打膠機(jī)點(diǎn)膠時(shí)的三個(gè)常見缺陷
打膠機(jī)點(diǎn)膠時(shí)的常見缺陷的存在，如果不及時(shí)處理，很容易在生產(chǎn)中造成質(zhì)量問題，甚影響各種性能的展示。那么下面就來講講相關(guān)內(nèi)容吧。
If the common defects of the glue dispenser are not handled in time, it is easy to cause quality problems in production and even affect the display of various performances. Now let's talk about the relevant content.
膠水的牽拉和拖尾是點(diǎn)膠過程中的普遍現(xiàn)象。即使是專為高速點(diǎn)膠而配制的膠水也可能出現(xiàn)拉絲現(xiàn)象，膠水更容易脫落，還可能造成虛焊等。這可能是因?yàn)榇蚰z機(jī)設(shè)備的工藝參數(shù)調(diào)整不當(dāng)，比如針頭內(nèi)徑太小、點(diǎn)膠壓力太大、針頭與PCB距離過大等。
The pulling and trailing of glue is a common phenomenon in the dispensing process. Even the glue specially prepared for high-speed dispensing may cause wiredrawing, which makes the glue easier to fall off, and may also cause faulty welding. This may be due to improper adjustment of process parameters of the glue applicator equipment, such as too small inner diameter of the needle, too large dispensing pressure, too large distance between the needle and PCB, etc.
另一個(gè)原因可能是對膠粘劑的性能了解不夠，膠粘劑與應(yīng)用工藝不兼容，或者膠粘劑質(zhì)量差、粘度變化或已過期。拉線/拖尾也可能是由其他原因引起的，例如對板的靜電放電、板的彎曲或板的支撐不足等。
Another reason may be the insufficient understanding of the properties of the adhesive, the incompatibility between the adhesive and the application process, or the poor quality, viscosity change or expired of the adhesive. The stay wire / tailing may also be caused by other reasons, such as electrostatic discharge to the plate, bending of the plate or insufficient support of the plate.
針對以上原因，可以調(diào)整工藝參數(shù)，更換內(nèi)徑較大的針頭，降低點(diǎn)膠壓力，調(diào)整針頭距離PCB的高度；同時(shí)檢查所用貼片膠的生產(chǎn)日期、膠的性能和使用要求，是否適合該工藝、涂層等。如果貼片膠確實(shí)變質(zhì)，可以更換。此外，實(shí)踐證明，控制拉絲/拖尾的好的方法是在點(diǎn)膠針上或附近加熱，以降低粘度，貼片膠易斷裂，不會產(chǎn)生拉絲/拖尾。
For the above reasons, the process parameters can be adjusted, the needle with larger inner diameter can be replaced, the dispensing pressure can be reduced, and the height between the needle and PCB can be adjusted; At the same time, check the production date of the used patch adhesive, the performance and use requirements of the adhesive, and whether it is suitable for the process, coating, etc. If the patch adhesive is indeed deteriorated, it can be replaced. In addition, practice has proved that a good way to control wire drawing / tailing is to heat on or near the dispensing needle to reduce the viscosity. The patch adhesive is easy to break and will not produce wire drawing / tailing.
沒有時(shí)間打印或膠量太少。點(diǎn)膠時(shí)有一點(diǎn)點(diǎn)膠動作，但沒有出膠或針頭出膠太小。可能是貼片膠中混入了氣泡，針頭被堵住，或者生產(chǎn)線氣壓不夠。這時(shí)候注射器內(nèi)的膠水要去泡，尤其是自己裝的膠水。經(jīng)常更換干凈的針頭，適當(dāng)調(diào)整機(jī)器壓力。如果經(jīng)常發(fā)生堵塞，可以考慮更換其他的貼片膠。
No time to print or too little glue. There is a little glue action during dispensing, but there is no glue output or the glue output of the needle is too small. It may be that bubbles are mixed in the patch adhesive, the needle is blocked, or the air pressure of the production line is not enough. At this time, the glue in the syringe should be soaked, especially the glue installed by yourself. Always replace clean needles and properly adjust the machine pressure. In case of frequent blockage, consider replacing the patch adhesive of other brands.
明顯不連續(xù)的膠點(diǎn)。
雙組份打膠機(jī)廠家認(rèn)為不連續(xù)的點(diǎn)尺寸會影響組件和PCB之間結(jié)合強(qiáng)度的整體一致性。出現(xiàn)這種現(xiàn)象的原因如下：針的頂針落在墊子上，換一根針就可以解決問題；恢復(fù)時(shí)間也不夠。增加延遲可以解決恢復(fù)問題。然后或隨著膠面水平下降，壓力時(shí)間不足以完成點(diǎn)膠周期，可以通過增加壓力與周期時(shí)間的比例來糾正膠點(diǎn)尺寸不連續(xù)的問題。
Obviously discontinuous glue spots. The manufacturer of the two-component glue applicator believes that the discontinuous point size will affect the overall consistency of the bonding strength between the component and PCB. The reasons for this phenomenon are as follows: the thimble of the needle falls on the mat, and changing a needle can solve the problem; Recovery time is not enough. Increasing latency can solve the recovery problem. Then, or as the glue surface level drops, the pressure time is not enough to complete the dispensing cycle. The problem of discontinuous glue dot size can be corrected by increasing the ratio of pressure to cycle time.
The common defects of the dispenser during dispensing are explained in three aspects here. You can pay attention to our website www.jntiannuo Learn more about consulting.
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