SMT processing equipment and inspection items

SMT processing equipment and inspection items
SMT production and processing equipment is a kind of SMT production line used in electronic processing and manufacturing There are many SMT processing equipment SMT is the most important SMT equipment, solder paste printing machine, reflow soldering, automatic optical detection, plate feeder, connecting station, etc Each machine and equipment has a designated function and purpose Let's talk about various SMT processing equipment
1SMT mounting machine
SMT mounters can be divided into three types: turret mounters, arch mounters and modular mounters.
SMT mounter is the core of SMT production technology. Its main function is to use the specified method to accurately and quickly place the packaged electronic components on the matching position of PCB. It is a leader in high-precision electromechanical integration machinery and equipment, which comprehensively uses high-tech technologies such as light, electricity and gas.

2. SMT processing printing machine
SMT processing printing machine mainly includes three types: manual printing machine, semi-automatic printing machine, and full-automatic printing machine
The printing press is the starting point of the SMT production line and the leader of the quality and efficiency of the SMT part in the electronic digital product assembly. The tin material is mainly coated on the matching pad of PCB evenly with wire mesh. Its working principle is similar to the school ink test paper. With the increasing requirements for the production and assembly of electronic digital products, most companies use automatic printing equipment.
3. SMT processing reflux furnace
Reflow soldering furnace is the guarantee of surface assembly quality of electronic digital products. It mainly uses hot air convection to continuously heat the solderless PCB to melt and cool the welding materials, and solidify the components and PCB pads as a whole.
4. AOI mechanical equipment
AOI is an efficient quality inspection equipment in the electronic and digital product assembly industry. It uses image contrast to quickly and accurately detect various types of defects generated in each part of the production process.
What are the inspection items before SMT chip processing?
1. Assembly inspection before smt wafer processing: the main inspection items of the assembly include solderability, pin coplanarity and usability, which shall be sampled by the inspection department To test the solderability of components, stainless steel tweezers can clamp the main body of components, immerse it in a tin pot with a temperature of 235 ± 5 ℃ or 230 ± 5 ℃, and take it out for. 2s or 3 ± 0.5 seconds when the temperature is 2 ± 0. Check the welding end of solder under a 20 fold microscope, and more than 90% of the welding end of components are required to be welded The smt chip processing workshop can conduct the following visual inspections: 1 Visually or with a magnifying glass, check the welding end or pin surface of the component for oxidation or contamination 2. Nominal value, specification, model, accuracy, and overall dimensions of components shall meet the product process requirements 3. The pins of SOT and SOIC shall not be deformed For multi lead QFP devices with lead spacing less than 0, the pin coplanarity should be less than 0.1mm (optical inspection by the placement machine) 4. For products that need to be cleaned before smt wafer processing, the marks of components will not fall off after cleaning, and will not affect the performance and reliability of the components (visual inspection after cleaning) 2. Printed circuit board (PCB) inspection before smt chip processing (1) PCB grounding mode and size, welding mask, silk screen and through-hole settings shall meet the design requirements of smt PCB (Example: Check whether the pad spacing is reasonable, whether the screen is printed on the flat plate, whether vias are made on the pad, etc.). (2) The external dimensions of the PCB should be consistent, as well as the external dimensions, positioning holes, and PCB reference marks should meet the requirements of the production line equipment