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Twelve weekly mechanical internship internship diaries and a summary: (CNC programming related to computer information technology)

The weather on Monday, April 23: cloudy in the underworld

< p>When I first arrived, I was not used to working continuously. After staying up late several times, I gradually began to show signs of madness. The specific symptoms were that I started to mistake the men's and women's bathrooms after 2 o'clock, and stuffed late-night snacks into my nostrils. I was very depressed at the time and felt that I was working too hard. What really calmed me down was another intern’s thoughtful words. He came a month before me. "You are so lucky," he said enviously to me in a daze late one busy night. "When you came, the busy season was over."

The weather on Monday, April 30: cloudy in the underworld

Hongchao has always been considered one of the top five precision companies in Shajing Houting Industrial Zone One of the most radical styles among plastic mold factories. Hongchao strives to complete the most arduous tasks with the most limited manpower and push everyone to the limit of what they can bear, in order to strive for high efficiency and high profits. I felt this very deeply during my internship. Everyone is busy and under great pressure, and no one has time to teach you anything. When they assign tasks to you, they have already presupposed: You come to work at Hongchao and you are an employee of Hongchao, so you should inherently understand all the practices and rules of Anhongchao's business. Interns are no exception. You can only rely on yourself to see, guess, and shamelessly ask for advice.

Monday, May 7 Weather: Sunny

Time always passes by inadvertently, and it has been two months since the internship started.

I feel like I have done a lot, but there is still a lot that I haven’t done yet.

Although drawing CAD design drawings is very boring, and the tracing has to be done one by one, which is quite troublesome, but practice is always necessary, and you can always learn a lot, haha! I am starting to become more proficient in drawing, and I hope to be able to do practical tasks soon.

The weather on Monday, May 14th: sunny

I started to practice hand-drawing in a targeted way. I started with line drawing exercises. I drew a small European-style house. I always felt that I had a good grasp of the details. The control ability is not enough, overall OK, look carefully at the garbage! ! ! It still needs to be strengthened. . . Moreover, I also started practicing with markers this week. I prepared some simple scene pictures. It seems that the pens are not enough, so I have to make do.

I learned a set of advanced AutoCAD engineer drawing skills from the Internet, and it turned out to be a treasure, not bad. . . There seems to be a lot that I don’t understand, so I have to think about it slowly and carefully.

I always feel that my time is not utilized sufficiently, especially at night, when I don’t know what to do. I hope this situation can change as soon as possible. I haven’t learned much about 3D, PS, or SK. I’m busy tracing, but I still have to rely on myself to learn this, so I should set stricter requirements on myself.

Monday, May 21st Weather: Sunny

There are so many things going on these two days, it seems that there is no chance to breathe. After one thing is done, I will do another. I started to feel like I wasn’t getting enough sleep, eh! Looks like you need to take good care of yourself.

Today is the last batch of customer elite pictures. Yesterday, I was busy until 2 o'clock in the night before going to bed. I thought that Sister Mo and the others could leave before 12 o'clock. I didn't expect that her task would be so heavy. She had to do 2 It wasn't done yet, so I finally helped her do what I could. I couldn't bear it anymore so I went to bed. I agreed to wake me up before leaving. When I woke up four hours later, I found that she was still busy. Alas, it was time. Urgency and Party A's pressure, only now do I realize what the exhaustion of rushing to do is, and then think about the senseless rushing to do things in school, it's really ridiculous.

After completing Elite’s project, although I didn’t do much, I feel that I have improved a lot and finally gained confidence in my CAD construction drawing technology.

The weather on Monday, May 28: Sunny

To be honest, I have done this before when I was in school, but the effect was not so good, because when I encountered difficulties or If you don’t understand something, you just stop doing it. But now that I have a master by my side, I can just ask if I don’t understand something. This has benefited me a lot. If you use a few tricks during the drawing process, you can indeed achieve twice the result with half the effort. After a few days of basic training, the master finally allowed me to participate in their planning. I was a little nervous at first, but then I gradually became familiar with the entire process of planning and post-production.

Slowly, the teacher also gave me some more important tasks. This gave me a deeper understanding of this industry. Through this internship, I feel that I have gained a lot in CAD design.

Monday, June 1st Weather: Sunny

On Children’s Day, keep your childlike innocence for yourself! I wish those of us who are beautiful on the surface but wandering on the inside; whose appearance is not old, but our hearts have gone through vicissitudes; who seem to be talented, but in fact are gangsters; whose achievements are hard to come by, but who are often depressed; who are more tired than mules, busier than ants, who wake up earlier than chickens, and who sleep better than dogs. late; works more than donkeys, eats worse than pigs; is more loyal than Yue Fei, and more nervous than Lai Changxing. Happy Children's Day!

Weather on Monday, June 4th: Sunny

Now I feel that this job is quite good. The most important thing is that the colleagues around me are very good. There is no extra or unnecessary pressure in my heart, I can work and study well. Get a job first, choose a career later. I need to train myself now. If you study hard, I believe that through hard work you will find a good job to repay your parents and all their teachers. There is nothing extravagant to ask for. Of course, training yourself is the first priority now, not to mention that the current salary is not bad. In this more than a month, I learned some things that I couldn't learn in school. Even if I understand things, sometimes I can't do them well at the beginning. When doing things now, you must not only have an attitude of asking for advice, but also know how to learn from each other's strengths and make up for your weaknesses. The most important thing is "tolerance", which means perseverance. Now, although I have been working for a short time, I find that I have really changed a bit, and I am better at dealing with people than before.

The weather on Monday, June 18th: Sunny

Today is June 18th. I look at my few diaries, which record my mood in the past three months. It’s hard to accept that my internship is over in just a few days. It was rare that I didn't work overtime in the evening, so I went to the skating rink with a few colleagues and went crazy. Under the strange lights, I suddenly realized that my state of mind was like a shirt being swept around. Many people passed by in a hurry, but I didn't know it. Who do you belong to and where will you be in the future? Chatting with Master Li, who has been taking care of me, he suggested that I find a more relaxed job, saying that girls still have to have their own lives, and the sense of career achievement is not that important to girls. Thinking about his words, I suddenly felt a little scared about tomorrow.

Saturday, June 23 Weather: Cloudy

The last day of the weekend!

There is always a banquet in the world! The internship is about to end and I will go back to school on the weekend. There are a lot of things to sort out and hand over... It seems that there are still many things that have not been finished. There are too many unforgettable things and too many unforgettable people here. People are not grass and trees. Who can be ruthless? After a few months of getting along - Really reluctant to leave! There were thousands of words in my heart but I didn’t know where to start. I could only bid farewell to Hongchao silently in my heart. Goodbye Hongchao! Goodbye, colleagues who once had the pleasure of enduring hardship together! However, I will definitely come back! Wait for me!

Monday, June 24 Weather: Sunny

Summary: During the three internships, I learned a lot of new things, which are not accessible in school. As the saying goes, society is a melting pot for training people. Only through the melting of this melting pot can people's true social value be reflected, and this entire process can be completely controlled by yourself. This not only requires us to adhere to our own philosophy of life and maintain a correct outlook on life and value orientation, but also requires us to have an open-minded and enterprising heart. Only in this way can we take control of our lives and be a successful person and a useful person to society. I believe that I will always maintain such a pure heart, study hard and never stop, use my infinite youthful vitality to realize my own life value, and create a sky of my own.

Internship report:

1. The development history of CNC systems in my country

1. Starting from 1958, a group of scientific research institutes, universities and a few machine tool factories started to develop CNC systems in our country. research and development. Due to the constraints of the low level of domestically produced electronic components and sectoral economy at that time, it was unable to achieve greater development.

2. After the reform and opening up, my country's CNC technology gradually achieved substantial development.

After the introduction of foreign technology during the "Sixth Five-Year Plan" (81--85), the digestion and absorption of the "Seventh Five-Year Plan" (86------90) and the "Eighth Five-Year Plan" (91-1-95) The scientific and technological research organized by the state has made my country's CNC technology make a qualitative leap. The products that passed the national research acceptance and appraisal at that time included Beijing Everest Company's China I type, Huazhong CNC Company's Huazhong I type and Shenyang High-end CNC National Project The Blue Sky I type of the research center, as well as other domestic CNC systems that have passed the test of the "National Machine Tool Quality Supervision and Testing Center" such as the products of Nanjing Sikai Company.

3. my country's CNC machine tool manufacturing industry experienced a period of rapid development in the 1980s, and many machine tool factories transformed from traditional products to CNC products. But in general, the technical level was not high and the quality was poor. Therefore, in the early 1990s, the national economy faced the transition from a planned economy to a market economy and went through the most difficult period of depression for several years. At that time, the production capacity dropped to 50 %, inventory is more than 4 months. Since the "Ninth Five-Year Plan" in 1995, the country has launched the machine tool market by expanding domestic demand, strengthened restrictions on the approval of imported CNC equipment, and invested heavily in supporting key CNC systems, equipment, and technology research, which has played a great role in promoting the production of CNC equipment. , especially after 1999, the state invested a large amount of technical transformation funds in the national defense industry and key civilian industrial sectors, making the CNC equipment manufacturing market prosperous.

3. CNC lathe technology and tool cutting

Reading: 133

The CNC lathe processing technology is similar to that of ordinary lathes, but due to the It is a one-time clamping and continuous automatic processing to complete all turning processes, so the following aspects should be paid attention to.

1. Reasonable selection of cutting amount

For efficient metal cutting, the material to be processed, cutting tools, and cutting conditions are the three major elements. These determine processing time, tool life and processing quality. Economical and effective processing methods must be based on reasonable selection of cutting conditions.

The three elements of cutting conditions: cutting speed, feed rate and depth of cut directly cause damage to the tool. As the cutting speed increases, the tool tip temperature will increase, causing mechanical, chemical, and thermal wear. If the cutting speed is increased by 20%, the tool life will be reduced by 1/2.

The relationship between feed conditions and tool back wear occurs within a very small range. However, the feed rate is large, the cutting temperature rises, and the wear behind is large. It has less impact on the tool than cutting speed. Although the impact of depth of cut on the tool is not as great as that of cutting speed and feed, when cutting with a small depth of cut, the material being cut will produce a hardened layer, which will also affect the life of the tool.

Users should choose the cutting speed based on the material being processed, hardness, cutting status, material type, feed amount, depth of cut, etc.

The most suitable processing conditions are selected based on these factors. Regular and stable wear to achieve life is the ideal condition.

However, in actual operations, the choice of tool life is related to tool wear, changes in machined dimensions, surface quality, cutting noise, processing heat, etc. When determining the processing conditions, it is necessary to conduct research based on the actual situation. For difficult-to-machine materials such as stainless steel and heat-resistant alloys, you can use coolant or choose a rigid blade.

2. Reasonable selection of cutting tools

1) When rough turning, choose tools with high strength and good durability to meet the large back cutting capacity and large feed during rough turning. Quantity requirements.

2) When finishing turning, you must choose tools with high precision and good durability to ensure the processing accuracy requirements.

3) In order to reduce tool changing time and facilitate tool setting, machine-clamped knives and machine-clamped blades should be used as much as possible.

3. Reasonably select fixtures

1) Try to use universal fixtures to clamp workpieces and avoid using special fixtures;

2) The positioning datum of parts should overlap to reduce Positioning error.

4. Determine the processing route

The processing route is the movement trajectory and direction of the tool relative to the part during the processing of the index-controlled machine tool.

1) The processing accuracy and surface roughness requirements should be guaranteed;

2) The processing route should be shortened as much as possible and the tool idle time should be reduced.

5. The relationship between processing routes and machining allowances

At present, when CNC lathes have not yet reached widespread use, excessive allowances on the blank should generally be removed, especially It contains the remainder of the forged and cast hard layer and is processed on an ordinary lathe. If it is necessary to use a CNC lathe for processing, you need to pay attention to the flexible arrangement of the program.

6. Key points for clamp installation

At present, the connection between the hydraulic chuck and the hydraulic clamping cylinder is achieved by a tie rod, as shown in Figure 1. The key points for clamping the hydraulic chuck are as follows: First, use a wrench to remove the nut on the hydraulic cylinder, remove the pull tube, and pull it out from the rear end of the spindle. Then use a wrench to remove the chuck fixing screws to remove the chuck.

Four. Carry out effective and reasonable turning processing

Reading: 102

Effectively save processing time

Index company’s G200 turning center integration The processing unit has modular, high-power dual-spindle and four-axis linkage functions, which further shortens the processing time. Contrary to other clamping concepts with the help of a work axis, this product uses an integrated intelligent machining unit to automatically clamp the workpiece into place and process it. In other words, automatic clamping will not affect the processing of the other spindle. This feature can shorten the processing time by about 10%.

In addition, four-axis machining is very fast and can be processed with two tools at the same time. When machine tools are put into use in pairs, the efficiency improvement is more obvious. In other words, two machines can be set up in parallel for conventional turning and hard turning.

The only difference between conventional turning and hard turning lies in the tool holder and centralized constant temperature coolant system. But the difference from conventional machining is that conventional machining can be processed with two tool holders and one tailstock; while only one tool holder can be used during hard turning. Dry hard machining can be performed on both types of machine tools, but the manufacturer of the process solution needs to carefully design a balanced cycle time, and the modular structure provided by Index machine tools gives it greater flexibility.

Improving productivity with high precision

With the continuous improvement of production efficiency, users have also put forward high requirements for precision. When using the G200 turning center for processing, up to 4 workpieces need to be processed after cold start to achieve a tolerance of ±6mm. During processing, the accuracy is usually maintained at 2mm. Therefore, Index provides customers with a complete solution with high precision and efficiency. To provide such a high-precision solution requires careful selection of functional components such as spindles and bearings.

The G200 turning center has achieved good results in its application at the BMW Landshut Automobile Manufacturing Plant in Germany. The plant not only produces engines, but also parts cast from light metals, plastic interior trim and steering shafts. Quality supervisors believe that the machining accuracy is very precise: the continuous tolerance zone is ±15mm, and the bearing housing tolerance is ±6.5mm.

In addition, Index's fully automatic intelligent processing unit was used to process the universal joints. The first two turning centers are used to pre-process workpieces before marking them. After processing, they are measured online and then sent out via conveyor belts for gear hobbing, cleaning and quenching. In the final process, a second Index processing system is used. Two G200 turning centers perform hard turning on the bearing seat of the steering knuckle. The online measurement is completed in the machine and then sent to the unloading unit. The integrated machining cell is fully integrated into the workshop layout, is ergonomically friendly, requires a significantly reduced floor space, and requires only two employees to look after the manufacturing cell.

Fifth, the wonderful use of G00 in CNC turning processing and techniques to ensure dimensional accuracy

CNC turning processing technology has been widely used in the machinery manufacturing industry. How to complete it efficiently, reasonably, and according to quality and quantity? Every engineering and technical personnel engaged in this industry has more or less their own experience in the processing of workpieces. The author has been engaged in CNC teaching, training and processing for many years and has accumulated certain experience and skills. Now, taking the GSK980T series machine tools produced by Guangzhou CNC Equipment Factory as an example, I will introduce several examples of CNC turning processing techniques.

1. Techniques for using G00 in the first sentence of a program

In the textbooks and technical books on CNC turning that we are currently exposed to, the first sentence of the program is to establish the workpiece coordinate system, that is, with G50 Xα Zβ is used as the first sentence of the program.

According to this command, a coordinate system can be set so that the coordinate value of a certain point of the tool in this coordinate system is (Xα Zβ) (the origin of the workpiece coordinate system in this article is set at the right end surface of the workpiece). Using this method to write a program, after setting the tool, the tool must be moved to the predetermined position set by G50 before processing can be performed. The process of finding the position is as follows.

1. After setting the tool, clamp the workpiece blank;

2. Rotate the spindle forward, and the handwheel reference knife is flat on the right end surface A of the workpiece;

3 . The Z axis does not move, release the tool along the ;

5. The X-axis does not move, release the tool along the Z-axis to point C, stop and measure the diameter γ of the turned workpiece step, enter G50 6. In the program entry mode, input G00

Among the above steps, step 6, that is, positioning the tool at XαZβ, is crucial. Otherwise, the workpiece coordinate system will be modified and the workpiece cannot be processed normally. Anyone with machining experience knows that the above-mentioned process of positioning the tool to XαZβ is cumbersome. Once an accident occurs, there is no servo in the X or Z axis, tracking errors, power outages, etc., the system can only be restarted. After the restart, the system loses control. The memory of the workpiece coordinate value set by G50 and "reset and zero return operation" no longer work. You need to run the tool to the XαZβ position again and reset G50. If it is mass production, after processing one piece, return to the starting point of G50 to continue processing the next piece. If there is a slight mistake during the operation, the workpiece coordinate system may be modified. In view of the various disadvantages of using G50 to establish the workpiece coordinate system in the first sentence of the above program, the author found a way to fix the workpiece coordinate system on the machine tool. After changing the first sentence of the program G50 XαZβ to G00 Xα Zβ, the problem was solved. The operation process only needs to adopt the first five steps of the above-mentioned G50 finding process, that is, after completing steps 1, 2, 3, 4, and 5, run the tool to a safe position, call up the program, and press automatic run. Even if an unexpected situation such as a power outage occurs, after restarting the system, in the editing mode, move the cursor to the program section that can be processed safely without affecting the workpiece processing process, and continue processing in the automatic operation mode. The essence of using G00 instead of G50 in the first sentence of the above program is to fix the workpiece coordinate system on the machine tool. It is no longer limited by the G50 Effect. China Metal Processing Online

2. Tips for controlling dimensional accuracy

1. Modify the tool offset value to ensure dimensional accuracy

Due to the first tool setting error or other When the workpiece error exceeds the workpiece tolerance and cannot meet the processing requirements, you can modify the tool compensation to make the workpiece reach the required size. The method to ensure the radial size is as follows:

a. Absolute coordinate input method

< p>According to the principle of "reduce the large and increase the small", modify the tool compensation at 001~004. If the size of the workpiece is 0.1mm larger when cutting grooving with the No. 2 cutting tool, and the tool compensation display at 002 is X3.8, you can enter X3.7 to reduce the No. 2 tool compensation.

b. Relative coordinate method

As in the above example, inputting U-0.1 at the 002 tool offset can also achieve the same effect.

Similarly, the same goes for the control of axial dimensions. If you use the No. 1 external circular cutter to process a certain shaft segment, and the size is 0.1mm longer, you can enter W0.1 at the 001 tool offset.

2. Semi-finishing eliminates the influence of the screw gap to ensure dimensional accuracy

For most CNC lathes, after being used for a long time, due to the influence of the screw gap, the processed The workpiece size often appears unstable. At this time, we can perform a semi-finishing process after rough machining to eliminate the influence of the screw gap. For example, after using the No. 1 tool G71 to rough the outer circle, you can input U0.3 at the 001 tool offset and call G70 for fine turning once. After stopping the measurement, enter U-0.3 at the 001 tool offset and call G70 for finishing turning once again. . After this semi-finishing process, the influence of the screw rod gap was eliminated and the stability of dimensional accuracy was ensured.

3. Programming ensures dimensional accuracy

a. Absolute programming ensures dimensional accuracy

Programming includes absolute programming and relative programming. Relative programming refers to a coordinate system in which the end position of each line segment on the machining contour curve is determined with the starting point of the line segment as the coordinate origin. In other words, the coordinate origin of relative programming is often transformed, and cumulative errors will inevitably occur during continuous displacement. Absolute programming has a relatively unified reference point, that is, the coordinate origin, during the entire processing process, so the cumulative error is smaller than relative programming. . When CNC turning a workpiece, the accuracy of the radial dimensions of the workpiece is generally higher than that of the axial dimensions. Therefore, when writing programs, it is best to use absolute programming for the radial dimensions. Considering the convenience of processing and writing programs, the axial dimensions often use relative programming. , but for important axial dimensions, absolute programming is best.

b. Numerical conversion ensures dimensional accuracy

In many cases, the dimensional datum on the drawing is inconsistent with the dimensional datum required for programming, so the datum size on the drawing should be converted to Dimensions in the programming coordinate system. As shown in Figure 2b, except for the size 13.06mm, the rest are programmed dimensions obtained by directly converting the dimensions marked in Figure 2a. Among them, the three sizes of φ29.95mm, φ16mm and 60.07mm are the programming sizes obtained by taking the average of the two extreme sizes respectively.

4. Modify the program and tool compensation control size

In CNC machining, we often encounter such a phenomenon: after the program runs automatically, stop and measure, and find that the workpiece size cannot be reached. Requirements, size changes irregularly. If the No. 1 external circular cutter is used to process the workpiece shown in Figure 3, and the workpiece is stopped and measured after rough machining and semi-finishing, the radial dimensions of each shaft segment are as follows: φ30.06mm, φ23.03mm and φ16.02mm. In this regard, the author uses the method of modifying the program and tool compensation to remedy this. The method is as follows:

a. Modify the program

X30 in the original program remains unchanged, and X23 is changed to X23.03 , X16 is changed to Enter U-0.06 in place of 001.

After the two-pronged modification of the above program and tool compensation, and then calling the finishing turning program, the workpiece size can generally be effectively guaranteed.

CNC turning processing is an automated processing method based on CNC programs. In actual processing, operators can only compile high-quality processing programs if they have strong ability to use program instructions and rich practical skills. Process high-quality workpieces.

6. CNC machine tool troubleshooting methods and precautions

As I often participate in maintenance tasks and have some maintenance experience, I will now list them below based on the relevant theoretical explanations, hoping to inspire others. .

1. Troubleshooting methods

(1) Initialization reset method: Under normal circumstances, if a system alarm is caused by a transient fault, the fault can be cleared by hardware reset or switching the system power on and off. If the system working storage area is confused due to power outage, unplugging and unplugging circuit boards or battery undervoltage, the system must be initialized and cleared. Before clearing, attention should be paid to making a copy of the data. If the fault cannot be eliminated after initialization, perform hardware reset. diagnosis.

(2) Parameter change, program correction method: System parameters are the basis for determining system functions. Wrong parameter setting may cause system failure or certain functions to be invalid. Sometimes user program errors can cause downtime. You can use the system's block search function to check and correct all errors to ensure normal operation.

(3) Adjustment, optimal adjustment method: Adjustment is the simplest and easiest method. Correct system faults by adjusting the potentiometer. For example, during maintenance of a factory, the system display screen was chaotic, but it became normal after adjustment. For example, in a certain factory, the spindle belt slipped during starting and braking. The reason was that the load torque of the spindle was large, and the ramp time of the drive device was set too small, but it was normal after adjustment.

Optimal adjustment is a comprehensive adjustment method that systematically achieves the best match between the servo drive system and the driven mechanical system. The method is very simple. Use a multi-line recorder or a storage device. Functional dual-trace oscilloscope, respectively observe the response relationship between the command and speed feedback or current feedback.

By adjusting the proportional coefficient and integral time of the speed regulator, the servo system can achieve the best working state with high dynamic response characteristics without oscillation. When there is no oscilloscope or recorder on site, according to experience, adjust to make the motor start to vibrate, and then slowly adjust it in the reverse direction until the oscillation is eliminated.

(4) Spare parts replacement method: Use good spare parts to replace the diagnosed circuit board that is bad, and do the corresponding initialization startup to put the machine tool into normal operation quickly, and then repair or return the bad board. This is Currently the most commonly used troubleshooting method.

(5) Method to improve power quality: Currently, a regulated power supply is generally used to improve power fluctuations. For high-frequency interference, capacitor filtering can be used to reduce power board failures through these preventive measures.

(6) Maintenance information tracking method: Some large manufacturing companies continuously modify and improve system software or hardware based on accidental failures caused by design defects in actual work. These modifications are continuously provided to maintenance personnel in the form of maintenance information. Use this as a basis for troubleshooting to troubleshoot correctly and thoroughly.

2. Matters that should be paid attention to during maintenance

(1) When taking out a circuit board from the complete machine, note its corresponding position and connected cable number. For fixedly installed circuit boards, the corresponding crimping parts and screws should also be removed front and back for recording. The disassembled press parts and screws should be placed in a special box to avoid loss. After assembly, all contents in the box should be used, otherwise the assembly will be incomplete.

(2) The soldering iron should be placed in front of your hands, away from the repair circuit board. The soldering iron tip should be properly trimmed to adapt to the soldering of integrated circuits and avoid damaging other components during soldering.

(3) When measuring the resistance between lines, the power supply should be turned off. When measuring the resistance, the red and black test leads should be interchanged to measure twice, and the one with the larger resistance should be used as the reference value.

(4) Most circuit boards are covered with solder resist, so when measuring, you should find the corresponding solder points as test points. Do not remove the solder film. Some boards are all covered with insulating layers. Use a razor blade to scrape off the insulation layer at the solder joints.

(5) Printed circuits should not be cut off at will. Some maintenance personnel have certain experience in repairing home appliances and are used to checking for broken wires. However, most of the circuit boards on CNC equipment are double-sided metal orifice boards or multi-layer perforated boards. The printed circuits are thin and dense. Once cut, it is difficult to weld and the lines are cut. Sometimes it is easy to cut off adjacent lines, and at some points, when cutting a certain line, it cannot be separated from the line, and it is necessary to cut several lines at the same time.

(6) Components should not be replaced at will. Some maintenance personnel just rely on the feeling that a component is broken without confirming the faulty component, and immediately replace it. This has a high misjudgment rate and a high rate of human damage to the removed components.

(7) When disassembling components, you should use a solder suction device and a solder suction rope, and avoid taking them by force. The same pad should not be heated for a long time and disassembled repeatedly to avoid damage to the pad.

(8) When replacing a new device, its pins should be properly processed, and acidic soldering oil should not be used during welding.

(9) Record the switches and jumper positions on the line and do not change them at will. When performing a comparative inspection on two poles or above, or when exchanging components, be sure to mark the components on each board to avoid confusion, which may cause a good board to fail to work.

(10) Check the power supply configuration and type of the circuit board. According to the needs of the inspection, power can be supplied separately or all. Pay attention to high voltage. Some circuit boards are directly connected to high voltage, or there is a high voltage generator inside the board, which needs to be properly insulated. Special attention should be paid during operation.

Finally, I feel that we should not stick to the old rules when it comes to maintenance. We must combine theoretical things with the actual local conditions at that time, broaden our minds, analyze step by step, and eliminate them one by one until we find the real cause of the fault.

To sum up, the development of CNC technology is synchronized with the development of modern computer technology and electronic technology, and also develops according to the needs of production development. Now that CNC technology has matured, its development will be deeper, broader and faster. Future CNC systems will make machinery easier to use and cheaper.

Reference materials:

Reference materials: 1. Zhang Yaozong. Practical Manual Writing Group for Mechanical Processing. Machinery Industry Press, 1997