Mīkini paʻi paʻi solder He mea koʻikoʻi ia ma ka ʻaoʻao mua o ka laina SMT, me ka hoʻohana nui ʻana i ka stencil e paʻi i ka paʻi solder ma ka pad i kuhikuhi ʻia, ka paʻi paʻi solder maikaʻi a maikaʻi ʻole paha, pili pono i ka maikaʻi solder hope.Ma lalo iho nei e wehewehe i ka ʻike loea o ka mīkini paʻi kaʻina hana hoʻonohonoho ʻāpana.
1. Pumi squeegee.
Pono ke kaomi squeegee e pili ana i nā koi huahana maoli.ʻAʻole liʻiliʻi ka paʻi, ʻelua paha mau kūlana: ʻo ka squeegee i ke kaʻina hana o ka neʻe ʻana i lalo he liʻiliʻi nō hoʻi, e hoʻopiʻi i ka leakage o ka nui o ka paʻi ʻole;ʻO ka lua, ʻaʻole kokoke ka squeegee i ka ʻili o ka stencil, paʻi ʻia ma muli o ke ʻano o kahi āpau liʻiliʻi ma waena o ka squeegee a me PCB, e hoʻonui ana i ka mānoanoa paʻi.Eia kekahi, ʻoi aku ka liʻiliʻi o ke kaomi squeegee e waiho i ka ʻili stencil e waiho i kahi papa o ka solder paste, maʻalahi e hoʻopili i nā kiʻi a me nā hemahema ʻē aʻe.ʻO ka mea ʻē aʻe, ʻoi aku ka nui o ke kaomi squeegee e alakaʻi maʻalahi i ka paʻi solder paste ʻoi aku ka lahilahi, a hiki ke hōʻino i ka stencil.
2. Ke kihi ʻoki.
ʻO ka huina Scraper ka maʻamau 45 ° ~ 60 °, paʻi solder me ka ʻōwili maikaʻi.ʻO ka nui o ka huina o ka ʻōpala e pili ana i ka nui o ka ikaika kūpaʻa o ka ʻōpala ma ka paʻi solder, ʻoi aku ka liʻiliʻi o ke kihi, ʻoi aku ka nui o ka ikaika kūlou.Ma ka hoʻololi ʻana i ke kihi scraper hiki ke hoʻololi i ke kaomi i hana ʻia e ka scraper.
3. Paʻakiki Squeegee
ʻO ka paʻakikī o ka squeegee e pili pū i ka mānoanoa o ka paʻi solder paʻi.ʻO ka squeegee palupalu loa e alakaʻi i ka pahū solder paste, no laila pono e hoʻohana i ka squeegee ʻoi aku ka paʻakikī a i ʻole ka squeegee metala, me ka hoʻohana maʻamau i ka squeegee kila kila.
4. Ka māmā paʻi
Hoʻonohonoho ʻia ka wikiwiki paʻi ʻana i 15 ~ 100 mm / s.Inā lohi ka wikiwiki, nui ka viscosity paʻi solder, ʻaʻole maʻalahi ke haʻalele i ka paʻi, a pili i ka maikaʻi o ka paʻi.ʻO ka wikiwiki ka wikiwiki, ʻo ka squeegee ma ka manawa wehe ʻana o ka template he pōkole loa, ʻaʻole hiki ke hoʻokomo piha ʻia ka paʻi solder i loko o ka wehe, maʻalahi ke kumu ʻaʻole piha a leakage o nā hemahema.
5. ʻAha paʻi
ʻO ka paʻi paʻi e pili ana i ka mamao ma waena o ka lalo o ka stencil a me ka PCB surface, hiki ke hoʻokaʻawale i ka paʻi stencil i ka paʻi ʻana a me ka paʻi ʻole ʻole i ʻelua ʻano.ʻO ka paʻi ʻana o Stencil me kahi āpau ma waena o ka PCB i kapa ʻia ʻo ka paʻi ʻole pili, ʻo ke ākea ākea o 0 ~ 1.27mm, ʻaʻohe ʻano paʻi paʻi paʻi i kapa ʻia ka paʻi pili.Hiki i ka hoʻokaʻawale ʻana i ka stencil paʻi kiʻi ke hoʻololi i ka maikaʻi o ka paʻi ʻana e Z liʻiliʻi, ʻoi aku ka maikaʻi no ka pai pitch solder paste paʻi.Inā kūpono ka mānoanoa stencil, hoʻohana maʻamau ka paʻi pili.
6. Hoʻokuʻu wikiwiki
Ke hoʻopau ka squeegee i kahi paʻi paʻi, ʻo ka wikiwiki koke o ka stencil e haʻalele ana i ka PCB ua kapa ʻia ka wikiwiki demoulding.Hoʻoponopono kūpono i ka wikiwiki hoʻokuʻu, no laila e haʻalele ka stencil i ka PCB ke loaʻa kahi kaʻina hana pōkole, i hoʻokuʻu loa ʻia ka paʻi solder mai nā puka stencil (demolded), i mea e loaʻa ai ka Z maikaʻi loa solder paste kiʻi.ʻO ka wikiwiki o ka hoʻokaʻawale ʻana o PCB a me ka stencil e ʻoi aku ka hopena i ka hopena paʻi.He lōʻihi loa ka manawa demoulding, maʻalahi i ka lalo o ka stencil koena solder paste;He pōkole loa ka manawa demoulding, ʻaʻole kūpono i ka paʻi solder kū pololei, e pili ana i kona mālamalama.
7. Stencil hoʻomaʻemaʻe pinepine
ʻO ka hoʻomaʻemaʻe ʻana i ka stencil kahi mea e hōʻoia ai i ka maikaʻi o ka paʻi, hoʻomaʻemaʻe i ka lalo o ka stencil i ke kaʻina paʻi e hoʻopau i ka lepo ma lalo, e kōkua i ka pale ʻana i ka PCB contamination.Hoʻomaʻemaʻe pinepine ʻia me ka ethanol anhydrous ma ke ʻano he hoʻomaʻemaʻe.Inā loaʻa ke koena solder paste i ka wehe ʻana o ka stencil ma mua o ka hana ʻana, pono e hoʻomaʻemaʻe ʻia ma mua o ka hoʻohana ʻana, a no ka hōʻoia ʻana ʻaʻole e waiho ʻia kahi hoʻomaʻemaʻe hoʻomaʻemaʻe, inā ʻaʻole ia e hoʻopilikia i ka solder paste.Ua ʻōlelo maʻamau e hoʻomaʻemaʻe ʻia ka stencil me ka lima me ka stencil holoi pepa i kēlā me kēia 30 mau minuke, a pono e hoʻomaʻemaʻe ʻia ka stencil me ke kani ultrasonic a me ka waiʻona ma hope o ka hana ʻana e hōʻoia i ʻaʻohe koena solder paste i ka wehe ʻana.
Ka manawa hoʻouna: Dec-09-2021