CN210648706U - Cutting tool and tool bit structure thereof - Google Patents
Cutting tool and tool bit structure thereof Download PDFInfo
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- CN210648706U CN210648706U CN201921395395.4U CN201921395395U CN210648706U CN 210648706 U CN210648706 U CN 210648706U CN 201921395395 U CN201921395395 U CN 201921395395U CN 210648706 U CN210648706 U CN 210648706U
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Abstract
The utility model relates to a precision finishing technical field discloses a cutting tool and tool bit structure thereof, and the tool bit structure includes cutting edge portion, and cutting edge portion includes cutting subject, cutting subject's surface is bellied cambered surface forward, cutting subject's surface is equipped with first cutting edge and two at least second cutting edges, first cutting edge is followed one side of cutting subject extends to its top region back, extends to again cutting subject's opposite side, each the second cutting edge is located respectively the both sides of first cutting edge, first cutting edge with rather than adjacent inject first chip groove between the second cutting edge, the width of first chip groove is followed cutting subject's top region to both ends grow gradually. The utility model has the advantages that: the machining precision is high, the machining stability is high, the chip removal performance is good, and the service life of the cutter can be greatly prolonged.
Description
Technical Field
The utility model relates to a precision finishing technical field especially relates to a cutting tool and tool bit structure thereof.
Background
At present, a main cutting edge is arranged at the center point of the top of a traditional spherical milling cutter, when a curved surface is milled, surface materials of workpieces are removed by means of extrusion or cutting at the top point of the main cutting edge, but due to stress concentration at the top point, the abrasion of the main cutting edge at the top point of a cutter is large, the service life of the cutter is limited, and when the workpieces are machined in batches, the machining is unstable, and the surface roughness and the profile tolerance of each workpiece are unstable; to this problem, can set up the secondary cutting edge in the both sides of main cutting edge to supplementary main cutting edge cutting extrusion, nevertheless because the cutting edge is regional intensive at the top of cutter, lead to the cutting bits to discharge not smoothly, not only can make processing heat concentrate, and also can cause very big influence to the machining precision and the processing stability of work piece.
SUMMERY OF THE UTILITY MODEL
The utility model aims at: the defects of the prior art are overcome, the cutting tool is provided, the service life of the tool can be prolonged due to the fact that the tool is abraded, the surface roughness of a machined workpiece is guaranteed, machining stability is improved, and chip removal performance is improved.
In order to achieve the above object, a first aspect of the present invention provides a cutter head structure including a cutting edge portion including a cutting main body, an outer surface of the cutting main body being a forward convex curved surface, the outer surface of the cutting main body being provided with a first cutting edge and at least two second cutting edges,
the first cutting edge extends from one side of the cutting body to the top area of the cutting body and then extends to the other side of the cutting body, the second cutting edges are respectively arranged at two sides of the first cutting edge, a first chip discharge groove is defined between the first cutting edge and the second cutting edge adjacent to the first cutting edge, and the width of the first chip discharge groove is gradually increased from the top area of the cutting body to two ends of the cutting body.
Preferably, the first cutting edge passes through an apex of the cutting body, and the cutting body is symmetrically distributed about the first cutting edge.
Preferably, each of the second cutting edges is symmetrically distributed with respect to the first cutting edge.
Preferably, the second cutting edge has an arc shape that is convex toward the first cutting edge.
Preferably, the second cutting edge includes a first cutting segment and a second cutting segment, the first cutting segment extends from one side of the cutting body to a top region thereof and then is connected with one end of the second cutting segment, and the second cutting segment extends from the top region of the cutting body to the other side of the cutting body;
the first cutting section and the second cutting section are both helical, and the rotation direction of the first cutting section is opposite to that of the second cutting section.
Preferably, the helix angle of the first cutting section and the helix angle of the second cutting section are both 0-80 °.
Preferably, the second cutting edge is disposed on each of both sides of the first cutting edge.
Preferably, the diameter of the cutting body is 0.2mm to 20mm, the cutting widths of the first cutting edge and the second cutting edge are 0.005mm to 0.2mm, and the groove depth of the first chip discharge groove is 0.05mm to 1 mm.
Preferably, the cutting body, the first cutting edge, and the second cutting edge are integrally formed.
Preferably, the outer surface of the cutting body is further provided with a plurality of third cutting edges, each third cutting edge is arranged on the outer side of each of the two outermost second cutting edges, and a second chip discharge groove is defined between each two adjacent third cutting edges and between each third cutting edge and the adjacent second cutting edge.
Preferably, each of the third cutting edges is symmetrically distributed with respect to the first cutting edge.
Preferably, each of the third cutting edges has a helical shape.
Preferably, each of the third cutting edges located on the same side of the first cutting edge is a cutting edge group, the cutting edge group is of a symmetrical structure, and the rotation directions of each of the third cutting edges located on one side of the symmetrical center line of the cutting edge group are opposite to those of each of the third cutting edges located on the other side of the symmetrical center line of the cutting edge group.
Preferably, the helix angle of the third cutting edge is 0 to 80 °, and the helix angle of each third cutting edge in the cutting edge group gradually decreases from both sides to the middle.
Preferably, 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 surface of the cutting body.
Preferably, the outer surface of the cutting body is a hemispherical surface.
Preferably, 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 hard alloy.
Preferably, the insert structure further comprises a connecting portion, and the rear end surface of the cutting body is connected to the front end of the connecting portion.
Preferably, the cutting edge portion and the connecting portion are made of the same material, and the cutting edge portion and the connecting portion are integrally formed.
In a second aspect of the present invention, there is provided a cutting tool comprising a tool shank and a head structure according to any one of the first aspect, wherein a rear end surface of the cutting body is connected to a front end of the tool shank.
The embodiment of the utility model provides a cutting tool compares with prior art, and its beneficial effect lies in:
the cutting tool provided by the embodiment of the utility model is provided with a first cutting edge and second cutting edges respectively arranged at two sides of the first cutting edge on the outer surface of a cutting main body, wherein the first cutting edge extends from one side of the cutting main body to the top area and then extends to the other side; in the milling process, the second cutting edge performs cutting action to remove most of allowance, and the remaining smaller machining allowance is extruded by the first cutting edge, so that the machining precision can be effectively improved, the abrasion of the first cutting edge is reduced, and the service life of the first cutting edge is prolonged; moreover, the width of the first chip removal groove defined between the second cutting edge and the first cutting edge is gradually increased from the top area of the cutting main body to two ends, so that the chip removal capacity can be optimized, and the chip is prevented from being accumulated in the top area of the cutting main body to cause adverse effects on the forming precision and the service life of the cutter.
Drawings
Fig. 1 is a schematic structural diagram of a tool bit structure according to an embodiment of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a left side view of FIG. 2;
fig. 4 is a schematic structural diagram of a tool bit structure according to a second embodiment of the present invention;
fig. 5 is a schematic structural diagram of a cutting tool according to an embodiment of the present invention.
In the figure, 100, the tool tip configuration; 1. a connecting portion; 2. a cutting edge part; 21. a cutting body; 22. a first cutting edge; 23. a second cutting edge; 231. a first cutting section; 232. a second cutting segment; 24. a first chip discharge groove; 25. a set of cutting edges; 251. a third cutting edge; 26. a second chip groove; 27. a third chip groove;
200. a tool shank.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the terms "front" and "rear" are used in the present invention to mean that the end of the cutting tool close to the workpiece to be machined is "front" and the end away from the workpiece to be machined is "rear" during use.
In addition, it should be noted that the term "vertex of the cutting body" in the present disclosure refers to a location on the outer surface of the cutting body that is farthest from the tool shank during use of the cutting tool, and the "top region of the cutting body" refers to a location on the outer surface of the cutting body that includes the vertex of the cutting body and that is closer to the vertex of the cutting body.
It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, and these terms are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.
The utility model discloses an aspect provides a tool bit structure, and detailed implementation mode is as follows:
example one
As shown in fig. 1 to 3, a cutter head structure 100 according to a preferred embodiment of the present invention includes a connecting portion 1 and a cutting edge portion 2 disposed at a front end of the connecting portion 1, wherein the cutting edge portion 2 includes a cutting body 21 fixed at the front end of the connecting portion 1, an outer surface of the cutting body 21 is an outwardly convex arc surface, the outer surface of the cutting body 21 is provided with a first cutting edge 22 and at least two second cutting edges 23,
the first cutting edge 22 extends from one side of the cutting body 21 to a top region thereof, and then extends to the other side of the cutting body 21, the second cutting edges 23 are respectively disposed at both sides of the first cutting edge 22, a first chip groove 24 is defined between the first cutting edge 22 and the second cutting edge 23 adjacent thereto, and the width of the first chip groove 24 gradually increases from the top region to both ends of the cutting body 21.
Based on the above technical solution, the tool tip structure 100 is provided with the first cutting edge 22 and the plurality of second cutting edges 23, and fig. 2 shows a top view of the tool tip structure 100, and as seen from the top view, the first cutting edge 22 passes through a central region of the cutting body 21 and includes two second cutting edges 23, and each second cutting edge 23 is respectively disposed on two sides of the first cutting edge 22, wherein, in the milling process, the second cutting edge 23 cuts most of the allowance of the workpiece, and the remaining small machining allowance is subjected to finish machining by the extrusion effect of the first cutting edge 22, so that the machining precision can be ensured, the surface roughness of the machined surface can be improved, the wear of the first cutting edge 22 can be avoided, and the service life of the first cutting edge 22 can be prolonged.
In addition, in the embodiment, the width of the first chip-removing groove 24 defined between the first cutting edge 22 and the second cutting edge 23 gradually increases from the top region of the cutting body 21 to both ends, so that the waste chips in the top region of the tool can be discharged in time, and the adverse effect of the waste chips accumulated on the top region of the cutting body 21 on the machining effect and the service life of the tool is avoided.
Preferably, in this embodiment, the first cutting edge 22 passes through an apex of the cutting body 21, and the cutting body 21 is symmetrically distributed about the first cutting edge 22; in the milling process, the workpiece is pressed with a small margin mainly by the middle area of the first cutting edge 22, so that the surface roughness and the profile of the machined workpiece can be improved.
Specifically, in the present embodiment, the second cutting edges 23 are symmetrically distributed with respect to the first cutting edge 22, so that the stability of the tool during rotation can be ensured, and the chatter phenomenon during the machining process can be avoided.
As an alternative to the above, the first cutting edge 22 may be offset from the apex of the cutting body 21, i.e., the first cutting edge 22 may be disposed offset from the center line of symmetry of the cutting body 21.
With continued reference to fig. 2, the second cutting edge 23 is curved and convex toward the first cutting edge 22 such that the width of the first chip flute 24 gradually increases from the middle to both ends.
Specifically, the second cutting edge 23 includes a first cutting segment 231 and a second cutting segment 232, the first cutting segment 231 extends from one side of the cutting body 21 to a top region thereof and then is connected to one end of the second cutting segment 232, and the second cutting segment 232 extends from the top region of the cutting body 21 to the other side of the cutting body 21;
the first cutting segment 231 and the second cutting segment 232 are both helical, and the direction of rotation of the first cutting segment 231 is opposite to the direction of rotation of the second cutting segment 232.
In this technical solution, the first cutting segment 231 and the second cutting segment 232 with opposite rotation directions are connected to form an arc shape protruding toward the first cutting edge 22, so that most of the allowance of the workpiece to be machined can be cut, and the profile of the machined curved surface can be ensured.
In this embodiment, the helix angle of the first cutting segment 231 and the second cutting segment 232 is 0-80 °, and based on the helix angle, the strength, sharpness and cutting force of the second cutting edge 23 are all ideal, and the chip removal speed can be ensured.
As shown in fig. 2, the diameter of the cutting body 21 is D, D is 0.2mm to 20mm, and the specific dimension is determined according to the size of the curved surface to be machined; defining the distance between two side surfaces of the cutting edge as the edge width, wherein the edge width of the first cutting edge 22 is L1, the edge width of the second cutting edge 23 is L2, and L1 and L2 are both 0.005 mm-0.2 mm; in addition, the depth of the first chip discharge groove 24 is set to be 0.05 mm-1 mm, so that smooth discharge of waste chips in the milling process is guaranteed.
Similarly, in order to further increase the cutting force and the machining precision and improve the chip removal capability, the outer surface of the cutting body 21 is further provided with a plurality of third cutting edges 251, each third cutting edge 251 is respectively arranged outside two outermost second cutting edges 23, and a second chip removal groove 26 is defined between each adjacent third cutting edge 251 and between each third cutting edge 251 and the second cutting edge 23 adjacent to the third cutting edge 251; during milling, the third cutting edge 251 and the second cutting edge 23 act simultaneously to cut most of the allowance of the machined workpiece, and then finish machining is performed in cooperation with the first cutting edge 22.
In this embodiment, since the third cutting edge 251 is provided in the cutting body 21, it is possible to avoid the occurrence of line marks in machining, ensure the finish machining depth, and perform the function of layered cutting.
Preferably, in this embodiment, each of the third cutting edges 251 is symmetrically distributed with respect to the first cutting edge 22, so that the stability of the cutter during rotation can be ensured, and the cutter chattering phenomenon during milling can be prevented.
In this embodiment, each of the third cutting edges 251 is spirally arranged, so that a large enough cutting force can be ensured, thereby improving the machining efficiency.
For convenience of description, each of the third cutting edges 251 located on the same side of the first cutting edge 22 is defined as a cutting edge group 25, and as shown in fig. 2, two cutting edge groups 25 are respectively disposed on the upper and lower sides of the first cutting edge 22; the cutting edge group 25 has a symmetrical structure, and the turning directions of the third cutting edges 251 positioned on one side of the symmetrical center line of the cutting edge group 25 are opposite to the turning directions of the third cutting edges 251 positioned on the other side of the symmetrical center line of the cutting edge group 25, so that the cutting precision can be further improved, and the wear resistance of the tool can be improved to prolong the service life of the tool.
Similarly, in the present embodiment, the helix angle of the third cutting edge 251 is 0 to 80 °, and the helix angle of each third cutting edge 251 in the cutting edge group 25 gradually decreases from two sides to the middle, so that the wear resistance of the tool can be further improved, and the machining precision can be ensured.
In order to ensure the strength of the tool, the third cutting edge 251 is connected with the second cutting edge 23; specifically, one end of the third cutting edge 251 is connected to the second cutting edge 23, and the other end of the third cutting edge 251 is disposed on the outer surface of the cutting body 21.
As an alternative to the above solution, the third cutting edge 251 may be extended to the outer side surface of the connecting portion 1, so that the machining range of the tool can be increased; for example, both end portions of the first cutting edge 22 and the second cutting edge 23 also extend to the outer side surface of the connecting portion 1.
Exemplarily, in the present embodiment, 6 third cutting edges 251 are respectively provided on both sides of the first cutting edge 22; the number of the third cutting edges 251 may be increased appropriately to improve the machining accuracy.
In this embodiment, the outer surface of the cutting body 21 is a hemispherical surface, and the connecting portion 1 is a cylindrical structure having the same diameter as the cutting body 21.
In this embodiment, the cutting body 21, the first cutting edge 22, the second cutting edge 23, and the third cutting edge 251 are integrally formed, so that the cutting edges are easily formed on the outer surface of the cutting body 21, and the overall wear resistance and the overall strength of the cutting edge portion 2 can be ensured.
In this embodiment, the material of cutting edge portion 2 is preferably polycrystalline diamond, and the cutter of integral polycrystalline diamond structure is for traditional coating milling cutter, and wear resistance has obtained increasing substantially, effectively improves machining precision and machining efficiency, and can prolong the life of cutter.
Similarly, the material of the cutting edge portion 2 may be single crystal diamond, chemical vapor deposition diamond, polycrystalline cubic boron nitride, ceramic, cemented carbide, or the like, and the wear resistance of the tool can be ensured as well.
Cutting edge portion 2 with connecting portion 1's material is the same, just cutting edge portion 2 with connecting portion 1 adopts integrated into one piece, can guarantee the intensity of whole tool bit structure 100.
Example two
The present embodiment also proposes a cutting head structure 100, as shown in fig. 4 in particular, which differs from the first embodiment only in that six second cutting edges are provided on the cutting body 21 in the present embodiment, three second cutting edges are respectively provided on both sides of the first cutting edge 22, and a third chip flute 27 is defined between two adjacent second cutting edges.
Similarly, two, four, or more than four second cutting edges 23 may be disposed on two sides of the first cutting edge 22, and the second cutting edges 23 may be arranged at intervals.
The second aspect of the present invention further provides a cutting tool, specifically referring to fig. 5, comprising a tool shank 200 and a tool bit structure 100 according to any one of the embodiments of the first aspect, wherein the rear end surface of the connecting portion 1 is connected to the front end surface of the tool shank 200.
The utility model discloses cutting tool in the well embodiment, owing to the tool bit structure 100 including any embodiment of the first aspect, consequently have all beneficial effects of tool bit structure 100, do not describe herein any more.
In addition, it should be noted that the cutting tool in the embodiment of the present invention is mainly used for processing graphite molds; when the cutting tool is rotated, the second cutting edge 23 and the third cutting edge 251 can remove most of the allowance in the workpiece during the rotation feeding process, and the remaining machining allowance of about 0.01mm is press-machined by the first cutting edge 22, which has the property of rough machining before finish machining, and the waste chips generated during the milling process are discharged outwards through the first chip discharge groove 24 and the second chip discharge groove 26, respectively.
When the cutting tool in the embodiment is used for processing the graphite mold, the tool can continuously process 5 or more than 5 graphite molds, and the traditional tungsten steel coating ball cutter can only process 1-2 graphite molds generally; and the surface roughness stability of each processed graphite mould is high and can reach below 500 nm.
To sum up, the embodiment of the present invention provides a cutting tool and a tool bit structure thereof, which can improve the surface roughness of a workpiece and prolong the service life of a first cutting edge by arranging the first cutting edge and a plurality of second cutting edges located at two sides of the first cutting edge on a cutting main body and matching the cutting action of the second cutting edges and the extrusion action of the first cutting edge; and the first chip removal groove defined between the first cutting edge and the second cutting edge is gradually widened from the middle area to two ends, so that the chip removal performance can be ensured, and the situation that waste chips are accumulated in the top area of the cutting main body in the milling process is prevented, so that the adverse effect on the machining precision is avoided.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.
Claims (20)
1. A cutter head structure is characterized by comprising a cutting edge part, wherein the cutting edge part comprises a cutting main body, the outer surface of the cutting main body is a cambered surface protruding forwards, a first cutting edge and at least two second cutting edges are arranged on the outer surface of the cutting main body,
the first cutting edge extends from one side of the cutting body to the top area of the cutting body and then extends to the other side of the cutting body, the second cutting edges are respectively arranged at two sides of the first cutting edge, a first chip discharge groove is defined between the first cutting edge and the second cutting edge adjacent to the first cutting edge, and the width of the first chip discharge groove is gradually increased from the top area of the cutting body to two ends;
the second cutting edge includes a first cutting segment and a second cutting segment, the first cutting segment extends from one side of the cutting body to a top region thereof and then is connected to one end of the second cutting segment, and the second cutting segment extends from the top region of the cutting body to the other side of the cutting body.
2. The cutter head structure of claim 1 wherein said first cutting edge passes through an apex of said cutting body and said cutting body is symmetrically disposed about said first cutting edge.
3. The cutter head structure of claim 2 wherein each of said second cutting edges is symmetrically disposed about said first cutting edge.
4. The cutter head structure of claim 2 wherein said second cutting edge is arcuate and convex toward said first cutting edge.
5. The cutter head structure of claim 4 wherein said first cutting segment and said second cutting segment are helical and wherein the direction of rotation of said first cutting segment is opposite to the direction of rotation of said second cutting segment.
6. The cutter head structure of claim 5 wherein the helix angles of the first cutting segment and the second cutting segment are each 0 to 80 °.
7. The bit structure of claim 2 wherein said first cutting edge is flanked by said second cutting edges.
8. The cutter head structure according to claim 1, wherein the diameter of the cutting body is 0.2mm to 20mm, the edge width of the first cutting edge and the second cutting edge is 0.005mm to 0.2mm, and the groove depth of the first chip groove is 0.05mm to 1 mm.
9. The cutter head structure of claim 1 wherein said cutting body, said first cutting edge and said second cutting edge are integrally formed.
10. A cutter head structure as claimed in any one of claims 1 to 9, wherein the outer surface of the cutting body is further provided with a plurality of third cutting edges, each of the third cutting edges being disposed outwardly of the outermost two of the second cutting edges, and second chip flutes being defined between adjacent ones of the third cutting edges and between the third cutting edge and the adjacent one of the second cutting edges.
11. The cutter head structure of claim 10 wherein each of said third cutting edges is symmetrically disposed about said first cutting edge.
12. The cutter head structure of claim 10 wherein each of said third cutting edges is helical.
13. The bit structure of claim 12, wherein each of said third cutting edges on the same side of said first cutting edge is a cutting edge set, said cutting edge set is of a symmetrical configuration, and each of said third cutting edges on one side of a center line of symmetry of said cutting edge set is oppositely handed from each of said third cutting edges on the other side of the center line of symmetry of said cutting edge set.
14. The tool bit structure of claim 13, wherein the helix angle of the third cutting edge is 0 to 80 °, and the helix angle of each of the third cutting edges in the set of cutting edges decreases from side to side.
15. The cutter head structure of claim 10, wherein one end of said third cutting edge is connected to said second cutting edge, and the other end of said third cutting edge is disposed on the outer surface of said cutting body.
16. The bit structure of claim 1 wherein the outer surface of the cutting body is hemispherical.
17. The cutter head structure according to claim 1, wherein 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.
18. The cutter head structure of claim 1 further comprising a connecting portion, the rear end face of the cutting body being connected to the front end of the connecting portion.
19. The cutter head structure of claim 18 wherein said cutting edge portion and said connecting portion are of the same material and are integrally formed.
20. A cutting tool comprising a tool shank and a bit structure according to any one of claims 1 to 18, wherein the rear end face of the cutting body is attached to the front end of the tool shank.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921395395.4U CN210648706U (en) | 2019-08-26 | 2019-08-26 | Cutting tool and tool bit structure thereof |
| PCT/CN2019/104177 WO2021035770A1 (en) | 2019-08-26 | 2019-09-03 | Cutting tool and tool bit structure thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921395395.4U CN210648706U (en) | 2019-08-26 | 2019-08-26 | Cutting tool and tool bit structure thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110421202A (en) * | 2019-08-26 | 2019-11-08 | 汇专绿色工具有限公司 | A kind of cutting tool and its cutter head structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110421202A (en) * | 2019-08-26 | 2019-11-08 | 汇专绿色工具有限公司 | A kind of cutting tool and its cutter head structure |
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