Part finish machining cutting blade

Abstract

The utility model discloses a part finish machining cutting blade which comprises a blade body, an arc edge and a cutting edge extend towards a chip breaking table to form a front blade face, a chip breaking groove comprises the chip breaking table and a chip containing groove, the chip breaking table comprises a conical boss, an arc-surface chip breaking table and a transverse chip breaking table, the conical boss is connected with the front blade face through the arc-surface chip breaking table, and the transverse chip breaking table is connected with the front blade face through the arc-surface chip breaking table. Transverse chip breaking tables are arranged at the two ends of the cambered surface chip breaking table respectively, and the chip breaking tables intersect with the front tool face to form chip containing grooves. By adopting the double-rake-angle structure, the strength and cutting force of the cutting unit are improved, and the service life is prolonged. Through the special chip breaking structure of the cambered surface chip breaking table, the transverse chip breaking table and the conical boss, curling of iron chips can be effectively guided and controlled, the iron chips flow to the unmachined surface, and the surface smoothness of a machined workpiece is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of cemented carbide blades, and more specifically to a part finishing cutting blade. Background Art

[0002] The turbocharger is an important part of modern internal combustion engines, and its shell processing requires high precision and high wear resistance. The turbine shell has a compact and complex structure, high performance requirements, high precision, and high machining process difficulty. Due to the material characteristics of the turbine itself, it is difficult to break the iron chips. In the processing of the turbocharger shell, the requirements for the cutting blade are high, and it is necessary to take into account both efficient cutting and long life. In particular, in order to obtain a good processing surface, it is also necessary to control the flow direction of the iron chips.

[0003] In order to consider the service life of the cutting edge and the surface finish of the workpiece, CN107378010A is an indexable cutting blade. The blade body is provided with separated protrusions 1 and 2, and a first rake face that changes in sections; the protrusion is connected to the chip breaker groove, and the chip breaker groove includes a circular arc cutting edge connected in sequence from the circular arc cutting edge to the blade positioning center hole, a first rake face that changes in sections, a second rake face, a chip breaker groove bottom, a chip breaker face, and a top plane; the chip breaker face and the top plane are provided on the protrusion 1. The setting of the first rake face and the protrusion of the indexable cutting blade of this patent effectively balances the sharpness and strength of the cutting edge, is not prone to chipping, and has a good cutting effect; when cutting high-temperature alloys, not only can a good surface finish be obtained, but also the wear resistance of the indexable blade is ensured, the curling and breaking of the chips can be effectively controlled, and the chips can be discharged smoothly. However, due to the inherent characteristics of the processing object and the small processing workspace, the above structure has hidden dangers in guiding the chip discharge direction, which will cause the chips to affect the processed surface and cause scratch defects on the workpiece. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a cutting blade for finishing parts in view of the insufficient chip control ability of existing blades for machining precision parts of turbine shells.

[0005] The purpose of the utility model is achieved through the following technical solutions:

[0006] A part finishing cutting blade comprises a blade body, wherein the blade body is a polygonal body, a positioning center hole is arranged at the geometric center of the blade body, a cutting unit is arranged at the top corner, and the cutting unit comprises an arc edge, a cutting edge and a chip breaker groove.

[0007] The blade body includes an upper positioning surface, a bottom fixing surface, and a side wrapping surface connecting the upper positioning surface and the bottom fixing surface. Adjacent side wrapping surfaces are connected by an arc surface. The arc surface intersects with the upper positioning surface to form an arc cutting edge, and the side wrapping surface intersects with the upper positioning surface to form a cutting edge. The arc cutting edge and the cutting edge extend towards the positioning center hole to form a rake face, and the chip breaker groove is connected to the rake face.

[0008] The chip breaker groove includes a chip breaking platform and a chip accommodating groove. The chip breaking platform includes a conical boss, an arc-shaped chip breaking platform, and a transverse chip breaking platform. The conical boss is connected to the rake face through the arc-shaped chip breaking platform. Transverse chip breaking platforms are respectively arranged at both ends of the arc-shaped chip breaking platform. The arc-shaped chip breaking platform can curl or break the chip and guide the direction of the iron chip outflow. The transverse chip breaking platform can prevent the chip winding phenomenon caused by the chip flowing towards the center hole. The chip breaking platform intersects with the rake face to form a chip accommodating groove.

[0009] Further, the vertex angle of the cutting unit is 50 - 60°.

[0010] Further, a concave chip guiding column circular surface is also provided on the rake face between the chip breaking platform and the arc cutting edge. On the one hand, it can accommodate chips, and on the other hand, it can guide the iron chips to flow towards the chip breaking platform.

[0011] Further, the radius of the chip guiding column circular surface is 0.3 - 0.5 mm, and the included angle between the intersection line of the column circular surface and the angular bisecting plane of the cutting edge and the upper positioning surface is 5 - 10°.

[0012] Further, the rake face includes a first rake face and a second rake face. The angle α formed by the first rake face and the upper positioning surface is 5 - 10°, and the angle β formed by the second rake face and the upper positioning surface is 10 - 20°.

[0013] Further, the width L1 of the first rake face land is 0.05 - 0.15 mm.

[0014] Further, the horizontal width L2 from the arc cutting edge to the conical boss is 1 - 1.5 mm.

[0015] Further, the distance L3 from the transverse chip breaking platform to the arc cutting edge is 0.5 - 1.5 mm.

[0016] Further, the distance from the highest point of the arc surface of the arc-shaped chip breaking platform to the upper positioning surface is 0.10 - 0.15 mm, and the distance to the arc cutting edge is 0.8 - 1.2 mm.

[0017] Further, the included angle γ between the conical surface of the conical boss and the bottom fixing surface is 30 - 50°.

[0018] Further, the vertical height H1 from the lowest surface of the chip accommodating groove to the arc cutting edge is 0.1 - 0.2 mm.

[0019] Furthermore, the cutting unit of the blade body is not less than one.

[0020] Compared with the prior art, the beneficial effects are as follows:

[0021] The cutting blade of the present utility model adopts a double rake angle structure, which fully ensures the sharpness of the blade and takes into account a certain strength. Through the special chip breaking structure of the arc chip breaker, the transverse chip breaker and the conical boss, the present application can effectively guide and control the curling and flow direction of the iron chips to the unprocessed surface, thereby avoiding the influence of the chips on the surface finish of the processed surface and ensuring the surface finish of the machined part. Description of the Drawings

[0022] Figure 1 is a perspective view of the structure of the present utility model;

[0023] Figure 2 is a partial enlarged view of the cutting unit E;

[0024] Figure 3 is a front view of the structure of the present utility model;

[0025] Figure 4 is Figure 3 a cross-sectional view of the blade shown along line D-D;

[0026] Wherein, 1 is the blade body, 2 is the upper positioning surface, 3 is the bottom fixing surface, 4 is the side surface, 5 is the arc surface, 6 is the cutting edge, 7 is the arc edge, 8 is the first rake face of the cutting edge, 9 is the second rake face of the cutting edge, 10 is the first rake face of the arc edge, 11 is the second rake face of the arc edge, 12 is the chip breaker groove, 13 is the conical boss, 15 is the positioning center hole, 18 is the chip pocket, 19 is the arc chip breaker, and 20 is the transverse chip breaker. Detailed Embodiments

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0028] It should be noted that if there are directional indications (such as up, down, left, right, front, back) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will also change accordingly. If there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one such feature.

[0029] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, terms such as "installation", "provided with", "connection", etc. shall be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0031] Embodiment 1

[0032] A precision machining cutting blade for parts, including a diamond-shaped blade body 1, a positioning center hole 15 is provided at its geometric center, the angle of the vertex angle is 55°, and a cutting unit is provided. The cutting unit includes an arc edge 7, a cutting edge 6, and a chip breaker groove 12;

[0033] The blade body 1 includes an upper positioning surface 2, a bottom fixing surface 3, and 4 side surface wrapping surfaces connecting the upper positioning surface 2 and the bottom fixing surface 3. The adjacent side surface wrapping surfaces at the beginning of the cutting unit are connected by an arc surface 5. The arc surface 5 intersects with the upper positioning surface 2 to form an arc edge 7. The side surface wrapping surface intersects with the upper positioning surface 2 to form a cutting edge 6. The arc edge 7 and the cutting edge 6 extend towards the positioning center hole 15 to have a rake face, and the chip breaker groove 12 is connected to the rake face;

[0034] The chip-breaking groove 12 includes a chip-breaking platform and a chip-containing groove 18. The chip-breaking platform includes a conical boss 13, an arc-shaped chip-breaking platform 19, and a transverse chip-breaking platform 20. The conical boss 13 is connected to the rake face through the arc-shaped chip-breaking platform 19. Transverse chip-breaking platforms 20 are respectively arranged at both ends of the arc-shaped chip-breaking platform 19. The arc-shaped chip-breaking platform 19 can curl or break the chip and guide the direction of the chip outflow. The transverse chip-breaking platform 20 can prevent the chip from flowing towards the center hole and causing the chip to wind around the tool. The conical surface of the conical boss 13 is an inclined shape with a continuously increasing height from the rake face to the positioning center hole 15. The chip-breaking platform and the rake face form a V-shaped chip-containing groove 18.

[0035] Embodiment 2

[0036] A precision machining cutting blade for a part includes a diamond-shaped blade body 1 with a positioning center hole 15 at its geometric center, and the angle of the vertex angle is 55°. It is provided with a cutting unit, and the cutting unit includes an arc edge 7, a cutting edge 6, and a chip-breaking groove 12;

[0037] The blade body 1 includes an upper positioning surface 2, a bottom fixing surface 3, and 4 side surface wrapping surfaces connecting the upper positioning surface 2 and the bottom fixing surface 3. The adjacent side surface wrapping surfaces at the beginning of the cutting unit are connected by an arc surface 5. The arc surface 5 intersects with the upper positioning surface 2 to form an arc edge 7. The side surface wrapping surface intersects with the upper positioning surface 2 to form a cutting edge 6. The arc edge 7 and the cutting edge 6 extend towards the positioning center hole 15 to have a rake face, and the chip-breaking groove 12 is connected to the rake face;

[0038] The rake face includes a first rake face and a second rake face. The arc edge 7 extends to form a first rake face of the arc edge 10. The cutting edge 6 extends to form a first rake face of the cutting edge 8. The first rake face of the arc edge 10 and the first rake face of the cutting edge 8 are connected to form a first rake face. The first rake face of the arc edge 10 extends towards the chip-breaking platform to form a second rake face of the arc edge 11. The first rake face of the cutting edge 8 extends towards the chip-breaking platform to form a second rake face of the cutting edge 9.

[0039] The chip-breaking groove 12 includes a chip-breaking platform and a chip-containing groove 18. The chip-breaking platform includes a conical boss 13, an arc-shaped chip-breaking platform 19, and a transverse chip-breaking platform 20. The conical boss 13 is connected to the rake face through the arc-shaped chip-breaking platform 19. Transverse chip-breaking platforms 20 are respectively arranged at both ends of the arc-shaped chip-breaking platform 19. The arc-shaped chip-breaking platform 19 can curl or break the chip and guide the direction of the chip outflow. The transverse chip-breaking platform 20 can prevent the chip from flowing towards the center hole and causing the chip to wind around the tool. The conical surface of the conical boss 13 is an inclined shape with a continuously increasing height from the rake face to the positioning center hole 15. The chip-breaking platform and the second rake face of the arc edge 11 and the second rake face of the cutting edge 9 form a V-shaped chip-containing groove 18.

[0040] Embodiment 3

[0041] A precision machining cutting blade for a part, comprising a diamond-shaped blade body 1, a positioning center hole 15 is provided at its geometric center, the angle of the vertex angle is 55°, and a cutting unit is provided. The cutting unit includes an arc cutting edge 7, a cutting edge 6 and a chip breaker groove 12;

[0042] The blade body 1 includes an upper positioning surface 2, a bottom fixing surface 3 and 4 side surface wrapping surfaces connecting the upper positioning surface 2 and the bottom fixing surface 3. The adjacent side surface wrapping surfaces at the beginning of the cutting unit are connected by an arc surface 5. The arc surface 5 intersects with the upper positioning surface 2 to form an arc cutting edge 7, and the side surface wrapping surface intersects with the upper positioning surface 2 to form a cutting edge 6. The arc cutting edge 7 and the cutting edge 6 extend towards the positioning center hole 15 to form a rake face, and the chip breaker groove 12 is connected to the rake face;

[0043] The rake face includes a first rake face and a second rake face. The arc cutting edge 7 extends to form an arc cutting edge first rake face 10, the cutting edge 6 extends to form a cutting edge first rake face 8, and the arc cutting edge first rake face 10 and the cutting edge first rake face 8 are connected to form a first rake face. The angle α formed by the first rake face and the upper positioning surface 2 is 5-10°, and the land width L1 of the first rake face is 0.05-0.15 mm. The arc cutting edge first rake face 10 extends towards the chip breaker platform to form an arc cutting edge second rake face 11, the cutting edge first rake face 8 extends towards the chip breaker platform to form a cutting edge second rake face 9, and the angle β formed by the second rake face and the upper positioning surface 2 is 10-20°.

[0044] The chip breaker groove 12 includes a chip breaker platform and a chip pocket 18. The chip breaker platform includes a conical boss 13, an arc chip breaker platform 19 and a transverse chip breaker platform 20. The conical boss 13 is connected to the rake face through the arc chip breaker platform 19. Transverse chip breaker platforms 20 are respectively provided at both ends of the arc chip breaker platform 19. The arc chip breaker platform 19 can curl or break the chip and guide the direction of the iron chip flow. The transverse chip breaker platform 20 can prevent the chip from flowing towards the center hole and causing the chip to wind around the tool. The conical surface of the conical boss 13 is an inclined shape with an increasing height from the rake face to the positioning center hole 15, and the included angle γ between the conical surface and the bottom fixing surface 3 is 30-50°. The horizontal width L2 from the arc cutting edge 7 to the conical boss 13 is 1-1.5 mm. The chip breaker platform and the arc cutting edge second rake face 11 and the cutting edge second rake face 9 form a V-shaped chip pocket 18, and the vertical height H1 from the bottom of the chip pocket 18 to the arc cutting edge 7 is 0.1-0.2 mm.

[0045] Example 4

[0046] A precision machining cutting blade for a part, such as Figures 1 to 4 comprises a diamond-shaped blade body 1, a positioning center hole 15 is provided at its geometric center, the angle of the vertex angle is 55°, and a cutting unit is provided. The cutting unit includes an arc cutting edge 7, a cutting edge 6 and a chip breaker groove 12;

[0047] The blade body 1 includes an upper positioning surface 2, a bottom fixing surface 3, and four side surface wrapping surfaces connecting the upper positioning surface 2 and the bottom fixing surface 3. The adjacent side surface wrapping surfaces at the beginning of the cutting unit are connected by an arc surface 5. The arc surface 5 intersects with the upper positioning surface 2 to form an arc cutting edge 7. The side surface wrapping surface intersects with the upper positioning surface 2 to form a cutting edge 6. The arc cutting edge 7 and the cutting edge 6 extend towards the positioning center hole 15 to form a rake face, and the chip breaker groove 12 is connected to the rake face.

[0048] The rake face includes a first rake face and a second rake face. The arc cutting edge 7 extends to form an arc cutting edge first rake face 10, and the cutting edge 6 extends to form a cutting edge first rake face 8. The arc cutting edge first rake face 10 and the cutting edge first rake face 8 are connected to form the first rake face. The angle α formed by the first rake face and the upper positioning surface 2 is 5 - 10°, and the land width L1 of the first rake face is 0.05 - 0.15 mm. The arc cutting edge first rake face 10 extends towards the chip breaker platform to form an arc cutting edge second rake face 11, and the cutting edge first rake face 8 extends towards the chip breaker platform to form a cutting edge second rake face 9. The angle β formed by the second rake face and the upper positioning surface 2 is 10 - 20°.

[0049] The chip breaker groove 12 includes a chip breaker platform and a chip pocket 18. The chip breaker platform includes a conical boss 13, an arc chip breaker platform 19, and a transverse chip breaker platform 20. The conical boss 13 is connected to the rake face through the tangent arc chip breaker platform 19. The highest point of the arc surface of the arc chip breaker platform 19 is 0.13 mm away from the upper positioning surface and 1 mm away from the arc cutting edge. Transverse chip breaker platforms 20 are respectively arranged at both ends of the arc chip breaker platform 19. The distance L3 from the transverse chip breaker platform to the arc cutting edge is 0.5 - 1.5 mm. The arc chip breaker platform 19 can curl or break the chip and guide the direction of the iron chip outflow. The transverse chip breaker platform 20 can prevent the chip from flowing towards the center hole and causing the chip winding around the tool phenomenon. The conical surface of the conical boss 13 is an inclined shape with an increasing height from the rake face to the positioning center hole 15, and the included angle γ between the conical surface and the bottom fixing surface 3 is 30 - 50°. The horizontal width L2 from the arc cutting edge 7 to the conical boss 13 is 1 - 1.5 mm. The chip breaker platform and the arc cutting edge second rake face 11 and the cutting edge second rake face 9 form a V-shaped chip pocket 18. The vertical height H1 from the bottom of the chip pocket 18 to the arc cutting edge 7 is 0.1 - 0.2 mm.

[0050] An inward concave chip guiding column circular surface is also provided on the second rake face between the chip breaker platform and the arc cutting edge 7, with a radius of 0.3 - 0.5 mm. The intersection line of the column circular surface and the angular bisecting plane of the cutting edge and the included angle with the upper positioning surface 2 is 5 - 10°. The chip guiding column circular surface can hold chips on the one hand and guide the iron chips to the chip breaker platform on the other hand.

[0051] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A cutting blade for finishing parts, characterized in that: The blade body is a polygonal body, a positioning center hole is provided at the geometric center, and a cutting unit is provided at the top corner, and the cutting unit includes an arc edge, a cutting edge and a chip breaker groove; The blade body comprises an upper positioning surface, a bottom fixing surface and a side wrapping surface connecting the upper positioning surface and the bottom fixing surface, the adjacent side wrapping surfaces are connected by an arc surface, the arc surface intersects with the upper positioning surface to form an arc edge, the side wrapping surface intersects with the upper positioning surface to form a cutting edge, the arc edge and the cutting edge extend toward the positioning center hole to form a rake face, and the chip breaker groove is connected to the rake face; The chip breaker groove includes a chip breaking platform and a chip containing groove. The chip breaker platform includes a conical boss, a curved chip breaker platform and a transverse chip breaker platform. The conical boss is connected to the front cutting edge through the curved chip breaker platform. Transverse chip breaking platforms are respectively provided at both ends of the curved chip breaker platform. The chip breaker platform intersects with the front cutting edge to form a chip containing groove.

2. The part finishing cutting insert according to claim 1, characterized in that: The top angle of the cutting unit is 50-60°.

3. The part finishing cutting insert according to claim 1, characterized in that: A concave chip guiding column circular surface is also provided on the front cutting edge surface between the chip breaker and the circular arc edge.

4. The part finishing cutting insert according to claim 3, characterized in that: The radius of the chip guiding column circular surface is 0.3-0.5 mm, and the angle between the intersection line of the cylindrical circular surface and the cutting edge angle bisector plane and the upper positioning surface is 5-10°.

5. The part finishing cutting insert according to claim 1, characterized in that: The rake face comprises a first rake face and a second rake face, the angle α formed by the first rake face and the upper positioning surface is 5-10°, and the angle β formed by the second rake face and the upper positioning surface is 10-20°.

6. The part finishing cutting insert according to claim 5, characterized in that: The width L1 of the first rake face land is 0.05-0.15 mm, the horizontal width L2 from the arc edge to the conical boss is 1-1.5 mm, and the distance L3 from the transverse chip breaker to the arc edge is 0.5-1.5 mm.

7. The part finishing cutting insert according to claim 1, characterized in that: The highest point of the arc surface of the arc surface chip breaker is 0.10-0.15 mm away from the upper positioning surface, and 0.8-1.2 mm away from the arc edge.

8. The part finishing cutting insert according to claim 1, characterized in that: The included angle γ between the conical surface of the conical boss and the bottom fixing surface is 30-50°.

9. The part finishing cutting insert according to claim 1, characterized in that: The vertical height H1 from the lowest surface of the chip groove to the arc edge is 0.1-0.2 mm.

10. The part finishing cutting insert according to claim 1, characterized in that: The blade body has at least one cutting unit.

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