PCB joylashishni aniqlash teshigi – bu PCBning teshik orqali joylashishini aniqlash uchun PCB dizayn jarayonida juda muhim bo’g’in. The role of the positioning hole is printed circuit board manufacturing processing benchmark. PCB positioning hole positioning methods are various, mainly according to different positioning accuracy requirements. Bosilgan elektron platalarda joylashgan teshiklar maxsus grafik belgilar bilan ifodalanishi kerak. When the requirements are not high, the larger assembly hole in the printed circuit board can be used instead.

Bosilgan elektron kartochkalarni burg’ulash va frezalash shaklidagi qattiq taxtani, shuningdek qulay onlayn testlarni osonlashtirish uchun, ko’plab elektron kartochkalar ishlab chiqaruvchilari foydalanuvchilarga PCBda uchta metall bo’lmagan teshiklarni loyihalashga umid qiladilar, joylashish teshiklari odatda metall bo’lmagan teshiklarga, diametri mm. yoki mm. Agar taxta qattiq bo’lsa, smmo, kamida ikkita joylashtiruvchi teshikni qo’yish va diagonal qilib qo’yish kerak. If you make a jigsaw board, you can also think of the jigsaw board as a PCB, the whole jigsaw board as long as there are three positioning holes. Agar foydalanuvchi joylashtirmasa, elektron kartani ishlab chiqaruvchi avtomatik ravishda chiziqqa ta’sir qilmasligini qo’shadi yoki taxtada mavjud bo’lmagan metall bo’lmagan teshiklarni joylashuv teshiklari sifatida ishlatadi.

Teshikni joylashtirish usuli

Device hole Interface devices and connectors are mostly plug-in components. Qo’shish moslamasining teshik diametri 8 ~ 20 milya diametridan kattaroqdir va payvandlash paytida qalayning kirib borishi yaxshi bo’ladi. Ta’kidlash joizki, elektron kartochka zavodining diafragmasida xato bor va taxminiy xato ± 0.05 mm. 0.05 mm – har bir intervalda, 0 mm – har bir oraliqda, agar diametri 3.20 mm dan yuqori bo’lsa, – bu bir xil matkap. Shuning uchun, qurilmaning diafragmani loyihalashda, birlik millimetrga aylantirilishi kerak, va diafragma 0.05 ga teng bo’lgan butun sonli son sifatida tuzilishi kerak. Plitalar zavodi, foydalanuvchi tomonidan berilgan burg’ulash ma’lumotlariga ko’ra, burg’ulash asboblari hajmini o’rnatadi. Burg’ulash asbobining o’lchami, odatda, foydalanuvchi tomonidan talab qilinadigan shakllantirish teshigidan 0.1 ~ 0.15 kattaroqdir. Mmo dizaynining diametri kichik emas, balki katta bo’lishi kerak va bardoshlik talabi ham kichik emas, balki katta bo’lishi kerak. If it is a crimping device, the aperture should not be increased, according to the data recommended design, and in the instructions to explain what is crimping device, so that the circuit board manufacturer can try to control the error in the process of making the board, to avoid some unnecessary trouble.

Burg’ulash turlari metalllashtirilgan va metall bo’lmagan teshiklarga bo’linadi. Metallashtirilgan teshik devorida cho’kindi mis bor, u o’tkazuvchi rol o’ynashi mumkin va PTH bilan ifodalanadi. There is no copper in the hole wall of the nonmetallic hole, so it cannot conduct electricity. It is indicated by NPTH. Tashqi diametri va metalllashtirilgan teshik diametrining ichki diametri orasidagi farq 20 milldan katta bo’lishi kerak, aks holda yostiqning payvandlash halqasi ishlov berish uchun juda kichik va payvandlash uchun qulay emas. Agar shartlar ruxsat bersa, diafragma yostiqning radiusi qilib tuzilishi mumkin. Metalllashtirilgan teshikning maksimal teshik diametri 6.35 mm, metall bo’lmagan teshikning maksimal diametri 6.5 mm. Metalllashtirilgan teshik kontur chizig’ida ishlab chiqilmasligi kerak. Teshik chetlari kontur chizig’idan 1 mm dan uzoqroq bo’lishi kerak. Cobalt hole heavy hole easily damage the drill, so should be avoided as much as possible. Payvandlashsiz va metall bo’lmagan metall tuynuksiz, teshikni metall bo’lmagan payvandlash plastinkasining o’ziga xos xususiyati sifatida loyihalash mumkin, uni chizish yoki mis folga qilish shart emas, shakli bo’yicha kamida 1 mm burg’ulash teshigining chekka masofasini dumaloq teshikka bo’lish mumkin. va to’rtburchaklar teshik, dumaloq teshik uchun oddiy burg’ulash, to’rtburchaklar teshik ko’p marta burg’ulash bilan belgilangan tartibda kesilgan, shuning uchun to’rtburchaklar teshikning eng yaxshi o’sishi kengligidan ikki baravar ko’p, Va kengligi 0.8 mm dan kam emas, to’rtburchaklar teshiklarni loyihalash uchun iloji boricha kamroq.

PCB positioning hole requirements:

The development of PCB design industry has become mature, so the requirements for PCB positioning holes are also very perfect. Joylashtirish teshiklari quyidagi talablarga javob berishi kerak.

1. Install at least two positioning holes on the diagonal of the board.

2. The standard aperture of the positioning hole is 3.2mm _+0.05mm.

3, korporativ shponning turli xil mahsulotlari uchun quyidagi afzal qilingan diafragmani ishlatishi mumkin: 2.8mm ± 0.05mm, 3.0mm ± 0.5mm, 3.5mm ± 0.5mm va 4.5mm ± 05mm. Xuddi shu mahsulotning turli xil taxtalari uchun (masalan, DX taxtasi va ZXJlO PP taxtasi), agar tenglikni o’lchamlari bir xil bo’lsa, joylashtirish teshiklari bir xil bo’lishi kerak.

4. The positioning hole is a light hole, that is, a nonmetallic through hole (except rf board).

5. If the existing mounting holes (except the buckle mounting holes) meet the above requirements, there is no need to set another positioning hole.

Some common specifications and precision requirements for positioning holes:

1. O’rnatish teshigining diametri xato diapazoni odatda 0.01 mm ichida. Agar xato PCB ishlab chiqarish xonasida katta bo’lsa, bu probning yomon aloqa qilishiga va interfeys ulagichining avtomatik joylashtiruvchi mexanizmga noaniq joylashishiga olib keladi.

2, joylashishni aniqlash teshigiga qo’yiladigan talablar diametri: 3 mm dan past bo’lishga harakat qiling, shunda joylashishni aniqlash ustuni deformatsiyalanmaydi, ishlash uchun juda katta va noqulay bo’ladi.

3, joylashishni aniqlash teshigi PCB tarmoq masofasi: 1MM dan ortiq, shuning uchun o’rnatish jarayoni qisqa tutashuvga oson emas, shuningdek, mahsulot yo’nalishiga zarar etkazmaydi.

4, the type of positioning hole: positioning hole is generally the need for mechanical control of unsinkable copper, so that it can not be connected with the circuit on the board and higher accuracy.

5, positioning bladder layout: need to be in the PCBA four corners or diagonal, so as to form a multi-point plane positioning, positioning accuracy, the farther the better.

6, testda noto’g’ri qisqa tutashuvni oldini olish uchun, joylashishni aniqlash teshigi va sinov nuqtasi orasidagi masofa kamida 2 mm bo’lishi kerak.

7. Joylashtiruvchi teshik va plastinkaning chetlari orasidagi masofa kamida 2 mm ni tashkil qiladi, bu esa PCBA mustahkamligini ta’minlashda yorilish oson emas.