A cutting blade and tool

Abstract

This application relates to the field of cutting tool technology, and particularly to a cutting insert and tool. The cutting insert includes a base portion and a cutting portion connected to the base portion; the cutting portion includes a rake face, a flank face connecting the rake face, and two side flank faces connecting the rake face and the flank face; a cutting edge is formed at the intersection of the rake face and the flank face; a chip groove is provided on the rake face, and a central rake angle face is provided near the cutting edge in the direction of the chip groove, the central rake angle face forming a positive rake angle with the horizontal plane, and the width of the central rake angle face is smaller than the width of the cutting edge; a negative chamfer is provided on the rake face at its intersection with the flank face, the negative chamfer face including a narrow negative rake angle face extending from the central rake angle face to the cutting edge and a widened negative rake angle face extending from the narrow negative rake angle face towards the side flank faces. This application provides a cutting insert suitable for high-speed feed parting and grooving machining, which can achieve stable and efficient machining under high-speed feed conditions.

Description

Technical Field

[0001] This application relates to the field of cutting tool technology, and in particular to a cutting insert and a cutting tool. Background Technology

[0002] Cutting inserts are commonly used cutting tools in industry, with parting and grooving being a frequent operation. They are widely used in the machining of parts in general machinery, automobiles, and small components. In high-speed feed parting and grooving operations, the cutting inserts need to maintain a high feed rate to penetrate the rotating workpiece for cutting. For this type of machining, to ensure a smooth surface finish and avoid scratches and chatter marks, higher requirements are placed on the cutting edge strength, chip curling, chip breaking, and chip removal of the cutting inserts. Simultaneously, because the cutting insert penetrates deep into the workpiece during parting, heat dissipation is difficult. This is even more pronounced under high-speed feed conditions. High cutting temperatures can alter the properties of the workpiece material, affect the formation and disappearance of built-up edge on the cutting insert, directly impacting the surface quality and machining accuracy of the workpiece, and significantly affecting the lifespan and machining stability of the cutting inserts.

[0003] Currently, manufacturers on the market address the challenges of radial parting and grooving by using straight or curved cutting edges combined with their respective chip breaking groove designs, focusing on ensuring the strength of the cutting edge and the chip folding effect. However, in high-speed feed machining, the chips are thicker, the cutting force is greater, and more cutting heat is generated. Traditional parting and grooving inserts are unable to meet the requirements for cutting edge strength, heat dissipation, and chip folding under high-speed feed machining conditions. Summary of the Invention

[0004] To address the shortcomings of existing solutions mentioned in the background section, where existing cutting inserts suffer from insufficient edge strength and slow heat dissipation during high-speed feed grooving, especially under high-speed feed conditions, existing cutting inserts struggle to meet requirements for edge strength, heat dissipation, and chip removal. This application provides a cutting insert and tool to overcome these shortcomings of existing solutions, and the technical solution is as follows:

[0005] On one hand, this application provides a cutting insert, which includes a base portion and a cutting portion connected to the base portion; the cutting portion includes a rake face, a flank face connecting the rake face, and two side flank faces for connecting the rake face and the flank face; wherein, a cutting edge is formed at the intersection of the rake face and the flank face; a chip groove is provided on the rake face, and a central rake angle face is provided on the chip groove in the direction near the cutting edge, the central rake angle face forming a positive rake angle with the horizontal plane, and the central rake angle... The width of the face is less than the width of the cutting edge; the rake face has a negative chamfer at the intersection with the flank face, the negative chamfer includes a narrow negative rake angle face formed by extending from the central rake angle face to the cutting edge and a widened negative rake angle face formed by extending from the narrow negative rake angle face towards the side flank face, the cutting edge includes a narrow front sub-edge formed by the narrow negative rake angle face and the flank face and a wide front sub-edge formed by the widened negative rake angle face and the flank face.

[0006] In one embodiment, the length L2 of the widened negative rake angle face is equal to the width W of the cutting edge. c The relationship is L2 = W C / 10+λ, where λ is greater than or equal to 0.1 mm.

[0007] In one embodiment, the width W of the front narrow sub-blade z Greater than or equal to 0.3W C And less than or equal to 0.8W C .

[0008] In one embodiment, the length L1 of the narrow negative front corner face is greater than or equal to 0.05 mm and less than or equal to 0.18 mm; and / or, the length L2 of the widened negative front corner face is greater than or equal to 0.3 mm and less than or equal to 1.0 mm.

[0009] In one embodiment, the angle between the negative chamfer and the horizontal plane is ε, where ε is greater than or equal to 5° and less than or equal to 15°; and / or, the angle between the central front corner face and the horizontal plane is δ, where δ is greater than or equal to 15° and less than or equal to 30°.

[0010] In one embodiment, the chip groove is provided with a first chip-rolling slope in the direction close to the side rake face; the first chip-rolling slope is connected to the central rake face and the widened negative rake face respectively, and the width of the chip groove gradually decreases along the direction from the rake face to the bottom of the chip groove.

[0011] In one embodiment, the chip groove is further provided with a second chip-rolling inclined surface and a connecting arm in the direction near the side back face; the second chip-rolling inclined surface and the connecting arm are connected to the first chip-rolling inclined surface, and the connecting arm is located between the second chip-rolling inclined surface and the anti-chip surface at the bottom of the chip groove.

[0012] In one embodiment, the rake face is provided with a side reinforcing arm at the intersection of the rake face and the side rear face; the side reinforcing arm is connected to the second chip scraping surface, one side of the side reinforcing arm is connected to the widened negative rake angle surface, the other side of the side reinforcing arm extends toward the base portion, and the middle position of the side reinforcing arm is recessed inward to form an arc-shaped surface structure.

[0013] In one embodiment, the included angle between the two first chip inclines is α, the included angle between the two second chip inclines is β, β is greater than or equal to α, the included angle between the connecting arm and the anti-chip surface is γ, the value of 180°-2γ is less than α; α is greater than or equal to 140° and less than or equal to 160°; β is greater than or equal to 160° and less than or equal to 170°; γ is greater than or equal to 30° and less than or equal to 60°.

[0014] Based on the above, compared with the prior art, the cutting insert provided in this application has at least the following technical advantages:

[0015] The cutting insert of this application utilizes the narrow negative rake angle and the widened negative rake angle of the negative chamfered surface at the tool tip position to form a narrow front sub-edge and a wide front sub-edge at the cutting edge. During the cutting process, this structure causes a change in the contact length between the center and sides of the cutting edge, thereby generating an inward squeezing pressure on the cutting flow pattern, which in turn causes the chips to curl and improves the chip curling effect of the cutting insert. At the same time, due to the presence of the widened negative rake angle and the narrow negative rake angle of the negative chamfered surface, on the one hand, the narrow front sub-edge and the wide front sub-edge are subjected to force on the workpiece as face edges, reducing the force per unit area of ​​the cutting edge and effectively improving the tool tip strength of the cutting insert under high-speed feed conditions. On the other hand, the narrow negative rake angle and the central rake angle with a positive front angle can significantly improve the sharpness of the narrow front sub-edge at the center of the cutting edge. Under high-speed feed conditions, it can effectively reduce cutting resistance and thus improve the cutting efficiency of the cutting insert.

[0016] On the other hand, this application also provides a cutting tool, including a tool body and a cutting insert as described above, the cutting insert being mounted on the tool body.

[0017] Based on the above, compared with the prior art, the cutting tool provided in this application has at least the following technical effects: the cutting tool of this application installs the above-mentioned cutting insert on the tool body and uses the rotation of the tool body to drive the cutting insert to cut. The cutting tool of this application has the technical effects of the above-mentioned cutting insert, which will not be repeated here.

[0018] Other features and beneficial effects of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing the application. The objectives and other beneficial effects of this application may be realized and obtained by means of the structures particularly pointed out in the description, claims and drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Unless otherwise specified, the positional relationships in the drawings described below are based on the direction in which the components are drawn in the figures.

[0020] Figure 1 A three-dimensional structural schematic diagram of the cutting blade provided in an embodiment of this application;

[0021] Figure 2 A partial three-dimensional structural diagram of the cutting blade provided in the embodiments of this application. Figure 1 ;

[0022] Figure 3 A partial three-dimensional structural diagram of the cutting blade provided in the embodiments of this application. Figure 2 ;

[0023] Figure 4 A partial three-dimensional structural diagram of the cutting blade provided in the embodiments of this application. Figure 3 ;

[0024] Figure 5 The cutting insert provided in the embodiments of this application is along D D Projected view in the direction;

[0025] Figure 6 The cutting insert provided in the embodiments of this application is along D B Projected view in the direction;

[0026] Figure 7 for Figure 5 Magnified view of a portion of the cutting section E. Figure 1 ;

[0027] Figure 8 for Figure 5 Magnified view of a portion of the cutting section E. Figure 2 ;

[0028] Figure 9 for Figure 5 Cross-sectional view along section line BB;

[0029] Figure 10 for Figure 5 Cross-sectional view along the CC line;

[0030] Figure 11 The cutting insert provided in the embodiments of this application is along D R A partial sectional view of the directional projection;

[0031] Figure 12 for Figure 11 A partial enlarged schematic diagram of point A in the middle;

[0032] Figure 13 for Figure 11 A partial enlarged schematic diagram of point B in the middle;

[0033] Figure 14 This is a schematic diagram simulating the structure of the cutting blade provided in the embodiments of this application when it is clamped on the tool body to machine a workpiece.

[0034] Figure label:

[0035] 10 Cutting inserts 20 Machining workpiece 30 Tool body

[0036] 100 Cutting section 200 Base section

[0037] 210 Upper positioning surface of the insert 220 Lower positioning surface of the insert 230 Side support surface of the insert

[0038] 110 rake face, 120 front support surface, 130 side surface

[0039] 140 chip groove, 150 cutting edge, 111 negative chamfer.

[0040] 112 Side reinforcement arm; 1111 Narrow negative front angle face; 1112 Widened negative front angle face

[0041] 131 Side back edge 132 Side sub-edge 133 Blade tip arc

[0042] 141 Central front angle face; 142 First chip bevel face; 143 Second chip bevel face

[0043] 144 Connecting arm 145 Chip-reversing face 121 Rake face

[0044] 151 Narrow front sub-blade 152 Wide front sub-blade Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. The technical features designed in the different implementations of this application described below can be combined with each other as long as they do not conflict with each other. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0046] In the description of this application, it should be noted that all terms used in this application (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains, and should not be construed as limiting this application; it should be further understood that the terms used in this application should be understood to have the same meaning as those in the context of this specification and the relevant field, and should not be understood in an idealized or overly formal sense, except as expressly defined in this application.

[0047] Please refer to Figure 1-3 The cutting portion 100 at one end of the cutting blade 10 ( Figure 1 Taking the cutting section 100 circled in the middle as an example, in this paper, the direction in which the cutting insert 1 moves toward the workpiece 20 is defined as the cutting direction D. c， That is, the direction of the cutting part 100 at one end toward the flank face 121 of the cutting part 100; the direction opposite to the cutting direction is the rearward direction D. B D c With D B The directions are opposite; and the left direction of the cutting part 100 is defined as D. L And the right direction is D R The direction of the cutting insert 10 from the lower positioning surface 220 to the upper positioning surface 210 is defined as the upward direction D. U D U The opposite direction is downward D. D .

[0048] like Figure 2-4 As shown, the rake face 110 of the cutting part 100 is located on the upper surface of the cutting part 100 (i.e., along D). U The outermost surface in the direction), and the flank face 121 is located on the front surface of the cutting section 100 (i.e., along D). c (The outermost surface in the direction). In the field of cutting tool technology, those skilled in the art generally refer to the two surfaces adjacent to both sides of the cutting edge 150 as the rake face 110 and the flank face 121. This is the conventional terminology in the field and will not be elaborated further here.

[0049] It should be noted that the cutting direction is defined in this article as the direction in which the cutting part 100 of the cutting insert 10 moves toward the workpiece 20. The definition of each direction of the cutting insert 10 in this article is based on the cutting direction. The definitions of other directions are only for the convenience of understanding and are marked according to the accompanying drawings of the embodiments. The terms "up", "down", "left", "right" and other terms used in this article are only used according to the description of the current illustration and are not intended to limit or restrict them. As is well known, the cutting insert 10 can also be used upside down, and the description of the up, down and left and right directions will change after it is used upside down.

[0050] Currently, to address the challenges of parting and grooving machining, manufacturers on the market typically employ straight or curved cutting edges combined with their respective chip breaker grooves, focusing on ensuring edge strength and chip removal. However, in high-speed feed machining, the chips are thicker, the cutting forces are greater, and more cutting heat is generated. Existing traditional cutting inserts are insufficient to meet the requirements for edge strength, heat dissipation, and chip removal under high-speed feed machining conditions.

[0051] Therefore, this application provides a cutting insert 10 for high-speed feed to meet the machining requirements of such working conditions:

[0052] This application provides as follows: Figure 14 The embodiment shows a cutting tool including a tool body 30 and a cutting insert 10 for cutting and machining a workpiece 20, the cutting insert 10 being mounted on the tool body 30. The cutting tool utilizes the rotation of the tool body 30 to drive the cutting insert 10 in cutting motion by mounting the cutting insert 10 on the tool body 30.

[0053] This application embodiment improves the cutting blade 10 as follows:

[0054] This application provides embodiments such as Figure 1-3 An embodiment of a cutting insert 10 is shown, the cutting insert 10 including a base portion 200 and a cutting portion 100 connected to the base portion 200; wherein, as Figure 1-3 , Figure 5-6 As shown, in this embodiment, the base portion 200 includes an upper positioning surface 210 for the cutting tool, a lower positioning surface 220 for the cutting tool, and two side support surfaces 230 for the cutting tool connecting the upper positioning surface 210 and the lower positioning surface 220. The cutting portion 100 is connected to the end of the base portion 200. The cutting portion 100 includes a rake face 110, a flank face 121 connecting the rake face 110, and two side flank faces 131 for connecting the rake face 110 and the flank face 121; wherein, a cutting edge 150 is formed at the intersection of the rake face 110 and the flank face 121; and a chip groove 140 is provided on the rake face 110.

[0055] To address the shortcomings of conventional cutting inserts, this application presents an innovative design for the cutting section 100: Please refer to... Figure 3 and Figure 4 A central rake angle face 141 is provided in the chip groove 140 near the cutting edge 150. The central rake angle face 141 forms a positive rake angle with the horizontal plane. The width of the central rake angle face 141 is smaller than the width of the cutting edge 150. A negative chamfer face 111 is provided at the intersection of the rake face 110 and the flank face 121. The negative chamfer face 111 includes a narrow negative rake angle face 1111 formed by extending from the central rake angle face 141 to the cutting edge 150 and a widened negative rake angle face 1112 formed by extending from the narrow negative rake angle face 1111 towards the flank face 131. The cutting edge 150 includes a narrow front sub-edge 151 formed by the narrow negative rake angle face 1111 and the flank face 121 and a wide front sub-edge 152 formed by the widened negative rake angle face 1112 and the flank face 121.

[0056] When the cutting insert 10 of this embodiment is mounted on the tool body 30 for use, the cutting part 100 moves along the cutting direction D. c The workpiece 20 is processed, and the specific process and principle are as follows:

[0057] like Figure 2-4 , Figure 11-13 As shown, the cutting tip of the cutting insert 10 provided in this embodiment is a special negative chamfer 111, i.e., the cutting edge 150. The middle part of the negative chamfer 111 is connected to the central rake angle 141 which forms a positive front angle with the horizontal plane, so that the negative chamfer 111 is a narrow negative rake angle 1111 in the middle. At the same time, the narrow negative rake angle 1111 extends and widens towards the side rear face 131 to form a widened negative rake angle 1112, thereby forming a front narrow sub-edge 151 and a front wide sub-edge 152 at the cutting edge 150 of the cutting insert 10. On the one hand, during the cutting process of the cutting insert 10, this structure will generate an inward squeezing pressure on the cutting flow pattern due to the change in the contact length between the middle position and the two sides of the cutting edge 150, thereby causing the chips to curl and improving the chip curling effect of the cutting insert 10.

[0058] Furthermore, the central rake face 141 forms a positive front angle with the horizontal plane. Through the compression of the cutting edge and the special chip-forming structure formed by the negative chamfer 111 and the central rake face 141, the central rake face 141 cooperates with the aforementioned front narrow sub-cutting edge 151 and front wide sub-cutting edge 152, and the generated chips roll towards the center and enter the central rake face 141 and the chip groove 140 in sequence, thereby improving the chip rolling and chip removal effect of the cutting insert 10.

[0059] Meanwhile, due to the presence of the widened negative rake angle face 1112 and the narrow negative rake angle face 1111 of the negative chamfer face 111, the cutting edge 150 is not only changed from being subjected to straight edge force to being subjected to face edge force, reducing the force per unit area of ​​the cutting edge 150 and effectively improving the tip strength of the cutting insert 10 under high-speed feed conditions, but also enables the cutting edge 150 to have a larger heat dissipation area to improve heat dissipation efficiency.

[0060] On the other hand, the narrow negative front angle face 1111 faces the rearward direction D. B It extends and connects with the central rake angle face 141, and the central rake angle face 141 forms a positive front angle with the horizontal plane; the narrow negative rake angle face 1111 and the central rake angle face 141 together form a cutting edge structure that is sharper than the widened negative rake angle face 1112 on the side, which improves the sharpness of the front narrow sub-cutting edge 151 at the middle position of the cutting edge 150. Under high feed conditions, it can effectively reduce the cutting force, improve the cutting edge strength, and improve the cutting efficiency.

[0061] It should be noted that the narrowness and width of the narrow negative front angle surface 1111 and the widened negative front angle surface 1112 in the embodiments of this application are relative, that is, the narrow negative front angle surface 1111 is in D B The dimension in the direction is smaller than the widened negative front angle face 1112.

[0062] Optionally, the length L2 of the widened negative rake angle face 1112 is equal to the width W of the cutting edge 150. c The relationship is L2 = W C / 10+λ, where λ is greater than or equal to 0.1mm, and the theoretical upper limit of λ is the width W of the cutting edge 150. C In practical applications, the value of λ can be set between 0.1 mm and 0.3 mm.

[0063] This design, by controlling the length L2 of the widened negative rake angle face 1112 within the aforementioned range, ensures that the cutting edge 150 of the cutting insert 10 has sufficient strength, and also ensures that the cutting insert 10 achieves stable and reasonable chip curling within a reasonable machining feed range. The specific values ​​of the above parameters can be adjusted by those skilled in the art according to actual needs and machining objectives using the above formulas, and no restrictions are imposed here.

[0064] For example, in this embodiment, the length L1 of the narrow negative front corner face 1111 is greater than or equal to 0.05 mm and less than or equal to 0.18 mm; for example, the length L2 of the widened negative front corner face 1112 is greater than or equal to 0.3 mm and less than or equal to 1.0 mm.

[0065] It should be noted that: such as Figure 8 As shown in the figure, in this paper, the cutting direction D is used. c Or D BThe direction of the line in question is taken as the direction of the measured length, with D as the reference. R Or D L The direction of the line in question is used as the direction for measuring the width.

[0066] In this paper, the length L2 of the widened negative rake angle face 1112 is defined as follows: with the cutting direction D c Or D B The direction of the line in question is used as the direction for measuring the length. The negative front angle face 1112 is widened according to D. D When projecting the direction, the distance between the side edge of the widened negative rake face 1112 near the back blade face 121 (i.e., the front widening sub-blade 152) and the side edge of the widened negative rake face 1112 near the front blade face 110 (i.e., the edge of the widened negative rake face 1112 near the front blade face 110, which in this embodiment is the intersection of the widened negative rake face 1112 and the side reinforcing arm 112).

[0067] The length L1 of the narrow negative rake face 1111 is defined as the distance between the side edge of the narrow negative rake face 1111 near the back face 121 (i.e., the front narrow sub-edge 151) and the side edge of the narrow negative rake face 1111 near the central rake face 141 (i.e., the intersection of the narrow negative rake face 1111 and the central rake face 141).

[0068] The width W of the cutting edge is 150. c The definition is: using D R Or D L The direction of the line in which it is located is used as the direction for measuring its width, and the cutting edge is 150 according to D. D When projecting the direction, the distance between the two outermost endpoints of the cutting edge 150 (which can also be described as the distance between the outermost two sides of the negative chamfer 111).

[0069] Optionally, the width W of the front narrow sub-blade 151 z Greater than or equal to 0.3W C And less than or equal to 0.8W C .

[0070] Due to the narrow negative rake angle face 1111 and the central rake angle face 141, they form a cutting edge structure that is sharper than the widened negative rake angle face 1112 on the side. This effectively reduces cutting force, increases cutting strength, and improves cutting efficiency under high feed conditions. The width W of the narrow front sub-edge 151 is set. z Greater than or equal to 0.3W C And less than or equal to 0.8W CThis further ensures a sufficiently long and sharper cutting edge structure, thereby further improving the cutting strength and efficiency of the cutting insert 10 under high feed conditions. The specific values ​​of the above parameters can be adjusted by those skilled in the art according to actual needs and machining objectives using the above formulas; no restrictions are imposed here.

[0071] Among them, the width W of the front narrow sub-blade 151 z The definition is: using D R Or D L The direction of the straight line where it is located is used as the direction for measuring its width, and the front narrow sub-blade 151 is pressed by D. D When projecting the direction, the distance between the two endpoints of the front narrow sub-edge 151 (i.e., the distance between the outermost two sides of the narrow negative front angle face 1111, which can also be called the distance between the two intersection points of the narrow negative front angle face 1111 and the central front angle face 141) is calculated based on the width W of the front narrow sub-edge 151. z From the definition of the width of the front cutting edge 152, we can see that the width W of the cutting edge 150 is... C Equal to the width W of the front narrow sub-blade 151 z The width of the front wide sub-blade 152 can be determined by the sum of the widths of the two front wide sub-blades 152 and the front narrow sub-blade 151W. z get.

[0072] Optionally, such as Figure 12-13 As shown, the angle between the negative chamfered face 111 and the horizontal plane is ε, where ε is greater than or equal to 5° and less than or equal to 15°. Optionally, the angle between the central front corner face 141 and the horizontal plane is δ, where δ is greater than or equal to 15° and less than or equal to 30°.

[0073] The narrow negative rake angle 1111 and the widened negative rake angle 1112 of the negative chamfer 111 form a narrow front sub-edge 151 and a wide front sub-edge 152 at the cutting edge 150. During cutting, this structure causes the chip to curl due to the change in contact length between the middle and sides of the cutting edge 150. In addition, the special chip-forming structure formed by the cutting edge compression and the central rake angle 141 of the negative chamfer 111 is beneficial to improving the chip curling and chip removal effect of the cutting insert 10. The angle ε between the negative chamfer 111 and the horizontal plane is set within the range mentioned above, which can further promote chip curling and ensure that the cutting insert 10 has a better chip curling effect.

[0074] During cutting, the presence of the widened negative rake angle 1112 and the narrow negative rake angle 1111 of the negative chamfer 111 effectively improves the tip strength of the cutting insert 10 under high-speed feed conditions, and also allows the cutting edge 150 to have a larger heat dissipation area. Furthermore, the narrow negative rake angle 1111 and the central rake angle 141 together form a cutting edge structure that is sharper than the widened negative rake angle 1112 on the side, improving the sharpness of the narrow front cutting edge 151. The angle ε between the negative chamfer 111 and the horizontal plane and the angle δ between the central rake angle 141 and the horizontal plane, set within the above range, further ensure the tip strength and heat dissipation effect of the cutting edge 150 under high feed conditions, improving the cutting edge strength and increasing cutting efficiency.

[0075] Optionally, the chip groove 140 is provided with a first chip-rolling inclined surface 142 in the direction near the side rake face 131; the first chip-rolling inclined surface 142 is connected to the central rake face 141 and the widened negative rake face 1112 respectively, and the width of the chip groove 140 gradually decreases along the direction from the rake face 110 to the bottom of the chip groove 140 due to the first chip-rolling inclined surface 142.

[0076] like Figure 3-4 , Figure 7 , Figure 9 As shown in the embodiment, during cutting, the cutting insert 10 generates chips that curl towards the center through the compression of the cutting edge and the special chip-forming structure formed by the negative chamfer surface 111 and the central rake face 141. The chips then smoothly enter the first chip-curling inclined surface 142 and the central rake face 110. The first chip-curling inclined surface 142 is designed to further curl the chips, preventing them from scratching the surface of the workpiece 20. At the same time, it allows the chips to smoothly enter the chip groove 140 along the central rake face 141, thereby improving the chip curling, chip wrapping, chip breaking, and chip removal effects of the cutting insert 10.

[0077] Optionally, the chip groove 140 is further provided with a second chip-coiling inclined surface 143 and a connecting arm 144 in the direction near the side relief face 131; the second chip-coiling inclined surface 143 and the connecting arm 144 are connected to the first chip-coiling inclined surface 142, and the connecting arm 144 is located between the second chip-coiling inclined surface 143 and the anti-chip surface 145 at the bottom of the chip groove 140. Optionally, as... Figure 9-10 As shown, the included angle between the two first chip-rolling inclined surfaces 142 is α, the included angle between the two second chip-rolling inclined surfaces 143 is β, β is greater than or equal to α, and the included angle between the connecting arm 144 and the anti-chip surface 145 is γ, 180°-2γ is less than α. For example, α is greater than or equal to 140° and less than or equal to 160°; β is greater than or equal to 160° and less than or equal to 170°; and γ is greater than or equal to 30° and less than or equal to 60°.

[0078] like Figure 3-4 , Figure 7 , Figure 10As shown, after passing through the first chip incline 142, the chips enter the area where the second chip incline 143 and the connecting arm 144 are located. The second chip incline 143 and the connecting arm 144 are connected to the first chip incline 142. The connecting arm 144 is located between the second chip incline 143 and the anti-chip surface 145 at the bottom of the chip groove 140. This structural design promotes the chips to curl further towards the center. In addition, the angle between the connecting arm 144 and the anti-chip surface 145 is γ. Furthermore, it is set to 180°-2γ<α, so that the chips entering it curl further towards the center.

[0079] Meanwhile, to prevent chips from shifting to the side during cutting and to keep them curled in the middle of the chip groove 140, two second chip-coiling inclined surfaces 143 are used to connect the side reinforcing arm 112 and the connecting arm 144. The included angle β > α between these chip-coiling surfaces is designed to adjust and correct the chip curling, thereby improving the surface quality of the workpiece machined by the cutting insert 10. In summary, the structural design of the first chip-coiling inclined surface 142, the second chip-coiling inclined surface 143, and the connecting arm 144 effectively improves the chip curling, chip wrapping, chip breaking, and chip removal effects of the cutting insert 10, thus improving the surface quality of the workpiece machined by the cutting insert 10.

[0080] Optionally, the front face 110 is provided with a side reinforcing arm 112 at the intersection of it and the side rear face 131; the side reinforcing arm 112 is connected to the second chip spooling surface 143, one side of the side reinforcing arm 112 is connected to the widened negative front angle surface 1112, the other side of the side reinforcing arm 112 extends toward the base portion 200, and the middle position of the side reinforcing arm 112 is recessed inward to form an arc-shaped surface structure.

[0081] like Figure 3-4 , Figure 7 As shown, the cutting part 100 has side reinforcing arms 112 on both the left and right sides. The side reinforcing arms 112 are recessed inward to form an arc-shaped surface structure, that is, they face downward in the direction D. D The concave shape forms an arc-shaped surface structure; the side reinforcement arm 112 with this structural design can effectively improve the side strength of the cutting tool 10, avoid side chipping under high-speed feed cutting and grooving conditions, and improve the service life of the tool.

[0082] For example, such as Figure 11 As shown, in this embodiment, the side reinforcing arm 112 is recessed inward to form a C-shaped curved surface structure, from D... R When viewed from the projection direction, it appears as a C-shaped curl.

[0083] Optionally, such as Figure 8 As shown, the width of the side reinforcing arm 112 is the side arm width W. B Side arm width W B Width W of the cutting edge 150 c The relation is KCB =W C / W B , where K CB Greater than or equal to 15 and less than or equal to 30.

[0084] Side arm width W B By using the above range setting, the side arm width W can be guaranteed. B Sufficiently wide to further and effectively enhance the side strength of the cutting insert 10. Regarding the above parameters W... B、 K CB The specific values ​​can be adjusted by those skilled in the art according to actual needs and processing objectives using the above formula, and no restrictions are imposed here.

[0085] Among them, such as Figure 3-4 , Figure 8 As shown, the side arm width W B The definition is: using D R Or D L The direction of the straight line where it is located is used as the direction for measuring its width, and the side reinforcing arm 112 is set according to D. D When projecting the direction, the distance between the side edge of the side reinforcing arm 112 near the side rear cutting face 131 (i.e., the side sub-cutting edge 132) and the side edge of the side reinforcing arm 112 near the second chip sloping surface 143 (i.e., the intersection of the side reinforcing arm 112 and the second chip sloping surface 143).

[0086] Optionally, the chip-reversing surface 145 is a curved surface structure recessed into the cutting portion 100, that is, the chip-reversing surface 145 is a curved surface structure recessed into the cutting portion 100. D A concave curved surface structure;

[0087] like Figure 3 As shown, the chips are finally formed into disc-shaped, C-shaped, or 6-shaped chips by passing through the anti-chip surface 145 preset at the rear of the chip groove 140. The curvature of the anti-chip surface 145 can be designed differently to affect the curling degree of the chips during cutting, thus affecting the chip breaking effect and obtaining the desired chip shape. The specific values ​​of the curvature parameters of the anti-chip surface 145 can be adjusted by those skilled in the art according to actual needs and processing objectives, and are not limited here.

[0088] Optionally, the cutting section 100 further includes a front support surface 120 located at the bottom of the rake face 110; the front support surface 120 extends downward along the bottom of the flank face 121, i.e. towards D. D The direction extends; wherein, the back face 121 is an inclined surface extending from the negative chamfer face 111 in the downward and inward directions, that is, it extends along the downward direction D. D and backward direction D B extend.

[0089] Optionally, the cutting portion 100 also includes a side surface 130 located at the bottom of the side relief face 131; the side surface 130 extends downward along the bottom of the side relief face 131, i.e. towards D. D The direction extends; wherein, the side rear blade face 131 is an inclined surface extending downward and inward from the side reinforcing arm 112, that is, the side surface 130 on the left side extends downward in the direction D. D and to the right D R Extending, located on the right side 130 along the downward direction D D and to the right D L extend.

[0090] Optionally, a side sub-cutting edge 132 is formed at the intersection of the side surface 130 and the negative chamfer surface 111, and the intersection angle between the front wide sub-cutting edge 152 and the side sub-cutting edge 132 is formed by a rounded transition to form a blade tip arc 133. For example, the radius R of the blade tip arc 133 is greater than or equal to 0.2 mm and less than or equal to 0.4 mm.

[0091] For the base portion 200:

[0092] The base portion 200 includes an upper positioning surface 210 for the blade, a lower positioning surface 220 for the blade, and two blade-side support surfaces 230 connecting the upper positioning surface 210 and the lower positioning surface 220 for the blade.

[0093] For cutting tools:

[0094] like Figure 2 The cutting tool shown in the embodiment includes a tool body 30 and a cutting insert 10 for machining a workpiece 20, the cutting insert 10 being mounted on the tool body 30. Optionally, the tool body 30 has a clamping portion, and the cutting insert 10 has a positioning structure for clamping and positioning the cutting insert 10 on the clamping portion of the tool body 30. It should be noted that, in specific applications, the tool body 30 may be provided with one or more clamping portions, and the cutting inserts 10 mounted on each clamping portion may be of the same type and structure, or they may be different.

[0095] The cutting tool of this application has the technical effects of the cutting insert 10 described above, which will not be repeated here.

[0096] It should be noted that:

[0097] like Figure 5 As shown, in this embodiment of the application, the cutting blade 10 is positioned along D at its central location. L -D RThe cutting portions 100 are symmetrically arranged at both ends of the base portion 200, which is perpendicular to the plane of the paper. The cutting blade 10 shown in this embodiment is only a preferred embodiment of this application and is not intended to limit this application in any way. The cutting portions 100 of this application may not be symmetrical along the center line of the base portion 200, and are not limited to providing two cutting portions 100.

[0098] Understandably, the cutting blade shown in this embodiment and its accompanying drawings is only an example. In this embodiment, the base portion 200 adopts a rectangular parallelepiped-shaped "I" structure, and the cutting portion 100 is disposed at both ends of the base portion 200. Based on the above design concept, and based on the structure and usage of the cutting portion 100, the base portion 200 can also adopt other structural designs, and the number of cutting portions 100 can be adjusted on the base portion 200 with different structures. For example, the base portion 200 adopts a cross-shaped structure or an L-shaped structure, and the cutting portion 100 is disposed at the end of the base portion 200, including but not limited to the scheme shown in the first embodiment.

[0099] In some implementations, the cutting insert 10 may be made of a cemented carbide substrate, and optionally, various functional or decorative coatings may be applied to the surface of the cutting insert 10 to improve its performance.

[0100] Furthermore, those skilled in the art should understand that although many problems exist in the prior art, each embodiment or technical solution of this application can be improved in only one or a few aspects, without necessarily solving all the technical problems listed in the prior art or background art simultaneously. Those skilled in the art should understand that any content not mentioned in a claim should not be construed as a limitation on that claim.

[0101] Although terms such as cutting portion, base portion, and negative chamfer surface are frequently used herein, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this application; interpreting them as any additional limitation would contradict the spirit of this application. The terms "first," "second," etc. (if present) in the description, claims, and accompanying drawings of the embodiments of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A cutting blade, comprising a base portion (200) and a cutting portion (100) connected to the base portion (200); characterized in that: The cutting part (100) includes a rake face (110), a flank face (121) connecting the rake face (110), and two side flank faces (131) for connecting the rake face (110) and the flank face (121). Wherein, the cutting edge (150) is formed at the intersection of the rake face (110) and the flank face (121); the rake face (110) is provided with a chip groove (140), and the chip groove (140) is provided with a central rake angle face (141) in the direction close to the cutting edge (150). The central rake angle face (141) forms a positive rake angle with the horizontal plane, and the width of the central rake angle face (141) is smaller than the width of the cutting edge (150); The rake face (110) has a negative chamfer (111) at its intersection with the flank face (121). The negative chamfer (111) includes a narrow negative rake angle (1111) formed by extending from the central rake angle (141) to the cutting edge (150) and a widened negative rake angle (1112) formed by extending from the narrow negative rake angle (1111) toward the side flank face (131). The cutting edge (150) includes the narrow negative rake angle... (1111) A narrow front cutting edge (151) formed by connecting with the back cutting edge (121) and a wide front cutting edge (152) formed by connecting the widened negative rake angle surface (1112) with the back cutting edge (121); the angle between the negative chamfer surface (111) and the horizontal plane is ε, where ε is greater than or equal to 5° and less than or equal to 15°; the angle between the central rake angle surface (141) and the horizontal plane is δ, where δ is greater than or equal to 15° and less than or equal to 30°; The chip groove (140) is provided with a first chip-rolling inclined surface (142) in the direction near the side back face (131); the first chip-rolling inclined surface (142) is connected to the central front angle face (141) and the widened negative front angle face (1112) respectively, and the width of the chip groove (140) gradually decreases along the direction from the front face (110) to the bottom of the chip groove (140); the chip groove (140) is also provided with a second chip-rolling inclined surface (143) and a connecting arm (144) in the direction near the side back face (131); the second chip-rolling inclined surface and the connecting arm (144) are connected to the first chip-rolling inclined surface (142), and the connecting arm (144) is located between the second chip-rolling inclined surface (143) and the anti-chip surface (145) at the bottom of the chip groove (140).

2. The cutting blade according to claim 1, characterized in that: The length L2 of the widened negative rake face (1112) and the width W of the cutting edge (150) c The relationship is L2=W C / 10+λ, where λ is greater than or equal to 0.1 mm.

3. The cutting blade according to claim 1, characterized in that: The width W of the front narrow sub-blade (151) z Greater than or equal to 0.3W C And less than or equal to 0.8W C .

4. The cutting blade according to claim 1, characterized in that: The length L1 of the narrow negative front angle face (1111) is greater than or equal to 0.05 mm and less than or equal to 0.18 mm; And / or, the length L2 of the widened negative front angle face (1112) is greater than or equal to 0.3 mm and less than or equal to 1.0 mm.

5. The cutting blade according to claim 1, characterized in that: The front cutting face (110) is provided with a side reinforcing arm (112) at the position where it intersects with the side rear cutting face (131). The side reinforcing arm (112) is connected to the second chip slope (143). One side of the side reinforcing arm (112) is connected to the widened negative front angle surface (1112). The other side of the side reinforcing arm (112) extends toward the base part (200), and the middle position of the side reinforcing arm (112) is recessed inward to form an arc-shaped surface structure.

6. The cutting blade according to claim 5, characterized in that: The included angle between the two first chip inclines (142) is α, and the included angle between the two second chip inclines (143) is β; the β is greater than or equal to the α, and the included angle between the connecting arm (144) and the anti-chip surface (145) is γ, the value of 180°-2γ is less than the α; The α is greater than or equal to 140° and less than or equal to 160°; the β is greater than or equal to 160° and less than or equal to 170°; the γ is greater than or equal to 30° and less than or equal to 60°.

7. A cutting tool, characterized in that: It includes a tool body (30) and a cutting blade (10) as claimed in any one of claims 1-6, the cutting blade (10) being mounted on the tool body (30).

Images