What is the relationship between SMD, SMT and BOM of SMT Factory?
SMT is a surface mount technology, also known as surface mount technology (short for Surface Mounted Technology), which is currently the most popular technology and process in the electronics assembly industry.
SMD is in the form of a rectangular sheet, a cylindrical row or a profile, and its soldered ends or pins are fabricated in the same plane, and are suitable for the electronic components adhered to the surface mounter. Reflow soldering: pre-distributed to the PCB circuit by de novo melting The paste solder paste on the pad of the board completes the mechanical and electrical connection between the terminals or pins of the external adhesive component and the printed circuit board pads.
SMT and SMD use the no-cleaning process in the appearance of the surface-mounting skills. The waste water discharged after the cleaning of the products during the production process brings water, land and animal and plant pollution. In addition to water cleaning, the use of organic solvents rich in chlorofluorohydrogen (CFC & HCFC) for cleaning, pollution and damage to the air and atmosphere. The residue of the cleaning agent on the machine board brings corrosion to the surface, which seriously affects the quality of the supplier. Reduce the cost of cleaning operations and machine protection. No-cleaning reduces the damage that can be formed during the movement and cleaning of the assembly board (PCBA). There are still some components that can't be cleaned.
The flux residue has been manipulated and can be used in conjunction with the appearance of the product to prevent visual inspection of the cleaning situation. Residual flux has continually improved its electrical function to prevent product leakage and any damage. The no-wash process has undergone several international safety tests to prove that the chemicals in the smt placement machine flux are stable and non-corrosive.
Therefore, it is also called a product structure table or a product structure tree. In some industries, it may be called a "recipe", "element table" or other name. In the MRPII and ERP systems, the term material has a broad meaning. It is a general term for all products, semi-finished products, work-in-progress, raw materials, accessory parts, collaborative parts, consumables, etc.