氮?dú)庠赟MT回流焊中的應(yīng)用
發(fā)布時(shí)間:2016-07-14 08:29:58 分類:企業(yè)新聞
雖然七十年代初氮?dú)饩鸵呀?jīng)應(yīng)用于電子制造,但是直到引入了免清洗技術(shù),因其需要在惰性氣體環(huán)境中進(jìn)行焊接,氮?dú)獾氖褂貌诺玫綇V泛的認(rèn)可。
1968首次進(jìn)行惰性氣體實(shí)驗(yàn)時(shí),波峰焊接設(shè)備都是開放式的。既沒有關(guān)于作業(yè)者安全和健康的規(guī)范,也沒有密封(enclosure)的要求。初,在波峰焊中使用氮?dú)鈨H僅是為了降低成本:
減少或消除氧化渣
減少機(jī)器的保養(yǎng)
改進(jìn)免清洗焊接的性能
氮保護(hù)層
九十年代初期開發(fā)的設(shè)備已采用隧道式結(jié)構(gòu),用來形成氮保護(hù)層(envelope)。保護(hù)層包圍著波峰焊接傳送帶,阻止空氣從入口和出口進(jìn)出。隧道腔的垂直高度應(yīng)盡可能低,密封框架上有窗口,便于觀察焊接過程。也可以取下窗口,接觸機(jī)器的內(nèi)部,對機(jī)器進(jìn)行維護(hù)和調(diào)整。
在印制板進(jìn)出的過程中,注入焊接系統(tǒng)的氮?dú)庾柚箍諝鈴拈_口處進(jìn)入。因此,氮?dú)獗仨毦S持正壓。一些輕的懸掛活動門鉸接在隧道的長度方向,以減少空氣的侵入。當(dāng)電路組件靠近時(shí),這些懸掛門可以向上翻轉(zhuǎn)。
當(dāng)?shù)獨(dú)饬鞒鏊淼肋M(jìn)出口時(shí),所有末端開口的隧道
設(shè)計(jì)都有一些排放氮?dú)獾姆椒?。通常需要平衡這種“廢氣”,以便將房間的空氣送到排氣管,可有助于防止廢氣從隧道中抽吸過量的氮?dú)?。注意,此時(shí)的關(guān)鍵是要降低溫度和減少氮?dú)獾膿p耗。
隧道的長度可以很短,僅履蓋預(yù)熱區(qū)和焊接槽;也可以是很長,從上料端到下料端。因而,長隧道的設(shè)備實(shí)際上覆蓋了助焊劑發(fā)配裝置(fluxer)、預(yù)熱區(qū)和波峰焊接區(qū)。
短隧道與長隧道之間的區(qū)別表現(xiàn)在所需氮?dú)獾牧可希合蛳到y(tǒng)注入雜質(zhì)含量為1ppm至2ppm的低溫氮?dú)鈺r(shí),焊接波峰周圍的氧氣雜質(zhì)應(yīng)低于10ppm。與長隧道相比,短隧道消耗更多的氮?dú)?,并且對車間的空氣氣流更加敏感。對空氣氣流的高敏感度通常會導(dǎo)致在波峰中所測量的純度不穩(wěn)定。
如論如何,這種裝置一直都在100ppm至200ppm的雜質(zhì)含量下使用,而且它為焊接制程帶來了明顯的好處。你可以對現(xiàn)有設(shè)備進(jìn)行改裝,使其可以使用氮?dú)?,但這將是一個(gè)昂貴且耗時(shí)的過程。
屏蔽波峰
惰性氣體環(huán)境中的波峰焊接還有其他方法,即采用屏蔽(shroud)
設(shè)計(jì)制成的護(hù)罩,圍繞在焊嘴的周圍直到焊接波峰回落到焊接槽的位置。“噴霧器”位于護(hù)罩底部,供給氮?dú)狻?/div>
這種方法主要的優(yōu)點(diǎn)是可以直接接觸系統(tǒng)。在密封的系統(tǒng)中,有可能使表面黏著零配件的表面達(dá)到回流焊的溫度,導(dǎo)致焊料回流。如果印制板翹曲或隧道出口處的“簾”接觸了印制板上面的SMD,這種可能性將會增加。另外,采用這種“屏蔽”技術(shù),完全消除了波峰焊后周圍區(qū)域溫度的問題。
Electrovert和Soltec公司已經(jīng)制造出了可以在開放式波峰中使用氮?dú)獾暮附酉到y(tǒng),他們發(fā)現(xiàn)氧化渣的減少同隧道式焊接系統(tǒng)做得一樣好。“屏蔽”的結(jié)果可以與采用電鍍、熱涂或熱風(fēng)整平印制板的焊接組件所獲得的結(jié)果相比。使用這項(xiàng)新技術(shù)的另外一個(gè)優(yōu)點(diǎn)是,其氮?dú)庀牧颗c昂貴的封閉式波峰焊接系統(tǒng)相同,甚至更低。
在用于表面黏著焊接的雙波峰系統(tǒng)中,可以對每一個(gè)波峰使用獨(dú)立的屏蔽罩和氮?dú)夤┙o控制。系統(tǒng)中沒有焊接組件時(shí),系統(tǒng)可進(jìn)入等待模式,將焊接波峰設(shè)置在較低的高度以減少氧化渣的生成,并停止或降低氮?dú)獾牧魉佟.?dāng)系統(tǒng)探測到印制板時(shí),它能夠重新激活正常作業(yè)控制設(shè)置。這種控制機(jī)理進(jìn)一步降低了氮?dú)獾南牧?。如果能夠只用一個(gè)波峰進(jìn)行焊接,便可節(jié)省更多的氮?dú)狻?/div>來源:
氮?dú)庠赟MT回流焊中的應(yīng)用
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