PCB Mounting Holes: Ho utloisisa Counterbore le Countersink

Li-PCB ke likarolo tse rarahaneng tsa elektroniki tse nang le likarolo tse fapaneng tse amang chebahalo ea tsona ea 'mele le tšebetso ea tsona. Leha lintlha tse kang layer count le substrate material li atisa ho hatisoa, moralo oa likoti tsa screw o bohlokoa ka mokhoa o ts'oanang. Li-PCB tse ling li hloka masoba a screw bakeng sa ho hokela, 'me mokhoa o sebelisoang ho phunya masoba ana o ka ama ts'ebetso ea boto haholo. Mekhoa e 'meli ea mantlha ea ho cheka masoba a screw ho PCBs ke counterbore le countersink, e' ngoe le e 'ngoe e sebeletsa merero e fapaneng ho latela mofuta oa screw e sebelisitsoeng.

Ho utloisisa Counterbore Holes

Sekoti se entsoeng ka counterbored ke lesoba la cylindrical le kentsoeng ka holim'a PCB ho kenya sekoti sa sokete se nang le hlooho e chitja. Mofuta ona oa lesoba o fana ka sebaka se sireletsehileng bakeng sa screw, ho etsa bonnete ba hore e lutse ka holim'a boto. Leha li-socket cap screws li sebelisoa hangata ka masoba a counterbore, ho bohlokoa ho nahana hore na mofuta ona oa screw o loketse litlhoko tsa hau tse ikhethileng tsa PCB.

Bakeng sa liqeto tse amanang le tlhahiso, Highleap e boetse e tlaleha litlhoko tsa ho koahela kopano le liteko tsa ts'ebetso ea PCBA , tse ka thusang ho thibela lintlha tse sa hlakang ka har'a sephutheloana sa khotheishene.

Ho hlahloba likoti tsa Countersink

Ho fapana le likoti tsa counterbore, likoti tsa countersink li na le sebopeho sa conical. Ho phunya masoba ana ho hloka ho nepahala ho etsa sebaka sa phomolo se bōpehileng joaloka khoune se lumellang sekoti sa hlooho se bataletseng hore se lule se le holim'a boto. Moralo ona o tiisa boto e boreleli, e leng molemo ka ho khetheha bakeng sa ho boloka bots'epehi ba moralo oa PCB ka kakaretso.

Phapang lipakeng tsa Countersink le Counterbore Holes

Khetho pakeng tsa likoti tsa countersink le counterbore ho itšetlehile ka lintlha tse fapaneng, ho kenyelletsa le mofuta oa screw le litlhoko tsa kopo. Likoti tsa counterbore li bonolo ho phunya, kaha li otlolohile, ha likoti tsa countersink li hloka sebaka se itseng sa kamore bakeng sa screw headhead - hangata 82-degree, 90-degree, kapa 100-degree.

Likoti tsa li-countersink li fana ka maemo a bonolo haholoanyane, li amohela li-screw tsa hlooho tse bataletseng tse nang le hex hole kapa notch ea setso e sephara ea screwdriver. Haeba ho boloka sebaka le ho feto-fetoha ha maemo e le lintho tse tlang pele, likoti tsa countersink hangata lia khethoa, kaha li lumella ho lekana ha li-screw, ho nolofalletsa PCB ho kenya lisebelisoa tse nang le sebaka se fokolang.

Ka lehlakoreng le leng, haeba ho hlongoa ka mokhoa o sireletsehileng ho le bohlokoa 'me ho feta mathata a ho boloka sebaka kapa boreleli ba holim'a metsi, likoti tsa counterbore ke khetho e ntle. Tšebeliso ea li-socket screws ka mekoting ea counterbore e fana ka sebaka se sireletsehileng haholoanyane bakeng sa PCB.

Ho Khetha Bit e nepahetseng ea ho Drill bakeng sa Counterbore le Countersink Holes

Ho khetha karolo e nepahetseng ea ho phunya ho bohlokoa bakeng sa ho fihlela likoti tse nepahetseng tsa li-counterbore le li-countersink ho li-PCB. Bakeng sa masoba a counterbore, ho sebelisa tšepe ea lebelo le phahameng (HSS) e nang le ntlha e bataletseng ho netefatsa hore ho etsoa lesoba le hloekileng la cylindrical le tsamaisanang le litekanyo tsa screw. Likotoana tsena li etselitsoe ho sebetsana le lisebelisoa tse thata tse sebelisoang hangata ho li-PCB, joalo ka li-fiberglass-reinforced epoxy laminates.

Bakeng sa masoba a countersink, sekoti sa countersink se nang le angle e loketseng (hangata 82 degrees, 90 degrees, kapa 100 degrees) ke ea bohlokoa. The angle e tlameha ho ts'oana le angle ea hlooho ea screw ho netefatsa ho lekana. Ho sebelisa likotoana tsa li-countersink tse nang le likarolo tsa carbide ho ka ntlafatsa ho nepahala le ho phela nako e telele, haholo-holo ha ho sebetsa ka thepa e senyang.

Litlhokomelo tsa Tsamaiso ea Mocheso bakeng sa Likoti tse Chekiloeng

Ha ho tjhekwa masoba a counterbore le a countersink ho di-PCB, taolo ya mocheso ke ntlha ya bohlokwa eo ho lokelang ho nahanelwa ka yona. Tshebetso ya ho tjheka e hlahisa mocheso, e leng se ka amang botshepehi ba thepa ya PCB . Ho futhumatsa ho feta tekano ho ka baka karohano kapa ho petsoha, haholoholo dibotong tse nang le mealo e mengata.

Ho fokotsa mathata a amanang le mocheso, ho bohlokoa ho sebelisa mekhoa e nepahetseng ea ho pholisa, joalo ka moea kapa mokelikeli o pholileng, nakong ea ho cheka. Ho feta moo, ho khetha likotoana tsa ho cheka tse nang le liaparo tse kang titanium nitride (TiN) ho ka fokotsa khohlano le ho hlahisa mocheso. Ho boloka lebelo le nepahetseng la ho cheka le sekhahla sa phepelo ho boetse ho thusa ho fokotsa tšenyo ea mocheso, ho netefatsa ho tšoarella le ts'ebetso ea PCB.

Mehopolo ea Tlhahiso

Bakeng sa ho tjheka masoba a nang le borokho bo fapaneng, tshebetso ena e bonolo haholo, e hlokang tsebo ya boholo ba dikurufu le botebo ba ho tjheka. Ho lokela ho nahanelwa ka ho tjheka, le hoja masoba a nang le borokho bo fapaneng hangata a sa tjheke.

Ka lehlakoreng le leng, ho cheka masoba a countersink ho hloka tekanyo e hlokolosi ea 'mele oa screw le angle ea kamore ho latela boholo ba screw. Mehaho ea ho pola le eona e bohlokoa bakeng sa masoba a countersink haeba ho hlokahala plating.

Ka kakaretso, ho utloisisa phapang pakeng tsa masoba a counterbore le a countersink ho bohlokoa bakeng sa baqapi le bahlahisi ba PCB. Masoba ana a bapala karolo ea bohlokoa ho netefatseng hore ho kenngoa likarolo ho sebetsa hantle le ho tiisoa ka thata ha li-PCB. Ka ho khetha mofuta o nepahetseng oa masoba ho latela litlhoko tse ikhethileng tsa ts'ebeliso, baqapi ba ka ntlafatsa ts'ebetso le botle ba likarolo tsa PCB.