High-precision stepped crimping hole machining method
A processing method and technology of crimping holes, which are applied to the formation of electrical connections of printed components, reduction of greenhouse gases, electrical components, etc., can solve problems such as local open circuits, extremely poor board thickness, etc., to improve accuracy, reduce positioning point deviation, The effect of avoiding wasted space
Active Publication Date: 2021-02-26
AOSHIKANG TECH CO LTD
View PDF5 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Because the conventional back-drilling drill can cover the influence of the deviation of the drilling hole position, the main factors affected are the extremely poor thickness of the plate. After testing the section of the coupon, confirm that the stub is greater than the extreme difference of the plate thickness to ensure that there will be no risk of open circuit; but for the ladder Back drilling, in addition to extremely poor board thickness, there is also the risk of partial open circuits caused by hole deviation
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0032] The drilling process of the present invention is as follows:
[0033] "Xray punching - measurement of expansion and contraction - pin positioning - mechanical drilling through holes - controlled depth drilling - sinking copper - electroplating - testing electroplating PIN hole size - high precision size pin nails - back drilling".
[0034] The specific control is as follows: set the thickness of the plate as H, the diameter of the depth control drill as R, and the diameter of the back drill as R 1 ; The diameter of the small hole is r; the deviation of the back-drilling accuracy is σ 1 , the deviation between the wall of the back-drilled hole and the wall of the controlled-depth drilled hole (without copper) is σ 2 ; The copper thickness of the plated hole is b. The diameter of the first pin is d 1 ; The diameter of the second pin is d 2 .
[0035] Main control requirements:
[0036] (1)d 2 = d 1 -2b, the thickness of b is generally 20-25μm.
[0037] (2) The di...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a high-precision stepped crimping hole machining method, which comprises the following steps: 1, punching a positioning hole; 2, measuring expansion and shrinkage for the firsttime; 3, installing a first pin for positioning; 4, drilling a through hole through a machine; 5, carrying out depth control drilling to obtain a depth control drill hole, wherein the depth of the depth control drill hole is the depth of the target conduction layer, and the depth control drill hole is the inner diameter of the target through hole; 6, carrying out copper deposition; 7, electroplating; 8, electroplating the positioning hole to form an electroplated PIN hole, and testing the size of the electroplated PIN hole; 9, positioning through a second pin matched with the electroplating PIN hole and the electroplating PIN hole; and 10, carrying out back drilling to obtain a back-drilled hole. According to the method, the influence of positioning point position deviation is reduced, and the back drilling hole position precision is improved; the cutter diameter of the back drill hole only needs to be increased by 0.025 mm-0. 1 mm relative to the depth-controlled drill hole, so thatspace waste caused by the fact that the hole diameter of a conventional back drill is large is avoided; and the allowable deviation precision of the finished product hole position is smaller than thethickness of hole copper, and the crimping hole is ensured to be a through hole.
Description
Technical field: [0001] The invention belongs to the field of PCB board manufacture, in particular to a method for processing a high-precision stepped crimping hole. Background technique: [0002] With the development of 5G high-speed products, PCB is moving towards high density and high integration, especially the demand for high layer count, high wiring density and low stub (stub). The company proposes a method to increase the wiring density through stepped back drilling, through small holes and then controlled deep drilling, and then processing with a back drilling aperture equal to or slightly larger than the controlled depth drilling diameter; compared with conventional back drilling diameter Larger than through holes result in a waste of space. [0003] For example, a 0.4mm through hole is used as an example. Conventionally, a 0.4mm drill is used, and a layer of copper is plated on the hole wall by sinking copper and electroplating; in order to control the stub, it is...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H05K3/00H05K3/42
CPCH05K3/0047H05K3/42Y02E30/30
Inventor 范红黄勇李亚军李军
Owner AOSHIKANG TECH CO LTD