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What does the SMT manufacturing shop in the electronics factory do? Some workers who entered the electronics factory for the first time heard that they were assigned to the SMT manufacturing workshop, so they had a question: what is the SMT workshop? How difficult is the job? Is it dangerous? Are you tired? This article will give you a graphic, easy to understand the introduction of SMT workshop SMT production line and DIP production line. Doubts about SMT workshop Today, Xiaobian will give you a brief introduction to the SMT manufacturing workshop according to the information provided by relevant people in the industry. If you have any questions, you can contact me (my micro-number is hechina168). The SMT workshop in the electronics factory is generally divided into SMT line and DIP line. SMT workshop production line planning SMT refers to Surface assembly Technology (also known as surface mount technology) (is the abbreviation of English Surface Mounted Technology), it is the most popular technology and process in the electronic assembly industry. In simple terms, SMT is to attach electronic components to the PCB board through the equipment, and then heated by the furnace (generally refers to the reflow furnace, also known as the reflow welding furnace), and weld the components to the PCB board through the solder paste. The basic process of SMT is: solder paste printing --> Parts mounting --> reflow welding -->AOI optical inspection --> Maintenance --> sub-board. DIP is the plug-in, DIP pipeline is the plug-in welding pipeline, and some enterprises are also called PTH and THT, which are the same meaning. DIP has some large connectors, the device is not able to hit the PCB board, then it is necessary to plug into the PCB board through people or other automation equipment. The main process of DIP plug-in is: DIP plug-in main process flow SMT line mainly includes solder paste printer, material worker, pre-furnace eye inspection, post-furnace eye inspection, packaging and so on. DIP line mainly includes board casting personnel, plate removal personnel, plug-in personnel, furnace workers, after the furnace welding spot eye inspection. SMT workshop working environment Question 1: Is SMT workshop work harmful to human body? SMT workshops generally need to be ventilated, and employees need to wear overalls and protective gloves during work, because they will be exposed to some chemical agents during work. In the case of good protection, there is no major harm to human health, but if it is allergic, it is necessary to report and test in advance to prevent accidents. SMT workshop staff and wear protective work clothing Question 2: How about SMT work? SMT production line solder paste printing machine, patch machine, reflow welding (such as Haobao automatic lead-free reflow welding machine) and other equipment has been basically automated, the operator is basically standing guard, during the work is able to walk, because the need to take materials and other items. The labor intensity of the post is general, you need to understand some professional knowledge of machine operation, if you take the initiative to learn the maintenance of equipment through your own efforts, then there is also a skill in the future job search, which can be regarded as a technical post.

Select the fundamental difference between wave soldering and ordinary wave soldering. Wave soldering is the contact of the entire circuit board with the spray surface relying on the natural climb of the surface tension of the solder to complete the welding. For large heat capacity and multilayer circuit boards, wave soldering is difficult to meet the requirements of tin penetration. The dynamic tin wave is flushed out of the welding nozzle, and its dynamic strength will directly affect the vertical tin penetration in the through hole. Especially for lead-free welding, because of its poor wettability, it needs a dynamic and strong tin wave. In addition, there is no residual oxide on the strong flow crest, which will also help to improve the quality of welding. The welding efficiency of selective wave soldering is indeed not as high as that of ordinary wave soldering, because selective welding is mainly for high-precision PCB boards, which can not be welded by ordinary wave soldering. When the traditional wave welding cannot complete the through-hole group welding (defined in some special products, such as automotive electronics, aerospace, etc.), at this time, the selective welding of each solder joint can be precisely controlled by programming, which is more stable than manual welding and soldering robot, and the temperature, process, welding parameters and other controllable and repeatable control; It is suitable for today's through hole welding more and more microform, welds-intensive products. Selective wave welding is lower than ordinary wave welding production efficiency (even 24 hours), production and maintenance costs are high, the key point yield is to look at NOZZLE status. Selective wave welding main attention: 1, nozzle state. The tin flow is stable, and the wave cannot be too high or too low. 2, the welded pin should not be too long, too long the pin will cause the nozzle offset, affecting the tin flow state.

Why is SMT first Part tester so important for first part testing in SMT processing plants First of all, we need to know what are the factors that affect production efficiency in the production process? Affecting efficiency That must be the first confirmation process. A product with a low number of first pieces takes half an hour for first piece confirmation. A production model with many credits can take an hour, two hours, or even three hours to complete the first part confirmation process. In the current production process, such a first confirmation speed is far from meeting our production needs. How can we speed up our first confirmation? SMT intelligent first piece detector is a piece of detection instrument specifically for SMT first piece detection, through the combination of coordinates and BOM, as well as the display of high-definition pictures, directly reflect the material information of each position, do not need to query, operation directly by the operator to pick up the system prompts after the system automatically determines the detection result. This means of operation is simple, convenient and fast. Greatly improve the speed of your first confirmation, improve your production efficiency. How to ensure the quality of production? How do the problems of production quality come about? The more reason is that human operation is improper. Most of the time, we need to manually screen and delete the information given to us by customers, and the artificial operation will easily lead to wrong information, so that the wrong information is not detected in the process of the first detection. Lead to quality problems. The first detector does not require you to carry out redundant operations, and does not require you to go to the position information one by one. The data used by the first detector is generally required to be the original information provided by the customer, which comes from the customer, that is, the production form that the customer wants you to process. Therefore, when your first test is completed, the information is qualified, then, the product you produce now is the product that the customer requires to produce, so how can the quality not pass? Moreover, when your first piece detection is completed, the device can help you generate a first piece report, and you basically understand the process of the first piece operation when you watch the report.   SMT first tester manufacturers   What are the advantages of SMT first piece detector? SMT first piece detector can improve production efficiency, reduce labor costs, automatically judge test results, improve product quality, with traceability, strict process specifications, scan the SMT first piece PCB that needs to be tested, smart frame to obtain PCB physical scan picture, import BOM list and PCB component patch coordinates. The software intelligent synthesis and intelligent global coordinate calibration of PCB pictures, BOM and coordinates, so that the component coordinates, BOM and picture physical component position correspond one by one. By measuring the target through navigation, LCR reads the data to automatically correspond to the corresponding position and automatically judge the detection result. Avoid false test and leakage test, and automatically generate test reports stored in the database. After the continuous upgrading and improvement of the software, the system can also be applied to patch the missing parts of the material and realize the coordinate function of the coordinate meter to obtain the position coordinates of the chip components for the PCB.

Selective wave soldering, also known as robot welding, is a special form of wave soldering invented to meet the development requirements of through-hole components welding. Selective welding generally consists of three modules: flux spraying, preheating and welding. Through the device programming device, the flux spraying module can complete the selective flux spraying for each solder spot in turn, and after the preheating module is preheated, the welding module completes the welding for each solder spot point by point.

What is the significance of SMT first tester for enterprises In today's society, all kinds of electrical appliances are filled in all aspects of our lives, and people are increasingly relying on these electronic products, especially digital products and smart phones, which are a typical example. The production of these products cannot be separated from the core component - the circuit board. Because the demand for electrical appliances continues to rise, the production of PCB SMT electronics factory also continues to increase. The increase of production enterprises will inevitably bring greater competitive pressure, and only in the hands of many competitors, can enterprises survive and grow. In today's increasing competition, the rapid development of an enterprise cannot be separated from efficient work efficiency, that is, the work efficiency of employees can not be ignored. And an important factor that affects the work efficiency of employees is the quality of equipment. This requires enterprises to pay a certain cost to buy equipment. For example, the emerging SMT first tester, many companies do not think there is a need to buy, because only manual can complete the work, and then pay an additional cost is not cost-effective. However, as long as you understand this product in detail, you can know that the benefits that SMT intelligent first part tester can bring to the enterprise are in all aspects.   smt first tester company   First, the SMT first tester only needs one inspector to operate, the enterprise saves labor costs, and the operation of the SMT first tester is not complicated, and the inspector can quickly get familiar with it; Second, the speed of the first detection is improved, and the average detection of a component can be 3 seconds, further speeding up the production progress; Third, the high accuracy of the first detection can find the problem as early as possible, so as to solve the problem; Fourthly, the detection report is automatically generated, and the report is paperless to avoid accidents in data preservation. At the same time, standardized reports can bring better reading experience and enhance customers' impression of enterprise management; Fifth, the first detector can be connected with the enterprise's current ERP or MES system. In traditional SMT first detection, inspectors are often only equipped with multimeters, capacitance meters, magnifying glasses, and such simple equipment can be used in the case of fewer components, but once there are slightly more components, because of the limitations of the equipment, the energy of the staff is limited, and the difficulty of detection increases sharply. In the case of increased difficulty, the increase in detection time and error rate is inevitable. Under the current flow operation mode, the abnormal occurrence of the first detection will inevitably affect the operation of the entire production line. Especially in the case of frequent wire change, each change must be carried out a first piece detection, at this time the detection efficiency will more affect the production. There are many defects in the traditional manual SMT first detection, and the following detection report is a headache, and the manual report format is chaotic and data errors often occur. The first piece of detector will not appear such a situation, the system automatically collects test data to avoid various errors that occur when manual recording. After the test is completed, the system automatically generates the report, and can export the report in Excle format, which is very convenient for audit.

SMT basic process components include: screen printing (or dispensing), mounting (curing), reflow welding, cleaning, testing, repair. 1. Screen printing: Its role is to leak the solder paste or patch glue onto the solder pad of the PCB to prepare for the welding of components. The equipment used is a screen printing machine (screen printing machine), located at the forefront of the SMT production line. 2, dispensing: it is the glue drops to the fixed position of the PCB, its main role is to fix the components to the PCB board. The equipment used is the dispensing machine, which is located at the front end of the SMT production line or behind the testing equipment. 3, mounting: Its role is to accurately install the surface assembly components to the fixed position of the PCB. The equipment used is the SMT machine, which is located behind the screen printing machine in the SMT production line. 4, curing: its role is to melt the patch glue, so that the surface assembly components and PCB board firmly bonded together. The equipment used is the curing furnace, which is located behind the SMT machine in the SMT production line. 5, reflow welding: its role is to melt the solder paste, so that the surface assembly components and PCB board firmly bonded together. The equipment used is a reflow furnace, which is located behind the SMT machine in the SMT line. 6. Cleaning: Its role is to remove welding residues such as flux that are harmful to the human body on the assembled PCB. The equipment used is a cleaning machine, the position can not be fixed, can be online, or not online. 7, detection: its role is to assemble the PCB board welding quality and assembly quality detection. The equipment used includes magnifying glass, microscope, on-line tester (ICT), flying needle tester, automatic Optical inspection (AOI), X-RAY inspection system, function tester, etc. Location According to the need of detection, it can be configured in the appropriate place of the production line. 8, repair: its role is to detect the failure of the PCB board rework. The tools used are soldering iron, repair workstation, etc. Configures anywhere in the production line.

What external environmental factors will affect the first SMT tester As a high-precision precision instrument, any small external factors may bring measurement accuracy errors, then which external factors have a greater impact on the instrument, should be understood and paid attention to? The following Xiaobian to give you a detailed introduction. 1. Ambient temperature As we all know, temperature is the main factor in the measurement accuracy of the first tester, because the first tester is a precision instrument, so some of the production materials will be affected by thermal expansion and contraction, such as grating ruler, marble and other parts. Generally, there are strict requirements for the measurement of temperature, and the temperature is generally floating two degrees above and below 20 ° C, and there will be some changes in the accuracy beyond this range. Therefore, the machine room using the first tester must be equipped with air conditioning, and pay attention to the use of air conditioning. An air conditioner should be able to turn on 24 hours, otherwise try to ensure that it is on within 8 hours of work; Second, ensure that the first tester is used under constant temperature conditions, and then measure after the temperature of the machine room is stable; Three air conditioning mouth do not blow against the instrument. Second, environmental humidity Many companies may not pay attention to the impact of humidity on the first tester, because the instrument has a large range of acceptable humidity, and the general humidity can be between 45% and 75%. However, it should be noted that many parts of precision instruments are easy to rust, and once rust will greatly cause precision error. Therefore, pay attention to air humidity control and try to keep the equipment in a more suitable humidity environment. Pay attention especially during the rainy season or in areas that are already wet.   Production of SMT first tester 3. Environmental vibration Vibration is a common problem for the first tester, and it is difficult to avoid air compressors, presses and other heavy equipment with large vibrations. Attention should be paid to controlling the distance between these vibration sources and the first tester. There are also some small amplitude vibration sources that need attention, and if the small amplitude is close to the vibration frequency of the first tester, it is a very serious problem. However, enterprises generally install shockproof equipment on the first tester, so as to reduce the interference of vibration on the first tester and improve the measurement accuracy. 4. Environmental health The first tester this precision instrument has high environmental health requirements, if the health is poor, dust and dirty things will be left on the first tester and measurement workpiece, which will lead to measurement errors. Especially in the working machine room there are some oil, coolant, etc., be careful not to let these liquids stick to the workpiece. Usually pay attention to cleaning the machine room health, in and out of the personnel should also pay attention to health, to wear clean clothes, in and out to change shoes, reduce the outside dust oil stains into the machine room. 5. Other external factors There are also many external factors that may affect the measurement accuracy of the first tester, such as the power supply voltage, etc., the first tester needs a stable voltage when working, and the general enterprise will install equipment to control the voltage, similar to a regulator to control the voltage. The above content is the introduction of what external environmental factors affect the first tester, the first tester is based on the CCD digital image, relying on the computer screen measurement technology and the powerful software ability of space geometry. After the computer is installed with the special control and graphic measurement software, it becomes the measurement brain with the software soul, which is the main body of the whole device. Efficiency Technology SMT intelligent first detector is a high-tech product independently developed and designed by Efficiency Technology company with independent intellectual property rights. It is an innovative solution for SMT first part confirmation to achieve efficiency reduction.

1. Wave soldering is to dissolve the tin strip into a liquid state through the tin tank, and use the motor to stir to form a wave peak, so that the PCB and the parts are welded together, which is generally used for the welding of the hand plug-in and the SMT glue board. Reflow welding is mainly used in the SMT industry, which melts and welds the solder paste printed on the PCB through hot air or other thermal radiation conduction. 2. Different processes: wave soldering should first spray flux, and then go through preheating, welding, and cooling zone. Reflow welding through preheating zone, reflow zone, cooling zone. In addition, wave soldering is suitable for hand insert board and dispensing board, and all components are required to be heat-resistant, over the crest surface can not have the SMT solder paste components, SMT solder paste board can only be reflow soldering, can not use wave soldering.   Let's explain it in the simplest way possible Reflow soldering: Mechanical and electrical connections between surface-attached component terminals or pins and printed circuit board pads are achieved by remelting paste paste pre-allocated to the printed circuit board pads. It is a step in SMT (Surface Mount Technology). Wave soldering: wave soldering is a kind of automatic soldering equipment through high temperature heating to weld plug-in components, from the function, wave welding is divided into lead wave welding, lead-free wave welding and nitrogen wave welding, from the structure, a wave welding is divided into spray, preheating, tin furnace, cooling four parts.

Daily, weekly and monthly maintenance of reflow soldering Reflow daily maintenance content: (1) Check whether there is grease in the transmission chain, and add grease in time if necessary. (2) Check that there is no running edge in the transport network, and notify HB in time if there is running edge. (3) Check the reflow furnace inlet mesh belt drive wheel is not shifted, if there is a shift can be adjusted by loosening the screw - adjusting - locking the screw step. (4) Check whether the net belt drive roller at the outlet of reflow furnace is loose, if it is loose, it can be adjusted according to the steps of loosening the screws - adjusting - locking screws. (5) Check whether the high temperature oil in the oil cup is appropriate, the oil surface should be 5mm from the mouth of the cup, if necessary, add high temperature oil in time. Reflow maintenance content: (1) Check the surface of the transport network belt for dirt adhesion, if there is loot adhesion in time with alcohol scrub. (2) Check the guide rail chain groove for foreign bodies, if there are foreign bodies in time to remove the chain with alcohol scrub. (3) Check whether the bearings of the driven gear of the transport chain are flexible, and add lubricating oil in time when necessary. (5) Check whether there is grease on the surface of the lead rod of the head component and no foreign matter, wipe it clean in time when necessary, and add grease. (6) Check whether there is FLUX and dust on the rectifier plate in each area of the furnace, and clean it with alcohol in time if there is dust. (7) Check whether the lifting motor of the furnace lifting system is running without vibration and noise, if there is vibration or noise, it should be replaced in time (8) Check whether the filter of the exhaust device is blocked, if there is blockage, alcohol should be used to clean. (9) Check whether there is FLUX adsorption on the rectifier plate in the cooling area of the cooling system. If there is FLUX, it should be cleaned with alcohol in time. (10) Check that the surface of the photoelectric switch at the transport entrance has dust-free accumulation. If there is dust accumulation, it should be wiped clean with a soft dry rag in time. (11) Check whether the surface of the PC and UPS is clean. If there is dust accumulation, it should be wiped with a soft dry cloth in time. Monthly maintenance contents of reflow welding: (1) Check whether there is vibration and noise in the transportation process, and notify HB in time if necessary. (2) Check whether the transport motor fixing screw is loose, if it is loose, lock the screw. (3) Check whether the tension of the transmission chain is appropriate, and adjust the motor positioning screw in time if necessary. (4) Check whether there is coke and black powder on the transport chain, if there is, it should be removed in time and cleaned with diesel oil. (5) Check the positioning of the synchronous shaft of the width adjustment in the track of the active end, and whether the fixed block is loose. If it is loose, it should be locked in time. (6) Check whether the hot air motor positioning screw is loose, if loose, it should be locked in time. (7) Check whether there is dust and foreign matter in the control box of the electrical system. If there is foreign matter, blow out dust and foreign matter with the same pressure air after power off.

Wave soldering refers to the melting of soft brazing material (lead-tin alloy), through the electric pump or electromagnetic pump jet into the design requirements of the solder crest, can also be formed by injecting nitrogen into the solder pool, so that the printed board pre-equipped with components through the solder crest, to achieve the mechanical and electrical connection between the component welding end or pin and the printed board welding pad. Wave soldering process: Insert the component into the corresponding component hole → pre-apply flux → preheat (temperature 90-100℃, length 1-1.2m) → Wave soldering (220-240℃) cooling → remove excess pin → Check.   Wave soldering with the enhancement of people's awareness of environmental protection has a new welding process. In the past, tin-lead alloy was used, but lead is a heavy metal that has great harm to the human body. Therefore, the lead-free process is promoted, the use of * tin silver copper alloy * and special flux, and the welding temperature requires higher preheating temperature. In most of the products that do not require miniaturization and high power are still using perforated (TH) or mixed technology circuit boards, such as televisions, home audio and video equipment and digital set-top boxes, are still using perforated components, so the need for wave soldering. From a process point of view, wave soldering machines can only provide a few of the most basic equipment operating parameters adjustment.

Many people are not familiar with reflow welding, because they have not operated or seen it, the concept of reflow welding is very vague, then what is reflow welding?   Reflow is the soldering of mechanical and electrical connections between the solder ends or pins of surface-assembled components and the printed board solder pad by remelting the paste solder preallocated to the printed board pad. Reflow welding is to weld the components to the PCB board, and reflow welding is to mount the devices on the surface. Reflow welding is based on the action of hot gas flow on the solder joint. The gel flux reacts physically under certain high temperature air flow to achieve SMD welding. The reason why it is called "reflow welding" is because the gas circulates in the welding machine to produce high temperature to achieve the purpose of welding. Reflow technology is not new in the field of electronics manufacturing. The components on the various boards used in our computers are welded to the circuit board through this process. This device has a heating circuit inside the device, and the air or nitrogen is heated to a high enough temperature to blow to the board that has been attached to the components, so that the solder on both sides of the components is melted and bonded to the motherboard. The advantages of this process are that the temperature is easy to control, oxidation can be avoided during welding, and manufacturing costs are easier to control. There are several categories of reflow welding: hot plate conduction reflow, infrared reflow, gas phase reflow, hot air reflow, infrared + hot air reflow, hot wire reflow, hot gas reflow, laser reflow, beam reflow, induction reflow, polyinfrared reflow, table reflow, vertical reflow, nitrogen reflow.

Golden snake, happy Spring Festival! Global Soul Limited holiday notice Global Soul Limited users, partners, friends: The Spring Festival is approaching, thank you for your support and companionship for Global Soul Limited! Spring Festival holiday, the company will be closed from January 26, 2024 (27th of the twelfth month) to February 4, 2024 (7th of the first month), and February 5, (8th of the first month). Global Soul Limited wishes you all a happy and auspicious New Year of the Snake!