Indexable cutting tool

Abstract

The utility model provides an indexable cutting tool which comprises an upper surface and a lower surface which are oppositely arranged, and the upper surface is similar to a triangle or a convex triangle; a major side extending between the upper surface and the lower surface; a main cutting edge formed by intersecting the upper surface and the side surface; the upper surface comprises a chip breaker groove extending along the main cutting edge, a supporting base face and at least three protruding blocks protruding relative to the supporting base face. The outer side wall of the chip breaker groove is connected with the main cutting edge, and an included angle of 10-25 degrees is formed between the outer side wall of the chip breaker groove and the supporting base plane; the inner side wall of the chip breaker groove is connected with the supporting base face and / or the protruding block, and an included angle of 20-60 degrees is formed between the inner side wall of the chip breaker groove and the supporting base face. The at least three convex blocks are triangularly arranged, and the top surfaces of the convex blocks are flat surfaces and are positioned on the same plane. According to the cutting blade, a stable plane can be determined through the three protruding blocks, the manufacturing and positioning effects can be achieved without conducting large-area grinding on the supporting base face after the sintering procedure, the raw material cost can be effectively saved, and the manufacturing process is simplified.

Description

Technical Field

[0001] The invention relates to a cutting tool, in particular to an indexable cutting tool. Background Art

[0002] Carbide coated blades are made of refractory metal carbides and metal binders through powder metallurgy. The manufacturing process includes powder making, pressing, sintering, grinding, coating, etc. The basic shape of the cutting blade is obtained by pressing, and then the required hardness is achieved through a sintering process. The surface of the cutting blade is then ground. The grinding is because sintering itself will cause convex deformation of the blade surface. Grinding can obtain a flat supporting surface or positioning surface, so that the contact between the cutting blade and the tool holder is more closely fitted during installation, and it can be more firmly installed on the tool holder, so that the metal processing process remains stable, the service life of the tool is increased, and the tool cost is reduced.

[0003] Therefore, the production process of cemented carbide coated blades usually includes the grinding process. When making the blank, a margin will be reserved on the upper and lower sides of the blade for use in the grinding process. If the blade can be stably installed without reserving a grinding margin, the raw material cost and production cost can be effectively reduced. Summary of the invention

[0004] Based on this, the utility model aims to overcome the defects of the prior art and to provide an indexable cutting tool which does not require any allowance when cutting the blank and does not require any grinding.

[0005] An indexable cutting tool, comprising:

[0006] An upper surface and a lower surface are arranged opposite to each other, wherein the upper surface is approximately a triangle or an approximately convex triangle;

[0007] a major side extending between the upper and lower surfaces;

[0008] A main cutting edge formed by the intersection of the upper surface and the side surface;

[0009] Wherein, the upper surface includes a chip breaker groove extending along the cutting edge, a supporting base surface and at least three protrusions raised relative to the supporting base surface; the outer wall of the chip breaker groove is connected to the main cutting edge and forms an angle of 10°-25° with the supporting base surface; the inner wall of the chip breaker groove is connected to the supporting base surface and / or the protrusion, and forms an angle of 20°-60° with the supporting base surface; at least three of the protrusions are arranged in a triangle, and their top surfaces are all flat surfaces and are located in the same plane.

[0010] Furthermore, the upper surface is rotationally symmetric to the lower surface.

[0011] Furthermore, the cross section of the chip breaker groove is substantially U-shaped or V-shaped.

[0012] Furthermore, the area of ​​the top surface of the bump is s, 1mm 2 ≤s≤10mm 2 ; The height of the protrusion relative to the supporting base is h, 0.03mm≤h≤0.5mm.

[0013] Furthermore, a height of a top surface of the projection relative to the main cutting edge is L, and 0.1 mm ≤ L ≤ 0.3 mm.

[0014] Furthermore, adjacent main side surfaces are connected by arc side surfaces, and the arc side surfaces intersect with the upper surface to form a tool tip cutting edge.

[0015] Furthermore, the angle between adjacent main side surfaces is α, 55°≤α≤85°.

[0016] Furthermore, the radius of the inscribed circle of the upper surface is D, 6mm≤D≤19.5mm.

[0017] The advantages of this application compared to the prior art are:

[0018] 1. In the prior art process of manufacturing cutting blades, after the blades are sintered and hardened, it is necessary to grind the blade surface to obtain a support surface or a positioning surface. Therefore, a margin must be reserved in advance during manufacturing for subsequent grinding steps. The utility model provides a plurality of protrusions and arranges the protrusions in a triangular shape. Three small-area protrusions can be used to complete the support and positioning functions without the need to grind a large area of ​​the blade surface. This can effectively save raw material costs and streamline the manufacturing process of cutting blades.

[0019] 2. The utility model provides an indexable cutting blade, the upper and lower surfaces have the same structure, and the overall shape is a triangle. The three sides and three vertices intersect with the side surfaces to form three groups of cutting edges. When one group of cutting edges is worn out, it can be replaced by a new group of cutting edges, which can save time in replacing the blades and improve the utilization rate of a single cutting blade.

[0020] 3. The side surface of the cutting blade constitutes the back surface of the cutting edge and can also play a fixing role when the blade is installed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional schematic diagram of a first embodiment of an indexable cutting insert;

[0022] Figure 2 A top view of a first embodiment of an indexable cutting insert;

[0023] Figure 3 MM cross-sectional view of a first embodiment of an indexable cutting insert;

[0024] Figure 4 It is a three-dimensional schematic diagram of a second embodiment of an indexable cutting insert.

[0025] Among them: 1. upper surface; 2. lower surface; 3. main side surface; 4. fastening hole; 5. arc side surface; 6. main cutting edge; 7. tip cutting edge; 8. chip breaker groove; 9. support base surface; 10. bump. DETAILED DESCRIPTION

[0026] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0027] The present application embodiment provides an indexable cutting tool, such as Figure 1-4 As shown, it includes: an upper surface 1 and a lower surface 2 arranged opposite to each other, a main side surface 3 connecting the upper surface and the lower surface, an arc side surface 5, a fastening hole 4, a main cutting edge 6, and a tip cutting edge 7.

[0028] The upper surface 1 intersects with the main side surface 3 to form a main cutting edge.

[0029] The upper surface 1 includes a chip breaker 8 extending along the main cutting edge 6, a support base surface 9, and at least three protrusions 10 protruding relative to the support base surface 9; the outer wall of the chip breaker 8 is connected to the main cutting edge 6 and forms an angle of 10°-25° with the support base surface 9; the inner wall of the chip breaker 8 is connected to the support base surface and / or the protrusion, and forms an angle of 20°-60° with the support base surface 9; at least three protrusions 10 are arranged in a triangular shape, and their top surfaces are all flat surfaces and located in the same plane. The triangular arrangement means that the connecting lines between the three protrusions 10 form a triangle, the top surfaces of the protrusions 10 are all flat surfaces, and they are all located in or included in the same plane.

[0030] This embodiment provides a plurality of bumps and arranges the bumps in a triangle, so that three small-area bumps can be used to complete the support and positioning functions without the need for large-area grinding of the blade surface, which can effectively save raw material costs and streamline the manufacturing process of the cutting blade.

[0031] The chip is first cut off by the cutting edge, flows through the rake face of the chip breaker groove, that is, the outer wall of the chip breaker groove, then reaches the bottom of the groove, and then reaches the inner wall of the chip breaker groove to be bent and finally broken.

[0032] As an example

[0033] The main side surface 3 is mainly connected to the three sides of the upper surface 1 of the triangle, and the arc side surface 5 is mainly connected to the three vertices of the upper surface 1 of the triangle.

[0034] Adjacent main side surfaces 3 are connected by arc side surfaces 5 , and the arc side surfaces 5 intersect with the upper surface 1 to form a tool tip cutting edge 7 .

[0035] The upper surface 1 is approximately triangular, and its main side surface is a plane.

[0036] The upper surface 1 is approximately a convex triangle. Here, a convex triangle is similar to Figure 4 The shape of the middle upper surface 1 is such that its main side surface 3 is formed by connecting two planes with obtuse angles, namely, plane 3a and plane 3b, so that the upper surface 1 roughly presents a basically triangular shape with the middle part of the side slightly convex outward, and the obtuse angle is between 150°-170°.

[0037] The upper surface 1 and the lower surface 2 are rotationally symmetrical, so that the lower surface 2 has the same shape and structure as the upper surface 1, including a chip breaker groove 8 extending along the main cutting edge 6, a supporting base surface 9 and at least three protrusions 10 protruding relative to the supporting base surface 9, and a main cutting edge 6 and a tip cutting edge 7 formed by the intersection with the main side surface 3 and the arc side surface 5.

[0038] like Figure 2 As shown, the radius of the inscribed circle of the upper surface is D, 6mm≤D≤19.5mm.

[0039] The included angle between adjacent main side surfaces 3 is α, 55°≤α≤85°.

[0040] The fastening hole 4 is a through hole that passes through the upper surface 1 and the lower surface 2 and is used to fix the cutting blade in the blade groove. The diameter of the fastening hole 4 is d, 2mm≤d≤8mm.

[0041] The chip breaker groove 8 is arranged along the outer periphery of the upper surface 1. Figure 3 As shown, the chip breaker groove 8 is U-shaped or V-shaped.

[0042] As an example

[0043] The area of ​​the top surface of the bump 10 is s, 1mm 2 ≤s≤10mm 2 The height of the bump 10 relative to the supporting base surface 9 is h, 0.03mm≤h≤0.5mm.

[0044] The height of the top surface of the projection relative to the main cutting edge is L, 0.1 mm ≤ L ≤ 0.3 mm.

[0045] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An indexable cutting tool, characterized in that: include: An upper surface and a lower surface are arranged opposite to each other, wherein the upper surface is approximately a triangle or an approximately convex triangle; a major side extending between the upper and lower surfaces; A main cutting edge formed by the intersection of the upper surface and the side surface; Wherein, the upper surface includes a chip breaker groove extending along the main cutting edge, a supporting base surface and at least three protrusions protruding relative to the supporting base surface; the outer wall of the chip breaker groove is connected to the main cutting edge and forms an angle of 10°-25° with the supporting base surface; the inner wall of the chip breaker groove is connected to the supporting base surface and / or the protrusion, and forms an angle of 20°-60° with the supporting base surface; at least three of the protrusions are arranged in a triangle, and their top surfaces are all flat surfaces and are located in the same plane.

2. An indexable cutting tool according to claim 1, characterized in that: The upper surface is rotationally symmetrical to the lower surface.

3. An indexable cutting tool according to claim 1 or 2, characterized in that: The cross section of the chip breaker groove is substantially U-shaped or V-shaped.

4. An indexable cutting tool according to claim 1 or 2, characterized in that: The area of ​​the top surface of the bump is s, 1mm 2 ≤s≤10mm 2 ; The height of the protrusion relative to the supporting base is h, 0.03mm≤h≤0.5mm.

5. An indexable cutting tool according to claim 4, characterized in that: The height of the top surface of the projection relative to the main cutting edge is L, and 0.1 mm≤L≤0.3 mm.

6. An indexable cutting tool according to claim 1 or 2, characterized in that: Adjacent main side surfaces are connected by arc side surfaces, and the arc side surfaces intersect with the upper surface to form a tool tip cutting edge.

7. An indexable cutting tool according to claim 1 or 2, characterized in that: The included angle between adjacent main side surfaces is α, 55°≤α≤85°.

8. An indexable cutting tool according to claim 1 or 2, characterized in that: The radius of the inscribed circle of the upper surface is D, 6mm≤D≤19.5mm.

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