Titanium alloy finishing cutting blade

Abstract

The present invention discloses a titanium alloy finishing cutting blade, comprising a blade body and a cutting unit arranged on the blade body, wherein the cutting unit comprises an arc edge, a cutting edge and a chip breaker. The cutting edge is composed of a straight line segment, an arc segment one and an arc segment two, and the chip breaker is composed of an arc edge, a rake face, a transition arc face, a chip breaker platform and a protrusion connected in sequence. The connection line of the three sections on the cutting edge adjacent to the arc edge divides the rake face into rake face one, rake face two and rake face three. The present invention adopts a straight line and two arc segments to form the cutting edge, and the formed blade inclination angle not only ensures the sharpness of the blade, reduces the generation of built-up edge and work hardening phenomenon in titanium alloy processing, but also ensures that the chips flow to the unprocessed surface, thereby ensuring the surface finish of the processed part and avoiding the problem of the surface finish of the processed part being damaged by chips.

Description

Technical Field

[0001] The invention relates to the technical field of cemented carbide inserts, and more specifically, to a titanium alloy finishing cutting insert. Background Art

[0002] Titanium alloy has the advantages of high strength and low density, and is widely used in the aerospace field. Titanium alloy has the advantages of high strength and low density, which makes titanium alloy tough, corrosion-resistant and heat-resistant, thus bringing difficulties to its processing.

[0003] CN201621375658.1 discloses a polygonal double-sided indexable cutting blade, which includes a blade body having a polygon, a blade positioning hole located at its geometric center, and an upper end face, a lower end face, at least three side faces, and an arc surface connecting the side faces. The highest plane protruding from the periphery of the blade positioning hole of the upper end face or the lower end face is a flat support surface. The upper end face and the lower end face both have three vertex angles, and each vertex angle is provided with a cutting unit, and the cutting unit includes an arc cutting edge, a cutting edge, and a chip breaker groove. The cutting blade takes into account both the sharpness and strength of the cutting edge, as well as the design of a large chip holding space and a double chip breaker, which is conducive to guiding, curling, and breaking the chips well at both large cutting depth and large feed and small cutting depth and small feed. Although the cutting blade has both cutting edge sharpness and cutting edge strength, due to the high strength of titanium alloy, this type of indexable cutting blade has a short processing life when processing titanium alloy, and the finish of the processed workpiece is not high, which cannot meet the processing requirements of titanium alloy. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a titanium alloy finishing cutting blade in view of the shortcomings of the existing cutting blades in processing titanium alloys, such as poor wear resistance and short service life, and low surface finish of the processed parts.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A titanium alloy finishing cutting blade comprises a blade body, wherein the blade body comprises an upper surface, a lower surface and a plurality of side surfaces for connecting the upper surface and the lower surface, adjacent side surfaces are connected by arc surfaces, a positioning center hole is provided at the geometric center of the blade body, a cutting unit is arranged at the top corner of the blade body, and the cutting unit comprises an arc edge, a cutting edge and a chip breaker groove.

[0007] The arc blade is formed by the intersection of an arc surface and an upper surface or a lower surface, and the cutting edge is formed by the intersection of a side surface and an upper surface or a lower surface. The cutting edge is composed of three sections, namely a straight line segment, an arc segment one and an arc segment two. The cutting edge is composed of a straight line segment and two arc segments. The formed blade inclination angle enables the cutting edge to start cutting from the highest point of the tool tip. The chips extend counterclockwise and flow along the angle formed by the root of the cutting edge and the transition surface of the workpiece, thereby determining that the chip flow can only extend to the surface to be processed of the workpiece, which not only ensures the sharpness of the blade, but also ensures that the chips flow to the unprocessed surface, thereby ensuring the surface finish of the processed parts.

[0008] The chip breaker groove is composed of an arc edge, a front cutting edge, a transition arc surface, a chip breaker platform and a protrusion connected in sequence. The three-segment connection line on the cutting edge adjacent to the arc edge divides the front cutting edge into front cutting edge one, front cutting edge two and front cutting edge three. The front cutting edge is smoothly connected by three planes, which not only enhances the strength of the cutting edge, but also is more conducive to guiding the chips to curl, break and discharge smoothly toward the protrusion.

[0009] Furthermore, the blade body is a polygonal body, and at least one cutting unit is arranged on it.

[0010] Preferably, cutting units are provided at the top corners of the polygonal blade body.

[0011] Furthermore, a rake angle δ formed between the straight section of the cutting edge and the surface along a direction perpendicular to the side surface is 5° to 16°.

[0012] Preferably, a rake angle δ formed by the straight section of the cutting edge along a direction perpendicular to the side surface and the surface is 10°.

[0013] Furthermore, a rake angle ε formed between the arc segment 1 of the cutting edge and the surface along a direction perpendicular to the side surface is 5° to 16°.

[0014] Preferably, a rake angle ε formed by the arc segment of the cutting edge along a direction perpendicular to the side surface and the surface is 10°.

[0015] Furthermore, a rake angle θ formed by the arc segment 2 of the cutting edge and the surface along a direction perpendicular to the side surface is 5° to 16°.

[0016] Preferably, the rake angle θ formed by the arc segment 2 of the cutting edge and the surface along the direction perpendicular to the side surface is 10°.

[0017] Furthermore, the rake angle δ, the rake angle ε and the rake angle θ of the cutting edge are all equal.

[0018] Furthermore, the rake angle ρ formed by the straight line segment of the cutting edge and the projected straight line on the surface is 0° to 20°. The size of the rake angle affects the strength of the blade tip and the smoothness of cutting. An appropriate positive rake angle makes the cutting edge sharp and can cut small and thin metal layers. If the rake angle is too large, the blade tip strength is low and the wear resistance of the blade deteriorates; if the rake angle is too small or even negative, the blade tip strength is high and the cutting is smooth, but the cutting edge is not sharp, resulting in poor surface finish of the workpiece. Preferably, the rake angle ρ formed by the straight line segment of the cutting edge and the projected straight line on the surface is 8°.

[0019] Furthermore, the radius R1 of the arc segment 1 of the cutting edge is 10 mm to 50 mm.

[0020] Preferably, the radius R1 of the arc segment of the cutting edge is 35 mm.

[0021] Furthermore, the radius R2 of the arc segment 2 of the cutting edge is 10 mm to 50 mm. Preferably, the radius R2 of the arc segment of the cutting edge is 25 mm.

[0022] Furthermore, a rake angle α formed by the rake face along the angle bisector and the surface ranges from 5° to 20°.

[0023] Furthermore, the rake angle β formed by the second rake face along the angle bisector and the surface is in the range of 5° to 20°.

[0024] Furthermore, a rake angle γ formed by the rake face along the angle bisector and the surface ranges from 5° to 20°.

[0025] The increase of rake face angle makes the cutting edge sharper, the chip outflow resistance is small, the friction is small, and the cutting deformation is small, so the cutting force and cutting power are small, the cutting temperature is low, the tool wear is small, and the surface quality of the machined surface is high. However, too large rake angle makes the tool rigid and strong poor, the heat is not easy to dissipate, the tool wear and damage are serious, and the tool life is short.

[0026] Preferably, the rake angle α formed by the first rake face and the surface along the angle bisector is in the range of 10°, the rake angle β formed by the second rake face and the surface along the angle bisector is in the range of 10°, and the rake angle γ formed by the third rake face and the surface along the angle bisector is in the range of 10°.

[0027] Furthermore, the rake angles α, β and γ of the first rake face, the second rake face and the third rake face are all equal.

[0028] Furthermore, the protrusion is in the shape of a "water drop" with one side protruding and extending, and the extension of the water drop shape points to the top corner of the blade body. The water drop shape can have a good curling and breaking effect on the chips, thereby effectively breaking the chips.

[0029] Furthermore, the distance L from the center of the protrusion to the arc edge along the angle bisector is 1 mm to 4.5 mm.

[0030] Preferably, the distance L from the center of the protrusion to the arc edge along the angle bisector is 3.2 mm.

[0031] Compared with the prior art, the beneficial effects are:

[0032] The cutting blade of the present invention uses a straight line and two arcs to form the cutting edge. The formed blade inclination angle not only ensures the sharpness of the blade, reduces the generation of built-up edge and work hardening in titanium alloy processing, but also ensures that the chips flow to the unprocessed surface, thereby ensuring the surface finish of the processed parts. At the same time, the front cutting surface is smoothly connected by three planes, which not only strengthens the strength of the cutting edge, but also improves the life of the blade. It is more conducive to guiding the chips to curl and break toward the protrusion, and provides a larger chip space, fully ensuring the smooth discharge of the chips, and avoiding the surface finish of the processed part being damaged by the chips. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A three-dimensional diagram of a titanium alloy finishing cutting blade in Embodiment 1;

[0034] Figure 2 It is a partial enlarged view of the cutting unit A;

[0035] Figure 3 This is a front view of a titanium alloy finishing cutting blade in this embodiment 1;

[0036] Figure 4 for Figure 3 A cross-sectional view of the blade shown along line UU;

[0037] Figure 5 for Figure 3 A projection view of the blade shown along the vertical side 4;

[0038] Figure 6 for Figure 3 A cross-sectional view of the blade shown along line XX;

[0039] Figure 7 for Figure 3 A cross-sectional view of the blade shown along line VV;

[0040] Figure 8 for Figure 3 The insert is shown in cross-section along line WW.

[0041] Among them, 1 is a blade body, 2 is an upper surface, 3 is a lower surface, 4 is a side surface, 5 is an arc surface, 6 is a cutting edge, 61 is a straight line segment, 62 is an arc segment one, 63 is an arc segment two, 7 is an arc edge, 8 is a front cutting surface one, 9 is a front cutting surface two, 10 is a transition arc surface, 11 is a front cutting surface three, 12 is a chip breaker, 13 is a protrusion, 14 is a chip breaker groove, 15 is an edge inclination angle, 16 is a positioning center hole, and 17 is a chip groove. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] It should be noted that if there are directional indications (such as up, down, left, right, front, and back) in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly. If there are descriptions of "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0046] Example 1

[0047] The present embodiment provides a titanium alloy finishing cutting blade, which includes a blade body 11 and a cutting unit arranged at the top corner of the blade body 11. The blade body 1 includes an upper surface 2, a lower surface 3, a plurality of side surfaces 4, and an arc surface 5 located between two adjacent side surfaces 4, and a positioning center hole 16 is provided at the geometric center of the blade body 1.

[0048] The cutting unit is composed of a circular arc edge 7, a cutting edge 6, and a chip breaker 14, and the cutting unit is symmetrically distributed about the angle bisector P. The circular arc edge 7 is formed by the intersection of the circular arc surface 5 and the upper surface 2, the cutting edge 6 is formed by the intersection of the side surface 4 and the upper surface 2, and the chip breaker 14 is composed of a rake face, a chip groove 17, a chip breaker platform 12 and a protrusion 13.

[0049] The cutting edge 6 is composed of three sections, namely, a straight line segment 61, an arc segment 1 62 and an arc segment 2 63, from the arc vertex of the blade body 1. The rake face of the chip breaker groove 14 is divided into a rake face 1 8, a rake face 2 9 and a rake face 3 11 by connecting the three sections of the straight line segment 61, the arc segment 1 62 and the arc segment 2 63 on the cutting edge 6 adjacent to the arc edge 7. Along the angle bisector P from the arc edge 7 to the direction of the positioning center hole 16, the chip breaker groove 14 is connected in the order of the arc edge 7, the rake face 1 8, the rake face 2 9, the rake face 3 11, the transition arc surface 10, the chip breaker platform 12 and the protrusion 13.

[0050] The protrusion 13 is in the shape of a “water drop” with one side protruding and extending, and the extended portion of the water drop shape points to the top corner of the blade body 1 .

[0051] Example 2

[0052] This embodiment provides a titanium alloy finishing cutting blade, such as Figure 1 The titanium alloy finishing cutting blade includes a blade body 11 and a cutting unit arranged at the top corner of the blade body 11. The blade body 1 is a polygonal body, and cutting units are arranged at the three top corners. The blade body 1 includes an upper surface 2, a lower surface 3, a plurality of side surfaces 4, and an arc surface 5 located between two adjacent side surfaces 4. A positioning center hole 16 is arranged at the geometric center of the blade body 1.

[0053] like Figure 2 The cutting unit is composed of a circular arc edge 7, a cutting edge 6, and a chip breaker 14, and the cutting unit is symmetrically distributed about the angle bisector P. The circular arc edge 7 is formed by the intersection of the circular arc surface 5 and the upper surface 2, the cutting edge 6 is formed by the intersection of the side surface 4 and the upper surface 2, and the chip breaker 14 is composed of a rake face, a chip groove 17, a chip breaker platform 12 and a protrusion 13.

[0054] The cutting edge 6 is composed of three sections, namely, a straight line section 61, a circular arc section 1 62 and a circular arc section 2 63, from the circular arc vertex of the blade body 1. Figure 5-8 , the rake angle δ formed by the straight segment 61 of the cutting edge 6 and the upper surface 2 along the vertical side direction is 5° to 16°, and the blade inclination angle ρ formed by the straight segment 61 and the projected straight line on the surface is 0° to 20°. The rake angle ε formed by the arc segment 1 62 of the cutting edge 6 and the upper surface 2 along the vertical side direction is 5° to 16°, and the radius R1 of the arc segment 1 62 of the cutting edge 6 is 10mm to 50mm. The rake angle θ formed by the arc segment 2 63 of the cutting edge 6 and the surface along the vertical side direction is 5° to 16°, and the radius R2 of the arc segment 2 63 of the cutting edge 6 is 10mm to 50mm. Among them, the rake angle δ, the rake angle ε and the rake angle θ in the cutting edge are equal.

[0055] The front cutting surface of the chip breaker groove 14 is divided into front cutting surface one 8, front cutting surface two 9, and front cutting surface three 11 by the connection line of the three sections of the straight line segment 61, arc segment one 62 and arc segment two 63 on the cutting edge 6 adjacent to the arc edge 7. Along the angle bisector P from the arc edge 7 to the direction of the positioning center hole 16, the chip breaker groove 14 is connected in the order of arc edge 7 (1), front cutting surface one 8, front cutting surface two 9, front cutting surface three 11, transition arc surface 10, chip breaker platform 12, and protrusion 13.

[0056] like Figure 4 , the rake angle α formed by the rake face 1 8 and the surface along the angle bisector is in the range of 5° to 20°, the rake angle β formed by the rake face 2 9 and the surface along the angle bisector is in the range of 5° to 20°, and the rake angle γ formed by the rake face 3 11 and the surface along the angle bisector is in the range of 5° to 20°. Among them, the rake angles α, β and γ of the rake face 1, the rake face 2 and the rake face 3 are all equal.

[0057] The protrusion 13 is in the shape of a "water drop" with one side protruding and extending, and the extension of the water drop shape points to the top corner of the blade body 1. The distance L from the center of the protrusion 13 to the arc edge 7 along the angle bisector P is 1mm to 4.5mm.

[0058] Example 3

[0059] This embodiment provides a titanium alloy finishing cutting blade with optimized parameters, such as Figure 1 The titanium alloy finishing cutting blade includes a blade body 11 and a cutting unit arranged at the top corner of the blade body 11. The blade body 1 is a polygonal body, and cutting units are arranged at the three top corners. The blade body 1 includes an upper surface 2, a lower surface 3, a plurality of side surfaces 4, and an arc surface 5 located between two adjacent side surfaces 4. A positioning center hole 16 is arranged at the geometric center of the blade body 1.

[0060] like Figure 2 The cutting unit is composed of a circular arc edge 7, a cutting edge 6, and a chip breaker 14, and the cutting unit is symmetrically distributed about the angle bisector P. The circular arc edge 7 is formed by the intersection of the circular arc surface 5 and the upper surface 2, the cutting edge 6 is formed by the intersection of the side surface 4 and the upper surface 2, and the chip breaker 14 is composed of a rake face, a chip groove 17, a chip breaker platform 12 and a protrusion 13.

[0061] The cutting edge 6 is composed of three sections, namely, a straight line section 61, a circular arc section 1 62 and a circular arc section 2 63, from the circular arc vertex of the blade body 1. Figure 5-8 The rake angle δ formed by the straight segment 61 of the cutting edge 6 and the upper surface 2 along the vertical side surface direction is 10°, and the blade inclination angle ρ formed by the straight segment 61 and the projection straight line on the surface is 8°. The rake angle ε formed by the arc segment 1 62 of the cutting edge 6 and the upper surface 2 along the vertical side surface direction is 10°, and the radius R1 of the arc segment 1 62 of the cutting edge 6 is 35 mm. The rake angle θ formed by the arc segment 2 63 of the cutting edge 6 and the surface along the vertical side surface direction is 10°, and the radius R2 of the arc segment 2 63 of the cutting edge 6 is 25 mm.

[0062] The front cutting surface of the chip breaker groove 14 is divided into front cutting surface one 8, front cutting surface two 9, and front cutting surface three 11 by the connection line of the three sections of the straight line segment 61, arc segment one 62 and arc segment two 63 on the cutting edge 6 adjacent to the arc edge 7. Along the angle bisector P from the arc edge 7 to the direction of the positioning center hole 16, the chip breaker groove 14 is connected in the order of arc edge 7 (1), front cutting surface one 8, front cutting surface two 9, front cutting surface three 11, transition arc surface 10, chip breaker platform 12, and protrusion 13.

[0063] like Figure 4 The rake angle α formed by the rake face 1 8 and the surface along the angle bisector is in the range of 13°, the rake angle β formed by the rake face 2 9 and the surface along the angle bisector is in the range of 13°, and the rake angle γ formed by the rake face 3 11 and the surface along the angle bisector is in the range of 13°.

[0064] The protrusion 13 is in the shape of a "water drop" with one side protruding and extending, and the extension of the water drop shape points to the top corner of the blade body 1. The distance L from the center of the protrusion 13 to the arc edge 7 along the angle bisector P is 3.2 mm.

[0065] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled 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 list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A titanium alloy finishing cutting blade, characterized in that: The blade body comprises an upper surface, a lower surface and a plurality of side surfaces for connecting the upper surface and the lower surface, and the adjacent side surfaces are connected by arc surfaces. A positioning center hole is provided at the geometric center of the blade body, and a cutting unit is arranged at the top corner of the blade body, and the cutting unit comprises an arc edge, a cutting edge and a chip breaker groove; The arc edge is formed by the intersection of the arc surface and the upper surface or the lower surface, the cutting edge is formed by the intersection of the side surface and the upper surface or the lower surface, and the cutting edge is composed of three sections of a straight line segment, a first arc segment and a second arc segment; the straight line segment of the cutting edge forms a rake angle δ with the surface along the direction perpendicular to the side surface of 5° to 16°, the first arc segment forms a rake angle ε with the surface along the direction perpendicular to the side surface of 5° to 16°, and the second arc segment forms a rake angle θ with the surface along the direction perpendicular to the side surface of 5° to 16°; The chip breaker groove is composed of an arc edge, a front cutting edge, a transition arc surface, a chip breaker platform and a protrusion connected in sequence. The connection line of the three sections on the cutting edge adjacent to the arc edge divides the front cutting edge into front cutting edge one, front cutting edge two and front cutting edge three; the front angle α formed by the front cutting edge one and the surface along the angle bisector is in the range of 5° to 20°, the front angle β formed by the front cutting edge two and the surface is in the range of 5° to 20°, and the front angle γ formed by the front cutting edge three and the surface is in the range of 5° to 20°.

2. The titanium alloy finishing cutting insert according to claim 1, characterized in that: The blade body is a polygonal body, and at least one cutting unit is arranged on it.

3. The titanium alloy finishing cutting insert according to claim 1, characterized in that: The rake angle δ=ε=θ.

4. The titanium alloy finishing cutting insert according to claim 1, characterized in that: The cutting edge inclination angle ρ formed by the straight line segment of the cutting edge and the projection straight line on the surface is 0° to 20°.

5. The titanium alloy finishing cutting insert according to claim 1, characterized in that: The radius R1 of the arc segment 1 of the cutting edge is 10 mm to 50 mm; the radius R2 of the arc segment 2 of the cutting edge is 10 mm to 50 mm.

6. The titanium alloy finishing cutting insert according to claim 1, characterized in that: The rake angle α=β=γ.

7. The titanium alloy finishing cutting insert according to claim 1, characterized in that: The protrusion is in the shape of a "water drop" with one side protruding and extending, and the extension of the water drop shape points to the top corner of the blade body.

8. The titanium alloy finishing cutting insert according to claim 1, characterized in that: The distance L from the center of the protrusion to the arc edge along the angle bisector is 1 mm to 4.5 mm.

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