點(diǎn)膠機的針頭與膠水使用時(shí)應該注意啥？
本身就是控制分配膠機吐痰和吐出的設備,因此使用點(diǎn)膠機勢必影響到電動(dòng)膠的質(zhì)量問(wèn)題解決:膠方面的膠水,膠水不能有氣泡,小氣泡會(huì )導致大量的焊盤(pán)沒(méi)有膠水,空現象,可能導致不合格的產(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空接，關(guān)于膠的固化，一般廠(chǎng)家都給出了溫度曲線(xiàn)。在實(shí)踐中應盡量選擇溫度較高的固化，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 air jointed. For the curing of the rubber, the general manufacturer has given the temperature curve. In practice, we should try our best to choose a high temperature curing to make the cured glue meet the strength requirements.
膠粘劑的粘度直接影響著(zhù)膠液的質(zhì)量。粘度高，上膠點(diǎn)小，拉絲均勻;粘度小時(shí)，膠點(diǎn)會(huì )變大，然后可能滲到膠墊上。在配膠過(guò)程中，對不同粘度的膠應選擇合理的背壓和配膠速度。
The viscosity of adhesive directly affects the quality of glue solution. The viscosity is high, the glue point is small, and the drawing is even; when the viscosity is small, the glue point will become larger, and then it may seep onto the rubber pad. In the process of dispensing, a reasonable back pressure and dispensing speed should be selected for different viscosities.
除去膠水和外部環(huán)境的影響，關(guān)于點(diǎn)膠機本身，一般企業(yè)點(diǎn)膠機都是選用螺桿泵點(diǎn)膠針。
In addition to the influence of glue and external environment, as for dispensing machine itself, screw pump dispensing needle is generally used in enterprise dispensing machine.
因此，需求采用恒壓，保證螺桿泵能滿(mǎn)足膠水供應。如果壓力過(guò)小，就會(huì )出現間歇點(diǎn)膠、滲漏的現象，進(jìn)而造成缺陷。
Therefore, constant pressure is required to ensure that the screw pump can meet the glue supply. If the pressure is too small, there will be intermittent dispensing and leakage, which will cause defects.
所以應根據膠液質(zhì)量的不同，分膠機工作環(huán)境的溫度來(lái)選擇壓力。較高的環(huán)境溫度會(huì )使膠水粘度變小，流動(dòng)性更好，這時(shí)需要減少背壓以保證膠水的供應，反之亦然。
Therefore, the pressure should be selected according to the temperature of the working environment of the dispenser according to the quality of the glue. Higher ambient temperature will make the glue viscosity smaller and fluidity better. At this time, it is necessary to reduce the back pressure to ensure the supply of glue, and vice versa.
在實(shí)踐中，我們認為針的內徑尺寸應該是點(diǎn)膠點(diǎn)直徑的1/2，這是更理想的點(diǎn)膠方式。因此，在點(diǎn)膠過(guò)程中，應根據PCB上焊盤(pán)的大小選擇點(diǎn)膠針，以保證點(diǎn)膠點(diǎn)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 dispensing point diameter, which is the most ideal dispensing way. 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.
不同的配藥器選用不同的配針，有些配針有一定程度的停藥。在每一次操作的開(kāi)始，都要對針與PCB之間的間距進(jìn)行校準，即z軸高度校準，這一點(diǎn)往往被忽略。
Different dispensing devices choose different dispensing needles, some of which have a certain degree of drug withdrawal. At the beginning of each operation, the clearance between the pin and PCB should be calibrated, that is, z-axis height calibration, which is often ignored.
根據操作經(jīng)驗，膠點(diǎn)直徑應為焊盤(pán)距離的一半，補片后的膠點(diǎn)直徑應為膠點(diǎn)直徑的1.5倍。
According to operation experience, the diameter of glue point shall be half of the distance between pads, and the diameter of glue point after patch shall be 1.5 times of the diameter of glue point.
這確保有足夠的膠水來(lái)保持元件在一起，并防止過(guò)多的膠浸漬墊。上膠量由螺桿泵的旋轉時(shí)間決定。實(shí)際使用時(shí)，應根據室溫和膠水的粘度來(lái)選擇泵的旋轉時(shí)間。
This ensures that there is enough glue to keep the components together and to prevent excessive glue impregnation. The amount of glue is determined by the rotation time of screw pump. In actual use, the rotation time of the pump should be selected according to the room temperature and the viscosity of the glue.
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