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Five common sense of automatic dispenser

Release time: October 09, 2019 11:33:40 source: http://1xuewen.com
 Five common sense of automatic dispenser.

1. According to the operation experience, the diameter of the glue spot should be half of the distance between the pad and the diameter of the glue spot after pasting
 It should be 1.5 times of the glue spot diameter. This ensures that there is enough glue to bond the components and prevent them from passing
 More glue impregnated pads.

2. If the pressure is too small, it will cause overflow and excessive glue
 Intermittent dispensing and leakage, and then cause defects. It should be based on the same quality of glue and working environment
 Temperature selection pressure. High ambient temperature will reduce the viscosity of the glue and improve its fluidity. In this case
 Under the condition of full automatic Dispenser  Common sense can ensure that the back pressure is able to drop through the glue
 And vice versa.

In fact, the inner diameter of the needle should be 1 / 2 of the diameter of the glue distribution point. During dispensing, the dispensing needle
 Should be selected according to the size of the pad on the PCB: if the pad size 0805 and 1206 are not
 The same pin can be selected, but different pins should be selected for pads of different sizes
 Not only can ensure the quality of the glue point, but also can improve the production efficiency.

4. Pin pitch PCB

Different fully automatic Dispenser Using different needles, some have a certain stop. Needle and print
 The distance between circuit boards shall be calibrated at the beginning of each operation, i.e. z-axis height calibration.

5. Glue temperature

Generally, epoxy glue should be stored in the refrigerator at 0-5 ℃. Take it out half an hour in advance
 The water operation temperature is fully in line with. The application temperature of glue should be 23 ℃ - 25 ℃; the ambient temperature should be 23 ℃ - 25 ℃
 Viscosity has a great influence. If the temperature is too low, the glue point will become smaller and wire drawing will occur. Ambient temperature
 The difference of 5 ℃ will lead to 50% change of the partition volume. Therefore, according to the automatic dispensing machine common sense
 Key, should control the environment temperature, at the same time, should also ensure that the environment temperature, humidity small glue point is simple
 Drying affects adhesion.