Chopping knife structure

Abstract

The utility model belongs to the technical field of riving knives, and discloses a riving knife structure which comprises a riving knife base body, a V-groove structure is arranged at the end of the riving knife base body, a groove bottom arc portion is arranged at the groove bottom of the V-groove structure, and arc end portions are arranged at the connecting positions of the lower portions of the two sides of the V-groove structure and the riving knife base body. The inner side wall of the V-shaped groove structure is provided with anti-accumulation grooves, and the anti-accumulation grooves are symmetrically distributed along the V-shaped groove wall; arc transition parts are arranged at the joints of the two sides of the V-groove structure and the chopper base body, the curvature radiuses of the arc transition parts are connected with the groove bottom arc parts through continuous curvature gradient changes, and the surface of the chopper base body is coated with a tetrahedral hydrogen-free amorphous carbon film coating. By optimizing the arc transition design and the continuous curvature gradient change of the V-groove structure, the stress concentration area is effectively dispersed, local deep abrasion caused by a traditional single arc structure is avoided, and therefore the durability of the chopper under the high-frequency bonding working condition is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of splitting knife technology, and specifically relates to a splitting knife structure. Background Technology

[0002] Currently, the V-grooves widely used in semiconductor packaging and microelectronic bonding are mostly designed with a tungsten steel substrate. Their V-groove structure is usually composed of a single circular arc transition, and the surface treatment is mainly mechanical polishing, supplemented by sandblasting.

[0003] In the prior art, the single circular arc transition of the V-groove can easily lead to stress concentration at the junction of the bottom of the groove and the sidewall. After long-term high-frequency use, local wear is likely to form in the middle of the V-groove, causing bonding misalignment or solder joint deformation. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a splitting blade structure, which aims to solve to some extent the technical problem in the prior art where the single circular arc transition of the V-groove easily leads to stress concentration at the junction of the groove bottom and sidewall, and after long-term high-frequency use, it is easy to form local wear in the middle of the V-groove, causing bonding misalignment or solder joint deformation.

[0005] The technical solution of this utility model is: a chopping knife structure, including a chopping knife base, the end of the chopping knife base is provided with a V-groove structure, the bottom of the V-groove structure is provided with a groove bottom arc portion, and the lower parts of both sides of the V-groove structure are provided with arc ends at the connection between them and the chopping knife base;

[0006] The inner wall of the V-groove structure is provided with anti-accumulation grooves, which are symmetrically distributed along the V-groove wall.

[0007] Both sides of the V-groove structure are provided with arc transition sections at the junction with the chopping blade base. The radius of curvature of the arc transition section is connected to the arc section at the bottom of the groove through a continuous curvature gradient change.

[0008] Furthermore, the surface of the cleaver substrate is coated with a wear-resistant coating.

[0009] Furthermore, the radius of the arc portion at the bottom of the groove is 0.01mm to 0.80mm, and the radius of the arc end is 0.05mm to 0.60mm.

[0010] Furthermore, the curvature radius of the arc transition portion varies with a gradient of 1% to 20%, and the smoothness error of the connection with the arc portion at the bottom of the groove is ≤0.1mm.

[0011] Furthermore, the depth of the anti-accumulation groove is 0.005mm to 0.10mm, the width is 0.1mm to 0.8mm, and the bottom of the groove has an inclination angle of 5° to 20°.

[0012] Furthermore, the wear-resistant coating has a thickness of 0.5–6.8 μm, a surface hardness of ≥2000 HV, and a coefficient of friction of ≤0.3.

[0013] Furthermore, the upper and lower sides of the end of the cleaver base are provided with first inclined surfaces, which smoothly transition to the chamfer of the rounded end.

[0014] Furthermore, the front of the chopping blade base is provided with a square surface, and the front of the end of the chopping blade base is provided with a second inclined surface. The square surface is connected to the second inclined surface and is connected to the arc transition part on one side in an arc transition.

[0015] Furthermore, the back end of the chopping blade base is provided with a third inclined surface, the length of which is less than the length of the second inclined surface, and it is connected to the arc transition portion on the other side in an arc transition.

[0016] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0017] 1. This application effectively disperses stress concentration areas by optimizing the arc transition design and continuous curvature gradient change of the V-groove structure, avoiding local deep wear caused by the traditional single arc structure, thereby extending the durability of the wedge under high-frequency bonding conditions.

[0018] 2. This application, through the anti-accumulation groove setting, can actively guide the flow of impurities and reduce the accumulation of residues, thereby reducing the risk of groove blockage; combined with the setting of wear-resistant coating, it further reduces surface adhesion and friction loss, ensuring the consistency of the bonding process and the quality of the solder joints. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a first-view structural diagram of the present invention;

[0021] Figure 2 This is a schematic diagram of the second-view structure of the present invention;

[0022] Figure 3 In this utility model Figure 1 A magnified view of part A.

[0023] In the attached image:

[0024] 10. Cleaver base; 11. V-groove structure; 12. Groove bottom arc; 13. Arc end; 14. Anti-accumulation groove; 15. Arc transition part; 16. First inclined surface; 17. Square surface; 18. Second inclined surface; 19. Third inclined surface. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0026] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0027] This application is described below with reference to the accompanying drawings and specific embodiments:

[0028] Please see Figure 1-3 A chopping blade structure includes a chopping blade base 10, with a V-groove structure 11 at one end. The bottom of the V-groove structure 11 has a bottom arc portion 12 with a radius of 0.01mm to 0.80mm, and the radius of the arc end portion 13 is 0.05mm to 0.60mm. This optimizes the stress distribution of the V-groove structure 11, reduces local stress concentration at the junction of the groove bottom and sidewall, and avoids deep wear caused by long-term high-frequency use.

[0029] The lower sides of the V-groove structure 11 are provided with arc-shaped ends 13 at the junction with the wedge base 10. This can improve the flow guidance of materials during the bonding process and reduce the retention of impurities at the groove opening. The design of the arc-shaped ends 13 can also disperse the impact of external loads on the wedge base 10, avoid stress abrupt changes caused by right angles or sharp edges, and improve the fatigue resistance of the wedge.

[0030] The inner wall of the V-groove structure 11 is provided with anti-accumulation grooves 14, which are symmetrically distributed along the V-groove wall. The depth of the anti-accumulation grooves 14 is 0.005mm to 0.10mm, the width is 0.1mm to 0.8mm, and the bottom of the grooves has an inclination angle of 5° to 20°. The anti-accumulation grooves 14 reduce the adhesion and accumulation of impurities. The inclination angle design further promotes the removal of impurities from the groove wall, avoids groove clogging, ensures the continuity of the bonding process and the consistency of the solder joints, and reduces the frequency of cleaning and maintenance.

[0031] Both sides of the V-groove structure 11 have arc-shaped transition portions 15 at their junctions with the cutting tool base 10. The radius of curvature of the arc-shaped transition portion 15 is connected to the arc portion 12 at the bottom of the groove through a continuous gradient of curvature. The gradient of the radius of curvature of the arc-shaped transition portion 15 is 1% to 20%, and the smoothness error of the connection with the arc portion 12 at the bottom of the groove is ≤0.1mm. This makes the stress distribution in the transition area between the V-groove structure 11 and the cutting tool base 10 more uniform, avoiding the propagation of microcracks caused by local stress peaks.

[0032] The surface of the cleaver substrate 10 is coated with a wear-resistant coating. The wear-resistant coating is a tetrahedral hydrogen-free amorphous carbon film coating with a thickness of 0.5 to 6.8 μm, a surface hardness of ≥2000 HV, and a coefficient of friction of ≤0.3. The coating is a special DLC coating, mainly composed of carbon atoms arranged in a special form, which has high hardness and wear resistance.

[0033] The upper and lower sides of the end of the chopping blade base 10 are provided with first inclined surfaces 16, which smoothly transition with the rounded end 13, thus optimizing the geometric symmetry of the end of the chopping blade and reducing stress concentration caused by abrupt changes in the edge during bonding.

[0034] The front of the chopping blade base 10 is provided with a square surface 17, and the front of the end of the chopping blade base 10 is provided with a second inclined surface 18. The square surface 17 is connected to the second inclined surface 18 and is connected to the arc transition part 15 on one side. This design can distribute the load and avoid local deformation.

[0035] The back end of the splitting blade base 10 has a third inclined surface 19. The length of the third inclined surface 116 is less than the length of the second inclined surface 18, and it is connected to the arc transition portion 15 on the other side in an arc transition. The length of the third inclined surface 116 is less than that of the second inclined surface 18, forming an asymmetrical structure, which can balance the force distribution in different directions during the bonding process and avoid uneven wear caused by excessive stress on one side. The connection design with the arc transition portion 15 further coordinates the mechanical properties of the back end of the splitting blade, enhancing the torsional resistance and durability of the overall structure.

[0036] It should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A chopping blade structure, comprising a chopping blade base (10), characterized in that, The end of the chopping blade base (10) is provided with a V-groove structure (11), the bottom of the V-groove structure (11) is provided with a groove bottom arc part (12), and the lower parts of both sides of the V-groove structure (11) are provided with arc end parts (13) at the connection between the lower part of the V-groove structure (11) and the chopping blade base (10). The inner wall of the V-groove structure (11) is provided with anti-accumulation grooves (14), which are symmetrically distributed along the V-groove wall; Both sides of the V-groove structure (11) are provided with arc transition parts (15) at the junction with the chopping base (10). The radius of curvature of the arc transition part (15) is connected to the arc part (12) at the bottom of the groove through a continuous curvature gradient change.

2. The cleaving structure as described in claim 1, characterized in that, The surface of the cleaver substrate (10) is coated with a wear-resistant coating.

3. The cleaving structure as described in claim 1, characterized in that, The radius of the arc portion (12) at the bottom of the groove is 0.01 mm to 0.80 mm, and the radius of the arc end portion (13) is 0.05 mm to 0.60 mm.

4. The cleaving structure as described in claim 1, characterized in that, The curvature radius of the arc transition section (15) varies by 1% to 20%, and the smoothness error of the connection with the arc section at the bottom of the groove (12) is ≤0.1mm.

5. The cleaving structure as described in claim 1, characterized in that, The depth of the anti-accumulation groove (14) is 0.005mm to 0.10mm, the width is 0.1mm to 0.8mm, and the bottom of the groove has an inclination angle of 5° to 20°.

6. The cleaving structure as described in claim 2, characterized in that, The wear-resistant coating has a thickness of 0.5–6.8 μm, a surface hardness of ≥2000 HV, and a coefficient of friction of ≤0.

3.

7. The cleaving structure as described in claim 1, characterized in that, The upper and lower sides of the end of the chopping blade base (10) are provided with first inclined surfaces (16), which smoothly transition with the chamfer of the arc end (13).

8. The cleaving structure as described in claim 1, characterized in that, The front of the chopping blade base (10) is provided with a square surface (17), and the front of the end of the chopping blade base (10) is provided with a second inclined surface (18). The square surface (17) is connected to the second inclined surface (18) and is connected to the arc transition part (15) on one side in an arc transition.

9. The cleaving structure as described in claim 1, characterized in that, The back end of the chopping blade base (10) is provided with a third inclined surface (19), the length of the third inclined surface (19) is less than the length of the second inclined surface (18), and it is connected to the arc transition part (15) on the other side in an arc transition.

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