Multi-tooth cutting blade and cutting tool
By designing the V-tooth structure and inclined surface of the multi-tooth cutting insert, the problem of chip removal during the cutting process was solved, achieving efficient cutting and extending the service life of the insert.
Patent Information
- Application Number
- CN202422774955.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-14
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-11-14
AI Technical Summary
Existing multi-tooth cutting inserts are prone to wear during the cutting process, and the chips are difficult to remove effectively, affecting processing efficiency and service life.
Design a multi-tooth cutting insert with a V-tooth structure, continuous cutting edge and inclined surface, combined with U-shaped fixing groove and pressure block to ensure smooth chip discharge and enhance the rigidity and stability of the insert.
It improves cutting efficiency, extends the life of the cutting tool, avoids chip clogging, and enhances machining efficiency and cutting tool stability.
Smart Images
Figure CN223642804U_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of milling, and more particularly to a multi-tooth cutting insert and a cutting tool having the cutting insert. Background Technology
[0002] With the continuous development of metal cutting technology, the performance requirements for metal cutting tools are becoming increasingly stringent. Continuous optimization and improvement of tools during the design process will greatly enhance their cutting performance. To improve cutting performance, tools made of optimized cemented carbide or other wear-resistant materials are used. For economic reasons, cutting inserts are typically manufactured as multi-tooth, indexable, and reversible inserts with multiple cutting edges of the same structure. This allows for multi-stage machining of pulleys in a single operation, saving significant time spent on repetitive tool changes and improving production efficiency while reducing manufacturing costs. Therefore, cutting inserts are among the fastest-wearing and most consumable parts. It is desirable that cutting inserts be securely mounted on the tool holder, and that they possess good chip breaking and removal capabilities to extend their service life. Summary of the Invention
[0003] Based on this, the present invention aims to overcome the defects of the prior art and provide a multi-tooth cutting insert and a cutting tool.
[0004] A multi-tooth cutting insert, comprising:
[0005] The device comprises an upper surface, a lower surface, and peripheral side surfaces, wherein the upper surface and the side surfaces are perpendicular to each other. The upper surface is roughly a quadrilateral that is wider in the middle and narrower on both sides. Multiple identical and continuous V-shaped teeth are provided on both narrow sides. The ends of the side surfaces at the V-shaped teeth form cutting edges, including a pointed rounded cutting edge at the tip of the V-shaped teeth, a concave rounded cutting edge at the concave part of the V-shaped teeth, and a main cutting edge between the tip and the concave part. The height of the rake face of the cutting edge is lower than that of the upper surface. The rake face and the upper surface are connected by an inclined surface. The inclined surface is an inverted conical surface at the concave rounded cutting edge, a uniformly distributed conical surface at the main cutting edge, and a stepped inclined surface at the pointed rounded cutting edge.
[0006] Multiple V-shaped teeth are arranged in a continuous manner, with their two ends extending in the opposite direction to the tip to form a stepped cutting edge.
[0007] The rake face of a pointed rounded cutting edge is called the pointed rake face, and the rake face of a concave rounded cutting edge is called the concave rake face; both are curved surfaces.
[0008] The angle between the tip rake face and the upper surface is θ1, and the angle between the concave rake face and the upper surface is θ2, where θ2 > θ1.
[0009] Preferably, the angle range of θ1 is 6° to 7°; the angle range of θ2 is 8° to 10°.
[0010] The inclined surface at the tip of the rounded cutting edge includes a tooth tip platform, which is a plane and parallel to the upper surface. The height of the tooth tip platform is higher than the tip of the rounded cutting edge and lower than the upper surface.
[0011] The height difference between the tooth tip and the upper surface is H1, and the height difference between the tooth tip and the rounded cutting edge is H2. The two satisfy H2=aH1, where a ranges from 0.6 to 2.5.
[0012] The length of the tip rake face from the tip to the center of the blade is W2, and the width in the direction perpendicular to the aforementioned length is W1. The two satisfy W2 = bW1, where the ratio b ranges from 0.2 to 5.0.
[0013] The tip rake face and the tooth tip are connected by a surface with a large inclination angle. The angle between this surface and the upper surface is θ3, where 30°≤θ3≤60°.
[0014] Furthermore, a U-shaped fixing groove is provided at the center of the upper surface, with inclined walls, a small bottom, and a large opening.
[0015] Furthermore, the lower part of the blade has the same structure as the upper part of the blade, that is, the upper and lower parts of the blade are flipped symmetrically, and the V-shaped teeth on the two narrow sides of the same side surface are also symmetrical to each other.
[0016] This utility model also provides a cutting tool, including the above-mentioned cutting blade, tool holder, pressure block, and fastening screw, wherein the pressure block and the head of the tool holder are provided with mutually cooperating screw holes, and the fastening screw can press the pressure block tightly onto the cutting blade through the screw holes.
[0017] The tool holder has a blade groove with an opening at the top at one end. One end of the blade groove is the head of the tool holder, which is the proximal end, and the other end is the distal end. The cutting blade is installed at an angle in the blade groove, and the height of the proximal end is lower than the height of the distal end.
[0018] The pressure block includes a first pressure tongue and a second pressure tongue. When the second pressure tongue is inserted into the hole provided with the knife bar, the first pressure tongue is tightly attached to the U-shaped fixing groove. The contact surface between the first pressure tongue and the U-shaped fixing groove is a sloped surface.
[0019] The advantages of this application compared to the prior art are:
[0020] 1. From the top view, the blade is a quadrilateral that is wider in the middle and narrower on both sides. The cutting edge is located on the two narrow sides, and the middle of the blade is wider. This design can ensure the overall rigidity and stability of the blade.
[0021] 2. The insert is equipped with multiple continuous V-shaped teeth, and the cutting edge is formed at the end of the side surface of the V-shaped teeth. This can greatly increase the length of the cutting edge, disperse the cutting force, and improve the cutting efficiency.
[0022] 3. The gaps between the V-shaped teeth allow the chips generated during the cutting process to be easily curled, cut, and discharged.
[0023] 4. The front face and the upper surface are connected by an inclined surface, which includes multiple inverted conical surfaces, conical surfaces and stepped inclined surfaces. This can guide the flow of chips, allowing the chips to be discharged faster along the direction of the inclined surface, effectively preventing chip clogging. Attached Figure Description
[0024] Figure 1 This is a three-dimensional structural diagram of a multi-tooth cutting tool.
[0025] Figure 2 This is a front view of a multi-tooth cutting tool (area A is the perspective portion).
[0026] Figure 3 for Figure 2 A magnified view of a portion of region B in the middle.
[0027] Figure 4 This is a three-dimensional structural diagram of a multi-tooth cutting insert.
[0028] Figure 5 for Figure 4 A magnified view of a portion of region C.
[0029] Figure 6 This is a top view of a multi-tooth cutting insert.
[0030] Figure 7 for Figure 6 Cross-sectional view of the PP line.
[0031] Figure 8 for Figure 7 A magnified view of a portion of region E in the middle.
[0032] Figure 9 for Figure 7 A magnified view of a portion of region D.
[0033] Attached image captions:
[0034] 1. Cutting insert; 2. Tool holder; 3. Clamping block; 4. Fastening screw; 301. First clamping tongue; 302. Second clamping tongue; 101. Upper surface; 102. Lower surface; 103. U-shaped retaining groove; 11. V-shaped tooth; 111. Main cutting edge; 112. Rounded tip cutting edge; 113. Rounded concave tip cutting edge; 114. Stepped edge; 115. Inclined surface; 116. Tooth tip platform; 117. Conical surface; 118. Tip rake face; 119. Concave rake face; Detailed Implementation
[0035] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.
[0036] As an example, this application provides a cutting tool, such as Figure 1 As shown, it includes:
[0037] Cutting insert 1, tool holder 2, clamping block 3, fastening screw 4, in the installed state, such as Figure 2 As shown, the cutting insert 1 is obliquely fixed in the insert groove at one end of the tool holder 2. The cutting insert 1 includes an upper surface and a lower surface, and both the upper and lower surfaces have U-shaped fixing grooves 103 at their middle positions. Figure 2 As shown, the pressure block 3 has two protruding pressure tongues below it. The second pressure tongue 302 is inserted into the fixing hole in the tool holder. At this time, the protruding position of the first pressure tongue 301 can just match the U-shaped groove on the upper surface of the cutting blade. The pressure block 3 plays the role of connecting the cutting blade 1 and the end of the tool holder 2.
[0038] The pressure tongue 3 also includes a through hole. In the installed state, this through hole matches the screw hole on the head of the tool holder 2. The fastening screw passes through the through hole of the pressure tongue and is fixed in the screw hole on the head of the tool holder 2, thus firmly fixing the pressure tongue 2 to the fixed position on the head of the tool holder. Figure 3 As shown, the contact point between the first pressure tongue 301 and the U-shaped fixing groove 103 is an inclined surface. When the pressure block is pressed down, the inclined part of the first pressure tongue 301 also slides down and is pressed down due to the pressure, thereby realizing the positioning and fixing of the cutting blade 1.
[0039] The cutting blade 1 is in the shape of a quadrilateral platform, including an upper surface 101, a lower surface 102, and a side surface connecting the upper and lower surfaces. The side surface is perpendicular to the upper and lower surfaces 101 and 102. The upper and lower surfaces have the same structure and each has a U-shaped fixing groove 103 in the center for positioning and locking.
[0040] like Figure 3 , Figure 4 As shown, two sets of identical cutting edges are formed on the two opposite sides of the upper surface 101, that is, the upper surface 101 of the cutting tool is rotationally symmetrical. Since the upper and lower surfaces have the same structure, the cutting tool has a total of four sets of identical cutting edges.
[0041] From the perspective of a single set of cutting edges, such as Figure 2 , Figure 3 As shown, the edge where the cutting edge is located has multiple continuous V-shaped teeth 11. In this embodiment, the number of V-shaped teeth 11 is three.
[0042] A cutting edge is formed on the side surface end of the V-tooth portion 11. The cutting edge consists of several parts, including a pointed rounded cutting edge 112 at the tip of the V-tooth portion 11, a concave rounded cutting edge 113 at the concave part of the V-tooth portion 11, and a main cutting edge 111 located between the tip and the concave part, forming the straight portion of the V-tooth portion 11. The two ends of the V-tooth portion 11 terminate at the concave part, and the concave parts at both ends extend into stepped cutting edges in the opposite direction to the tooth tip. The aforementioned pointed rounded cutting edge 112, concave rounded cutting edge 113, main cutting edge 111, and stepped cutting edge 114 together constitute a complete set of cutting edges.
[0043] The rake face of the cutting edge is lower than the upper surface 101 in height. The rake face and the upper surface 101 are connected by an inclined surface 115 with a slope. The inclined surface 115 has different shapes at different positions of the cutting edge. The inclined surface at the concave part of the V tooth 11 is an inverted conical surface with a large radius of curvature, and the inclined surface at the tip is stepped. It includes a flat platform tooth tip 116 that is higher than the rake face but lower than the upper surface 101. The tooth tip 116 is parallel to the upper surface 101. The inclined surface between the concave part and the tip is a uniformly distributed and slightly spaced conical surface 117.
[0044] In particular, such as Figure 8 As shown, the height difference between the rounded cutting edge 112 and the upper surface 101 is H1, and the height difference between the tooth tip 116 and the upper surface 101 is H2. The ratio between the two is H2 = aH1, where a ranges from 0.6 to 2.5. This arrangement can ensure the strength of the V-shaped tooth while achieving effective chip breaking.
[0045] The inclined surface design provides sufficient space for chip curling and removal, effectively preventing chip accumulation and clogging. In particular, the tooth tip 116 acts as a chip breaker and guide during small feed cutting, and prevents chip clogging during large feed cutting. The conical surface causes chips to curl and break as they pass through, and also guides them into the gap between the two conical surfaces. When the workpiece rotates, the airflow generated flows through the inclined surface 115 at the main cutting edge, causing the chips to be accelerated out along the gap between the conical surfaces.
[0046] like Figure 8 , Figure 9 As shown, the rake face of the pointed rounded cutting edge 112 is the pointed rake face 118, and the angle between the pointed rake face 118 and the upper surface 101 (i.e., the rake angle of the pointed rounded cutting edge) is θ1, the angle range of θ1 is 6° to 7°, preferably θ1 is 6.8°; the rake face of the concave rounded cutting edge 113 is the concave rake face 119, and the angle between the concave rake face 119 and the upper surface 101 is θ2, the angle range of θ2 is 8° to 10°, preferably θ2 is 8.9°, θ2 > θ1.
[0047] Because the cutting edge of the insert is toothed, chips easily accumulate in the recess of the V-tooth section and are difficult to remove, which affects machining efficiency and causes wear on the insert. The rounded corner cutting edge 113 in the recess has a large rake angle, which is beneficial for chip breaking and chip removal in the recess of the V-tooth section. It can effectively prevent chip removal from being blocked at the rounded corner cutting edge, improve machining efficiency, and extend the service life of the insert.
[0048] Both the pointed rake face 118 and the concave rake face 119 are curved, which can guide the flow of chips during machining and have a large chip space to prevent chip accumulation and clogging.
[0049] like Figure 6 As shown in the top view, the length of the tip rake face 118 from the tip to the center of the insert is W2, and the length in the vertical direction is W1. The ratio of W1 to W2 conforms to W2 = bW1, where the ratio b ranges from 0.2 to 5.0. When the length ratio is within this range, the flow of chips can be better controlled, and the deformation of the cutting edge and the cutting force can be reduced. If the length is too large, it will affect the rigidity of the tool tip; if the width is too large, it will easily cause vibration, affecting the machining effect.
[0050] like Figure 9 As shown, the tip rake face 118 and the tooth tip platform 116 are connected by a surface with a large inclination angle. The angle between this surface and the upper surface 101 is θ3, where 30°≤θ3≤60°.
[0051] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.
Claims
1. A multi-tooth cutting insert, characterized in that, include: The device comprises an upper surface, a lower surface, and peripheral side surfaces, wherein the upper surface and the side surfaces are perpendicular to each other. The upper surface is roughly a quadrilateral that is wider in the middle and narrower at both sides. Multiple identical and continuous V-shaped teeth are arranged on the narrow sides. The ends of the side surfaces at the V-shaped teeth form cutting edges, including a pointed rounded cutting edge at the tip of the V-shaped teeth, a concave rounded cutting edge at the concave part of the V-shaped teeth, and a main cutting edge between the tip and the concave part. The height of the rake face of the cutting edge is lower than that of the upper surface. The rake face and the upper surface are connected by an inclined surface. The inclined surface is an inverted conical surface at the concave rounded cutting edge, a uniformly distributed conical surface at the main cutting edge, and a stepped inclined surface at the pointed rounded cutting edge.
2. The multi-tooth cutting insert as described in claim 1, characterized in that: Multiple V-shaped teeth are arranged in a continuous manner, with their two ends extending in the opposite direction to the tip to form a stepped cutting edge.
3. A multi-tooth cutting insert as described in claim 2, characterized in that: The rake face of a pointed rounded cutting edge is called the pointed rake face, and the rake face of a concave rounded cutting edge is called the concave rake face; both are curved surfaces.
4. A multi-tooth cutting insert as described in claim 3, characterized in that: The angle between the tip rake face and the upper surface is θ1, and the angle between the concave rake face and the upper surface is θ2, where θ2 > θ1.
5. A multi-tooth cutting insert as described in claim 4, characterized in that: The angle range of θ1 is 6° to 7°.
6. A multi-tooth cutting insert as described in claim 4, characterized in that: The angle range of θ2 is 8° to 10°.
7. A multi-tooth cutting insert as described in claim 4, characterized in that: The inclined surface at the tip of the rounded cutting edge includes a tooth tip platform, which is a plane and parallel to the upper surface. The height of the tooth tip platform is higher than the tip of the rounded cutting edge and lower than the upper surface.
8. A multi-tooth cutting insert as described in claim 7, characterized in that: The height difference between the tooth tip and the upper surface is H1, and the height difference between the tooth tip and the rounded cutting edge is H2. The two satisfy H2=aH1, where a ranges from 0.6 to 2.
5.
9. A multi-tooth cutting insert as described in claim 7, characterized in that: The length of the tip rake face from the tip to the center of the blade is W2, and the width in the direction perpendicular to the aforementioned length is W1. The two satisfy W2 = bW1, where the ratio b ranges from 0.2 to 5.
0.
10. A multi-tooth cutting insert as described in claim 9, characterized in that: A U-shaped fixing groove is provided at the center of the upper surface. The groove wall is inclined, the bottom of the groove is small, and the opening of the groove is large.
11. A multi-tooth cutting insert as described in claim 10, characterized in that: The lower part of the blade has the same structure as the upper part of the blade.
12. A cutting tool, characterized in that: Includes the multi-tooth cutting insert as described in any one of claims 1-11.
13. A cutting tool as described in claim 12, characterized in that: It also includes a tool holder, a pressure block, and a fastening screw, wherein the pressure block and the head of the tool holder are provided with matching screw holes, and the fastening screw can press the pressure block tightly onto the cutting blade through the screw holes.
14. A cutting tool as described in claim 13, characterized in that: The tool holder has a blade groove with an opening at the top at one end. One end of the blade groove is the head of the tool holder, which is the proximal end, and the other end is the distal end. The cutting blade is installed at an angle in the blade groove, and the height of the proximal end is lower than the height of the distal end.
15. A cutting tool as described in claim 13, characterized in that: The pressure block includes a first pressure tongue and a second pressure tongue. When the second pressure tongue is inserted into the hole provided with the knife bar, the first pressure tongue is tightly attached to the U-shaped fixing groove. The contact surface between the first pressure tongue and the U-shaped fixing groove is a sloped surface.