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Time of issue:2020-07-15 00:00:00
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What are the precautions when making SMT steel mesh
What
In the SMT process, stencil production is an indispensable step, and it also plays a vital role, because it determines whether the tin on each pad is uniform and full, which affects the reflow of SMT components after mounting Welding reliability after welding.
Generally speaking, it is necessary to carefully analyze the characteristics of each PCB to develop steel mesh. For circuit boards with high-precision quality requirements, laser steel mesh must be used, and SMT engineers are required to confirm the process flow, and adjust the aperture of the opening appropriately to ensure Tin effect. However, there are some things to pay attention to when making steel mesh. The following Sanjing will take you to understand:
①ME requires the supplier to make steel mesh according to the relevant documents and materials provided by the engineering department.
②The frame size requirements of the steel mesh, such as 550mm*650mm, 370mm*470mm, are mainly determined...
See more information
In the SMT process, stencil production is an indispensable step, and it also plays a vital role, because it determines whether the tin on each pad is uniform and full, which affects the reflow of SMT components after mounting Welding reliability after welding.
Generally speaking, it is necessary to carefully analyze the characteristics of each PCB to develop steel mesh. For circuit boards with high-precision quality requirements, laser steel mesh must be used, and SMT engineers are required to confirm the process flow, and adjust the aperture of the opening appropriately to ensure Tin effect. However, there are some things to pay attention to when making steel mesh. The following Sanjing will take you to understand:
①ME requires the supplier to make steel mesh according to the relevant documents and materials provided by the engineering department.
②The frame size requirements of the steel mesh, such as 550mm*650mm, 370mm*470mm, are mainly determined...
PCBA production stage and testing method
PCBA
As we all know, after PCBA production is completed, product inspection is required. There are many inspection methods, but each inspection method has its own advantages and disadvantages. Therefore, it is particularly important to choose a suitable inspection method.
PCBA production is generally divided into three stages: new product prototype manufacturing, trial production, and mass production. Corresponding inspection programs should be set up at each stage. The following Sanjing will take you to understand:
(1) New product prototype manufacturing: New product prototype testing is generally adjusted in conjunction with process parameters, and planning for timeliness, reliability, and economy. The main detection methods are: ① Solder paste coating inspection...
See more information
As we all know, after PCBA production is completed, product inspection is required. There are many inspection methods, but each inspection method has its own advantages and disadvantages. Therefore, it is particularly important to choose a suitable inspection method.
PCBA production is generally divided into three stages: new product prototype manufacturing, trial production, and mass production. Corresponding inspection programs should be set up at each stage. The following Sanjing will take you to understand:
(1) New product prototype manufacturing: New product prototype testing is generally adjusted in conjunction with process parameters, and planning for timeliness, reliability, and economy. The main detection methods are: ① Solder paste coating inspection...
What are the requirements of SMT production equipment for PCB
What
When designing a PCB, the first consideration is the shape of the PCB. When the size of the PCB is too large, the printed lines will increase, resulting in increased impedance and reduced noise immunity, and the cost will increase accordingly; if the size is too small, the heat dissipation will not be good, and adjacent lines will also be easily disturbed. At the same time, the PCB shape The accuracy of dimensions and specifications directly affect the manufacturability and economy of production and processing. The main contents of PCB outline design include:
(1) Aspect ratio design. The shape of the printed board should be as simple as possible, generally rectangular, with an aspect ratio of 3:2 or 4:3, and should be as close to the standard size as possible. Do not design the board surface too large, otherwise it will easily cause deformation during reflow soldering. The thickness of the board should also match the size of the board. For a thinner PCB, the board size should not be too large.
(2) PCB shape. The shape and size of the PCB are determined by the transmission mode and transmission range of the placement machine. When the PCB is positioned on the mounting workbench and the PCB is transmitted through the...
See more information
When designing a PCB, the first consideration is the shape of the PCB. When the size of the PCB is too large, the printed lines will increase, resulting in increased impedance and reduced noise immunity, and the cost will increase accordingly; if the size is too small, the heat dissipation will not be good, and adjacent lines will also be easily disturbed. At the same time, the PCB shape The accuracy of dimensions and specifications directly affect the manufacturability and economy of production and processing. The main contents of PCB outline design include:
(1) Aspect ratio design. The shape of the printed board should be as simple as possible, generally rectangular, with an aspect ratio of 3:2 or 4:3, and should be as close to the standard size as possible. Do not design the board surface too large, otherwise it will easily cause deformation during reflow soldering. The thickness of the board should also match the size of the board. For a thinner PCB, the board size should not be too large.
(2) PCB shape. The shape and size of the PCB are determined by the transmission mode and transmission range of the placement machine. When the PCB is positioned on the mounting workbench and the PCB is transmitted through the...
Why do PCBA circuit boards need to be cleaned
Why
Circuit board cleaning is often overlooked in the PCBA manufacturing process. Many PCBA manufacturers feel that this step is not very important. However, in the long-term use of the product, the problems caused by the ineffective cleaning of the PCBA in the early stage can easily lead to many failures and increase the cost of repair. The following Sanjing will take you to understand why PCBA circuit boards should be cleaned:
The PCBA production process will go through many process stages, and the degree of pollution at each stage is different. Therefore, many impurities are prone to remain on the surface of the PCBA circuit board. These pollutants will not only reduce the product performance, but may even cause the circuit board to fail. For example, solder paste or flux is used for auxiliary soldering during the soldering process. The residue produced after...
See more information
Circuit board cleaning is often overlooked in the PCBA manufacturing process. Many PCBA manufacturers feel that this step is not very important. However, in the long-term use of the product, the problems caused by the ineffective cleaning of the PCBA in the early stage can easily lead to many failures and increase the cost of repair. The following Sanjing will take you to understand why PCBA circuit boards should be cleaned:
The PCBA production process will go through many process stages, and the degree of pollution at each stage is different. Therefore, many impurities are prone to remain on the surface of the PCBA circuit board. These pollutants will not only reduce the product performance, but may even cause the circuit board to fail. For example, solder paste or flux is used for auxiliary soldering during the soldering process. The residue produced after...
How to carry out PCBA board reliability test
How
We know that the PCBA manufacturing process is extremely complicated. In addition to attaching importance to SMT chip processing, any material problems will have many collateral effects, which will affect the overall effect of the PCBA board. Therefore, in view of this situation, it is necessary to have sufficient material testing capabilities, supplier management capabilities, technical analysis capabilities, and reliability testing capabilities.
However, reliability testing is often ignored by PCBA processing manufacturers. Many times they will think that as long as the PCBA test is okay, in fact, many PCBA boards will have many problems in the terminal products, such as unstable performance and use. Short life, etc., therefore, PCBA reliability testing is an indispensable link. How should the PCBA reliability test be carried out? Let’s take a look at the following Sanjing:
(1) Aging test. Place the PCBA board with intact test functions under specific temperature and humidity conditions, perform repeated switch machine tests, simulated function operation, load operations, etc., and check the stability of the PCBA through...
See more information
We know that the PCBA manufacturing process is extremely complicated. In addition to attaching importance to SMT chip processing, any material problems will have many collateral effects, which will affect the overall effect of the PCBA board. Therefore, in view of this situation, it is necessary to have sufficient material testing capabilities, supplier management capabilities, technical analysis capabilities, and reliability testing capabilities.
However, reliability testing is often ignored by PCBA processing manufacturers. Many times they will think that as long as the PCBA test is okay, in fact, many PCBA boards will have many problems in the terminal products, such as unstable performance and use. Short life, etc., therefore, PCBA reliability testing is an indispensable link. How should the PCBA reliability test be carried out? Let’s take a look at the following Sanjing:
(1) Aging test. Place the PCBA board with intact test functions under specific temperature and humidity conditions, perform repeated switch machine tests, simulated function operation, load operations, etc., and check the stability of the PCBA through...
What are the advantages and disadvantages of SMT in PCB assembly
What
When preparing to design a printed circuit board, it is necessary to determine the surface mount and through-hole packaging of certain components. Compared with traditional through-hole components, SMT surface mount technology has many advantages, but there are also some disadvantages. The following Sanjing Let’s understand:
First of all, let's first understand the advantages of SMT surface mount:
①Automated assembly: Compared with manually assembled PTH parts, most SMT parts can be easily installed on the circuit board using automated pick-and-place equipment. High-capacity parts (such as passive parts) are loaded from the reel into the pick-and-place machine, while others Parts are loaded from tube feeders or pallets.
②The versatility of parts on PTH: SMT parts are usually smaller in size and volume than PTH parts, because there are no long leads that need to be inserted and soldered into the holes, so more components can be installed on a smaller board and then used...
See more information
When preparing to design a printed circuit board, it is necessary to determine the surface mount and through-hole packaging of certain components. Compared with traditional through-hole components, SMT surface mount technology has many advantages, but there are also some disadvantages. The following Sanjing Let’s understand:
First of all, let's first understand the advantages of SMT surface mount:
①Automated assembly: Compared with manually assembled PTH parts, most SMT parts can be easily installed on the circuit board using automated pick-and-place equipment. High-capacity parts (such as passive parts) are loaded from the reel into the pick-and-place machine, while others Parts are loaded from tube feeders or pallets.
②The versatility of parts on PTH: SMT parts are usually smaller in size and volume than PTH parts, because there are no long leads that need to be inserted and soldered into the holes, so more components can be installed on a smaller board and then used...
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