In order to facilitate the production and manufacture, PCBpcb circuit board jigsaw generally must design the Mark point, V-groove, and processing edge.
PCB appearance design
1. The frame (clamping edge) of the PCB splicing method should adopt a closed-loop control design scheme to ensure that the PCB splicing method is not easily deformed after being fixed on the fixture.
2. The total width of PCB splicing method is ≤260Mm (SIEMENS line) or ≤300mm (FUJI line); if automatic gluing is required, the total width of PCB splicing method is 125mm × 180mm.
3. The appearance design of the PCB boarding method is as close to the square as possible, and it is strongly recommended to use 2×2, 3×3, … and the boarding method; but it is not necessary to spell out the positive and negative boards;
pcbV-Cut
1. After opening the V-cut, the remaining thickness X should be (1/4～1/3) the plate thickness L, but the minimum thickness X must be ≥0.4mm. Restrictions are available for boards with heavy loads, and lower limits are available for boards with lighter loads.
2. The displacement S of the wound on the left and right sides of the V-cut should be less than 0 mm; because of the minimum reasonable thickness limit, the V-cut splicing method is not suitable for the board with the thickness less than 1.3mm.
Mark point
1. When setting the standard selection point, generally vacate an unobstructed non-resistance area 1.5 mm larger than the periphery of the selection point.
2. Used to assist the electronic optics of the smt placement machine to accurately locate the top corner of the PCB board with chip components. There are at least two different measurement points. The measurement points for the accurate positioning of a whole PCB are generally in one piece. The relative position of the top corner of the PCB; the measurement points for precise positioning of the layered PCB electronic optics are generally at the top corner of the layered PCB pcb circuit board.
3. For components of QFP (square flat package) with wire spacing ≤0.5 mm and BGA (ball grid array package) with ball spacing ≤0.8 mm, in order to improve the precision of the chip, it is specified to set at the two top corners of the IC Measuring point.
processing technology side
1. The border between the frame and the internal main board, the node between the main board and the main board should not be large or overhanging, and the edge of the electronic device and the PCBpcb circuit board should leave more than 0.5 mm of indoor space. To ensure the normal operation of laser cutting CNC blades.
Precise positioning holes on the board
1. It is used for precise positioning of the entire PCB circuit board of the PCBpcb circuit board and standard marks for precise positioning of fine-spaced components. Under normal circumstances, the QFP with an interval of less than 0.65mm should be set at its top corner; The precise positioning standard marks of the PCB daughter board of the board should be applied in pairs and laid out at the top corners of the precise positioning factors.
2. Precise positioning posts or precise positioning holes should be reserved for large electronic components, such as I/O jacks, microphones, rechargeable battery jacks, toggle switches, earphone jacks, motors, etc.
A good PCB designer should take into account the elements of production and manufacturing when developing the puzzle design plan to ensure convenient production and processing, improve productivity, and reduce product costs.
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