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Process for machining blind-drilled counter bore in high-density interconnection printed circuit board

A printed circuit board, high-density interconnection technology, applied in the direction of printed circuit, printed circuit manufacturing, electrical components, etc., can solve the problem of damage to the working table of the molding machine, failure to meet the requirements of the customer's loading accuracy, board fishing, etc. Problems such as poor quality, to reduce defective products and protect the work surface

Active Publication Date: 2013-10-16
GULTECH WUXI ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The depth of the blind fishing sink hole on the printed circuit board is uneven, which cannot meet the customer's requirements for the accuracy of the parts;
[0006] (2) The board has the risk of poor quality such as fishing through, and it will also damage the working surface of the molding machine

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: A processing technology for blind fishing counterbores on a high-density interconnection printed circuit board

[0018] A 4-layer printed circuit board, the thickness of the printed circuit board is 1.6mm, the area of ​​the blind fishing sink hole is 35×50mm, the depth of the blind fishing sink hole is 0.7±0.1mm, the diameter of the blind fishing pin hole program is 3.2mm, the blind fishing The diameter of the program milling cutter is 2.5mm, and the following production steps are used:

[0019] (1) Use a utility blade to scrape off the crater where the pin holes are drilled on the Bakelite board used to protect the working table of the molding machine;

[0020] (2) Replace the pressure foot brush on the blind fishing molding machine with a brush made of Teflon;

[0021] (3) Insert the drill bit used for drilling pin holes with a diameter of 3.1mm into the tool holder, start the blind fishing molding machine, and drill pin holes on the bakelite board on t...

Embodiment 2

[0025] Embodiment 2: A processing technology for blind fishing counterbores on a high-density interconnection printed circuit board

[0026] A 6-layer printed circuit board, the thickness of the printed circuit board is 1.6mm, the area of ​​the blind fishing sink hole is 65×50mm, the depth of the blind fishing sink hole is 0.8±0.1mm, the diameter of the blind fishing pin hole program is 3.2mm, the blind fishing The diameter of the program milling cutter is 2.5mm, and the following production steps are used:

[0027] (1) Use a milling cutter with a diameter of 3.175mm to flatten the entire bakelite board;

[0028] (2) Replace the pressure foot brush on the blind fishing molding machine with a brush made of Teflon;

[0029] (3) Insert the drill bit used for drilling pin holes with a diameter of 3.1mm into the tool holder, start the blind fishing molding machine, and drill pin holes on the bakelite board on the working table of the molding machine, with a drilling depth of 3±0.5...

Embodiment 3

[0033] Embodiment 3: A processing technology for blind fishing sink holes on a high-density interconnection printed circuit board

[0034] A 4-layer printed circuit board, the thickness of the printed circuit board is 1.6mm, the area of ​​the blind fishing sink hole is 35×50mm, the depth of the blind fishing sink hole is 0.7±0.1mm, the diameter of the blind fishing pin hole program is 3.5mm, the blind fishing The diameter of the program milling cutter is 1.0mm, and the following production steps are used:

[0035] (1) Use a utility blade to scrape off the crater where the pin holes are drilled on the Bakelite board used to protect the working table of the molding machine;

[0036] (2) Replace the pressure foot brush on the blind fishing molding machine with a brush made of Teflon;

[0037] (3) Insert the drill bit used for drilling pin holes with a diameter of 3.4mm on the tool holder, start the blind fishing molding machine, and drill pin holes on the bakelite board on the w...

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PUM

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Abstract

The invention relates to a process for machining a blind-drilled counter bore in a high-density interconnection printed circuit board. The process is characterized by comprising the following steps of: (1) if the area of the blind-drilled counter bore is less than 50*50 mm<2>, flattening a crater in which pin holes are drilled in a bakelite plate by using a cutter blade, and if the area of the blind-drilled counter bore is more than 50*50 mm<2>, flattening the whole plane of the bakelite plate by using a milling cutter; (2) replacing a pressure foot brush on a blind-drilling molding machine with a brush which is made of a polytetrafluoroethylene material; (3) inserting a drill bit which is used for drilling the pin holes into a cutter holder, starting the blind-drilling molding machine, and drilling the pin holes in the bakelite plate on a working table surface of the blind-drilling molding machine; (4) selecting four pins, and inserting the four pins into four pin holes in the bakelite plate, sleeving a printed circuit board, and then knocking in the pins; (5) fixing four edges of the printed circuit board; and (6) regulating blind-drilling depth, and machining the blind-drilled counter bore. By adoption of the process, the accuracy of the blind-drilled counter bore in the printed circuit board is guaranteed, the rate of defective products is reduced, and the working table surface of the blind-drilling molding machine can be effectively protected.

Description

technical field [0001] The invention relates to a process for mechanically processing blind sinking holes on a high-density interconnected printed circuit board, in particular to a process for blindly sinking sink holes on a printed circuit board by using a forming machine with a blind fishing function. technical background [0002] With the development trend of thinner, more integrated and multi-functional consumer electronic products, the requirements for the manufacturing process of printed circuit boards are getting higher and higher. Following this trend, printed circuit boards with blind fishing sink hole designs will gradually become an important part of various consumer electronics printed circuit boards. The high-density interconnection printed circuit board with blind fishing countersunk holes is to fish out countersunk grooves and countersunk holes of various shapes on the surface of the printed circuit board, and its function is to facilitate the packaging and fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K3/00
Inventor 孙守军
Owner GULTECH WUXI ELECTRONICS CO LTD
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