阅读说明：本技术 一种焊接一体键合劈刀 (Welding integrated bonding chopper ) 是由 杨海涛 于 2019-10-10 设计创作，主要内容包括：本发明提供的一种焊接一体键合劈刀,包括劈刀主体,所述劈刀主体内部开设有引线腔,所述引线腔由上至下形成锥形,所述引线腔的上端缠绕第一电热丝,在所述引线腔的下端缠绕有第二电热丝,所述劈刀主体的中间连接臂部分开设有伸缩腔室,所述伸缩腔室内分别设置有劈刀嘴的连接臂,和劈刀嘴的连接臂固定连接的簧片,以及和簧片末端连接的压力传感器,所述劈刀嘴末端开设有焊线槽,所述焊线槽外端面设置有刀头。本发明在键合引线过程中,使第一键合点和第二键合点完全键合,且在第二键合点键合时施加较大的压力,使引线完全断开,以完成下一组键合工作,避免引线粘连。(The invention provides a welded integrated bonded chopper which comprises a chopper main body, wherein a lead cavity is formed in the chopper main body, the lead cavity is tapered from top to bottom, a first electric heating wire is wound at the upper end of the lead cavity, a second electric heating wire is wound at the lower end of the lead cavity, a telescopic cavity is formed in the middle connecting arm part of the chopper main body, a connecting arm of a chopper mouth, a reed fixedly connected with the connecting arm of the chopper mouth and a pressure sensor connected with the tail end of the reed are respectively arranged in the telescopic cavity, a welding wire groove is formed in the tail end of the chopper mouth, and a cutter head is arranged on the outer end face of the welding wire groove. In the process of bonding the lead, the first bonding point and the second bonding point are completely bonded, and a larger pressure is applied during bonding of the second bonding point, so that the lead is completely disconnected, the next group of bonding work is completed, and the lead adhesion is avoided.)

1. A welded integral bond riving knife comprising: the cleaver main body (1) is characterized in that a lead wire cavity (2) is formed in the cleaver main body (1), the lead wire cavity (2) forms a cone shape from top to bottom, a lead wire (3) penetrates through the lead wire cavity (2), a first electric heating wire (4) is wound at the upper end of the lead wire cavity (2), a second electric heating wire (5) is wound at the lower end of the lead wire cavity (2), a telescopic cavity (101) is formed in the middle connecting arm part of the cleaver main body (1), a connecting arm of a cleaver nozzle (6) and a reed (7) fixedly connected with the connecting arm of the cleaver nozzle (6) are respectively arranged in the telescopic cavity (101), and a pressure sensor (8) connected with the tail end of the reed (7), a welding wire groove (601) is formed in the tail end of the cleaver nozzle (6), a tool bit (602) is arranged on the outer end face of the welding wire groove (601), and the pressure sensor (8, an anti-oxidation protection device (9) is installed on the inner side of the riving knife mouth (6), and a temperature sensor (10) is arranged on the outer wall of the tail end of the riving knife mouth (6) where the lead wire cavity (2) is arranged.

2. The welding integrated bonding riving knife of claim 1, wherein the first heating wire (4) and the second heating wire (5) are respectively and uniformly wound on the outer wall of the lead wire cavity (2), and the first heating wire (4) and the second heating wire (5) are connected in series, and the winding density of the second heating wire (5) is twice that of the first heating wire (4).

3. The welded one-piece bonded chopper of claim 1, wherein the pressure sensor (8), the temperature sensor (10) and the controller are electrically connected, and the first heating wire (4) and the second heating wire (5) are electrically connected with the power module.

4. The bonded integrated bond chopper of claim 1, wherein the pressure feedback threshold of the pressure sensor (8) is N1 when the tool tip (602) contacts the first bond point and the pressure feedback threshold of the pressure sensor (8) is N2 and 3/2N 1N 2N1 when the tool tip (602) contacts the second bond point during wire bonding.

5. The bonded integral chopper of claim 4, wherein the connecting arm of the chopper nozzle (6) is configured to expand and contract in the expansion chamber (101) by the same amount as the diameter of the wire filament (8) during wire bonding.

6. The welding integrated bonding riving knife of claim 1, wherein the anti-oxidation protection device (9) protects the copper ball from oxidation by the mixed reducing gas of hydrogen and nitrogen in the ball burning process and the bonding process, wherein the gas ratio is as follows: 95% N2, 5% H2.

7. The bonded integral key cleaver of claim 1, wherein the wire cavity (2) has a distal end diameter that is substantially the same as the diameter of the wire (3).

8. The welded one-piece bonded cleaver of claim 1, wherein the cross-sectional shape of the tool tip (602) is a circular arc.

9. The welded one-piece bonded chopper of claim 1, wherein the chopper body (1) is made of ceramic.

Technical Field

The invention belongs to the field of lead bonding devices, and particularly relates to a welding integrated bonding chopper.

Background

In the production and packaging of semiconductor devices, wire bonding has been the primary method of providing electrical interconnection between two locations within a package. The cleaver is an important tool in the wire bonding process, and the structure and the performance of the cleaver determine the flexibility, the reliability and the economical efficiency of bonding.

However, the existing bonding cleaver has consistent pressure on the first bonding point and the second bonding point, and the problems of insufficient wire bonding strength, wire adhesion and the like often occur due to insufficient temperature of the cutter mouth part.

Therefore, in the wire bonding process, it is necessary to develop a cleaver capable of improving the wire bonding strength and reducing the bonding failure rate.

Disclosure of Invention

In order to solve the problems, the invention provides a welding integrated bonding chopper, which enables a first bonding point and a second bonding point to be completely bonded by setting the pressure of the first bonding point and the pressure of the second bonding point to be inconsistent, and applies larger pressure when the second bonding point is bonded so as to completely break a lead to complete the next group of bonding work, thereby avoiding lead adhesion, enabling the lead to form full ball-and-star bonding by controlling the temperature of a cutter nozzle, and having higher bonding strength.

The invention provides a welded integrated bonding chopper which comprises a chopper main body, wherein a lead cavity is formed in the chopper main body, the lead cavity is tapered from top to bottom, a lead wire penetrates through the lead wire cavity, a first heating wire is wound at the upper end of the lead wire cavity, a second heating wire is wound at the lower end of the lead wire cavity, a telescopic cavity is arranged on the middle connecting arm part of the riving knife main body, the connecting arm of the riving knife mouth and the reed fixedly connected with the connecting arm of the riving knife mouth are respectively arranged in the telescopic cavity, and a pressure sensor connected with the tail end of the reed, wherein the tail end of the chopper mouth is provided with a welding wire groove, the outer end surface of the welding wire groove is provided with a cutter head, the pressure sensor is fixed on the inner wall of the telescopic cavity, the inner side of the cleaver nozzle is provided with an anti-oxidation protection device, the tail end of the cleaver mouth is provided with the tail end outer wall of the lead cavity is provided with a temperature sensor.

Preferably, the first heating wire and the second heating wire are respectively and uniformly wound on the outer wall of the lead wire cavity, the first heating wire and the second heating wire are connected in series, and the winding density of the second heating wire is twice that of the first heating wire.

Preferably, the pressure sensor, the temperature sensor and the controller are electrically connected, and the first heating wire and the second heating wire are electrically connected with the power module.

Preferably, during wire bonding, the pressure feedback threshold of the pressure sensor is N1 when the tool bit contacts the first bonding point, and the pressure feedback threshold of the pressure sensor is N2 when the tool bit (602) contacts the second bonding point, and 3/2N 1N 2N 1.

Preferably, in the process of bonding the lead, the expansion amount of the connecting arm of the cleaver nozzle in the expansion chamber is consistent with the diameter of the lead wire.

Preferably, the anti-oxidation protection device protects the copper balls from being oxidized by mixed reducing gas of hydrogen and nitrogen in the ball burning process and the bonding process, wherein the gas ratio is as follows: 95% N2, 5% H2.

Preferably, the end caliber of the lead wire cavity is consistent with the caliber of the lead wire.

Preferably, the cross-sectional shape of the cutter head is circular arc.

Preferably, the body of the riving knife is made of ceramic materials.

The invention has the beneficial effects that:

1. according to the welded integrated bonding chopper, the lead cavity is conical from top to bottom, the first electric heating wire is wound at the upper end of the lead cavity, the second electric heating wire is wound at the lower end of the lead cavity, the heating temperature is controlled and adjusted through the temperature sensor and the controller, so that the temperature in the lead cavity is gradually increased from top to bottom, the lead is completely sintered into a ball from the tail end of the cutter nozzle, the phenomenon that the cutter nozzle is blocked due to bottom sintering impermeability caused by traditional top heating or electric spark heating is avoided, and the ball is stably and continuously discharged from the cutter nozzle.

2. According to the invention, the middle connecting arm part of the cleaver main body is provided with the telescopic chamber, the connecting arm of the cleaver nozzle, the reed fixedly connected with the connecting arm of the cleaver nozzle and the pressure sensor connected with the tail end of the reed are respectively arranged in the telescopic chamber, in the process of bonding the lead, the first bonding point and the second bonding point are completely bonded, and a larger pressure is applied when the second bonding point is bonded, so that the lead is completely disconnected, the next group of bonding work is completed, and the lead adhesion is avoided.

3. According to the invention, the anti-oxidation protection device is arranged on the inner side of the riving knife nozzle, so that the phenomenon that the riving knife nozzle is oxidized after being used for a long time is avoided, and the ball cannot be smoothly spitted.

Drawings

The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.

FIG. 1 is a cross-sectional view of a welded integral bonded riving knife of the present invention;

FIG. 2 is an enlarged view of a portion of the device shown in FIG. 1;

FIG. 3 is an enlarged view of a portion of the device shown in FIG. 1.

Detailed Description

To further illustrate the technical means and effects of the present invention, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.