Drilling method for improving drilling accuracy of high-thickness-diameter PCB

Abstract

The invention discloses a drilling method for improving the drilling accuracy of a high-thickness-diameter PCB. The method comprises the following steps that a front side pre-drilling file, a front side resin drilling file, a reverse side pre-drilling file and a reverse side resin drilling file of the PCB are prepared; a pin hole is formed in the PCB edge according to the front resin drilling file, and the front side of the PCB is subjected to pre-drilling slotting process to form a front side pre-drilling hole according to the front pre-drilling file; the front side of PCB is subjected to drilling process according to the front side resin hole drilling file and the front side pre-drilling hole; a pin hole is formed in the PCB edge according to the reverse side resin drilling file, and thereverse side of the PCB is subjected to pre-drilling process to form a reverse side pre-drilling hole according to the reverse side pre-drilling file; and the reverse side of the PCB is subjected tothe drilling process according to the reverse side resin drilling file and the reverse side pre-drilling hole. A pre-drilling process is introduced, cutting force resistance produced in the resin drilling process is greatly reduced, and the yield of production quality is improved.

Description

Technical field [0001] The invention relates to a drilling technology, in particular to a drilling method for improving the drilling accuracy of a high-thickness PCB board. Background technique [0002] At present, with the rapid development of electronic products in the direction of miniaturization, high density, high integration and multi-function, the requirements for printed circuit boards are getting higher and higher, with high density, complex structure, and high Features such as layering, high thickness-to-diameter ratio, and small porosity In the current industry, the resin drilling process mainly includes two drilling methods: ordinary resin drilling and elongated drill vertical drilling. Among them, ordinary resin drilling is more common in the industry, and the length of ordinary drills is consistent with one-time drilling and printing. The condition of the board (general drill length-printed board thickness-aluminum sheet thickness (thickness is generally 0.2mm) ≥ 0...

AI Technical Summary

Problems solved by technology

The disadvantages of the method of lengthening the drill are: 1. During the process of clamping the drill 2, the drill spindle 1 will inevitably produce an offset angle α (the angle between the spindle centerline 3 and the drill tip), when the drill 2 The longer the length, the greater the offset angle α, and the worse the drilling accuracy (the position of the angle between the drill spindle 1 and the drill 2 is as follows figure 1 ); 2. After the main shaft of the drilling rig clamps the drill bit, the drill bit will rotate at a high speed. During the high-speed rotation and drilling process, it will contact the aluminum sheet 4 and the printed board 5 successively. It touches the aluminum sheet 4 and the printed board 5 At this time, a large cutting force resistance will be generated, which will cause the drill bit 2 to shift, resulting in the deviation of the drill hole 6 (the longer the length of the drill bit, the greater the offset), and ev

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