18
Figure 6:Cooling too much/little
When the final temperature profile is as close as possible to the desired profile, tke
record or store of the parameters for later use. Although this process is slow and
laborious at first, it can eventually gain proficiency experience, resulting in high-
efficiency production of high-quality PCBs.
6. Temperature profile setting method
♦Set the temperature of each zone and the speed of the conveyor chain from the initial
value. For cold oven, preheat for ~30 minutes.
♦After the preheating is completed, let the PCB go through the heating soldering
system. If soldering does not occur, the conveyor chain speed can be appropriately
reduced. Or on the premise of not changing the transmission chain speed,increase the
set temperature appropriately, and pay attention to not exceeding the bearing capacity
of the PCB and components when adjusting the set temperature.
♦Let the PCB go through the new conveyor chain under new speed or the adjusted set
temperature,if no soldering occurs,then do the adjustment of the previous step,
otherwise proceed to the next step to fine-tune the temperature profile.
♦The temperature profile can be adjusted appropriately according to the complexity of
the PCB.Can reduce the speed of the conveyor chain and increase the soldering time;
on the contrary, add the speed of the conveyor chain will reduce the soldering time.
♦Generally, when the PCB with components mounted on passes through the soldering
system but is not completely slodered, it can be properly adjusted and then put into the
soldering system for soldering again. Generally, it won’t effect on the PCB and
components.
♦The temperature setting is generally from low to high. If the soldering temperature
range exceeds the set temperature much, should increase the speed of the conveyor
chain or reduce the set temperature.
♦Different PCB boards have different heat transfer rates and heat absorption, then the
heating time and temperature required by soldering are also different. For double-layer
boards and multilayer boards and PCBs with more areas and pads, the setting
temperature is relatively higher , And for single-sided boards or paper plastic boards or
Содержание IN12
Страница 6: ...5 3 Main Parts 3 1 Reflow Oven Main Body 3 2 Operating Panel...
Страница 7: ...6 3 3 Cover and Heating Zone 3 31 Heating Zone...
Страница 18: ...17 Figure 4 Set too high low temperature of active zone Figure 5 Soldering too much little...
Страница 24: ...23 Regularly add high temperature lubricating oil to transfer chain bearings...