CN106624423B - A kind of enhanced welding column preparation facilities and preparation method - Google Patents
A kind of enhanced welding column preparation facilities and preparation method Download PDFInfo
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- CN106624423B CN106624423B CN201611156361.0A CN201611156361A CN106624423B CN 106624423 B CN106624423 B CN 106624423B CN 201611156361 A CN201611156361 A CN 201611156361A CN 106624423 B CN106624423 B CN 106624423B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0205—Non-consumable electrodes; C-electrodes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
- B23K35/402—Non-consumable electrodes; C-electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/74—Apparatus for manufacturing arrangements for connecting or disconnecting semiconductor or solid-state bodies
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Abstract
A kind of enhanced welding column preparation facilities and preparation method, belong to ceramic electronic component encapsulation field.The device includes welding wire feed mechanism, copper strips winding mechanism, copper strips immersed solder mechanism and welding wire cutting mechanism, straight welding wire is provided using welding wire feed mechanism, certain thickness copper strips is wound on welding wire by copper strips winding mechanism, by copper strips immersed solder mechanism by entire welding wire outer surface wicking, obtain enhanced welding wire, and send to after welding wire cutting mechanism is flattened and cut off, obtain more enhanced welding columns.The present invention compensates for the case where current country can not independently prepare enhanced welding column, and apparatus of the present invention and method are easy to operate, can guarantee that the welding column of preparation has good surface state and end face planarization.
Description
Technical field
The present invention relates to a kind of enhanced welding column preparation facilities and preparation methods, belong to ceramic electronic component encapsulation neck
Domain.
Background technique
The rapid development of modern integrated circuits technology, miniaturization, high speed and the high reliability request electronics member of integrated circuit
Device promotes new encapsulation technology also to continuously emerge and develop therewith to miniaturization and integrated transformation.Ceramic Balls grating array
Column encapsulation as a kind of packing forms of BGA Package has that interconnection density is high, air-tightness is strong, moisture resistance properties are good and reliably
Property it is high the advantages that, ceramic column array encapsulation be ceramic ball grid array package development and improvement, with column grid replace ball bar, significantly
Link is between alumina ceramic envelope and glass epoxy printed board since thermal expansion is to mismatch bring heat fatigue to ask
Topic, to improve the reliability of assembling.Ceramic column array encapsulation has high temperature resistant, high pressure resistant and highly reliable characteristic, fits
For large scale and highdensity situation.Therefore it occupies an important position in military, aerospace Electronic products manufacturing field.
But the preparation of welding column becomes always the key factor for restricting the encapsulation of China's ceramic column array, ceramic column array encapsulation weldering used
Column mainly has a 90Pb10Sn routine welding column and two kinds of enhanced welding column, enhanced welding column due to its welding column itself material properties,
Compared to its workability with higher package reliability and product of conventional welding column.For preparation angle, enhanced weldering
For column compared with 90Pb10Sn routine welding column, enhanced welding column is composite structure, by the winding of scolding tin column surface copper strips and
63Sn37Pb infiltration, enhances the intensity of welding column itself, and structure is more complicated, and preparation difficulty is higher.
Currently, external only a company (the 6-Sigma company in the U.S.) has enhanced welding column preparation production capacity,
The enhanced welding column of production has been widely used in during highly reliable integrated circuit ceramic packaging technology, the TOPLINE in the U.S.
Company is researching and developing the technology of preparing of enhanced welding column, but still immature.The country does not have the technology of enhanced welding column preparation still
Ability only can independently prepare 90Pb10Sn routine welding column.
Summary of the invention
The technology of the present invention solves the problems, such as: overcoming the deficiencies of the prior art and provide a kind of enhanced welding column preparation facilities
And preparation method.
The technical solution of the invention is as follows: a kind of enhanced welding column preparation facilities, including welding wire feed mechanism, copper strips twine
Cutting mechanism is flattened around mechanism, copper strips immersed solder mechanism and welding wire；
The welding wire feed mechanism is for transmitting straight welding wire to copper strips winding mechanism；Copper strips winding mechanism was transmitting
The welding wire surface spiral winding copper strips at a certain angle come；Copper strips immersed solder mechanism infiltrates one layer of weldering in the welding wire surface of winding copper strips
Tin welds together copper strips and welding wire closely, obtains enhanced welding wire, and sends welding wire leveling cutting mechanism to；Welding wire is whole
Truncation breaking mechanism first flattens enhanced welding wire, and then length as requested cuts off welding wire, obtains more enhancings
Type welding column.
The welding wire feed mechanism includes welding wire transfer structure and the first welding wire leveling structure；
Welding wire transfer structure includes the bracket that a rotary screw and one are used to fix rotary screw, is put on rotary screw
It is set to the welding wire of volume；
First welding wire leveling structure includes multiple groups idler wheel, and multiple groups idler wheel is symmetrically located at welding wire two sides up and down, tight with welding wire
Closely connected co-clip is tight, can be flattened in advance from upper and lower surface by welding wire, and welding wire is transmitted outward.
The copper strips winding mechanism includes limit hole and casing, copper strips transfer structure and spiral winding structure；
Casing is located in limit hole, and the welding wire of casing and limit hole cooperation for sending welding wire feed mechanism carries out
Precision leveling；
Spiral winding structure can rotate 360 ° driven by the motor along welding wire, and copper strips transfer structure is fixed on spiral shell
It revolving on winding arrangement, copper strips transfer structure includes a pair of of idler wheel, which sends copper strips to welding wire for clamping copper strips,
Copper strips is wrapped on welding wire under the rotation of spiral winding structure.
Copper strips immersed solder mechanism includes scaling powder infiltration structure and wetting structure；
It includes the first groove, the first roller group and warm table that scaling powder, which infiltrates structure, and first groove is helped for placing
Solder flux, and through-hole is machined in the first recess sidewall above scaling powder；First roller group is located in the first groove, welding wire energy
It is enough to enter in the first roller group across through-hole, first roller group guarantee welding wire can complete wetting in scaling powder, heating
Platform guarantees that scaling powder can flow and have adhesiveness for heating scaling powder in the first groove；
Wetting structure includes the second groove, the second roller group, heater and temperature control system, and second groove is used for
Solder is placed, and is machined with through-hole in the second recess sidewall above solder；Second roller group is located in the second groove, welding wire
Through-hole can be passed through to enter in the second roller group, second roller group guarantee welding wire can complete wetting in solder；Heating
Device melts the solder in the second groove all, and temperature control system is maintained at temperature in the second groove within the scope of proper temperature.
The welding wire leveling cutting mechanism includes that the second welding wire leveling structure and welding wire cut off structure；
Second welding wire leveling structure includes multiple groups idler wheel, and multiple groups idler wheel is symmetrically located at enhanced welding wire two sides up and down, with
Enhanced welding wire fits closely clamping, for being flattened in advance from upper and lower surface by enhanced welding wire, and transmits outward；
Welding wire cutting structure includes set of blades and air motor, and the set of blades includes two blades, between two blades
Away from identical as the length to be cut off, the cutting direction of two blades is vertical with welding wire direction of transfer；Air motor and external compression
Air communication, air motor push out set of blades under the action of compressed air, realize and cut off to welding wire.
The method for preparing enhanced welding column using the preparation facilities, includes the following steps:
(1) welding column preparation facilities is powered on and gas source, tests its electricity, gas is all connected with normally；
(2) coiled welding wire is put into welding wire feed mechanism, copper strips is put into copper strips feed mechanism, it will using tweezers
The end of welding wire and copper strips penetrates in preparation facilities, adjusts the height of welding wire feed mechanism, to guarantee welding wire level；
(3) heating temperature of warm table is set in scaling powder infiltration structure as 80 DEG C~150 DEG C, wetting structure
The upper heater heating temperature that sets stablizes 10min after waiting actual temperature to reach set temperature as 230 DEG C~250 DEG C；
(4) motor controlled in welding wire feed mechanism and the welding wire leveling idler wheel of cutting mechanism, copper strips winding mechanism starts
Operation makes enhanced welding column preparation facilities start to work, carries out the preparation of enhanced welding column；
(5) the enhanced welding column prepared is screened and is cleaned；
(6) power supply and gas source are closed after the completion of preparation.
Compared with prior art, the invention has the following beneficial effects:
1, apparatus of the present invention are easy to operate, and high degree of automation is, it can be achieved that prepared by the batch of enhanced welding column.
2, the welding wire straightened of high-curl-flexibility can be such that welding wire surface zero damages by welding wire feed mechanism by welding wire leveling,
Conducive to the winding of subsequent copper band and immersed solder process.
3, copper strips can be spirally wound at a certain angle welding wire surface, welding wire surface in winding process by copper strips winding mechanism
Damage small, winding angle consistency is good, and copper strips and welding wire surface gap are less than 50 μm after winding, effective guarantee subsequent copper band immersed solder
Quality.
4, copper strips immersed solder mechanism can be by one layer of solder on welding wire and copper strip surface immersed solder, and forms copper strips with welding wire surface
Good welds can make in welding wire voidage less than 1%, immersed solder solder thickness precision is better than ± 20 μm by controlling temperature；
5, welding wire cutting mechanism pushes blade to cut off enhanced welding wire by air motor, can be by enhanced welding wire
The welding column of Cheng Duogen regular length is automatically cut off, extension consistency is better than ± 20 μm, and the circularity peace shaping of welding column end is good.
Detailed description of the invention
Fig. 1 is enhanced welding column preparation facilities schematic diagram；
Fig. 2 is welding wire feed mechanism schematic diagram；
Fig. 3 is copper strips winding mechanism schematic diagram；
Fig. 4 is copper strips immersed solder structural scheme of mechanism；
Fig. 5 is that welding wire flattens cutting mechanism schematic diagram.
Specific embodiment
Below with reference to embodiment, the present invention is described in further detail:
The present invention proposes a kind of enhanced welding column preparation facilities, as shown in Figure 1, including welding wire feed mechanism 1, copper strips winding
Mechanism 2, copper strips immersed solder mechanism 3 and welding wire flatten cutting mechanism 4.
Welding wire feed mechanism 1 is for transmitting straight welding wire to copper strips winding mechanism 2, and as shown in Fig. 2, including welding wire passes
Structure 11 and the first welding wire is sent to flatten structure 12, welding wire transfer structure 11 includes that a rotary screw and one are revolved for fixed
Turn the bracket of screw rod, coiled welding wire is placed on rotary screw, welding wire feed mechanism 1 is adjusted to suitable height, it is ensured that weldering
Silk is in horizontal movement in whole device.It includes multiple groups idler wheel that first welding wire, which flattens structure 12, and multiple groups idler wheel is symmetrically located at
Welding wire two sides such as three groups of idler wheels up and down, welding wire each three idler wheels up and down, fit closely clampings with welding wire, can be from upper and lower surface by weldering
Silk is flattened in advance, and welding wire is transmitted outward.
Copper strips winding mechanism 2 is in the welding wire surface sent spiral winding copper strips at a certain angle.As shown in figure 3, copper
Band winding mechanism 2 includes limit hole 21 and casing 22, copper strips transfer structure 23 and spiral winding structure 24.
Casing 22 is located in limit hole 21, and casing 22 and the cooperation of limit hole 21 are for sending welding wire feed mechanism 1
Welding wire carry out accurate leveling.Casing is made of flexible material, and placement causes to damage to welding wire, the outer diameter and limit of casing
The internal diameter in position hole is consistent, and casing thickness is 0.55mm or so.
Spiral winding structure 24 can rotate 360 ° driven by the motor along welding wire, and copper strips transfer structure 23 is fixed
On spiral winding structure 24, copper strips transfer structure 23 includes a pair of of idler wheel, which is used to clamp copper strips, and with certain speed
It sends copper strips to welding wire, copper strips is wrapped on welding wire under the rotation of spiral winding structure 24.It can be passed by adjusting copper strips
The angle between structure 23 and spiral winding structure 24 is sent, tilt angle when copper strips winding and the spacing of copper strips winding are adjusted.
The present invention makes copper strips be fitted tightly over welding wire surface by the precision-fit of each mechanism, without 50 μm or more between copper strips and welding wire
Gap ensures subsequent copper band immersed solder effect.
Copper strips immersed solder mechanism 3 infiltrates one layer of scolding tin in the welding wire surface of winding copper strips, is welded on copper strips and welding wire closely
Together, enhanced welding wire is obtained, and sends welding wire leveling cutting mechanism 4 to.As shown in figure 4, copper strips immersed solder mechanism 3 includes helping weldering
Agent infiltrates structure 31 and wetting structure 32.
Scaling powder infiltration structure 31 is main to make the welding wire of surface wrap copper strips at the uniform velocity smoothly pass flux bath by idler wheel,
It applies its surface and applies uniform one layer of scaling powder.It includes the first groove 311, the first roller group 312 that scaling powder, which infiltrates structure 31,
With warm table 313, first groove 311 adds for placing scaling powder, and on 311 side wall of the first groove above scaling powder
Work has through-hole；First roller group 312 is located in the first groove 311, and welding wire can pass through through-hole and enter in the first roller group 312,
First roller group 312 guarantee welding wire can complete wetting in scaling powder, warm table is for will help weldering in the first groove 311
Agent is heated to proper temperature, and scaling powder is made to have certain mobility and adhesiveness.
Wetting structure 32 welds the welding wire of coated scaling powder.Wetting structure 32 includes the second groove
321, the second roller group 322, heater 323 and temperature control system 324, second groove 321 are being welded for placing solder
Expect to be machined with through-hole on 321 side wall of the second groove of top；Second roller group 322 is located in the second groove 321, and welding wire can
Enter in the second roller group 322 across through-hole, second roller group 322 guarantee welding wire can complete wetting in solder；Add
Hot device 323 melts the solder in the second groove 321 all, and temperature control system 324 makes temperature in the second groove 321 be maintained at appropriate
It is maintained in temperature range between 230 DEG C~250 DEG C, which can guarantee solder fusing, while guarantee welding quality.
Welding wire leveling cutting mechanism 4 first flattens enhanced welding wire, and then length as requested cuts welding wire
It is disconnected, obtain more enhanced welding columns.As shown in figure 5, welding wire leveling cutting mechanism 4 includes the second welding wire leveling structure 41 and welding wire
Structure 42 is cut off, it includes multiple groups idler wheel that the second welding wire, which flattens structure 41, and multiple groups idler wheel is symmetrically located at enhanced welding wire or more two
Side fits closely clamping with enhanced welding wire, for being flattened in advance from upper and lower surface by enhanced welding wire, and transmits outward.
Welding wire cut off structure 42 include set of blades and air motor, set of blades include two blades, the spacing of two blades with to cut off
Length it is identical, the cutting direction of two blades is vertical with welding wire direction of transfer；Air motor and external compression air communication, gas
Dynamic motor pushes out set of blades under the action of compressed air, realizes and cuts off to welding wire, forms sectional welding column.
It, can be by the roller group and control involved in apparatus of the present invention in order to further increase the degree of automation of this covering device
Device connection processed controls roller group work by controller.
For preparing the enhanced welding column of 80Pb20Sn, outer dimension is Ф 0.51mm, a height of 2.2mm；Chemical component
Middle lead content is 80%wt, Theil indices 20%wt.
Specific implementation step is as follows:
(1) welding column preparation facilities is powered on and gas source, tests its electricity, gas is all connected with normally；
(2) selection Ф 0.53mm casing is placed in limit hole, selection set of blades progress welding wire cutting, two in set of blades
The distance of blade is 2.2mm；
(3) coiled 80Pb20Sn welding wire is put into welding wire feed mechanism, 15 μ m-thick pure copper strips is put into copper strips supply
In mechanism.The end of welding wire and copper strips is penetrated in entire mechanism using tweezers, guarantees the level of welding wire；
(4) heating temperature is set as 80 DEG C~150 DEG C, in wetting on the warm table of scaling powder infiltration structure 31
Heating temperature is set on the heater of structure as 230 DEG C~250 DEG C, stablizes 10min after waiting actual temperature to reach set temperature；
(5) motor controlled in welding wire feed mechanism 1 and the welding wire leveling idler wheel of cutting mechanism 4, copper strips winding mechanism 2 is opened
Begin to run, so that enhanced welding column preparation facilities is started to work, carry out the preparation of enhanced welding column；
(6) the enhanced welding column prepared is screened and is cleaned；
(7) power supply and gas source are closed.
It is an object of the invention to change the case where current country can not independently prepare enhanced welding column, one kind is provided and is passed through
Welding wire leveling, copper strips winding, wicking and cutting mode prepare the device and method of enhanced welding column, device and method operation
Simplicity, and welding wire is automatically cut off by blade, it can guarantee that the welding column of preparation has good surface state and end face planarization.
The content that description in the present invention is not described in detail belongs to the well-known technique of professional and technical personnel in the field.
Claims (4)
1. a kind of enhanced welding column preparation facilities, it is characterised in that: including welding wire feed mechanism (1), copper strips winding mechanism (2),
Copper strips immersed solder mechanism (3) and welding wire leveling cutting mechanism (4)；
The welding wire feed mechanism (1) is used to transmit straight welding wire to copper strips winding mechanism (2)；Copper strips winding mechanism (2) exists
The welding wire surface sent spiral winding copper strips at a certain angle；Welding wire surface of the copper strips immersed solder mechanism (3) in winding copper strips
One layer of scolding tin is infiltrated, welds together copper strips and welding wire closely, obtains enhanced welding wire, and sends welding wire leveling cutting machine to
Structure (4)；Welding wire leveling cutting mechanism (4) first flattens enhanced welding wire, and then length as requested cuts welding wire
It is disconnected, obtain more enhanced welding columns；
The copper strips winding mechanism (2) includes limit hole (21) and casing (22), copper strips transfer structure (23) and spiral winding knot
Structure (24)；
Casing (22) is located in limit hole (21), and casing (22) and limit hole (21) cooperation are for passing welding wire feed mechanism (1)
The welding wire brought carries out accurate leveling；
Spiral winding structure (24) can rotate 360 ° driven by the motor along welding wire, and copper strips transfer structure (23) is fixed
On spiral winding structure (24), copper strips transfer structure (23) includes a pair of of idler wheel, and the idler wheel is for clamping copper strips, and by copper strips
It sends welding wire to, copper strips is wrapped on welding wire under the rotation of spiral winding structure (24)；
Copper strips immersed solder mechanism (3) includes scaling powder infiltration structure (31) and wetting structure (32)；
It includes the first groove (311), the first roller group (312) and warm table (313) that scaling powder, which infiltrates structure (31), and described the
One groove (311) is machined with through-hole on the first groove (311) side wall above scaling powder for placing scaling powder；First
Roller group (312) is located in the first groove (311), and welding wire can pass through through-hole and enter in the first roller group (312), and described first
Roller group (312) guarantee welding wire can complete wetting in scaling powder, warm table (313) in the first groove (311) for will help
Solder flux heating guarantees that scaling powder can flow and have adhesiveness；
Wetting structure (32) includes the second groove (321), the second roller group (322), heater (323) and temperature control system
(324), second groove (321) is for placing solder, and is machined on the second groove (321) side wall above solder logical
Hole；Second roller group (322) is located in the second groove (321), and welding wire can pass through through-hole and enter in the second roller group (322),
Second roller group (322) guarantee welding wire can complete wetting in solder；Heater (323) makes in the second groove (321)
Solder all melt, temperature control system (324) is maintained at the second groove (321) interior temperature within the scope of proper temperature.
2. a kind of enhanced welding column preparation facilities according to claim 1, it is characterised in that: the welding wire feed mechanism
It (1) include welding wire transfer structure (11) and the first welding wire leveling structure (12)；
Welding wire transfer structure (11) includes the bracket that a rotary screw and one are used to fix rotary screw, is put on rotary screw
It is set to the welding wire of volume；
First welding wire leveling structure (12) includes multiple groups idler wheel, and multiple groups idler wheel is symmetrically located at welding wire two sides up and down, tight with welding wire
Closely connected co-clip is tight, is flattened in advance from upper and lower surface by welding wire, and welding wire is transmitted outward.
3. a kind of enhanced welding column preparation facilities according to claim 1, it is characterised in that: the welding wire flattens cutting machine
Structure (4) includes the second welding wire leveling structure (41) and welding wire cutting structure (42)；
Second welding wire leveling structure (41) includes multiple groups idler wheel, and multiple groups idler wheel is symmetrically located at enhanced welding wire two sides up and down, with
Enhanced welding wire fits closely clamping, for being flattened in advance from upper and lower surface by enhanced welding wire, and transmits outward；
Welding wire cutting structure (42) includes set of blades and air motor, and the set of blades includes two blades, between two blades
Away from identical as the length to be cut off, the cutting direction of two blades is vertical with welding wire direction of transfer；Air motor and external compression
Air communication, air motor push out set of blades under the action of compressed air, realize and cut off to welding wire.
4. the method for preparing enhanced welding column using preparation facilities described in claim 1, it is characterised in that include the following steps:
(1) welding column preparation facilities is powered on and gas source, tests its electricity, gas is all connected with normally；
(2) coiled welding wire is put into welding wire feed mechanism, copper strips is put into copper strips feed mechanism, using tweezers by welding wire
It is penetrated in preparation facilities with the end of copper strips, adjusts the height of welding wire feed mechanism, to guarantee welding wire level；
(3) heating temperature of warm table is set in scaling powder infiltration structure (31) as 80 DEG C~150 DEG C, wetting structure
(32) heating temperature of heater is set on as 230 DEG C~250 DEG C, stablizes 10min after waiting actual temperature to reach design temperature；
(4) control welding wire feed mechanism (1) and welding wire flatten the idler wheel of cutting mechanism (4), the motor in copper strips winding mechanism (2)
It brings into operation, so that enhanced welding column preparation facilities is started to work, carry out the preparation of enhanced welding column；
(5) the enhanced welding column prepared is screened and is cleaned；
(6) power supply and gas source are closed after the completion of preparation.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611156361.0A CN106624423B (en) | 2016-12-14 | 2016-12-14 | A kind of enhanced welding column preparation facilities and preparation method |
| PCT/CN2017/113266 WO2018107958A1 (en) | 2016-12-14 | 2017-11-28 | Enhanced welding column fabrication device and fabrication method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611156361.0A CN106624423B (en) | 2016-12-14 | 2016-12-14 | A kind of enhanced welding column preparation facilities and preparation method |
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| CN106624423B true CN106624423B (en) | 2019-06-04 |
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| CN106624423B (en) * | 2016-12-14 | 2019-06-04 | 北京时代民芯科技有限公司 | A kind of enhanced welding column preparation facilities and preparation method |
| CN108422128B (en) * | 2018-01-31 | 2020-06-23 | 郑州机械研究所有限公司 | Preparation method of circular brazing flux cake coated with brazing flux |
| CN108788559A (en) * | 2018-07-26 | 2018-11-13 | 太仓巨仁光伏材料有限公司 | A kind of L-type welding process units |
| CN111618121B (en) * | 2020-06-24 | 2024-07-05 | 东莞市轩博机械设备有限公司 | Full-automatic metal hose machine |
| CN113113373A (en) * | 2021-04-08 | 2021-07-13 | 重庆群崴电子材料有限公司 | Enhanced packaging welding column and processing method thereof |
| CN113798410A (en) * | 2021-08-23 | 2021-12-17 | 北京航天光华电子技术有限公司 | Automatic tin ring winding tool |
| CN114986012A (en) * | 2022-06-06 | 2022-09-02 | 中国科学院宁波材料技术与工程研究所 | Composite columnar soft soldering material and preparation method and application thereof |
| CN115816829B (en) * | 2022-10-28 | 2024-02-23 | 南京航空航天大学 | 3D printing prepreg wire conveying and cutting function integrated device and operation method |
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| CN106624423A (en) | 2017-05-10 |
| WO2018107958A1 (en) | 2018-06-21 |
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