Dangantaka tsakanin faɗin alamar alama da na yanzu a ciki PCB zane

Wannan matsala ce da ta sa mutane da yawa suna fama da ciwon kai. Na sami wasu bayanai daga Intanet na tsara su kamar haka. Muna bukatar mu san cewa kauri na jan karfe 0.5oz (kimanin 18μm), 1oz (kimanin 35μm), 2oz (kimanin 70μm) jan karfe, 3oz (kimanin 105μm) da sama.

1. Online Forms

Ƙimar ɗaukar nauyi da aka jera a cikin bayanan tebur ita ce matsakaicin ƙimar ɗaukar nauyi na yanzu a yanayin zafi na al’ada na digiri 25. Don haka, abubuwa daban-daban kamar mahalli daban-daban, hanyoyin masana’antu, tsarin faranti, da ingancin faranti dole ne a yi la’akari da ainihin ƙira. Saboda haka, ana ba da tebur ne kawai azaman ƙimar tunani.

2. Ana nuna ƙarfin ɗaukar nauyi na tagulla mai kauri daban-daban da faɗi a cikin tebur mai zuwa:

Lura: Lokacin amfani da jan ƙarfe azaman jagora don wuce manyan igiyoyin ruwa, ƙarfin ɗaukar halin yanzu na faɗin tagulla yakamata a lalata shi da 50% tare da la’akari da ƙimar da ke cikin tebur don la’akarin zaɓi.

3. A dangantaka tsakanin jan karfe tsare kauri, gano nisa da halin yanzu a PCB zane

Bukatar sanin abin da ake kira hawan zafin jiki: ana haifar da tasirin dumama na yanzu bayan da mai gudanarwa ya gudana. Yayin da lokaci ya wuce, zazzabi na saman madubin yana ci gaba da tashi har sai ya daidaita. Tsayayyen yanayin shine bambancin zafin jiki kafin da bayan a cikin sa’o’i 3 baya wuce 2 ° C. A wannan lokacin, ma’aunin zafin jiki na saman madubi shine zafin jiki na ƙarshe na mai gudanarwa, kuma naúrar zafin jiki shine digiri (°C). Bangaren tashin zafin da ya zarce zafin iskar da ke kewaye (zazzabi na yanayi) ana kiransa zafin zafi, kuma sashin haɓakar zafin jiki shine Kelvin (K). A cikin wasu labarai da rahotannin gwaji da tambayoyin gwaji game da hawan zafin jiki, ana yawan rubuta naúrar tashin zafin a matsayin (℃), kuma bai dace a yi amfani da digiri (℃) don bayyana tashin zafin ba.

Abubuwan da ake amfani da su na PCB yawanci kayan FR-4 ne. Ƙarfin mannewa da zafin aiki na foil ɗin jan ƙarfe yana da girma. Gabaɗaya, zafin da aka yarda da PCB shine 260 ℃, amma ainihin zafin jiki na PCB bai kamata ya wuce 150 ℃ ba, saboda idan ya zarce wannan zafin yana kusa da wurin narkewa na solder (183°C). A lokaci guda kuma, yakamata a yi la’akari da yanayin zafin da aka yarda da shi na abubuwan da ke cikin jirgin. Gabaɗaya, ICs-aji na farar hula na iya jure madaidaicin 70°C, ICs-aji masana’antu sune 85°C, kuma ICs-aji na soja na iya jure matsakaicin 125°C kawai. Sabili da haka, zazzabi na foil na jan karfe kusa da IC akan PCB tare da farar hula ICs yana buƙatar sarrafawa a ƙaramin matakin. Na’urori masu ƙarfi ne kawai tare da juriya mafi girma (125 ℃～ 175 ℃) ana iya barin su zama mafi girma. Zazzabi na PCB, amma tasirin babban zafin jiki na PCB akan zafin na’urorin wuta shima yana buƙatar la’akari.