CN218656966U - Drilling tool - Google Patents
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- CN218656966U CN218656966U CN202222266322.3U CN202222266322U CN218656966U CN 218656966 U CN218656966 U CN 218656966U CN 202222266322 U CN202222266322 U CN 202222266322U CN 218656966 U CN218656966 U CN 218656966U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The utility model discloses a drilling tool, the drilling tip of drilling tool can carry out the pre-drilling, the pyramis can guarantee the pass of drilling to be the toper, drilling tool can directly form the bell mouth, need not to change the cutter many times and process out the bell mouth, can reduce work load and improve the machining precision of bell mouth, thus improve the machining efficiency of bell mouth; the angle of the taper angle alpha is set to be more than or equal to 25 degrees and less than or equal to 35 degrees, the hole type of the tapered hole and the roughness of the hole wall can still be ensured within the design range after the taper part is ground and drilled for many times, the angle of the drill point angle beta is set to be more than the angle of the taper angle alpha and less than 180 degrees, the function of pre-drilling can be achieved, and the problem that the drill point angle beta is too small to form a countersunk hole at the bottom of the tapered hole can be prevented.
Description
Technical Field
The utility model relates to a processing cutter technical field especially relates to a drilling tool.
Background
The taper hole is a common hole pattern in machining, in order to process the taper hole, at present, a drill bit is generally used for drilling a round hole, then the round hole is reamed, then a reducing boring cutter is used for rotatably cutting out the taper hole or reaming out the taper hole by using a reamer, the boring cutter or the reamer is easy to wear and tear and is easy to scrap, the utilization rate of the boring cutter or the reamer is low, and the processing amount is small; the drilling process of the taper hole is complicated, the cutter needs to be frequently replaced in the machining process, the workload is increased, the machining efficiency is low, and the cutter replacement in the drilling process is easy to increase clamping errors, so that the machining errors of the taper hole are large.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a drilling tool need not to change the cutter many times, can guarantee the toper in processing hole, reduce work load and improve machining efficiency.
In order to achieve the above object, the present invention provides a drilling tool, including a straight shank portion and a drilling portion which are coaxially disposed, wherein the straight shank portion is connected to the drilling portion, a chip discharge groove is concavely formed on an outer side wall of the drilling portion, the chip discharge groove spirally surrounds a central axis of the drilling portion, a blade connected to an outer edge of the chip discharge groove is further formed on the outer side wall of the drilling portion, and the blade spirally surrounds the central axis of the drilling portion;
the drilling part comprises a drilling tip and a conical part which are far away from the straight shank part and are coaxially connected, the drilling tip is far away from the straight shank part relative to the conical part, the outer surface of the conical part is positioned on a rotary curved surface taking the central shaft as a rotating shaft, the outer surface of the conical part is provided with a first end and a second end which are distributed along the axial direction of the central shaft, the first end of the outer surface of the conical part is connected with the cutting edge, the second end of the outer surface of the conical part is connected with the drilling tip, a generatrix of the rotary curved surface is a straight line segment which is inclined towards the central shaft, and the distance from the generatrix to the central shaft is gradually increased from the second end to the first end;
the drilling tip is formed with a point angle β having an angle of taper α greater than and less than 180 ° and greater than or equal to 25 ° and less than or equal to 35 °.
Optionally, the drilling tip has a first cutting surface and a second cutting surface connected to each other, and a chisel edge, the first cutting surface and the second cutting surface are centrosymmetric along the central axis, an included angle between the first cutting surface and the second cutting surface is the drill point angle β, and the chisel edge is formed at a connecting position of the first cutting surface and the second cutting surface;
the first cutting face having a first cutting edge connected to the chisel edge and a first side opposite the chisel edge, the second cutting face having a second cutting edge connected to the chisel edge and a second side opposite the chisel edge, the first and second cutting edges being centrosymmetric along the central axis;
the drilling part is provided with two chip grooves which are centrosymmetric along the central axis, and two blade zones which are centrosymmetric along the central axis are formed between the two chip grooves; the first cutting edge and the second cutting edge are respectively formed on the two chip grooves; the taper portion forms a first portion and a second portion that are symmetrical about the center axis, a first end of an outer surface of the first portion and a first end of an outer surface of the second portion are connected to the two lands, respectively, and a second end of the first portion and a second end of the second portion are connected to the first side and the second side, respectively.
Optionally, the lengths of the first cutting surface and the second cutting surface are first length l 1 First edge length l 1 The distance from the center point of the chisel edge to the intersection point of the first cutting edge and the first side edge; the edge length of the pyramid part is a second edge length l 2 Said second edge length l 2 The length of the generatrix of the rotating curved surface is l 1 And said second edge length l 2 The relationship of (1) is:
l 1< l 2
optionally, the taper angle α, the point angle β, and the first edge length l 1 And said second edge length l 2 The relationship of (c) is:
and R is the distance from one end of the bus bar far away from the drilling tip to the central shaft.
Optionally, a distance R from one end of the bus bar, which is far away from the drilling tip, to the central shaft is greater than or equal to 0.05mm and less than or equal to 0.35mm.
Optionally, the drilling tip has a peripheral tooth relief angle δ, the peripheral tooth relief angle δ is an included angle between a perpendicular line of a connecting line between the intersection point of the first cutting edge and the first side edge and the center point of the chisel edge and a tangent line passing through the intersection point of the first cutting edge and the first side edge, and the peripheral tooth relief angle δ is greater than or equal to 25 ° and less than or equal to 35 °.
Optionally, the drilling tip has a first relief angle γ, the perpendicular plane of the central axis, the first relief angle γ being an included angle between the first cutting surface and the perpendicular plane and the second cutting surface; a helix angle θ of the flute is greater than or equal to 25 ° and less than or equal to 30 °, and a relationship between the helix angle θ and the first relief angle γ is: γ =40 ° - θ.
Optionally, the first cutting surface is further formed with a third side edge opposite to the first cutting edge and connected to the first side edge and the chisel edge, the second cutting surface is further formed with a fourth side edge opposite to the second cutting edge and connected to the second side edge and the chisel edge, and the third side edge and the fourth side edge are centrosymmetric along the central axis;
the projections of the first side edge and the second side edge on the end surface of the drilling tip are circular arcs, and the circular arcs projected on the end surface of the first side edge are close to the center point of the chisel edge from one end connected with the first cutting edge to one end connected with the third side edge; the second side edge projects on the arc of the end face from one end connected with the second cutting edge to one end connected with the fourth side edge, and the arc is close to the center point of the chisel edge.
The utility model discloses an among the drilling tool, drilling point portion can carry out the pre-drilling, and the pass that the pyramis can guarantee drilling is the toper, and drilling tool can directly form the bell mouth, need not to change the cutter many times and processes out the bell mouth, can reduce work load and improve the machining precision of bell mouth to improve the machining efficiency of bell mouth. The angle of the taper angle alpha is set to be more than or equal to 25 degrees and less than or equal to 35 degrees, the hole type of the tapered hole and the roughness of the hole wall can still be ensured within the design range after the taper part is ground and drilled for many times, the angle of the drill point angle beta is set to be more than the angle of the taper angle alpha and less than 180 degrees, the function of pre-drilling can be achieved, and the problem that the drill point angle beta is too small to form a countersunk hole at the bottom of the tapered hole can be prevented.
Drawings
Fig. 1 is a schematic structural view of a drilling tool according to an embodiment of the present invention.
Fig. 2 is an enlarged view of a portion a in fig. 1.
Fig. 3 is a schematic structural diagram of another view angle of the drilling tool according to the embodiment of the present invention.
Fig. 4 is an enlarged view of a portion B in fig. 3.
Fig. 5 is a schematic end view of a drilling tip of a drilling tool according to an embodiment of the present invention.
Fig. 6 is an enlarged view of a portion C in fig. 5.
Detailed Description
In order to explain technical contents, structural features, and effects achieved by the present invention in detail, the following description is given in conjunction with the embodiments and the accompanying drawings.
As shown in fig. 1 to 6, the embodiment of the present invention discloses a drilling tool 1, which includes a straight shank 10 and a drilling portion 20 coaxially disposed, the straight shank 10 is connected to the drilling portion 20, a flute 21 is concavely formed on an outer side wall of the drilling portion 20, the flute 21 spirally surrounds a central axis (shown as a dotted line in fig. 1) of the drilling portion 20, a land 22 connected to an outer edge of the flute 21 is further formed on an outer side wall of the drilling portion 20, and the land 22 spirally surrounds the central axis of the drilling portion 20; the drilling portion 20 comprises a drilling tip portion 23 and a taper portion 24 which are far away from the straight shank portion 10 and are coaxially connected, the drilling tip portion 23 is far away from the straight shank portion 10 relative to the taper portion 24, the outer surface of the taper portion 24 is positioned on a rotating curved surface which takes a central axis as a rotating shaft (namely, the outer surface of the taper portion 24 is a part of the rotating curved surface), the outer surface of the taper portion 24 is provided with a first end and a second end which are distributed along the axial direction of the central axis, the first end of the outer surface of the taper portion 24 is connected with a cutting edge 22, the second end of the outer surface of the taper portion 24 is connected with the drilling tip portion 23, a generatrix of the rotating curved surface is a straight line segment which is inclined towards the central axis, and the distance from the generatrix to the central axis gradually increases from the second end of the rotating curved surface to the first end of the rotating curved surface; the drilling tip 23 is formed with a point angle β, the conical portion 24 has a cone angle α, the angle of the point angle β is greater than the angle of the cone angle α and less than 180 °, and the angle of the cone angle α is greater than or equal to 25 ° and less than or equal to 35 °. Wherein the point angle β is the angle formed by the end of the drilling tip 23 intended for drilling (i.e. the end remote from the cone 24).
The embodiment of the utility model provides an in boring tool 1, drilling point portion 23 can carry out the pre-drilling, and the pass that drilling can be guaranteed to pyramis 24 is the toper, therefore boring tool 1 can directly form the bell mouth, need not to change the cutter many times and process out the bell mouth, can reduce work load and improve the machining precision of bell mouth to can improve the machining efficiency of bell mouth. The angle of the taper angle alpha is set to be more than or equal to 25 degrees and less than or equal to 35 degrees, so that the taper part 24 can still ensure the hole type of the tapered hole and the roughness of the hole wall to be within the design range after grinding and drilling for many times, and the angle of the drill point beta is set to be more than the angle of the taper angle alpha and less than 180 degrees, so that the function of pre-drilling can be achieved, and the problem that the drill point beta is too small to form a countersunk hole at the bottom of the tapered hole can be prevented.
It will be appreciated that the closer the angle of the point angle β is to 180 °, the less likely it is to form a counter bore, which is advantageous for improving the flatness of the bottom of the tapered hole, but in order to ensure the drilling ability of the drilling tip 23, the point angle β is set to less than 180 °.
Preferably, the angle of the taper angle α may be set to 30 °, and the angle of the point angle β may be set to 165 °.
It will be appreciated that the straight shank portion 10 and the drilling portion 20 may be connected by at least one transition portion to enhance the overall strength of the drilling tool 1. As shown in fig. 1 and 3, one end of the straight shank portion 10 close to the drill hole portion 20 is connected to one end of a first transition portion 25, the other end of the first transition portion 25 is connected to one end of a reinforcing support portion 26, the other end of the reinforcing support portion 26 is connected to one end of a second transition portion 27, the other end of the second transition portion 27 is connected to the drill hole portion 20, the first transition portion 25 and the second transition portion 27 are in a circular truncated cone shape, the reinforcing support portion 26 is in a cylindrical shape, the diameter of the first transition portion 25 is reduced from the straight shank portion 10 to the reinforcing support portion 26, the diameter of the end of the first transition portion 25 connected to the straight shank portion 10 is the same as the diameter of the straight shank portion 10, and the diameter of the other end of the first transition portion 25 is the same as the diameter of the reinforcing support portion 26; the diameter of the second transition portion 27 decreases from the reinforcing support portion 26 to the drilling portion 20, the diameter of one end of the second transition portion 27 connected to the reinforcing support portion 26 is the same as that of the reinforcing support portion 26, and the diameter of the other end of the second transition portion 27 is the same as that of the drilling portion 20.
As shown in fig. 2 and 6, the drilling tip 23 has a first cutting surface 230 and a second cutting surface 231, the first cutting surface 230 and the second cutting surface 231 are centrosymmetric along the central axis, the included angle between the first cutting surface 230 and the second cutting surface 231 is the point angle β of the drilling tip 23, and a chisel edge 232 is formed at the connecting position of the first cutting surface 230 and the second cutting surface 231; the first cutting surface 230 has a first cutting edge 2302 connected to the chisel edge 232 and a first side edge 2301 opposite to the chisel edge 232, the second cutting surface 231 has a second cutting edge 2312 connected to the chisel edge 232 and a second side edge 2311 opposite to the chisel edge 232, the first cutting edge 2302 and the second cutting edge 2312 are centrosymmetric along the central axis; the drilling part 20 is provided with two chip grooves 21 which are symmetrical along the center of the central shaft, and two blade bands 22 which are symmetrical along the center of the central shaft are formed between the two chip grooves 21; the first cutting edge 2302 and the second cutting edge 2312 are respectively formed at the two chip flutes 21; the tapered portion 24 forms a first portion 241 and a second portion 242 which are symmetrical about the central axis, a first end of the outer surface of the first portion 241 and a first end of the outer surface of the second portion 242 are connected to the two tapes 22, respectively, and a second end of the outer surface of the first portion 241 and a second end of the outer surface of the second portion 242 are connected to the first side 2301 and the second side 2311, respectively. The boring tool 1 of the present embodiment forms two chip flutes 21, a two-edged land 22, a drilling tip 23 having a first cutting face 230 and a second cutting face 231, and a taper 24 forming a first portion 241 and a second portion 242, and forms the boring tool 1 of two edges, and can improve the drilling speed and the drilling smoothness of the boring tool 1.
Of course, in the drilling tool 1 according to the embodiment of the present invention, the drilling portion 20 is not limited to two chip grooves 21 and two lands 22, and only one chip groove 21 may be provided and one land 22 may be formed.
As shown in FIG. 2, the first cutting surface 230 and the second cutting surface 231 have a cutting edge length of a first cutting edge length l 1 First edge length l 1 The distance from the center point of the chisel edge 232 to the intersection of the first cutting edge 2302 and the first side edge 2301 (first edge length l) 1 Also the distance from the center point of the chisel edge 232 to the intersection of the second cutting edge 2312 and the second side edge 2311); the edge length of the tapered portion 24 is the second edge length l 2 Second edge length l 2 The length of the generatrix of the surface of revolution, first edge length l 1 And a second edge length l 2 The relationship of (1) is:
l 1< l 2
can make the degree of depth of counter sink littleer as far as possible, guarantee that pass and depth of hole satisfy the processing requirement, still need carry out laser to the bottom of bell mouth and improve bottom roughness after processing out the bell mouth with drilling tool 1, first sword length l 1 And a second edge length l 2 The relation can also reduce the medium amount that laser needs to be removed, and improve the laser processing efficiency. It will be appreciated that the first portion 241 and the second portion 242 of the taper 24 are symmetrical about the central axis, and therefore the length of the busbars on the first portion 241 and the second portion 242 are the same.
It will be appreciated that the tapered hole is formed with a hole depth h which satisfies
Therefore, when the hole depth and the taper of the tapered hole to be processed by the boring tool 1 are known, the second blade length l of the boring tool 1 can be set according to the hole depth and the taper 2 And a taper angle alpha.
Further, a taper angle α, a point angle β, a first edge length l 1 And a second edge length l 2 The relationship of (c) is:
where R is the distance from the end of the generatrix remote from the drilling tip 23 to the central axis. Angle alpha, point angle beta, first edge length l 1 And a second edge length l 2 When satisfying above-mentioned relation, can guarantee the shape of boring tool 1's pyramis 24, according to the processing requirement of different R and hole depth h, make and pass through the utility model discloses the tapering of the pass of boring tool 1 processing satisfies the processing requirement.
Further, a distance R from one end of the generatrix of the surface of revolution away from the drilling tip 23 to the central axis is greater than or equal to 0.05mm and less than or equal to 0.35mm.
As shown in fig. 6, the drilling tip 23 has a peripheral tooth relief angle δ, which is an angle between a perpendicular line to a line connecting an intersection point of the first cutting edge 2302 and the first side edge 2301 of an end surface of the drilling tip 23 with a center point of the chisel edge 232 and a tangent line of an intersection point of the first cutting edge 2302 and the first side edge 2301, and the peripheral tooth relief angle δ is greater than or equal to 25 ° and less than or equal to 35 °. The larger the angle of the peripheral tooth clearance angle delta is, the smaller the contact area between the first side edge 2301 and the second side edge 2311 of the drilling tip 23 and the hole wall of the tapered hole is, the friction between the first side edge 2301 and the second side edge 2311 to the hole wall can be reduced, the quality of the hole wall is improved, but if the angle of the peripheral tooth clearance angle delta is too large, the rigidity of the drilling tip 23 and the pyramid 24 can be reduced, the wear resistance of the drilling tip 23 and the pyramid 24 is reduced, the angle of the peripheral tooth clearance angle delta can be set to be larger than or equal to 25 degrees and smaller than or equal to 35 degrees, the friction between the first side edge 2301 and the second side edge 2311 to the hole wall can be reduced, the quality of the hole wall is improved, and the rigidity of the drilling tip 23 and the pyramid 24 can be ensured.
It should be noted that the end surface of the drilling tip 23 refers to a plane passing through the center point of the chisel edge 232 and perpendicular to the central axis of the drilling tool, and the first cutting edge 2302, the first side 2301 and the chisel edge 232 on the end surface of the drilling tip 23 refer to the projection of the first cutting edge 2302, the first side 2301 and the chisel edge 232 of the drilling tip 23 on the end surface of the drilling tip 23, that is, the tooth clearance angle δ is: the angle between the intersection of the first cutting edge 2302 and the first side 2301 projected on the end surface and the perpendicular line connecting the center points of the chisel edge 232 and the tangent line passing through the intersection of the first cutting edge 2302 and the first side 2301 projected on the end surface, that is, the peripheral tooth clearance angle δ is formed at the end surface of the drilling tip 23.
Similarly, the peripheral tooth relief angle δ may be an angle between a perpendicular line of a connecting line between the intersection point of the second cutting edge 2312 and the second side edge 2311 and the center point of the chisel edge 232 at the end surface of the drilling tip 23 and a tangent line passing through the intersection point of the second cutting edge 2312 and the second side edge 2311.
As shown in fig. 4, the drilling tip 23 has a first relief angle γ as a vertical plane of the central axis, the first relief angle γ being an angle between the first cutting surface 230 and the second cutting surface 231 and the vertical plane; the helix angle θ of the flute 21 is 25 ° or more and 30 ° or less, and the relationship between the helix angle θ and the first relief angle γ is: γ =40 ° - θ to ensure the strength of the boring tool 1 and the sharpness of the boring tool 1. As the first relief angle γ is an angle between the first cutting surface 230 or the second cutting surface 231 and the vertical plane, the relationship between the first relief angle γ and the drill point β is as follows: β =180 ° -2 γ, it can be obtained that the point angle β is greater than or equal to 150 ° and less than or equal to 160 °, and therefore, the first relief angle γ and the point angle β can be solved in order from the helix angle θ.
As shown in fig. 6, the first cutting surface 230 is further formed with a third side edge 2303 opposite to the first cutting edge 2302 and connected to the first side edge 2301 and the chisel edge 232, the second cutting surface 231 is further formed with a fourth side edge 2313 opposite to the second cutting edge 2312 and connected to the second side edge 2311 and the chisel edge 232, and the third side edge 2303 and the fourth side edge 2313 are centrosymmetric along the central axis; the projections of the first side 2301 and the second side 2311 on the end surface of the drilling tip are circular arcs, and the circular arc of the first side 2301 projected on the end surface is close to the center point of the chisel edge 232 from the end connected with the first cutting edge 2302 to the end connected with the third side 2303; the arc of second side edge 2311 projection at the terminal surface is close to the central point of chisel edge 232 from the one end connected with second cutting edge 2312 to the one end connected with fourth side edge 2313 to reduce first side edge 2301 and second side edge 2311 and the pore wall contact, reduce the friction of first side edge 2301 and second side edge 2311 and pore wall, promote the pore wall quality.
The above disclosure is only a preferred embodiment of the present invention, and certainly, the scope of the present invention should not be limited thereto, and therefore, the scope of the present invention is not limited to the above embodiments.
Claims (8)
1. A drilling tool is characterized by comprising a straight shank part and a drilling part which are coaxially arranged, wherein the straight shank part is connected with the drilling part, a chip groove is concavely formed on the outer side wall of the drilling part, the chip groove spirally surrounds the central shaft of the drilling part, a blade connected with the outer edge of the chip groove is further formed on the outer side wall of the drilling part, and the blade spirally surrounds the central shaft of the drilling part;
the drilling part comprises a drilling tip and a conical part which are far away from the straight shank part and are coaxially connected, the drilling tip is far away from the straight shank part relative to the conical part, the outer surface of the conical part is positioned on a rotary curved surface taking the central shaft as a rotating shaft, the outer surface of the conical part is provided with a first end and a second end which are distributed along the axial direction of the central shaft, the first end of the outer surface of the conical part is connected with the cutting edge, the second end of the outer surface of the conical part is connected with the drilling tip, a generatrix of the rotary curved surface is a straight line segment which is inclined towards the central shaft, and the distance from the generatrix to the central shaft is gradually increased from the second end to the first end;
the drilling tip is formed with a point angle β, the conical section having a cone angle α, the angle of the point angle β being greater than the angle of the cone angle α and less than 180 °, the angle of the cone angle α being greater than or equal to 25 ° and less than or equal to 35 °.
2. The drilling tool as claimed in claim 1, wherein said drilling tip has first and second cutting faces connected to each other and a chisel edge, said first and second cutting faces being centrally symmetric along said central axis, said first and second cutting faces having an included angle of said point angle β, said chisel edge being formed at a location where said first and second cutting faces are connected;
the first cutting face having a first cutting edge connected to the chisel edge and a first side opposite the chisel edge, the second cutting face having a second cutting edge connected to the chisel edge and a second side opposite the chisel edge, the first and second cutting edges being centrosymmetric along the central axis;
the drilling part is provided with two chip grooves which are centrosymmetric along the central axis, and two blade zones which are centrosymmetric along the central axis are formed between the two chip grooves; the first cutting edge and the second cutting edge are respectively formed on the two chip grooves; the taper portion forms a first portion and a second portion that are symmetrical about the center axis, a first end of an outer surface of the first portion and a first end of an outer surface of the second portion are connected to the two lands, respectively, and a second end of the first portion and a second end of the second portion are connected to the first side and the second side, respectively.
3. The drilling tool of claim 2, wherein the lengths of the first and second cutting faces are a first length l 1 First edge length l 1 The distance from the center point of the chisel edge to the intersection of the first cutting edge and the first side edge; the edge length of the pyramid part is a second edge length l 2 Said second edge length l 2 The length of the generatrix of the rotating curved surface is l 1 And said second edge length l 2 The relationship of (1) is:
l 1 <l 2 。
4. a drilling tool as claimed in claim 3, characterized in that the cone angle a, the point angle β, the first angle of attack α, and the second angle of attack β are different from each otherLength of edge l 1 And said second edge length l 2 The relationship of (1) is:
and R is the distance from one end of the bus bar far away from the drilling tip to the central shaft.
5. The drilling tool as claimed in claim 4, wherein a distance R from an end of the generatrix remote from the drilling tip to the central axis is 0.05mm or more and 0.35mm or less.
6. The drilling tool as claimed in claim 2, wherein the drilling tip has a peripheral tooth relief angle δ being an angle between a perpendicular to a connecting line of an intersection point of the first cutting edge and the first side edge of the end surface of the drilling tip with the center point of the chisel edge and a tangent line passing through the intersection point of the first cutting edge and the first side edge, the peripheral tooth relief angle δ being 25 ° or more and 35 ° or less.
7. The drilling tool as claimed in claim 2, wherein said drilling tip has a first relief angle γ taken as a normal to said central axis, said first relief angle γ being the angle between said first cutting surface and said second cutting surface and said normal; a helix angle θ of the flute is 25 ° or more and 30 ° or less, and a relationship between the helix angle θ and the first relief angle γ is: γ =40 ° - θ.
8. The drilling tool as set forth in claim 2 wherein said first cutting face is further formed with a third side opposite said first cutting edge and connected to said first side and said chisel edge, said second cutting face is further formed with a fourth side opposite said second cutting edge and connected to said second side and said chisel edge, said third and fourth sides being centrally symmetric along said central axis;
the projections of the first side edge and the second side edge on the end surface of the drilling tip are circular arcs, and the circular arcs projected on the end surface of the first side edge are close to the center point of the chisel edge from one end connected with the first cutting edge to one end connected with the third side edge; the second side edge projects on the arc of the end face from one end connected with the second cutting edge to one end connected with the fourth side edge, and the arc is close to the center point of the chisel edge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222266322.3U CN218656966U (en) | 2022-08-25 | 2022-08-25 | Drilling tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222266322.3U CN218656966U (en) | 2022-08-25 | 2022-08-25 | Drilling tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218656966U true CN218656966U (en) | 2023-03-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222266322.3U Active CN218656966U (en) | 2022-08-25 | 2022-08-25 | Drilling tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218656966U (en) |
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2022
- 2022-08-25 CN CN202222266322.3U patent/CN218656966U/en active Active
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