CN108057918B - PCB miniature drill bit - Google Patents
PCB miniature drill bit Download PDFInfo
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- CN108057918B CN108057918B CN201711473072.8A CN201711473072A CN108057918B CN 108057918 B CN108057918 B CN 108057918B CN 201711473072 A CN201711473072 A CN 201711473072A CN 108057918 B CN108057918 B CN 108057918B
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- edge
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- 238000005520 cutting process Methods 0.000 claims abstract description 209
- 238000005299 abrasion Methods 0.000 abstract description 7
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000005553 drilling Methods 0.000 description 11
- 230000009286 beneficial effect Effects 0.000 description 9
- 238000001125 extrusion Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000003292 glue Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/02—Twist drills
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling Tools (AREA)
Abstract
The invention provides a PCB micro drill bit, which is characterized by comprising a multi-stage cutting edge and a plurality of first main rear cutter surfaces, wherein the main rear cutter surfaces and the cutting edges are corresponding and equal in number, and the included angle between the main rear cutter surfaces and the central axis of the drill bit is gradually reduced from the position close to the drill point to the position far from the drill point; the tool comprises a chisel edge and a rear tool face corresponding to the cutting edge, wherein the first cutting edge to the nth cutting edge are arranged near the drill point in sequence, and the corresponding first rear tool face to the nth rear tool face respectively correspond to the cutting edge along the chip removal groove of the spiral of the drill body. According to the invention, through the structural design of multiple drill point angles, the cutting capacity of the cutting edge is improved, the abrasion of the auxiliary cutting edge is reduced, the service life of the drill bit is prolonged, and the cutting capacity of the auxiliary cutting edge is ensured, so that Kong Cu is less. The prismatic belt can improve the space of the chip removal groove and the chip removal capacity.
Description
Technical Field
The invention belongs to the technical field of PCB processing, and particularly relates to a PCB micro drill bit.
Background
With the development of the electronic industry, the technology of manufacturing micro-holes of a printed circuit board determines the integration degree of an electronic product. At present, most of micro-hole manufacturing of the printed circuit board adopts a mechanical drilling mode, the diameter of a drill used by the micro-hole manufacturing device is generally smaller, and the failure rate of the drill is also higher. The material used for the PCB micro-drill is generally hard alloy, and the manufacturing cost is increased along with the reduction of the diameter of the drill due to the small drilling diameter. At present, the micro drill bit is mainly used for discharging drill cuttings by adopting the design of spiral grooves, the secondary cutting edge part of the drill bit does not generally conduct cutting motion on the hole wall, drilling dirt generated in the drilling process can be adhered to the hole wall due to extrusion, and secondly, the quality of the hole wall is affected by cutting in the rotating process of a cutter, and the subsequent copper plating and other processes are affected. The micro drill bit has obvious cutting edge abrasion of the drill tip after being processed, the abrasion degree is radially increased, the micro drill bit with the abrasion degree of more than 0.2mm is generally used continuously by a regrinding mode, and the micro drill bit with the abrasion degree of less than 0.1mm is less regrinded. The drill bit can effectively improve the quality of the microporous wall and the chip removal effect, reduce abrasion and prolong the service life of the drill bit.
Disclosure of Invention
In view of the above, the invention provides a micro drill PCB micro drill with better roughness of the processed hole wall, long service life and good chip removal capability, and the invention improves the cutting capability of the cutting edge, reduces the abrasion of the auxiliary cutting edge, improves the service life of the drill, ensures the cutting capability of the auxiliary cutting edge and is less Kong Cu through the structural design of multiple drill point angles. The prismatic belt can improve the space of the chip removal groove and the chip removal capacity.
The technical scheme of the invention is as follows:
A PCB miniature drill bit is characterized by comprising a multi-stage cutting edge and a plurality of first main rear cutter surfaces, wherein the main rear cutter surfaces and the cutting edges are corresponding and equal in number, and the included angle between the main rear cutter surfaces and the central axis of the drill bit is gradually reduced from the position close to the drill point to the position far from the drill point; the tool comprises a chisel edge and a rear tool face corresponding to the cutting edge, wherein the first cutting edge to the nth cutting edge are arranged near the drill point in sequence, and the corresponding first rear tool face to the nth rear tool face respectively correspond to the cutting edge along the chip removal groove of the spiral of the drill body.
Further, the last pair of the cutting edges and the auxiliary cutting edges furthest from the drill center intersect at a point, the main rear tool face furthest from the drill tip and the edge band intersect at one side, the front tool faces corresponding to the multi-step cutting edges are positioned on the same face, and the length of the cutting edges is reduced and increased from the drill tip. In the present invention, the first cutting edge takes on more cutting functions, and the last cutting edge takes on the secondary cutting functions.
Further, the multiple cutting edges correspond to multiple point angles, the point angle corresponding to the cutting edge close to the point is a first point angle, the point angle is from a second point angle to an nth point angle in turn, and the point angle is reduced in size in turn. By this arrangement, the present invention can have a shorter chisel edge and reduce axial forces.
Further, the drill bit is provided with the prismatic belt, and the prismatic belt is arranged along the tail end from the drill point to the cutting edge, so that friction with the hole wall can be reduced, and chip capacity is improved.
Further, the number of the same-edge main cutting edges is 2-5, and in the projection of each cutting edge on the drill point, the cutting edge closest to the drill point accounts for 2/3 of the total length of the cutting edges, and the lengths of the cutting edges are reduced and then increased.
Further, the point angles are sequentially reduced from the point, the point angle of the part close to the point is a first-order point angle, the first-order point angle is 110-130 degrees, each-order descending gradient is 20-60 degrees, and the part is provided with a second-order point angle to a fifth-order point angle.
Furthermore, the longitudinal projection of the drill chisel edge on the drill point accounts for 1/3 of the drill diameter, and the drill point has smaller chisel edge length, so that the extrusion time of the drill point is reduced when the drill point enters the drill, and the axial force is reduced.
Further, the cutting edges are symmetrical with respect to the apex of the drill tip such that the stress of each cutting edge of the drill tip is balanced so as not to cause damage to the drill bit.
The working principle of the invention is as follows:
① The multi-point angle structure design is adopted, the working front angles of the multi-section cutting edges are different, the effective removal amount of cutting can be improved, and the hole wall roughness is reduced.
② The main rear cutters are arranged in a hierarchical mode, chip removal is facilitated, adhesion is reduced, chips generated by cutting edges near the drill point flow away from the main rear cutters to the second-stage main rear cutters, and chip removal is achieved, so that chip removal capacity is improved;
③ The main rear tool face corresponding to the cutting edge farthest from the drill point is connected with the drill body edge belt, so that the chip capacity of the drilling cuttings groove is increased.
Compared with the prior art, the invention has the beneficial technical effects that:
the processing micro drill bit is provided with a plurality of sharp corners, and the printed circuit board can reduce the roughness of the hole wall and the generation of glue slag under the cutting action of a plurality of sections of cutting edges. The drill bit has smaller chisel edge, is beneficial to reducing drilling force, has a prismatic belt, increases the size of a chip removing groove, improves chip containing capacity, is beneficial to chip removing, reduces surface friction, reduces friction with a processed material and the surface of the drill bit, reduces the generation of cutting heat, and improves the service life of the drill bit.
Drawings
FIG. 1 is a schematic view of a micro drill bit according to one embodiment of the present invention;
FIG. 2 is a block diagram of an overall micro-bit according to one embodiment of the present invention;
FIG. 3 is a schematic view of a point angle structure of a micro drill bit according to an embodiment of the present invention;
FIG. 4 is a top view of a micro drill bit provided in accordance with one embodiment of the present invention;
FIG. 5 is a schematic view of a helical flute of a micro-bit according to one embodiment of the present invention;
Wherein, 1, a drill point; 2. a chisel edge; 3. a first relief surface; 4. a first cutting edge; 5. a second relief surface; 6. a second cutting edge; 7. a third relief surface; 8. a third cutting edge; 9. a minor cutting edge; 10. a rake face; 11. chip-containing grooves; 12. a prismatic tape; 13. a cutting edge portion; 14. a drill shank; 15. chip removal groove.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
A PCB miniature drill bit is characterized by comprising a second-order cutting edge and two first main rear cutter surfaces, wherein the included angle between the main rear cutter surfaces and the central axis of the drill bit is gradually reduced from the position close to a drill point 1 to the position far from the drill point;
The tool comprises a chisel edge 2 and a flank surface corresponding to the cutting edge, wherein the first cutting edge 4 and the second cutting edge 6 are arranged near the drill tip in sequence, the corresponding first flank surface 3 and second flank surface 5 respectively correspond to the cutting edge along a chip groove 15 of the spiral of the drill body.
Further, the second cutting edge and the secondary cutting edge 9 which are farthest from the drill center intersect at a point, the third main flank surface and the edge strip 12 which are farthest from the drill tip intersect at one side, the rake surface 11 corresponding to the second-order cutting edge is positioned at the same surface, and the length of the cutting edge is reduced and increased from the drill tip. In the present invention, the first cutting edge takes on more cutting functions and the second cutting edge takes on secondary cutting functions.
Further, the third-order cutting edge corresponds to a plurality of point angles, the point angle corresponding to the cutting edge near the point is a first point angle, the point angle is a second point angle in turn after the first point angle, and the point angle is reduced in size in turn. By this arrangement, the present invention can have a shorter chisel edge and reduce axial forces.
Further, the drill bit is provided with the prismatic belt, and the prismatic belt is arranged along the tail end from the drill point to the cutting edge, so that friction with the hole wall can be reduced, chip capacity is improved, and chip flutes 11 are formed.
Further, the number of the cutting edges is 2, and in the projection of the drill point, the cutting edge closest to the drill point accounts for 2/3 of the total length of the cutting edges, and the length of the cutting edges is reduced and then increased.
Further, the point angles decrease in order from the point, the point angle near the point is a first-order point angle, the first-order point angle is 110 ° to 130 °, each step down gradient is 20 ° to 60 °, and the second-order point angle is provided. In this embodiment, the second-order cutting edges, i.e., the first cutting edge 4 and the second cutting edge 6, respectively, have the corresponding point angles α and β, respectively, in the ranges of 118 ° to 135 ° and 60 ° to 80 °.
Furthermore, the longitudinal projection of the drill chisel edge on the drill point accounts for 1/3 of the drill diameter, and the drill point has smaller chisel edge length, so that the extrusion time of the drill point is reduced when the drill point enters the drill, and the axial force is reduced.
Further, the cutting edges are symmetrical with respect to the apex of the drill tip such that the stress of each cutting edge of the drill tip is balanced so as not to cause damage to the drill bit.
Further, the PCB micro drill further comprises a drill shank 14.
The working principle of the invention is as follows:
① The two sections of cutting edges have different working front angles by adopting the second-order point angle structural design, so that the effective removal amount of cutting can be improved, the hole wall roughness is reduced, and the drilling tool is suitable for plates which are difficult to drill.
② The main rear cutters are arranged in a hierarchical mode, chip removal is facilitated, adhesion is reduced, chips generated by cutting edges near the drill point flow away from the main rear cutters to the second-stage main rear cutters, and chip removal is achieved, so that chip removal capacity is improved;
③ The main rear cutter surface corresponding to the second-order cutting edge is connected with the drill body edge belt, so that the chip capacity of the drilling cuttings groove is increased.
Compared with the prior art, the invention has the beneficial technical effects that:
The processing micro drill bit has a second-order point angle, and the printed circuit board can reduce the roughness of the hole wall and the generation of glue slag under the cutting action of two sections of cutting edges. The drill bit has smaller chisel edge, is beneficial to reducing drilling force, has a prismatic belt, increases the size of a chip removing groove, improves chip containing capacity, is beneficial to chip removing, reduces surface friction, reduces friction with a processed material and the surface of the drill bit, reduces the generation of cutting heat, and improves the service life of the drill bit.
Example 2
A PCB miniature drill bit is characterized by comprising a third-order cutting edge 13 and three first main rear cutter surfaces, wherein the included angle between the main rear cutter surfaces and the central axis of the drill bit is gradually reduced from the position close to a drill point 1 to the position far from the drill point;
The tool comprises a chisel edge 2, a rear tool face corresponding to the cutting edge, a first cutting edge 4, a second cutting edge 6 and a third cutting edge 8 which are arranged near the drill tip in sequence, and a first rear tool face 3, a second rear tool face 5 and a third rear tool face 7 which correspond to each other, wherein chip grooves 15 which are spiral along the drill body correspond to the cutting edges respectively.
Further, the last pair of third cutting edges furthest from the drill center intersects the minor cutting edge 9at a point, the third major relief surface furthest from the drill tip intersects the land 12 at one side, the rake surfaces 11 corresponding to the third-order cutting edges are on the same plane, and the cutting edge lengths decrease and increase from the drill tip. In the present invention, the first cutting edge performs more cutting functions, and the third cutting edge performs the secondary cutting functions.
Further, the third-order cutting edge corresponds to a plurality of point angles, the point angle corresponding to the cutting edge near the point is a first point angle, the second point angle is a third point angle in sequence, and the point angle is reduced in size. By this arrangement, the present invention can have a shorter chisel edge and reduce axial forces.
Further, the drill bit is provided with the prismatic belt, and the prismatic belt is arranged along the tail end from the drill point to the cutting edge, so that friction with the hole wall can be reduced, chip capacity is improved, and chip flutes 11 are formed.
Further, the number of the cutting edges is 3, and in the projection of the drill point, the cutting edge closest to the drill point accounts for 2/3 of the total length of the cutting edges, and the length of the cutting edges is reduced and then increased.
Further, the point angles are sequentially reduced from the point, the point angle of the part close to the point is a first-order point angle, the first-order point angle is 110-130 degrees, each-order descending gradient is 20-60 degrees, and the third-order point angle is provided. In this embodiment, three-step cutting edges, i.e., a first cutting edge 4, a second cutting edge 6, and a third cutting edge 8, are formed, and the corresponding point angles are α, β, and θ, respectively, and are 120 °, 80 °, and 20 °, respectively.
Furthermore, the longitudinal projection of the drill chisel edge on the drill point accounts for 1/3 of the drill diameter, and the drill point has smaller chisel edge length, so that the extrusion time of the drill point is reduced when the drill point enters the drill, and the axial force is reduced.
Further, the cutting edges are symmetrical with respect to the apex of the drill tip such that the stress of each cutting edge of the drill tip is balanced so as not to cause damage to the drill bit.
Further, the PCB micro drill further comprises a drill shank 14.
The working principle of the invention is as follows:
① The multi-point angle structure design is adopted, the working front angles of the multi-section cutting edges are different, the effective removal amount of cutting can be improved, and the hole wall roughness is reduced.
② The main rear cutters are arranged in a hierarchical mode, chip removal is facilitated, adhesion is reduced, chips generated by cutting edges near the drill point flow away from the main rear cutters to the second-stage main rear cutters, and chip removal is achieved, so that chip removal capacity is improved;
③ The main rear tool face corresponding to the cutting edge farthest from the drill point is connected with the drill body edge belt, so that the chip capacity of the drilling cuttings groove is increased.
Compared with the prior art, the invention has the beneficial technical effects that:
the processing micro drill bit is provided with a plurality of sharp corners, and the printed circuit board can reduce the roughness of the hole wall and the generation of glue slag under the cutting action of a plurality of sections of cutting edges. The drill bit has smaller chisel edge, is beneficial to reducing drilling force, has a prismatic belt, increases the size of a chip removing groove, improves chip containing capacity, is beneficial to chip removing, reduces surface friction, reduces friction with a processed material and the surface of the drill bit, reduces the generation of cutting heat, and improves the service life of the drill bit.
Example 3
A PCB micro drill bit is characterized by comprising four-step cutting edges and four first main rear cutter surfaces, wherein the main rear cutter surfaces and the cutting edges are corresponding and equal in number, and the included angle between the main rear cutter surfaces and the central axis of the drill bit is gradually reduced from the position close to the drill point to the position far from the drill point;
The tool comprises a chisel edge and a rear tool face corresponding to the cutting edge, wherein the first cutting edge to the fourth cutting edge are arranged near the drill tip, and the corresponding first rear tool face to the fourth rear tool face respectively correspond to the cutting edge along the chip groove of the spiral of the drill body.
Further, the last pair of the cutting edges and the auxiliary cutting edges furthest from the drill center intersect at a point, the main rear tool face furthest from the drill tip and the edge band intersect at one side, the front tool faces corresponding to the multi-step cutting edges are positioned on the same face, and the length of the cutting edges is reduced and increased from the drill tip. In the present invention, the first cutting edge takes on more cutting functions, and the last cutting edge takes on the secondary cutting functions.
Further, the multiple cutting edges correspond to multiple point angles, the point angle corresponding to the cutting edge close to the point is a first point angle, the point angles are sequentially from a second point angle to a fourth point angle, and the point angle is sequentially reduced. By this arrangement, the present invention can have a shorter chisel edge and reduce axial forces.
Further, the drill bit is provided with the prismatic belt, and the prismatic belt is arranged along the tail end from the drill point to the cutting edge, so that friction with the hole wall can be reduced, and chip capacity is improved.
Further, the number of the cutting edges is 4, and in the projection of the drill point, the cutting edge closest to the drill point accounts for 2/3 of the total length of the cutting edges, and the length of the cutting edges is reduced and then increased.
Further, the point angles are sequentially reduced from the point, the point angle of the part close to the point is a first-order point angle, the first-order point angle is 110-130 degrees, each-order descending gradient is 20-60 degrees, and the four-order point angle is provided. In this embodiment, the fourth-order cutting edges, i.e., the first cutting edge, the second cutting edge, the third cutting edge, and the fourth cutting edge, are formed, and the corresponding point angles are α, β, θ, and γ, respectively, which are 120 °, 80 °, 60 °, and 20 °.
Furthermore, the longitudinal projection of the drill chisel edge on the drill point accounts for 1/3 of the drill diameter, and the drill point has smaller chisel edge length, so that the extrusion time of the drill point is reduced when the drill point enters the drill, and the axial force is reduced.
Further, the cutting edges are symmetrical with respect to the apex of the drill tip such that the stress of each cutting edge of the drill tip is balanced so as not to cause damage to the drill bit.
Example 4
A PCB micro drill bit is characterized by comprising five-step cutting edges and five first main rear cutter surfaces, wherein the main rear cutter surfaces and the cutting edges are corresponding and equal in number, and the included angle between the main rear cutter surfaces and the central axis of the drill bit is gradually reduced from the position close to the drill point to the position far from the drill point;
the tool comprises a chisel edge and a rear tool face corresponding to the cutting edge, wherein the first cutting edge to the fifth cutting edge are arranged near the drill tip, and the corresponding first rear tool face to the fifth rear tool face respectively correspond to the cutting edge along the chip removal groove of the spiral of the drill body.
Further, the last pair of the cutting edges and the auxiliary cutting edges furthest from the drill center intersect at a point, the main rear tool face furthest from the drill tip and the edge band intersect at one side, the front tool faces corresponding to the multi-step cutting edges are positioned on the same face, and the length of the cutting edges is reduced and increased from the drill tip. In the present invention, the first cutting edge takes on more cutting functions, and the last cutting edge takes on the secondary cutting functions.
Further, the multiple cutting edges correspond to multiple point angles, the point angle corresponding to the cutting edge close to the point is a first point angle, the point angles are sequentially from a second point angle to a fifth point angle, and the point angle is sequentially reduced. By this arrangement, the present invention can have a shorter chisel edge and reduce axial forces.
Further, the drill bit is provided with the prismatic belt, and the prismatic belt is arranged along the tail end from the drill point to the cutting edge, so that friction with the hole wall can be reduced, and chip capacity is improved.
Further, the number of the cutting edges is 5, and in the projection of the drill point, the cutting edge closest to the drill point accounts for 2/3 of the total length of the cutting edges, and the length of the cutting edges is reduced and then increased.
Further, the point angles decrease in order from the point, the point angle near the point is a first-order point angle, the first-order point angle is 110 ° to 130 °, each step down gradient is 20 ° to 60 °, and the point angle has five steps. In this embodiment, the fifth-order cutting edges are respectively a first cutting edge, a second cutting edge, a third cutting edge, a fourth cutting edge and a fifth cutting edge, and the corresponding point angles are respectively α, β, θ, γ and δ, and are respectively 120 °, 100 °, 80 °, 40 ° and 20 °.
Furthermore, the longitudinal projection of the drill chisel edge on the drill point accounts for 1/3 of the drill diameter, and the drill point has smaller chisel edge length, so that the extrusion time of the drill point is reduced when the drill point enters the drill, and the axial force is reduced.
Further, the cutting edges are symmetrical with respect to the apex of the drill tip such that the stress of each cutting edge of the drill tip is balanced so as not to cause damage to the drill bit.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art. It should be noted that technical features not described in detail in the present invention may be implemented by any prior art.
Claims (2)
1. The PCB micro drill bit is characterized by comprising a third-order cutting edge and three main rear cutter surfaces, wherein the three main rear cutter surfaces are a first rear cutter surface, a second rear cutter surface and a third rear cutter surface respectively; the single main rear cutter faces and the cutting edges are corresponding and equal in number, and the included angle between the main rear cutter faces and the central axis of the drill bit is gradually reduced from the position close to the drill tip to the position far away from the drill tip;
The tool comprises a chisel edge and a rear tool face corresponding to the cutting edge, wherein a first cutting edge, a second cutting edge and a third cutting edge are sequentially arranged near a drill point, and the corresponding first rear tool face, second rear tool face and third rear tool face respectively correspond to the cutting edges along a chip groove of a drill body spiral;
the last pair of third cutting edges and the auxiliary cutting edges which are farthest from the drill center intersect at a point, the main rear tool face and the edge belt which are farthest from the drill point intersect at one side, the front tool faces corresponding to the third-order cutting edges are positioned on the same face, and the lengths of the cutting edges are sequentially reduced and increased from the drill point;
The third-order cutting edge corresponds to three point angles, the point angle corresponding to the cutting edge near the point is a first point angle, the second point angle is a third point angle in turn, and the point angle is reduced in size in turn;
the drill bit is provided with a prismatic belt, and the prismatic belt is arranged along the tail end from the drill point to the cutting edge;
The number of the cutting edges is 3, each cutting edge is arranged in the projection of the drill point,
The length of the first cutting edge accounts for 2/3 of the length of the total cutting edge, and the lengths of the first cutting edge, the second cutting edge and the third cutting edge are firstly reduced and then increased;
The point angles are reduced in sequence from the point, the point angle close to the point is a first-order point angle, and the point angle is a third-order point angle; the third-order cutting edges are respectively a first cutting edge, a second cutting edge and a third cutting edge, and the corresponding point angles are respectively alpha, beta and theta, and are respectively 120 DEG, 80 DEG and 20 DEG;
the chisel edge of the drill bit is projected in the longitudinal direction of the drill point to occupy 1/3 of the drill diameter.
2. The PCB micro drill of claim 1, wherein the cutting edge is symmetrical with respect to the apex of the drill tip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711473072.8A CN108057918B (en) | 2017-12-29 | 2017-12-29 | PCB miniature drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711473072.8A CN108057918B (en) | 2017-12-29 | 2017-12-29 | PCB miniature drill bit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108057918A CN108057918A (en) | 2018-05-22 |
| CN108057918B true CN108057918B (en) | 2024-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711473072.8A Active CN108057918B (en) | 2017-12-29 | 2017-12-29 | PCB miniature drill bit |
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| CN (1) | CN108057918B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115673387A (en) * | 2022-10-17 | 2023-02-03 | 嘉兴沃尔德金刚石工具有限公司 | Micro drill bit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1843654A (en) * | 2005-04-10 | 2006-10-11 | 江苏飞达工具集团股份有限公司 | Method for improving service life of rolled spiral drill |
| CN102026754A (en) * | 2008-05-15 | 2011-04-20 | 住友电工硬质合金株式会社 | Twist drill bit |
| JP3186747U (en) * | 2013-07-15 | 2013-10-24 | 創國興業有限公司 | Drill structure |
| CN207787797U (en) * | 2017-12-29 | 2018-08-31 | 广东工业大学 | A kind of PCB microbits |
-
2017
- 2017-12-29 CN CN201711473072.8A patent/CN108057918B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1843654A (en) * | 2005-04-10 | 2006-10-11 | 江苏飞达工具集团股份有限公司 | Method for improving service life of rolled spiral drill |
| CN102026754A (en) * | 2008-05-15 | 2011-04-20 | 住友电工硬质合金株式会社 | Twist drill bit |
| JP3186747U (en) * | 2013-07-15 | 2013-10-24 | 創國興業有限公司 | Drill structure |
| CN207787797U (en) * | 2017-12-29 | 2018-08-31 | 广东工业大学 | A kind of PCB microbits |
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|---|---|
| CN108057918A (en) | 2018-05-22 |
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