Half hole size range: diameter ≥0.6MM, hole edge to hole edge ≥0.6MM (single welded ring 0.127mm or more, less than this parameter will be optimized). At this point some people will ask what is a half hole plate?
Metal half hole (slot) definition, a drilling hole through the hole and then two drilling, shape process, and ultimately retain the metalized hole (slot) half, simply said is the plate edge metalized hole cut half, plate edge semi-metalized hole process in the plate technology processing has been a very mature process.
How to control the quality of the product after the molding of semi-metallized edge holes. Such as the hole wall copper spines up, residual has been a difficult problem in the process of processing.
This kind of board edge has a whole row of semi-metallized holes of the PCB, which is characterized by a relatively small aperture, mostly used on the carrier board, as a mother board, through these semi-metallized holes and the mother board and components of the pin welded together.
Therefore, if there are copper spikes left in these semi-metallic holes, when welding by the plug-in manufacturer, it will lead to weak welding feet, virtual welding, and serious short circuit in the bridge between the two pins.
Whether drilling or milling, the rotation direction of the SPINDLE (spindle) is clockwise. When the tool is processed to point A, the metallized layer of the hole wall at point A is closely connected with the substrate layer to prevent the extension of the metallized layer during processing and the separation of the metallized layer from the hole wall. It will also ensure that there will be no copper spikes and residues after processing here; When the tool is processed to point B, because the copper attached to the hole wall does not have any (Figure 1) adhesion support, when the tool runs forward, the metalized layer in the hole will curl with the direction of the tool rotation under the influence of external forces, resulting in copper spikes and residues.
In the design, the half hole should be placed in the inner (hanging copper) area of the plate frame line as far as possible. It is larger than the empty area, and it is often encountered that the half hole drawn by the customer is not standardized, only a third of the hole is in the plate, this design is unable to meet the production process, and at least the welding pad has to be equal to the plate frame line.
It is emphasized here that the one-half orifice plate has one side, two sides, three side half holes, and four side half holes. The half-hole welding pad to the four corners must be guaranteed to be at least 2MM above (Figure 2), which is used as a clip to connect the plate. Our company in the milling (forming) half hole plate left and right will exceed the half hole of a knife, so the board connection is smaller.
In this recommendation, it is best not to make the half-hole plate, if you must make the plate all around to add (1.6-2.0) MM spacing, but also to add the process side shipment, half-hole plate can not be made with other plates, the order must be specially noted.
Half hole plate to increase the cost of the reason: half hole is a special process, in order to ensure that there is copper in the hole, it must be done half of the process when the gong edge, and the general half hole plate is very small, so the general cost of half hole plate is relatively high, unconventional design unconventional price.
1. V cutting plate, the edge of the half hole plate is not V cutting forming (will pull the copper wire, resulting in no copper in the hole)
2. Stamp hole spelling:
PCB assembly methods are mainly V-CUT, bridge, bridge stamp hole these ways, the size of the assembly can not be too large, can not be too small, generally small board can be assembled processing or convenient welding and assembly.
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