Saturday, April 2, 2011

SMT(Surface Mounted Technology)

SMT(Surface Mounted Technology) Electronics assembly industry is now one of the most popular technology and process.
SMT differ
High density assembly, electronic products small volume, light weight, patch of components of the bulk and weight only traditional cartridge elements 1/10 or so, generally USES the SMT later, electronic product size decreased 40% ~ 60%, and the weight 60% ~ 80%.
High reliability, ant-vibration ability. Solder defects is low.
High frequency characteristic well. Reduce the electromagnetic and rf interference.
Easy to realize the automation and improve production efficiency. Reducing cost up to 30% ~ 50%. Save material, energy, equipment, human, time, etc.
Why should use SMT
Electronic products used in pursuit of miniaturization, already cannot narrow punched plugin components.
Electronic product function more complete, the integrated circuit (IC) has no perforation components, especially large-scale, high integration IC, had to adopt surface patch components.
Products PiLiangHua, automated production with lower cost, the manufacturer to produce high yield, high quality products to meet customer demand and strengthen market competitiveness
Electronic components development, integrated circuit (IC) development, semiconductor materials to multiple applications.
Electronic technology revolution is imperative, chasing after the international trend.
SMT basic process elements
Printing (or dispensing) - - > mounted - - > (cured) - - > reflow soldering - - > > testing - clean - - > repair. -
printing
Its role is to its solder paste or patch of the PCB soldering to glue plate, preparing for the components of welding. Equipment used for printing presses SMT processing workshop
(solder paste printer), located in the SMT production line forefront.
dispensing
For now the circuit board is mostly used to prevent second patch, double down the components when solder paste into because of melting and fall off, so again in input face plus deck gum machine, it is will glue drops to the PCB's fixed position, its main effect is fixed to a PCB components. Equipment used for dispensing machines, is located in the forefront of the SMT production line behind or testing equipment. Sometimes due to the customer request output surface also need some glue, and now many small factories all need not glue machine, if input surface components bigger when employing worksite glue.
mounted
Its role is accurate installations assembly components will surface of fixed position to the PCB. Equipment used for placement machine, located in SMT production line behind in printing machine.
curing
Its role is to melt, thereby patch rubber surface mount components and PCB firm bonding together. Equipment used for curing furnace, located in SMT lines behind the placement machine.
Reflow soldering
Its role is to melt, make surface solder paste with PCB assembly components firm bonding together. Equipment used for reflow oven, located in SMT lines behind the placement machine.
cleaning
Its role is to assemble good PCB above the harmful to human body welding residual such as flux, etc to eliminate. Equipment used for cleaner, position can not fixed, online, also can not online.
detection
Its role is to assemble good PCB assembly welding quality and quality detection. Equipment used a magnifying glass, microscope, online tester (ICT), flying probe tester, automatic optical inspection (AOI), X - RAY detection system, function tester, etc. According to the need of place, can configure test in line appropriate place.
repair
Its role is to detect malfunction redo the PCB. Tools for iron and repair workstation, etc. In any position in line configuration. 

No comments:

Post a Comment