Manufacturing method for eliminating burrs and copper sheet rolling of PTH semi-hole plate

Abstract

The invention discloses a manufacturing method for eliminating burrs and copper sheet rolling of a PTH semi-hole plate. The method comprises the following steps of S1, carrying out the secondary drilling of a PTH semi-hole, and enabling the secondary drilling to intersect with the PTH semi-hole, S2, conducting CNC processing, and S3, carrying out etching and tin stripping treatment on the PCB. The secondary drilling is carried out beside the PTH hole, and the copper foil connected with the metalized half hole is cut off through the secondary drilling, so that the hole copper of the metalized half hole needing to be removed is stripped from the part needing to be reserved, and burrs during forming are reduced.

Description

technical field [0001] The invention relates to the technical field of circuit processing, in particular to a manufacturing method for eliminating burrs on a PTH half-hole plate and copper wrapping. Background technique [0002] The printed circuit board (PCB board) is processed into some conductive patterns on an insulating board of a certain size, and is equipped with holes (such as component socket holes, fastening holes, metallized holes, etc.), and its chassis, A wiring board that enables interconnection between components. There are PTH holes, NPTH holes and PTH half holes on the PCB, which are respectively: PTH holes, PlatingThroughHole refers to plating holes (also called plug-in holes); NPTH holes, Non-PlattingThroughHole refers to non-plating holes; PTH half holes, also known as stamps Type plated semicircle hole, the semicircle hole is like a pin lead, you can directly solder the metallized semicircle hole to the surface pad of another printed circuit board with ...

AI Technical Summary

Problems solved by technology

However, the copper attached to the hole wall is malleable and tough. When the gong knife cuts the copper-based metallization layer on the hole wall, it will have a drape residue due to the following reasons: 1. The gong knife has insufficient rotation speed. 2. The bonding force between the hole copper and the hole wall is insufficient, and the hole copper near the fracture is detached under the action of shear force; 3. The ductility of the hole copper, especially the hot air After surface treatment such as flat or immersion gold, the thickness, ductility and toughness of the metal layer are increased, resulting in continuous cutting

[0004] During the PTH half-hole forming process, due to the above reasons, the copper skin is lifted and the remaining edge is left. It has always been a difficult problem in the machining of PCB boards.

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