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Regarding the panelization issue in PCB manufacturing.
Release time:
2013-12-30 10:14
First, let’s talk about panelization. As we all know, the primary challenge in panelization is to reduce production costs. For PCB panel widths ≤260mm to 300mm, the specific requirements vary depending on the production line. Since we may have a large variety of materials, and each processing machine typically uses one material gun per module, if the panel size exceeds the module’s capacity, the processing speed will slow down dramatically.
The outer frame (clamping edge) of the PCB panel should be carefully designed to ensure that the PCB panel does not deform once it is secured in the fixture. (Generally, V-grooves are not allowed on this edge.) Regarding component placement, first, all components must face the same direction; mirror-image arrangements are strictly prohibited, as they can lead to coordinate positioning issues during processing.
Second, no connectors should protrude at the edges (between the outer frame of the panel and the inner subpanels, as well as between subpanels themselves). If such protrusions exist, they will interfere with the blade separation process after soldering is complete.
To ensure the position and levelness of the inspection board, we need to set up more than three positioning points along the board’s edges. By optically detecting these three points, we can obtain the reference coordinates for the entire machining process as well as the board’s levelness.
The correct practice is to maintain a 5-mm clearance from the edge and to use different spacing when the directions of travel are not aligned (to facilitate distinguishing the entry direction): [When setting reference positioning points, it is customary to leave an unfilled solder mask area around the positioning point that is 1.5 mm larger than the point itself; no similar pads or other similar features should be present.]
Each small board must have at least three positioning holes, with a hole diameter ranging from 3 to 6 mm. Wiring or component placement is not allowed within 1 mm of the edge-positioning holes (to prevent misjudgment).
PCB panelization primarily helps to reduce production and processing costs (and can increase machine processing speeds by several times). An unreasonable design, however, can lead to numerous problems down the line. Therefore, it’s crucial to carefully consider the design in conjunction with SMT processing equipment to prevent potential issues.
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