Unknowingly I have left school for some time, always think of former classmates, buddies, think of our time together, but now we have all gone our separate ways, I seem to be considered one of the lucky ones, came to the China Shipbuilding Heavy Industry 388 factory, do an assembly clamp, but also finally found that the original social life is so cruel, so hard, so hard, so hard. The first time I saw the movie, I was so happy to see you, and I was so happy to see you.
When the moment out of the campus, I thought I could breathe the so-called social air, but in the process of job searching, but realized that this is not easy. All around the wall, disappointment, hope, once and for all should be employed, easy to this again and again blow, I accept wholeheartedly, finally, I still touched the God, I came to the 388 factory, do a pliers, think of internships in the school, we have been in the grinding iron, came here after I thought it would be the same as before, will want us to grind iron, but after seeing the master, he told me that I will be an assembly Pliers, "assembly pliers" I have so little reaction, the master also seems to see this, he was very patient to give me what is the assembly pliers, how to do an assembly pliers, how to do a good job of an assembly pliers at the beginning of my mood is still full of doubt, do not understand is that we learn mold, how to do the cylinder assembly But now I think about it, after learning how to assemble a cylinder, I can do it. But now think about it, learn a lot of knowledge, some things can let me benefit for life. This is how valuable ah! Clamping is the oldest metal processing technology in the mechanical manufacturing. 19th century, the development and popularization of various machine tools, although most of the clamping operations gradually mechanized and automated, but in the process of mechanical manufacturing clamping is still widely used in the basic technology, the reason is that: scribing ﹑ scratching, grinding and mechanical assembly clamping operations, so far there is no appropriate mechanized equipment can be replaced; some of the most precise samples, molds, dies and dies, and the most important thing is to make sure that you have the right equipment. Precision samples, molds, gauges and with the surface (such as guide surfaces and tiles, etc.), still need to rely on the craftsmanship of the workers for precision machining; in a single piece of small batch production, repair work or lack of equipment conditions, the use of pincers to manufacture some parts is still an economical and practical method. The quality and efficiency of the clamp work is largely determined by the operator's skills and proficiency. Pliers according to the nature of the profession is divided into general pliers, scribing pliers, mold pliers, scraping pliers, assembly pliers, mechanics pliers and pipe pliers
From safety education, action and the use of tools and tools to pick up the file and other tools to the actual operation of the process, which is undoubtedly a combination of theory and practice. There are some things that you have to figure out on your own, and there are some things that you have to discover from theory to use in practice. From the beginning of the sanding plane, let me learn to do a good job is not so simple, to use the actual to confirm it. Seeing is not necessarily true (the plane looks very flat, but after photometry can find its shortcomings); this makes me think of why the school wants us to come here for internship, it is to let us know the value of learning, learning and polishing the plane as much as the spirit of meticulous in order to do so, and at the same time, also want to let us realize the importance of hands-on. Just a learning theory, that is not enough, no practical experience, can not find their hands-on ability, which requires a combination of theory and practice. More need to mind and hands with.
From plane grinding to scribing, punching; from trimming the shape to drilling; from reaming to tapping threads, every step of the way to let me learn something is not taken by others.
The party content of the clamp is for scribing, burring, filing, grinding, drilling, reaming, reaming, tapping threads and so on. Understand the construction of the file; classification, selection, filing posture, filing methods and quality testing. And what I have to do is to deal with the operation and assembly of the valve, the following is some of my work: regulating valve is often the problem of card blocking, often in the new commissioning system and overhaul of the initial period of commissioning, due to the pipeline weld slag, rust, etc., in the throttle port, the guiding parts of the medium caused by the blockage of the circulation is not smooth, or the regulating valve overhaul of the packing is too tight, resulting in increased friction, resulting in a small signal does not act on the large signal action The phenomenon of excessive signal action.
Troubleshooting: you can quickly open and close the secondary line or regulating valve, so that the dirt from the secondary line or regulating valve was flushed away by the media. Another way to use a pipe wrench to clamp the valve stem, in the case of external signal pressure, positive and negative force to rotate the valve stem, so that the spool flash over the card. If you can not increase the pressure of the gas source to increase the driving power to repeatedly move up and down several times, you can solve the problem. If still no action, it is necessary to disassemble.
There is also leakage, leakage is divided into:
1, valve leakage, valve stem length is not suitable. Gas open valve, the valve stem is too long stem up (or down) the distance is not enough, resulting in a gap between the spool and the valve seat, can not be fully contacted, resulting in the shut-off and internal leakage. The same gas shut-off valve stem is too short, resulting in a gap between the valve spool and seat, can not be fully contact, resulting in shut-off and internal leakage.
Solution: should shorten (or extend) the regulator valve stem so that the length of the regulator valve is appropriate, so that it is no longer internal leakage.
2, packing leakage. Packing into the packing box, after the gland by the axial pressure on it. Due to the plasticity of the packing, so that it produces radial force, and close contact with the valve stem, but this contact is not very uniform. Some parts of the contact is loose, some parts of the contact is tight, and even some parts of the contact is not on. Control valve in the process of use, the valve stem with the packing between the existence of relative movement, this movement is called axial movement. In the process of use, with the high temperature, high pressure and permeability of the fluid medium, the regulating valve packing box is also a leakage phenomenon occurs more parts. The main cause of packing leakage is the interface leakage, for textile packing will also appear leakage (pressure medium along the packing fibers between the tiny gap to the outside leakage). Valve stem and packing interface leakage is due to the gradual decay of packing contact pressure, packing itself aging and other reasons, then the pressure medium will be along the packing and stem contact gap between the outward leakage.
Countermeasures: In order to make the packing easy to load, chamfering at the top of the packing box, the bottom of the packing box placed in the corrosion-resistant metal protection ring with a small gap (and the filler contact surface can not be beveled), to prevent the filler by the media pressure to push out. Stuffing box ministries and filler contact part of the metal surface to be finishing, in order to improve the surface finish, reduce filler wear. Packing selection of flexible graphite, because it has a good airtightness, friction, small changes after long-term use, wear and tear of the burnout is small, easy to repair, friction does not change after the re-tightening of the gland bolts, pressure and heat resistance is good, not subject to the erosion of the internal medium, and the stem and the packing box of the internal contact with the metal does not occur pitting or corrosion. In this way, effectively protect the stem packing box seal, to ensure the reliability and long-term sealing of the packing.
3, spool, seat deformation leakage. Core, seat leakage of the main reason is due to the casting or forging defects in the production process of the control valve can lead to enhanced corrosion. And corrosive media through the fluid media scouring can also cause the control valve leakage. Corrosion mainly in the form of erosion or cavitation. When the corrosive medium through the regulating valve, it will produce the spool, valve seat material erosion and impact of the spool, valve seat into an oval or other shapes, over time, resulting in the spool, valve seat mismatch, there is a gap, off the leakage occurs.
Solution: the key to the valve spool, valve seat material selection off, quality off. Select corrosion-resistant materials, pitting, trachoma and other defective products resolutely removed. If the valve core, valve seat deformation is not too serious, can be fine sandpaper grinding, eliminate traces, improve the sealing finish, in order to improve the sealing performance. If the damage is serious, it should be replaced with a new valve.
In addition, it is oscillation, oscillation is generated by the spring stiffness of the control valve is not enough, the control valve output signal is not stable and rapid changes are easy to cause the control valve oscillation. There is also said to select the frequency of the valve and the system frequency is the same or pipeline, pedestal vibration, so that the valve with the vibration. Improper selection, control valves work in a small degree of opening there is a sharp resistance to flow, flow rate, pressure changes, when more than the valve stiffness, stability deterioration, serious oscillation.
Countermeasures: Because the causes of oscillation are manifold, so specific problems are specifically analyzed. The vibration of the slight vibration, can increase the stiffness to eliminate. Such as the choice of large stiffness spring, change the structure of the implementation of the piston. Pipeline, base vibration by increasing the support to eliminate vibration interference; select the frequency of the valve and the system frequency is the same, then replace the valve with a different structure; work in a small opening caused by the oscillation, it is improper selection of the circulation capacity of the C-value to choose a large, it must be re-selected to the circulation capacity of the C-value of the smaller or the use of split-range control or sub-mother valves to overcome the regulator valve work in a small opening.
It also has a valve positioner failure, which is divided into
1, the ordinary positioner using mechanical force balance principle of work, that is, the nozzle baffle technology, there are mainly the following types of failure:
1) because of the mechanical force balance principle of work, the movable parts are more, easy to be affected by the temperature, the vibration of the influence of the valve, resulting in the fluctuation of the valve;
2) the use of mechanical force balance principle of work, its moving parts, easy to be affected by the temperature, vibration, resulting in fluctuations;
2 ) The use of nozzle baffle technology, due to the nozzle hole is very small, easy to be blocked by dust or unclean air source, is the positioner can not work properly;
3) the use of force balance principle, the spring's elasticity coefficient in the harsh field changes, resulting in the regulator valve non-linear leading to a decline in the quality of control.
2, intelligent positioner by the microprocessor (cpu), A/D, D / A converter and other components, its working principle is very different from the ordinary positioner. Comparison of the given value and the actual value is purely electric signal, no longer force balance. Therefore, it can overcome the disadvantage of force balance of conventional positioner. However, when used for emergency stopping occasions, such as emergency shut-off valve, emergency venting valve. These valves are required to be stationary in a certain position, only when an emergency situation arises, it is necessary to act reliably. Staying in a position for a long time can easily cause the electrical converter to go out of control, resulting in a dangerous situation where a small signal is not actuated. In addition for the valve position sensing potentiometer due to work in the field, the resistance value is prone to change resulting in a small signal does not operate, the large signal is fully open dangerous situation. Therefore, in order to ensure the reliability and availability of intelligent positioners, they must be tested frequently.
By analyzing the reasons for the failure of the regulating valve, take appropriate treatment, improvement methods, will greatly improve the utilization of the regulating valve, reduce the instrumentation failure rate, the process Process The process of productivity and economic efficiency and reduce energy consumption have an important role in improving the quality of the regulatory system, so as to ensure that the production device long cycle operation.
After a period of time, I have been able to work freely, and now I am full of confidence in the future work, I believe I will do a career.
The above is my internship on this period of time the total industry, hope that the teacher to be criticized, corrected.
The workshop assembly line production internship experience (2)
This time I can have the opportunity to go to the factory internship, I feel very honored. Although only a week's time, but in this time, for some of the usual theoretical things, have a perceptual understanding, feel very beneficial.
The following is a summary of some of my internship and experience. In the future to carry out their own work, as well as in the response to customer communication, I hope to be able to draw on.
First, the overall scale of the factory level
Yatai (Dongguan) Wood is located in Dalang Town, Dongguan, covers an area of 24600 square meters, more than 600 employees. Nearly more than a decade of manufacturing history has developed into a professional scale of wood products experts, in Dongguan manufacturing industry in the developed areas are also little known.
Walking into the factory, you can only see the clean and tidy environment and orderly work procedures. Although it is a domestic manufacturer, but, to the workshop, have seen those advanced assembly lines, those skilled technical level, will completely feel the modern management. As a manufacturer of wooden products, some problems such as the flying of wood chips, the noise of the machines and the smell of glue and paint are inevitable, but the factory has minimized them as much as possible. Walking around the workshop, these serious problems faced by most wooden manufacturers don't seem to bother us too much in our factory, rather it is the management and efficiency that attracts most of the visitors.
The factory has its own work and rest time, and all of them are strictly observed. Even during the lunch break, each worker will organize their own area in an orderly manner, and this kind of self-organization is one of the reasons why the factory can keep clean. In terms of meals, the factory also has its own characteristics. That is, from top executives down to ordinary workers, eat the same meal, without any specialization.
Second, the learning process
The following points are in the factory during the internship, on my work needs, the main learning some of the knowledge and thus get some insights.
(a) the choice of wood
The most commonly used wood factory or mahogany (African rosewood), maple (U.S.), walnut. Most of them are imported from abroad, which is why our offer is higher than the price of the same domestic manufacturers - it is "a penny for a penny".
MDF board is also one of the commonly used materials. Many of our products can also use MDF veneer to achieve the effect of imitation wood. For some customers who want to save cost can recommend a use.
These conventional timber in the warehouse have a certain amount of inventory, other wood also have a reserve, but generally try to recommend the use of conventional wood (unless the customer ordered a large number of products worth the factory to purchase some other expensive wood), which will help the factory processing technology, production cycle, growth costs, etc.
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MDF veneer is also one of the commonly used materials to achieve the effect of imitation solid wood.
(ii) processing
The machines used in the factory are more advanced, generally speaking, the machine is automatically operated, such as CNC machine, universal circular saw machine, vertical axis machine. Therefore, as long as the operation is proper and the personnel arrangement is reasonable, it can generally produce high efficiency (generally speaking, skilled labor is required).
Although it is said that the factory for most of the wooden products can be produced, but later in the process of communication with customers, try to meet customer requirements at the same time, but also try to stand in the factory's position to consider. For example, you can recommend some of the same shape to the customer, but the practice is simple, clear structure of the sample. This for the factory can not only reduce costs, but also improve efficiency.
(C) paint processing
After the white body processing is completed, it should be transferred to the paint shop as soon as possible, otherwise the wood will be deformed. The process of painting is: coloring (to the product on the base color) - primer - top coat. The process of spraying primer to spray topcoat also has the process of sanding.
Primer and NC paint and PU paint. Factories often use the primer is NC paint, because the cost of PU paint is higher than NC, and if you spray PU paint, the requirements of the environment is also higher, there must be a dust-free room can be. Generally, we recommend customers to use NC paint.
Spray paint processing time is generally about two days. But although the time spent is not long, but the completion of an order, the factory will be every link will be arranged in place. Therefore, when confirming the order with the customer, we must confirm every requirement completely. Some customers in the white body is done, the paint is not determined, so set aside, not only the product is easy to deformation, but also affect the progress of the order, to the factory has brought unnecessary trouble.
Workshop assembly line production internship experience (3)
I. Purpose of internship
Production internship is an important practical teaching link between teaching and production practice. In the process of production internship, the school also aims to cultivate students' abilities and methods of observing problems, solving problems and learning from production reality. Cultivate our spirit of solidarity and cooperation, and firmly establish our group consciousness, that is, individual wisdom can only be maximized in the integration of the collective.
Through this production internship, I have learned the technical management knowledge of electrical equipment operation, the manufacturing process knowledge of electrical equipment and the practical knowledge that can not be learned in school in the production reality. In learning from the workers, we cultivated the fine style of hard work and simplicity. In the production practice, we learned that strict discipline, unified organization and coordination is the need for modern production, but also our contemporary college students must, so as to further improve our organizational concepts.
Through the production internship, it plays an important role in consolidating and deepening the theoretical knowledge we have learned, cultivating our independent working ability and strengthening the view of labor.
II. Internship tasks
1. A more comprehensive and integrated understanding of the production process and production technology; a more in-depth and detailed understanding of the production of equipment, processes, products and other related knowledge; understanding of the organization and management of the enterprise, corporate culture, product development and sales, and other aspects of the knowledge and operation process.
2. In the professional counterpart of the internship positions, and strive to learn the close combination of theoretical knowledge and practical work, and can be flexibly applied, so that their professional knowledge, professional skills and engineering practice ability have been a comprehensive enhancement.
3. Accumulate a certain amount of work experience and social experience, in terms of professional ethics, professional qualities, labor concepts, work ability and so on have obvious improvement, and gradually master the role from the student to the employee conversion, for the post-graduation employment to lay a good foundation for improving the competitiveness of employment.
III. Internship basic requirements:
1. Students in the internship enterprise must abide by the various rules and regulations of the enterprise and the corresponding labor discipline, can not take leave without reason and AWOL. If there are special circumstances that require leave of absence or change of the internship enterprise, the consent of the internship enterprise and the supervisor must be obtained.
2. During the internship, the students must strictly abide by the post operation procedures and safety management system, and prevent the occurrence of work responsibility accidents and personal safety accidents.
3. Students must abide by the law, exemplary compliance with the social morality of the citizens, and shall not engage in activities that are not permitted by laws and regulations, factory rules and school rules and regulations.
4. Work hard, actively complete the work tasks assigned by the internship unit, learn with an open mind, take the initiative, sincerely seek advice from master workers, engineers and managers, and study hard.
5. Should be more contact with the instructor to exchange, timely guidance from the teacher.
IV. Internship content
(a) safety education I. Purpose of safety education and learning: ii. The occurrence of accidents and their prevention: 1. Factors of accidents Human factors - unsafe behavior Physical factors - unsafe factors 2. Perceived factors of accidents 1). Management factors; 2). Violation of rules: a. Wrong operation b. Unauthorized operation c. Brute force 3). Poor safety responsibility (quality). III. The main safety precautions for entering the factory 1.Fire and explosion prevention 2.Dust and poison prevention 3.Prevention of burns and scalds 4.Prevention of electric shock 5.Prevention of mechanical injuries 6.Prevention of falls from height 7.Prevention of vehicular injuries 8.Prevention of injuries from lifting machinery 9.Prevention of strikes from objects 10.No alcohol consumption in the shift before the shift. IV. Equipment within the work instructions: 1. in a variety of tanks, tankers, towers and other equipment, as well as basements, wells, pits, sewers or other confined places inside the work are equipment within the work 2. equipment and the outside world connected to the pipeline, holes and so on should be effectively isolated from the outside world 3. into the equipment before the work, must be cleaned and replaced inside the equipment 4. measures should be taken to keep the air inside the equipment is good 5. Within 30 minutes before the operation, the equipment must be taken to the gas sampling analysis, sampling should be representative 6. into the equipment can not meet the cleaning and replacement requirements of the operation, must take appropriate protective measures 7. in the container work because of the lighting is good, the lighting electricity should be less than or equal to 36v explosion-proof lamps and lanterns 8. multiple types of work, multi-level cross operation should be to take between each other to avoid injury to the measures, and set up Safety ladder or safety platform, than when necessary by the guardian with a safety rope for operators to carry out construction 9. equipment operations must be supervised by a person, and should be into the rescue measures and effective means of protection 10. "equipment within the safety certificate" by the construction unit is responsible for handling the project or the person in charge of the technician to fill out the work permit, on the overhaul of the operating unit should be filled in the contents of the unit.
(B) a brief introduction to the characteristics of assembly line production: as the name suggests, the assembly line is the work of the group, each employee must seriously do their jobs, because the entire assembly line of each process is closely linked, may be due to the error of a process that causes the entire assembly line to produce products for the waste products.
(C) Study and understand the structure type, structure type and role of electronic devices.
(d) Learning and understanding of the production organization and management of the factory floor, production processes and so on.
(v) Socialism, patriotism education, love of labor, discipline education, safety education during the internship.
V. Internship process
1, safety education At the beginning of the internship, the school organized us to the company by professionals to carry out safety education for us, explaining the importance of safety issues and in the internship to encounter a variety of dangers and potential dangers and so on.
2. Workshop Internship Our workshop internship is the main way of production internship. According to the internship plan in the designated workshop internship, through observation, analysis and calculation, as well as from the workshop workers and technicians to ask for advice, the successful completion of the prescribed internship content.
3, the combination of theory and practice In order to be able to carry out more in-depth workshop internship, in the process of internship, we combined the book knowledge and internship requirements, the perfect combination of theory and practice, and more to encourage us to continue to study and research.
4, internship diary In the internship, we will be every day's work, the results of observation and research, the collection of information and charts, listened to the contents of the report are recorded in the internship diary. At any time to accept the teachers to check and correct.
V. Other activities Other activities In the completion of our internship business content at the same time, often take advantage of on-site learning opportunities to carry out to the community, to the workers and engineers internship activities. In the spare time also organized ball games, shuttlecock, table tennis and other activities, and strengthen the ideological and political education activities.
VI. Internship perception Production internship is an important practical teaching link arranged by our college to cultivate high-quality engineering talents, which is an important way to combine school teaching with production reality and to link theory and practice. Its purpose is to make us through the internship in the professional knowledge and the quality of talent in two aspects of the exercise and training, so as to become the backbone of the business as soon as possible after graduation to the workplace to lay a good foundation.
Through the production internship, so that we understand and master the workshop management, production technology and process; the use of the main tooling equipment; product production with technical information; production organization and management, etc., to deepen the working principle of electronic devices, design, testing and other basic theory of understanding. So that we understand and master the work of the factory floor and management and other aspects of knowledge. For further study of specialized courses, engaged in this area of development, design and so on to lay a good foundation.
In the process of this production internship, not only to deepen the understanding of the knowledge learned, more importantly, corrected our labor point of view and improve our ability to work independently.
In general, I am enthusiastic about this course.
First, I have been interested in this kind of small production since I was a child, and at that time I did not know how to solder, but I like to take things apart and put them together, but in this way, the thing is given to waste. Now the factory electronics internship class is to learn how to put things "back". Every time I complete a step, I am as happy as a child, and very "sense of accomplishment.
Second, the electrical and electronic internships are characterized by students' own hands, mastering certain operational skills and hands-on design, production, assembly and commissioning. It Organic combination of basic skills training, basic process knowledge and innovation enlightenment, cultivate our practical ability and innovative spirit,. As a college student in the information age, as a national key to cultivate highly skilled personnel, only know how to operate the mouse is not enough, the basic hands-on ability is the basis and necessary conditions for all work and creation.
Through a month of study, I feel I have gained in the following aspects with:
I. A preliminary systematic understanding of the theory of electronic processes. We learned the skills of testing common components and circuit components, the design and production of printed circuit board diagrams and process flow, blow dryer, flashlight, nose hair machine's working principle and the role of the constituent components. This knowledge is not only effective in the classroom, the future of electronic technology courses have great significance in guiding the learning, in daily life is of practical significance.
II. On their own hands-on ability is a great exercise. Practice makes perfect, throughout the ages, all inventions are not tested in practice. Without enough hands-on ability, there is the luxury of talking about the future of scientific research, especially experimental research achievements. In the internship, I practiced my hands-on skills and improved my problem-solving ability. For example, when doing flashlight assembly and testing, I found several short circuit pads were repaired.