Technical
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Disassembly Skills of Chip Components on PCB
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Testing Techniques for Common Electronics Components
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Black Oxidation of the Inner Layer of the Multilayer PCB
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How PCBA Is Packaged and Shipped
How long can PCBA finished products be stored?
What Are the Differences and Relations Between PCB, PCBA, and SMT?
PCB Baking Specifications
PCB "Solder Mask Tenting" and "Solder Mask Opening"
Five reasons for PCB deformation and six solutions
Importance of first article inspection of PCBA board
Temperature zone standard for SMT reflow soldering
Small and medium volume PCB manufacturers in China
The main reason for PCBA cleaning
For power filter, the more capacitors, the better?
What does PCBA programming mean?
Content of PCB incoming testing
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What is Blind via and Buried via
PCBA Manufacturers Temperature and Humidity Sensitive Components Management
Why choose Shenzhen SMT processing factory?
How long does it take to calculate the quotation for PCBA manufacturing?
Introduction of PCB design clearance requirements
Explanation of BOM, DIP, SMT, SMD
Introduction of the process of PCBA prototype
How to prevent pseudo soldering or cold soldering defects in PCBA manufacturing?
Factors that affect the Price of FPCB
What information is required for SMT processing at PCBA factory?
Skills of using 0ohm resistor in PCB design
How to select a PCBA manufacturer
SMT processing solder joint quality inspection
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A Few Rules about PCB Panelization
Compare of multi-layer PCB with single/double layer PCB
Why do we need to introduce so many subdivided GND
Difference between immersion gold boards and gold plating boards
Aluminum PCB structure
Classification of different GND in circuit
Why PCB baking is necessary during manufacturing process
The handle and precautions of OSP board in SMT process
How to choose capacitors for filter decoupling
How to choose filter capacitor for switching power supply
5 database need for SMT process
Function of three-terminal capacitor
Introduction of PCB OSP surface treatment
Method of inspecting the quality of SMT by step
How to find the short point between VCC and GND
Difference between 850nm and 940nm infrared LED
Component layout of PCB SMT DFM
Pad shape influence on the strength and reliability of the soldering joints
The difference between high temperature solder paste and low temperature solder paste
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Manual visual inspection in PCBA processing
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Difference between hardware engineers and software engineers
PCBA processing operation rules
China PCB upstream materials has continued to soar
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The key points of quality control in PCBA processing
Common causes of solder beading during SMT process
Analysis of the advantages and disadvantages of HASL PCB surface
Requirements for layout of components during SMT assembly
Selection of electronic components and CCL for PCBA
Performance and appearance quality inspection of components.
Quality and Reliability of SMT Chip Processing and Production
Coupling and decoupling function of capacitor
Two methods to connect digital ground and analog ground
Common sense in SMT process

Five reasons for PCB deformation and six solutions

With the continuous development of surface mount technology in the direction of high precision, high speed, and intelligentialize, there are also higher requirements for the flatness of PCB boards. PCB board deformation is a very troublesome thing for many PCB assembly factories. Today, China PCB manufacturer SYS Technology will share with you some reasons and solutions for PCB board deformation.

The reasons for the deformation of the PCB board are:
 
1. When the circuit board is designed, the copper is unevenly distributed and warped after compressing.
2. The circuit board is impacted by the external heat and cold, causing sudden cooling and heating.
3. The quality of the circuit board raw material is poor.
4. The size of the panel is too large.
5. The circuit board profile is irregular.

The solutions given for the causes of PCB board deformation are:
 
1. Lower the reflow soldering temperature
Temperature is the main source of PCB board internal stress. As long as you lower the temperature of the reflow oven or slow down the heating and cooling speed of the circuit board in the reflow oven, the occurrence of board bending and board warping can be greatly reduced.

2. Use high TG CCL
TG value is the temperature at which the material changes from the glass state to the rubber state. The lower the TG value, the faster the circuit board starts to soften after entering the reflow oven, and the time it takes to become soft rubber state will be shorter. Of course, the deformation of the circuit board will be more serious, and the use of a higher TG CCL can increase its ability to withstand stress and deformation. 

3. Increase the thickness of the PCB board
If there is no requirement for lightness and thinness, it is best to use a thickness of 1.6mm for the PCB board, which can greatly reduce the risk of bending and deformation of the board.

4. Reduce the size of the PCB board and the number of PCB in each panel
Most of the reflow ovens use chains to drive the PCB board forward. Try to put the long side of the PCB board as the board edge on the chain of the reflow oven, which can reduce the depression and deformation caused by the weight of the PCB board itself. The decrease in panelization number is also based on this reason. That is to say, when passing the oven, try to use the narrow side perpendicular to the direction of the oven to achieve the lowest depression deformation.

5. Use tray fixture during reflow soldering
Whether it is thermal expansion or cold contraction, the tray can hold the PCB board and wait until the temperature of the board is lower than the TG value and start to harden again, and it can still maintain the original size.
If a single-layer tray cannot reduce the deformation of the PCB board, add a tray as lid to hold the PCB board with the upper and lower two layers trays, so that the problem of PCB board deformation through the reflow oven can be greatly reduced.

6. Use real connections and stamp holes instead of V-Cut to connect boards
Since V-Cut will destroy the structural strength between the PCB boards, try not to use the V-Cut in panel arrangement, or reduce the depth of the V-Cut.

Supplementary instruction:
In the automated surface mounted line, if the PCB board as the basement of various components is not flat, it will cause inaccurate positioning, the components cannot be inserted or mounted precisely on the holes or surface mounted pads of the circuit board. In severe cases, the automatic insertion machine may be damaged.