Wire welding chopper with destressing inner groove
By setting grooves in the middle of the chamfered rear tip of the wire welding cutting knife, the stress and strain at the roots of the welding points are concentrated, the problem of cracks easily formed at the roots of the welding points during welding is solved, and the welding quality is improved.
Patent Information
- Application Number
- CN202421530408.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-01
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-07-01
AI Technical Summary
Existing wire welding choppers can easily lead to cracks at the roots of the welding points during welding process, affecting the welding quality.
A wire welding chopper with a stress-removing inner groove is designed. A groove is provided at the chamfer of the tip of the knife, and the bottom wall of the groove is wavy, which concentrates the stress and strain at the root of the welding point.
By forming bumps at the root of the welding point, stress and strain are concentrated, the possibility of cracks forming in other locations at the root of the welding point is reduced, and the yield of welding is improved.
Smart Images
Figure CN222785256U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of welding choppers, in particular to a wire welding chopper with a stress-relieving inner groove. Background Art
[0002] The connection between the chip inside the semiconductor package and the external pins plays an important role in establishing the electrical connection between the chip and the outside and ensuring the smooth input / output between the chip and the outside world. It is the key to the entire back-end packaging process. Wire bonding is a dominant connection method due to its simple process, low cost, and applicability to a variety of packaging forms. Wire bonding is one of the main interconnection technologies in packaging. Other technologies include flip chip, wafer-level packaging, and through silicon via technology. Wire bonding is a process that uses thin metal wires and uses heat, pressure, and ultrasonic energy to tightly weld the metal leads to the substrate pads to achieve electrical interconnection between the chip and the substrate and information exchange between the chips. The main shapes of the wire bonding points are ball bonds and wedges. Under ideal control conditions, electron sharing or atomic diffusion will occur between the leads and the substrate, thereby achieving atomic-level bonding between the two metals.
[0003] Among them, the wedge welding knife is an important tool in the wire bonding process. The wire passes through the wire threading hole on the wedge welding knife and reaches the working surface of the knife tip. The working surface of the knife tip presses the wire onto the chip pad. Through the action of ultrasonic vibration and pressure, the wire and the pad form atomic bonds, thereby forming a stable and reliable solder joint between the wire and the chip pad. Since the wire outlet ring side of the wire threading hole of the wedge welding wedge welding knife are all angular, during welding, due to the high brittleness and poor toughness of the aluminum wire, the angular side of the wire outlet ring side can easily cause cracks at the root of the welding position. In the process of forming an arc, the bending of the root of the solder joint can also easily cause cracks, affecting the welding quality.
[0004] In view of this, there is an urgent need for a wire bonding cutter with a stress relief inner groove to solve the above problems. Utility Model Content
[0005] In view of the problems existing in the prior art, the utility model solves the problems with the following technical structure.
[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0007] A wire welding splitter with a stress-relieving inner groove comprises: a knife body, one end of the knife body is a knife head, and the other end is a mounting end, the suspended end of the knife head is provided with a prism-shaped welding end, one side of the end of the welding end is provided with a knife tip, a wire threading hole is provided on the welding end, the wire outlet end of the wire threading hole is located at the rear chamfer of the knife tip, and a groove is provided on the side of the wire outlet end of the wire threading hole away from the knife tip, and the groove is formed by being concavely arranged inwardly from the end of the welding end.
[0008] It is further characterized in that
[0009] The ring side of the cutter body is provided with a first plane extending from the cutter head suspension end to the mounting end, and the extension direction of the first plane is consistent with the axial direction of the cutter body.
[0010] The ring side of the cutter head is provided with a first inclined surface, and the first inclined surface extends from the suspension end of the cutter head to a side away from the first plane.
[0011] The included angle between the first inclined surface and the axial direction of the cutter body is 5 degrees to 20 degrees.
[0012] The included angle between the first inclined surface and the axial direction of the cutter body is 10 degrees.
[0013] The bottom wall of the groove is wavy, one side of the bottom wall of the groove is connected to the side wall of the threading hole, and the other side is connected to the end surface of the welding end.
[0014] The cutter head is provided with second inclined surfaces on both sides of the first plane and the first inclined surface, and the two second inclined surfaces extend from the suspension end of the cutter head to the sides away from each other.
[0015] The included angle between the two second inclined surfaces is 15 degrees to 25 degrees.
[0016] The included angle between the two second inclined surfaces is 20 degrees.
[0017] The length of the blade body is 19 mm to 30 mm.
[0018] The above structure of the utility model can achieve the following beneficial effects:
[0019] By setting a groove in the middle position of the back chamfer of the knife tip at the welding end, a convex point can be formed at the root of the weld during welding. The convex point concentrates the stress and strain at the root of the weld, thereby reducing the occurrence of cracks at other positions at the root of the weld and improving the welding yield. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a structural schematic diagram of this embodiment;
[0021] Figure 2 This is a structural cross-sectional view of the welding end in this embodiment;
[0022] Figure 3 This is a structural schematic diagram of another viewing angle of this embodiment;
[0023] Figure 4 Schematic diagram of the structure of the mounting end portion in this embodiment.
[0024] In the figure: 1, cutter head; 2, mounting end; 3, first plane; 4, first inclined surface; 5, welding end; 6, cutter tip; 7, threading hole; 8, second inclined surface; 9, groove. DETAILED DESCRIPTION
[0025] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.
[0026] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product or equipment comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.
[0027] The following is combined with Figure 1-4 This application is described in further detail.
[0028] like Figure 1-3 As shown, a wire welding splitter with a stress relief inner groove comprises: a blade body, one end of the blade body is a blade head 1, and the other end is a mounting end 2, the suspended end of the blade head 1 is provided with a prism-shaped welding end 5, one side of the end of the welding end 5 is provided with a blade tip 6, and the welding end 5 is provided with a wire threading hole 7, the wire outlet end of the wire threading hole 7 is located at the rear chamfer of the blade tip 6, and a groove 9 is provided on the side of the wire outlet end of the wire threading hole 7 away from the blade tip 6, and the groove 9 is formed inwardly from the end of the welding end 5. In this way, by providing the groove 9 at the middle position of the rear chamfer of the blade tip 6 of the welding end 5, a convex point can be formed at the root of the weld during welding, and the convex point concentrates the stress and strain at the root of the weld, thereby reducing the occurrence of cracks formed at other positions at the root of the weld, and improving the welding yield.
[0029] like Figure 2 As shown, the specific structure of the groove 9 can be: the bottom wall of the groove 9 is wavy (that is, the bottom wall of the groove 9 is transversely S-shaped), one side of the bottom wall of the groove 9 is connected to the side wall of the threading hole 7, and the other side is connected to the end face of the welding end 5. In this way, the formed convex point has a better effect of concentrating stress and strain.
[0030] like Figure 1 and 4As shown, the annular side of the cutter body is provided with a first plane 3 extending from the suspension end of the cutter head 1 to the mounting end 2, and the extension direction of the first plane 3 is consistent with the axial direction of the cutter body. In this way, a positioning flat is formed on the annular side of the mounting end 2 to facilitate installation and positioning, and to reduce the volume of the cutter head 1 and reduce interference.
[0031] like Figure 1-2 As shown, in order to further improve the avoidance ability of the wedge welding cutter, the cutter head 1 is provided with second bevels 8 on both sides of the first plane 3 and the first bevel 4, and the two second bevels 8 extend from the suspended end of the cutter head 1 to the side away from each other, so as to reduce the interference with the surrounding of the pad during welding, wherein the angle between the two second bevels 8 is 15 to 25 degrees (15, 20, 25, etc.), and in this embodiment, the angle between the two second bevels 8 is 20 degrees, and adaptive adjustment is performed according to demand during actual production.
[0032] like Figure 1-2 As shown, a first bevel 4 is provided on the ring side of the cutter head 1, and the first bevel 4 extends from the suspended end of the cutter head 1 to the side away from the first plane 3. By providing the first bevel 4, the volume of the cutter head 1 is reduced, and the interference with the surrounding of the welding pad during welding is further reduced. The angle between the first bevel 4 and the axial direction of the cutter body is preferably 5 to 20 degrees (for example, 5 degrees, 10 degrees, 15 degrees, 20 degrees, etc.). In this embodiment, the angle between the first bevel 4 and the axial direction of the cutter body is 10 degrees, and adaptive adjustment is performed according to demand during actual production.
[0033] It is further optimized that the length of the blade body is adjusted according to actual needs, wherein the length of the blade body is optimally 19 mm to 30 mm (eg 19 mm, 25 mm, 30 mm, etc.).
[0034] In summary, by setting the groove 9 in the middle position of the rear chamfer of the tip 6 of the welding end 5, a convex point can be formed at the root of the weld during welding. The convex point concentrates the stress and strain at the root of the weld, thereby reducing the occurrence of cracks at other positions at the root of the weld, and improving the welding yield.
[0035] The above are only preferred embodiments of the present application, and the present invention is not limited to the above embodiments. It is understood that other improvements and changes directly derived or associated by those skilled in the art without departing from the spirit and concept of the present invention should be considered to be included in the protection scope of the present invention.
Claims
1. A wire welding cutter with a stress relief inner groove, characterized in that: include: A knife body, one end of the knife body is a knife head (1), and the other end is a mounting end (2), the hanging end of the knife head (1) is provided with a prism-shaped welding end (5), one side of the end of the welding end (5) is provided with a knife tip (6), a wire threading hole (7) is provided on the welding end (5), the wire outlet end of the wire threading hole (7) is located at the rear chamfer of the knife tip (6), a groove (9) is provided on the side of the wire outlet end of the wire threading hole (7) away from the knife tip (6), and the groove (9) is formed by being concavely arranged inwardly from the end of the welding end (5).
2. A wire welding cutter with a stress relief inner groove according to claim 1, characterized in that: The ring side of the cutter body is provided with a first plane (3) extending from the suspension end of the cutter head (1) to the mounting end (2), and the extension direction of the first plane (3) is consistent with the axial direction of the cutter body.
3. A wire welding cutter with a stress relief inner groove according to claim 2, characterized in that: The ring side of the cutter head (1) is provided with a first inclined surface (4), and the first inclined surface (4) extends from the suspended end of the cutter head (1) to a side away from the first plane (3).
4. A wire welding cutter with a stress relief inner groove according to claim 3, characterized in that: The included angle between the first inclined surface (4) and the axial direction of the cutter body is in the range of 5 to 20 degrees.
5. The wire welding cutter with stress relief inner groove according to claim 4, characterized in that: The included angle between the first inclined surface (4) and the axial direction of the cutter body is 10 degrees.
6. The wire welding cutter with stress relief inner groove according to claim 1, characterized in that: The bottom wall of the groove (9) is wavy, one side of the bottom wall of the groove (9) is connected to the side wall of the threading hole (7), and the other side is connected to the end surface of the welding end (5).
7. The wire welding cutter with stress relief inner groove according to claim 1, characterized in that: The cutter head (1) is provided with second inclined surfaces (8) on both sides of the first plane (3) and the first inclined surface (4), and the two second inclined surfaces (8) extend from the suspension end of the cutter head (1) to the sides away from each other.
8. The wire welding cutter with stress relief inner groove according to claim 7, characterized in that: The included angle between the two second inclined surfaces (8) is in the range of 15 to 25 degrees.
9. The wire welding cutter with stress relief inner groove according to claim 8, characterized in that: The included angle between the two second inclined surfaces (8) is 20 degrees.
10. The wire bonding cutter with stress relief inner groove according to claim 1, characterized in that: The length of the blade body is 19 mm to 30 mm.