However, fitter operations are highly labor-intensive, have low production efficiency, and require high technical level of workers. Fitter, a test of endurance.

Internship Thoughts:

What you learn on paper is only shallow, and you know you have to do it. This is my deepest feeling during this internship. Without practice, you have no right to speak. Only by actually doing many things can you have a deep and real experience. Two weeks passed unknowingly. I practiced six types of work in one day. I gained a lot from both the knowledge operation level and the attitude towards work. I really benefited a lot from the metalworking internship. To be honest, it only took one month to practice eight types of work. It is impossible for us to fully master the essentials, but at least we understood the basic operating procedures of the type of work and practiced them personally, which laid a certain foundation for entering social work in the future.

There is no end to learning. As the masters say, any type of work we intern cannot do without three to five years of study. They have more than 20 years of working experience and are still learning. Although we have come into contact with some types of work in daily life, there is no systematic and scientific knowledge framework. After these two weeks of internship, we have a relatively full understanding of basic engineering operation specifications. In the future, I will be able to tell something in a decent manner when talking about it on certain occasions. I feel very happy because knowledge is priceless. Metalworking internship can be said to be one of the few internships in our university life, and it is also a highlight. This internship is very necessary for engineering students.

At the same time, I feel that the school can appropriately add some practical teaching tasks to the curriculum, which will greatly improve students' ability development. In this internship, we feel that we can understand the knowledge explained by the masters as soon as we hear it, but our hands and feet are always not in control and we always make mistakes when operating. This also exposes the problem that many college students today have strong learning ability but poor practical ability. We should not be afraid of making mistakes, correct them when they are wrong, argue over and over again, and have the courage to try.

We should cherish every internship during our student years and improve our abilities and qualities from the inside out. Only by learning skills well can you achieve something. If you have small achievements, it is your own. If you work hard slowly, if you achieve big things, you must have a sense of social responsibility and benefit the society. I think this can be regarded as the goal of life. Serving the people is not out of date. The metalworking internship is just the beginning. It is laying the foundation for us to enter the society in the future. I believe that as long as the foundation is solid and we are willing to endure hardships, tall buildings will rise from the ground just around the corner. We would like to express our special thanks to the teachers and masters who have worked so hard for this internship for us. This is the end of the two-week metalworking internship, and we are embarking on a new journey with the harvest, come on!