The harm of PCB board deformation

2023-03-21 16:36

In the automatic surface mount line, if the circuit board is not flat, it will cause inaccurate positioning, components cannot be inserted or mounted on the holes and surface mount pads of the board, and even the automatic plug-in machine will be damaged. The circuit board with components is bent after welding, and the component feet are difficult to cut flat and tidy. The board cannot be installed on the chassis or the socket in the machine, so it is also very troublesome for the assembly factory to encounter the board warping. At present, the surface mount technology is developing in the direction of high precision, high speed and intelligence, which puts forward higher flatness requirements for the PCB board as the home of various components. In the IPC standard, it is specifically pointed out that the allowable deformation of PCB board with surface mount devices is 0.75, and the allowable deformation of PCB board without surface mount is 1.5. In fact, in order to meet the needs of high-precision and high-speed mounting, some electronic assembly manufacturers have stricter requirements on the amount of deformation. If there is a requirement, the allowable amount of deformation is 0.5, and even some individual requirements are 0.3.

The PCB board is composed of copper foil, resin, glass cloth and other materials. The physical and chemical properties of each material are different. After being pressed together, thermal stress will inevitably occur and cause deformation. At the same time, in the process of PCB processing, it will go through various processes such as high temperature, mechanical cutting, wet treatment, etc., which will also have an important impact on the deformation of the board. In short, the reasons that can lead to the deformation of the PCB board are complex and diverse. How to reduce or eliminate the deformation caused by different material properties or processing has become one of the complex problems faced by PCB manufacturers.

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