Comprehensive Analysis of SMT Factory Processing Workflow

In the field of electronic product manufacturing, the SMT (surface mounting technology) processing process is the key link to ensure product quality and performance. The following is a detailed introduction to the processing process of the SMT factory, and at the same time explain the advantages of Shenzhen Sigote Electronics in all aspects. Today, the editor of Sigote has specially sorted out the relevant content. I hope it can help you after reading it!

PCB preparation

This is the starting point of SMT processing. First of all, the PCB board should be cleaned to remove oil, dust and other impurities on the surface to ensure its cleanliness. Then carry out a comprehensive inspection to see if there are problems such as line outage, short circuit and board damage. For some PCB boards with strong moisture absorption, it is also necessary to pre-bake to reduce their water content to prevent the occurrence of plate bursting in subsequent high-temperature processing. Shenzhen Sigate Electronics has a professional PCB testing team and advanced equipment, which can accurately identify all kinds of potential problems of PCB boards, ensure that the quality of PCB boards entering the next link meets the standard, and lay a solid foundation for high-quality SMT processing.

Solder paste printing

The printing link of solder paste is very important, which determines the quality of component welding. Screen printing or steel mesh printing is usually used to coat the paste evenly and accurately on the solder pads of the PCB board. During the printing process, the thickness, uniformity and position accuracy of the soldering paste are extremely high. A slight deviation may lead to welding defects such as false welding and short circuit. Shenzhen Sigot Electronics is equipped with high-precision printing equipment, such as advanced fully automatic printing machines, with professional process engineers, which can accurately adjust the printing parameters according to the characteristics of different PCB boards and components to ensure the high quality of solder paste printing. Its printing accuracy can be controlled within the range of a very small tolerance, for the follow-up Patching and welding provide a strong guarantee.

Component installation

The step is to accurately place various electronic components into the corresponding solder pad position of the PCB board. There are manual pasting and machine pasting. Manual pasting is suitable for small, special or large-scale components; machine pasting relies on high-speed and high-precision pasting machines to realize large-scale and high-efficiency component pasting. Shenzhen Sgote Electronics has 7 Yamaha chip machines operated by an 80-person professional SMT DIP team. These chip machines have high-speed and high-precision chip ability, which can meet different types of components, including tiny 0201, 01005 components and BGA/C The installation demand of complex packaging components such as SP has greatly improved the installation efficiency and quality.

Reflow welding

Reflow soldering is the key process of melting the solder paste, so as to realize the electrical connection and mechanical fixation of components and PCB boards. Through the reflow soldering furnace, the PCB board passes through the preheating area, heating area, reflow area and cooling area in turn. In different areas, the temperature changes accurately according to a specific curve to ensure that the flux in the solder paste works, removes the oxides on the surface of the component pins and pads, so that the solder melts and forms a firm welding point after cooling. Shenzhen Sigote Electronics adopts 3 high-performance 8-temperature zone reflow welding equipment, which can accurately control the welding temperature curve, ensure the stable and reliable quality of welding points, and effectively reduce the defective rate of welding such as false welding and bridging. The welding point defect rate is ≤50ppm, which is far lower than the industry average of 200-500ppm. .

Testing and repair

After the welding is completed, the PCBA needs to be fully tested. Using AOI (Automatic Optical Detection) equipment, it can detect whether the installation position and polarity of the components are correct, and whether there are appearance defects such as false welding, short circuit, missing welding, etc. at the welding point; X-ray detection equipment can deeply detect the welding inside BGA and other packaging. Once a problem is found, the professional repair personnel will repair it in time. Shenzhen Sigote Electronics is equipped with advanced AOI, X-ray and other testing equipment to carry out 100% testing of products to ensure excellent factory product quality. At the same time, its professional repair team has rich experience and can quickly and accurately solve all kinds of detected problems.

Post-processing and packaging

After completing the inspection and repair, according to the customer's needs, PCBA may be subjected to three-proof paint coating and other post-treatment to enhance its moisture-proof, dust-proof and anti-corrosion performance. Finally, the qualified PCBA products are packaged and ready for delivery. Shenzhen Sigote Electronics pays attention to details in the packaging process and adopts appropriate packaging materials and methods to prevent products from being damaged during transportation. Shenzhen Sigote Electronics focuses on one-stop services for small and medium-sized batches of PCBA. In addition to showing excellent advantages in all aspects of the SMT processing process, it also provides full-process services such as Layout design, procurement of patch materials, BOM order distribution, etc., with IATF16949, ISO1 3485, ISO9001, ISO45001 and other qualification certifications, serving 180+ countries and regions, 5W+ global customers, daily shipment 3000+, accumulated deep in industrial control equipment, automotive electronics, medical equipment, security equipment, communication equipment and other industries With rich experience and can provide an 8-hour urgent response to meet the urgent needs of customers, it is a high-quality choice in the field of SMT processing.