CN1868644A - Cover plate and method with precision of lifting hole site - Google Patents
Cover plate and method with precision of lifting hole site Download PDFInfo
- Publication number
- CN1868644A CN1868644A CN 200510072097 CN200510072097A CN1868644A CN 1868644 A CN1868644 A CN 1868644A CN 200510072097 CN200510072097 CN 200510072097 CN 200510072097 A CN200510072097 A CN 200510072097A CN 1868644 A CN1868644 A CN 1868644A
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- China
- Prior art keywords
- base plate
- cover plate
- lifting position
- sand
- hole accuracy
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Abstract
A cover plate and method for improving the accuracy of drilled hole is disclosed. Said method includes such steps as providing a bottom plate, and roughening its surface by sand blasting while increasing its surface hardness for stabilizing the start point to be drilled.
Description
Technical field
The present invention relates to a kind of cover plate, refer to a kind of substrate top that places especially, when making the boring unit carry out bore operation, can reduce drill point skew probability, and then promote the cover plate and the method for position, hole accuracy.
Background technology
The trend of now scientific and technological microization, making electric equipment products (as mobile phone, personal digital assistant, digital household appliances, networking products, portable computer etc.) serves as the design orientation with " compact " all.Same, the design of PCB/BGA also develops towards the direction of high density holes, glass-coated microwire and high-mechanic electronic building brick.Requirement for the drilling quality of PCB/BGA also just raises day by day.
The bore operation of PCB or BGA substrate is to carry out mechanical boring with drill point.When it is made, be that a plurality of laminar substrates 11 are placed on the base wad 12 of boring board, wherein, substrate 11 predetermined bore positions 13 are corresponding with drill point 14, make that drill point is 14 rotatable, decline is carried out bore operation to substrate 11.When carrying out bore operation, add the cover plate 15 of an aluminium matter in addition in the top of PCB or BGA substrate, to prevent that boring pressure forms impression, reduces the drill bit temperature and prevents substrate 11 itself on substrate 11 toughness from causing that drill point significantly departs from etc.
But the smooth surface and the quality of aluminium cover plate 15 are softer, when drill point 14 contact aluminium cover plates 15, cause inclined to one side pin because of waving and rocking easily.Please refer to Fig. 1, it is the schematic diagram of known boring processing procedure drill point skew.As shown in the figure, when drill point 14 contacted with aluminium cover plate 15, causing holing because of the smooth surface of aluminium cover plate 15 and quality are softer relatively, the hole was biased moves.And, because the drill center on the aluminium cover plate 15 has been offset, heal substrate far away 11 its add up errors also just more greatly apart from cover plate 15.
Other please refer to Fig. 2, and it is known boring processing procedure boring position, a hole schematic diagram.The position, position, hole of inner ring representative boring storEs in the acceptable tolerance scope, places the outer stain of inner ring promptly to represent position, position, hole to exceed in the acceptable tolerance scope.As seen from the figure, known boring processing procedure has the boring of certain ratio, and its position exceeds the acceptable tolerance scope.In other words, the boring accuracy of known boring processing procedure has sizable room for improvement.Especially bad, drill point skew also can cause that hole wall is in poor shape, the drill point temperature is too high and increase the problem of broken needle probability.
Therefore, how developing a kind of cover plate, to solve the inconvenience of known technology, will be that the present invention desires actively to inquire into part.
Summary of the invention
Main purpose of the present invention provides a kind of method that promotes position, hole accuracy that has, and the shot peening that it utilizes sand-blasting machine makes backplate surface form matsurface, the hardness of this backplate surface is increased, to reduce the probability of the inclined to one side pin of drill point.
Secondary objective of the present invention provides a kind of cover plate that promotes position, hole accuracy that has, and it increases the hardness of backplate surface by being positioned at the sandblast layer of backplate surface, makes the following brill point of drill point stable.
According to above-described purpose, the present invention proposes a kind of method that promotes position, hole accuracy that has, at least comprise the following steps: at first to provide a base plate, then utilize sand-blasting machine in this backplate surface with the shot peening sandblast to form matsurface, the hardness of backplate surface is increased.
Preferably, this base plate is an aluminium matter.
Preferably, the method that backplate surface hardness is increased forms matsurface for making backplate surface.
Preferably, the method for formation backplate surface matsurface can be following wherein a kind of method: sand-blast, pressure rolling method and etching method.
Preferably, sand-blast is with sand-blasting machine sandblast on this base plate.
Preferably, sand-blasting machine is with the shot peening sandblast.
Preferably, the bead of shot peening is circular bead.
The present invention also proposes a kind of cover plate that promotes position, hole accuracy that has, and comprising: a base plate; Reach a sandblast layer, be positioned at the surface of this base plate.
In sum, a kind of cover plate and method that the present invention proposes with lifting position, hole accuracy, the probability of inclined to one side pin when it can reduce drill point execution bore operation, and then increase the drill point access times.
Description of drawings
Fig. 1 is the schematic diagram of known boring processing procedure drill point skew.
Fig. 2 is known boring processing procedure boring position, a hole schematic diagram.
Fig. 3 is the schematic diagram of sand-blasting machine of the present invention sandblast on base plate.
Fig. 4 is for after the present invention finishes the sandblast step, the partial enlarged drawing that backplate surface presents.
Partial enlarged drawing when Fig. 5 bores down for drill point of the present invention.
Fig. 6 is the present invention's processing procedure boring position, hole schematic diagram of holing.
Description of reference numerals:
11 substrates, 12 base wads, 13 bore positions, 14 drill points
15 cover plates, 31 base plates, 32 sand-blasting machines, 51 cover plates
52 substrates, 53 drill points
The specific embodiment
See also Fig. 3, be the schematic diagram of sand-blasting machine of the present invention sandblast on base plate.A kind of method with lifting position, hole accuracy, may further comprise the steps: (1) provides a base plate 31, and it can be aluminium matter; And (2) increase the hardness on base plate 31 surfaces.The method that base plate 31 case hardnesses are increased forms matsurface for making base plate 31 surfaces.The method that forms base plate 31 rough surface faces is to utilize sand-blast (also can utilize pressure rolling method or etching method etc.).Sand-blast is to utilize mode in base plate 31 on the sandblast of sand-blasting machine 32 with shot peening.The mode of shot peening is to utilize the airless injection system machinery of centrifugal force, and bead is led toward the impeller center from the portion of accumulating, and by the blade acceleration of rotation at a high speed, throws a large amount of circular beads to base plate 31 with high turn of speed.
See also Fig. 4 and 5, be respectively after the present invention finishes the sandblast step partial enlarged drawing when partial enlarged drawing that backplate surface presents and drill point of the present invention bore down.As shown in the figure, base plate 31 surfaces form by the rough surface that many circles were stacked into after elaborating with the circular bead bump of shot peening through sand-blasting machine, also relatively increase the hardness of base plate 31.Softer and than the state of smooth surface with respect to known aluminium sheet, base plate 31 hardness of the present invention increase and the presenting of matsurface, and more help boring drill point under the stability of point, the minimizing biased situation of moving in hole (as shown in Figure 4).In addition, the base plate that hardness has increased, just cover plate 51, when carrying out bore operation, are to place substrate 52 tops, can do directly to contact with cover plate 51 when drill point is bored for 53 times.For making cover plate 51 and the substrate 52 can be docile and fixing mutually, between the two can appropriateness tape in back edge be fixing, the add up error value of substrate 52 under this also can reduce.Best situation is that cover plate 51 itself can not have folding line or scratch.
See also Fig. 6, be the present invention's processing procedure boring position, hole schematic diagram of holing.As shown in the figure, nearly all stain all falls in the acceptable tolerance scope.In other words, the biased probability of moving in boring hole is very low.With respect to known, cover plate 51 hardness of the present invention are high than aluminium sheet, make the following brill point of drill point more accurate, and obviously Da Fu promotes the accuracy of boring position, hole.
A kind of cover plate with precision of lifting hole site that the present invention also proposes comprises, a base plate and a sandblast Layer. Base plate is aluminium matter. The sandblast layer is the surface that is positioned at base plate. Wherein, the sand grains of sandblast layer is circular bead. By the sandblast layer that circular bead forms, can make the hardness of cover plate itself increase roughness by backplate surface Improve. When carrying out bore operation, when drill point descended, the quality of cover plate itself can make to bore under the drill point to put to be stablized, Drill point location is easier, reduces as known drill point waves and rocks and produce the situation of drill center deflection. And, because of Be countersink pinhole position deflection not, its advantage more comprises: the relative meeting of hole wall situation is better, the drill point thermal diffusivity also can Better, drill point ditch tail twines that the bits problem can be avoided, drill point cleans easily, the probability of drill point broken needle descends and drill point Life cycle growth etc. When carrying out bore operation, can select to increase the substrate number or accelerate execution speed, with Increase work efficiency.
Claims (10)
1, a kind of method with lifting position, hole accuracy comprises:
(1) provides a base plate; And
(2) hardness of this backplate surface is increased.
2, the method with lifting position, hole accuracy as claimed in claim 1 is characterized in that this base plate is an aluminium matter.
3, the method with lifting position, hole accuracy as claimed in claim 1 is characterized in that, the method that backplate surface hardness is increased forms matsurface for making backplate surface.
4, the method with lifting position, hole accuracy as claimed in claim 3 is characterized in that the method that forms the backplate surface matsurface can be following wherein a kind of method: sand-blast, pressure rolling method and etching method.
5, the method with lifting position, hole accuracy as claimed in claim 4 is characterized in that sand-blast is with sand-blasting machine sandblast on this base plate.
6, the method with lifting position, hole accuracy as claimed in claim 5 is characterized in that sand-blasting machine is with the shot peening sandblast.
7, the method with lifting position, hole accuracy as claimed in claim 6 is characterized in that the bead of shot peening is circular bead.
8, a kind of cover plate with lifting position, hole accuracy comprises:
One base plate; And
One sandblast layer is positioned at the surface of this base plate.
9, the cover plate with lifting position, hole accuracy as claimed in claim 8 is characterized in that this base plate is an aluminium matter.
10, the cover plate with lifting position, hole accuracy as claimed in claim 8 is characterized in that the sand grains of this sandblast layer is circular bead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510072097 CN1868644A (en) | 2005-05-26 | 2005-05-26 | Cover plate and method with precision of lifting hole site |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510072097 CN1868644A (en) | 2005-05-26 | 2005-05-26 | Cover plate and method with precision of lifting hole site |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1868644A true CN1868644A (en) | 2006-11-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510072097 Pending CN1868644A (en) | 2005-05-26 | 2005-05-26 | Cover plate and method with precision of lifting hole site |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1868644A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101829883A (en) * | 2010-04-30 | 2010-09-15 | 唐山轨道客车有限责任公司 | Method for manufacturing sidewall panel of railway passenger vehicle |
| CN103056918A (en) * | 2012-12-21 | 2013-04-24 | 深圳市柳鑫实业有限公司 | Aluminum sheet for improving accuracy of hole site of drill hole and manufacturing method |
-
2005
- 2005-05-26 CN CN 200510072097 patent/CN1868644A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101829883A (en) * | 2010-04-30 | 2010-09-15 | 唐山轨道客车有限责任公司 | Method for manufacturing sidewall panel of railway passenger vehicle |
| CN101829883B (en) * | 2010-04-30 | 2012-08-29 | 唐山轨道客车有限责任公司 | Method for manufacturing sidewall panel of railway passenger vehicle |
| CN103056918A (en) * | 2012-12-21 | 2013-04-24 | 深圳市柳鑫实业有限公司 | Aluminum sheet for improving accuracy of hole site of drill hole and manufacturing method |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |