Momwe Novices Amagwiritsira Ntchito Mavuni Otsitsimula

Mavuni obweranso amagwiritsidwa ntchito popanga Surface Mount Technology (SMT) kapena njira zopangira ma semiconductor.Nthawi zambiri, ma ovuni obweranso ndi gawo la chingwe chamagetsi, kuphatikiza makina osindikizira ndi oyika.Makina osindikizira amasindikiza phala la solder pa PCB, ndipo makina oyika amayika zigawo pa phala losindikizidwa.

Kupanga Reflow Solder Pot

Kupanga uvuni wa reflow kumafuna kudziwa za solder phala lomwe limagwiritsidwa ntchito pamsonkhano.Kodi matope amafunikira malo okhala ndi nayitrogeni (otsika okosijeni) panthawi yotentha?Mafotokozedwe a reflow, kuphatikiza kutentha kwambiri, nthawi yopitilira liquidus (TAL), ndi zina?Izi zikadziwika bwino, wopanga makinawo atha kugwira ntchito kuti akhazikitse chophimba cha uvuni wa reflow ndi cholinga chokwaniritsa mbiri inayake.Chinsinsi cha uvuni wa reflow chimatanthawuza kusinthasintha kwa kutentha kwa uvuni, kuphatikizapo kutentha kwa madera, ma convection rates, ndi gasi.Mbiri ya reflow ndi kutentha komwe bolodi "imawona" panthawi yobwezeretsanso.Pali zinthu zambiri zomwe muyenera kuziganizira popanga njira yobwezeretsanso.Kodi board board ndi yayikulu bwanji?Kodi pali zinthu zing'onozing'ono pa bolodi zomwe zitha kuonongeka chifukwa cha convection yayikulu?Kodi malire a kutentha kwa zigawo zikuluzikulu ndi ziti?Kodi pali vuto ndi kuchuluka kwa kutentha kwachangu?Kodi mbiri yomwe mukufuna ndi yotani?

Mawonekedwe ndi Mawonekedwe a Reflow Oven

Mavuni ambiri a reflow ali ndi pulogalamu yopangira zopangira zodziwikiratu zomwe zimalola kuti reflow solder ipange njira yoyambira yotengera mawonekedwe a bolodi ndi mafotokozedwe a solder phala.Unikaninso reflow soldering pogwiritsa ntchito chojambulira chotenthetsera kapena waya wotsatira wa thermocouple.Reflow setpoints akhoza kusinthidwa mmwamba / pansi potengera mbiri yeniyeni ya kutentha vs. solder paste specifications ndi bolodi / chigawo cholepheretsa kutentha.Popanda maphikidwe opangira maphikidwe, mainjiniya amatha kugwiritsa ntchito mbiri ya reflow yokhazikika ndikusintha maphikidwe kuti ayang'ane ndondomekoyi posanthula.