CN101301808A - Surface mounting technology print stencil net frame - Google Patents
Surface mounting technology print stencil net frame Download PDFInfo
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- CN101301808A CN101301808A CNA200810066483XA CN200810066483A CN101301808A CN 101301808 A CN101301808 A CN 101301808A CN A200810066483X A CNA200810066483X A CN A200810066483XA CN 200810066483 A CN200810066483 A CN 200810066483A CN 101301808 A CN101301808 A CN 101301808A
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- section bar
- surface mounting
- net frame
- mounting technology
- screen frame
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Abstract
The invention discloses a printing template screen frame of a surface sticking technology; the middle width of the section of the proximate matter of the screen frame is larger than the width of the lower side; as the middle width of the section of the proximate matter of the screen frame is designed to be larger than the width of the lower side, the invention can improve the anti-bending intensity of the screen frame under the situation of being capable of preserving net yarn with a certain width needed by the tension of a steel sheet, thereby improving the quality of the printing solder paste. The invention also relates to a method for manufacturing the section of the proximate matter of the screen frame.
Description
Technical field
The present invention relates to printing technology, in particular, relate to a kind of SMT print stencil net frame and preparation method thereof.
Background technology
The range of application of printing stencil is very big, and is especially extensive in the serigraphy field.Because the development of electronics manufacturing, mould printing technology also is applied at electronics manufacturing, and the SMT printing stencil is exactly the typical case.SMT (Surface mounting technology) is the meaning of surface mounting technology, in the electronic product manufacture process, to weld electronic component and PCB need be placed on tin on the PCB earlier, and have hundreds of pad need go up tin on the PCB, the position of each pad all corresponding electronic component, print the disposable first-class accurately tin the best way of the pad of tin on the needs exactly.Method commonly used is to make the stainless steel substrates that countless apertures are arranged in electronics manufacturing, each hole all corresponding the pad of tin on needs, then stainless steel substrates is attached on the grenadine that stretches tight, grenadine is attached on the bottom surface of print stencil net frame, steel disc combines the back grenadine and provide pulling force to steel disc under the support of screen frame with grenadine, make stainless steel substrates keep the state of tensioning to print.
The silk-screen screen frame is used in electronics manufacturing smoothly, and the section bar type identical with the silk-screen screen frame (for example rectangle section bar cross section of relatively using always in the SMT printing stencil) 40*40mm, 30*40mm, 20*30mm, 25.4*38.1mm etc. also are extensive use of.
But screen printing technique and SMT printing are to exist than big-difference.The first, screen printing technique is directly to print on grenadine, and grenadine only serves as a carrier in the SMT printing; The second, grenadine tension force is less demanding in the serigraphy, and usually at 0 ~ 30N/cm, and the tension force of grenadine and steel disc is wanted 40 ~ 50N/cm in the SMT printing; The 3rd, most of usefulness is liquid printing ink in the serigraphy, and printing ink is easy to penetrate grenadine, and therefore required scraper pressure is little, and in the SMT printing printing be that tin cream is the paste shape, need the pressure of scraper bigger; Or the like.
Because the existence of above-mentioned kind of species diversity, traditional silk-screen screen frame are owing to insufficient strength, it is used the following problem of frequent appearance in the SMT printing: screen frame curves inwardly under high-tensile strength and can make steel disc tension force inhomogeneous, causes the print solder paste off normal; The screen frame distortion can cause two faces of steel disc and PCB to contact not tight; The screen frame warpage can make steel disc and PCB contact-making surface slit or the like occur.These all can have a strong impact on the quality of print solder paste.
Summary of the invention
Technical problem to be solved by this invention provides a kind of more high-intensity surface mounting technology print stencil net frame.
Surface mounting technology print stencil net frame of the present invention, the middle part width in the section bar cross section of described screen frame is greater than bottom.
The top of described section bar is parallel to section bar bottom, and described middle part width is the length that is parallel to the center line on the upper and lower both sides of section bar.Going up of section bar is following parallel, designs easily and makes.
The top of described section bar is less than described middle part width.Can save the material of section bar like this.
Between section bar top, center line, the following left end point and connect by smoothed curve respectively between the right endpoint.Intensity that like this can reinforcing profile.
Divide other smoothed curve to be respectively two circular arc lines between the left end point of section bar top, center line, bottom and between the right endpoint, the section bar cross section of screen frame is " drum type "." drum type " like this is best antitorque structure.
Described section bar middle part width is following 1.1-1.3, and described section bar top is the 0.93-0.96 of following size.This is section bar middle part width, section bar top and a preferable proportion of the following size of section bar.
Described section bar middle part width is 1.2162 of a bottom, and described section bar top is 0.9459 of a bottom.This is a ratio of section bar middle part width, section bar top and the following size the best of section bar.
The thickness on the upper and lower both sides of section bar is 1～3mm.This is a preferable size range of the thickness on the upper and lower both sides of section bar.
The thickness on the left and right both sides of section bar is 1～4mm.This is a preferable size range of the thickness on the left and right both sides of section bar.
The thickness on the upper and lower both sides of section bar is 2.5mm, and the thickness on the left and right both sides of section bar is 1.5mm.This is the thickness on the upper and lower both sides of section bar, a size model of the best of the thickness on the left and right both sides of section bar
The present invention since the middle part width in the section bar cross section of screen frame be set to greater than bottom, so can guarantee to improve the bending strength of screen frame, thereby improve the quality of print solder paste under the grenadine situation of the certain width that the tension force of steel disc is required in reservation.
Description of drawings
Fig. 1 is the sectional view of former SMT print stencil net frame section bar.
Fig. 2 is top, center line, the edge lengths schematic diagram down in the SMT print stencil net frame section bar cross section among the embodiment.
Fig. 3 is the profile schematic diagram in the SMT print stencil net frame section bar cross section among the embodiment.
Fig. 4 is the SMT print stencil net frame section bar schematic cross-section among the embodiment.
Wherein: 1, former section bar top, 2, former section bar bottom, 3, the former section bar left side, 4, former section bar the right, 5, glue, 6, grenadine, 7, existing section bar top, 8, existing section bar bottom, 9, the existing section bar left side, 10, existing section bar the right.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing and preferred embodiment.
Fig. 1 is the sectional view of existing screen frame, and the cross section of screen frame is a rectangle among the figure, former section bar top 1, parallel and equal with former section bar following 2, and the former section bar left side 3 is parallel and equal with former section bar the right 4.
According to engineering mechanics theories, increase the cross section integral width and can improve bending strength, but on the SMT screen frame, must keep the tension force that grenadine 6 certain width just can be guaranteed steel disc, so can not adopt the mode of the base size of inside prolongation section bar improve screen frame bending strength, and peripheral four limits, the bottom of screen frame all are to have fixing specification simultaneously, so also can not improve by the base size of outside lengthening section bar screen frame bending strength, therefore our breakthrough waist sizes that only increases screen frame on the structure, the middle part size in the section bar cross section of screen frame is set to can improve the bending strength of screen frame greater than following size; Bottom width reduces under the constant situation of grenadine 6 width guaranteeing as far as possible, will guarantee that simultaneously the area of gluing glue 5 is enough; The end face width will reduce for the purpose of economizing material as far as possible, but will take all factors into consideration the certain width of applied environment reservation of various device.It is to increase antitorque optimum structure that the side adopts circular arc to connect.
The top 7 in the section bar cross section of the surface mounting technology print stencil net frame described in the embodiment is parallel to section bar bottom 8, and described middle part width is the length that is parallel to the center line on the upper and lower both sides of section bar.Described section bar middle part width is following 1.1-1.3, and the best is 1.2162, and described section bar top is following 0.93-0.96, and the best is 0.9459.Divide other smoothed curve to be respectively two circular arc lines between the left end point of section bar top, center line, bottom and between the right endpoint, the section bar cross section of screen frame is " drum type "." drum type " like this is best antitorque structure.The thickness on the upper and lower both sides of section bar is 1～3mm, and the best is 2.5mm.The thickness on the left and right both sides of section bar is 1～4mm, and the best is 1.5mm.
The section bar cross section of above-mentioned screen frame is " drum type " and can adopts following procedure of processing to realize: at the section bar of original screen frame, as Fig. 1, the cross section of section bar is a rectangle, and scope is X*Y, and wherein X represents the height of section bar, and Y represents the width of section bar; Keep X constant, former section bar top 1 is dwindled 12.5% form existing section bar top 7, former section bar bottom 2 dwindles 7.5% and forms existing section bar bottom 8, a left side, the mid point on right both sides prolongs Y direction width and increases by 12.5%, form the top in the SMT print stencil net frame section bar cross section this moment, center line, following edge lengths, as Fig. 2, if the length cc ' with existing section bar bottom 8 is a base value, midline length bb ': cc '=1.2162 then, the length aa ' of existing section bar top 7: cc '=0.9459, again respectively with the top, following, the end points a of center line, b, c and a ', b ', c ' draws circular arc for the summit and obtains the existing section bar left side 9 and existing section bar the right 10, like this, just form Fig. 3, Fig. 3 is exactly the profile in section bar cross section, and profile determines that the wall thickness of each wall of back satisfies following rule: existing section bar top 7 and following 8 wall thickness of existing section bar are less than or equal to the wall thickness on the existing section bar left side 9 and existing section bar the right 10; The wall thickness of existing section bar top 7 and existing section bar bottom 8 greater than 1mm less than 3mm, preferred 1.5mm; Less than 4mm, preferred 2.5mm has so just formed SMT print stencil net frame section bar schematic cross-section Fig. 4 to the wall thickness on the existing section bar left side 9 and existing section bar the right 10 greater than 1mm.
Equally, ab, bc, a ' b ', b ' c ', also can be connected to form the section bar cross section with other level and smooth curves or straight line be laemodipodiform, Pear-Shaped, hexagon or the like shape.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1, a kind of surface mounting technology print stencil net frame is characterized in that, the middle part width in the section bar cross section of screen frame is greater than bottom.
2, surface mounting technology print stencil net frame according to claim 1 is characterized in that, the top of described section bar is parallel to section bar bottom, and described middle part width is the length that is parallel to the center line on the upper and lower both sides of section bar.
3, surface mounting technology print stencil net frame according to claim 2 is characterized in that, the top of described section bar is less than described middle part width.
4, surface mounting technology print stencil net frame according to claim 3 is characterized in that, between section bar top, center line, the following left end point and connected by smoothed curve respectively between the right endpoint.
5, surface mounting technology print stencil net frame according to claim 4, it is characterized in that, divide other smoothed curve to be respectively two circular arc lines between the left end point of section bar top, center line, bottom and between the right endpoint, the section bar cross section of screen frame is " drum type ".
6, surface mounting technology print stencil net frame according to claim 5 is characterized in that, described section bar middle part width is following 1.1-1.3, and described section bar top is following 0.93-0.96.
7, surface mounting technology print stencil net frame according to claim 6 is characterized in that, described section bar middle part width is 1.2162 of a bottom, and described section bar top is 0.9459 of a bottom.
8, according to any described surface mounting technology print stencil net frame of claim among the claim 2-7, it is characterized in that the thickness on the upper and lower both sides of section bar is 1～3mm.
9, surface mounting technology print stencil net frame according to claim 8 is characterized in that, the thickness on the left and right both sides of section bar is 1～4mm.
10, surface mounting technology print stencil net frame according to claim 8 is characterized in that, the thickness on the upper and lower both sides of section bar is 2.5mm, and the thickness on the left and right both sides of section bar is 1.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810066483XA CN101301808B (en) | 2008-04-11 | 2008-04-11 | Surface mounting technology print stencil net frame |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810066483XA CN101301808B (en) | 2008-04-11 | 2008-04-11 | Surface mounting technology print stencil net frame |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101301808A true CN101301808A (en) | 2008-11-12 |
| CN101301808B CN101301808B (en) | 2010-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810066483XA Active CN101301808B (en) | 2008-04-11 | 2008-04-11 | Surface mounting technology print stencil net frame |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LT5825B (en) | 2010-09-06 | 2012-04-25 | Uab "Laser Stencil Europe", , | Stencil for solder paste or glue application |
| CN104768334A (en) * | 2014-01-06 | 2015-07-08 | 宁波舜宇光电信息有限公司 | Surface mounting method for dynamically adjusting surface mounting position and device thereof |
-
2008
- 2008-04-11 CN CN200810066483XA patent/CN101301808B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LT5825B (en) | 2010-09-06 | 2012-04-25 | Uab "Laser Stencil Europe", , | Stencil for solder paste or glue application |
| CN104768334A (en) * | 2014-01-06 | 2015-07-08 | 宁波舜宇光电信息有限公司 | Surface mounting method for dynamically adjusting surface mounting position and device thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101301808B (en) | 2010-12-15 |
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