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How much do you know about PCB makeup?

May 5, 2021

      In PCB board copying, PCB design, and finally PCB mass production, PCB assembly is also a very important matter, which not only involves the quality standard of PCB circuit board, but also affects the cost of PCB production.

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      On the premise of ensuring the quality of PCB circuit board, how to make reasonable and effective board assembly, so as to save raw materials, is a problem that PCB board copying companies and PCB production companies pay great attention to solve.

PCB board process requirements:

      For irregular graphics, there will be gaps after the assembly board, and then the corners of both sides of the assembly board shall not be hollowed out (at least one side is not hollowed out), otherwise the positioning hammer of the SMT machine cannot be positioned, resulting in the inability to make patches.Please pay attention to the process requirements of PCB assembly, for double panels must pay attention to the pad through the metallization (PHT) and non-metallization (NPTH).

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  • The main content of PCB assembly specifications and standards:

  • 1、PCB assembly width ≤260mm (SIEMENS line) or ≤300mm (FUJI line);If automatic dispensing is needed, PCB assembly width × length ≤125mm×180mm.

  • 2、The shape of PCB board is as close to a square as possible, and it is recommended to use 2×2, 3×3,......Makeup;But don't make a yin-yang board.

  • 3、The outer frame (clamping edge) of PCB jigsaw should adopt closed-loop design to ensure that the PCB jigsaw will not be deformed after it is fixed on the fixture.

  • 4、The center distance between the small plates is controlled between 75mm and 145mm.

  • 5、There can be no large device or protruding device near the connection point between the outer frame of the assembly and the internal small plate, and between the small plate and the small plate, and the edge of the components and the PCB board should have a space greater than 0.5mm to ensure the normal operation of the cutting tool.

  • 6、Open four positioning holes in the four corners of the frame of the assembly board, with a diameter of 4mm±0.01mm;The strength of the hole should be moderate to ensure that it will not break in the process of upper and lower plates;Aperture and position precision to be high, smooth hole wall without burr.

  • 7、 Each small board in PCB assembly board shall have at least three positioning holes, 3≤ aperture ≤6mm, and no wiring or patch is allowed within 1mm of edge positioning holes.

  • 8、 used for PCB positioning of the whole board and used for fine-spacing device positioning of the reference symbol, in principle, spacing less than 0.5mm QFP should be set in its diagonal position;Positioning reference symbols for PCB subboards of assembly boards should be used in pairs and arranged at the diagonal of positioning elements.

  • 9、When setting the reference fixing point, an unhindered solder area 1.5mm larger than the fixed point is usually set aside around the fixing point.

  • 10、large components should have positioning column or positioning hole, such as I/O interface, microphone, battery interface, micro switch, headphone interface, motor, etc.

  • PCB jigsaw board other matters needing attention:

  • 1、PCB in the assembly should pay attention to the edge and slot

  •       The edges are left to provide a place for later welding of the plug-in or patch, and the grooves are to split the PCB board.The process requirements of edge retention are generally 2-4mm, and the components should be placed on the PCB board according to the maximum width.Slot is in the forbidden wiring layer or material layer, the specific agreement with the PCB manufacturer, processing, designers can mark it.PCB board is for the convenience of production, improve work efficiency, you can choose.

  • 2、 V groove and grooving are a way of milling shape

  •       Multiple boards can be easily separated to avoid damaging the circuit board during separation.Depending on the shape of the single type of board you are putting together, the V-Cut needs to go in a straight line and does not fit four types of boards of different sizes.

  • Makeup requirements:

  • 1、Generally, there are no more than 4 kinds of plates. The layers, copper thickness and surface process requirements of each plate are the same.

  • 2、jigsaw is to save costs, if the production process is more complex, large batch, it is recommended to produce separately, jigsaw also bear the reject rate of 10%-20%.

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