PCB Assembly Rules And Methods PCB Assembly Tutorial Tips Shared

Publish Time: January 05,2019

Appearance design of PCB assembly board

1. Closed-loop control design should be adopted for the frame (clamping edge) of PCB assembly mode to ensure that it is not easy to deform after the PCB assembly mode is fixed on the fixture.

2. The total width of PCB assembly is ≤260Mm (SIEMENS line) or ≤300mm (FUJI line);If automatic gluing is required, the total width × length of PCB assembly shall be ≤125 mm ×180mm.

3. The appearance design of PCB assembly is as close to the square as possible. 2×2, 3×3 and...... are highly recommended.Jointing method;But do not have to spell out Yang Yin plate;

Ii. PcbV slot

1. After opening the V-groove, the remaining thickness of X shall be (1/4 ~ 1/3) plate thickness L, but the minimum thickness of X shall be ≥0.4mm.The heavy load of the board can be limited, the weight of the lighter board can be used low limit.

2. The displacement S of the wounds on the left and right sides of the V-groove should be lower than 0.mm;Because at least reasonable thin thickness of the limit, for the thin thickness of less than 1.3mm board, it is not suitable to choose V groove assembly method.

Three, Mark the point

1. When setting the standard selection point, a 1.5 mm unimpeded welding zone is generally left around the selection point.

2, used to assist SMT placement machine electronic optical precision positioning has patch type components of PCB apex Angle at least two different survey points, a whole piece of PCB electron optical precision positioning using measurement point in a single piece of PCB apex Angle relative parts;The measurement points used for the precision positioning of layered PCBpcb are generally located in the relative position of the top Angle of layered PCBpcb.

3. For QFP components with wire spacing ≤0.5 mm (square flat package) and BGA components with ball spacing ≤0.8 mm (ball grid array package), in order to improve SMT type precision, it is stipulated to set measurement points at IC two top angles.

Four, processing technology edge

1, the board frame and the internal motherboard, the motherboard and the motherboard between the nodes around the periphery can not be too large components or overhanging components, and electronic devices and PCBpcb circuit board edge should be set aside more than 0.5 mm indoor space, to ensure that the laser cutting CNC blade all normal operation.

5. Precise positioning of holes on the board

1. Standard mark for accurate positioning of the whole PCB PCB board and for precise positioning of finely spaced components. Under normal circumstances, QFP with an interval lower than 0.65mm should be set at its top Angle;Standard markers for precise positioning of PCB subboards should be used in pairs and arranged at the top Angle of precise positioning factors.

A good PCB designer should take production and manufacturing factors into consideration when developing the board design scheme, so as to ensure convenient production and processing, improve productivity and reduce product cost.