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CN-224234115-U - Chopper structure

CN224234115UCN 224234115 UCN224234115 UCN 224234115UCN-224234115-U

Abstract

The utility model belongs to the technical field of riving knives, and discloses a riving knife structure, which comprises a riving knife substrate, wherein a V-shaped groove structure is arranged at the end part of the riving knife substrate, a groove bottom arc part is arranged at the groove bottom of the V-shaped groove structure, arc end parts are arranged at the joint parts of the lower parts of two sides of the V-shaped groove structure and the riving knife substrate, anti-accumulation grooves are symmetrically distributed along the V-shaped groove walls, arc transition parts are arranged at the joint parts of the two sides of the V-shaped groove structure and the riving knife substrate, the curvature radius of the arc transition parts is connected with the groove bottom arc part through continuous curvature gradient change, and a tetrahedron hydrogen-free amorphous carbon film coating is coated on the surface of the riving knife substrate. According to the utility model, the stress concentration area is effectively dispersed by optimizing the arc transition design and the continuous curvature gradient change of the V-shaped groove structure, so that the local deep abrasion caused by the traditional single arc structure is avoided, and the durability of the riving knife under the high-frequency bonding working condition is prolonged.

Inventors

  • CHEN RONGHUA
  • HU XIUCHUN

Assignees

  • 深圳市摆渡微电子有限公司

Dates

Publication Date
20260512
Application Date
20250506

Claims (9)

  1. 1. The utility model provides a riving knife structure, includes riving knife base member (10), its characterized in that, the tip of riving knife base member (10) is equipped with V groove structure (11), the tank bottom of V groove structure (11) is equipped with tank bottom circular arc portion (12), the junction of both sides lower part and riving knife base member (10) of V groove structure (11) is equipped with circular arc tip (13); The inner side wall of the V-shaped groove structure (11) is provided with anti-accumulation grooves (14), and the anti-accumulation grooves (14) are symmetrically distributed along the wall of the V-shaped groove; The two sides of the V-shaped groove structure (11) are respectively provided with an arc transition part (15) at the joint of the V-shaped groove structure and the riving knife base body (10), and the curvature radius of the arc transition parts (15) is connected with the groove bottom arc parts (12) through continuous curvature gradient change.
  2. 2. The riving knife structure according to claim 1, wherein the surface of the riving knife substrate (10) is coated with a wear resistant coating.
  3. 3. The riving knife structure according to claim 1, characterized in that the radius of the arc portion (12) of the groove bottom is 0.01 mm-0.80 mm, and the radius of the arc end portion (13) is 0.05 mm-0.60 mm.
  4. 4. The riving knife structure according to claim 1, wherein the curvature radius variation gradient of the arc transition part (15) is 1% -20%, and the joint smoothness error with the arc part (12) of the groove bottom is less than or equal to 0.1mm.
  5. 5. The riving knife structure according to claim 1, wherein the anti-accumulation groove (14) has a depth of 0.005 mm-0.10 mm and a width of 0.1 mm-0.8 mm, and the groove bottom is provided with an inclination angle of 5 ° to 20 °.
  6. 6. The riving knife structure according to claim 2, wherein the wear-resistant coating has a thickness of 0.5-6.8 μm, a surface hardness of not less than 2000HV, and a coefficient of friction of not more than 0.3.
  7. 7. The riving knife structure according to claim 1, wherein the upper and lower sides of the end portion of the riving knife base body (10) are provided with first inclined surfaces (16) which are in smooth transition with the chamfer angle of the circular arc end portion (13).
  8. 8. The riving knife structure according to claim 1, characterized in that the front surface of the riving knife base body (10) is provided with a square surface (17), the front surface of the end part of the riving knife base body (10) is provided with a second inclined surface (18), and the square surface (17) is connected with the second inclined surface (18) and is in arc transition connection with the arc transition part (15) at one side.
  9. 9. The riving knife structure according to claim 1, characterized in that a third inclined surface (19) is provided on the back surface of the end portion of the riving knife base body (10), and the length of the third inclined surface (19) is smaller than that of the second inclined surface (18) and is in arc transition connection with the arc transition portion (15) on the other side.

Description

Chopper structure Technical Field The utility model belongs to the technical field of riving knives, and particularly relates to a riving knife structure. Background At present, a tungsten steel matrix design is mostly adopted in a chopper widely used in the field of semiconductor packaging and microelectronic bonding. The V-shaped groove structure is usually formed by single arc transition, and the surface treatment is mainly mechanical polishing and assisted by a sand blasting process. In the prior art, the single arc transition of the V-shaped groove easily causes stress concentration at the junction of the groove bottom and the side wall, and after long-term high-frequency use, partial abrasion is easily formed in the middle of the V-shaped groove, so that bonding offset or welding spot deformation is caused. Disclosure of utility model In order to solve the technical problems, the utility model provides a riving knife structure, which aims to solve the technical problems that in the prior art, single arc transition of a V-shaped groove easily causes stress concentration at the junction of the groove bottom and the side wall, local abrasion is easily formed in the middle of the V-shaped groove after long-term high-frequency use, and bonding offset or welding spot deformation is caused to a certain extent. The technical scheme of the utility model is that the riving knife structure comprises a riving knife matrix, wherein the end part of the riving knife matrix is provided with a V-shaped groove structure, the groove bottom of the V-shaped groove structure is provided with a groove bottom arc part, and the joint part of the lower parts of the two sides of the V-shaped groove structure and the riving knife matrix is provided with an arc end part; The inner side wall of the V-shaped groove structure is provided with anti-accumulation grooves which are symmetrically distributed along the wall of the V-shaped groove; The joint parts of the two sides of the V-shaped groove structure and the riving knife base body are respectively provided with an arc transition part, and the curvature radius of each arc transition part is connected with the arc part of the groove bottom through continuous curvature gradient change; further, the surface of the riving knife matrix is coated with a wear-resistant coating. Further, the radius of the arc part of the groove bottom is 0.01-0.80 mm, and the radius of the arc end part is 0.05-0.60 mm. Further, the curvature radius change gradient of the arc transition part is 1% -20%, and the connection smoothness error with the arc part of the groove bottom is less than or equal to 0.1mm. Further, the depth of the anti-accumulation groove is 0.005 mm-0.10 mm, the width of the anti-accumulation groove is 0.1 mm-0.8 mm, and the bottom of the groove is provided with an inclined angle of 5-20 degrees. Further, the thickness of the wear-resistant coating is 0.5-6.8 mu m, the surface hardness is more than or equal to 2000HV, and the friction coefficient is less than or equal to 0.3. Further, the upper side and the lower side of the end part of the riving knife matrix are respectively provided with a first inclined plane, and the first inclined planes are smoothly transited with the arc end chamfer. Further, the front face of the riving knife matrix is provided with a square face, the front face of the end part of the riving knife matrix is provided with a second inclined plane, and the square face is connected with the second inclined plane and is in arc transition connection with the arc transition part on one side. Further, a third inclined plane is arranged on the back surface of the end part of the riving knife matrix, the length of the third inclined plane is smaller than that of the second inclined plane, and the third inclined plane is in arc transition connection with the arc transition part on the other side. One or more technical solutions provided in the embodiments of the present application at least have the following technical effects or advantages: 1. According to the application, the stress concentration area is effectively dispersed by optimizing the arc transition design and the continuous curvature gradient change of the V-shaped groove structure, so that the local deep abrasion caused by the traditional single arc structure is avoided, and the durability of the riving knife under the high-frequency bonding working condition is prolonged. 2. The anti-accumulation groove is arranged, so that the impurity flow can be actively guided, the residue accumulation is reduced, the notch blocking risk is reduced, the surface adhesion and friction loss are further reduced by combining the wear-resistant coating, and the consistency of the bonding process and the quality of welding spots are ensured. Drawings In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be