CN203236133U - Micro brazing lap joint connector - Google Patents
Micro brazing lap joint connector Download PDFInfo
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- CN203236133U CN203236133U CN 201320080255 CN201320080255U CN203236133U CN 203236133 U CN203236133 U CN 203236133U CN 201320080255 CN201320080255 CN 201320080255 CN 201320080255 U CN201320080255 U CN 201320080255U CN 203236133 U CN203236133 U CN 203236133U
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- copper base
- lap joint
- brazing
- web plate
- copper substrate
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Abstract
A micro brazing lap joint connector belongs to the technical field of material connection. The micro brazing lap joint connector is formed by two dog-bone-shaped sheet copper substrates which are in brazing lap joint. One end of each copper substrate is thin and long and can serve as the neck portion, the other end of each copper substrate is wide and can serve the tail portion, a hole is punched in the center of the tail portion of each copper substrate, the thickness of each copper substrate is 0.2mm to 0.6mm, the width of the neck portion of each copper substrate is 0.5mm to 1mm, the width of the tail portion of each copper substrate is 3mm to 5mm, the hole is punched on the tail portion at the position on the center line of each copper substrate and 2mm to 5mm far away from the tail end, and the diameter of the punched hole is between 0.8mm to 2.5mm. By means of the micro brazing lap joint connector, the sizes of welding connectors are guaranteed. In addition, the number of the welding connector formed at one time is large.
Description
Technical field
The utility model is a kind of new miniature soldering lap joint, belongs to the Material Joining Technology field, is applied to the reliability consideration of mechanics, calorifics and the electricity of microelectronics connection.This joint can effectively be controlled the size of solder joint, and weld width and welding quality realize the easy of soldering lap joint, batch making.
Background technology
Microelectronics is connected to and plays mechanical connection and electrical connection in the electronic product, and the reliability of jointing has determined the service life of electronic product, so the reliability consideration of mechanics, calorifics and the electricity of microelectronics connection receives much concern always.Especially in the official approval WEEE of European Union and RoSH instruction, mandatory requirement has evoked industrial quarters and scientific circles especially for the broad research of lead-free brazing reliability of solder joints since the leadless electronic product is sold in the European market.Electronics manufacturer is paid close attention to the reliability evaluation of Lead-Free Solder Joint, and the researcher more pays close attention to the failure mechanism of Lead-Free Solder Joint.
One of key issue of reliability consideration is exactly selecting of soldered fitting, should meet industrial actual conditions, is convenient to again launch abstract scientific research.Welding spot size has been along with the development of microminiaturization has been reduced to the micron number magnitude in the actual electronic product, and will bear shear stress, the complex load of alternating temperature-changing and high current density, and this making with regard to Welded Joints is had higher requirement.At first, the size of welding point will guarantee in hundred micron levels; Secondly, welding point can conveniently carry out the test of properties, such as mechanical stretch, loads high current density, microscopic structure observation etc.; At last, welding point can the standardization batch making, with adapt to must the property data accumulation requirement.
At present correlative study and joint that document uses all are according to researcher's self-demand designed, designed usually, do not have corresponding industry standard.Such as the banjo fixing butt jointing of design usually use to(for) the interested researcher of ELECTROMIGRATION PHENOMENON, yet the main tension stress load of joint of docking form, not identical with the solder joint stress of reality, therefore aspect reliability evaluation, have limitation, be only applicable to the evaluation of electricity reliability.In addition, owing to weld width need to guarantee in hundred micron levels, so solder will reach corresponding size.Usually adopt in the research in the past the solder piece is rolled into thin slice, reached the size of weld seam.There are two defectives in this way, and on the one hand from material itself, being rolled down to a certain degree just for the fragility solder can cracking, so is difficult to reach hundred microns yardstick; On the other hand, sample needs to make one by one during with the solder sheet, respectively the solder sheet is attached on the welding substrate, makes like this inconvenience, also is unfavorable for the uniformity of sample quality simultaneously.
The utility model content
The purpose of this utility model is to overcome above-mentioned welding point to make complicated, the quality homogeneity is poor, shortcoming that can not batch making, simultaneously can the butt welding point size, weld width is controlled, and guarantee the uniformity of quality of weld joint, satisfied the requirement that to carry out simultaneously the reliability testing of the each side such as mechanics, calorifics and electricity.
To achieve these goals, the utility model has adopted following technical scheme.
Miniature soldering lap joint, it is characterized in that, lap joint is that the thin slice copper base of two dog-bone overlaps by soldering, and wherein an end of the thin slice copper base of dog-bone is elongated, as neck, elongated neck finish is as welding ends, and the other end of copper base is wide, as afterbody, and afterbody center punching, copper base 1 thickness is 0.2mm-0.6mm, neck width 0.5mm-1mm, tail width 3mm-5mm.The afterbody punch position on the copper base center line, apart from terminal 2mm-5mm all can, the bore dia of punching remains between the 0.8mm-2.5mm.
Overlap the method for above-mentioned miniature soldering lap joint, the equipment of employing comprises brush cream mould 3, web plate 4 etc., may further comprise the steps:
(1) prepares or chooses the thin slice copper base of above-mentioned dog-bone;
(2) secondly improve in the selection of welding material, abandoned the method for traditional rolling solder sheet, select soldering paste 2 as welding material, soldering paste 2 generally can be selected conventional commercially available SnAgCu series, SnBi is serial, SnPb is serial and SnZn is serial etc. all can.The use of soldering paste 2 can effectively guarantee width and the shape of weld seam.
(3) then brush cream mould 3 and web plate 4 have been designed according to the geomery of copper base 1, aid as the soldering paste coating, have and the identical groove of copper base 1 shape at brush cream mould 3, the thickness of fluting is identical with the thickness of copper base 1, reach groove and copper base 1 is complementary, copper base 1 is placed on just in the groove of brush cream mould 3, prevent moving horizontally of copper base 1, copper base 1 upper surface and brush cream mould 3 surfaces are maintained at the same horizontal plane, on brush cream mould 3, can disposablely open a plurality of identical grooves, carry out simultaneously the soldering paste application job of a plurality of copper bases 1; The thickness of web plate 4 requires width consistent with the weld seam of joint, generally between 100um-500um, needs to beat square opening at web plate 4, and the width of hole dimension is identical with copper base 1 neck width, and length guarantees between 0.5mm-1mm.The neck finish of fluting is corresponding on the quantity of square opening and arrangement requirement and the brush cream mould 3.To brush in cream mould 3 grooves and fill up after the copper base 1, web plate 4 will be covered on the brush cream mould 3, copper base 1 neck finish is exposed in web plate 4 square openings;
(4) be at last the welding job of soldering paste 2 coatings and copper base 1, adopt scraper 5 that soldering paste 2 is got and be placed in right amount the position beyond the square opening on the web plate, use scraper 5 to push down web plate 4, and and web plate be skewed drive soldering paste 2 and streak all square opening positions on the web plate 4, soldering paste 2 can be packed into square opening, be coated to the position of copper base 1 neck finish, then vertically take web plate 4 away, square opening has guaranteed shape and the coating position of soldering paste 2 in this process, the thickness of web plate 4 has been determined the thickness of soldering paste 2, the width of weld seam after namely welding, from brush cream mould 3, take out the copper base 1 of having brushed cream, then get in addition the copper base 1 of not brushing cream, its end lap on soldering paste 2, is put into the reflow soldering welding and got final product.
Copper base 1 shape in the utility model, being used in conjunction with of brush cream mould 3 and web plate 4 is the key point of making welding point.Copper base need to satisfy the loading of various load in the test process, copper base 1 tail width design is the mechanical grip when making things convenient for mechanical test, the punching of tail end center is in order to the loading of creep test process permanent load (suspension counterweight), elongated neck portion design is beneficial to and is obtaining higher current density in electrical testing to reduce the joint cross-sectional area.Brush cream mould 3 plays the effect of fixed copper substrate 1, and when making simultaneously copper base 1 insert brush cream mould 3, the surface of copper base 1 and brush cream mould 3 is on same level.The neck front end that web plate 4 position of opening and brush cream mould 3 are slotted is corresponding.When covering on the brush cream mould 3, should just in time spill the copper base 1 neck front end that needs the coating soldering paste to half tone 4.The thickness of web plate 4 has determined coating height, i.e. weld width.The utility model has the advantage of shape and the coating solder paste thickness that to control uniformly soldering paste, guarantee the size of welding point; One-shot forming quantity is many, and same batch of welding quality is consistent; The simultaneously design of copper base can be satisfied stretching, creep, and the various requirement of electro-migration testing obtains comprehensive welding spot reliability evaluation.
Description of drawings
Fig. 1: welding point profile and top view;
Top is profile, and following is top view;
Fig. 2: brush cream mould top view and profile;
Top is top view, and following is profile;
Fig. 3: web plate top view and profile;
Top is top view, and following is profile;
Fig. 4: brush cream process installation diagram;
1-copper base among the figure, 2-soldering paste, 3-brush cream mould, 4-web plate, 5-scraper plate.
Concrete embodiment
Following content is specifically set forth embodiment of the present utility model by reference to the accompanying drawings, fluting can according to circumstances have different numbers in the brush cream mould of the present utility model, as 1-8 all can, then the arrangement of mesh is corresponding with the groove in the brush cream mould with position relationship in the web plate.
Soldering paste 2 generally is kept in the refrigerator, needs in advance 4-8h to take out from refrigerator and is placed on the room temperature environment to recover the viscosity of soldering paste, also needs fully to stir before using.The copper base 1 that processes by specification need to carry out the processing of deoxidation film and surface contaminant, and detailed process is divided into two steps: at first copper base 1 is put into the 30%HNO for preparing
3Soak a few minutes in the solution, remove oxide on surface; Then copper base 1 is put into further ultrasonic cleaning of acetone, cleaned complete dry for standby.Brush cream mould 3 before the experiment, web plate 4 need to need to guarantee the penetrating of mesh with alcohol or acetone wiped clean, especially web plate 4 with scraper 5, the most handy Compressed Gas purges mesh.
Raw material and aid be ready can to begin to carry out welding sequence.At first copper base 1 is put into brush cream mould 3.Then web plate 4 is covered on the brush cream mould 3 and carry out the mesh contraposition, guarantee that copper base 1 neck leading portion all is exposed in the mesh.Then get an amount of soldering paste 2 and be placed on the web plate 4, carry out the soldering paste coating with scraper plate 5.Scraper plate 5 is pushed down web plate 4, drives soldering paste with about miter angle and at the uniform velocity slips over mesh in the mode of rolling, and makes mesh fill full weld cream 2.Vertically take at last web plate 4 away, can obtain to have applied the copper base 1 of soldering paste 2.Will apply the copper base 1 of soldering paste 2 take out, the copper base 1 that other gets a uncoated soldering paste is put into reflow soldering by the overlapping mode of Fig. 1 and is welded, and can obtain miniature lap brazing joint.
Example: the making of Sn58Bi eutectic solder lap joint.
1, solder is prepared: 4-8h takes out commercially available Sn58Bi soldering paste from refrigerator in advance, places at room temperature;
2, copper base is prepared: preparation 30%HNO
3Solution is put into this solution with copper base 1 and is soaked a few minutes taking-up, rinses well with clear water; Then use acetone soln ultrasonic cleaning 5min.With cleaned copper base dry for standby;
3, brush cream mould, web plate, scraper plate are prepared: will brush cream mould 3, web plate 4, scraper plate 5 wiped clean with acetone or alcohol for subsequent use; Purge the mesh of web plate with Compressed Gas, make mesh penetrating, can not comprise last use rear remaining lotion or dust;
4, web plate contraposition: copper base is put reality in brush cream mould, carry out contraposition above then web plate being covered, guarantee that the position of copper base neck leading portion welding all is exposed in the mesh, then fixed network board;
5, brush cream: stir soldering paste to increase soldering paste viscosity; Get an amount of soldering paste and be placed on the web plate, push down web plate with scraper plate and drive the soldering paste rolling, angle 45 degree are advisable between scraper plate and web plate.It is moderate that scraper plate scrapes in the process dynamics, at the uniform velocity scrapes, and scrapes to guarantee to fill in the mesh full lotion 2 for 1-2 time;
6, take web plate away: vertically take fast web plate away, perpendicularity and the height of the broken ring of one side lotion;
7, get coating soldering paste and each a slice of copper base uncoated, place by overlapping mode shown in Figure 1, put into the reflow soldering welding and get final product.
Claims (1)
1. miniature soldering lap joint, it is characterized in that, lap joint is that two thin slice copper bases overlap by soldering, and wherein an end of thin slice copper base is elongated, as neck, elongated neck finish is as welding ends, and the other end of copper base is wide, as afterbody, and afterbody center punching, copper base thickness is 0.2mm-0.6mm, neck width 0.5mm-1mm, tail width 3mm-5mm; The afterbody punch position on the copper base center line, apart from terminal 2mm-5mm all can, the bore dia of punching remains between the 0.8mm-2.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320080255 CN203236133U (en) | 2013-02-21 | 2013-02-21 | Micro brazing lap joint connector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320080255 CN203236133U (en) | 2013-02-21 | 2013-02-21 | Micro brazing lap joint connector |
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| Publication Number | Publication Date |
|---|---|
| CN203236133U true CN203236133U (en) | 2013-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320080255 Expired - Fee Related CN203236133U (en) | 2013-02-21 | 2013-02-21 | Micro brazing lap joint connector |
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| CN (1) | CN203236133U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103111700A (en) * | 2013-02-21 | 2013-05-22 | 北京工业大学 | Miniature soldering lapped joint and lapping method |
-
2013
- 2013-02-21 CN CN 201320080255 patent/CN203236133U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103111700A (en) * | 2013-02-21 | 2013-05-22 | 北京工业大学 | Miniature soldering lapped joint and lapping method |
| CN103111700B (en) * | 2013-02-21 | 2015-06-10 | 北京工业大学 | Miniature soldering lapped joint and lapping method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131016 Termination date: 20160221 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |