Cutting structure and round nose knife

Abstract

The cutting structure comprises at least one cutting edge, each cutting edge is provided with a bottom edge, a circumferential edge and a transition edge, the transition edge is connected with the bottom edge and the circumferential edge, the transition edge comprises an arc section and an oblique line section connected with the arc section, and the oblique line section is connected with the arc section. One of the circular arc section and the oblique line section is connected with the bottom blade, and the other one of the circular arc section and the oblique line section is connected with the circumferential blade. According to the cutting structure and the round nose knife, the stress of the transition blade can be improved, cutting heat and abrasion are reduced, the defects of chip adhesion, abrasion, chipping and the like are reduced, and the service life of the knife is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of cutting tools, in particular to a cutting structure and a round nose cutter. Background Art

[0002] A round nose cutter is a milling cutter having multiple spiral cutting edges. The spiral cutting edges have a bottom edge, a peripheral edge, and a transition edge. The bottom edge is located at the end of the milling cutter, the peripheral edge is located on the radial outer surface of the milling cutter, and the transition edge connects the bottom edge and the peripheral edge.

[0003] Among them, the transition edge is mostly R angle, and the radius of the R angle is much smaller than the radius of the milling cutter, which makes the round nose cutter distinguishable from the ball cutter.

[0004] Due to the development of new technologies, difficult-to-process composite materials such as titanium alloys and titanium-aluminum alloys are widely used, making it very easy for defects such as chip sticking, wear and chipping to occur at the transition edge. In turn, the processing resistance increases, a large amount of heat is generated, and the tool is very likely to fail. Utility Model Content

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a cutting structure that can improve the force applied to the transition edge, reduce cutting heat and wear, and reduce the occurrence of defects such as chip sticking, wear, and chipping, thereby extending the service life of the tool.

[0006] The utility model also provides a round nose knife with the above cutting structure.

[0007] According to a cutting structure of the first aspect embodiment of the present utility model, the cutting edge includes at least one cutting edge, the cutting edge having a bottom edge, a peripheral edge and a transition edge, the transition edge connecting the bottom edge and the peripheral edge, the transition edge including an arc segment and an oblique line segment connecting the arc segments, one of the arc segment and the oblique line segment is connected to the bottom edge, and the other of the arc segment and the oblique line segment is the peripheral edge.

[0008] A cutting structure according to an embodiment of the present invention has at least the following beneficial effects:

[0009] The utility model can shorten the profile length of the transition edge by arranging the oblique line segment, reduce friction, reduce cutting heat and wear, reduce the occurrence of defects such as chip sticking, wear and chipping, and extend the service life of the tool.

[0010] The utility model provides oblique line segments, so that during cutting, the oblique line segments can generate radial force and axial force, avoid stress concentration, reduce wear and chipping, extend the service life of the tool, or increase the cutting allowance and improve processing efficiency.

[0011] The utility model also provides a round nose knife, which has the above beneficial effects.

[0012] According to a cutting structure of an embodiment of the first aspect of the present utility model, the oblique line segment connects the peripheral edge, and the angle between the oblique line segment and the peripheral edge is 11°; or, the oblique line segment connects the bottom edge, and the angle between the oblique line segment and the bottom edge is 11°.

[0013] Advantageously, the present invention satisfies the need for stress dispersion while avoiding excessive reduction of the transition edge profile, tool strength, and root or corner clearing effects by setting the included angle between the oblique line segment and the connected peripheral edge or bottom edge to 11°.

[0014] According to a cutting structure of an embodiment of the first aspect of the present utility model, on two adjacent cutting edges, the oblique line segment of one cutting edge is connected to the bottom edge, and the oblique line segment of the other cutting edge is connected to the peripheral edge.

[0015] What is beneficial is that: the utility model connects the oblique line segment of one cutting edge to the bottom edge, and the oblique line segment of another cutting edge to the peripheral edge, so that the oblique line segments of adjacent cutting edges are reversed and staggered to achieve a staggered edge arrangement, and then, the processing amount of the arc segment of a cutting edge is the geometric difference between the arc segment and the oblique line segment. The geometric difference refers to the area enclosed by the arc segment and the oblique line segment when the two cutting edges rotate along the center of the tool and overlap together, thereby reducing the processing allowance of the transition edge, making the cutting process smooth, and slowing down the wear of the transition edge, reducing the occurrence of defects. The transition edge is the position where the tool is most likely to have defects. Therefore, the wear resistance and collapse resistance of the tool are greatly improved, and the service life of the tool is greatly extended.

[0016] According to a cutting structure of an embodiment of the first aspect of the present invention, the arc segment has a first rake face, and the cutting structure further includes a tool groove, which is connected to the peripheral edge, and a sub-groove is provided between the first rake face and the tool groove.

[0017] The benefit is that: the utility model provides a sub-groove, thereby replacing the original single rake face structure for the transition edge, removing the convex edge at the connection between the first rake face and the groove, facilitating the entry of chips into the groove, reducing the contact between chips and the convex edge, and reducing friction and wear.

[0018] According to a cutting structure of an embodiment of the first aspect of the present invention, the rake angle of the sub-groove is 10 to 14°.

[0019] The benefit is that: by making the sub-groove adopt a rake angle of 10 to 14 degrees, the utility model can make the edge shape of the connection between the transition edge and the peripheral edge sharp, improve the cutting performance, avoid insufficient cutting force causing a sharp increase in cutting heat, protect the tool and processing material, and avoid the tool and processing material from softening rapidly and causing problems such as chip sticking and high temperature diffusion.

[0020] According to a cutting structure of an embodiment of the first aspect of the present utility model, a back width of the bottom edge is 0.1D, D is the tool radius, a back angle of the bottom edge is 6 to 12°, a second back angle of the bottom edge is 18 to 26°, and a front angle of the bottom edge is 0 to 6°.

[0021] Advantageously, the present invention ensures that the bottom edge has sufficient strength and reduces wear during use by adopting a first clearance angle of 6 to 12°, a second clearance angle of 18 to 26°, and a front angle of 0 to 6°.

[0022] According to a cutting structure of an embodiment of the first aspect of the present utility model, a rear width of the peripheral blade is 0.17D, a rear angle of the peripheral blade is 8 to 12°, two rear angles of the peripheral blade are arc rear angles, and a front angle of the peripheral blade is 3 to 6°.

[0023] The benefit is that: the utility model adopts a back angle of 8 to 12° and two back angles in the form of an arc and a front angle of 3 to 6°, which can not only have good cutting performance but also protect the peripheral edge, so that the tool has good wear resistance and anti-breakage performance during both rough machining and fine machining, and is particularly suitable for the processing of composite materials such as titanium and aluminum that have a tendency to stick to chips.

[0024] According to a cutting structure of an embodiment of the first aspect of the present invention, the cutting structure is a spiral cutter, and the helix angle of the cutting structure is 38°.

[0025] Advantageously, the present invention can improve chip removal, facilitate chip discharge, and reduce friction between chips and peripheral cutting edges by adopting a larger helix angle of 38°, thereby making the tool have good wear resistance and anti-breakage performance.

[0026] According to a cutting structure of an embodiment of the first aspect of the present utility model, the number of the cutting edges is four, and the four cutting edges are arranged in a 7° unequal tooth pitch structure.

[0027] The benefit is that: by adopting a 4-edge tool groove structure, the utility model can increase the number of cutting edges, reduce the cutting amount and wear of each cutting edge, and thus, can use a larger feed to improve the cutting efficiency of the tool, or maintain the original feed amount to extend the service life of the tool.

[0028] The utility model arranges the four cutting edges into a 7° unequal pitch structure, which can improve vibration during the processing, enhance processing quality and efficiency, and extend the service life of the tool.

[0029] A round nose knife according to the second embodiment of the present invention includes the above-mentioned cutting structure.

[0030] Advantageously, the round nose cutter of the present invention can form a high-efficiency staggered-edge round nose cutter by applying the above-mentioned cutting structure, which is particularly suitable for processing difficult-to-process composite materials such as titanium and aluminum.

[0031] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 these drawings without paying any creative work.

[0033] Figure 1 A schematic structural diagram of a round nose cutter with a cutting structure according to an embodiment of the present invention;

[0034] Figure 2 for Figure 1 Schematic diagram of the cross section of the blade groove of a round nose knife;

[0035] Figure 3 for Figure 1 Schematic diagram of the structure of the bottom blade of a round nose knife;

[0036] Figure 4 for Figure 1 Schematic diagram of the structure of the peripheral blade of a round nose knife;

[0037] Figure 5 for Figure 1 Schematic diagram of the arrangement of one cutting edge of a round nose knife;

[0038] Figure 6 for Figure 1 Schematic diagram of the arrangement of another cutting edge of the round nose knife;

[0039] Figure 7 for Figure 1 A three-dimensional diagram of a cutting edge of a round nose knife;

[0040] Figure 8 for Figure 1Schematic diagram of the cutting allowance of the four cutting edges of a round nose cutter in a staggered arrangement.

[0041] Reference numerals: 100 - bottom edge, 110 - peripheral edge, 120 - transition edge, 130 - arc segment, 140 - oblique line segment, 150 - first rake face, 160 - groove, 170 - sub-groove. DETAILED DESCRIPTION

[0042] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0043] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0044] In the description of this utility model, "several" means one or more, "more" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. If a first or second is mentioned, this is solely for the purpose of distinguishing the technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0045] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted, connected, and connected" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0046] A cutting structure and a round nose cutter according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0047] The utility model aims to provide an embodiment of a cutting structure, which can be applied to spiral cutting tools such as round nose cutters, and can also be applied to other cutters such as disc cutters according to actual needs.

[0048] Reference Figures 1 to 7The utility model provides an embodiment of a round nose knife using the cutting structure. At the same time, combined with the characteristics of the cutting structure, the round nose knife of the utility model can also be called a high-efficiency staggered-edge round nose knife, which is particularly suitable for processing difficult-to-process composite materials such as titanium and aluminum.

[0049] Reference Figure 2 In this embodiment, the round nose cutter has four cutting edges.

[0050] It is easy to understand that this embodiment, by adopting a 4-edge tool groove 160 structure, can increase the number of cutting edges and reduce the cutting amount and wear of each cutting edge. Furthermore, a larger feed can be used to improve the cutting efficiency of the tool, or the original feed rate can be maintained to extend the service life of the tool.

[0051] In some specific embodiments of the present invention, the four cutting edges can be arranged in a 7° unequal pitch structure, that is, among the four evenly distributed cutting edges with an included angle of 90°, the included angle of one pair of cutting edges is adjusted to 97°, and the included angle of one pair of cutting edges is adjusted to 83°. For specific distribution, see Figure 2 .

[0052] It is easy to understand that this embodiment can improve vibration during the processing, enhance processing quality and efficiency, and extend the service life of the tool by arranging the four cutting edges into a 7° unequal pitch structure.

[0053] Specifically, the cutting force waveform can be changed so that the cutting force waveforms of each cutter tooth are no longer consistent, thereby dispersing the excitation energy, making it less likely to arouse vibration of the machine tool-tool-workpiece system, and improving the machining stability and workpiece surface quality.

[0054] By more effectively reducing vibration and controlling cutting forces, metal removal rates can be increased without sacrificing tool life, thereby improving productivity.

[0055] Since vibrations can be reduced more effectively, the cutting texture can be improved and the surface processing quality can be enhanced.

[0056] At the same time, tools with unequal tooth pitch structures can change the distribution of cutting force in the frequency domain, making the amplitude of cutting force at each frequency smaller, which helps to reduce tool wear and the risk of tool breakage.

[0057] For workpieces with complex geometries, the unequal pitch structure can better adapt to the dynamic changes in the cutting process and has good adaptability.

[0058] At the same time, due to the reduction of vibration and more even distribution of cutting forces, tools with uneven pitch structures generally have higher durability, which means that they can continue milling operations for longer, reducing the frequency and cost of tool replacement.

[0059] In some specific embodiments of the present invention, the helix angle of the round nose cutter can be 38°.

[0060] It is easy to understand that this embodiment can improve chip removal by adopting a larger helix angle of 38°, facilitate chip discharge, reduce the friction between the chips and the peripheral edge 110, and thus make the tool have good wear resistance and anti-breakage performance.

[0061] As for the chipping edge, the cutting edge has a bottom edge 100 , a peripheral edge 110 , and a transition edge 120 , which connects the bottom edge 100 and the peripheral edge 110 .

[0062] Reference Figure 3 In some specific embodiments of the present invention, the back width of the bottom blade 100 can be 0.1D, D is the tool radius, a back angle of the bottom blade 100 is 6 to 12°, a second back angle of the bottom blade 100 is 18 to 26°, and a front angle of the bottom blade 100 is 0 to 6°.

[0063] It is easy to understand that this embodiment ensures that the bottom blade 100 has sufficient strength and reduces wear during use by adopting a first clearance angle of 6 to 12 degrees, a second clearance angle of 18 to 26 degrees, and a front angle of 0 to 6 degrees.

[0064] Reference Figure 4 In some specific embodiments of the present invention, a rear width of the peripheral blade 110 can be 0.17D, a rear angle of the peripheral blade 110 can be 8 to 12°, two rear angles of the peripheral blade 110 can be arc rear angles, and a front angle of the peripheral blade 110 can be 3 to 6°.

[0065] It is easy to understand that this embodiment adopts a back angle of 8 to 12 degrees and two back angles in the form of arcs, which can not only have good cutting performance, but also protect the peripheral edge 110, so that the tool has good wear resistance and anti-collapse performance during both rough machining and fine machining, and is particularly suitable for the processing of composite materials such as titanium and aluminum that have a tendency to stick to chips.

[0066] In other words, the peripheral edge 110 of the tool adopts a single arc back angle structure, and at the same time, adopts an arc back angle of 8 to 12°, which not only has good cutting performance, but also can protect the cutting edge, so that the tool still has good wear resistance and fracture resistance during rough and fine processing, and is very suitable for the processing of composite materials such as titanium and aluminum that have a tendency to stick to chips.

[0067] The rake angle of the peripheral blade 110 can also be called the rake angle of the tool groove 160. The rake angle of the peripheral blade 110 is 3 to 6 degrees, which can meet the cutting sharpness requirements of most composite materials to the greatest extent, making the cutting edge of the peripheral blade 110 cut lightly and reducing heat generation.

[0068] In particular, when processing titanium-aluminum composite materials, it can effectively avoid chip sticking on the cutting edge and reduce the occurrence of cutting edge material peeling, cutting edge chipping and other phenomena.

[0069] At the same time, the use of a 0.6D core diameter structure can reduce the vibration and deflection of the tool during rough machining, thereby maximizing the overall rigidity of the tool, making the tool have both good rigidity and sufficient chip space.

[0070] Reference Figure 5 、 Figure 6 and Figure 7 For the transition edge 120 , the transition edge 120 includes an arc segment 130 and an oblique line segment 140 connecting the arc segment 130 , one of the arc segment 130 and the oblique line segment 140 is connected to the bottom edge 100 , and the other circumferential edge 110 in the arc segment 130 and the oblique line segment 140 .

[0071] It is easy to understand that, by providing the oblique line segment 140, this embodiment can shorten the profile length of the transition edge 120, reduce friction, reduce cutting heat and wear, reduce the occurrence of defects such as chip sticking, wear and chipping, and extend the service life of the tool.

[0072] It is easy to understand that in this embodiment, by setting the oblique line segment 140, during cutting processing, the oblique line segment 140 can generate radial and axial forces, avoid stress concentration, reduce wear and chipping, and extend the service life of the tool, or increase the cutting allowance and improve processing efficiency.

[0073] In some specific embodiments of the present invention, the oblique line segment 140 can be connected to the peripheral edge 110, and the angle between the oblique line segment 140 and the peripheral edge 110 is 11°, or the oblique line segment 140 can be connected to the bottom edge 100, and the angle between the oblique line segment 140 and the bottom edge 100 is 11°.

[0074] It is easy to understand that this embodiment satisfies the need for stress dispersion while avoiding excessive reduction in the profile of the transition edge 120 and tool strength by making the angle between the oblique line segment 140 and the connected peripheral edge 110 or bottom edge 100 11°, and does not affect the root cleaning or corner cleaning effect.

[0075] In some specific embodiments of the present invention, on two adjacent cutting edges, the oblique line segment 140 of one cutting edge may be connected to the bottom edge 100 , and the oblique line segment 140 of the other cutting edge may be connected to the peripheral edge 110 .

[0076] It is easy to understand that in this embodiment, the oblique line segment 140 of one cutting edge is connected to the bottom edge 100, and the oblique line segment 140 of the other cutting edge is connected to the circumferential edge 110, so that the oblique line segments 140 of adjacent cutting edges are reversed and staggered to achieve a staggered edge arrangement. Furthermore, the processing amount of the arc segment 130 of one cutting edge is made to be the geometric difference between the arc segment 130 and the oblique line segment 140. The geometric difference refers to the area enclosed by the arc segment 130 and the oblique line segment 140 when the two cutting edges rotate along the center of the tool and overlap together, thereby reducing the processing allowance of the transition edge 120, making the cutting process smooth, and slowing down the wear of the transition edge 120, thereby reducing the occurrence of defects. The transition edge 120 is also the position where defects of the tool are very likely to occur. Therefore, the wear resistance and collapse resistance of the tool are greatly improved, and the service life of the tool is greatly extended.

[0077] In this embodiment, the number of cutting edges is four, the oblique line segments 140 are arranged identically on two opposite cutting edges, and are arranged differently on two adjacent cutting edges, thereby achieving staggered edge arrangement.

[0078] Specifically, in order to effectively avoid problems such as chip sticking, rapid wear and chipping of the transition edge 120 caused by a sharp increase in processing heat at the transition edge 120, the profile of the transition edge 120 adopts a staggered edge structure that combines a carefully designed arc segment 130 and a slant line segment 140 with a small offset angle of 11°.

[0079] When the tool rotates for processing, the rotation profile of the transition edge 120 remains complete and no cutting is missed. At the same time, the oblique line segment 140 can generate axial and radial components of force, reducing the cutting force at the transition edge 120, thereby reducing the generation of cutting heat.

[0080] At the same time, due to the difference in the arrangement of the oblique line segment 140, the machining allowance left by the transition edge 120 of one cutting edge to the transition edge 120 of the other cutting edge is actually the maximum drop between the arc segment 130 and the oblique line segment 140. This maximum drop can be obtained by rotating the different cutting edges together and then measuring them through 2D or 3D drawings. Figure 8 Understand the margin A and margin B in.

[0081] Therefore, the machining allowance of the tool can be made more uniform, the cutting can be smoother, and the heat generated by the tool can be reduced very effectively. It can effectively reduce the problems caused by excessive heat, such as softening of the processed material, chip sticking and high-temperature diffusion, etc. At the same time, it is very beneficial to improve the tool's ability to resist wear and chipping.

[0082] In some specific embodiments of the present invention, the arc segment 130 may have a first rake face 150 , and the cutting structure may further include a tool groove 160 . The tool groove 160 is connected to the peripheral edge 110 , and a sub-groove 170 is provided between the first rake face 150 and the tool groove 160 .

[0083] It is easy to understand that this embodiment provides the sub-groove 170, thereby replacing the original single front cutting edge structure for the transition edge 120 and removing the convex edge at the connection between the first front cutting edge 150 and the tool groove 160, thereby facilitating the chips to enter the tool groove 160, reducing the contact between the chips and the convex edge, and reducing friction and wear.

[0084] In some specific embodiments of the present invention, the front angle of the sub-slot 170 can be set to 10 to 14 degrees.

[0085] It is easy to understand that in this embodiment, by making the sub-groove 170 adopt a rake angle of 10 to 14 degrees, the edge shape of the connection between the transition edge 120 and the peripheral edge 110 becomes sharp, thereby improving the cutting performance, avoiding insufficient cutting force and causing a sharp increase in cutting heat, protecting the tool and the processing material, and avoiding the rapid softening of the tool and the processing material, resulting in problems such as chip sticking and high-temperature diffusion.

[0086] In this embodiment, the front angle and the back angle can be determined by referring to the tool angle standard, which is common knowledge and will not be described in detail.

[0087] In this embodiment, in cases involving single-point numerical values, such as the angle between the oblique line segment 140 and the bottom edge 100 being 11°, the actual object may not be equal to 11° due to manufacturing errors and measurement errors. This should be determined based on the markings on the design drawings, which include 2D drawings and 3D drawings. Alternatively, the deviation range of the single-point numerical value can be determined based on unnoted tolerance standards to confirm whether the actual object falls within the protection range.

[0088] Throughout this specification, references to terms such as "one embodiment, some embodiments, exemplary embodiments, examples, specific examples, or some examples" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, illustrative uses of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0089] The terms "first, second, third, fourth," etc., as used in the specification and claims of this application and in the accompanying drawings, where applicable, are used to distinguish similar items and are not necessarily used to describe a particular order or sequential sequence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments described herein can be practiced in an order other than that shown or described herein.

[0090] It should also be noted that in the description of this specification, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0091] In addition, the terms "comprises" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may also include other steps or elements not explicitly listed or inherent to such process, method, product or apparatus.

[0092] Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed or inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0093] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A cutting structure comprising at least one cutting edge, wherein the cutting edge comprises a bottom edge (100), a peripheral edge (110) and a transition edge (120), wherein the transition edge (120) connects the bottom edge (100) and the peripheral edge (110), and wherein: The transition edge (120) comprises an arc segment (130) and an oblique line segment (140) connecting the arc segment (130), one of the arc segment (130) and the oblique line segment (140) being connected to the bottom edge (100), and the other of the arc segment (130) and the oblique line segment (140) being connected to the circumferential edge (110); The arc segment (130) has a first rake face (150), the cutting structure further comprises a tool groove (160), the tool groove (160) is connected to the peripheral edge (110), and a sub-groove (170) is provided between the first rake face (150) and the tool groove (160).

2. A cutting structure according to claim 1, characterized in that: The oblique line segment (140) is connected to the peripheral blade (110), and the angle between the oblique line segment (140) and the peripheral blade (110) is 11°; or, the oblique line segment (140) is connected to the bottom blade (100), and the angle between the oblique line segment (140) and the bottom blade (100) is 11°.

3. A cutting structure according to claim 1, characterized in that: On two adjacent cutting edges, the oblique line segment (140) of one cutting edge is connected to the bottom edge (100), and the oblique line segment (140) of the other cutting edge is connected to the peripheral edge (110).

4. A cutting structure according to claim 1, characterized in that: The front angle of the sub-groove (170) is 10 to 14 degrees.

5. The cutting structure according to claim 1, characterized in that: A rear width of the bottom blade (100) is 0.1D, where D is a tool radius; a rear angle of the bottom blade (100) is 6 to 12°; a second rear angle of the bottom blade (100) is 18 to 26°; and a front angle of the bottom blade (100) is 0 to 6°.

6. The cutting structure according to claim 1, characterized in that: A rear width of the peripheral blade (110) is 0.17D, a rear angle of the peripheral blade (110) is 8 to 12 degrees, two rear angles of the peripheral blade (110) are arc rear angles, and a front angle of the peripheral blade (110) is 3 to 6 degrees.

7. The cutting structure according to claim 1, characterized in that: The cutting structure is a spiral cutter, and the helix angle of the cutting structure is 38°.

8. The cutting structure according to claim 1, characterized in that: The number of the cutting edges is four, and the four cutting edges are arranged in a 7° unequal pitch structure.

9. A round nose knife, characterized in that: A cutting structure comprising any one of claims 1 to 8.

Images