CN208724264U - A kind of steel mesh for manual Reflow Soldering - Google Patents
A kind of steel mesh for manual Reflow Soldering Download PDFInfo
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- CN208724264U CN208724264U CN201821146486.XU CN201821146486U CN208724264U CN 208724264 U CN208724264 U CN 208724264U CN 201821146486 U CN201821146486 U CN 201821146486U CN 208724264 U CN208724264 U CN 208724264U
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- aperture
- steel mesh
- pad
- intensive
- son
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- Printing Plates And Materials Therefor (AREA)
Abstract
The utility model discloses a kind of steel meshes for manual Reflow Soldering, it is provided with several for carrying out the aperture of paste solder printing, aperture includes the first aperture for intensive pad paste solder printing, intensive pad is made of the corresponding multiple intensive pads of son of the multiple pins in more pin components the same side, and single intensive pad is directly crossed in single first aperture.The steel mesh for manual Reflow Soldering of the utility model, can be effectively reduced small lot component welding cost, improve welding efficiency and yield rate.
Description
Technical field
A kind of the utility model electronics industry welding technology field, and in particular to steel mesh for manual Reflow Soldering.
Background technique
Surface installation technique (SMT) is a kind of will to pacify without pin or short leg surface-assembled component (abbreviation SMC/SMD)
On the surface of printed circuit board (Printed Circuit Board, abbreviation PCB) or the surface of other substrates, by returning
The methods of fluid welding or immersed solder are subject to the circuit load technology of welding assembly, are most common a kind of skills in current electronic assembly industry
Art and technique.
Surface installation technique (SMT) generally includes following steps:
1) steel mesh is made, which is reserved with aperture identical with pad size in the corresponding position of board pads；
2) paste solder printing covers steel mesh on circuit boards, and tin cream is passed through opening on steel mesh using the scraper of printing machine
It bites on pad in hole；
3) part mounts, and component is accurately placed at circuit board corresponding position, makes component's feet and pad by chip mounter
On tin cream be in contact；
4) circuit board after attachment is put into reflow soldering, and is heated according to specific temperature curve by reflow soldering, is melted
Change tin cream, then liquid solder can be adsorbed on pin (referred to as " phenomenon of solder rising ") under the action of electro-wetting principle, first after cooling
Device pin is securely welded on pad.
When in above-mentioned paste solder printing step, in order to guarantee welding effect, strict control paste solder printing amount, therefore steel are needed
Net can be made very thin, generally less than 0.15mm, so that the cost of manufacture of steel mesh is higher；Meanwhile steel mesh when paste solder printing
It generally requires and tensioning is carried out by the mechanical arm of printing machine, to fix steel mesh and guarantee that steel mesh is smooth.Therefore, surface installation technique
(SMT) it is chiefly used in industrial mass production, and the component of small lot is welded, is still mainly ironed at present by manpower using electricity
Iron is welded.Since the pin spacing of component is smaller (0.1~0.5mm), the problems such as being easy to appear rosin joint, desoldering, burn-through,
Cause welding efficiency, yield rate lower, especially for the welding of intensive device, this problem is more prominent.
It can be seen that a kind of welding method of surface-assembled suitable for small lot component is needed, to reduce small lot
Component welding cost improves welding efficiency and yield rate.
Utility model content
The utility model provides a kind of steel mesh for manual Reflow Soldering, can be applied to the craft of small lot component
In reflow soldering, it can be effectively reduced small lot component welding cost, improve welding efficiency and yield rate.
In order to solve the above technical problems, the utility model uses following technical scheme:
A kind of steel mesh for manual Reflow Soldering is provided with several apertures for being used to carry out paste solder printing, described to open
Hole includes the first aperture for intensive pad paste solder printing, and the intensive pad is by the multiple pins in more pin components the same side
The single intensive pad is directly crossed in the corresponding intensive pad composition of multiple sons, single first aperture.
Further, the steel mesh is planar sheet, and first aperture is rectangle, and size meets:
L=(D+d) n-d,
W<l
Wherein, the L: the first aperture length, D: the width of the intensive pad of son, d: the spacing of the adjacent intensive pad of son, n: son is close
Collect the quantity of pad；W: the first aperture widths, l: the length of the intensive pad of son.
Further, the width W of single first aperture are as follows:
0.5c≤H≤c
Wherein, the W: the first aperture widths, k: the angle of pin and the intensive pad of son, p1: solder institute accounting in tin cream ingredient
Example, p2: scaling powder proportion in tin cream ingredient, H ': the thickness of steel mesh, H: the height of tin cream meniscus, c: pin thickness.
Further: the thickness d of steel mesh meets: 0.20mm≤d≤0.3mm.
Further, the aperture further includes that the second aperture of paste solder printing is carried out for non-dense set pad, and described second
Size scaled down of the size of aperture relative to non-dense set pad.
Further, the making material of steel mesh is metal or plastics.
Further, the aperture is made in the way of laser, electroforming, etching etc..
Compared with prior art, the utility model has the following beneficial effects:
The steel mesh of the utility model overcomes for pad intensive on circuit board, steel mesh aperture inconvenience, aperture difficulty
Big problem effectively improves the producing efficiency of steel mesh, reduces the welding cost of small lot component, meanwhile, it improves
Manual reflow soldering efficiency.It is described close as long as the control of paste solder printing amount is rationally due to phenomenon of solder rising when carrying out reflow soldering
It can be all attached on neighbouring pin after tin cream fusing between collection pad, without will cause the adhesion between pin；
In the present embodiment, the thickness of steel mesh is not less than 0.2mm, by using thicker steel mesh, facilitates production for tin cream
The aperture of printing, and in paste solder printing, convenient for steel mesh is fixed on circuit boards.It is particularly suitable for the hand of small lot component
Work reflow soldering can efficiently solve rosin joint during manual welding, de- in conjunction with manual welding and the respective advantage of Reflow Soldering
The problems such as weldering, burn-through, low yield rate, improves the welding efficiency of small lot component；At the same time it can also be effectively reduced Reflow Soldering
Steel mesh cost of manufacture, thereby reduces welding cost.
Detailed description of the invention
The technology of the utility model is described in further detail with reference to the accompanying drawings and detailed description:
Fig. 1 is the intensive pad schematic diagram of circuit board described in the utility model；
Fig. 2 is the first aperture schematic diagram of steel mesh described in the utility model；
Fig. 3 is the schematic diagram of steel mesh described in the utility model in one embodiment；
Fig. 4 is the corresponding circuit board schematic diagram of steel mesh described in Fig. 3；
Fig. 5 is component described in the utility model and pad reflow soldering schematic diagram；
Wherein:
1, circuit board；11, intensive pad；111, the intensive pad of son；12, non-dense set pad；2, net；21, the first aperture；
22, the second aperture；3, component；31, pin；32, more pin components；4, tin cream；41, tin cream meniscus；
Specific embodiment
It is illustrated below in conjunction with preferred embodiment of the attached drawing to the utility model, it should be understood that described herein excellent
It selects embodiment to be only used for describing and explaining the present invention, is not used to limit the utility model.
The utility model discloses a kind of steel meshes for manual Reflow Soldering, are provided with several for manual Reflow Soldering
The aperture of paste solder printing is carried out when connecing, aperture includes the first aperture 21 for intensive 11 paste solder printing of pad, wherein intensive weldering
Disk 11 is made of the corresponding multiple intensive pads 111 of son of the multiple pins in more 32 the same sides of pin component, and single first opens
Hole 21 is directly across the single intensive pad 11.
For intensive pad 11, very close, the adjacent intensive pad 111 of son is arranged between the intensive pad 111 of son
Between spacing very little, and the width of the intensive pad 111 of son is also smaller, it has not been convenient to open respectively for the intensive pad 111 of every height
If the aperture of paste solder printing, therefore open up the first aperture 21 across single intensive pad 11.It effectively overcomes for circuit
On plate 1 for intensive pad 11, the problem that steel mesh aperture is inconvenient, aperture difficulty is big effectively improves the production effect of steel mesh
Rate reduces the welding cost of small lot component 3, meanwhile, improve manual reflow soldering efficiency.
When carrying out reflow soldering, due to phenomenon of solder rising, as long as the control of paste solder printing amount is rationally, between intensive pad 111
It can be all attached to after tin cream fusing on neighbouring pin 31, without will cause the adhesion between pin 31.And the number to be printed master of tin cream
To depend on the thickness d of steel mesh and the size of aperture (including the first aperture 21 and the second aperture).
In the above-described embodiments, as shown in fig. 1~fig. 5, steel mesh is planar sheet, and the first aperture 21 is rectangle, ruler
Very little satisfaction:
L=(D+d) n-d,
W<l
Wherein, 21 length of the L: the first aperture, D: the width of the intensive pad 111 of son, d: the spacing of adjacent intensive pad, n: son
The quantity of intensive pad 111；The width of W: the first aperture 21, l: the length of the intensive pad 111 of son.
Preferably, the width W of single first aperture 21 are as follows:
0.5c≤H≤c
Wherein, 21 width of the W: the first aperture, D: the width of the intensive pad 111 of son, k: the folder of pin 31 and intensive pad 111
Angle, p1: solder proportion, p in tin cream ingredient2: scaling powder proportion in tin cream ingredient, H ': manual reflow soldering steel mesh
Thickness, H: the height of tin cream meniscus 41, c: 31 thickness of pin.
Specifically, the width W calculation method of the first aperture 21 is as follows:
As shown in figure 4, the welding to component 3, the wedge shape space below the heel of pin 31 is all filled by tin cream 4,
Height H at its tin cream meniscus 41 should at least be equal to the half of 31 thickness of pin, and preferably equal to 31 thickness of pin, therefore every
Scolding tin volume V needed for a pin 312For
In formula, w: the width of the intensive pad 11 of son, k: the angle of pin and the intensive pad 111 of son.
Due in tin cream 4 solder and scaling powder can be evaporated in solder reflow process, lead to the reduction of 4 volume of tin cream,
Therefore
(1-p1-p2)·V1=V2
In formula, p1: solder proportion, p in tin cream ingredient2: scaling powder proportion, V in tin cream ingredient1: paste solder printing
When each pad on tin cream volume.
Since the shape that tin cream meniscus 41 and pin 31 are formed can be obtained similar to triangle:
In formula, n is 31 numbers of pin, and the L: the first aperture 21 is long, and the W: the first aperture 21 is wide, H ': the steel of manual reflow soldering
Thickness of net.
Joint type (1)-(3):
In the above-described embodiments, the thickness d of steel mesh meets: 0.20mm≤d≤0.3mm.It is used in general reflow soldering
Steel mesh thickness is usually no more than 0.2mm, usually in 0.15mm.
In the present embodiment, the thickness of steel mesh is less than 0.2mm, by using thicker steel mesh, facilitates production for tin cream
The aperture of printing, and in paste solder printing, convenient for steel mesh is fixed on the circuit card 1.It is particularly suitable for small lot component 3
Manual reflow soldering can efficiently solve rosin joint during manual welding, de- in conjunction with manual welding and the respective advantage of Reflow Soldering
The problems such as weldering, burn-through, low yield rate, improves the welding efficiency of small lot component 3；At the same time it can also be effectively reduced reflux
Welding steel net cost of manufacture, thereby reduces welding cost.
In the present embodiment, aperture further includes that the second aperture of paste solder printing is carried out for non-dense set pad 12, for non-close
For foot type device, identical as dosage when machine Reflow Soldering in order to control tin cream dosage, the size of the second aperture is relative to non-
The corresponding pad size scaled down of intensive pad 12.Specifically, the size calculating of the second aperture is as follows on the steel mesh:
VTin=l1w1h1=l2w2h2
In formula, l1: the length of pad, w1: the width of pad；l2: the length of the second aperture, w2: the width of the second aperture；h1: machine SMT
Weld steel mesh thickness, h2: steel mesh thickness.
It can thus be concluded that
In the above-described embodiments, the making material of steel mesh is metal or plastics.
Aperture is made in the way of laser, electroforming, etching etc..
In one embodiment, circuit board 1 as shown in Figure 4, using steel mesh to circuit board 1 carry out component 3 (including
More pin components 32 and common component) welding, wherein more pin components 32 share the intensive pin of 4 rows, every row's packet
Include 12 pins 31；Wherein, the 0.2mm of 31 thickness of single pin, about 15 ° of angle of single pin 31 and the intensive pad 111 of son,
Length 1.8mm, the width 0.3mm of the intensive pad 111 of the corresponding son of single pin 31, between son 111 pad of intensive pad between
Away from 0.3mm.For the circuit board 1, steel mesh 2 is made using the aluminium flake of 0.2mm thickness, is computed, intensive pad 11 on circuit board 1
Locating corresponding first aperture Design of length is 6.6mm, wide to be designed as 0.63mm.Then carved according to the bore size of design using laser
Quarter, machine carried out aperture on aluminium flake, obtained steel mesh 2 as shown in Figure 3.
Other contents of steel mesh described in the utility model for manual Reflow Soldering are no longer superfluous herein referring to the prior art
It states.
The above descriptions are merely preferred embodiments of the present invention, not makees in any form to the utility model
Limitation, therefore it is all without departing from the content of the technical scheme of the utility model, implement according to the technical essence of the utility model to above
Any modification, equivalent variations and modification, are still within the scope of the technical solutions of the present invention made by example.
Claims (7)
1. a kind of steel mesh for manual Reflow Soldering, is provided with several apertures for being used to carry out paste solder printing, feature exists
In: the aperture includes the first aperture for intensive pad paste solder printing, and the intensive pad is same by more pin components
The single intensive weldering is directly crossed in the corresponding multiple intensive pad compositions of son of the multiple pins in side, single first aperture
Disk.
2. steel mesh according to claim 1, it is characterised in that: the steel mesh is planar sheet, and first aperture is in length
Rectangular, size meets:
L=(D+d) n-d,
W<l
Wherein, the L: the first aperture length, D: the width of the intensive pad of son, d: the spacing of the adjacent intensive pad of son, n: the intensive weldering of son
The quantity of disk；W: the first aperture widths, l: the length of the intensive pad of son.
3. steel mesh according to claim 2, it is characterised in that: the width W of single first aperture are as follows:
0.5c≤H≤c
Wherein, the W: the first aperture widths, k: the angle of pin and the intensive pad of son, p1: solder proportion, p in tin cream ingredient2:
Scaling powder proportion in tin cream ingredient, H ': the thickness of steel mesh, H: the height of tin cream meniscus, c: pin thickness.
4. steel mesh according to claim 1, it is characterised in that: the thickness d of steel mesh meets: 0.20mm≤d≤0.3mm.
5. steel mesh according to claim 4, it is characterised in that: the aperture further includes carrying out tin cream for non-dense set pad
Second aperture of printing, size scaled down of the size of second aperture relative to non-dense set pad.
6. steel mesh according to claim 1, it is characterised in that: the making material of steel mesh is metal or plastics.
7. steel mesh according to claim 1, it is characterised in that: the aperture is made using laser, electroforming, etching mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821146486.XU CN208724264U (en) | 2018-07-19 | 2018-07-19 | A kind of steel mesh for manual Reflow Soldering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821146486.XU CN208724264U (en) | 2018-07-19 | 2018-07-19 | A kind of steel mesh for manual Reflow Soldering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208724264U true CN208724264U (en) | 2019-04-09 |
Family
ID=65974228
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821146486.XU Expired - Fee Related CN208724264U (en) | 2018-07-19 | 2018-07-19 | A kind of steel mesh for manual Reflow Soldering |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208724264U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109310012A (en) * | 2018-07-19 | 2019-02-05 | 广州市建筑科学研究院有限公司 | A kind of steel mesh and the manual reflow soldering method using the steel mesh |
| CN113714745A (en) * | 2021-09-13 | 2021-11-30 | 苏州欧方电子科技有限公司 | Local electroforming steel mesh processing technology based on micro-welding technology |
-
2018
- 2018-07-19 CN CN201821146486.XU patent/CN208724264U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109310012A (en) * | 2018-07-19 | 2019-02-05 | 广州市建筑科学研究院有限公司 | A kind of steel mesh and the manual reflow soldering method using the steel mesh |
| CN113714745A (en) * | 2021-09-13 | 2021-11-30 | 苏州欧方电子科技有限公司 | Local electroforming steel mesh processing technology based on micro-welding technology |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Su Jian Inventor after: Mei Minzhang Inventor after: Li Jieming Inventor after: Liu Zizhen Inventor before: Su Jian Inventor before: Mei Minzhang Inventor before: Li Jieming Inventor before: Liu Zizheng |
|
| CB03 | Change of inventor or designer information | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190409 Termination date: 20200719 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |