WO2021046864A1

WO2021046864A1 - Cutting tool and tool bit structure thereof

Info

Publication number: WO2021046864A1
Application number: PCT/CN2019/106169
Authority: WO
Inventors: 颜炳姜; 李伟秋; 张国立
Original assignee: 汇专科技集团股份有限公司
Priority date: 2019-09-12
Filing date: 2019-09-17
Publication date: 2021-03-18

Abstract

Disclosed is a tool bit structure, comprising a cutting edge part (10), wherein the cutting edge part (10) comprises a cutting main body (11), and an outer surface of the cutting main body (11) comprises a front end face (11a) and an outer peripheral face (11b) connected to the front end face, the outer peripheral face (11b) being a cylindrical face. The outer surface of the cutting main body (11) is provided with a first cutting edge (12) and at least two second cutting edges (13) respectively arranged on two sides of the first cutting edge, wherein front end faces of the first cutting edge (12) and the second cutting edges (13) form arc faces protruding forwards; the first cutting edge (12) extends from one side of the outer peripheral face (11b) of the cutting main body to a center area of the front end face of the first cutting edge and then extends to the other side of the outer peripheral face (11b) of the cutting main body, and a first chip discharge groove (14) is provided between the first cutting edge (12) and the second cutting edge (13) adjacent thereto. The structure can improve the machining roughness of a 3D complex small curved surface contour, can facilitate increasing a step pitch of a cutting tool and improving the machining efficiency, and can reduce tool wear so as to prolong the service life of the tool. Further disclosed is a cutting tool comprising the tool bit structure.

Description

Cutting tool and its head structure

Technical field

The utility model relates to the technical field of precision machining, in particular to a cutting tool and its bit structure.

Background technique

In the prior art, the workpiece to be machined has many arc surfaces that need to be processed. In the process of using traditional spherical milling cutters to process arc surfaces, the main cutting edge provided through the center point of the top of the milling cutter is concentrated and wears quickly. It affects the service life of the tool and leads to unstable processing, resulting in differences in the surface roughness and profile of the same batch of workpieces, and the quality is difficult to guarantee. In order to solve this problem, some current technical solutions are provided with secondary cutting edges on both sides of the main cutting edge to assist cutting and reduce the cutting amount of the first cutting edge. However, this solution also has shortcomings: First, it is subject to spherical milling cutter processing. The influence of roughness and profile, in order to ensure the machining accuracy, the setting of the step distance is bound to be limited, which will affect the machining efficiency; second, affected by the curvature of the top of the spherical milling cutter, when machining small curved contours, the secondary cutting edge is The cutting amount shared by the main cutting edge is less, and the main cutting edge still needs to bear a larger part of the cutting amount, resulting in heavier wear of the main cutting edge, and poor profile and roughness of the processed workpiece; third, the top of the milling cutter If the cutting edges are too dense, a large amount of cutting chips will be generated during processing, which will make it difficult to remove the cutting chips in time, which will cause heat concentration in the processing, which will affect the life, processing accuracy and processing stability of the milling cutter.

Utility model content

The purpose of the utility model is to provide a cutting tool, which can improve the machining accuracy of small curved surface contours, is beneficial to increase the step distance of the cutting tool, thereby improving the processing efficiency, and can reduce the tool wear to prolong the service life of the tool.

In order to achieve the above objective, one aspect of the present invention provides a cutter head structure, which includes a cutting edge portion, the cutting edge portion includes a cutting main body, the outer surface of the cutting main body includes a front end surface and connected to the front end surface The outer peripheral surface of the cutting body is a cylindrical surface, the outer surface of the cutting body is provided with a first cutting edge and at least two second cutting edges, the front end surface of the first cutting edge and the first cutting edge The front end faces of the two cutting edges form a curved surface convex forward;

The first cutting edge extends from one side of the outer peripheral surface of the cutting main body to the central area of the front end surface of the cutting main body, and then extends to the other side of the outer peripheral surface of the cutting main body. Two cutting edges are respectively arranged on both sides of the first cutting edge, and a first chip flute is defined between the first cutting edge and the adjacent second cutting edge.

As a preferred solution, the arc surface formed by the front end surface of the first cutting edge and the front end surface of the second cutting edge is a circular arc surface with a radius R of 0.5 mm to 400 mm. The diameter D is 0.5mm-100mm.

As a preferred solution, the radius R of the arc surface formed by the front end surface of the first cutting edge and the front end surface of the second cutting edge is 1mm-50mm; the diameter D of the outer peripheral surface of the cutting body is 2mm-10mm .

As a preferred solution, the width of the first chip flute on the outer peripheral surface of the cutting body is greater than its width on the front end surface of the cutting body.

As a preferred solution, the portion of the first cutting edge located at the connection between the front end surface and the outer peripheral surface of the cutting body is provided with a chamfered edge portion, and the chamfered edge portion is in an arc shape that protrudes outward.

As a preferred solution, the chamfered blade portion is arc-shaped, and the radius r of the chamfered blade portion is 0.02 mm to 10 mm.

As a preferred solution, the radius r of the chamfered edge portion is 0.1 mm to 5 mm.

As a preferred solution, the front end surface of the cutting body is a forwardly convex arc surface, and the height of the first cutting edge and the second cutting edge are the same.

As a preferred solution, the first cutting edge passes through the apex of the front end surface of the cutting body, and the cutting body is symmetrically distributed with respect to the first cutting edge.

As a preferred solution, each of the second cutting edges is symmetrically distributed with respect to the first cutting edge.

As a preferred solution, the second cutting edge includes a first cutting segment and a second cutting segment respectively connecting two ends of the first cutting segment, the first cutting segment is located on the front end surface of the cutting body, and The second cutting segment extends from the end of the first cutting segment to the rear end of the outer peripheral surface of the cutting body;

Each of the second cutting segments is helical, and the two second cutting segments located at both ends of the first cutting segment have opposite directions of rotation, and are located on both sides of the first cutting edge. The direction of rotation of the second cutting segment is also reversed.

As a preferred solution, the first cutting segment is a straight edge, and the helix angle of the second cutting segment is 0-60°.

As a preferred solution, the helix angle of the second cutting segment is 5°-30°.

As a preferred solution, the second cutting edge is provided on both sides of the first cutting edge.

As a preferred solution, the edge width W1 of the first cutting edge and the edge width W2 of the second cutting edge are both 0.005 mm to 0.2 mm, and the groove depth of the first chip flute is 0.02 mm to 1 mm.

As a preferred solution, the edge width W1 of the first cutting edge and the edge width W2 of the second cutting edge are both 0.01 mm to 0.1 mm, and the groove depth of the first chip flute is 0.1 mm to 0.5 mm.

As a preferred solution, the cutting body, the first cutting edge and the second cutting edge are integrally formed.

As a preferred solution, the outer surface of the cutting body is further provided with cutting edge groups located outside the two outermost second cutting edges respectively;

The cutting edge group includes a plurality of third cutting edges, and a second cutting edge is defined between two adjacent third cutting edges, and between the third cutting edge and the second cutting edge adjacent thereto. Chip flutes.

As a preferred solution, each of the third cutting edges is symmetrically distributed with respect to the first cutting edge.

As a preferred solution, each of the third cutting edges has a spiral shape.

As a preferred solution, the cutting edge group has a symmetrical structure.

As a preferred solution, the rotation direction of each of the third cutting edges located on one side of the symmetrical centerline of the cutting edge group and each of the third cutting edges located on the other side of the symmetrical centerline of the cutting edge group in contrast.

As a preferred solution, the cutting edge group further includes at least two fourth cutting edges, each of the fourth cutting edges is respectively arranged on both sides of the symmetrical centerline of the cutting edge group, and is arranged close to the symmetrical centerline; A third chip flute is defined between the adjacent fourth cutting edges and between the fourth cutting edge and the third cutting edge adjacent thereto.

As a preferred solution, the portion of the fourth cutting edge located on the front end surface of the cutting body is a straight edge; the portion of the fourth cutting edge located on the outer peripheral surface of the cutting body is helical, and its rotation direction is The rotation directions of the third cutting edges on the same side of the symmetric center line of the cutting edge group are the same.

As a preferred solution, the helix angle of the third cutting edge is 0-60°, and the helix angle of each third cutting edge on the outer peripheral surface of the cutting body gradually increases from the middle to both sides.

As a preferred solution, the helix angle of the portion of the fourth cutting edge located on the outer peripheral surface of the cutting body is 0-60°, and is smaller than the helix angle of each of the third cutting edges.

As a preferred solution, one end of the third cutting edge is connected to the second cutting edge, and the other end of the third cutting edge is provided on the outer peripheral surface of the cutting body.

As a preferred solution, the material of the cutting edge portion is any one of polycrystalline diamond, single crystal diamond, chemical vapor deposition diamond, polycrystalline cubic boron nitride, ceramic, and cemented carbide.

In order to achieve the same purpose, another aspect of the present invention also provides a cutting tool, which includes a tool shank and the tool head structure in any of the above technical solutions, and the rear end surface of the cutting body is connected to the cutting tool. The front end of the tool shank.

Compared with the prior art, the beneficial effects of the present invention are:

The cutting tool of the utility model is provided with a first cutting edge and a plurality of second cutting edges respectively arranged on both sides of the first cutting edge on the outer surface of the cutting body. The outer surface of the cutting body includes a front end surface and a The outer peripheral surface connected by the front end surface is a cylindrical surface. The front end surface of the first cutting edge and the front end surface of the second cutting edge form a forward convex arc surface to facilitate the processing of small curved surfaces. The first cutting edge It extends from one side of the outer peripheral surface of the cutting body to the central area of the front end surface of the cutting body and then to the other side; in this way, in the process of processing small curved surfaces, the second cutting edge is used for cutting to cut most of the margin, Reduce the cutting amount of the first cutting edge located in the central area, so that the remaining less cutting margin is cut through the first cutting edge, which has the nature of roughing and finishing, thereby reducing the wear of the first cutting edge , And can effectively improve the machining accuracy, ensure the roughness of the workpiece after machining, extend the life of the first cutting edge, thereby prolonging the life of the tool; at the same time, due to the improvement of the machining accuracy of the tool, it is beneficial to meet the requirements of machining accuracy , Increase the step distance of the cutting tool, which can greatly improve the processing efficiency; in addition, the first chip flute defined between the second cutting edge and the first cutting edge can facilitate chip evacuation and avoid cutting chips in the cutting body The top area is backlogged to adversely affect the forming accuracy and tool life.

Description of the drawings

Fig. 1 is a schematic diagram of a three-dimensional structure of a cutter head structure provided by the first embodiment of the present invention;

Figure 2 is a top view of Figure 1;

Figure 3 is a front view of Figure 2;

Figure 4 is a left side view of Figure 2;

FIG. 5 is a schematic diagram of a three-dimensional structure of a cutter head structure provided by the second embodiment of the present invention;

Fig. 6 is a schematic diagram of a three-dimensional structure of a cutting tool provided by an embodiment of the present invention.

Among them, 100, cutter head structure; 10, cutting edge portion; 11, cutting main body; 11a, the front end surface of the cutting main body; 11b, the outer peripheral surface of the cutting main body; 12, the first cutting edge; 121, the chamfering edge portion; 13 , The second cutting edge; 131, the first cutting segment; 132, the second cutting segment; 14, the first chip flute; 15, the cutting edge group; 151, the third cutting edge; 152, the fourth cutting edge; 16. The second chip flute; 17, the third chip flute; 18, the fourth chip flute; 200, the tool shank.

detailed description

The specific implementation of the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

In the description of the present utility model, it should be understood that the terms "front" and "rear" refer to the end of the cutting tool that is close to the workpiece during the cutting process as "front", and the end away from the workpiece as "front" Rear". In addition, it should be noted that the term "central area of the front end surface of the cutting body" in the present invention refers to the position of the area that includes the center point on the front end surface of the cutting main body and is close to the center point of the front end surface of the cutting main body ", "The apex of the front face of the cutting body" refers to the position of the cutting tool at the farthest distance from the tool shank on the front face of the cutting body during the cutting process. "The top area of the front face of the cutting body" refers to The outer surface of the cutting body includes the apex of the front end surface of the cutting body and the location of the region close to the apex of the front end surface of the cutting body. In addition, the present invention adopts the terms "first", "second", and "third" To describe various information, it is only used to distinguish the same type of information from each other, and cannot be understood as indicating or implying relative importance.

In one aspect of the present invention, a cutter head structure is provided, and the specific implementation is as follows:

Example one

1 to 4, as a preferred embodiment of a cutter head structure 100 provided by the present invention, it includes a cutting edge portion 10, wherein the cutting edge portion 10 includes a cutting body 11, the cutting The outer surface of the main body 11 includes a front end surface 11a and an outer peripheral surface 11b connected to the front end surface 11a. The outer peripheral surface 11b of the cutting main body 11 is a cylindrical surface. The outer surface of the cutting main body 11 is provided with a first cutting edge 12 and at least Two second cutting edges 13; the first cutting edge 12 extends from one side of the outer peripheral surface 11b of the cutting body 11 to the top area of the front end surface of the cutting body 11, and then extends to the cutting body On the other side of the outer peripheral surface 11b of 11, each of the second cutting edges 13 is provided on both sides of the first cutting edge 12, the front end surface of the first cutting edge 12 and the front end of the second cutting edge 13 The surface forms a forward convex arc surface to facilitate the processing of a small curved surface. A first chip flute 14 is defined between the first cutting edge 12 and the adjacent second cutting edge 13.

Based on the above-mentioned technical feature of the cutter head structure, the outer surface of the cutting body 11 is provided with a first cutting edge 12 and a number of second cutting edges 13, as can be seen from the top view shown in FIG. The central area of the cutting body 11 shows a specific embodiment including two second cutting edges 13, the two second cutting edges 13 are respectively provided on both sides of the first cutting edge 12 In this way, when machining small curved contours, for example, the second cutting edge 13 performs cutting operations to cut most of the margin, reducing the cutting amount of the first cutting edge 12 located in the central area, and making the remaining less The cutting allowance is cut by the first cutting edge 12, which has the nature of roughing and finishing, which can reduce the wear of the first cutting edge 12, and can effectively improve the machining accuracy and ensure that the workpiece is processed The roughness of the first cutting edge 12 prolongs the service life of the tool, thereby prolonging the service life of the tool; at the same time, due to the improvement of tool machining accuracy, it is beneficial to increase the step distance of the cutting tool while meeting the machining accuracy requirements. , Compared with the spherical milling cutter, the machining efficiency can be greatly improved.

Moreover, in this embodiment, the first chip flute 14 defined between the second cutting edge 13 and the first cutting edge 12 facilitates the timely discharge of the cutting chips in the top area of the tool, and avoids the cutting chips in the place. The top area of the cutting body 11 is backlogged to adversely affect the forming accuracy and tool life. Further, the width of the first chip evacuation groove 14 on the outer peripheral surface 11b of the cutting body 11 is greater than its width on the front end surface of the cutting body 11, which can further optimize the chip evacuation ability and avoid processing heat concentration. , Improve processing accuracy and processing stability.

Preferably, in this embodiment, referring to FIG. 3, the arc surface formed by the front end surface of the first cutting edge 12 and the front end surface of the second cutting edge 13 is a circular arc surface. The radius of R is R, R is 0.5mm ~ 400mm, the diameter of the outer peripheral surface 11b of the cutting body 11 is D, and D is 0.5mm ~ 100mm. Based on the cutter head structure in this range, the machining of small curved contours can be guaranteed Accuracy, the specific dimensions of R and D can be determined according to the curvature of the machined surface. Further, R is 1 mm to 50 mm, and the diameter D is 2 mm to 10 mm.

As a preferred embodiment, as shown in FIGS. 1 and 3, the first cutting edge 12 is provided with a chamfered edge portion 121 at the connection between the front end surface 11a and the outer peripheral surface 11b of the cutting body 11. The chamfered edge portion 121 has an arc shape that protrudes outwards, thereby forming a double arc structure, which is convenient for processing curved surfaces with various structural contours, thereby improving the applicability of the tool.

Preferably, in an embodiment, the chamfered edge portion 121 is in the shape of an arc, the radius of the chamfered edge portion 121 is r, and r is 0.02 mm to 10 mm, so as to facilitate the processing of small curved surface contours. Further, the radius r of the chamfered blade portion 121 is 0.1 mm to 5 mm.

Further, in an embodiment, the front end surface 11a of the cutting body 11 is a curved surface convex forward, and the height of the first cutting edge 12 and each of the second cutting edges 13 are the same, so that The front end surface of the first cutting edge 12 and the front end surface of the second cutting edge 13 form a forward convex arc surface. It can be understood that, as an alternative, the front end surface 11a of the cutting body 11 is a flat surface, and the first cutting edge 12 is higher than the height of each second cutting edge 13, so that the first cutting edge 12 is The front end surface and the front end surface of the second cutting edge 13 form a forward convex arc surface, and the front end surface of the first cutting edge 12 protrudes.

Preferably, for example, the first cutting edge 12 passes through the apex of the front end surface 11 a of the cutting body 11, and the cutting body 11 is symmetrically distributed with respect to the first cutting edge 12. When machining the contour of the curved surface, the middle area of the first cutting edge 12 is mainly used to cut the workpiece with a small margin, so as to improve the machining accuracy of the contour of the workpiece.

Specifically, each of the second cutting edges 13 is symmetrically distributed with respect to the first cutting edge 12, so that each of the second cutting edges 13 can evenly share the cutting amount of the first cutting edge 12, which is more conducive to Reduce the cutting amount of the first cutting edge 12, thereby reducing the wear of the first cutting edge 12, and helping to ensure the stability of the tool during cutting operations, effectively improving the machining accuracy, ensuring the roughness of the workpiece after machining, and extending the first cutting edge The service life of 12, thereby further extending the service life of the tool.

Continuing to refer to FIGS. 1 to 4, more specifically, the second cutting edge 13 includes a first cutting section 131 and a second cutting section 132 respectively connected to both ends of the first cutting section 131. The first cutting section 131 is located on the front end surface 11 a of the cutting body 11, and the second cutting section 132 extends from one end of the first cutting section 131 to the rear end of the outer peripheral surface 11 b of the cutting body 11. In this embodiment, the first cutting section 131 and the first cutting edge 12 are set to be straight edges, and the second cutting section 132 is set in a spiral shape and located in the first cutting section 131. The rotation directions of the two second cutting segments 132 at both ends are opposite, and the rotation directions of the second cutting segments 132 corresponding to both sides of the first cutting edge 12 are also opposite, so that the first The width of the chip flute 14 on the outer circumferential surface 11b of the cutting body 11 is greater than its width on the front end surface 11a of the cutting body 11, so that most of the margin of the workpiece can be cut to ensure the smoothness of the processed curved surface. Contour degree. Of course, as an alternative, in other implementations, the first cutting segment 131 may also be arranged in a spiral shape.

Preferably, the helix angle of the second cutting segment 132 in the above embodiment is 0-60°. Based on the helix angle range, the strength, sharpness, and cutting force of the second cutting edge 13 are all ideal, and Able to ensure chip removal speed. Further, the helix angle of the second cutting segment 132 is 5°-30°, preferably 5°, 10°, 15°, 20° or 30°.

Referring to Figure 2, the distance between the two sides of the cutting edge is defined as the edge width, the edge width of the first cutting edge 12 is W1, and the edge width of the second cutting edge 13 is W2, where W1 W2 and W2 are both 0.005mm～0.2mm; the groove depth of the first chip flute 14 is set to 0.02mm～1mm, so as to ensure that the chips can be smoothly discharged from the first chip flute 14 during the cutting process. Further, W1 and W2 are both 0.01 mm to 0.1 mm, and the groove depth of the first chip flute is 0.1 mm to 0.5 mm.

On the basis of the above structure, in order to further reduce the cutting amount of the first cutting edge 12, in this embodiment, referring to FIGS. 1 to 4, the outer surface of the cutting body 11 is also provided with the outermost As shown in FIG. 2, the cutting edge groups 15 outside the two second cutting edges 13 are respectively provided with the cutting edge groups 15 on the upper and lower sides of the first cutting edge 12. Wherein, the cutting edge group 15 includes a plurality of third cutting edges 151, between two adjacent third cutting edges 151, and the third cutting edge 151 and the second cutting edge 13 adjacent thereto. A second chip flute 16 is defined between them. In the cutting operation, by using several third cutting edges 151 distributed on both sides of the first cutting edge 12 as auxiliary cutting edges, in conjunction with each of the second cutting edges 13, the cutting amount can be evenly distributed to reduce single-tooth Processing depth, thereby further reducing the cutting amount of the first cutting edge 12, reducing its wear, and achieving the purpose of effectively improving the processing accuracy and ensuring the surface roughness of the workpiece. Through the arrangement of the third cutting edge 151, the production of machining marks can be avoided, and the step distance of the tool can be increased under the premise of ensuring the machining accuracy, thereby further improving the machining efficiency. Compared with the traditional spherical milling cutter, the cutting tool of this embodiment It can reach twice the step distance of the spherical milling cutter, the processing efficiency has doubled, and the roughness can be increased to 200-300nm, which is impossible for the spherical milling cutter.

As a preferred embodiment, in this embodiment, each of the third cutting edges 151 is symmetrically distributed with respect to the first cutting edge 12, which can ensure the stability of the tool during the cutting and rotation process, and it is also conducive to uniform distribution. Cutting amount to ensure machining accuracy.

Exemplarily, in this embodiment, each of the third cutting edges 151 has a spiral shape, and the spiral arrangement can ensure a sufficiently large cutting force to improve processing efficiency. Of course, as an alternative, each of the third cutting edges 151 may also be a straight edge.

Preferably, the cutting edge group 15 has a symmetrical structure, which is beneficial to evenly distributing the cutting amount and ensuring machining accuracy. Further, each of the third cutting edges 151 located on one side of the symmetrical centerline of the cutting edge group 15 and each of the third cutting edges 151 located on the other side of the symmetrical centerline of the cutting edge group 15 The direction of rotation is opposite, which can further improve the machining accuracy and improve the wear resistance of the tool to extend the service life of the tool.

Further preferably, in this embodiment, the cutting edge group 15 further includes at least two fourth cutting edges 152, and each of the fourth cutting edges 152 is provided on two sides of the symmetrical centerline of the cutting edge group 15 respectively. It is arranged close to its symmetrical centerline, which can increase the cutting amount of the cutting edge group 15, so as to reduce the cutting amount of the first cutting edge 12, and at the same time, it can further improve the uniformity of the cutting edge in the central area of the cutting body 11; A third chip flute 17 is defined between adjacent to the fourth cutting edge 152 and between the fourth cutting edge 152 and the third cutting edge 151 adjacent thereto. Since the fourth cutting edge 152 is located close to the symmetrical centerline of the cutting edge group 15, the overall structure of the fourth cutting edge 152 can be set to be in the same direction as the third cutting edge 151 on the same side. It is also possible to set the portion of the fourth cutting edge 152 located on the front end surface 11a of the cutting body 11 as a straight edge, and set the portion located on the outer peripheral surface of the cutting body 11 into a spiral shape, and The direction of rotation of this part is the same as the direction of rotation of the third cutting edge 151 located on the same side of the center line of symmetry of the cutting edge group 15. In this embodiment, the portion of the fourth cutting edge 152 located on the front end surface 11a of the cutting body 11 is a straight edge, and the portion located on the outer peripheral surface of the cutting body 11 is spiral, and the direction of rotation is the same as The third cutting edge 151 on the side has the same direction of rotation, so as the auxiliary cutting edge located on the front end surface 11a of the cutting body 11, it passes through the spiral edge of the third cutting edge 151 and the straight edge portion of the fourth cutting edge 152 In combination, the cutting force can be further improved, the cutting amount can be evenly distributed, the machining accuracy can be improved, and the wear resistance of the tool can be further improved.

For the same purpose, in this embodiment, the helix angle of the third cutting edge 151 is 0-60°, and the helix angle of each third cutting edge 151 on the outer peripheral surface of the cutting body 11 is from the middle When the two sides gradually increase, the helix angle of the third cutting edge 151 is further from 5° to 30°; further, the helix angle of the portion of the fourth cutting edge 152 located on the outer peripheral surface of the cutting body 11 is 0-60°, and smaller than the helix angle of each of the third cutting edges 151, which can improve the wear resistance of the tool and ensure the machining accuracy; the fourth cutting edge 152 is located at the portion of the outer peripheral surface of the cutting body 11 The helix angle is further from 5° to 30°.

In order to ensure the strength of the tool, one end of the third cutting edge 151 is connected to the second cutting edge 13, and the other end of the third cutting edge 151 is disposed on the outer peripheral surface 11 b of the cutting body 11.

Illustratively, in this embodiment, the cutting edge group 15 includes six third cutting edges 151 and two fourth cutting edges 152 located on one side of the first cutting edge 12. It can be understood that the number of the third cutting edge 151 and the fourth cutting edge 152 can be appropriately increased according to actual needs to improve machining accuracy.

Further preferably, the cutting body 11, the first cutting edge 12, the second cutting edge 13, the third cutting edge 151, and the fourth cutting edge 152 are integrally formed, which not only facilitates the formation of each cutting edge on the cutting edge The outer surface of the main body 11 can ensure the overall wear resistance and overall strength of the cutting edge portion 10.

In this embodiment, the material of the cutting edge portion 10 is preferably polycrystalline diamond. Compared with the traditional coated milling cutter, the tool with the monolithic polycrystalline diamond structure has greatly improved wear resistance and effectively improves the machining accuracy. And processing efficiency, and can extend the life of the tool.

Similarly, the material of the cutting edge portion 10 can also be set to single crystal diamond, chemical vapor deposition diamond, polycrystalline cubic boron nitride, ceramics and cemented carbide or others, which can also ensure the wear resistance of the tool.

Example two

This embodiment also proposes a cutter head structure, which is shown in FIG. 5 for details. The difference from Embodiment 1 is only that the cutting body 11 in this embodiment is provided with four second cutting edges 13, namely Two second cutting edges 13 are respectively provided on both sides of the first cutting edge 12, and a fourth chip flute 18 is defined between two adjacent second cutting edges 13. It can be understood that three, four, or more than four second cutting edges 13 may also be provided on both sides of the first cutting edge 12, and the second cutting edges 13 are arranged at intervals.

To achieve the same purpose, another aspect of the present invention also provides a cutting tool. Please refer to FIG. 6, which includes a tool shank 200 and the tool head structure 100 in the above-mentioned embodiment. The rear end surface is connected to the front end of the tool handle 200. Since the cutter head structure 100 provided by the embodiment of the present invention can achieve the above technical effects, the cutting tool equipped with the cutter head structure 100 should also have corresponding technical effects, which will not be repeated here.

In addition, it should be noted that the cutting tool in the embodiment of the present invention is mainly used for processing small curved surface contours. Since the front end surface 11a of the cutting body 11 is a curved surface, and its outer peripheral surface 11b is a cylindrical surface, it is beneficial to the processing of small curved surface contours. . The second cutting edge 13, the third cutting edge 151, and the fourth cutting edge 152 can remove most of the cutting amount in the workpiece during the rotation and feeding process, and the remaining small part of the cutting amount is cut by the first cutting edge 12. The nature of roughing and finishing, and the waste generated during the milling process is discharged through the first chip flute 14, the second chip flute 16 and the third chip flute 17, respectively.

In summary, the present invention provides a cutting tool and its bit structure. The outer surface of the cutting main body 11 is provided with a first cutting edge 12 and a plurality of cutting edges respectively arranged on both sides of the first cutting edge 12 The outer peripheral surface of the second cutting edge 13 is a cylindrical surface, and the front end surface of the first cutting edge 12 and the front end surface of the second cutting edge 13 form a forward convex arc surface to facilitate the processing of small curved surface contours; The cutting edge 13 cooperates with the main cutting, which can reduce the wear of the first cutting edge 12, effectively improve the roughness of the complex 3D small curved surface, and extend the service life of the tool; at the same time, due to the improvement of the tool processing accuracy, it is beneficial to increase the step of the cutting tool. In addition, the width of the first chip flute 14 defined between the second cutting edge 13 and the first cutting edge 12 on the outer circumferential surface of the cutting body 11 is greater than that on the cutting body 11 The width of the front end surface can optimize the chip removal ability and avoid the accumulation of cutting chips on the top area of the cutting body 11 to adversely affect the forming accuracy and tool life.

The above are only the preferred embodiments of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principles of the present utility model, several improvements and replacements can be made. These improvements And replacement should also be regarded as the protection scope of this utility model.

Claims

A cutter head structure, characterized in that it includes a cutting edge portion, the cutting edge portion includes a cutting main body, the outer surface of the cutting main body includes a front end surface and an outer peripheral surface connected to the front end surface, and the outer peripheral surface of the cutting main body It is a cylindrical surface, the outer surface of the cutting body is provided with a first cutting edge and at least two second cutting edges, and the front end surface of the first cutting edge and the front end surface of the second cutting edge form a forward protrusion Arc of

The first cutting edge extends from one side of the outer peripheral surface of the cutting main body to the central area of the front end surface of the cutting main body, and then extends to the other side of the outer peripheral surface of the cutting main body. Two cutting edges are respectively arranged on both sides of the first cutting edge, and a first chip flute is defined between the first cutting edge and the adjacent second cutting edge.
The cutter head structure according to claim 1, wherein the arc surface formed by the front end surface of the first cutting edge and the front end surface of the second cutting edge is a circular arc surface with a radius R of 0.5 mm ~400mm, the diameter D of the outer peripheral surface of the cutting body is 0.5mm-100mm.
The cutter head structure according to claim 2, wherein the radius R of the arc surface formed by the front end surface of the first cutting edge and the front end surface of the second cutting edge is 1mm-50mm; the cutting The diameter D of the outer peripheral surface of the main body is 2 mm to 10 mm.
The cutter head structure according to claim 1, wherein the width of the first chip flute on the outer peripheral surface of the cutting body is greater than its width on the front end surface of the cutting body.
The cutter head structure according to claim 1, wherein the part of the first cutting edge at the junction of the front end surface and the outer peripheral surface of the cutting body is provided with a chamfered edge portion, and the chamfered edge portion It is an arc that bulges outward.
The cutter head structure according to claim 5, wherein the chamfered edge portion is arc-shaped, and the radius r of the chamfered edge portion is 0.02 mm to 10 mm.
The cutter head structure according to claim 6, wherein the radius r of the chamfered edge portion is 0.1 mm to 5 mm.
The cutter head structure according to claim 1, wherein the front end surface of the cutting body is a forwardly convex arc surface, and the height of the first cutting edge and each of the second cutting edges are the same.
The cutter head structure according to claim 8, wherein the first cutting edge passes through the apex of the front end surface of the cutting body, and the cutting body is symmetrically distributed with respect to the first cutting edge.
The tool head structure according to claim 9, wherein each of the second cutting edges is symmetrically distributed with respect to the first cutting edge.
The cutter head structure according to claim 9, wherein the second cutting edge comprises a first cutting section and a second cutting section respectively connected to both ends of the first cutting section, and the first cutting section is located at On the front end surface of the cutting body, the second cutting section extends from the end of the first cutting section to the rear end of the outer peripheral surface of the cutting body;

Each of the second cutting segments is helical, and the two second cutting segments located at both ends of the first cutting segment have opposite directions of rotation, and are located on both sides of the first cutting edge. The direction of rotation of the second cutting segment is also reversed.
The cutter head structure according to claim 11, wherein the first cutting section is a straight edge, and the helix angle of the second cutting section is 0-60°.
The cutter head structure according to claim 12, wherein the helix angle of the second cutting segment is 5°-30°.
The cutter head structure according to claim 9, wherein the second cutting edge is respectively provided on both sides of the first cutting edge.
The cutter head structure according to claim 1, wherein the edge width W1 of the first cutting edge and the edge width W2 of the second cutting edge are both 0.005mm～0.2mm, and the first chip removal The groove depth of the groove is 0.02 mm to 1 mm.
The cutter head structure according to claim 15, wherein the edge width W1 of the first cutting edge and the edge width W2 of the second cutting edge are both 0.01mm～0.1mm, and the first chip removal The groove depth of the groove is 0.1 mm to 0.5 mm.
The cutter head structure according to claim 1, wherein the cutting body, the first cutting edge, and the second cutting edge are integrally formed.
The cutter head structure according to any one of claims 1 to 17, wherein the outer surface of the cutting body is further provided with cutting edge groups located outside the two outermost second cutting edges. ；

The cutting edge group includes a plurality of third cutting edges, and a second cutting edge is defined between two adjacent third cutting edges, and between the third cutting edge and the second cutting edge adjacent thereto. Chip flute.
The tool head structure according to claim 18, wherein each of the third cutting edges is symmetrically distributed with respect to the first cutting edge.
The cutter head structure according to claim 18, wherein each of the third cutting edges has a spiral shape.
The cutter head structure according to claim 20, wherein the cutting edge group is an axisymmetric structure.
The cutter head structure according to claim 21, wherein each of the third cutting edges located on one side of the symmetrical centerline of the cutting edge group is on the other side of the symmetrical centerline of the cutting edge group The direction of rotation of each of the third cutting edges is opposite.
The cutter head structure according to claim 21, wherein the cutting edge group further comprises at least two fourth cutting edges, and each of the fourth cutting edges is respectively disposed on the symmetrical centerline of the cutting edge group. Both sides are arranged close to the center line of symmetry; a third chip flute is defined between the adjacent fourth cutting edges, and between the fourth cutting edge and the adjacent third cutting edge .
The cutter head structure according to claim 23, wherein the portion of the fourth cutting edge located on the front end surface of the cutting body is a straight edge; the fourth cutting edge is located on the outer peripheral surface of the cutting body. The part is spiral, and its rotation direction is the same as the rotation direction of the third cutting edge located on the same side of the symmetric center line of the cutting edge group.
The tool bit structure according to claim 22, wherein the helix angle of the third cutting edge is 0-60°, and the helix angle of each third cutting edge on the outer peripheral surface of the cutting body Gradually increase from the middle to the sides.
The cutter head structure according to claim 24, wherein the helix angle of the portion of the fourth cutting edge located on the outer peripheral surface of the cutting body is 0-60°, and is smaller than that of each of the third cutting edges Helix angle.
The cutter head structure according to claim 18, wherein one end of the third cutting edge is connected to the second cutting edge, and the other end of the third cutting edge is disposed on the outer peripheral surface of the cutting body .
The tool bit structure according to claim 1, wherein the material of the cutting edge portion is polycrystalline diamond, single crystal diamond, chemical vapor deposition diamond, polycrystalline cubic boron nitride, ceramics and cemented carbide. Any kind.
A cutting tool, characterized by comprising a tool shank and the tool head structure according to any one of claims 1 to 28, and the rear end surface of the cutting body is connected to the front end of the tool shank.