What is an SMT production line?
The SMT production line refers to the surface assembly equipment that forms the SMT production system, such as surface coating equipment, placement machines, welding machines, cleaning machines, and testing equipment.
Composition of SMT production line
The components of the SMT production line mainly include the following categories:
1)Solder paste printing machine
Its function is to print solder paste or patchtape onto the pads of the PCB.
2)Dispensing machine
Drip the glue onto the PCB fixing position.Its main function is to fix the components on the PCB.
3)SMT machine
Surface mount components are installed accurately to the fixed position on the PCB.
4)Curing furnace
When using SMD adhesive, solidify the SMD adhesive so that the surface mount components and the PCB are firmly stuck together.
5)SMT Reflow oven
By melting the solder paste,the surface mount components stick firmly on the PCB.
6)Washing machine
Remove welding residues, such as flux, that are harmful to the human body or products on the assembled PCB.
7)Test Equipment
Inspect the welding and assembly quality of the assembled SMA (surface mount assembly).
SMT line assembly ways
Depending on the assembly objects, assembly processes, and assembly methods, SMT production lines have a variety of assembly methods.
1)Single line form
Generally, it is used for surface PCB assembly of SMC/SMD on one side of the PCB.
2)Dual-line form
It is used for surface assembly of SMC/SMD on both sides of the PCB.
3)Mixture form
There are inserts and mounts of the assembly.
4)Integrated form
SMT product integrated assembly system equipped with feeding trolley, controlled and managed by computer.
SMT production line process
The process of an SMT production line generally includes the following steps:
• Printing: Solder paste or patch tape printed on to the pads of the PCB to prepare for the soldering of components.
• Glue dispensing: Glue drops onto the fixed position of the PCB. The function is to fix the components on the PCB when using wave soldering.
• Mounting: Surface mount components are installed accurately to the fixed position of the PCB.
• Curing: When using SMD adhesive, curethe SMD adhesive so that the surface assembly components and PCB are firmly stuck together.
• Reflow soldering: Melting the solder paste makes SMT components stuck on the PCB.
• Cleaning:Remove welding residues, such as flux, that are harmful to the human body or products on the assembled PCB.
• Inspection:Inspect the welding and assembly quality of the assembled SMA (surface assembly assembly).
• Return for repair:Return for repair has detected a fault of the SMA.
Characteristics of SMT production line
SMT production line has the following characteristics:
The high degree of automation: The SMT production line uses a lot of automated equipment, reducing manual operations and improving production efficiency and product quality.
• High productivity: The production efficiency of SMT production lines is many times higher than that of traditional plug-in production lines.
• Low product cost: SMT production lines can reduce material consumption and labor costs, there by reducing product costs.
Application of SMT production line
SMT production lines have been used widely in the fabrication of various electronic products, such as computers, mobile phones, TVs, automotive electronics, etc.
Development Trend of SMT Production Line
The development trends of SMT production lines mainly include the following aspects:
High-density:As electronic products continue to become tiny and intelligent, SMT production lines will also develop in the direction of high-density.
Multifunctional: SMT production lines will develop towards multifunctional to satisfy the needs of different products.
One-stop PCB Fabrication and Assembly from Circuit Card Assembly
