Lead bonding chopper

Abstract

The utility model mainly provides a lead bonding chopper, which comprises a chopper handle and a chopper head, the chopper head is provided with a lead through groove for a metal lead to pass through, the lead through groove comprises an arc-shaped bottom surface and welding processing surfaces positioned on two sides of the arc-shaped bottom surface, and the welding processing surfaces are provided with surface textures. The surface height of the welding surface is basically consistent, the surface texture can guarantee that the surface has certain roughness, the welding spot failure caused by the fact that the aluminum wire or the copper wire cannot be pressed to effectively transmit ultrasonic energy due to the fact that the welding processing surface is too smooth can be avoided, and meanwhile the reliability of the welding spot can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of cleaver, especially a lead bonding cleaver. BACKGROUND

[0002] In the lead bonding process, the welding processing surface characteristics of the cleaver have a crucial influence on the bonding effect. In the prior art, the welding processing surface is too smooth, which brings a series of adverse effects.

[0003] From the aspect of contact with the metal wire, when the welding processing surface is too smooth, the first problem faced in contact with the aluminum wire or the copper wire is the stability of contact. In actual bonding operation, the cleaver needs to be able to stably fix the metal wire to ensure the accuracy of subsequent operation. However, the friction between the smooth welding processing surface and the metal wire is extremely small, which is difficult to provide sufficient holding force.

[0004] From the microscopic point of view, the surface of the aluminum wire and the copper wire is not absolutely smooth, but there is a microscopic fluctuation, and the too smooth welding processing surface cannot form effective mechanical engagement with the microscopic structure of the metal wire surface, which leads to the fact that the metal wire is easy to slide on the welding processing surface in the bonding process. Especially for the aluminum wire which is relatively soft in texture, due to its own characteristics, it is more likely to deform when subjected to external force, and the smooth welding processing surface cannot provide sufficient constraint, not only easy to make the aluminum wire deform unnecessarily in the bonding process, but also may cause its rupture. Moreover, the aluminum wire surface is easy to form an oxide layer, and the smooth welding processing surface is not conducive to penetrating this oxide film to form a good electrical connection with the aluminum wire. As for the copper wire, although its hardness is relatively high, it also needs the cleaver to be able to stably press down during bonding, and the smooth surface makes it difficult for the copper wire to fully adhere to the surface of the cleaver during the bonding process, affecting the subsequent operation.

[0005] Existing smooth welding surfaces have serious defects in ultrasonic energy transfer. Ultrasonic energy transfer is a crucial step in wire bonding, relying on close contact between the wedge and the metal wire. However, overly smooth welding surfaces hinder the effective transfer of ultrasonic energy. From an energy transfer efficiency perspective, smooth surfaces cannot effectively transfer the vibrational energy generated by the ultrasonic generator to the metal wire. During energy transfer, ultrasonic energy needs to be transferred from the wedge to the metal wire and then to the weld joint to promote the fusion of metal atoms. However, due to poor contact between the smooth surface and the metal wire, significant energy loss occurs during transfer, such as scattering and reflection, resulting in insufficient effective energy reaching the weld joint. Furthermore, regarding the uniformity of energy transfer, smooth surfaces lack structures to guide the uniform distribution of energy, leading to uneven ultrasonic energy transfer across the cross-section of the metal wire. This results in energy concentration in certain parts of the metal wire during weld joint formation, while other parts receive insufficient energy, leading to incomplete or excessive melting in certain areas, severely impacting weld quality.

[0006] These problems, caused by overly smooth welding surfaces, ultimately have a significant negative impact on the quality and reliability of the solder joints. Because the metal wires cannot be effectively pressed together for ultrasonic energy transfer, the metal atoms at the solder joint cannot fully fuse. In real-world applications, electronic products may be exposed to various external factors such as temperature changes and mechanical vibrations. Under these conditions, insufficiently fused solder joints are prone to cracking or detachment, leading to solder joint failure. Furthermore, uneven energy transfer can create defects such as pores and inclusions within the solder joint, weakening its structural strength and significantly reducing its reliability over long-term use. In fields with extremely high reliability requirements, such as aerospace and automotive electronics, low-reliability solder joints can pose serious safety hazards, affecting the normal operation of the entire equipment and even endangering life and property. Utility Model Content

[0007] To solve the above problems, this utility model proposes a wire bonding cutter, including a handle and a cutter head. The cutter head has a wire through groove for metal wires to pass through. The wire through groove includes an arc-shaped bottom surface and welding processing surfaces located on both sides of the arc-shaped bottom surface. The welding processing surfaces are provided with surface texture.

[0008] Furthermore, the surface texture includes a wear-resistant layer.

[0009] Furthermore, a bonding layer is included beneath the wear-resistant layer.

[0010] Furthermore, the wear-resistant layer is made of tungsten-doped diamond or chromium-doped diamond, and the bonding layer is made of tungsten nitride or chromium nitride.

[0011] Further, the surface texture of the welding processing surface is circular or polygonal.

[0012] Further, the surface texture is square, diamond, pentagonal or hexagonal.

[0013] Further, the surface of the arc-shaped bottom surface has a plurality of protrusions.

[0014] Further, the surface of the arc-shaped bottom surface has a plurality of grooves.

[0015] The beneficial effects of the utility model lie in that: through the surface texture on the welding processing surface of the utility model, the surface height of the welding surface is basically consistent, the surface texture can not only guarantee that the surface has a certain roughness, but also can avoid that the welding processing surface is too smooth to press the aluminum wire or copper wire to effectively transmit the ultrasonic energy and cause the welding point to fail, and meanwhile, the reliability of the welding point can be increased. In addition, the protrusions or grooves on the arc-shaped surface can increase the friction of the aluminum wire or copper wire and avoid that the copper wire or aluminum wire slides in the welding process. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without paying creative labor.

[0017] Fig. 1 It is the overall schematic view of the splitting knife of the utility model.

[0018] Fig. 2 It is the local enlarged view of the splitting knife head of the utility model.

[0019] Fig. 3 It is the side surface structure schematic view of the splitting knife head of the utility model.

[0020] REFERENCE NUMERALS

[0021] 1 handle

[0022] 2 head

[0023] 20 lead wire through slot

[0024] 21 arc-shaped bottom surface

[0025] 22 welding processing surface

[0026] 23 surface texture

[0027] 24 arc-shaped connecting surface

[0028] 25 groove

[0029] 26 wear layer

[0030] 27 bonding layer DETAILED DESCRIPTION

[0031] The following describes the embodiments of the present application by specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the description.

[0032] In the following description, reference is made to the accompanying drawings which form a part hereof, and which is shown by way of illustration of several embodiments of the present application. It is understood that other embodiments can be utilized and mechanical, structural, electrical, and operational changes can be made without departing from the spirit and scope of the present disclosure. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of various embodiments of the present application are defined only by the appended patent claims. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. Spatially relative terms, such as "upper", "lower", "left", "right", "below", "below", "bottom", "top", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures.

[0033] While the terms first, second, etc. can be used herein to describe various elements or parameters, these elements or parameters should not be limited by these terms. These terms are only used to distinguish one element or parameter from another element or parameter. For example, a first end can be termed a second end, and similarly, a second end can be termed a first end, without departing from the scope of the various described embodiments. Both the first end and the second end are an end, but they are not the same end unless the context clearly indicates otherwise.

[0034] Also, as used in the description herein, the singular forms "a", "an" and "the" are intended to include plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises", "comprising", "includes" and / or "including", as used herein, specify the presence of stated features, steps, operations, elements, components, items, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, items, and / or groups thereof. As used herein, the terms "or" and "and / or" are to be interpreted as inclusive, i.e., as meaning one or any combination of items. Thus, "A, B or C" or "A, B and / or C" means any of the following: A; B; C; A and B; A and C; B and C; A, B and C. Only when a combination of elements, functions, steps or operations is inherently mutually exclusive is an exception to this definition presented.

[0035] Reference is made to Figs. 1-3The utility model provides a wire bonding wedge, including handle 1 and tool bit 2, tool bit 2 has the wire through slot 20 for metal wire, and the wire through slot 20 includes arc bottom surface 21 and the welding processing surface 22 on both sides of arc bottom surface, is provided with surface texture 23 on the welding processing surface 22, and has arc connecting surface 24 at both ends of wire through slot 20, and a plurality of regular arrangement protrusions or grooves 25 are further provided on the surface of arc bottom surface 21, mainly for providing the friction of solder wire, but too much metal residue can be avoided through regular arrangement protrusions or grooves 25. Further including wear-resistant layer 26 on the surface texture 23 of welding processing surface 22, the reliability of welding processing surface can be improved through wear-resistant layer 26, further including bonding layer 27 below wear-resistant layer 26, and the bottom of bonding layer 27 is the base of tool bit 2, bonding layer 27 can avoid the wear-resistant layer 26 to fall off, increases the durability of wear-resistant layer 26, and wear-resistant layer 26 is tungsten-doped diamond material or chromium-doped diamond material, and bonding layer 27 is tungsten nitride or chromium nitride.

[0036] Need to be specially pointed out, the surface texture 23 of welding processing surface 22 is circular or polygonal, for example, can be square, diamond, pentagon or hexagon. Surface texture 23 and the protrusion or groove 25 of arc bottom surface 21 can be realized through laser processing and chemical etching.

[0037] In the utility model, unless another definite provision and limitation, for example, can be fixed connection, also can be detachable connection, or integration;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through intermediate medium, can be the intercommunication of two elements or the interaction of two elements, unless another definite limitation, for the ordinary skill in the art, can understand the specific meaning of the above-mentioned terms in the utility model according to specific circumstances.

[0038] The above is the preferred embodiment of the utility model, and it should be pointed out that, for ordinary skilled person in the prior art, on the premise of not departing from the principle of the utility model, a number of improvements and refinements can be made, and these improvements and refinements should be regarded as the protection scope of the utility model.

Claims

1. A wire bonding blade comprising a shank and a tip, characterized by: The tool bit has a lead wire through slot for a metal lead wire, the lead wire through slot includes an arc-shaped bottom surface and welding processing surfaces on both sides of the arc-shaped bottom surface, and the welding processing surfaces are provided with surface textures.

2. A wire bonding blade according to claim 1, wherein The surface textures further include wear-resistant layers.

3. A wire bonding blade according to claim 2, wherein The wear-resistant layers further include bonding layers.

4. A wire bonding blade according to claim 3, wherein The wear-resistant layers are tungsten-doped diamond materials or chromium-doped diamond materials, and the bonding layers are tungsten nitride or chromium nitride.

5. A wire bonding blade according to claim 1, wherein The surface textures of the welding processing surfaces are circular or polygonal.

6. A wire bonding blade according to claim 5, wherein, The surface textures are square, diamond, pentagonal or hexagonal.

7. A wire bonding blade according to claim 1, wherein The surface of the arc-shaped bottom surface has a plurality of protrusions.

8. A wire bonding blade according to claim 1, wherein The surface of the arc-shaped bottom surface has a plurality of grooves.

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