Lubricating liquid-gas mixing structure for wire drawing of bonded aluminum wire

Abstract

The utility model discloses a lubricant liquid-gas mixing structure for bonding aluminum wire drawing, which comprises a sealed pressure stirring barrel, a stirrer, a liquid nitrogen injection pipeline, a pressure bin and a pressure release valve, the sealed pressure stirring barrel is connected with the pressure bin through a pipeline, the pressure bin is connected with a wire drawing mechanism through a pipeline, the stirrer is arranged in the sealed pressure stirring barrel, and the liquid nitrogen injection pipeline is connected with the pressure bin through a pipeline. The liquid nitrogen injection pipeline is connected with the sealed pressure stirring barrel, and the pressure release valve is arranged on the pressure bin. The bonding wire drawing device has the beneficial effects that by arranging the sealed pressure stirring barrel and the pressure bin, nitrogen enters lubricating liquid again, so that the pressurized lubricating liquid can realize better coating property on the surface of a wire rod in the wire drawing process of the bonding wire; the lubricating oil with nitrogen can form a good air cushion in an extrusion area and a sizing area of the die, friction between the wire rod and the die is reduced, friction force is reduced, meanwhile, the lubricating oil is prevented from being heated and denatured during wire drawing due to too high viscosity, and dirt contamination on the surface of the wire rod is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of bonding wire drawing, in particular to a liquid-gas mixing structure of lubricating fluid for bonding aluminum wire drawing. Background Art

[0002] Bonding aluminum wire is a core material for semiconductor packaging, a part that connects pins and chips and conveys electrical signals, and is an indispensable core material in semiconductor production. Commonly used bonding aluminum wires are divided into two categories according to their wire diameter ranges: fine aluminum wires (125um - 500um) and ultra-fine aluminum wires (18um - 125um).

[0003] Generally, in the process of bonding wire drawing, a diamond die is used to thread the metal wire through from one side and out from the other side; and common non-slip devices adopt multi-pass stretching. Through the multi-pass stretching process, the cross-sectional area of the material can be gradually reduced, the ductility of the material can be increased, and the continuous preparation of fine wires can be achieved.

[0004] In general, oil-based lubricating fluids are used for bonding aluminum wire drawing. During lubrication, in order to ensure sufficient lubrication, an oil pump is usually used to spray the lubricating oil onto the wire surface through an oil nozzle. Generally, in order to improve the fluidity of the oil, the oil needs to be heated. However, it is necessary to cool the oil to room temperature before stretching can be carried out. In the process of bonding aluminum wire drawing, due to the extremely fine wire diameter of the product (tiny die holes and short lubrication zones), the infiltration performance and anti-extrusion ability of conventional lubricating fluids are insufficient, and conventional lubricating fluids often cannot achieve continuous and uniform coating; during the high-speed stretching process, friction occurs between the material surface and the die, which easily leads to adhesion between the material and the die, thus affecting the stretching effect. And due to long-term friction, the material will undergo plastic deformation, resulting in a local temperature rise. Excessive temperature will cause the grains of the material to grow, affecting the performance of the material. In addition, there are risks in oil-based lubricants. During the stretching process, local temperature rise due to friction may be too high, resulting in denaturation, and there is a risk of dirt adhesion on the wire surface, and even a risk of blocking the die and breaking the wire due to excessive accumulation of contamination. The residue of organic pollutants poses a risk of affecting the bonding strength during bonding. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a liquid-gas mixing structure of lubricating fluid for bonding aluminum wire drawing to solve the problems raised in the above background art.

[0006] To achieve the above object, the present utility model provides the following technical solution: A liquid-gas mixing structure for lubricating liquid in bonding aluminum wire drawing, including a sealed pressure stirring barrel, a stirrer, a liquid nitrogen injection pipeline, a pressure chamber and a pressure relief valve. The sealed pressure stirring barrel is connected to the pressure chamber through a pipeline. The pressure chamber is connected to a wire drawing mechanism through a pipeline. The stirrer is arranged inside the sealed pressure stirring barrel. The liquid nitrogen injection pipeline is connected to the sealed pressure stirring barrel. The pressure relief valve is arranged on the pressure chamber.

[0007] Preferably, it further includes a first vacuum pump and a second vacuum pump. The first water pump is arranged on the pipeline between the sealed pressure stirring barrel and the pressure chamber. The second water pump is arranged on the pipeline between the pressure chamber and the wire drawing mechanism.

[0008] Preferably, the pressure value of the sealed pressure stirring barrel is 6 MPa.

[0009] Preferably, the pressure value of the pressure chamber is 0.2 MPa.

[0010] Preferably, the wire drawing mechanism includes a sealing sleeve. Axially distributed first and second wire drawing dies are arranged inside the sealing sleeve. The wire moves from the first wire drawing die to the second wire drawing die. The sealing sleeve is provided with a liquid inlet pipe and a liquid outlet pipe. The liquid inlet pipe is connected to the pressure chamber.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows: By setting the sealed pressure stirring barrel and the pressure chamber, nitrogen is reintroduced into the lubricating liquid, enabling the pressurized lubricating liquid to achieve better coating property on the surface of the wire during the bonding wire drawing process. The lubricating oil with nitrogen can form a good air cushion in the die extrusion area and the sizing area, reducing the friction between the wire and the die. While reducing the frictional force, it avoids the thermal denaturation of the lubricating oil with too high viscosity during wire drawing and reduces the dirt contamination on the wire surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic structural diagram of the present utility model;

[0013] Figure 2 It is a schematic structural diagram of the wire drawing mechanism of the present utility model.

[0014] In the figure: 1, sealed pressure stirring barrel; 2, stirrer; 3, liquid nitrogen injection pipeline; 4, pressure chamber; 5, pressure relief valve; 6, first vacuum pump; 7, second vacuum pump; 8, wire drawing mechanism; 81, sealing sleeve; 82, first wire drawing die; 83, second wire drawing die; 84, liquid inlet pipe; 85, liquid outlet pipe; 86, oil receiving tray. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.

[0016] Please refer to Figure 1 , the present utility model provides a technical solution: a liquid-gas mixing structure for lubricating liquid in bonding aluminum wire drawing, including a sealed pressure stirring barrel 1, a stirrer 2, a liquid nitrogen injection pipe 3, a pressure chamber 4 and a pressure relief valve 5. The sealed pressure stirring barrel 1 is connected to the pressure chamber 4 through a pipe. The pressure value of the sealed pressure stirring barrel is 6 MPa, and the pressure value of the pressure chamber is 0.2 MPa. A first vacuum pump 6 is also provided on the pipe between the sealed pressure stirring barrel 1 and the pressure chamber 4. The pressure chamber 4 is connected to a wire drawing mechanism 8 through a pipe, that is, inside a sheathing film. A second vacuum pump 7 is provided on the pipe between the pressure chamber 4 and the wire drawing mechanism. The stirrer 2 is arranged inside the sealed pressure stirring barrel 1. The liquid nitrogen injection pipe 3 is connected to the sealed pressure stirring barrel 1, and the other end of the liquid nitrogen injection pipe 3 is connected to a liquid nitrogen storage tank. The pressure relief valve 5 is arranged on the pressure chamber 4. The wire drawing mechanism 8 includes a sealing sleeve 81. Axially distributed first wire drawing dies 82 and second wire drawing dies 83 are arranged inside the sealing sleeve 81. The wire 9 moves from the first wire drawing die to the second wire drawing die. The sealing sleeve 81 is provided with a liquid inlet pipe 84 and a liquid outlet pipe 85. The liquid inlet pipe 84 is connected to the pressure chamber 4. An oil receiving tray 86 is arranged at the bottom end of the sealing sleeve 81 for receiving and placing the overflowing lubricating liquid.

[0017] Add the lubricating liquid 8 into the sealed pressure stirring barrel 1, uniformly add liquid nitrogen from above through the liquid nitrogen storage tank, and then pump the stirred lubricating liquid 8 into the pressure chamber 4 through the first vacuum pump. Release the excess nitrogen through the pressure relief valve 5, and directly pump the lubricating liquid 8 filled with nitrogen into the wire drawing mechanism 8 through the second vacuum pump. Under the action of pressure, the lubricating liquid 8 flows from the liquid inlet pipe 84 and is actually coated on the surface of the wire 9; the lubricating oil 8 with nitrogen can form a good air cushion in the die extrusion area and the sizing area, reduce the friction between the wire and the die, while reducing the frictional force, avoid the lubricating oil from being thermally denatured when the viscosity is too high during wire drawing, and reduce the dirt contamination on the wire surface.

[0018] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A lubricating liquid-gas mixing structure for aluminum wire bonding drawing, characterized in that: The invention comprises a sealed pressure stirring barrel, an agitator, a liquid nitrogen injection pipeline, a pressure chamber and a pressure relief valve. The sealed pressure stirring barrel is connected to the pressure chamber through a pipeline, the pressure chamber is connected to a wire drawing mechanism through a pipeline, the agitator is arranged in the sealed pressure stirring barrel, the liquid nitrogen injection pipeline is connected to the sealed pressure stirring barrel, and the pressure relief valve is arranged on the pressure chamber.

2. The lubricating liquid-gas mixing structure for aluminum wire bonding drawing according to claim 1, characterized in that: It also includes a first vacuum pump and a second vacuum pump. The first vacuum pump is arranged in a pipeline between the sealed pressure stirring barrel and the pressure chamber, and the second vacuum pump is arranged in a pipeline between the pressure chamber and the wire drawing mechanism.

3. The lubricating liquid-gas mixing structure for aluminum wire bonding drawing according to claim 1, characterized in that: The pressure value of the sealed pressure stirring barrel is 6MPa.

4. The lubricating liquid-gas mixing structure for aluminum wire bonding drawing according to claim 1, characterized in that: The pressure value of the pressure chamber is 0.2MPa.

5. The lubricating liquid-gas mixing structure for aluminum wire bonding drawing according to claim 1, characterized in that: The wire drawing mechanism comprises a sealing sleeve, in which a first wire drawing die and a second wire drawing die are axially distributed, and the wire moves from the first wire drawing die to the second wire drawing die. The sealing sleeve is provided with a liquid inlet pipe and a liquid outlet pipe, and the liquid inlet pipe is connected to the pressure chamber.

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