CN220612629U - Welding chopper for bonding - Google Patents
Welding chopper for bonding Download PDFInfo
- Publication number
- CN220612629U CN220612629U CN202322229302.3U CN202322229302U CN220612629U CN 220612629 U CN220612629 U CN 220612629U CN 202322229302 U CN202322229302 U CN 202322229302U CN 220612629 U CN220612629 U CN 220612629U
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- Prior art keywords
- bonding
- wire
- welding
- chamfer
- blade
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- 238000003466 welding Methods 0.000 title claims abstract description 68
- 229910052751 metal Inorganic materials 0.000 claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims description 16
- 238000005476 soldering Methods 0.000 claims description 12
- 239000000956 alloy Substances 0.000 claims description 9
- 229910000679 solder Inorganic materials 0.000 claims description 9
- 229910045601 alloy Inorganic materials 0.000 claims description 6
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 6
- 235000014820 Galium aparine Nutrition 0.000 claims description 5
- 240000005702 Galium aparine Species 0.000 claims description 5
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 5
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 claims description 4
- NEIHULKJZQTQKJ-UHFFFAOYSA-N [Cu].[Ag] Chemical compound [Cu].[Ag] NEIHULKJZQTQKJ-UHFFFAOYSA-N 0.000 claims description 4
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000011195 cermet Substances 0.000 claims description 4
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000004377 microelectronic Methods 0.000 abstract description 3
- 238000005520 cutting process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000007704 transition Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 229910001315 Tool steel Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004021 metal welding Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000012858 resilient material Substances 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
Landscapes
- Wire Bonding (AREA)
Abstract
The utility model discloses a welding chopper for bonding, which belongs to the technical field of microelectronic tools and comprises a chopper body, wherein the chopper body comprises a cutter head and a cutter body at the upper part, the bottom of the cutter head is provided with a groove, two sides of the groove are respectively provided with a first step and a second step, the bottom of the first step is provided with a working surface, the second step is provided with a wire guide hole, the wire guide hole penetrates through the second step, a bonding metal wire or a bonding metal belt penetrates through the wire guide hole, the working surface comprises a circular arc-shaped first chamfer and a circular arc-shaped second chamfer, and the radius of the first chamfer is r 1 The diameter of the bonding wire is R, R 1 ＝RX (85% -115%). According to the utility model, the first chamfer is arranged in the arc shape, and the radius of the arc is limited, so that the purposes that the welding strength is affected by welding infirm or welding spot damage caused by the fact that the welding of the two ends of the first welding spot or the second welding spot is caused by improper treatment of the shape and the size of the two ends of the welding pad of the welding surface in the prior art when the chopper is vibrated by ultrasonic waves are avoided.
Description
Technical Field
The utility model relates to the technical field of microelectronic tools, in particular to a welding chopper for bonding.
Background
The chopper is used as a key tool for micro assembly process in the microelectronics industry, and can use metal wires such as gold wires, gold belts, silicon aluminum wires, copper wires and the like, and heat, pressure and ultrasonic energy are utilized to enable the metal leads and the bonding pads of the substrate to be tightly welded, so that the electric interconnection between the chips and the substrate and the information intercommunication between the chips are realized. Under ideal control conditions, electron sharing or atomic interdiffusion can occur between the lead and the substrate, thereby realizing atomic level bonding between the two metals.
Wherein, ultrasonic welding (including thermosonic welding) presses the metal wire (belt) with the bonding wedge (knife tip) to press the metal wire (belt) on the metal bonding pad, then the knife body of the chopper inputs frequency of 20KHZ to 50KHZ, amplitude of 5 μm to 50 μm, ultrasonic pulse in parallel to the length direction of the metal wire, so that the knife tip generates horizontal elastic vibration and applies downward pressure. The chopper drives the lead to rapidly rub on the metal surface of the welding area under the action of the two forces, the lead is subjected to plastic deformation under the action of energy and is in close contact with the bonding area in a short time to finish welding; however, in daily work, the applicant found that improper handling of the shape and size of the two ends of the bonding pad on the bonding surface may cause the situation that the bonding strength is affected by the damage of the bonding pad or the bonding pad due to the weak bonding at the two ends of the first bonding pad or the second bonding pad when the chopper is vibrated by ultrasonic waves.
In view of this, the present application is specifically proposed.
Disclosure of Invention
The utility model aims to provide a welding chopper for bonding, which provides smooth and gentle transition between a working surface and a bonding wire by arranging a first chamfer into an arc shape and limiting the radius of the arc, so as to solve the problems that in the prior art, the shapes and the sizes of two ends of a bonding pad of the bonding surface are improperly treated, and when the chopper vibrates in an ultrasonic mode, the welding of two ends of a first welding spot or a second welding spot is unstable or the welding spot is damaged to influence the welding strength.
The embodiment of the utility model is realized by the following technical scheme: the utility model provides a welding riving knife for bonding, includes the riving knife body, and the riving knife body includes tool bit and upper portion's blade, and the tool bit bottom is provided with the recess, and the both sides of recess are provided with first step and second step respectively, and first step bottom is provided with the working face, is provided with the wire guide hole on the second step, and the wire guide hole runs through the second step, has bonding wire or bonding metal tape to pass in the wire guide hole, and the horizontal plane of wire guide hole lower part is higher than the horizontal plane that the working face is located; wherein the working surface comprises a circular arc-shaped first chamfer and a second chamfer, the distance between the first chamfer and the wire guiding hole is larger than that between the second chamfer and the wire guiding hole, and the radius of the circle where the first chamfer is positioned is r 1 The diameter of the bonding wire is R, R 1 ＝R×(85％-115％)。
Preferably r 1 ＝R。
Preferably, the blade body is provided with a lead hole which longitudinally penetrates the blade body.
Preferably, the blade and the cutter head are integrally formed, and the blade and the cutter head are made of the same material.
Preferably, the lead hole extends longitudinally through the tool bit, with the bottom of the lead hole being higher than the top of the lead hole.
Preferably, the blade is connected with the cutter head in a welding mode, and the materials of the blade and the cutter head are different.
Preferably, the soldering forms a soldering face, and the bottom of the lead hole is above the soldering face.
Preferably, the bonding wire is a gold wire, and the radius of the circle where the second chamfer is located is r 2 ，r 2 ＝R×(35％-65％)。
Preferably, the bonding wire is silicon aluminum wire, and the radius of the circle where the second chamfer is positioned is r 3 ，r 3 ＝R×(85％-115％)。
Preferably, the blade body is made of tungsten carbide alloy material, the tool bit is made of titanium carbide alloy or titanium nitride cermet material, and silver-copper brazing filler metal is selected as a welding agent for welding.
Compared with the prior art, the embodiment of the utility model has the following advantages and beneficial effects:
1. according to the welding chopper for bonding, the first chamfer and the second chamfer are arranged in the shape of the circular arc, the radius of the first chamfer is limited, the contact area between the first chamfer and the second chamfer and the bonding wire is increased, the wire is more attached to the welding surface, the welding process is smoother and flatter, the welding point is firmer, and meanwhile, the welding point is not affected.
2. The embodiment of the utility model provides a welded riving knife for bonding, wherein a knife body and a knife head are formed by welding, and the knife body and the knife head are made of different materials, so that the whole riving knife has the flexibility and durability of the knife body to bear the force and impact of cutting, and the knife head has higher hardness and wear resistance to keep sharpness and resist abrasion; and the lead hole is arranged above the welding surface, so that the firmness of the whole welding surface of the chopper is not affected.
In general, according to the bonding welding chopper provided by the embodiment of the utility model, the first chamfer is arranged into the circular arc shape, the radius of the circular arc is limited, and smooth and flat transition between the working surface and the bonding wire is provided, so that the purposes that the welding strength is affected by the welding of the two ends of the first welding spot or the second welding spot or the welding spot damage caused by improper shape and size treatment of the two ends of the welding pad of the welding surface in the prior art can be avoided when the chopper is vibrated by ultrasonic waves.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a prior art bonding operation of a welded riving knife to a first bonding point;
FIG. 2 is a schematic diagram illustrating the operation of the bonding cleaver of the prior art in bonding a second bond point;
FIG. 3 is a schematic structural view of a bonding soldering chopper according to an embodiment of the present utility model;
FIG. 4 is a schematic diagram of a position of a middle bonding soldering cleaver in a bonding cleaver in accordance with another embodiment of the present utility model;
FIG. 5 is a schematic diagram of a welding position of a welding chopper for bonding according to an embodiment of the present utility model;
in the drawings, the reference numerals and corresponding part names:
1-tool bit, 2-tool body, 3-recess, 4-first step, 5-second step, 6-wire guide hole, 7-bond wire, 8-first chamfer, 9-second chamfer, 10-wire guide hole, 11-welding face, 12-first bonding point, 13-second bonding point.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present utility model, it should be noted that the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
Examples
As shown in fig. 1-2, in the prior art, the bonding tool bit 1 is used to press the bonding wire 7 or the bonding metal strip to be pressed on the metal welding disc, then the tool body 2 of the riving tool inputs ultrasonic pulses with the frequency of 20KHZ to 60KHZ and the amplitude of 5 μm to 80 μm in parallel to the direction of the bonding wire 7, so that the tool bit 1 generates horizontal elastic vibration and applies downward pressure. The chopper drives the lead to rapidly rub on the metal surface of the welding area under the action of the two forces, and the lead is subjected to plastic deformation under the action of energy and is in close contact with the bonding area in a short time to finish welding. However, the cutter head 1 in the prior art is square in shape and has obvious edges, and the cutter head 1 and the bonding wires 7 have no gentle and excessive structure, so that welding is unstable, and the welding points are easily damaged by the edges.
In the embodiment of the utility model, the welding chopper is improved, and the purpose is to improve the welding strength in the bonding process and avoid the falling of welding spots, so that the welding chopper for bonding is provided. The cutting head 1 needs to have a higher hardness and wear resistance to be sharp and resistant to wear. Thus, the tool bit 1 is often made of a harder material, such as tool steel, tungsten carbide alloy or ceramic. These materials can maintain the sharpness of the blade, extend the useful life, and provide better cutting performance when splitting. The blade 2 is generally required to have a certain flexibility and durability to withstand the force and impact of chopping. Thus, the blade body 2 is often made of a relatively resilient material, such as high carbon steel or tool steel, which can bend without breaking when impacted, while also having sufficient hardness to maintain the sharpness of the cutting edge.
In the embodiment of the utility model, as the cutter head 1 is preferably in an F shape, a C shape, a G shape and other structures, as shown in fig. 3, the two sides of the groove are respectively provided with a first step 4 and a second step 5, the bottom of the first step 4 is provided with a working surface, the second step 5 is provided with a wire guide hole 6, the wire guide hole 6 penetrates through the second step 5, the two ends of the wire guide hole 6 are free ends, bonding wires 7 penetrate through the wire guide hole 6, and the horizontal plane of the lower part of the wire guide hole 6 is higher than the horizontal plane of the working surface. In use, a wire of suitable length and diameter is prepared and the part to be welded is then placed on the cutter head 1 of the riving knife so that it is aligned with the recess. Ensuring the correct positioning of the components so that the bonding wire 7 is correctly soldered, if necessary, a certain amount of solder or wetting agent can be applied to the soldered location, which helps to improve the effect and quality of the soldering, inserting the bond wire 7 through the wire guide hole 6, from one side of the wire guide hole 6, through the wire guide hole 6 to the other side, forming a connection across the second step 5, and extending to the working surface, and then inputting the frequency by the blade 2 to effect the soldering.
Wherein the working surface comprises a circular arc-shaped first chamfer 8 and a second chamfer 9, the distance between the first chamfer 8 and the wire guiding hole 6 is larger than the distance between the second chamfer 9 and the wire guiding hole 6, and the radius of the first chamfer 8 is r 1 The bonding wire 7 has a diameter R, R 1 =r× (85% -115%), in particular R 1 Provides a smooth and gentle transition between the bonding plane and the bond wires 7, so r 1 The =bond wire 7 diameter or bond ribbon thickness, deviation is less than 15%. For example, for a bonding wire 7 with a diameter of 25um, the optimal choice is r 1 =25 um; under this parameter, the strength of the bonded wire 7 after bonding is highest.
Further, the radius of the second chamfer 9 is set to change with the change of the material, and may be called as critical radius because the radius of the second chamfer 9 has different roles in the first bonding point 12 and the second bonding point 13. If the choice is wrong, the bonding wire 7 of aluminium is liable to break and the bonding wire 7 of gold may not terminate correctly, so that the radius of the second chamfer 9 provides a smooth and flat transition between the bonding plane and the bonding wire 7 in the first bonding point 12 and the radius of the second chamfer 9 in the second bonding point 13 acts to press the bonding wire 7 apart.
In the embodiment of the present utility model, two kinds of radii of the second chamfer 9 are provided, one is that when the bonding wire 7 is a gold wire, the radius of the second chamfer 9 is r 2 ，r 2 =r× (35% -65%), preferably R 2 =50% x R; the other is that when the bonding wire 7 is silicon aluminum wire, the radius of the second chamfer 9 is r 3 ，r 3 =r× (85% -115%), preferably R 3 =r. Through the structure, the two ends of the welding spot of the welding chopper after bonding are in transition smooth, the bonding metal wire 7 cannot be crushed or damaged, the firmness and the roughness of the welding spot are ensured, and the wire breaking requirement of wedge welding bonding continuous production is met.
Further, as shown in fig. 4 and 5, the cutter body 2 is provided with a lead hole 10, the lead hole 10 longitudinally penetrates through the cutter body 2, and two ends of the lead hole 10 are free ends, and the cutter body 2 and the cutter head 1 made of different materials are provided in the embodiment of the utility model, so that the riving knife can achieve better balance in actual use, the flexibility of the cutter body 2 can slow down impact and prevent breakage, and meanwhile, the hardness and the wear resistance of the cutter head 1 can provide better cutting capability and service life, and the design can enable the riving knife to be more reliable and effective in a chopping task. That is, the blade body 2 and the cutter head 1 are connected by welding, the materials of the blade body 2 and the cutter head 1 are different, a welding surface 11 is formed by welding, and the free end of the bottom of the lead hole 10 is arranged above the welding surface 11. Specifically, if the cutter body 2 and the cutter head 1 are welded to form a cutter body, if the lead hole 10 extends to the cutter head 1 as shown in fig. 4, that is, passes through the welding point, at this time, since the material ratio of the cutter body 2 and the cutter head 1 is different, the drill bit is damaged and the efficiency is affected by performing one-time drilling on two different materials, so in the embodiment of the utility model, the lead hole 10 needs to be staggered from the welding surface 11, and the drill bit is prevented from being damaged and the efficiency is prevented from being affected. In this structure, the welded surface 11 may be located at the lower side of the lead hole 10, or at the left side of the lead hole 10, so long as it is not in contact with the lead hole 10, and may be set according to practical requirements and the shape of the blade 2.
Further, as a preferred embodiment of the present utility model, the blade body 2 is made of tungsten carbide alloy material, the tool bit 1 is made of titanium carbide alloy or titanium nitride cermet material, and silver-copper solder is used as the welding agent. Specifically, the tungsten carbide alloy as the blade 2 and the titanium carbide alloy or titanium nitride cermet as the bit 1 are firmly connected together, typically with silver-copper solder, to form the whole riving knife.
In another embodiment of the present utility model, the blade 2 and the tool bit 1 are integrally formed, and the blade 2 and the tool bit 1 are made of the same material, at this time, the wire hole 10 may extend longitudinally through the tool bit 1, and the free end of the bottom of the wire hole 10 is higher than the free end of the top of the wire hole 6, and in other embodiments, the wire hole 10 may be disposed above the tool bit 1 and not extend to the tool bit 1, so long as the wire 7 can be positioned, fixed and protected.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model. It should be noted that the structures or components illustrated in the drawings are not necessarily drawn to scale, and that descriptions of well-known components and processing techniques and procedures are omitted so as not to unnecessarily limit the present utility model.
Claims (10)
1. The utility model provides a welding chopper for bonding, includes the chopper body, its characterized in that, the chopper body includes tool bit (1) and blade (2) on upper portion, tool bit (1) bottom is provided with recess (3), the both sides of recess (3) are provided with first step (4) and second step (5) respectively, first step (4) bottom is provided with the working face, be provided with wire guide hole (6) on second step (5), wire guide hole (6) run through second step (5), there is bonding wire (7) or bonding metal tape to pass in wire guide hole (6), the horizontal plane of wire guide hole (6) lower part is higher than the horizontal plane that the working face is located;
wherein the working surface comprises a circular arc-shaped first chamfer (8) and a second chamfer (9), the distance between the first chamfer (8) and the wire guiding hole (6) is larger than the distance between the second chamfer (9) and the wire guiding hole (6), and the radius of the circle where the first chamfer (8) is positioned is r 1 The diameter of the bonding wire (7) is R, the R 1 ＝R×(85％-115％)。
2. The bonding soldering riving knife according to claim 1, wherein r 1 ＝R。
3. A bonding soldering riving knife according to claim 1, characterized in that the blade (2) is provided with a lead hole (10), the lead hole (10) extending longitudinally through the blade (2).
4. A welded chopper for bonding according to claim 3, characterized in that the blade body (2) and the cutter head (1) are integrally formed, and the blade body (2) and the cutter head (1) are made of the same material.
5. A bonding solder cleaver according to claim 4, characterised in that the lead hole (10) extends longitudinally through the tool bit (1), the bottom of the lead hole (10) being higher than the top of the lead hole (6).
6. A welded riving knife for bonding according to claim 3, characterized in that the blade (2) is connected with the blade (1) by means of welding, the blade (2) and the blade (1) being of different materials.
7. A bonding solder cleaver according to claim 6, characterised in that the solder forms a solder face (11) and the bottom of the wire aperture (10) is above the solder face (11).
8. A welding chopper for bonding according to any of claims 1-7, characterized in that the bonding wire (7) is gold wire and the radius of the circle where the second chamfer (9) is located is r 2 The r is 2 ＝R×(35％-65％)。
9. A welding chopper for bonding according to any of claims 1-7, characterized in that the bonding wire (7) is a silicon aluminum wire, and the radius of the circle where the second chamfer (9) is located is r 3 The r is 3 ＝R×(85％-115％)。
10. A bonding soldering riving knife according to claim 6 or 7, characterized in that the blade body (2) is made of tungsten carbide alloy material, the blade head (1) is made of titanium carbide alloy or titanium nitride cermet material, and the soldering agent for soldering is silver-copper solder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322229302.3U CN220612629U (en) | 2023-08-18 | 2023-08-18 | Welding chopper for bonding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322229302.3U CN220612629U (en) | 2023-08-18 | 2023-08-18 | Welding chopper for bonding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220612629U true CN220612629U (en) | 2024-03-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322229302.3U Active CN220612629U (en) | 2023-08-18 | 2023-08-18 | Welding chopper for bonding |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220612629U (en) |
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2023
- 2023-08-18 CN CN202322229302.3U patent/CN220612629U/en active Active
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