The hottest Zhongshan connector hardware factory

2022-08-11
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Zhongshan connector hardware factory

1. PCB board is not preheated sufficiently during reflow soldering

2. The setting of reflow temperature curve is unreasonable, and there is a large distance between the plate surface temperature before entering the welding area and the welding area temperature

3. The solder paste failed to fully return to room temperature when taken out of the cold storage

4. After the solder paste is opened, it is exposed to the air for a long time

5. Tin powder splashed on the surface of PCB when pasting

6. During printing or handling, there is oil or water sticking to the PCB board

7. The distribution of flux in solder paste is unfair, including solvent or liquid additives or activators that are not easy to transpiration

the layout of meta equipment in PCBA processing affects the quality of SMT process. Zhongshan connector hardware factory_ Cairun industry, therefore, in the layout of yuan equipment, it needs to be done according to the relevant process requirements. The correct layout planning can minimize the welding defects. Zhongshan plug-in Hardware Factory_ Cairun industry ensures product quality. Next, Jingbang technician will introduce the layout requirements of PCBA processing equipment

pcba processing

1. The components of PCB should be evenly distributed as far as possible. Components of the same kind of packaging should be consistent in orientation, polarity and spacing as far as possible. The regular placement is convenient for viewing and is conducive to improving the speed of patches/plug-ins; Uniform distribution is conducive to heat dissipation and optimization of welding process

2. The power element equipment should be placed evenly on the edge of the PCB or the ventilation direction in the chassis to ensure good heat dissipation

3. Do not put precious meta equipment on the corners and edges of PCB. Zhongshan connector hardware factory_ Cairun industry, or close to connectors, installation holes, slots, cuts, notches and corners of panels, these directions are the high stress areas of PCB, which simply form the cracking of solder joints and meta equipment

II. Check the meta equipment before mounting:

(1) pick up materials (PCB, meta equipment) and check according to the mounting schedule of product process documents

(2) as for the PCB that has been opened, we need to clean and bake it according to the length of the opening time and whether it is affected by moisture or pollution

(3) for the equipment with moisture-proof requirements, check whether it is damp, and remove the damp on the damp equipment. After unpacking, check the humidity display card attached to the package. When the indicated humidity is more than 20% (read at 23 ℃ ± 5 ℃), it indicates that the equipment is now damp, and the damp equipment should be dehumidified

Huizhou BOLUO cairun Industrial Co., Ltd. is located in Longxi street, BOLUO County, with a unique geographical location, facing Dongguan across the river, facing Shenzhen and Hong Kong in the South and Guangzhou in the north. Guangzhou Huizhou Expressway and Guangzhou Shantou high-speed railway have stations in Longxi, with convenient transportation in all directions

cells are generally divided into monocrystalline silicon, polycrystalline silicon, and amorphous silicon. Monocrystalline silicon solar cells were the fastest developed solar cells at that time. Its structure and production process have been finalized, and products have been widely used in space and on the ground. This kind of solar cell is made of high-purity monocrystalline silicon rod. In order to reduce production costs, solar cells used on the ground now use solar grade monocrystalline silicon rods, and the data performance indicators have been relaxed. Some can also use the head and tail materials and waste secondary monocrystalline silicon materials processed by semiconductor devices to make monocrystalline silicon rods for solar cells through compound drawing

the hardware battery is mainly conductive. It is also said that the battery slice, remote control battery slice, battery touch slice and battery spring slice are within ± 0.5% of the set value Battery buckle, pot piece, touch piece, spring piece, battery clip piece, electrode piece. It is mainly used in remote control, electronic toys, calculators, pedometers, microphones, recorders, radios, stereos, cameras, lighting and other industries

Huizhou BOLUO cairun Industrial Co., Ltd. is located in Longxi street, BOLUO County, with a unique geographical location, facing Dongguan across the river, facing Shenzhen and Hong Kong in the South and Guangzhou in the north. Guangzhou Huizhou Expressway and Guangzhou Shantou high-speed railway have stations in Longxi, with convenient transportation in all directions

smt SMT chip components are particularly small and light, and dents are pressed on the surface of the sample. SMT chip components are easier to weld than lead components. There is another important advantage of SMD components, which is to improve the stability and reliability of the circuit. For manufacturing, it is to improve the success rate of manufacturing. This is because the chip components have no leads, and then reduce the stray electric field and stray magnetic field, which is particularly obvious in high-frequency analog circuits and high-speed digital circuits

when SMT chip components are welded, the die discharge is uniform and the plastic is excellent. The method of drawing the setting sleeve is: put the components on the pad, and then paint the adjusted chip solder paste on the pin of the component and the touch of the pad (pay attention not to paint too much to prevent short circuit), and then use 20W internal heated electric soldering iron to heat the junction between the pad and SMT chip components (the temperature should be 220~230 ℃), and remove the electric soldering iron after seeing the solder melt, The welding will be completed after the solder solidifies. After welding, we can give you the technical tweezers of the experimental machine to clamp a clip of the soldered patch components to see if they are loose. If they are not loose (they should be very strong), it means that the welding is good. If they are loose, wipe the patch solder paste from the beginning and weld from the beginning according to the above methods

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