Metalworking training summary [3]

# Internship Report # Introduction Metalworking training is an important part of practical teaching in engineering colleges. Metalworking practice is an important practical link in science and engineering colleges, aiming at cultivating engineering and technical talents with innovative consciousness and ability. This article is a summary of metalworking training for everyone, for reference only.

Summary of metalworking practice I

The two-week metalworking practice ended in the echo of metal. Generally speaking, the two-week internship is an interesting and important experience, which will definitely affect my future study and work. I don't think there will be such an opportunity in the future to experience the methods commonly used in today's industry in such a short time; I'm afraid it's hard to have such luck to experience how everything around you is made.

Metalworking Practice is a highly practical technical basic course, and it is also an important compulsory course for engineering students in colleges and universities to learn the basic process methods and technologies of mechanical manufacturing and complete the basic engineering training. Not only did we gain the basic knowledge of mechanical manufacturing, understand the general operation of mechanical manufacturing, and improve the operation skills and hands-on ability, but also strengthened the exercise of integrating theory with practice, improved the engineering practice ability and cultivated the engineering quality. This is a good opportunity for us to study and exercise! I learned a lot through this short and substantial internship?

In industrial production, it is very important to put safety first! This is the first suggestion that every teacher gave us. In the theme of industrial safety, we were arranged to watch a video about practical safety in turn. The video shows in detail the internship requirements and safety treatment of welding, gas welding, heat treatment and other types of work. When we looked at such a complicated machine born from operation, we were all shocked, because there were many accidents caused by not operating the machine as required. I really don't know, I'm shocked! An unintentional action or a small negligence may lead to mechanical accidents or even personal safety accidents. Before the safety accident, many people didn't pay attention to safety education, thinking it was too complicated and boring. Once something goes wrong, it's wise after the event.

After watching the video, we listened to the teacher explain the knowledge about industrial safety in the workshop. Looking at the information handed down, I realized the importance of industrial safety. Industrial safety knowledge is necessary for senior industrial managers and developers, and it is very important for formulating enterprise safety regulations, reducing industrial pollution, fire prevention and explosion prevention. If you don't master it, you will not only be dismissed as ignorant, but sometimes serious accidents will happen. Therefore, safety is always the first. We keep it in mind and do things seriously. I am glad that I paid enough attention to it, so I spent two weeks of internship safely!

First, the purpose of internship

Understand the function and usage of each job, exercise our hands-on ability, apply the theoretical knowledge we have learned to practice, further consolidate and deepen the theoretical knowledge we have learned, improve the comprehensive application of the knowledge we have learned, shorten our thinking and distance from a college student to a staff member, and lay a solid foundation for further stepping into society in the future.

Second, the internship content

1, welding practice

I have seen the flashing electric spark in the construction site countless times, and I know it is welding. This time, we will come into contact with welding that many students are afraid of. I thought it was easy to operate, but it's not like this. It's much more difficult than I thought. Today, the teacher gave us a detailed introduction to the welding operation and some precautions. The odor and dazzling light produced by welding are harmful to human body. When operating, you should know how to protect yourself, put on work clothes and masks. From the teacher's explanation, I learned that the wrap angle of covered electrode is generally between 70 and 80, and the speed of transporting sticks is of course even. However, in actual operation, we tend to slow up and slow down, and it is difficult to maintain a uniform speed, so the welding result is not smooth. In some places, the short stay time is of course poor welding and cracks. In places where the stay time is long, there are often problems of being welded through and leaking. The height of the covering electrode is required to be kept at 2-4mm. However, at the beginning, it was also full of loopholes, because the covered electrode was shortened while transporting the bar. Therefore, it is difficult to control the initial height of covered electrode. If it is high, it is easy to arc off, and if it is low, it is easy to stick. Each student tried three covered electrode and saw the strange shape of his welding. Fortunately, after welding many times, he began to find his touch slowly and passed the final exam with good results. Through this welding, we have mastered the knowledge of spot welding, but to meet the standards of professional workers, we need to practice repeatedly, and practice makes perfect. Although welding is very tiring and dangerous, we have welded ourselves and experienced it, and we will have the opportunity to practice it again in the future.

2, heat treatment practice

Heat treatment is a kind of metal hot working technology, which heats, keeps warm and cools metal materials in a certain medium, and controls their properties by changing the metallographic structure on the surface or inside of the material.

In order to make the metal workpiece have the required mechanical properties, physical properties and chemical properties, in addition to reasonable selection of materials and various forming processes, heat treatment process is often essential. Steel is the most widely used material in machinery industry, and its microstructure is complex and can be controlled by heat treatment, so the heat treatment of steel is the main content of metal heat treatment. In addition, aluminum, copper, magnesium, titanium and their alloys can also change their mechanical, physical and chemical properties through heat treatment, thus obtaining different properties.

3, lathe work practice

Lathe workers give us a brief understanding of the working principle and mode of lathes. Learn the correct use of lathe, and correctly use a workpiece processing method; Understand the meaning of lathe model and be proficient in turning operation.

Safety knowledge of lathe workers: wear work clothes at work, girls wear work hats, and long hair is pulled into the hats. The workpiece and turning tool should be clamped firmly to avoid flying out and hurting people. It is not allowed to measure the workpiece while it is rotating. After the workpiece is installed, the three-jaw wrench must be removed conveniently, so as to avoid accidentally starting the lathe, so as to avoid the wrench flying out and hurting people.

At first, I listened to the master's arrangement and became familiar with lathe operation. Later, I practiced turning the file handle. After a while, I practiced how to thread, and finally processed the hammer handle independently. He also explained the function of each handle, preliminarily demonstrated the operation method, processed a part, and then let us start processing. The violinist has a high demand for accuracy, and a slip of the foot will be a lasting regret. If the workpiece turns too big, it can continue to turn to the appropriate size. If the car is small, the whole workpiece will be scrapped and we can only start from scratch. Unfortunately, this happened once in our group, which greatly delayed our work progress. Finally, through hard work, we finally finished our work: hammer and nut.

Turning experience: Lathe is operated by various handles, and the joy of successfully completing the workpiece by lathe can only be felt by personally participating in the internship. As college students, we have experienced more than ten years of theoretical study, and have been told more than once that there is a gap between theoretical knowledge and practice, but we have never taken this sentence seriously and have no chance to verify how big the actual gap is. Theory belongs to theory, practice is the real purpose, and real skills can be practiced. The internship at this stage gives me the feeling that I still have to come by myself. I don't know how to do it if I don't do it. I don't know why I don't do it. I don't know how to correct it after doing it. Practice makes true knowledge, and practice makes people progress faster, gain more, and better adapt to society.

4, numerical control practice

It is programmed to control the lathe for machining. The teacher also gave us a brief introduction on the blackboard and gave examples. Write step by step. What bothers us most is the alignment of the knife. A little carelessness will turn the X axis and the Z axis upside down. With the help of my classmates and teachers, I learned how to set the knife. Through the operation and programming of CNC lathe, I deeply felt the convenience, accuracy and quickness of CNC. As long as the correct program is input, the lathe will perform the corresponding operation. We learn new knowledge together and help each other solve problems we can't or don't understand. Then the teacher asked us to open a real machine tool and demonstrate those programs on the machine tool. We know that there is a big gap between simulation and reality. Simulation can make mistakes and correct them, but when it comes to real machine tools, a knife collides and wastes materials. Our calculation is also very important, and the error cannot be greater than1mm. Everyone has the opportunity to practice by himself. Pro-automation is very different from watching others do it. When I first started the machine, I felt at a loss. I don't know what to do. The first person who does this will faint. Fortunately, under the guidance of the teacher, the finished product was also made. Although it is not so perfect, I feel very happy that I made it myself.

5, fitter practice

In the training of locksmiths, we know that the main contents of locksmiths are scraping, drilling, tapping, sawing, filing, assembling and marking; Understand the structure, classification, selection, filing posture, filing method and quality inspection of archives. First of all, we must get the right gear. It is the key to keep the file moving in a straight line when filing the plane. There are two kinds of filing force: horizontal thrust and vertical pressure. When pushing the file forward, the front hand pressure gradually decreases, and then it decreases when pushing the file to the middle position, and the pressure on both hands is the same. When pushing the file forward, the front hand pressure gradually decreases and then increases. No pressure is applied when the file is returned. This will make it easier for us to file. At the same time, I also know that the locksmith's safety technology is: 1, and the bench should be placed in a place where the work is convenient and the light is suitable; Drilling rigs and grinding wheels should generally be placed on the edge of the site to ensure safety. 2, the use of machine tools, tools (such as drilling machine, grinding wheel, hand drill, etc. ), should be checked regularly, found damaged shall not be used, need to repair the rear can use. 3. When the vise clamps the tool, it is not allowed to use a hammer to beat the handle or steel pipe of the vise to exert clamping force. Then scrape, grind, drill, hinge, tap and so on. Although it is not very standard, it is the crystallization of our sweat and the result of our two-day struggle.

To tell the truth, locksmith training is boring. He may have been doing an action repeatedly all morning, but he should be strong and do it just right. That is, a file that goes back and forth on the workpiece with a file. By noon, the whole person's hands were sore and his legs were stiff. However, when he is tired, he can see the teacher personally guiding and demonstrating. He is also sweating and panting. A few days later, looking at my own processing results, I want to say thank you to the teacher who guided us.

6, casting practice

The purpose of the experiment is to understand the process, characteristics and application of casting production technology, and to be familiar with sand casting technology and the use of tools. Understand the molding sand and its composition, and master the sand casting method of simple parts. Steps of practice: in short, it is to make models, cores, molds, cores, boxes, holes, casting, cooling, sand dropping and inspection.

After listening to your classmates, this is not an easy task! It needs our brains to turn those shapeless sand and soil into what we want. This requires not only our physical strength, but also our patience. We must not be careless!

Casting can be said to be a complete aftertaste of playing with sediment when I was a child. But at this time, in addition to the impulsive heart, what is needed is more care and patience. Some people used their hands when they were young, but now they use sandboxes, hammers and autumn leaf hooks. It looks like just a few simple steps. But I don't think it is possible to make a mold that surprises everyone without repeated trimming. Fortunately, we have ready-made molds and can make the next sand mold as soon as possible. Pour sand looks simple but very tired. Don't be lazy to pour fake sand or add more sand, which will play a key role in later casting parts. Remember that sometimes a wonderful pen can blossom, but sometimes it will be wasted just because of a little tinkering! Although we were very tired all morning, we felt nothing when we saw the fruits of our efforts! It's just that we don't even believe our eyes. A pile of sand can become so neat and beautiful under our careful processing.

7. Forging practice

Forging is a processing method that makes metal materials plastically deform under the action of external force, so as to obtain blanks or parts with certain shapes and sizes. It is an important processing method in mechanical manufacturing. Forging includes forging and stamping. Forging can be divided into free forging and model forging. Free forging can be divided into manual forging and machine forging.

(1) hand forging tool

1) Support tools: such as claw anvil, ball anvil (also called mushroom anvil), core anvil, etc.

2) Strike tools: such as various sledgehammers and hand hammers.

3) Forming tools: such as various punches, flat hammers, gourds, nests, etc.

4) Clamping tools: pliers of various shapes.

5) Cutting tools: all kinds of chisels and knives.

6) Measuring tools: ruler, internal and external calipers, etc.

2. Free forging tools on the hammer

1) Clamping tools: such as round pliers, square pliers, slot pliers, holding pliers, pointed pliers, special pliers, etc.

2) Cutters: such as cutting knives (also known as chopping knives), gnawing knives, semicircular cutting knives, etc.

3) Deformable tools: such as clips, grooves, pressing irons, punches, mandrels, compression rods, bushings, etc.

4) Measuring tools: such as rulers, internal and external calipers, etc.

5) Lifting tools: such as pliers and forks.

Third, the internship experience

We spent our internship life to the fullest. Although we didn't learn much knowledge, this time we realized that there are still many skills to learn and master. Society needs talents, and society needs capable talents. In the new century, only by participating more in practice can Chinese universities ensure their position in the future social competition. We should take part in more internship activities for college students. It seems that we have more time these days than what we learn in class.

We are people who are about to enter the society. What we need more is the spirit of hard work. In the face of difficulties, we can persevere and believe that we are capable. No matter how many difficulties we will encounter in the future, we will learn to overcome them because we see the advantages and enthusiasm of learning in each other. Therefore, I hope that today's children will take more such courses, which will not only help them get physical exercise, but also help them grow into useful talents who are well-fed and not afraid of hard work when encountering setbacks.

Summary of metalworking practice II

Training place: Metalworking Basic Skills Training Room

Training purpose: to cooperate with the completion of education and teaching tasks, cultivate and improve our practical operation ability, so that students can integrate theory with practice and apply what they have learned, so that students can have a complete perceptual knowledge of mechanical manufacturing technology, understand its basic knowledge in detail and master basic skills correctly. In order to study related follow-up courses and engage in related technical work in the future, lay a certain practical foundation. At the same time, enhance the awareness of acquiring knowledge in practice and achieve the purpose of combining teaching with practice.

Security: 1. Equipment layout should be reasonable.

2. Workpieces should be placed neatly to facilitate work.

3. Organize storage tools and keep the workshop clean and tidy.

You must wear protective equipment at work.

5. Tools must be solid and reliable.

6. When using the machine, you must abide by the safety operation rules.

Basic knowledge of locksmith: 1. The fitter's work must be firmly clamped in the middle of the vice.

2. When using the saw bow, the tension of the saw blade should not be too large or too small, and the saw blade should be installed at the root of the hanging pin with the sawtooth forward.

3. When sawing, the force should be even and straight, and it is not allowed to swing up and down, and it is not allowed to be stressed or twisted to prevent the saw blade from breaking. When the sawed object is about to be sawed off, don't use too much force to prevent the sawed object from falling and hurting your toes. At the same time, the sawing speed should be slowed down to prevent the saw bow from swinging and breaking the saw blade.

4. The file selection should be appropriate. Files and scrapers without wooden handles should not be used, and the wooden handles should be firm. Don't knock or pry with a file to prevent it from breaking. Do not pile up files.

Debris should be removed with a brush, not with hands or mouth.

6. When tapping and tapping with tap and die, pay attention to correct tripping and don't skew. After the buckle is pulled up, both hands should exert force evenly, and you should reverse the car frequently for a quarter of a circle to break chips. To prevent debris from blocking and damaging the threads of the workpiece and the threading tool.

7. After the work, clean the tools, fixtures and measuring tools, and clean the vice and workbench. Common equipment of locksmiths: 1. Bench 2. Vice 3. Vernier caliper 4. Hand saw.

5. Document 6. Drill 7. Marking pin 8. Classified as level 9. steel rule

Basic operating skills of locksmiths: 1. Mark 2. Chisel hair 3. Saw things.

4. filing 5. Drilling 6. Hinge hole 7. Tapping thread

Training content: 1. Make a duckbill hammer.

2. Processing methods and steps of hexagonal nut

Training process: The two-week metalworking basic training is intense and orderly. We started this metalworking basic training in the training room under the guidance of the teacher. Before the internship, the teacher seriously told us important safety issues and precautions, which is very important for us to have a general understanding and understanding of the types of work we want to practice. In the first week of training, what we need to complete is a duckbill hammer. The teacher first gave us tools, and then gave us a piece of iron to familiarize us with tools. Step 1: Draw a line. Cut a certain length with a knife, and then saw off the excess with a saw. Step 2: Find the datum point, because we will draw a line with it. Find a slightly easier-to-find surface first, then file off the color of the surface with a big file, and then file it flat with a file. According to the file first, the elbow, handle and file must be in a straight line when filing, so that the file can be effective. Step 3: Draw a line. Because there are many lines to draw, it will be more troublesome, and it may not be clear when drawing. You can draw more lines. Step 4: Saw. Tilt slightly when sawing, and be careful not to saw the required part, which will be very troublesome. Step 5: File it flat. After sawing, the general shape comes out, and then all the surfaces are filed flat. File with a large file first, and then measure with a square ruler to see if the surface is smooth. If it is uneven, adjust it according to the specific situation, and pay attention to the size and length, and don't file too much. Step 6: After completing the modeling of the whole hammer, I drilled a hole for the hammer with a drilling machine. Because the drilling machine is old, the hole drilled is a little inclined. Even so, the duckbill hammer is well done.

In the second week of training, what we have to complete is a hexagon nut, which has the experience of making duckbill hammer before. It is relatively easy to finish hexagon nut, but it also encounters many new problems. 1. Material taking: Take similar materials according to the requirements of drawings. 2. Scribing: Draw two vertically intersecting and longest straight lines on a plane of round steel with a ruler to find the center of the circle, and then use a steel gauge. Draw a semicircle at the intersection of distance and straight line with a rigid gauge, and draw a semicircle at the other end to connect the intersection on the circle, so as to get a hexagon. 3. Select a flat end face perpendicular to the crural line for rough filing to meet the requirements of flatness and roughness, and mark it as datum plane A.4.. Based on the A surface, rough file and fine file the back surface to meet the requirements of dimensional tolerance, parallelism and surface roughness. 5. Re-check all the accuracy according to the drawing requirements, make necessary trimming and filing, and finally chamfer all sharp edges evenly. 6. Drilling: drill a round hole with radius of R 12mm in the center of the nut with a drilling machine. 7. Knock: Knock on the round hole.

After the training, we also came into contact with electric welding. In the welding training, we learned the essence of electric welding, the composition of electric welding machine and the composition of covered electrode. Learned to choose covered electrode type and how to operate welding machine. Electric welding is a very important part of our practice. Under the guidance of the teacher, we have mastered some skills through some hands-on practice. Understand the commonly used welding methods, equipment, materials, processes and application examples. 2. Understand the common welding defects and welding deformation. 3. Understand the basic principle of welding, welding technology, metal welding conditions and welding applications. 4. Understand the safety technology of electric welding. 5. Master the application scope of electric welding.

Experience: I gained a lot in this training. First of all, I have a certain sense of accomplishment when I get my own parts for the first time. Secondly, I have a preliminary understanding of some basic mechanical equipment, understand some basic operations, and can process some of the simplest workpieces. In addition, we have a preliminary understanding of some basic requirements and regulations of machinery processing plants. Finally, I have accumulated some basic work experience and practical experience, and have a certain understanding of internship, which is a guiding help to improve my practical ability and practical operation ability. After staying in class for a long time, we feel the importance of practical ability. You can't finish the actual work just by thinking and thinking with your head. Only when you have a scientific knowledge system and master the practical ability, including the continuous accumulation of mechanical operation and experience, can you apply what you have learned to practical work flexibly and effectively. China's current education system makes the practical ability of college students who have passed the college entrance examination weak. I think every training is very meaningful and practical for me. They added a wonderful stroke to my college life, which made me closer to the life of skilled workers, increased my professional knowledge and made me realize my own advantages and disadvantages.

Summary of metalworking practice 3

First, the purpose of training

Master the operation skills and processing technology of locksmith; Complete the machining task of machining hammer workpiece according to the drawing requirements; Improve students' hands-on operation ability and lay a foundation for employment.

Second, the training content

1, the characteristics of fitter processing

(1) Manual operation (2) Cold working (3) Flexible processing and convenient operation.

2, the fitter's basic operation method

Scribing: the purpose of scribing, the tools and measuring tools used, the preparation before scribing, the selection of benchmark, and the scribing method of plane and three-dimensional parts.

Sawing: the application scope and method of hand saw, the installation of saw blade, the correct posture and operation method of sawing.

Filing: scope of application, file type, selection and filing method, correct posture and operation method of filing, and inspection of parts size and shape (with steel ruler, caliper, square ruler, etc.). )

Drilling: drilling methods, composition, movement and use of drilling machines, tools and fixtures, and mastering the grinding methods of common drills.

Third, training equipment.

Materials; Vise, vise, hammer, hacksaw, file, chisel, needle, ruler, vernier caliper, vernier height ruler and universal angle ruler.

1, the characteristics of marking According to the size requirements of drawings or objects, use marking tools to draw the outline of the parts to be processed on the blank or semi-finished workpiece or the operation based on points and lines. These points and lines represent the shape, size or characteristics of a part of the workpiece, and determine the size limit of machining.

2, the characteristics of sawing The processing method of cutting or grooving materials or workpieces with a hand saw is called sawing. It has the characteristics of convenient, simple and flexible operation, does not need any auxiliary equipment and power consumption, and is widely used in temporary workplaces, cutting irregular workpieces and repairing.

3. Types and structures of hand saws A hand saw consists of a saw bow and a saw blade. Saw bow is used to install and tension the saw blade, and there are two types: fixed and adjustable. Only one length of saw blade can be installed in the fixed type, and multiple lengths of saw blade can be installed through adjustment.

4, sawing method (demonstration)

5. Workpiece clamping (1) The workpiece should be clamped on the left side of the vice for easy operation; (2) The workpiece should not extend out of the jaw for too long, and the kerf should be about 20μ m away from the side of the jaw to prevent vibration; (3) The kerf should be parallel to the side of the jaw, which is convenient for controlling the kerf not to deviate from the scribe line; (4) It is urgent and reliable, and at the same time, it is necessary to avoid the deformation of the workpiece fixture and clamp the machined surface.

6. When installing the saw blade, the saw teeth should face forward and cannot be installed backwards. The saw blade should be installed with moderate tightness. If it is too loose or too tight, the saw blade will break easily. If it is too loose, the kerf is prone to skew during sawing. Generally, two fingers are used to tighten the tightness.

7. There are two kinds of saws: far saws and near saws. In order to avoid jamming or cracking of saw blade, remote saw is generally used as far as possible. When sawing, the angle should be smaller, generally not more than 15.

8, sawing speed, pressure and reciprocating length should be appropriate. Generally, the sawing speed is about 40 times/minute, and the hard material is slower and the soft material is faster. The saw blade should be pushed back and forth in a straight line, instead of swinging left and right. Keep the saw blade working more than 2/3.

9. Sawing method of various workpieces Sawing posture and operation method: Standing posture during sawing is basically similar to chisel cutting. The left foot is half a step forward, the right foot is slightly backward, and the center of gravity is biased towards the right foot. The right foot should stand steady and straight, and the knee joint of the left foot should naturally bend slightly. The saw should be stretched by itself, with the right hand holding the handle and the left hand holding the bow. When exercising, the right hand should exert force, and the pressure on the left hand should not be too great, mainly to help the right hand straighten the saw bow. There are two postures when sawing: one is linear reciprocating motion, which is suitable for sawing thin workpieces and straight defects; The other is the swing type. This kind of operation is natural with both hands, not easy to get tired and has high cutting efficiency. When sawing, the workpiece should be clamped to the left for easy operation. The workpiece should be clamped to avoid vibration during sawing.

10, plane filing method and inspection (parallel filing, horizontal filing and push filing) File the workpiece in two intersecting directions during rough machining. This cross file method can judge the height of the file surface, thus leveling the high position. In finishing, the workpiece is filed flat along the length direction with a file, and a straight file mark can be obtained after filing.

More neat and beautiful; To correct the plane or size, push files can be used to improve the accuracy or reduce the surface roughness. When filing a plane, always check whether the filing surface of the workpiece is smooth. Generally, steel tape measure or square ruler is used to check by light transmission method. Put the ruler close to the working face, and check it in many places along the longitudinal, transverse and oblique directions. When checking the angle, you can use a square ruler, protractor or sample ruler to aim at the angle and check it by light transmission method.

Fourth, training steps;

1, marking: based on two mutually perpendicular planes, it is accurate and clear, and there can be no repeated line segments;

2. Sawing: Pay attention to the machining allowance;

3. Filing: fine grinding after rough filing

4. Drilling: pulling out the hole of the sample;

5, tapping, head cone: two cones, the concept of verticality.

V. Matters needing attention in training

1, the clamping table should be placed in a place convenient for work and suitable for light;

2. When the vise clamps the tool, it is forbidden to use a hammer to beat the vise handle or steel pipe to exert clamping force.

3. Blanks and machined parts should be placed in the specified positions, neatly arranged and placed stably, so as to ensure safety, facilitate taking and placing, and avoid touching the machined surface.

4, machining allowance should be moderate, leaving too much will cause a burden for further processing;

5. Pay attention to the standing posture when processing the workpiece, otherwise working for a long time is not good for your health;

Sixth, training summary;

Bench-fitter practice is a compulsory technical basic course for engineering students. In the process of fitter's internship, students organically combine basic process knowledge, basic process methods and basic process practice related to mechanical manufacturing, cultivate comprehensive ability of engineering practice, and cultivate and exercise ideological and moral quality. Fitter practice is an effective way to cultivate students' practical ability. It is also a very important and meaningful compulsory course for our engineering students. The fitter's internship is another opportunity for us to actually master knowledge. The main task of our locksmith internship is to be a locksmith.

Through the teacher's explanation, demonstration and personal practice, I finally understand what a locksmith is and why some people say, "Being a locksmith is the most tiring!" " "The fitter mainly relies on manual operation and uses various tools to complete the processing, assembly and repair of parts. Compared with machining, it has high labor intensity and low production efficiency, but it can complete the work that machining is inconvenient or difficult to complete, and the equipment is simple, so it is still an indispensable and important type of work in mechanical manufacturing and repair.

Although the training is very tiring, I am exposed to the basic tools and skills that I need to master as a locksmith, which will be valuable experience for my future work. At the same time, I deeply realized the hard work as a locksmith, and these experiences are valuable wealth in my life.