PCB assembly, the V-shaped dividing line between the two veneers and the veneers and the process edge, into a “V” shape;
After welding, it breaks off, so it is called V-CUT.

Purpose of V-cut
The main purpose of designing V-cut is to facilitate the operator to divide the board after the circuit board is assembled. When PCBA is divided, the V-Cut Scoring machine is generally used to cut the PCB in advance with V-shaped grooves. Scoring the round blade of Huai Scoring, and then push it hard, some machines have automatic board feeding design, as long as a button, the blade will automatically move and cut the board through the V-Cut position of the circuit board, the height of the blade It can be adjusted up and down to match the thickness of different V-Cuts.

Reminder: In addition to the Scoring of V-Cut, there are other methods for PCBA sub-board, such as routing, stamp hole, etc.

Although the V-Cut on the PCB can also be manually broken or broken at the position of the V-Cut, it is recommended not to manually break or break the V-Cut, because it will be affected by the force point when manually The PCB is bent, which can easily cause the electronic parts on the PCBA to crack, especially the capacitor parts, which will reduce the yield and reliability of the product. Some problems will gradually appear even after a period of use.

V-Cut design and use restrictions
Although V-Cut can facilitate us to easily separate the board and remove the board edges, V-Cut also has design and use restrictions.

1. V-Cut can only cut straight lines and cut to the end. That is to say, V-Cut can only cut into a line and cut straight from beginning to end. It cannot turn to change direction, nor can it cut a short section like a tailoring thread. Skip a short paragraph.

2. The PCB thickness is too thin and it is not suitable for V-Cut groove. Generally, if the thickness of the board is less than 1.0mm, V-Cut is not recommended. This is because the V-Cut groove will destroy the structural strength of the original PCB. , When there are heavy parts placed on the board designed with V-Cut, the board becomes easy to bend due to the relationship of gravity, which is very unfavorable for the SMT welding operation (easy to cause empty welding or short circuit).

3. When the PCB goes through the high temperature of the reflow oven, the board itself will soften and deform because the high temperature exceeds the glass transition temperature (Tg). If the V-Cut position and groove depth are not designed well, the PCB deformation will be more serious. , It is unfavorable for the secondary reflow process.

Angle definition of V-Cut
Generally speaking, V-Cut has three angles of 30°, 45° and 60° which can be defined. The most commonly used is 45°.

The greater the angle of the V-Cut, the more plates the edge of the board is eaten by the V-Cut, and the circuit on the opposite PCB must be more retracted to avoid being cut by the V-Cut or cutting the V -Damage when cut.

The smaller the angle of the V-Cut, the better the PCB space design theoretically, but it is not good for the life of the V-Cut saw blades of the PCB manufacturer, because the smaller the V-Cut angle, the more the blade of the electric saw. The thinner it is, the easier it is to wear and break its blade.