點(diǎn)膠機(jī)在點(diǎn)膠時(shí)要注意什么？
在點(diǎn)膠機(jī)行業(yè)中，出產(chǎn)中容易呈現(xiàn)以下幾個(gè)問(wèn)題，好比膠點(diǎn)巨細(xì)不匹配、拉絲、膠水浸染焊盤(pán)、固化強(qiáng)度不好易掉片等。解決這些問(wèn)題應(yīng)整體研究各項(xiàng)技術(shù)工藝參數(shù)，從而找到解決問(wèn)題的法子。
In the dispensing machine industry, the following problems are easy to appear in production, such as mismatch of glue point size, wire drawing, glue-impregnated pad, poor curing strength and easy chip dropping. To solve these problems, we should study the technological parameters as a whole so as to find a way to solve the problem.
那么如何解決點(diǎn)膠機(jī)在行業(yè)的這些問(wèn)題呢?具體有以下幾點(diǎn)來(lái)解決點(diǎn)膠機(jī)呈現(xiàn)的問(wèn)題.
So how to solve these problems in the dispensing machine industry? There are the following specific points to solve the dispensing machine problems.
1 點(diǎn)膠量的巨細(xì)
The size of a dispensing volume
按照工作經(jīng)驗(yàn)，膠點(diǎn)直徑的巨細(xì)應(yīng)為焊盤(pán)間距的一半，貼片后膠點(diǎn)直徑應(yīng)為膠點(diǎn)直徑的1.5倍。這樣就可以保證有充沛的膠水來(lái)粘結(jié)元件又避免過(guò)多膠水浸染焊盤(pán)。點(diǎn)膠量幾多由螺旋泵的扭轉(zhuǎn)時(shí)間長(zhǎng)短來(lái)抉擇，實(shí)際中應(yīng)按照出產(chǎn)環(huán)境(室溫、膠水的粘性等)選擇泵的扭轉(zhuǎn)時(shí)間。
According to the working experience, the size of the adhesive spot diameter should be half of the distance between the pads, and the diameter of the adhesive spot should be 1.5 times of the adhesive spot diameter after patching. This ensures that there is plenty of glue to bond components and avoids too much glue to impregnate the pad. The amount of dispensing is determined by the torsion time of the screw pump. In practice, the torsion time of the screw pump should be selected according to the production environment (room temperature, glue stickiness, etc.).
2 點(diǎn)膠壓力(背壓)
2 dispensing pressure (back pressure)
今朝所用點(diǎn)膠機(jī)采用螺旋泵供給點(diǎn)膠針頭膠管采納一個(gè)壓力來(lái)保證足夠膠水供給螺旋泵(以CAMALOT5000為例)。背壓壓力太大易造成膠溢出、膠量過(guò)多;壓力太小則會(huì)呈現(xiàn)點(diǎn)膠斷續(xù)現(xiàn)象，漏點(diǎn)，從而造成缺陷。應(yīng)按照同品質(zhì)的膠水、工作環(huán)境溫度來(lái)選擇壓力。環(huán)境溫度高則會(huì)使膠水粘度變小、流動(dòng)性變好，這時(shí)需調(diào)低背壓就可保證膠水的供給，反之亦然。
At present, the dispensing machine uses a screw pump to supply the dispensing needle hose to adopt a pressure to ensure that enough glue is supplied to the screw pump (CAMALOT5000 as an example). Back pressure pressure is too high to cause glue overflow and excessive glue volume; too low pressure will present the phenomenon of intermittent dispensing, leakage point, thus causing defects. Pressure should be selected according to the same quality glue and working environment temperature. High ambient temperature will make the glue viscosity smaller and fluidity better. At this time, it is necessary to reduce back pressure to ensure the glue supply, and vice versa.
3 針頭巨細(xì)
3 needle size
在工作實(shí)際中，針頭內(nèi)徑巨細(xì)應(yīng)為點(diǎn)膠膠點(diǎn)直徑的1/2，點(diǎn)膠過(guò)程中，應(yīng)按照PCB上焊盤(pán)巨細(xì)來(lái)拔取點(diǎn)膠針頭：如0805和1206的焊盤(pán)巨細(xì)相差不大，可以拔取同一種針頭，可是對(duì)于相差懸殊的焊盤(pán)就要拔取不合針頭，這樣既可以保證膠點(diǎn)質(zhì)量，又可以提橫跨產(chǎn)效率。
In practice, the inner diameter of the needle should be 1/2 of the diameter of the spot. In the process of dispensing, the needle should be pulled out according to the size of the pad on PCB. If the pad size of 0805 and 1206 is not different, the same needle can be pulled out, but for the pad with great difference, the needle should be pulled out, which can not only ensure the quality of the spot, but also improve the cross-production efficiency.
4 針頭與PCB板間的距離
Distance between 4 needles and PCB board
不合的點(diǎn)膠機(jī)采用不合的針頭，有些針頭有必然的止動(dòng)度(如CAM/A LOT 5000)。每次工作開(kāi)始應(yīng)做針頭與PCB距離的校準(zhǔn)，即Z軸高度校準(zhǔn)。
Non-conforming dispensing machines use non-conforming needles, and some needles have a certain degree of locomotion (such as CAM/A LOT 5000). The distance between needle and PCB should be calibrated at the beginning of each work, that is, Z axis height calibration.
5 膠水溫度
5 glue temperature
一般環(huán)氧樹(shù)脂膠水應(yīng)保留在0--5℃的冰箱中，操作時(shí)應(yīng)提前1/2小時(shí)拿出，使膠水充實(shí)與工作溫度相合適。膠水的操作溫度應(yīng)為23℃--25℃;環(huán)境溫度對(duì)膠水的粘度影響很大，溫渡過(guò)低則會(huì)膠點(diǎn)變小，呈現(xiàn)拉絲現(xiàn)象。環(huán)境溫度相差5℃，會(huì)造成50%點(diǎn)膠量變化。因而對(duì)于環(huán)境溫度應(yīng)加以節(jié)制。同時(shí)環(huán)境的溫度也應(yīng)該給以保證，濕度小膠點(diǎn)易變干，影響粘結(jié)力。
Generally, the epoxy resin glue should be kept in the refrigerator at 0 - 5 C, and should be taken out 1/2 hours in advance in order to make the glue full and suitable for the working temperature. The operating temperature of the glue should be 23 - 25 C. The ambient temperature has a great influence on the viscosity of the glue. If the temperature is too low, the glue point will become smaller, showing the phenomenon of wire drawing. The difference of ambient temperature is 5 C, which will cause 50% change of dispensing amount. Therefore, environmental temperature should be controlled. At the same time, the temperature of the environment should also be guaranteed. The adhesive point with small humidity is easy to dry, which affects the bonding force.
6 膠水的粘度
Viscosity of 6 glue
膠的粘度直接影響點(diǎn)膠的質(zhì)量。粘度大，則膠點(diǎn)會(huì)變小，甚拉絲;粘度小，膠點(diǎn)會(huì)變大，進(jìn)而可能滲染焊盤(pán)。點(diǎn)膠過(guò)程中，應(yīng)對(duì)不合粘度的膠水，拔取合理的背壓和點(diǎn)膠速度。
Viscosity of glue directly affects the quality of dispensing. If the viscosity is high, the adhesive point will become smaller, even wire drawing; if the viscosity is low, the adhesive point will become larger, and then the pad may be stained. In the process of dispensing, the glue that is not viscous should be pulled out with reasonable back pressure and dispensing speed.
7 固化溫度曲線(xiàn)
7 Curing Temperature Curve
對(duì)于膠水的固化，一般出產(chǎn)廠(chǎng)家已給出溫度曲線(xiàn)。在實(shí)際應(yīng)盡可能采用較高溫度來(lái)固化，使膠水固化后有足夠強(qiáng)度。
For the curing of glue, the temperature curve has been given by the manufacturer. In practice, higher temperature should be used as far as possible to make the glue strong enough after curing.
The above content is organized and published by Jinan two-component glue punch. More related content can be consulted by clicking on our official website: http://dejiansw.cn.
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