Drilling method capable of improving drilling precision

Abstract

The invention discloses a drilling method capable of improving drilling precision. The method comprises the following steps that a production plate is arranged on a drilling machine table board in analigned manner; an ultra-short edge drill bit is used for drilling a blind hole in the position, required to be subjected to through hole drilling, of a production plate, and the bottom of the blind hole is located in a medium layer below surface copper; the edge length of the ultra-short edge drill bit is smaller than the thickness of the production plate; a long edge drill bit with the same edgediameter the same as the ultra-short edge drill bit is used for continuously drilling downwards and drilling through the production plate on the basis of the blind hole, and a through hole is formed;the edge length of the long edge drill bit is larger than the thickness of the production plate; through the method, the drilling precision can be effectively improved through the two-time drilling manner, the drilling precision of a micro drill (the drill bit diameter is smaller than or equal to 0.3 mm) is improved to the maximum degree, and the drilling requirement with the drilling precision smaller than or equal to 2mil is met.

Description

technical field [0001] The invention relates to the technical field of printed circuit board production, in particular to a drilling method for improving drilling precision. Background technique [0002] With the development of printed circuit boards in the direction of miniaturization and high precision, the density of holes continues to increase and the distance between holes continues to decrease, resulting in higher and higher requirements for drilling accuracy. Drilling uses pins on the upper plate (pad board) of the drilling machine. Positioning, reducing the number of stacked boards and covering the circuit board with coated aluminum sheets to ensure the drilling accuracy; the above method uses one-time drilling through the circuit board when drilling, but for boards with a hole position accuracy requirement of ≤ 2mil, the current The drilling method cannot meet the requirements, and the use of coated aluminum sheets can improve the drilling accuracy, but the unit cos...

AI Technical Summary

Problems solved by technology

[0002] With the development of printed circuit boards in the direction of miniaturization and high precision, the density of holes continues to increase and the distance between holes continues to decrease, resulting in higher and higher requirements for drilling accuracy. Drilling uses pins on the upper plate (pad board) of the drilling machine. Positioning, reducing the number of stacked boards and covering the circuit board with coated aluminum sheets to ensure the drilling accuracy; the above method uses one-time drilling through the circuit board when drilling, but for boards with a hole position accuracy requirement of ≤ 2mil, the current The drilling method cannot meet the requirements, and although the use of coated aluminum sheets can improve the drilling accuracy, the unit cost is high, and it cannot meet the drilling requirements of the hole position accuracy ≤ 2mil