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SMT patch
1. The assembly density is high, and the PCB electronic products are light in weight and small in size.
Compared with traditional perforated components, the quality and area occupied by PCB chip components are greatly reduced. Generally, the use of SMT patch technology can reduce the quality of electronic products by 75% and the volume by 60%.
2. Strong anti-vibration ability and high reliability
Because PCB electronic components have short or no pins, and are firmly mounted on the surface of the PCB, the SMT patch has strong anti-vibration capability and high reliability. The solder joint defect rate of SMT patch is one order of magnitude lower than THT.
3. PCB high frequency characteristics are good
Because the electronic components reduce the influence of the lead distribution characteristics, and the PCB surface is firmly soldered, the parasitic inductance and parasitic capacitance between the leads are greatly reduced, so the radio frequency interference and electromagnetic interference are greatly reduced, and the High frequency characteristics.
4. Improve production efficiency, easy to realize automation
Compared with THT, SMT is more suitable for automated production. THT requires different inserting machines (DIP inserting machine, axial inserting machine, radial inserting machine, taping machine, etc.) according to different components. Each machine needs to adjust the assembly time, and the maintenance workload is large. However, SMT only uses one placement machine with different placement heads and racks to install all types of electronic components, reducing maintenance workload and adjustment preparation time.
5. Reduce costs
The SMT patch makes the PCB wiring density increase, the area becomes smaller, the number of holes is reduced, and the number of PCB layers with the same function is reduced, all of which reduce the manufacturing cost of the PCB. Components with short leads or no leads save lead materials, omit bending and trimming processes, and reduce manpower and equipment costs. The improvement of frequency characteristics reduces the cost of radio frequency debugging. The size and weight of electronic products are reduced, which reduces the cost of the whole machine. The welding reliability is good, so that the repair cost is reduced. Therefore, after general electronic products adopt SMT patch technology, the total product cost can be reduced by 30%-50%.
As the development of science and technology becomes more and more violent, technology is also making steady progress in the expectations and research of everyone, and it can gradually develop towards higher speed, lower cost and smaller size!
smt device function
The smt device is mainly used for. And we have introduced a lot of SMT equipment in the front, let’s take a look at the function of SMT equipment together today!
smt device
1. Loading machine: The PCB is placed in the Rack and automatically sent to the suction machine.
2. Board suction machine: automatically pick up the PCB, place it on the track, and transfer it to the printing machine.
3. Printing machine: The solder paste or red glue on the laser steel is completely printed on the PCB.
4. High-speed placement machine: Use the program edited by the equipment to place the components on the specified part position, which can be loaded with roll parts below SOP28pin, which is characterized by fast loading speed.
5. Docking station: a device for transferring PCB boards.
6. Universal placement machine: Use the program edited by the equipment to place the components on the specified part position, and can place the roll, disc or tube packaging components above SOP28pin (including components that can be placed on high-speed machines). It is characterized by high precision and diversification, but the speed is inferior to high-speed machines.
7. Reflow soldering: Use the SMT solder paste or red glue to set a proper temperature curve to complete the soldering action between the solder paste and the parts.
8. Unloader: through the transmission track, unloader in the magzine.
9. Optical detector: automatic optical inspection is a device that detects common defects encountered in welding production based on optical principles. AOI is a new type of test technology that has only emerged in recent years, but it has developed rapidly. At present, many manufacturers have introduced AOI test equipment. During automatic inspection, the machine automatically scans the PCB through the camera, collects images, compares the tested solder joints with the qualified parameters in the database, after image processing, checks out the defects on the PCB, and displays/marks the defects through the display or automatic signs Come out and be repaired by maintenance personnel.
10. X-ray machine: mainly used to detect various industrial components, electronic components, and the inside of circuits. Such as the detection of socket plug rubber internal circuit connection, diode internal welding, BGA welding, etc. An X-ray machine is an X-ray machine that can be connected to a computer for image processing. This type of industrial inspection portable X-ray machine provides an excellent solution for the maintenance of factory home appliances.
As one of the emerging technologies, the PCBA circuit board is an indispensable and important link, and the knowledge of SMT placement is naturally not less than that of PCBA.
