Cutting tool

Abstract

The invention belongs to the technical field of cutting machining, and discloses a cutting tool which comprises a main body part and a cutting part, the axis direction of the cutting part is the same as that of the main body part, and the outer surface of the cutting part comprises an auxiliary rear tool face and an outer side tool face which are oppositely arranged in the thickness direction of the cutting part; a front tool face and a main rear tool face which are arranged in an included angle mode are arranged between the auxiliary rear tool face and the outer side tool face, the main rear tool face and the front tool face are connected to form a main cutting edge, a first chamfering face is arranged between the auxiliary rear tool face and the main rear tool face, and the first chamfering face extends towards the direction of the front tool face and is connected with the front tool face to form a first chamfering edge. A second chamfering face is arranged between the outer side tool face and the main rear tool face, the second chamfering face extends towards the front tool face and is connected with the front tool face to form a second chamfering edge, and the first chamfering edge and the second chamfering edge are connected with the main cutting edge. According to the cutting tool provided by the invention, the risks of cutting edge breakage and tool breakage can be reduced, and the service life can be longer.

Description

Technical Field

[0001] The invention relates to the technical field of cutting processing, and in particular to a cutting tool. Background Art

[0002] Cutting refers to the use of cutting tools (including knives, grinding tools and abrasives) to cut off the excess material layer on the blank or workpiece to obtain the specified geometric shape, size and surface quality. Cutting is to directly squeeze and cut the workpiece through the cutting edge to cut off the workpiece material. It is widely used in metal processing, wood processing and other fields.

[0003] In the application scenario of machining annular grooves on the end face of stainless steel bars, an indexable end face grooving blade is usually used to achieve the machining of the annular groove. In the prior art, the indexable end face grooving blade is detachably connected to the shank, and the tip of the indexable end face grooving blade includes a rake face, a flank face and two side faces, the rake face, the flank face and the two side faces form a blade, and the rake face, the flank face and one side face form a sharp angle, the rake face, the flank face and the other side face form another sharp angle, in the process of cutting the annular groove, the blade and the two sharp angles are in contact with the end face of the stainless steel bar, because the width of the annular groove is small, the cutting depth is large, and the structural strength of the two sharp angles is small, therefore, it is easier to have the problem of sharp angle fracture, and then there is a risk of edge chipping and tool breakage, resulting in a short service life of the cutting tool. Summary of the invention

[0004] The object of the present invention is to provide a cutting tool which can reduce the risk of edge chipping and tool breakage and has a longer service life.

[0005] As conceived above, the technical solution adopted by the present invention is:

[0006] A cutting tool, comprising an integrally formed main body and a cutting part, wherein the axial direction of the cutting part is the same as the axial direction of the main body, and the outer surface of the cutting part comprises a secondary flank face and an outer blade face which are arranged opposite to each other in the thickness direction of the cutting part, and both the secondary flank face and the outer blade face are cambered surfaces;

[0007] A rake face and a main rake face arranged at an angle are provided between the secondary rake face and the outer rake face, the main rake face is connected to the rake face to form a main cutting edge, a first chamfered surface is provided between the secondary rake face and the main rake face, the first chamfered surface extends in the direction of the rake face and is connected to the rake face to form a first chamfered edge, a second chamfered surface is provided between the outer rake face and the main rake face, the second chamfered surface extends in the direction of the rake face and is connected to the rake face to form a second chamfered edge, and the first chamfered edge and the second chamfered edge are connected to the main cutting edge.

[0008] Optionally, a side of the rake face away from the main cutting edge is recessed to form a chip groove;

[0009] The chip groove extends to the secondary back cutting edge, and the contour of the chip groove on the secondary back cutting edge is arc-shaped, and the radius r of the contour ranges from 0.2mm to 2mm; the depth h of the chip groove ranges from 0.1mm to 1mm; in the axial direction of the cutting portion, the maximum distance between the chip groove and the main cutting edge is the chip length L, and the chip length L ranges from 1mm to 3mm.

[0010] Optionally, the cutting tool further comprises a transition portion, wherein the transition portion is connected between the main body portion and the cutting portion and is an integrated structure with the main body portion and the cutting portion;

[0011] The transition portion has a first transition camber surface and a second transition camber surface, the first transition camber surface is connected to and coplanar with the secondary back cutting edge, and the curvature radius R1 of the secondary back cutting edge is in the range of (0.4-0.6)Dn, the second transition camber surface is connected to the front cutting edge, and the curvature radius R2 of the second transition camber surface is in the range of (1.1-2.0)Dn, wherein Dn is the minimum distance between the first chamfering edge and the axis of the main body.

[0012] Optionally, the cutting portion has an arc-shaped structure, the main cutting edge is located at one end of the cutting portion away from the main body portion, and the circumferential length of the cutting portion gradually increases in the axial direction of the cutting portion and in the direction from the main cutting edge to the main body portion.

[0013] Optionally, a first center angle θ1 of the main back cutting surface between two ends of the cutting portion in the circumferential direction is in the range of 15°-40°; a second center angle θ2 of the first chamfered surface between two ends of the cutting portion in the circumferential direction is in the range of 40°-90°.

[0014] Optionally, the working front angle γ of the main cutting edge has a value range of 5° to 20°, and the main working back angle α0 of the main cutting edge has a value range of 5° to 15°.

[0015] Optionally, the front cutting surface is connected to the secondary rear cutting surface to form a first secondary cutting edge, and the first secondary cutting edge is connected to the first chamfering edge; the front cutting surface is connected to the outer cutting surface to form a second secondary cutting edge, and the second secondary cutting edge is connected to the second chamfering edge.

[0016] Optionally, the angle between the first secondary cutting edge and the axis of the cutting portion is a first working clearance angle α1′, and the value range of the first working clearance angle α1′ is 0.5°-3°; the angle between the first secondary cutting edge and the axis of the cutting portion is a second working clearance angle α2′, and the value range of the second working clearance angle α2′ is 0.5°-3°;

[0017] The first secondary working clearance angle α1″ of the first secondary cutting edge on the cutting end face is in the range of 0.5°-5°; the second secondary working clearance angle α2″ of the second secondary cutting edge on the cutting end face is in the range of 0.5°-5°; wherein the cutting end face is perpendicular to the axis of the cutting portion.

[0018] Optionally, the angle range between the first chamfer edge and the main cutting edge is 130°-140°; the angle range between the second chamfer edge and the main cutting edge is 130°-140°; the length of the first chamfer edge is (0.5%-3%) Dn; the length of the second chamfer edge is (0.5%-3%) Dn; wherein Dn is the minimum distance between the first chamfer edge and the axis of the main body.

[0019] Optionally, a projection of the main cutting edge in the axial direction of the cutting portion is in a straight line or a curved line.

[0020] Beneficial effects of the present invention:

[0021] The cutting tool provided by the present invention has a first chamfered surface between the secondary rear face and the main rear face, and a second chamfered surface between the outer face and the main rear face. The first chamfered surface extends in the direction of the front face and connects with the front face to form a first chamfered edge, and the second chamfered surface extends in the direction of the front face and connects with the front face to form a second chamfered edge, and the main cutting edge is connected with the first chamfered edge and the second chamfered edge, so that the tip formed by the combination of the main cutting edge, the first chamfered edge and the second chamfered edge does not have a sharp tip or sharp corner. When used in processing a structure with a small width and a large cutting depth, the tip is not prone to breakage, the strength of the tip is improved, the risk of tip chipping and tool breakage is avoided, and the problem of excessive wear of the cutting tool is avoided, thereby extending the service life of the cutting tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0023] Figure 1is a schematic structural diagram of a cutting tool provided by an embodiment of the present invention;

[0024] Figure 2 is a front view of a cutting tool provided by an embodiment of the present invention;

[0025] Figure 3 is a top view of a cutting tool provided by an embodiment of the present invention;

[0026] Figure 4 is a rear view of a cutting tool provided by an embodiment of the present invention;

[0027] Figure 5 The present invention Figure 4 The enlarged view of point A is shown;

[0028] Figure 6 is a first partial enlarged view of a cutting tool provided by an embodiment of the present invention;

[0029] Figure 7 is a partial enlarged view of a top view of a cutting tool provided by an embodiment of the present invention;

[0030] Figure 8 is a side view of a cutting tool provided by an embodiment of the present invention;

[0031] Fig. 9 is a second partial enlarged view of the cutting tool provided by an embodiment of the present invention;

[0032] Fig.10 is a third partial enlarged view of the cutting tool provided by the embodiment of the present invention;

[0033] Fig.11 The present invention Fig.10 The enlarged view of point B is shown;

[0034] Fig.12 It is a schematic structural diagram of a cutting portion provided by an embodiment of the present invention.

[0035] In the figure:

[0036] 1. Main body; 11. Clamping section; 12. Clamping and positioning section;

[0037] 2. Cutting part; 21. Secondary flank; 22. Outer blade; 23. Front blade; 231. Chip groove; 24. Primary flank; 25. First chamfered surface; 26. Secondary chamfered surface; 27. Primary cutting edge; 28. First chamfered edge; 29. ​​Secondary chamfered edge; 210. First secondary cutting edge; 211. Secondary secondary cutting edge;

[0038] 3. transition portion; 31. first transition arc surface; 32. second transition arc surface; 33. transition bottom surface;

[0039] X, first direction; Y, second direction. DETAILED DESCRIPTION

[0040] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, not all.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0042] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present invention, unless otherwise clearly stipulated and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. In the description of this embodiment, unless otherwise specified, "multiple" specifically refers to two or more.

[0044] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0045] It should be noted that when an element is referred to as being “fixed to” or “disposed on” another element, it may be directly on the other element or there may be a central element.

[0046] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0047] This embodiment provides a cutting tool that can prevent the risk of cutting edge chipping and tool breakage and has a long service life.

[0048] Illustratively, the cutting tool provided in this embodiment can be used to process annular grooves, annular holes or other structures on the end surface of stainless steel or other materials, and this embodiment is not limited to this.

[0049] like Figures 1 to 4 As shown, the cutting tool includes an integrally formed main body 1 and a cutting part 2. By setting the cutting part 2 and the main body 1 as an integrally formed structure, on the one hand, there is no need to assemble the main body 1 and the cutting part 2, and on the other hand, the cutting part 2 and the main body 1 can have a strong connection strength, reducing the probability of separation.

[0050] In some optional embodiments, such as Figure 1 and Figure 2 As shown, the main body 1 includes a clamping section 11 and a clamping and positioning section 12, and the clamping and positioning section 12 is connected between the clamping section 11 and the cutting section 2. The clamping and positioning section 12 is used for clamping and positioning the cutting tool. For example, the clamping and positioning section 12 can have a positioning plane to facilitate positioning. The clamping section 11 can be used for clamping the device.

[0051] In this embodiment, the cutting portion 2 is disposed at one end of the main body 1, and the axial direction of the cutting portion 2 is the same as the axial direction of the main body 1. The axial direction of the cutting portion 2 may or may not coincide with the axial direction of the main body 1, which is not limited in this embodiment. In this embodiment, for ease of description, the axial direction of the cutting portion 2 is referred to as the first direction X.

[0052] like Figure 1 , Figure 4 and Figure 5 As shown, the outer surface of the cutting portion 2 includes a secondary back cutting surface 21 and an outer cutting surface 22 which are arranged opposite to each other in the thickness direction of the cutting portion 2. Figure 8 As shown, the secondary flank surface 21 and the outer blade surface 22 are both cambered surfaces, and both are bent toward the axis of the cutting portion 2, and the bending directions of the two are the same. Among them, the thickness direction of the cutting portion 2 is perpendicular to the axial direction of the cutting portion 2. In this embodiment, for the convenience of description, the thickness direction of the cutting portion 2 is referred to as the second direction Y.

[0053] In this embodiment, the outer surface of the cutting portion 2 also includes a rake face 23 and a main flank face 24. The rake face 23 and the main flank face 24 are arranged at an angle between the secondary flank face 21 and the outer flank face 22. In addition, the main flank face 24 and the rake face 23 are connected to form a main cutting edge 27. A first chamfered surface 25 is provided between the secondary flank face 21 and the main flank face 24. The first chamfered surface 25 extends in the direction of the rake face 23 and is connected to the rake face 23 to form a first chamfered edge 28 (such as Fig.10 and Fig.11 A second chamfered surface 26 is provided between the outer blade surface 22 and the main back blade surface 24. The second chamfered surface 26 extends toward the front blade surface 23 and connects with the front blade surface 23 to form a second chamfered edge 29 (such as Fig.10 and Fig.11 The first chamfering edge 28 and the second chamfering edge 29 are connected to the main cutting edge 27 .

[0054] For example, the end face of the cutting portion 2 facing away from the main body 1 is called the front end face. Figure 2 In the figure, the surface on the right side of the cutting portion 2 is the front end surface. One side surface in the width direction of the cutting portion 2 is called the top surface. Figure 2 In the figure, the surface of the cutting portion 2 located at the top is the top surface. The other side surface of the cutting portion 2 in the width direction is called the bottom surface. Figure 2 In the figure, the surface of the cutting portion 2 located at the bottom is the bottom surface. Among them, at least a part of the top surface is the front cutting edge 23, and the back cutting edge is a part of the front end surface. It should be noted that the width direction of the cutting portion 2 is the circumferential direction of the cutting portion 2, and therefore, the width of the cutting portion 2 is the dimension in the circumferential direction of the cutting portion 2. Among them, the first chamfered surface 25, the main back cutting edge 24 and the second chamfered surface 26 cooperate to form the front end surface of the cutting portion 2. It can be understood that the first chamfered surface 25 can be formed by chamfering the edge formed by the secondary back cutting edge 21 and the main back cutting edge 24, and similarly, the second chamfered surface 26 can be formed by chamfering the edge formed by the outer cutting edge 22 and the main back cutting edge 24, and this embodiment does not limit this.

[0055] Alternatively, if Fig.11As shown, the angle between the first chamfering edge 28 and the main cutting edge 27 is P1, and the range of P1 is 130°-140°. The angle between the second chamfering edge 29 and the main cutting edge 27 is P2, and the range of P2 is 130°-140°, so as to improve the chamfering effect of the tool tip, thereby reducing the risk of fracture of the tool tip at both ends in the second direction Y. For example, the angle between the first chamfering edge 28 and the main cutting edge 27 is 130°, 135°, 138°, 140°. For example, the angle between the second chamfering edge 29 and the main cutting edge 27 is 130°, 135°, 138°, 140°. In this embodiment, the angle between the first chamfering edge 28 and the main cutting edge 27 is 45°, and the angle between the second chamfering edge 29 and the main cutting edge 27 is 45°, that is, a 45° process chamfer is provided on both sides of the main cutting edge 27.

[0056] In this embodiment, please continue to refer to Figure 1 , the front cutting face 23 is connected to the main rear cutting face 24 to form a main cutting edge 27, the first chamfered face 25 is connected to the front cutting face 23 to form a first chamfered edge 28, and the second chamfered face 26 is connected to the front cutting face 23 to form a second chamfered edge 29, wherein the main cutting edge 27 is connected to both the first chamfered edge 28 and the second chamfered edge 29, thereby avoiding the situation where the two ends of the main cutting edge 27 have sharp tips. In this embodiment, the structure formed by the combination of the main cutting edge 27, the first chamfered edge 28 and the second chamfered edge 29 is called a cutting tip. It should be noted that the first chamfered edge 28 is inclined from the main cutting edge 27 toward the inside of the cutting portion 2, and the second chamfered edge 29 is inclined from the main cutting edge 27 toward the inside of the cutting portion 2, so as to ensure that the two ends of the main cutting edge 27 can form a chamfer.

[0057] The cutting tool provided in this embodiment has a first chamfered surface 25 between the secondary back cutting edge 21 and the main back cutting edge 24, and a second chamfered surface 26 between the outer cutting edge 22 and the main back cutting edge 24. The first chamfered surface 25 extends in the direction of the rake face 23 and connects with the rake face 23 to form a first chamfered edge 28, and the second chamfered surface 26 extends in the direction of the rake face 23 and connects with the rake face 23 to form a second chamfered edge 29, and the main cutting edge 27 is connected to the first chamfered edge 28 and the second chamfered edge 29, so that the cutting tip formed by the combination of the main cutting edge 27, the first chamfered edge 28 and the second chamfered edge 29 does not have a tip or sharp corner. When used in a structure with a small processing width and a large cutting depth, the cutting tip is not prone to breakage, which improves the strength of the cutting tip, avoids the risk of chipping and tool breakage, and avoids the problem of excessive wear of the cutting tool, thereby extending the service life of the cutting tool.

[0058] In some optional embodiments, such as Figure 1 , Figure 6 or Figure 7As shown, the rake face 23 is provided with a chip groove 231. The side of the rake face 23 away from the main cutting edge 27 is recessed to form the chip groove 231. Specifically, the rake face 23 is recessed along the width direction of the cutting portion 2 to form the chip groove 231. By providing the chip groove 231 on the rake face 23, the cutting tool has good chip rolling, chip breaking and chip removal performance, and reduces the risk of chip blocking.

[0059] In some optional embodiments, one end of the chip groove 231 in the thickness direction of the cutting portion 2 (i.e., the second direction Y) extends to the secondary back cutting edge 21, and the other end extends to the outer cutting edge 22, so as to avoid chips being retained in the chip groove 231 and facilitate the discharge of chips from the secondary back cutting edge 21 side and the outer cutting edge 22.

[0060] Exemplarily, the contour of the chip groove 231 on the secondary flank 21 is in the shape of an arc, and the radius r of the contour is in the range of 0.2 mm to 2 mm. The chip groove 231 in this embodiment is an iso-sized structure, that is, the contour of the chip groove 231 on the outer blade surface 22 is also in the shape of an arc. If the radius r of the contour of the chip groove 231 on the secondary flank 21 is too large, it will occupy a larger space on the front blade surface 23, thereby affecting the strength of the main cutting edge 27; if the radius r of the contour of the chip groove 231 on the secondary flank 21 is too small, the curvature of the chip groove 231 will be too large, which is not conducive to the entry and discharge of debris into the chip groove 231. For example, the radius r of the contour of the chip groove 231 on the secondary flank 21 is 0.2 mm, 0.4 mm, 0.8 mm, 1.0 mm, 1.2 mm, 1.4 mm, 1.8 mm, 2 mm.

[0061] Optionally, the depth h of the chip groove 231 ranges from 0.1 mm to 1 mm. If the depth h of the chip groove 231 is too small, the chip rolling and chip removal effects cannot be achieved. If the depth h of the chip groove 231 is too large, it is not conducive to the removal of the debris in the chip groove 231, and there is a risk of chip blocking. For example, the depth h of the chip groove 231 is 0.1 mm, 0.3 mm, 0.5 mm, 0.8 mm, 0.9 mm, and 1 mm.

[0062] like Fig. 9As shown, in the axial direction of the cutting portion 2 (i.e., the first direction X), the maximum distance between the chip groove 231 and the main cutting edge 27 is the chip length L, and the value range of the chip length L is 1mm-3mm. It should be noted that the chip length L is the distance between the point where the notch of the chip groove 231 is farthest from the main cutting edge 27 and the main cutting edge 27 in the first direction X. If the chip length L is too large, the chip groove 231 is far away from the main cutting edge 27, which is not conducive to chip rolling; if the chip length L is too small, it will affect the strength of the main cutting edge 27, and there is a high risk of tip breakage. For example, the chip length L is 1.0mm, 1.2mm, 1.4mm, 1.8mm, 2mm, 2.5mm, 2.8mm, 3mm.

[0063] Alternatively, if Figures 1 to 3 As shown, the cutting tool further includes a transition portion 3, which is connected between the main body 1 and the cutting portion 2 and is an integrated structure with the main body 1 and the cutting portion 2. By providing the transition portion 3, the transition between the main body 1 and the cutting portion 2 is achieved, so that the main body 1 is not too small and the size of the cutting portion 2 is not too large.

[0064] Exemplarily, the center of the transition portion 3 is set as a hollow structure and extends outward along a portion of the circumference, so that the cross-section of the transition portion 3 is U-shaped, that is, the transition portion 3 has a U-shaped groove to match the shape of the cutting portion 2.

[0065] Furthermore, the cross section of the transition portion 3 in this embodiment is arc-shaped, and, as Figure 1 As shown, the width of the transition portion 3 is greater than the width of the cutting portion 2. The width of the transition portion 3 refers to the size of the transition portion 3 in its circumferential direction.

[0066] In some optional embodiments, such as Fig. 9 As shown, the transition portion 3 has a first transition camber 31 and a second transition camber 32. The first transition camber 31 is the inner surface of the transition portion 3 facing its axis. The first transition camber 31 is butted against and coplanar with the secondary flank 21, that is, the first transition camber 31 and the secondary flank 21 smoothly transition to improve the integrity of the transition portion 3 and the cutting portion 2, that is, the radius of the circle where the first transition camber 31 is located is the same as the radius of the circle where the secondary flank 21 is located.

[0067] Exemplarily, the curvature radius R1 of the secondary flank 21 ranges from (0.4-0.6)Dn. Wherein, Dn is the minimum distance between the first chamfered edge 28 and the axis of the main body 1. If the curvature radius R1 of the secondary flank 21 is too large, that is, the degree of change in the curvature of the curve is too large, on the one hand, it will lead to a smaller width of the cutting edge, and on the other hand, it will also affect the strength of the main cutting edge 27. If the curvature radius R1 of the secondary flank 21 is too small, that is, the degree of change in the curvature of the curve is too small, the secondary flank 21 will be close to a plane, which will further affect the rigidity of the cutting portion 2. For example, the curvature radius R1 of the secondary flank 21 is 0.4Dn, 0.5Dn, and 0.6Dn.

[0068] Exemplarily, the main body 1 is cylindrical, and the diameter of the main body 1 is 3 mm-16 mm. For example, the diameter of the main body 1 is 3 mm, 5 mm, or 6 mm. Define the center point located on the axis of the main body 1, that is, Fig.12 At point O shown, Dn can be considered as the minimum diameter of the cutting tool passing through point O. The maximum diameter of the cutting tool passing through point O is Dx.

[0069] In this embodiment, please continue to refer to Fig. 9 , the second transition arc surface 32 is connected to the front cutting edge 23. In the present embodiment, the second transition arc surface 32 is a side surface of the transition portion 3 in the width direction. A surface of the main body 1 is connected to the front cutting edge 23 through the second transition arc surface 32. Moreover, the value range of the radius of curvature R2 of the second transition arc surface 32 is (1.1-2.0)Dn. When the radius of curvature R2 of the second transition arc surface 32 is too large, it will affect the effect of the transition portion 3, and thus make the transition portion 3 more prone to premature failure. If the radius of curvature R2 of the second transition arc surface 32 is too small, the axial dimension of the cutting tool will be too large, which is not conducive to the miniaturization of the cutting tool. For example, the radius of curvature R2 of the second transition arc surface 32 is 1.1Dn, 1.5Dn, 1.6Dn, 1.8Dn, 2.0Dn.

[0070] In this embodiment, the other side surface of the transition portion 3 in the width direction (named as the transition bottom surface 33) is butted against the first chamfered surface 25, and the two are arranged at an angle.

[0071] In some optional embodiments, the length of the first chamfering edge 28 is (0.5%-3%) Dn. For example, the length of the first chamfering edge 28 is 0.5% Dn, 1.5% Dn, 2% Dn, 2.5% Dn, 3% Dn. The length of the second chamfering edge 29 is (0.5%-3%) Dn. For example, the length of the second chamfering edge 29 is 0.5% Dn, 1.5% Dn, 2% Dn, 2.5% Dn, 3% Dn. The length of the first chamfering edge 28 and the length of the second chamfering edge 29 are not too large to ensure that the main cutting edge 27 can have a sufficient length, thereby ensuring the cutting effect of the cutting tool.

[0072] Optionally, see Fig.12 , the two ends of the main flank face 24 in the circumferential direction of the cutting portion 2 form a first central angle θ1, that is, the first central angle θ1 is the central angle formed by the main flank face 24 from the main cutting edge 27 to the tail end of the main flank face 24 in the axial direction, that is, the angle between the line connecting the main cutting edge 27 and point O, and the line connecting the end of the main flank face 24 facing away from the main cutting edge 27 and point O. Moreover, the value range of the first central angle θ1 is 15°-40°. If the value of the first central angle θ1 is too large, it means that the size of the main flank face 24 is large, so that the cutting tool can only process grooves with a larger width, and the application scenarios are relatively small; if the value of the first central angle θ1 is too small, it means that the size of the main flank face 24 is small, which will affect the strength and rigidity of the main cutting edge 27. For example, the first central angle θ1 is 15°, 25°, 30°, 35°, 38°, 40°.

[0073] The second center angle θ2 formed by the two ends of the first chamfered surface 25 in the circumferential direction of the cutting portion 2, that is, the second center angle θ2 is the center angle formed by the first chamfered surface 25 from the first chamfered edge 28 to the transition bottom surface 33 in the axial direction, that is, the angle between the line connecting the cutting edge and point O and the line connecting the end of the first chamfered surface 25 facing away from the first chamfered edge 28 and point O. In addition, the value range of the second center angle θ2 is 40°-90°. If the second center angle θ2 is too large, it means that the width of the cutting portion 2 is too large, thereby limiting the application range of the cutting portion 2; if the second center angle θ2 is too small, it means that the width of the cutting portion 2 is too small, resulting in the cutting portion 2 being prone to fracture. For example, the second center angle θ2 is 40°, 45°, 60°, 65°, 78°, 80°, 85°, 90°.

[0074] Optionally, refer to Fig. 9 The working rake angle γ of the main cutting edge 27 ranges from 5° to 20°. The specific value of the working rake angle γ is determined by the cutting edge material and the workpiece material. If the working rake angle is too small, the cutting tool will not be sharp enough, the cutting heat will increase, and the chip breaking and chip removal capabilities will decrease. If the working rake angle γ is too large, the tool tip will be stressed and the heat will be concentrated, resulting in damage to the main cutting edge 27 and premature failure. For example, the working rake angle γ of the main cutting edge 27 is 5°, 8°, 10°, 12°, 15°, 18°, and 20°.

[0075] Optionally, the main working clearance angle α0 of the main cutting edge 27 ranges from 5° to 15°. The specific value of the main working clearance angle α0 is determined by the cutting edge material and the surface quality of the inner hole or groove of the workpiece to be formed. If the main working clearance angle α0 is too small, the wear value of the main clearance face 24 will increase faster and the life of the cutting tool will be reduced. If the main working clearance angle α0 is too large, the contact area between the main clearance face 24 and the inner hole surface or groove wall of the workpiece will be reduced, and the surface quality of the processed workpiece will be reduced. Therefore, this embodiment chooses to limit the value of the main working clearance angle α0 to between 5° and 15°, which can ensure the service life of the tool and improve the surface quality of the processed workpiece. For example, the main working clearance angle α0 of the main cutting edge 27 is 5°, 8°, 10°, 12°, or 15°.

[0076] In some optional embodiments, such as Figure 1 or Figure 7 As shown, the rake face 23 is connected to the secondary flank face 21 to form a first secondary cutting edge 210, and the first secondary cutting edge 210 is connected to the first chamfer edge 28. The rake face 23 is connected to the outer face 22 to form a second secondary cutting edge 211, and the second secondary cutting edge 211 is connected to the second chamfer edge 29, that is, the first secondary cutting edge 210, the first chamfer edge 28, the main cutting edge 27, the second chamfer edge 29, and the second secondary cutting edge 211 are connected in sequence. By providing the first secondary cutting edge 210 and the second secondary cutting edge 211, the surface quality of the hole wall or the groove wall formed by processing can be further improved.

[0077] For example, Fig.10 As shown, the angle between the first secondary cutting edge 210 and the axis of the cutting portion 2 is the first working clearance angle α1′, and the value range of the first working clearance angle α1′ is 0.5°-3°. The first working clearance angle α1′ is not easy to be too large to avoid the thinning of the thickness of the cutting portion 2, thereby ensuring the strength of the cutting portion 2. For example, the first working clearance angle α1′ is 0.5°, 1.5°, 2.5°, and 3°.

[0078] Optionally, the angle between the first secondary cutting edge 210 and the axis of the cutting portion 2 is a second working clearance angle α2′, and the value range of the second working clearance angle α1′ is 0.5°-3°. The second working clearance angle α2′ is not too large to avoid the thinning of the cutting portion 2, thereby ensuring the strength of the cutting portion 2. For example, the first working clearance angle α1′ is 0.5°, 1.5°, 2.5°, 3°.

[0079] In this embodiment, please continue to refer to Fig.12 The first auxiliary working back angle α1″ of the first auxiliary cutting edge 210 on the cutting end face is in the range of 0.5°-5°. The cutting end face is perpendicular to the axis of the cutting portion 2. Fig.12As shown, the first secondary working clearance angle α1″ of the first secondary cutting edge 210 on the cutting end face is specifically the angle between the secondary clearance face 21 and the tangent of a circle formed with point O as the center and Dn as the radius. For example, the first secondary working clearance angle α1″ is 0.5°, 1.5°, 2.5°, 3°, 3.5°, 4°, or 5°.

[0080] For example, the value range of the second secondary working clearance angle α2″ of the second secondary cutting edge 211 on the cutting end face is 0.5°-5°. Fig.12 As shown, the second secondary working clearance angle α2″ of the second secondary cutting edge 211 on the cutting end face is specifically the angle between the secondary clearance face 21 and the tangent of a circle formed with point O as the center and Dn as the radius. The second secondary working clearance angle α2″ is 0.5°, 1.5°, 2.5°, 3°, 3.5°, 4°, and 5°.

[0081] In some optional embodiments, the projection of the main cutting edge 27 in the axial direction of the cutting portion 2 is in the shape of a straight line or a curved line, such as an arc or an inner concave circle, so that the effective cutting edge length can be longer. Figure 1 As shown, the main cutting edge 27 in this embodiment is in a straight line shape.

[0082] It can be understood that the first chamfering edge 28, the second chamfering edge 29, the first secondary cutting edge 210 and the second secondary cutting edge 211 can all be in the shape of a straight line, an arc, a concave circle or other curves, which is not limited in this embodiment.

[0083] In some optional embodiments, such as Fig.10 and Fig.12 As shown, the cutting portion 2 has an arc-shaped structure as a whole. In addition, the main cutting edge 27 is located at the end of the cutting portion 2 away from the main body 1, that is, the main cutting edge 27 is located at the end of the cutting portion 2. In the axial direction of the cutting portion 2 and in the direction from the main cutting edge 27 to the main body 1, the circumferential length of the cutting portion 2 gradually increases. In this way, on the one hand, the size of the end of the cutting portion 2 where the main cutting edge 27 is provided can be smaller, which can be used to process grooves of smaller size and can also be used in a small space, and has high versatility; on the other hand, along the direction from the main cutting edge 27 to the main body 1, the circumferential length of the cutting portion 2 gradually increases, which increases the connection area between the cutting portion 2 and the main body 1, can increase the structural strength of the cutting portion 2, reduce the risk of the cutting portion 2 breaking from the main body 1, and has higher reliability and longer service life.

[0084] The cutting tool provided in this embodiment can be used for annular grooving of stainless steel bars; one end of the main body 1 in the shape of a round bar is set as a cutting part 2 and a transition part 3; the cutting part 2 and the transition part 3 are both U-shaped hollow groove structures, and a cutting edge is arranged at the end of one end of the cutting part 2 along the circumferential direction; the cutting edge includes a main cutting edge 27, a first chamfering edge 28, a second chamfering edge 29, a first secondary cutting edge 210 and a second secondary cutting edge 211. The cutting part 2 has a front cutting edge 23 and a main back cutting edge 24, which form a working front angle γ and a main working back angle α0 of the main cutting edge 27 accordingly. A process chamfer is provided at each end of the main cutting edge 27, which can effectively protect the strength of the tool tip and avoid the chipping of the blade during the cutting process; a chip groove 231 located on the front cutting edge 23 is provided on one side of the main cutting edge 27 to facilitate chip rolling and chip removal during the cutting process. The cutting tool provided in this embodiment can effectively improve the shortcomings of the existing replaceable head end face groove blade when manufacturing a small-sized blade body structure, which is insufficient in strength, and can effectively improve the cutting rigidity, avoid the risk of chipping and breaking, and extend the service life of the cutting tool. The cutting tool provided in this embodiment is made of one or more materials selected from high-speed steel, cemented carbide, ceramic, and metal ceramic. Its processing object is not limited to stainless steel bar processing, and can also be used for P, K, N, S, and H type bar annular groove processing.

[0085] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A cutting tool, characterized in that The invention comprises an integrally formed main body (1) and a cutting part (2), wherein the axial direction of the cutting part (2) is the same as the axial direction of the main body (1), and the outer surface of the cutting part (2) comprises a secondary flank surface (21) and an outer blade surface (22) which are arranged opposite to each other in the thickness direction of the cutting part (2), and the secondary flank surface (21) and the outer blade surface (22) are both cambered surfaces; A rake face (23) and a main rake face (24) arranged at an angle are provided between the secondary rake face (21) and the outer rake face (22); the main rake face (24) and the rake face (23) are connected to form a main cutting edge (27); a first chamfered face (25) is provided between the secondary rake face (21) and the main rake face (24); the first chamfered face (25) extends in the direction of the rake face (23) and is connected to the rake face (23) to form a first chamfered edge (28); a second chamfered face (26) is provided between the outer rake face (22) and the main rake face (24); the second chamfered face (26) extends in the direction of the rake face (23) and is connected to the rake face (23) to form a second chamfered edge (29); the first chamfered edge (28) and the second chamfered edge (29) are connected to the main cutting edge (27).

2. The cutting tool according to claim 1, characterized in that The side of the rake face (23) away from the main cutting edge (27) is recessed to form a chip groove (231); The chip groove (231) extends to the secondary flank surface (21), and the profile of the chip groove (231) on the secondary flank surface (21) is in an arc shape, and the radius r of the profile is in the range of 0.2 mm to 2 mm; the depth h of the chip groove (231) is in the range of 0.1 mm to 1 mm; in the axial direction of the cutting portion (2), the maximum distance between the chip groove (231) and the main cutting edge (27) is a chip length L, and the chip length L is in the range of 1 mm to 3 mm.

3. The cutting tool according to claim 1 or 2, characterized in that: The cutting tool further comprises a transition portion (3), wherein the transition portion (3) is connected between the main body portion (1) and the cutting portion (2), and forms an integral structure with the main body portion (1) and the cutting portion (2); The transition portion (3) comprises a first transition camber (31) and a second transition camber (32), wherein the first transition camber (31) is butted against and coplanar with the secondary back cutting edge (21), and the curvature radius R1 of the secondary back cutting edge (21) is in the range of (0.4-0.6)Dn, and the second transition camber (32) is connected to the front cutting edge (23), and the curvature radius R2 of the second transition camber (32) is in the range of (1.1-2.0)Dn, wherein Dn is the minimum distance between the first chamfering edge (28) and the axis of the main body (1).

4. The cutting tool according to claim 1 or 2, characterized in that: The cutting portion (2) has an arc-shaped structure, the main cutting edge (27) is located at one end of the cutting portion (2) away from the main portion (1), and the circumferential length of the cutting portion (2) gradually increases in the axial direction of the cutting portion (2) and in the direction from the main cutting edge (27) to the main portion (1).

5. The cutting tool according to claim 1 or 2, characterized in that: The first center angle θ1 of the main back cutting surface (24) between the two ends in the circumferential direction of the cutting portion (2) is in the range of 15°-40°; the second center angle θ2 of the first chamfered surface (25) between the two ends in the circumferential direction of the cutting portion (2) is in the range of 40°-90°.

6. The cutting tool according to claim 1 or 2, characterized in that: The working front angle γ of the main cutting edge (27) has a value range of 5° to 20°, and the main working back angle α0 of the main cutting edge (27) has a value range of 5° to 15°.

7. The cutting tool according to claim 1 or 2, characterized in that: The front cutting surface (23) is connected to the secondary rear cutting surface (21) to form a first secondary cutting edge (210), and the first secondary cutting edge (210) is connected to the first chamfering edge (28); the front cutting surface (23) is connected to the outer cutting surface (22) to form a second secondary cutting edge (211), and the second secondary cutting edge (211) is connected to the second chamfering edge (29).

8. The cutting tool according to claim 7, characterized in that The angle between the first secondary cutting edge (210) and the axis of the cutting portion (2) is a first working clearance angle α1′, and the value range of the first working clearance angle α1′ is 0.5°-3°; the angle between the first secondary cutting edge (210) and the axis of the cutting portion (2) is a second working clearance angle α2′, and the value range of the second working clearance angle α2′ is 0.5°-3°; The first secondary working clearance angle α1″ of the first secondary cutting edge (210) on the cutting end face is in the range of 0.5°-5°; the second secondary working clearance angle α2″ of the second secondary cutting edge (211) on the cutting end face is in the range of 0.5°-5°; wherein the cutting end face is perpendicular to the axis of the cutting portion (2).

9. The cutting tool according to claim 1 or 2, characterized in that: The angle between the first chamfering edge (28) and the main cutting edge (27) is in the range of 130°-140°; the angle between the second chamfering edge (29) and the main cutting edge (27) is in the range of 130°-140°; the length of the first chamfering edge (28) is (0.5%-3%) Dn; the length of the second chamfering edge (29) is (0.5%-3%) Dn; wherein Dn is the minimum distance between the first chamfering edge (28) and the axis of the main body (1).

10. The cutting tool according to claim 1 or 2, characterized in that: The projection of the main cutting edge (27) in the axial direction of the cutting portion (2) is in a straight line or a curved line.

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