Manufacturing method of mechanical large hole of printed circuit board

Abstract

The invention provides a method for manufacturing a mechanical large hole in a printed circuit board, comprising: step S1, according to the size of the large hole in the product preset requirements, designing a plurality of small holes with diagonal shapes inside the large hole to expand the hole, Thereby determine the matching small hole size; step S2, after determining the small hole size, the small holes are combined, and then the center point of the included angle of the plurality of small holes is used as the center of the circle to design the preset required size hole, wherein the edge of the small hole is a certain distance compensation amount from the inner side of the large hole; step S3, export the computer numerical control program according to the design determined in step S2, and input the computer numerical control program into the numerical control mechanical drilling machine, and the numerical control mechanical drilling machine according to The computer numerical control program first uses the drill bit with the same diameter as the small hole to ream the small hole, and then uses the drill bit with the same diameter as the large hole to make the large hole, so as to generate a large hole with a preset required diameter. The invention reduces the phenomenon of drill breakage and improves production efficiency.

Description

technical field [0001] The invention relates to the field of printed circuit boards (PCBs), in particular to a method for manufacturing large mechanical holes of printed circuit boards. Background technique [0002] Today, with the rapid development of printing technology, printing has developed from a single, double-sided, multi-layer, high-density interconnection direction. Micro-circuits, micro-holes, and super-large mechanical through-holes have become synonymous with today's high-end printing field. [0003] Mechanical through holes are an indispensable part of the electrical conduction function of the printed board. During the printing process, they are realized by high-strength cutting drills and high-speed CNC mechanical drilling machines. In printing, the diameters of mechanical drilled holes are different. For mechanical through holes with a diameter of less than 4mm (called small holes in the industry), it can be realized by processing a drill bit with a correspon...

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention is that the drill tip is easily broken during the processing of the mechanical large hole of the printed circuit board, which makes the drilling quality poor and the processing efficiency reduced

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