Shenzhen Yingsheng Technology Co., Ltd. |
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Step 2: Pick and Place
After applying the solder paste to the PCB board, the PCBA process
moves on to the pick and place machine, a robotic device places
surface mount components, or SMDs, on a prepared PCB. SMDs account
for most non-connector components on PCBs today. These SMDs are
then soldered on to the surface of the board in the next step of
PCBA process.
Traditionally, this was a manual process done with a pair of
tweezers, in which assemblers had to pick and place components by
hand. These days, thankfully, this step is an automated process
among PCB manufacturers. This shift occurred largely because
machines tend to be more accurate and more consistent than humans.
While humans can work quickly, fatigue and eyestrain tends to set
in after a few hours working with such small components. Machines
work around the clock without such fatigue.
The device starts the pick and place process by picking up a PCB board with a vacuum grip and moving it to the pick and place station. The robot then orients the PCB at the station and begins applying the SMTs to the PCB surface. These components are placed on top of the soldering paste in preprogrammed locations.
Step 3: Reflow Soldering
Once the solder paste and surface mount components are all in
place, they need to remain there. This means the solder paste needs
to solidify, adhering components to the board. PCB assembly
accomplishes this through a process called "reflow".
After the pick and place process concludes, the PCB board is
transferred to a conveyor belt. This conveyor belt moves through a
large reflow oven, which is somewhat like a commercial pizza oven.
This oven consists of a series of heaters which gradually heat the
board to temperatures around 250 degrees Celsius, or 480 degrees
Fahrenheit. This is hot enough to melt the solder in the solder
paste.
YScircuit HDI PCB manufacturing capabilities overview | |
Feature | capabilities |
Layer Count | 4-60L |
Available HDI PCB Technology | 1+N+1 |
2+N+2 | |
3+N+3 | |
4+N+4 | |
5+N+5 | |
Any layer | |
Thickness | 0.3mm-6mm |
Minimum line Width and Space | 0.05mm/0.05mm(2mil/2mil) |
BGA PITCH | 0.35mm |
Min laser Drilled Size | 0.075mm(3nil) |
Min mechanical Drilled Size | 0.15mm(6mil) |
Aspect Ratio for laser hole | 0.9:1 |
Aspect Ratio for through hole | 16:1 |
Surface Finish | HASL, Lead free HASL,ENIG,Immersion Tin, OSP, Immersion Silver, Gold Finger, Electroplating Hard Gold, Selective OSP,ENEPIG.etc. |
Via Fill Option | The via is plated and filled with either conductive or non-conductive epoxy then capped and plated over |
Copper filled, silver filled | |
Laser via copper plated shut | |
Registration | ±4mil |
Solder Mask | Green, Red, Yellow, Blue, White, Black, Purple, Matte Black, Matte
green.etc. |
layer/m² | S<1㎡ | S<3㎡ | S<6㎡ | S<10㎡ | S<13㎡ | S<16㎡ | S<20㎡ | S<30㎡ | S<40㎡ | S<50㎡ | S<65㎡ | S<85㎡ | S<100㎡ |
1L | 4wds | 6wds | 7wds | 7wds | 9wds | 9wds | 10wds | 10wds | 10wds | 12wds | 14wds | 15wds | 16wds |
2L | 4wds | 6wds | 9wds | 9wds | 11wds | 12wds | 13wds | 13wds | 15wds | 15wds | 15wds | 15wds | 18wds |
4L | 6wds | 8wds | 12wds | 12wds | 14wds | 14wds | 14wds | 14wds | 15wds | 20wds | 25wds | 25wds | 28wds |
6L | 7wds | 9wds | 13wds | 13wds | 17wds | 18wds | 20wds | 22wds | 24wds | 25wds | 26wds | 28wds | 30wds |
8L | 9wds | 12wds | 15wds | 18wds | 20wds | 20wds | 22wds | 24wds | 26wds | 27wds | 28wds | 30wds | 30wds |
10L | 10wds | 13wds | 17wds | 18wds | 20wds | 20wds | 22wds | 24wds | 26wds | 27wds | 28wds | 30wds | 30wds |
12L | 10wds | 15wds | 17wds | 18wds | 20wds | 20wds | 22wds | 24wds | 26wds | 27wds | 28wds | 30wds | 30wds |
14L | 10wds | 16wds | 17wds | 18wds | 20wds | 20wds | 22wds | 24wds | 26wds | 27wds | 28wds | 30wds | 30wds |
16L | 10wds | 16wds | 17wds | 18wds | 20wds | 20wds | 22wds | 24wds | 26wds | 27wds | 28wds | 30wds | 30wds |