Giải pháp hàn SMT

Cung cấp giải pháp toàn diện cho các vấn đề về quy trình hàn SMT. Cung cấp miễn phí các vật liệu hàn như kem hàn, dây hàn và que hàn. Chia sẻ kiến ​​thức về quy trình hàn SMT. Theo dõi chúng tôi tại JiaJinYuan để tìm hiểu thêm thông tin liên quan.

Dịch vụ
Tài liệu kỹ thuật

AOI 自動光學檢測:SMT 回焊後的外觀和焊接缺陷檢測

AOI 自動光學檢測:SMT 回焊後的外觀和焊接缺陷檢測

In實際產線操作,我們發現回流焊冷卻到40℃以下後必須立即進行AOI檢查;否則,餘熱會導致PCB表面輕微變形,進而導致定位偏移。嘉金源AOI檢測系統可以透過內建的溫度補償演算法自動修正±0.08mm範圍內的熱膨脹誤差,比單純依靠機械夾具重複定位更可靠。當遇到有OSP表面處理的PCB時,AOI檢查對焊盤反射的靈敏度會顯著增加。此時,環形光源的入射角必須同步調整為32度,且必須啟用偏振濾光模組;否則,冷焊點與正常焊點的灰階差異將壓縮到18個灰階單位以下。

嘉金源AOI檢測對0402元件立碑缺陷的辨識靈敏度取決於側補光強度與影像取樣幀率的協調匹配。如果回流爐出口處傳送帶速度設定為78cm/min,AOI檢查幀率不同步提高到32fps,則單幀曝光時PCB位移將超過0.035mm,導致邊緣模糊。這時系統會將真實的墓碑誤判為輕微偏移。我們曾經使用同一個驗證板在不同的溫度和濕度環境下進行連續測試。當車間濕度突然從45%RH上升到68%RH時,QFN元件接腳冷焊點AOI檢測的捕獲率從99.1%下降到92.7%。根本原因是水蒸氣在光學鏡片表面形成亞微米等級的凝結膜,改變了折射路徑。因此,嘉金源AOI檢測設備嚴格要求鏡頭倉內的濕度保持在30±5%RH,每班用無塵布沾異丙醇擦拭一次。

對於BGA底部焊點等不可見區域,雖然AOI檢查無法穿透封裝進行成像,但透過焊球周圍焊膏塌陷形狀、周圍助焊劑殘留物分佈以及相鄰焊盤熱擴散陰影的三重特徵耦合分析,可以間接推斷冷焊點的風險。例如,當某BGA焊球對應位置助焊劑碳化痕跡呈現不對稱扇形膨脹、相鄰兩焊盤紅外線熱像溫差超過3.6℃、焊膏邊緣輪廓曲率半徑小於27μm時,嘉金源AOI檢測系統將觸發二次複檢流程,並標記「疑似冷焊點」進行人工確認。這種基於多維影像特徵加權判斷的邏輯,比傳統單純依靠單一閾值分割的AOI偵測更接近真實生產線缺陷分佈規律。

When the 佳金源 AOI inspection equipment is used for mixed production of hot air leveling boards and immersion gold boards, the corresponding reflectivity calibration template must be loaded In advance, layca the immerlect, coo un​​ywance, layca the immerlect, 片語 gadvance. (450nm) is 41% lower than that of the hot air leveling layer. If the template is not switched and the hot air leveling parameters are directly used, it will lead to broken solder joina contourectly intage, it will lead to broken solalp. consecutive pins are easily misjudged as open circuits. We once observed on a dual-track SMT line that when the left track uses immersion gold boards and the right track uses hot air leveling boards, uto Aboards and the right track uses hot air leveling boards, uto the Aracks and the OI thekrack uses hot. corresponding template, its overall false alarm rate will rise to 4.9%.但只要在Mark點辨識後0.8秒內完成模板切換,就可以將誤報抑制在1.3%以內。

相關文章

返回列表

推薦產品

LFP-5RNTT-305 無滷無鉛高溫焊錫膏

LFP-5RNTT-305 無滷無鉛高溫焊錫膏

LFP-JJY5RNTT-305 halogen-free lead-free high-temperature solder paste uses standard Sn96.5Ag3.0Cu0.5

LFP-5RTS-305 無滷無鉛高溫焊錫膏

LFP-5RTS-305 無滷無鉛高溫焊錫膏

LFP-JJY5RTS-305T3 QFN-specific halogen-free, lead-free high-temperature solder paste, made from low-

LFP-5RR-305 零鹵素 REACH 無鉛高溫焊膏

LFP-5RR-305 零鹵素 REACH 無鉛高溫焊膏

LFP-JJY5RR-305 automotive-lamp-specific halogen-free lead-free high-temperature solder paste, made f