Wedge welding chopper

Abstract

The wedge bonding chopper is applied to the field of chip welding and comprises a chopper body, a welding end is arranged at one end of the chopper body, two receding grooves are formed in the outer edge of the welding end, the welding end is located between the two receding grooves, a welding inclined face and a working face are arranged at the end, away from the chopper body, of the welding end, and the working face is located between the welding inclined face and the working face. A first through groove is formed in the welding inclined face, a second through groove is formed in the working face, the two ends of the second through groove are communicated with the two receding grooves respectively, a first threading hole is formed in the cutter body, and a second threading hole is formed in the groove bottom of the first through groove. The welding structure has the technical effects that the two avoiding grooves are formed in the welding end, so that the use space occupied by the welding end is reduced, the possibility of interference between the outer edge of the welding end and the near wall of the deep cavity is reduced, the deep cavity welding conditions of ultra-narrow spacing and ultra-high near wall can be conveniently dealt with, the use limitation is small, and the welding efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of chip bonding technology, and in particular to a wedge bonding cutter. Background Technology

[0002] Wedge bonding wrenches are ultrasonic bonding tools used for metal wires such as aluminum wire, aluminum strip, gold wire, gold strip, copper wire, and copper strip, and are particularly suitable for wedge bonding processes. In wedge bonding, the wedge bonding wrenches guide, position, and clamp the metal wires.

[0003] Publication No. CN212967605U discloses a wedge welding cutter, including a welding end at the bottom and a columnar rod body. The welding end has a notch on its end face along the length of the rod body. The notch forms a side wall at the bottom end of the rod body that is approximately parallel to the axial direction of the rod body. The bottom surface of the welding end has a working surface. The rod body has a first wire-passing hole that extends axially from the top of the rod body to the notch, and a second wire-passing hole that extends obliquely from the side wall to the working surface. The side wall has an arc-shaped groove that extends axially along the rod body and connects the first wire-passing hole and the second wire-passing hole.

[0004] During use, the small gap between the outer circle of the welding end and the shaft of the aforementioned wedge welding cutter results in a large operating space occupied by the welding end, making it difficult to handle deep cavity welding situations with ultra-fine spacing and ultra-high near-wall thickness. The outer edge of the welding end is prone to interference with the near-wall thickness of the deep cavity, which greatly limits its use and leads to low welding efficiency. Summary of the Invention

[0005] To address the problems in related technologies where the small distance between the outer circle of the welding end and the shaft of a wedge welding cutter results in a large operating space occupied by the welding end, making it difficult to handle deep cavity welding with ultra-fine spacing and ultra-high near-wall thickness, and causing interference between the outer edge of the welding end and the near-wall thickness of the deep cavity, thus limiting its use and leading to low welding efficiency, this application provides a wedge welding cutter with the following technical solution: It includes a cutter body, one end of which is provided with a welding end. Two clearance grooves are formed on the outer edge of the welding end, and the welding end is located between the two clearance grooves. The end of the welding end facing away from the cutter body is provided with a welding slope and a working surface. A first through groove is formed on the welding slope, and a second through groove is formed on the working surface. The two ends of the second through groove are respectively connected to the two clearance grooves. A first threading hole is formed on the cutter body, and a second threading hole is formed at the bottom of the first through groove.

[0006] In one specific implementation scheme, a horn groove is provided at the end of the second threading hole that is away from the first through groove, and the open end of the horn groove is set towards the first threading hole.

[0007] In one specific implementation, the welding end is provided with a clearance slope, and the first through groove is located between the clearance slope and the second through groove.

[0008] In one specific implementation, the inclination angle of the avoidance ramp ranges from 35° to 55°.

[0009] In one specific implementation, the blade body is provided with a first inclined surface, and the inclination angle of the first inclined surface is in the range of 2 to 5°.

[0010] In one specific implementation, the outer edge of the blade body is provided with a second inclined surface, the first threading hole passes through the second inclined surface, and the inclination angle of the second inclined surface is in the range of 2 to 5°.

[0011] In one specific implementation, the blade body has two third inclined surfaces facing each other, and the angle between the two third inclined surfaces is in the range of 10 to 15°.

[0012] In one specific implementation, the welding end facing away from the tool body has a rounded chamfer.

[0013] In one specific implementation, an arc-shaped guide surface is provided between the first through slot and the second through slot.

[0014] In one specific implementation, the second through groove is arc-shaped.

[0015] In summary, this application has the following beneficial technical effects: after the metal wire passes through the first wire hole, the second wire hole, and the first through groove in sequence, it is welded on the working surface of the welding end. By opening two clearance grooves on the welding end, the usable space occupied by the welding end is reduced, the possibility of interference between the outer edge of the welding end and the near wall of the deep cavity is reduced, it is easier to deal with the welding of deep cavities with ultra-narrow spacing and ultra-high near walls, the application has few limitations, and the welding efficiency is improved. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0017] Figure 2 This is a structural schematic diagram used to illustrate the third inclined plane in the embodiments of this application.

[0018] Figure 3 yes Figure 1 Enlarged diagram of point A in the middle.

[0019] Reference numerals in the attached drawings: 1. Tool body; 2. Welding end; 3. Clearance groove; 4. Welding bevel; 5. Working surface; 6. First through groove; 7. Second through groove; 8. First wire hole; 9. Second wire hole; 10. Horn groove; 11. Clearance bevel; 12. First bevel; 13. Second bevel; 14. Third bevel; 15. Rounded chamfer; 16. Rounded guide surface. Detailed Implementation

[0020] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0021] This application discloses a wedge welding cutter.

[0022] Reference Figure 1 , Figure 2 and Figure 3 The wedge welding cutter includes a blade body 1, with a welding end 2 fixedly connected to one end of the blade body 1. Two clearance grooves 3 are opened on the outer edge of the welding end 2, and the welding end 2 is located between the two clearance grooves 3. The welding end 2 serves as the blade tip. By opening the two clearance grooves 3, the blade tip is thinned on both sides, thereby reducing the overall usable space occupied by the welding end 2.

[0023] Reference Figure 1 , Figure 2 and Figure 3 The welding end 2, away from the cutter body 1, is provided with a welding bevel 4 and a working surface 5. The welding bevel 4 is connected to the working surface 5. A first through groove 6 is provided on the welding bevel 4. In this embodiment, the cross-section of the first through groove 6 is square. A second through groove 7 is provided on the working surface 5. The two ends of the second through groove 7 are respectively connected to two clearance grooves 3. In this embodiment, the shape of the second through groove 7 matches the design of the metal wire as an arc, and the arc-shaped second through groove 7 reduces the possibility of the sharp edge of the groove bottom damaging the metal wire. An arc-shaped guide surface 16 is provided between the first through groove 6 and the second through groove 7. The arc-shaped guide surface 16 plays a role in the arc transition, reducing stress concentration and guiding the direction of the metal wire.

[0024] Reference Figure 1 , Figure 2 and Figure 3 The blade body 1 has a first threading hole 8, and the bottom of the first through groove 6 has a second threading hole 9. The diameter of the first threading hole 8 is in the range of 0.1 to 0.3 mm. In this embodiment, the diameter of the first threading hole 8 is set to 0.2 mm. The first threading hole 8 facilitates the threading of metal wire, which greatly enhances the ability of the wedge welding cutter to penetrate into deep and narrow welding grooves and enhances the deep cavity welding function of the wedge welding cutter.

[0025] Reference Figure 1 and Figure 2The outer edge of the blade body 1 is provided with a first inclined surface 12. The inclination angle of the first inclined surface 12 is in the range of 2 to 5°. In this embodiment, the inclination angle of the first inclined surface 12 is set to 2°. By setting the angle of the first inclined surface 12, this embodiment optimizes the back of the wedge bonding cutter from the traditional 10° to an almost vertical 2°. 2° is the limit angle that can be reached near the wall of the deep cavity. In this way, at the same distance from the side wall of the deep cavity, the deepest penetration depth of the wedge bonding cutter can reach 3.8mm, which facilitates the bonding of metal wires to the pads of the chip inside the deep cavity.

[0026] Reference Figure 1 and Figure 2 The outer edge of the blade body 1 is provided with a second inclined surface 13, and the first wire hole 8 passes through the second inclined surface 13. The inclination angle of the second inclined surface 13 is in the range of 2 to 5°. In this embodiment, the inclination angle of the second inclined surface 13 is set to 2°, so that when the distance to the side wall is only 0.5mm, the deepest penetration depth of the wedge welding cutter can reach 6.8mm, which solves the problem that the wedge welding cutter is difficult to cut when it is close to the side wall.

[0027] Reference Figure 1 and Figure 2 The blade body 1 has two opposite third inclined surfaces 14, and the angle between the two third inclined surfaces 14 is in the range of 10 to 15°. In this embodiment, the angle between the two third inclined surfaces 14 is 12°. The outer edge of the blade body 1 is thinned on both sides by the two third inclined surfaces 14, and the main angle of the wedge welding cutter is reduced from 20° to 12°. In ultra-fine pitch welding, the third inclined surfaces 14 solve the problem of interference between the wedge welding cutter and the external sidewall. In practical applications, with a gold wire diameter of 25 μm, it is possible to achieve ultra-fine pitch welding with a center point distance of only 53 μm between the two gold wires and a gap between the gold wires of less than 10 μm.

[0028] Reference Figure 1 and Figure 3 The second wire-passing hole 9 has a horn groove 10 at the end opposite to the first through groove 6. The open end of the horn groove 10 faces the first wire-passing hole 8. The horn groove 10 guides the metal wire, facilitating its smooth movement into the second wire-passing hole 9. The welding end 2 has a rounded chamfer 15 at the end opposite to the blade body 1. The rounded chamfer 15 avoids the chip, reducing the possibility of the sharp edge of the welding end 2 damaging the chip. The welding end 2 has a relief slope 11. The first through groove 6 is located between the relief slope 11 and the second through groove 7. The inclination angle of the relief slope 11 ranges from 35° to 55°. In this embodiment, the angle of the relief slope 11 is 45°, reducing the possibility of the welding end 2 colliding with nearby chips when welding ultra-fine pitch arcs.

[0029] Furthermore, since this embodiment addresses extremely deep cavities and very close-to-wall conditions, the metal wire can only be threaded vertically. Therefore, the entire blade body 1 has a main hole structure with a first threading hole 8. The metal wire is then threaded through the first threading hole 8 to the horn groove 10, and then through the horn groove 10 and the second threading hole 9 (30µm) to feed the gold wire onto the working surface 5 of the welding end 2. This application can be used as a wedge welding cutter for fully automatic welding, or as a deep cavity wedge welding cutter for manual threading welding. In this embodiment, gold wire is used as an example for welding. To meet the requirements of high-frequency automation, the length of the wedge welding cutter in this embodiment can be set to 1 inch (25.4mm) or 1.3 inches (33.02mm). The length of the semi-automatic and manual threading wedge welding cutter can be set to 0.75 inches (19.05mm).

[0030] The implementation principle of this application embodiment is as follows: the metal wire is sequentially passed through the first wire hole 8, the speaker groove 10, the second wire hole 9, and the first through groove 6, and then welded on the working surface 5 of the welding end 2. By opening two clearance grooves 3 on the welding end 2, the space occupied by the welding end 2 is reduced, the possibility of interference between the outer edge of the welding end 2 and the near wall of the deep cavity is reduced, which is convenient for dealing with the welding of deep cavities with ultra-narrow pitch and ultra-high near wall. It has few limitations in use and realizes welding between two ultra-fine pitch chips. It can go deep into the deep cavity to perform gold wire bonding on the chip pads, reduce the possibility of gold wire overlap, and improve welding efficiency.

[0031] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A wedge welding cutter, characterized in that: The tool includes a blade body (1), one end of which is provided with a welding end (2). Two clearance grooves (3) are opened on the outer edge of the welding end (2). The welding end (2) is located between the two clearance grooves (3). The end of the welding end (2) away from the blade body (1) is provided with a welding inclined surface (4) and a working surface (5). A first through groove (6) is opened on the welding inclined surface (4). A second through groove (7) is opened on the working surface (5). The two ends of the second through groove (7) are respectively connected to the two clearance grooves (3). A first wire hole (8) is opened on the blade body (1). A second wire hole (9) is opened at the bottom of the first through groove (6).

2. The wedge welding cutter according to claim 1, characterized in that: The second wire hole (9) has a horn groove (10) at one end away from the first through groove (6), and the open end of the horn groove (10) is set towards the first wire hole (8).

3. The wedge welding cutter according to claim 1, characterized in that: The welding end (2) is provided with a relief slope (11), and the first through groove (6) is located between the relief slope (11) and the second through groove (7).

4. The wedge welding cutter according to claim 3, characterized in that: The inclination angle of the avoidance ramp (11) ranges from 35° to 55°.

5. The wedge welding cutter according to claim 1, characterized in that: The blade (1) is provided with a first inclined surface (12), and the inclination angle of the first inclined surface (12) is in the range of 2 to 5°.

6. The wedge welding cutter according to claim 1, characterized in that: The outer edge of the blade body (1) is provided with a second inclined surface (13), and the first thread hole (8) passes through the second inclined surface (13). The inclination angle of the second inclined surface (13) is in the range of 2 to 5°.

7. The wedge welding cutter according to claim 1, characterized in that: The blade body (1) has two opposite third inclined surfaces (14), and the angle between the two third inclined surfaces (14) is 10 to 15°.

8. The wedge welding cutter according to claim 1, characterized in that: The welding end (2) is provided with a rounded chamfer (15) at the end away from the cutter body (1).

9. The wedge welding cutter according to claim 1, characterized in that: An arc-shaped guide surface (16) is provided between the first through groove (6) and the second through groove (7).

10. The wedge welding cutter according to claim 1, characterized in that: The second through groove (7) is arc-shaped.

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