點膠機的針頭與膠水使用時應(yīng)該注意啥？
本身就是控制分配膠機吐痰和吐出的設(shè)備,因此使用點膠機勢必影響到電動膠的質(zhì)量問題解決:膠方面的膠水,膠水不能有氣泡,小氣泡會導(dǎo)致大量的焊盤沒有膠水,空現(xiàn)象,可能導(dǎo)致不合格的產(chǎn)品。
It is the equipment to control the spitting and spitting of the dispensing glue machine. Therefore, the use of the dispensing machine will inevitably affect the quality problem solving of the electric glue: the glue in the aspect of glue, the glue can not have bubbles, small bubbles will lead to a large number of pads without glue, empty phenomenon, which may lead to unqualified products.
所以每更換一半的膠管必須是空接頭，關(guān)于膠的固化，一般廠家都給出了一個溫度曲線。在實踐中應(yīng)盡量選擇溫度高的固化，使固化后的膠水達到強度要求。
Therefore, every half of the rubber tube to be replaced must be an empty joint. For the curing of rubber, the general manufacturer has given a temperature curve. In practice, high temperature curing should be selected as far as possible to make the cured glue meet the strength requirements.
膠液的粘度直接影響著膠液的質(zhì)量。粘度較大時，則膠點會變小，甚出現(xiàn)拉絲現(xiàn)象;粘度小，膠點會變大，然后可能會滲透到焊盤上。在上膠過程中，應(yīng)根據(jù)膠水的粘度不同，選擇合理的背壓和上膠速度。
The viscosity of glue directly affects the quality of glue. When the viscosity is large, the glue point will become smaller, or even wire drawing will occur; when the viscosity is small, the glue point will become larger, and then it may penetrate into the pad. In the process of gluing, the reasonable back pressure and gluing speed should be selected according to the viscosity of glue.
除去膠水對外界環(huán)境的影響，關(guān)于點膠機本身，一般企業(yè)使用的點膠機是使用螺桿泵供應(yīng)點膠針。
To remove the impact of glue on the external environment, as for the dispensing machine itself, the general enterprise uses a screw pump to supply dispensing needles.
因此，需求采用恒壓螺桿泵保證供膠，如果壓力過大，容易造成膠水溢出，膠量過多;壓力過小會出現(xiàn)點膠間歇、漏膠的現(xiàn)象，進而造成缺點。
Therefore, the constant pressure screw pump is required to ensure glue supply. If the pressure is too large, it is easy to cause glue overflow and excessive glue amount; if the pressure is too small, it will cause intermittent dispensing and glue leakage, which will cause defects.
所以應(yīng)根據(jù)膠水的不同質(zhì)量，點膠機工作環(huán)境的溫度來選擇壓力。較高的環(huán)境溫度會使膠水的粘度變小，流動性更好，這時需要降低背壓以保證膠水的供應(yīng)，反之亦然。
Therefore, the pressure should be selected according to the different quality of glue and the temperature of dispensing machine working environment. Higher ambient temperature will make the viscosity of glue smaller and the fluidity better. At this time, it is necessary to reduce the back pressure to ensure the supply of glue, and vice versa.
在實踐中，我們認為針的內(nèi)徑應(yīng)該是點膠點直徑的1/2，這是更理想的點膠方式。因此，在點膠過程中，應(yīng)根據(jù)PCB上焊盤的大小選擇點膠針，以保證點膠點的質(zhì)量，提高生產(chǎn)功率。
In practice, we think that the inner diameter of the needle should be 1 / 2 of the diameter of the dispensing point, which is the most ideal way of dispensing. Therefore, in the dispensing process, the dispensing needle should be selected according to the size of the pad on the PCB to ensure the quality of the dispensing point and improve the production power.
不同的點膠機選用不同的針，有些針有一定程度的停止。校正針與印刷電路板之間的距離，即， z軸高度校準，應(yīng)該在每一個操作的開始，這往往是簡單地忽略。
Different dispensing machines choose different needles, some of which stop to a certain extent. The distance between the calibration pin and the PCB, i.e. z-axis height calibration, should be at the beginning of each operation, which is often simply ignored.
根據(jù)操作經(jīng)驗，焊點的直徑應(yīng)該是焊盤距離的一半，貼片后的接點直徑應(yīng)該是接點直徑的1.5倍。
According to the operation experience, the diameter of the welding spot should be half of the distance between the pads, and the diameter of the contact after mounting should be 1.5 times of the diameter of the contact.
這確保了有足夠的膠水來粘合元素，并防止太多的膠水浸透墊。由螺桿泵的旋轉(zhuǎn)時間多少來確定實踐的長度，應(yīng)根據(jù)室溫、膠的粘度來選擇泵的旋轉(zhuǎn)時間。
This ensures that there is enough glue to bond the elements and prevents too much glue from soaking the pad. The practical length is determined by the rotation time of the screw pump. The rotation time of the pump should be selected according to the room temperature and the viscosity of the glue.
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