Yintoni iluphu

Iringi ligama lobuchwephesha lendawo ephakathi komngxuma ogrunjiweyo kumngxuma wokutyhutyha kunye nomda wephedi yokuqhuba. Imingxunya yokutyhutyha isebenze njengeendawo zoqhagamshelo phakathi kweemaleko ezahlukeneyo kwi PCB.

Ukuze uqonde iziseko zamakhonkco e-annular, kufuneka ukwazi ukwakha imingxuma. Kwimveliso yePCB, iPCB iyabhalwa kwaye isuswe ngeepads ezilungelelaniswe enye kwenye kwiileya ezahlukeneyo. Gqoka imingxuma ukwenza umngxuma kwaye ubeke ubhedu eludongeni nge-electroplating.

Xa ujonga i-PCB ukusuka phezulu, ukugrunjwa kwemingxuma kubonisa ipateni esetyhula. Zibizwa ngokuba ngamakhonkco. Ubungakanani beringi buhlukile. Abanye abayili bePCB bakhethe ukusebenzisa iilophu ezishinyeneyo, ngelixa abanye babela iilophu ezibhityileyo ngenxa yemiqobo yendawo.

Ubungakanani beringi bubalwa ngolu hlobo lulandelayo.

Ubungakanani bendandatho = (i-diameter ye-backing plate-diameter ye-drill bit) / 2

Umzekelo, ukugrumba umngxuma we-10 mil kwi-25 mil pad kuya kuvelisa i-ring 7.5 mil.

Iingxaki eziqhelekileyo ngeelophu

Kuba imingxunya iyinxalenye ebalulekileyo yokwenziwa kwePCB, kuhlala kucingelwa ukuba iilophu azinampazamo. Le yingcamango ephosakeleyo. Ukuba kukho ingxaki nge-loop, inokuchaphazela ukuqhubeka komkhondo.

Ngokwethiyori, iringi egqibeleleyo yenziwa ngokugrumba umngxuma kumbindi wepadi yokutyhutyha. Ngokwesiqhelo, ukuchaneka kokomba kuxhomekeke kumatshini osetyenziswa ngumenzi wePCB. Abavelisi be-PCB banonyamezelo oluthile lweringi, ngokuqhelekileyo malunga ne-5 mils. Ngamanye amazwi, umngxuma wokutsala amanzi unokuphambuka kwindawo ephawulweyo phakathi koluhlu olunikiweyo.

Xa i-bit ingahambelani nophawu, umngxuma ophumelayo uya kujongana necala lepadi. I-annular tangents ibonakala xa inxalenye yomngxuma ichukumisa umda we-pad. Ukuba umngxuma wokutsala amanzi uyaphambuka ngakumbi, ukuvuza kunokwenzeka. Ukuvuza kuxa inxenye yomngxuma idlula indawo egcwalisiweyo.

I-annular fracture inokuchaphazela ukuqhubeka komngxuma wokutyhutyha. Xa indawo yobhedu yomngxuma wokudibanisa kunye ne-pad incinci, ikhoyo ngoku iya kuchaphazeleka. Le ngxaki ibonakala ngakumbi xa amajelo achaphazelekayo asetyenziselwa ukuhambisa ngakumbi ngoku. Xa ikhefu leringi lifunyenwe, isithako sobhedu esingaphezulu sihlala sidityaniswa malunga nendawo evelileyo ukuyibamba.

Kwezinye iimeko, kunokubangela iingxaki ezingenakulungiseka. Ukuba umngxuma ucinywe ngendlela egqobhoza iingcingo ezikufutshane, iPCB iya kuba mfutshane ngempazamo. Le ngxaki inzima ukuyicombulula kuba ibandakanya ukuhlukaniswa ngokwasemzimbeni ngemingxunya kunye neentambo ezimfutshane zesekethe.

Ulungelelwaniso lwesayizi yeringi oluchanekileyo

Ngelixa abavelisi bePCB banoxanduva lokuvelisa iilophu ezichanekileyo, abayili banokudlala indima ekubekeni uyilo kubungakanani obufanelekileyo. Vumela indawo engaphezulu ngaphandle koluhlu lonyamezelo oluxeliweyo lomenzi. Ukwabela i-1 mil eyongezelelweyo kubungakanani belophu kuya kukugcina ingxaki yokudubula kamva.