What is the equipment of SMT processing plant?
SMT mounting machine is the most critICal equipment, PCB board has the highest technology and stability requirements of SMT production line SMT processing plants must have these equipment before processing For more than 10 years, Chinese companies are still in the exploration stage and prototype trial production stage They have not yet launched mature products that have passed the pilot test Almost 100% of them rely on imports (except for SMAll LED placement machines);  foreign companies in China will use core placement machines.  The production site is abroad, while the factory is mainly responsible for the production of peripheral equipment and the maintenance and commissioning of the mounter in China In 2013, the import value of domestic automatic mounters reached 130.1 million U.S. dollars, mainly from Japan, accounting for 6.5% 2%；  Imports from South Korea, Germany and Singapore account for 17% 9%, 6.1%, and 3.7%, respectively
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At present, China has become a major manufacturer of electronic products in the world The degree of automation of electronic equipment is a sign of whether a country is a powerful electronic manufacturing country At present, it seems that Chinese companies have made great progress in printing presses, reflow, and AOI (Automatic Optical Inspection) equipment in SMT chip processing equipment, gradually replacing imported equipment in the field of equipment transformation Requirements for manufacturing the first SMT:
1. Check whether the BOM is the latest version.
2. Check for ECO. Check whether the materials in the bill of materials are consistent with the BOM.
3. Make part location drawing according to BOM. This is what IPQC inspectors and engineers must know. MARK the position of the part, mark the resistance on the position of the resistance, mark the specification and model on the IC, etc., so that you can find it. When there is ECO, it needs to be marked on the map accordingly. The first one can be made according to this picture.
In the host equipment of SMT mounter, it still mainly depends on imports, more than 60% of which are from Japan, and most SMT processing plant equipment is imported.
The aesthetics of PCB is fully considered in the manufacturing and design of PCB. When wiring the corners of the circuit board, the form must be selected. During the design process, it is necessary to set the corner mode of corner wiring of PCB. 45 °, 90 ° and radian can be selected. In general, acute angles are not used. It is better to use arc transition or 45 ° transition, and avoid transition with 90 ° or more acute angles.
When the wire of PCB passes through two pads and does not communicate with them, the maximum and equal distance shall be kept between them. SIMilarly, when the conductor and the conductor of the conductor pass through the two pads and do not communicate with them, they should maintain the maximum and equal spacing, and the spacing between them should also be uniform and equal, and maintain the maximum. The connection between the wire and the mat should also be as smooth as possible to avoid small sharp feet, which can be solved by filling tears. When the center distance between pads is less than the outer diameter D of pads, the width of wire can be the same as the diameter of pads; If the center distance between pads is greater than D, the width of the wire should not be greater than the width of the pad diameter.
SMT processing plant equipment is generally divided into two categories: sEMI-automatic and full-automatic
Semi automatIC chip mounting production line
Semi automatic solder paste printing machine
1) chip mounter
2) Reflow soldering
3) Connecting station
Automatic chip mounting production line
1) Autoloader
2) Oil suction machine
3) Automatic solder paste printer
4) Chip mounter
5) Reflow soldering
6) AOI test equipment
7) Automatic discharger
8) Connecting station, etc

The above is the explanation given by the editor of PCB circuit board company.
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