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Method for drilling high-precision large-aperture hole in printed board

A hole processing method and large-aperture technology, applied in the field of aperture processing, can solve the problems of large load resistance of the drill bit, large drilling error, serious drill bit shaking, etc., and achieve the effect of improving precision and product quality

Active Publication Date: 2014-05-14
KUNSHAN SUHANG CIRCUIT BOARD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the different expansion and contraction coefficients of materials, and when drilling large-diameter holes, the load resistance on the drill bit is large, and the drill bit shakes seriously, resulting in large drilling errors, and its processing accuracy can reach ±0.2mm at most.
For some printed boards with special installation requirements, such as printed circuit boards for automobiles, etc., when the aperture accuracy requirement is ≤±0.075mm, or ±0.05mm, the existing drilling methods cannot meet the aperture requirements. Accuracy requirements

Method used

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  • Method for drilling high-precision large-aperture hole in printed board
  • Method for drilling high-precision large-aperture hole in printed board
  • Method for drilling high-precision large-aperture hole in printed board

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Such as figure 1 As shown, a large-aperture hole 2 with a diameter of 6.0 mm is drilled on a printed board 1, and the straight drilling method is used: first, the position of the large-aperture hole to be drilled on the printed board is located at the position of the large-aperture hole On the midpoints of the three radiuses that form an angle of 120 degrees with each other, drill a first guide hole 3 respectively. The diameter of the first guide hole is 2.0mm; Drill the hole. When selecting a drill bit, you can choose according to the expansion and contraction coefficient of the material. If the expansion and contraction coefficient of the material is greater than 1, choose a drill bit that is slightly smaller than the diameter of the large hole to be drilled. The drill bit with a large aperture and a slightly larger diameter is to be drilled, which just compensates for the error caused by the expansion and contraction of the material and improves the drilling accurac...

Embodiment 2

[0023] Drill a large-aperture hole 2 with a diameter of 9.0mm on a printed board, using the expansion drilling method: first drill a second guide hole 4 at the center of the large-aperture hole 2 to be drilled, and then drill the second guide hole 4 Drill several reaming holes 5 at intervals between the large aperture hole 2 to be drilled, and the diameter of the reaming hole is 1 / 3 of the large aperture hole to be drilled, i.e. 3.0mm, wherein the diameter of the second guide hole is according to the formula : Calculated by D-2d+0.1mm, where D is the diameter of the large hole to be drilled, and d is the diameter of the expanded hole. Through calculation, the diameter of the second guide hole is 3.1 mm. The expansion drilling method firstly drills the second guide hole, and then drills and expands the hole to finally form the required large-diameter hole. The drilling process reduces the load resistance and reduces the shaking and swing of the drill bit during drilling, thus b...

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Abstract

The invention discloses a method for drilling a high-precision large-aperture hole in a printed board. When the diameter of the large-aperture hole is larger than and equal to 3.0 millimeters and is smaller than and equal to 6.5 millimeters, a straight drilling method is adopted. When the diameter of the large-aperture hole is larger than 6.5 millimeters, a counterbore drilling method is adopted. The straight drilling method includes the steps of firstly drilling three first pilot holes on three 120-degree-angle radiuses of the large-aperture hole to be drilled, and then drilling the large-aperture hole with the required diameter by using a drill bit with the center of the large-aperture hole to be drilled as the circle center, wherein the centers of the three first pilot holes coincide with the midpoints of the radiuses where the three first pilot holes are located on respectively. The counterbore drilling method includes the steps of firstly drilling a second pilot hole in the center of the large-aperture hole to be drilled, then drilling a plurality of counterbores between the periphery of the large-aperture hole to be drilled and the second pilot hole, and finally obtaining the large-aperture hole. According to the method for drilling the high-precision large-aperture hole in the printed board, the different drilling methods are adopted according to the aperture range of the large-aperture hole to be drilled, so the drilling accuracy is greatly improved, the requirements of the printed boards for the drilling accuracy are met, and the quality of the printed boards is promoted.

Description

technical field [0001] The invention relates to an aperture processing method, in particular to a high-precision large-diameter hole processing method for a printed board. Background technique [0002] During the processing of printed boards, it is often necessary to process large-diameter holes to install and fix printed boards. The processing of the large-aperture hole generally adopts a drilling machine to directly drill, and the diameter of the drill bit of the drilling machine is consistent with the diameter of the large-aperture hole to be drilled. However, due to the different expansion and contraction coefficients of the materials, and when drilling large-diameter holes, the load resistance on the drill bit is large, and the drill bit shakes seriously, resulting in large drilling errors, and its machining accuracy can reach ±0.2mm at most. For some printed boards with special installation requirements, such as printed circuit boards for automobiles, etc., when the a...

Claims

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Application Information

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IPC IPC(8): B23B35/00
CPCB23B35/00
Inventor 倪蕴之朱永乐陈蓁
Owner KUNSHAN SUHANG CIRCUIT BOARD
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