To understand the SMT production line, we must first know what SMT process is. The full name of the "SMT" is surface mount technology. Generally, the SMT process is to mount electronic components, such as resistors, capacitors, transistors, integrated circuits, etc., on a printed circuit board and form electrical connections through the wave solder process. Then, the components used by surface mount technology are referred to as surface mounted components for short. Therefore, the SMT line is a pcb assembly line composed of surface coating equipment, placement machines, welding machines, cleaning machines, testing equipment, and other pcb SMT assembly equipment. We also call it the SMT assembly line.

At present, the types and specifications of SMT components in surface mount technology are not yet complete. Therefore, sometimes part of the through-hole (THT) components needs to be inserted into the pcb SMT assembly. Generally speaking, surface mounted components often have two types: insert and mount. Only some surface mounted components will use SMC or SMD production lines. The inserts and mountings in the SMT production line become a hybrid assembly. All AMT assembly lines that use SMC/SMD (SMD production line) become surface assembly.

According to different assembly objects, assembly processes, and assembly methods, SMT process has a variety of pcb assembly lines or SMT assembly lines.

We generally use the SMT production line of reflow soldering technology when assembling surface mounted devices on one side of the PCB, also known as the single-line form. If we assemble SMC or surface mounted devices on both sides of the PCB, we need a two-line SMT production line. If the interposing parts and the placement parts exist simultaneously in the pcb SMT assembly, sometimes it is necessary to add the interposing assembly line and corresponding equipment based on the original pcb SMT assembly line. When the non-free cleaning assembly is used in Gongyi City, additional post-weld cleaning equipment is required. At present, some large-scale SMT manufacturers have established equipment with feeding trolleys. The surface mounted components are controlled and managed by the computer. This is an advanced organization form for automated assembly and SMT production lines.

Closer to home, what processes does the SMT production line include? If we want to find a professional SMT manufacturer, we must understand the SMT assembly line process. The following is the general process of the SMT production line. The solder paste coating method, soldering method, and dispensing process are all different depending on the wiring method.

1. Printing: The solder paste or patch glue is printed on the smt stencil to prepare for the soldering of the components. All equipment is a solder paste printer located at the forefront of the SMT production line.
www,allaismt,com

2. Dispensing: It is to drop the glue onto the fixed position of the smt stencil, and its main function is to fix the surface mounted components on the PCB when wave soldering is used. The equipment used is a glue dispenser located at the forefront of the SMT production line or behind the testing equipment.

3. Mounting: The surface mounted components are accurately mounted on the fixed position of the smt stencil. The equipment used is a placement machine located behind the solder paste printer in the SMT production line.

4. SMD glue curing: When using SMD glue, the SMD glue is cured so that the surface assembly components and smt stencil are firmly bonded together. The equipment used is a curing oven located behind the placement machine in the SMT production line.

5. Reflow soldering: Melt the solder paste to firmly bond the surface mounted components and smt stencil. The equipment used is a reflow oven. Located behind the placement machine in the SMT production line.

6. Clear: Remove the solder residues, such as flux, harmful to the human body or the product on the assembled PCB. The equipment used is a cleaning agent, and the unknown may not be fixed. It may be online or offline. When using no-clean welding technology, this process is not provided.

7. Inspection: inspect the welding quality and assembly quality of the assembled SMA (surface mount component). The equipment used includes a magnifying glass, microscope, online tester (ICT), first article tester, flying probe tester, automatic optical tester (AOI), X-RAY tester, function tester, etc. Unknown According to the testing needs, it can be configured in a suitable place on the smt line.

8. Repair: Repair the SMA that is faulty. The tools used are electric soldering irons, rework workstations, etc. Configured anywhere in the smt line.

свернуть