Ọkachamara SMT Ngwọta Na-eweta

Dozie ajụjụ ọ bụla ị nwere gbasara SMT
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Profaịlụ mweghachi na-enweghị ndu: Ụdị nfe vs. Ụdị Slumping

Profaịlụ mweghachi na-enweghị ndu: Ụdị nfe vs. Ụdị Slumping

Nrụgharị reflow bụ usoro nke na-esi na tapawa solder kpụ ọkụ n'ọnụ wee gbanwee gaa n'ala gbazere ka ijikọ ihe atụdo na paịlị PCB ọnụ kpamkpam.

Enwere nzọụkwụ/mpaghara anọ na usoro a - preheating, teta, reflow na jụrụ oyi.

N'ihi na omenala trapezoidal ụdị profaịlụ ndabere na lead free solder mado nke Bittele na-eji maka SMT mgbakọ usoro:

  1. Mpaghara na-ekpo ọkụ: Preheat na-ezokarị aka ịbawanye okpomọkụ site na okpomọkụ nkịtị ruo 150 ° C na site na 150 Celsius ruo 180 C. Igwe ọkụ na-ekpo ọkụ site na nkịtị ruo 150 ° C bụ ihe na-erughị 5 ° C / sec (na 1.5 ° C ~ 3). Celsius C / sk), na oge n'etiti 150 ° C na 180 Celsius C dị gburugburu 60 ~ 220 sec.Uru nke ikpo ọkụ na-adị nwayọọ bụ ikwe ka ihe mgbaze na mmiri dị na vapo paste pụta n'oge.Ọ na-emekwa ka nnukwu ihe mejupụtara ya na-ekpo ọkụ mgbe niile na obere ihe ndị ọzọ.
  2. Mpaghara ime mmiri: A na-akpọ oge ikpo ọkụ site na 150 Celsius C ruo ebe a wụrụ awụ alloy dị ka oge ịcha mmiri, nke pụtara na flux na-arụ ọrụ ma na-ewepụ ihe mgbakwunye oxidized n'elu igwe ka ọ dị njikere ịme ezigbo nkwonkwo solder. n'etiti ntụtụ components na PCB pads.
  3. Mpaghara nlọghachi azụ: Mpaghara nkwụghachi, nke a na-akpọkwa "oge n'elu liquidus" (TAL), bụ akụkụ nke usoro ebe a na-enweta okpomọkụ kachasị elu.Okpomọkụ kachasị elu bụ 20-40 Celsius C karịa mmiri mmiri.
  4. Mpaghara jụrụ oyi: Na mpaghara jụrụ oyi, okpomọkụ na-eji nwayọọ nwayọọ na-ebelata ma na-eme nkwonkwo solder siri ike.Ọ dị mkpa ka echebara mkpọda mkpọda jụrụ oyi kacha mma iji zere ntụpọ ọ bụla ghara ime.A na-atụ aro ọnụego jụrụ oyi nke 4 Celsius C/s.

Enwere profaịlụ abụọ dị iche iche na-etinye aka na usoro nlọghachi - ụdị ncha na ụdị slumping.

Ụdị Soaking yiri ọdịdị trapezoidal ebe ụdị slumping nwere ọdịdị delta.Ọ bụrụ na bọọdụ ahụ dị mfe na enweghị ihe mgbagwoju anya dị ka BGA ma ọ bụ nnukwu ihe dị na bọọdụ ahụ, profaịlụ ụdị slumping ga-akacha mma.

reflow soldering

 


Oge nzipu: Jul-07-2022