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rel="nofollow" target="_blank" style="color:#ACACAC">長(zhǎng)科順科技</a></span> <span>時(shí)間：2021-04-23</span> <span>來(lái)源：工程師</span> <link rel="stylesheet" type="text/css"/> <span style="float:right; width:130px;margin-right:0px; text-align:right;"> <div id="wfihi4y" class="nav0"> <ul> <li><a href="javascript:void(0);"><img src="http://cafeforensic.com/event/action/images/icon_add_4.png" width="20" border="0" align="absmiddle" />加入技術(shù)交流群</a> <ul> <li style="text-align:center;"><img src="http://cafeforensic.com/event/company/images/code_1.jpg" width="130"><br />掃碼加入<br />和技術(shù)大咖面對(duì)面交流<br />海量資料庫(kù)查詢(xún)</li> </ul> </li> </ul> </div> </span> <span style="float:right; display:block; width:70px; text-align:center; font-size:12px; line-height:18px; height:20px; background:#fdfdfd; border:#e89015 solid 1px; border-radius:3px; color:#333;margin-right: 0px;"><a target="_blank">發(fā)布文章</a></span> </div> <div id="8i9afej" class="hAd4_Afinal20a_back">  <iframe id='a890e388' name='a890e388' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='660' height='60'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE&n=a635e61e' border='0' alt='' /></a></iframe> </div> <div style="margin-top:28px;"></div> <div id="c8ntt83" class="content" id="contentDiv" style="position:relative;"> <div id="cjlqsqy" class="ad_300x180_Afinal13_back">  <iframe id='a225770a' name='a225770a' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='300' height='200'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE&n=a576c0a2' border='0' alt='' /></a></iframe> </div> <span id="contentlabels" style="font-size:14px;"><p style="border: 0px; margin-top: 0.63em; margin-bottom: 1.8em; padding: 0px; counter-reset: list-1 0 list-2 0 list-3 0 list-4 0 list-5 0 list-6 0 list-7 0 list-8 0 list-9 0; color: rgb(25, 25, 25); font-family: "PingFang SC", Arial, 微軟雅黑, 宋體, simsun, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">最近人問(wèn)到關(guān)于SMT焊點(diǎn)空洞的問(wèn)題，對(duì)于產(chǎn)品的空洞率提出了很高的要求。因?yàn)槭轻t(yī)療呼吸機(jī)上用的電路板需要始終保持穩(wěn)定性和可靠性。設(shè)計(jì)方強(qiáng)調(diào)說(shuō)如果存在空洞就會(huì)增加產(chǎn)品的氧化，提前導(dǎo)致產(chǎn)品的的老化反應(yīng)加深。對(duì)產(chǎn)品后期的穩(wěn)定性都有一定的影響。</p><p style="border: 0px; margin-top: 0.63em; margin-bottom: 1.8em; padding: 0px; counter-reset: list-1 0 list-2 0 list-3 0 list-4 0 list-5 0 list-6 0 list-7 0 list-8 0 list-9 0; color: rgb(25, 25, 25); font-family: "PingFang SC", Arial, 微軟雅黑, 宋體, simsun, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">所以為了減少空洞率，在貼片加工中需要使用到真空回流焊這個(gè)設(shè)備。因?yàn)樾碌漠a(chǎn)品越來(lái)越多品質(zhì)產(chǎn)生了更高的要求。就需要新的設(shè)備，新的設(shè)備的投入就需要PCBA加工廠不斷的提SMT加工工藝的能力，同時(shí)增加對(duì)技術(shù)員的培訓(xùn)和和上崗指導(dǎo)。以此來(lái)保證焊接質(zhì)量的高標(biāo)準(zhǔn)，以此來(lái)提高產(chǎn)品的可靠性和穩(wěn)定性。</p><p style="border: 0px; margin-top: 0.63em; margin-bottom: 1.8em; padding: 0px; counter-reset: list-1 0 list-2 0 list-3 0 list-4 0 list-5 0 list-6 0 list-7 0 list-8 0 list-9 0; color: rgb(25, 25, 25); font-family: "PingFang SC", Arial, 微軟雅黑, 宋體, simsun, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">但是，就站在SMT貼片加工的角度來(lái)說(shuō)空洞率是避免不了的。任何廠家也不能說(shuō)自己的貼片焊接焊點(diǎn)沒(méi)有一點(diǎn)空洞。</p><p style="border: 0px; margin-top: 0.63em; margin-bottom: 1.8em; padding: 0px; counter-reset: list-1 0 list-2 0 list-3 0 list-4 0 list-5 0 list-6 0 list-7 0 list-8 0 list-9 0; color: rgb(25, 25, 25); font-family: "PingFang SC", Arial, 微軟雅黑, 宋體, simsun, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">那么空洞是如何產(chǎn)生的呢？產(chǎn)生空洞的原因有哪些呢？經(jīng)長(zhǎng)科順（www.smt-dip.com）工程師分析，產(chǎn)生空洞主要是由以下幾個(gè)原因：</p><p style="border: 0px; margin-top: 0.63em; margin-bottom: 1.8em; padding: 0px; counter-reset: list-1 0 list-2 0 list-3 0 list-4 0 list-5 0 list-6 0 list-7 0 list-8 0 list-9 0; color: rgb(25, 25, 25); font-family: "PingFang SC", Arial, 微軟雅黑, 宋體, simsun, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">一、焊膏。焊膏的合金成分的不同，顆粒的大小，在錫膏印刷的過(guò)程中會(huì)造成氣泡在回流焊接時(shí)會(huì)繼續(xù)殘留一些空氣，經(jīng)過(guò)高溫氣泡破裂后會(huì)產(chǎn)生空洞。</p><p style="border: 0px; margin-top: 0.63em; margin-bottom: 1.8em; padding: 0px; counter-reset: list-1 0 list-2 0 list-3 0 list-4 0 list-5 0 list-6 0 list-7 0 list-8 0 list-9 0; color: rgb(25, 25, 25); font-family: "PingFang SC", Arial, 微軟雅黑, 宋體, simsun, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">二、PCB焊盤(pán)表面處理方式。焊盤(pán)表面處理對(duì)于產(chǎn)生空洞的也有著至關(guān)重要的影響。</p><p style="border: 0px; margin-top: 0.63em; margin-bottom: 1.8em; padding: 0px; counter-reset: list-1 0 list-2 0 list-3 0 list-4 0 list-5 0 list-6 0 list-7 0 list-8 0 list-9 0; color: rgb(25, 25, 25); font-family: "PingFang SC", Arial, 微軟雅黑, 宋體, simsun, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">三、回流曲線設(shè)置?；亓骱笢囟热绻郎剡^(guò)慢或者降溫過(guò)快都會(huì)使內(nèi)部殘留的空氣無(wú)法有效排除。</p><p style="border: 0px; margin-top: 0.63em; margin-bottom: 1.8em; padding: 0px; counter-reset: list-1 0 list-2 0 list-3 0 list-4 0 list-5 0 list-6 0 list-7 0 list-8 0 list-9 0; color: rgb(25, 25, 25); font-family: "PingFang SC", Arial, 微軟雅黑, 宋體, simsun, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">四、回流環(huán)境。這就是設(shè)備是否是真空回流焊對(duì)一個(gè)參考因素了。</p><p style="border: 0px; margin-top: 0.63em; margin-bottom: 1.8em; padding: 0px; counter-reset: list-1 0 list-2 0 list-3 0 list-4 0 list-5 0 list-6 0 list-7 0 list-8 0 list-9 0; color: rgb(25, 25, 25); font-family: "PingFang SC", Arial, 微軟雅黑, 宋體, simsun, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">五、焊盤(pán)設(shè)計(jì)。焊盤(pán)設(shè)計(jì)合不合理，也是一個(gè)很重要的原因。</p><p style="border: 0px; margin-top: 0.63em; margin-bottom: 1.8em; padding: 0px; counter-reset: list-1 0 list-2 0 list-3 0 list-4 0 list-5 0 list-6 0 list-7 0 list-8 0 list-9 0; color: rgb(25, 25, 25); font-family: "PingFang SC", Arial, 微軟雅黑, 宋體, simsun, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">六、微孔。這是一個(gè)最容易被忽視的點(diǎn)，如果沒(méi)有預(yù)留微孔或者位置不對(duì)，都可能產(chǎn)生空洞。</p><p style="border: 0px; margin-top: 0.63em; margin-bottom: 1.8em; padding: 0px; counter-reset: list-1 0 list-2 0 list-3 0 list-4 0 list-5 0 list-6 0 list-7 0 list-8 0 list-9 0; color: rgb(25, 25, 25); font-family: "PingFang SC", Arial, 微軟雅黑, 宋體, simsun, sans-serif; white-space: normal; background-color: rgb(255, 255, 255);">以上是長(zhǎng)科順為您提供的關(guān)于SMT貼片加工中空洞的一些原因分析，希望對(duì)大家有所幫助！</p><p><br /></p></span> <p style="color:#666; 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