systems - printed circuit board assembly

by:MERITSUN     2019-11-23
systems  -  printed circuit board assembly
Quality production technology when the product will be mass produced, investing in professional equipment and processes may cost the manufacturer less money in the long run, as this will ensure higher costs
High quality products and faster production process.
Pick and place assembly is when the robot automatically picks up the assembly and places it on the board, with a suction cup for picking up and arranging the assembly in the correct position on the board.
For the production of printed circuit boards (PCBs)
Electrical system.
While buying machines and programming is expensive and time
Consumption, their performance is fast and accurate, which is also the cost-
Effective when producing circuits in large quantities.
Manual assembly of components can be tedious and time-
Consumption, because the components are small, it takes longer to be installed in place when done by hand.
This assembly method is mainly used for circuits consisting of components that install pins through the circuit board.
This is an expensive and slow production method that is more suitable for professional production of a small number of electronic products such as TV, radio and alarm.
Flow welding is a technique used to quickly connect components to a circuit board without the need for manual input.
This improves accuracy and speed and reduces welding usage.
To allow continuous addition of components to several boards, surface mounting techniques (SMT)is used.
This allows for easy connection while taking up as little space as possible.
Once the SMT assembly is pre-placed on the PCB
Weld and paste the pads, put in an oven with precise control, in which the solder melts to the correct position and creates an accurate connection.
Wave welding is a fast, efficient and accurate method of soldering pcb for mass production of pcb.
The component passes through its pin through pre-
Drill and install on conveyor belt
This will allow the board to go through a series of stages: the flux is added to the lower side plate to help weld the flow, which is then heated and welded through a wave. The flux covers the pins under the PCB and the accuracy of production is critical in generating electrical or mechanical products.
If part of the process is poorly installed or too large, the product will not work and may pose a risk to the user.
How accurate it is to describe the product is tolerance. curriculum-key-
FactTolerance describes the product in /-mm.
Poorly assembled mechanical parts will have poor performance and may have very small tolerance measurements.
For example, chains or gears that are slightly larger or smaller than necessary are easily stuck and broken.
Printed circuit board (PCBs)
Need to be very accurate, any tolerance measurement may only be /-
1mm, stop touching any material and cause the circuit to stop working.
The resistance used in the circuit has tolerances related to the amount of power allowed to enter the circuit.
The smaller the tolerance, the less likely the circuit is overloaded and damaged, but the more expensive the resistance is.
The tolerance of the resistance is shown as the color of the fourth stripe, usually silver, or the value of the goldExampleA resistance is 1,500 Ω and the tolerance is /-10 per cent. 1,500 × 0.
1 = 150 tolerance range = 150 Ω on both sides of 1,500 Ω mark.
1,500 Ω 150 Ω = 1,350 Ω minimum 1,500 Ω-
150 Ω = 1,650 Ω maximum 22,000 Ω resistance tolerance is /-5 per cent.
What is the minimum and maximum value of this resistor?
The answer is 22,000x0.
05 = 1,100 on both sides of the 22,000 Ω mark. 22,000 -
1,100 = 20,900 Ω minimum22, 000 1,100 = 23,100 Ω maximum quality control during manufacturing, quality control (QC)
Check.
These can be checked: whether the pcb is accurately cut, whether the parts are connected, whether the shell is connected, and whether the edges on the casting are trimmedkey-
Quality Control (QC)
Is the inspection system throughout the manufacturing process to ensure that each step is completed with high standards.
Quality control checks can be as simple as visual checks to ensure that all components are properly installed on the board.
To check whether these components are suitable and working properly, a multimeter and/or logic probe can be used to produce the correct output in the circuit.
While quality control checks can add to waste as defective products are thrown away, if a factory is known for its reliable high quality, then saving money in the long run by re-ordering products
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