Drilling method for printed circuit board (PCB)

Abstract

The invention provides a drilling method for a printed circuit board (PCB). The method comprises the following steps of: 1, providing a PCB to be drilled, and determining drilling depth of a front surface and drilling depth of a back surface according to the thickness of the PCB; 2, providing a cover plate and a drilling cutter, and determining the length of a blade of the drilling cutter according to the drilling depth of the front surface and the drilling depth of the back surface of the PCB and the thickness of the cover plate; 3, determining a coordinate system for drilling on the front surface of the PCB, drilling positioning holes on the front surface of the PCB, arranging the cover plate on the front surface of the PCB and fixing the PCB and the cover plate respectively; 4, drilling through the cover plate by using the drilling cutter, drilling from the front surface of the PCB to form a half hole according to the drilling depth of the front surface of the PCB, and then feeding the PCB; 5, inverting the PCB, determining a coordinate system for drilling on the back surface of the PCB, drilling positioning holes on the back surface of the PCB, arranging the cover plate on the back surface of the PCB and fixing the PCB and the cover plate respectively; and 6, drilling through the cover plate by using the drilling cutter, drilling from the back surface of the PCB to be communicated with the half hole to form a through hole according to the drilling depth of the back surface of the PCB, and feeding the PCB. In the method, a short-blade long drilling cutter is used for drilling from the two ends of the front surface and the back surface of the hole respectively, so a thicker PCB can be drilled through; and the method has the advantages of lower cost, higher drilling position accuracy and difficulty in breaking the cutter.

Description

technical field [0001] The invention relates to the technical field of printed circuit boards (PCB: Printed circuit board), and in particular, to a method for drilling holes on a PCB board. Background technique [0002] In the process of making a PCB circuit board, it is often necessary to drill several holes with different diameters on the PCB board for component jacks or conduction. At present, the drilling process of PCB board is to use a drill to drill completely from one side of the PCB board to the other side. In this method, when the PCB board reaches a certain thickness, limited by the length of the drill blade, the PCB board cannot be drilled. through. Furthermore, when the PCB board is thickened, the length of the drill blade will also increase accordingly, and the drilling of the long-blade knife will be more difficult to manufacture, resulting in an increase in the procurement cost of the drill. Further, as the length of the drill blade increases, the rigidity ...

AI Technical Summary

Problems solved by technology

At present, the drilling process of the PCB board is to use a drill to completely drill through the PCB board from one side to the other. However, when the PCB board reaches a certain thickness, the PCB board cannot be drilled due to the limitation of the length of the drill blade. through

Furthermore, when the PCB board becomes thicker, the blade length of the drill will also increase accordingly, making it more difficult to manufacture holes with long blades, resulting in an increase in the purchase cost of the drill

Further, as the length of the drill edge increases, the rigidity of the drill decreases, and under the action of the mechanical impact between the drill and the semi-finished PCB board to be processed, the deformation of the drill increases, which easily leads to a Decreased precision, increased chance of tool interruption during drilling

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