Profesional in AI/SMT machine and spare parts of AI/SMT .
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Electronics manufacturing using surface-mount technology (SMT) simply means that electronic components are assembled with automated machines that place components on the surface of a board (printed circuit board, PCB).
Electronics manufacturing using surface-mount technology (SMT) simply means that electronic components are assembled with automated machines that place components on the surface of a board (printed circuit board, PCB). In contrast to conventional through-hole technology (THT) processes, SMT components are placed directly on the surface of a PCB instead of being soldered to a wire lead. When it comes to electronic assembly, SMT is the most frequently used process in the industry.
Electronic assembly encompasses not only placing and soldering components to the PCB, but also the following production steps:
Applying soldering paste is one of the first steps in the SMT assembly process. Soldering paste is “printed” on the boards using the silk-screen method. Depending on the design of the board, different stainless-steel stencils for “printing” the paste onto the board and various product-specific pastes are used. Using a laser cut stainless-steel stencil custom made for the project, the soldering paste to be applied only to the areas where components will be soldered. After the soldering paste is on the boards, a 2D-soldering paste inspection is performed to ensure that the paste is evenly and correctly applied. Once the accuracy of the soldering paste application has been confirmed, the boards are transferred to the SMT assembly line, where the components will be soldered.
The electronic components to be assembled come in trays or reels, which are then loaded into the SMT machine. During the loading process, intelligent software systems ensure that components are not inadvertently switched or misloaded. The SMT assembly machine then automatically removes each component with a vacuum pipette from its tray or reel and places it on its correct position on the board using precise pre-programmed X-Y coordinates. Our machines are capable of assembling up to 25,000 components per hour. After the SMT assembly is completed, the boards are moved on to the Reflow ovens for soldering, which affixes the components to the board.
To solder electronic components, we use two different methods, each of which has distinct advantages depending on the order quantity. For series production orders, the Reflow-soldering process is used. During this process, boards are put in a nitrogen atmosphere and are gradually warmed up with heated air until the soldering paste melts and the flux vaporizes, which fuses the components to the PCB. After this stage, the boards are cooled off. As the tin in the soldering paste hardens, the components become permanently affixed to the board and the SMT assembly process is completed.
For prototypes or highly sensitive components, we have a specialized vapor-phase soldering process. In this process, boards are heated until the specific melting point (Galden) of the soldering paste is reached. This allows us to solder at lower temperatures or solder different SMT components at different temperatures depending on their individual soldering temperature profiles.
Soldering is the second-to-last step of the SMT assembly process. In order to ensure the quality of the assembled boards, or to catch and correct a mistake, AOI visual inspections are performed for almost all series production orders. Using several cameras, the AOI system automatically checks each board and compares the appearance of each board with the correct, pre-defined reference image. If there are any deviations, the operator of the machine is informed of the potential problem, who then corrects the mistake or pulls the board from the machine for further inspection. The AOI visual check ensures consistency and accuracy in the SMT assembly production process.
Before manufacturing led lights, it’s very important to conduct SMT factory planning, especially for any newly-built SMT factory. New factories have little experience in SMT factory design layout and SMT workshop design so there may be some details lost during the set-up phase. After production begins, discovering problems after the fact can cause unnecessary losses. So why not design your SMT factory layout and plan with these potential issues in mind and prepare in advance? Learn SMT clean mounting workshop production requirements in this article.
SMT workshop production requirements:
1. Workshop bearing capacity, vibration, noise requirements:
Factory ground bearing capacity should be greater than 8 kn/m2.
Vibration should be controlled in less than 70 db, the maximum value of no more than 80db.
The noise should be controlled within 70 dba.
2. Power supply:
General requirements of single-phase AC220 (220 + / – 10%, 0/60 hz), three-phase AC
380 (380 + / – 10%, 50/60 hz), more than double the power consumption of power supply of power than.
3. Air:
According to the requirement of the equipment configuration of air pressure, can use plant air, and also be configured individually oil-free compressed air machine, general pressure is greater than 7 kg/cm2.
For clean, dry cleaning the air, so the need for compressed air to oil, dust and water treatment.Made from stainless steel or pressure plastic air duct.
4. Exhaust:
Reflow soldering and wave soldering equipment need exhaust fan.For hot blast stove, exhaust pipe of the minimum flow rate value is 500 cubic feet per minute (14.15 m3 / min).
5. Lighting:
In the ideal of the plant Illumination is 800 ~ 1200 lux, at least not less than 300 lux, when low intensity of illumination, in the inspection, repair, measurement work areas should install local lighting.
6. Work environment:
Factory to keep clean, no dust, no corrosivegas.Production workshop should have cleanliness control, control the cleanliness: the class of 500000.
Production workshop environment temperature to 23 + / – 3 ℃ is the best, average of 17 ~ 28℃,relative humidity is 45% ~ 45% RH.
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As we all konw ，it’s very necessary to verify material component in SMT industry.
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Surface Mounted Technology (SMT) is one such approach that works by mounting the circuit components directly onto the printed circuit board resulting into what is called a surface mount device. This is a common replacement for the traditional soldering into holes in a circuit board since it results to tightly squeezed and versatile builds.
There are some important things to know before venturing into SMT
1.The procedure to doing the job
A specially designed printed circuit board is needed for the job. In automated placement, components to be added to the circuit board are placed onto the PCB by pick-and-place machines before the board is placed in a reflow soldering oven, which slowly and uniformly raises the board’s temperature until the thin film of solder material melts and clamps the components into place. The function of the reflow oven varies depending on the design concerns with the most common being infrared lamps, hot gas convection and use of special fluorocarbon liquids.
2.Tools needed for the job
To achieve the desired environment in SMT production, you have to use the right tools that depend on the precision of the job you do. The choice of tools, board material and ovens, you have to determine the design of your circuit before making the call. The tools used in an SMT procedure dictate the success or failure of product.
3.Advantages
The bright side of SMT assembly lies in the fact that these techniques can handler smaller components and achieve higher component density. With the option to solder onto both sides of the board and lower induction and induction at the contacts, this technique is the solution to creation of highly integrated circuits that are on high demand, as miniaturization of components becomes the order of the day.
4.Disadvantages
On the other hand, problems come with the SMT manufacturing. For instance, the techniques makes repair difficult in case the equipment needs to have some components replaced, SMT components do not work with plug in breadboards, is unsuitable for high power components like electric circuits and is not a good way of creating contacts for connectors that interface with outer world hence subject to frequent mechanical stress.
5.SMT Production does not work in all cases
It is important to know that SMT does not support all types of applications in a circuit. While the technology is right with most of the tasks that traditional soldering can address, it cannot handle some special cases. For instance, the soldering of transformers and mounting of heat sinks must be done the traditional way if at all these components has to work properly.
6.Analyze your market and learn the legislations governing the market
Before venturing into SMT manufacturing, you have to be sure that you have the demand. SMT equipment has very high capacity and requires trained personnel and engineers. You have to weigh the market to ensure that you do not invest in hardware that will lie to waste in a ware house waiting for meager contracts in on and off basis.
Finally, you must understand that there are some conventions set up by different quality management firms to ensure that equipment delivered to the market are up to standard. To remain on the safe side of the law and other regulations, ensure that your operations remain legal and top quality to maintain your reputation in the market
If you want to know more about SMT whole line ,such as picture ,video and ppt .You can contact me .
Email :quella @smthelp.net
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