Izixhobo zokuvelisa ze-SMT zizenzekelayo ngokupheleleyo, zichanekile phezulu, isantya esiphezulu, ukusebenza kakuhle njalo njalo. PCB uyilo kufuneka luhlangabezane neemfuno zezixhobo zeSMT. Iimfuno zoyilo lwezixhobo zemveliso ze-SMT zibandakanya: imilo ye-PCB, ubungakanani, umngxuma wokubekwa kunye nokubethelelwa komphetho, uMarko wesalathiso, ibhodi yokuhlanganisa, ukhetho lwecandelo lokupakisha kunye nefom yokupakisha, ifayile yemveliso yePCB, njl.

Xa kuyilwa PCB, imilo PCB kufuneka kuthathelwe ingqalelo kuqala. When Ubungakanani be-PCB bukhulu kakhulu, umgca oprintiweyo mde, ukunyuka kwesantya, amandla okulwa nengxolo ayancipha, kwaye iindleko ziyanda. Incinci kakhulu, ukusasazeka kobushushu akulunganga, kwaye imigca ekufutshane inokuthi iphazamiseke. Kwangelo xesha, ukuchaneka kunye nokubalulwa kobume bemilo ye-PCB kuchaphazela ngokuthe ngqo ukuveliswa kunye noqoqosho lwemveliso kunye nokusebenza. Umxholo iphambili uyilo imilo PCB imi ngolu hlobo lulandelayo.

(1) Uyilo lobubanzi lobubanzi-ububanzi

Ubume bebhodi eprintiweyo kufuneka bube lula ngangokunokwenzeka, ngokubanzi uxande, ubude ukuya kububanzi be-3: 2 okanye 4: 3, ubungakanani bayo kufanele ukuba busondele kubungakanani boluhlu oluqhelekileyo, ukuze kube lula ukuqhubekeka nobugcisa, ukunciphisa iindleko zokuqhubekeka. Umphezulu webhodi akufuneki uyile ube mkhulu kakhulu, ukuze ungabangeli deformation xa ugcwalisa iwelding. Ubungakanani kunye nezinyuko zebhodi kufuneka zingqinelane, i-PCB encinci, ubungakanani bebhodi akufuneki bube bukhulu kakhulu.

Zithini iimfuno zoyilo lwe-PCB yezixhobo zemveliso ze-SMT

(2) imilo PCB

Imilo yePCB kunye nobukhulu bayo zichongwa yimowudi yokuhanjiswa kwePCB kunye noluhlu olwandayo lomatshini wokunyusa.

Xa i-PCB ibekwe kwibhentshi ekhwele kwaye idluliselwe kwibhentshi, akukho mfuneko ikhethekileyo yokubonakala kwe-PCB.

The Xa i-PCB idluliselwa ngokungqalileyo ngololiwe, imilo ye-PCB kufuneka ithe tye. Ukuba yiPCB ebonisiweyo, umda wenkqubo kufuneka uyilelwe ukuze umphandle wePCB wenze umgca othe ngqo, njengoko kubonisiwe kumzobo 5-80.

Umzobo 5-81 ubonisa i-PCB iikona ezijikeleziweyo okanye i-45. Umzobo weChamfering. Kuyilo lobume be-PCB, kungcono ukucwangcisa i-PCB kwiikona ezijikeleziweyo okanye i-45. I-Chamfer yokuthintela ukonakala kwe-Angle ebukhali kwibhanti yokuhambisa ye-PCB (ibhanti yefayibha).

(3) uyilo ubungakanani PCB

Ubungakanani bePCB bumiselwe kukwanda koluhlu. Xa uyila i-PCB, kufuneka uqwalasele ubuninzi kunye nobukhulu obuncinci bokunyuka komatshini wokunyusa. Ubungakanani obuphezulu bePCB = ubungakanani obukhulu bokunyuka komatshini; Ubuncinci bePCB = ubungakanani obuncinci bokunyuka komatshini wokufaka. Uluhlu lokumiliselwa kweentlobo ezahlukeneyo zoomatshini bokufaka lahlukile. Xa ubungakanani bePCB bincinci kunobuncinci bobungakanani bokunyuka, ibhodi kufuneka isetyenziswe.

(4) uyilo ubukhulu PCB

Ngokubanzi, ubukhulu beplate obuvunyelwe ngumatshini wokunyuka ngu-0.5 ~ Smm. Ukutyeba kwe-PCB ngokubanzi kuluhlu lwe-0.5-2mm.

Assemb Hlanganisa kuphela iisekethi ezihlanganisiweyo, ii-transistors ezinamandla aphantsi, ii-resistors, ii-capacitors kunye nezinye izinto ezinamandla aphantsi, xa kungekho meko yokungcangcazela yomthwalo, ubungakanani be-PCB ngaphakathi kwe-500mmx500mm, ukusetyenziswa kobukhulu be-1.6mm.

② Phantsi kwimeko yokungcangcazela komthwalo, ubungakanani beplate bunokuncitshiswa okanye indawo yokuxhasa inokuqiniswa okanye inyuswe, kwaye ubukhulu be-1.6mm busenokusetyenziswa.

③ Xa umphezulu wepleyiti umkhulu okanye ungakwazi ukuxhasa, kufuneka kukhethwe ipleyiti eshinyeneyo engama-2-3mm.