CN111800949A - Method for back drilling resin plug hole and aluminum sheet screen - Google Patents
Method for back drilling resin plug hole and aluminum sheet screen Download PDFInfo
- Publication number
- CN111800949A CN111800949A CN202010788101.5A CN202010788101A CN111800949A CN 111800949 A CN111800949 A CN 111800949A CN 202010788101 A CN202010788101 A CN 202010788101A CN 111800949 A CN111800949 A CN 111800949A
- Authority
- CN
- China
- Prior art keywords
- hole
- aluminum sheet
- back drilling
- resin
- screen printing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/0094—Filling or covering plated through-holes or blind plated vias, e.g. for masking or for mechanical reinforcement
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/095—Conductive through-holes or vias
- H05K2201/0959—Plated through-holes or plated blind vias filled with insulating material
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/02—Details related to mechanical or acoustic processing, e.g. drilling, punching, cutting, using ultrasound
- H05K2203/0214—Back-up or entry material, e.g. for mechanical drilling
Abstract
The invention discloses a method for back drilling resin hole plugging, which relates to the production of circuit boards and mainly solves the technical problem that the hole opening of a back drilling hole cannot be plugged fully. The invention also discloses an aluminum sheet screen printing plate applied to back drilling of the resin plug holes. According to the invention, when the back drilling hole is plugged, the resin is in a conical state with a large lower part and a small upper part, and when the screen plate is lifted, the center of gravity of the resin gathered at the hole opening of the back drilling hole is at the lower part of the cone and cannot be lifted by the screen plate, so that the hole plugging of the resin can reach 100%, and the problem of resin sinking without a hole is solved.
Description
Technical Field
The invention relates to circuit board production, in particular to a method for back drilling resin plug holes and an aluminum sheet screen.
Background
Resin plugging of the back drilling plate is one of the processes of the prior printed circuit board. The process flow is as follows: drilling a hole plugging aluminum sheet to manufacture a hole plugging screen plate and a base plate, wherein the hole plugging screen plate and the base plate are arranged on a hole plugging machine, and hole plugging, baking and curing are carried out, and a resin grinding plate is ground.
As shown in figure 1, a traditional aluminum sheet is provided, a drill bit with a diameter larger than that of a hole to be plugged is used for drilling a straight hole B on an aluminum sheet A, and the drilled aluminum sheet A is stuck on a screen printing plate to form the hole plugging aluminum sheet.
At present, the hole diameter of an aluminum sheet corresponding to a back drilling hole is large, so that the situation that the ink in the hole opening of the back drilling hole is brought up when a screen printing plate is lifted up in actual production can occur, and the hole opening of the back drilling hole cannot be plugged fully. According to statistics, the traditional method is used for plugging holes, and the holes of the back drilling holes with the proportion of about 5% -10% on the PCB can not be plugged and are full. The failure of full hole plugging of the hole opening can affect the stability of the circuit board in long-term work and the service life, for example, under the harsh conditions of high strength (temperature or use frequency) and the like, problems are easy to occur, equipment failure is caused, the guarantee period (such as 5 years) can not be met, and therefore the requirement of a customer on the product quality can not be met. The back drilling holes are small in aperture and large in number, so that great difficulty is brought to later detection and hole filling.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art, and aims to provide a method for plugging holes in back-drilled resin, which can ensure that the holes are full.
The invention also aims to provide an aluminum sheet screen printing plate applied to back drilling of resin plug holes.
In order to achieve the above object, the present invention provides a method for back drilling resin hole, which forms resin into a tapered state with a large bottom and a small top when hole is plugged into a back drilling hole, and then separates a hole plugging screen plate from a PCB.
As a further improvement, the taper angle of the taper state is 120 ° to 165 °.
Further, the taper angle of the tapered state is 135 °.
In order to achieve the second purpose, the invention provides an aluminum sheet screen plate applied to back drilling resin plug holes, which comprises an aluminum sheet, wherein the aluminum sheet is provided with tapered holes corresponding to back drilling holes, the tapered holes are of a structure with a small upper end and a large lower end, and the diameter of the upper ends of the tapered holes is larger than that of the back drilling holes.
As a further improvement, the diameter of the upper end of the conical hole is 0.1-0.3 mm larger than that of the back drilling hole.
Further, the diameter of the upper end of the tapered hole is 0.2mm larger than the diameter of the back drilled hole.
Further, the taper angle of the taper hole is 120-165 degrees.
Further, the taper angle of the tapered hole is 135 °.
Further, the thickness of the aluminum sheet is 0.2-0.4 mm.
Further, the thickness of the aluminum sheet is 0.3 mm.
Advantageous effects
Compared with the prior art, the invention has the advantages that: according to the invention, when the back drilling hole is plugged, the resin is in a conical state with a large lower part and a small upper part, when the screen plate is lifted, the gravity center of the resin gathered at the hole opening of the back drilling hole is at the lower part of the cone and cannot be brought up by the screen plate, and after multiple times of verification on PCB boards with different back drilling holes, the proportion of full resin plugging of the back drilling hole can reach 100%, the problem of no hole resin sinking can be solved, a large amount of manpower and material resources which need to be detected and plugged in the later period can be saved, the stability of long-term work and the service life of the PCB can be ensured, and the normal operation of equipment can be ensured in the guarantee period under the harsh conditions of high strength (temperature or use frequency) and the like.
Drawings
FIG. 1 is a schematic diagram of a conventional structure;
fig. 2 is a schematic structural diagram of the present invention.
Wherein: 1-aluminum sheet and 2-tapered hole.
Detailed Description
The invention will be further described with reference to specific embodiments shown in the drawings.
Referring to fig. 2, in the method for back drilling resin hole plugging, when the back drilling hole is plugged, the resin is formed into a tapered state with a large lower part and a small upper part, and then the hole plugging screen plate is separated from the PCB. The taper angle of the tapered state is 120 ° to 165 °, and preferably, the taper angle of the tapered state is 135 °. When the screen printing plate is lifted, the center of gravity of the resin gathered at the hole opening of the back drilling hole is positioned at the lower part of the cone and cannot be lifted by the screen printing plate, so that the hole plugging of the resin can reach 100 percent, the problem of hole-free resin sinking can be solved, and a large amount of manpower and material resources required for detecting and plugging the hole in the later period can be saved.
The utility model provides an aluminum sheet half tone of being applied to back drilling resin consent, includes aluminum sheet 1, aluminum sheet 1 is equipped with the bell mouth 2 that corresponds with the back drilling hole position, and bell mouth 2 is the structure that the upper end is little, the lower extreme is big, 2 upper ends of bell mouth and half tone contact promptly, 2 lower extremes of bell mouth and PCB board contact, and 2 covers of bell mouth are on the back drilling hole, and the diameter of 2 upper ends of bell mouth is greater than the diameter of back drilling hole.
In this embodiment, the diameter of the upper end of the tapered hole 2 is 0.1-0.3 mm larger than the diameter of the back drilling hole, which can ensure that ink leaks into the back drilling hole corresponding to the PCB from the tapered hole 2, and preferably, the diameter of the upper end of the tapered hole 2 is 0.2mm larger than the diameter of the back drilling hole. The taper angle of the conical hole 2 is 120-165 degrees, a common drill bit can be conveniently selected for processing, the processing cost is reduced, and preferably, the taper angle of the conical hole 2 is 135 degrees. The thickness of the aluminum sheet 1 is 0.2-0.4 mm, the working strength and the service life of the aluminum sheet 1 can be guaranteed, and preferably, the thickness of the aluminum sheet 1 is 0.3 mm.
The manufacturing method of the aluminum sheet screen printing plate comprises the following steps:
blanking, cutting an aluminum plate to obtain an aluminum sheet 1 corresponding to the size requirement of the screen printing plate;
burrs at the edge of the aluminum sheet 1 are removed, so that the burrs are prevented from hurting hands and influencing drilling precision;
drilling, namely machining the conical hole 2 on the aluminum sheet 1 by using a depth control drill;
removing burrs at two ends and inside of the conical hole 2;
and (3) bonding or welding the aluminum sheet 1 and the surface corresponding to the small end of the conical hole 2 to the screen printing plate to obtain the aluminum sheet screen printing plate.
The center of gravity of the resin gathered at the hole opening of the back drilling hole is positioned at the lower part of the conical hole 2, the viscosity between the resin and the conical hole 2 is gradually reduced from bottom to top, the resin cannot be taken up by the screen printing plate when the aluminum sheet screen printing plate is lifted, and the problems that the hole plugging of the resin can reach 100 percent and the hole-free resin is sunken are solved.
The above is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that several variations and modifications can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the utility of the patent.
Claims (10)
1. A method for back drilling resin hole plugging is characterized in that when hole plugging is carried out on a back drilling hole, resin is enabled to be in a conical state with a large lower part and a small upper part, and then a hole plugging screen plate is separated from a PCB.
2. The method of claim 1, wherein said taper has a taper angle of from 120 ° to 165 °.
3. A method for backdrilling a resin plug hole according to claim 2, wherein the taper angle of the tapered state is 135 °.
4. The utility model provides an aluminum sheet half tone for back drilling resin consent, includes aluminum sheet (1), its characterized in that, aluminum sheet (1) is equipped with bell mouth (2) that correspond with back drilling hole position, bell mouth (2) are the structure that the upper end is little, the lower extreme is big, the diameter of bell mouth (2) upper end is greater than the diameter of back drilling hole.
5. The aluminum sheet screen printing plate applied to back drilling of the resin plug hole is characterized in that the diameter of the upper end of the tapered hole (2) is 0.1-0.3 mm larger than that of the back drilling hole.
6. The aluminum sheet screen printing plate applied to back drilling of the resin plug hole is characterized in that the diameter of the upper end of the tapered hole (2) is 0.2mm larger than that of the back drilling hole.
7. The aluminum sheet screen printing plate for back-drilling resin plug hole according to claim 4, wherein the taper angle of the taper hole (2) is 120-165 °.
8. The aluminum sheet screen printing plate for back-drilling resin plug hole according to claim 7, wherein the taper angle of the taper hole (2) is 135 °.
9. The aluminum sheet screen printing plate applied to back drilling of the resin plug holes is characterized in that the thickness of the aluminum sheet (1) is 0.2-0.4 mm.
10. The aluminum sheet screen printing plate for back drilling resin plug holes as claimed in claim 9, wherein the thickness of the aluminum sheet (1) is 0.3 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010788101.5A CN111800949A (en) | 2020-08-07 | 2020-08-07 | Method for back drilling resin plug hole and aluminum sheet screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010788101.5A CN111800949A (en) | 2020-08-07 | 2020-08-07 | Method for back drilling resin plug hole and aluminum sheet screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111800949A true CN111800949A (en) | 2020-10-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010788101.5A Pending CN111800949A (en) | 2020-08-07 | 2020-08-07 | Method for back drilling resin plug hole and aluminum sheet screen |
Country Status (1)
| Country | Link |
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| CN (1) | CN111800949A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112512217A (en) * | 2020-11-13 | 2021-03-16 | 奥士康科技股份有限公司 | PCB anti-welding hole plugging method for double-sided back drilling product |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0946019A (en) * | 1995-08-03 | 1997-02-14 | Kuwabara Seisakusho:Kk | Printed wiring board |
| CN101085566A (en) * | 2006-06-07 | 2007-12-12 | 上海安科瑞电气有限公司 | Novel leaking net plate |
| CN102523699A (en) * | 2011-12-15 | 2012-06-27 | 深圳崇达多层线路板有限公司 | Resin plug-hole apparatus of PCB back borehole and method thereof |
| CN204104221U (en) * | 2014-09-19 | 2015-01-14 | 南京日托光伏科技有限公司 | The point-like printing stainless steel half tone of a kind of conducting resinl or tin cream |
| CN204145908U (en) * | 2014-09-30 | 2015-02-04 | 东莞技研新阳电子有限公司 | A kind of web plate hatch frame |
| CN106211592A (en) * | 2016-08-31 | 2016-12-07 | 奥士康科技股份有限公司 | A kind of method for designing about ink plugging instrument |
-
2020
- 2020-08-07 CN CN202010788101.5A patent/CN111800949A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0946019A (en) * | 1995-08-03 | 1997-02-14 | Kuwabara Seisakusho:Kk | Printed wiring board |
| CN101085566A (en) * | 2006-06-07 | 2007-12-12 | 上海安科瑞电气有限公司 | Novel leaking net plate |
| CN102523699A (en) * | 2011-12-15 | 2012-06-27 | 深圳崇达多层线路板有限公司 | Resin plug-hole apparatus of PCB back borehole and method thereof |
| CN204104221U (en) * | 2014-09-19 | 2015-01-14 | 南京日托光伏科技有限公司 | The point-like printing stainless steel half tone of a kind of conducting resinl or tin cream |
| CN204145908U (en) * | 2014-09-30 | 2015-02-04 | 东莞技研新阳电子有限公司 | A kind of web plate hatch frame |
| CN106211592A (en) * | 2016-08-31 | 2016-12-07 | 奥士康科技股份有限公司 | A kind of method for designing about ink plugging instrument |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112512217A (en) * | 2020-11-13 | 2021-03-16 | 奥士康科技股份有限公司 | PCB anti-welding hole plugging method for double-sided back drilling product |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201020 |
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| RJ01 | Rejection of invention patent application after publication |