A ball drill bit for precision drilling

Abstract

The present application relates to the field of drill bits, and in particular to a ball drill bit for precision drilling. The technical solution is as follows: a cutter body and a cutter head disposed at one end of the cutter body and coaxial with the cutter body; the cutter head includes a grinding portion disposed at one end of the cutter body, a ball head processing portion disposed at the upper end of the grinding portion, and a drilling portion disposed at the upper end of the ball head processing portion; the drilling portion includes a first cutting edge and a second cutting edge disposed obliquely at the upper end of the ball head processing portion; the ball head processing portion includes a first ball head cutting edge spirally disposed at the lower end of the first cutting edge and a second ball head cutting edge spirally disposed at the lower end of the second cutting edge. The present application facilitates milling of mounting holes and improves drilling efficiency and drilling quality.

Description

Technical Field

[0001] The present application relates to the field of drill bits, and in particular to a ball drill bit for precision drilling. Background Art

[0002] The roller press is used to crush the material, which effectively speeds up the processing efficiency of the material. There is a roller press including a roller, and a plurality of protrusions are installed on the surface of the roller. The protrusions on the roller can be removed and replaced. Figure 1 The existing bump 15 is cylindrical and the lower end of the arc shape is hemispherical. The mounting end of the bump 15 is spherical, which can reduce the pressure applied by the bump 15 to the roller and facilitate the release of the pressure on the bump 15. In order to improve the stability of the bump 15 on the roller, when drilling a hole on the roller surface, the processing personnel need to first use a drill bit to drill a cylindrical mounting hole 16, and then use a ball-end milling cutter to mill the mounting hole 16, and process the inside of the mounting hole 16 into a hemispherical shape. Since the width of the ball-end milling cutter cannot be larger than the diameter of the mounting hole 16, a ball-end milling cutter is required for mobile milling. During mobile milling, the hemispherical hole processed by the ball-end milling cutter has a poor fit with the bump 15, resulting in low installation stability of the bump 15. Summary of the Invention

[0003] In order to facilitate the milling of mounting holes and improve drilling efficiency and drilling quality, the present application provides a ball drill bit for precision drilling.

[0004] This application provides a ball drill bit for precision drilling, which adopts the following technical solution:

[0005] A ball drill bit for precision drilling comprises a cutter body and a cutter head arranged at one end of the cutter body and coaxial with the cutter body, the cutter head comprising a grinding processing portion arranged at one end of the cutter body, a ball head processing portion arranged at the upper end of the grinding processing portion, and a drilling portion arranged at the upper end of the ball head processing portion, the drilling portion comprising a first cutting edge and a second cutting edge arranged obliquely at the upper end of the ball head processing portion, the ball head processing portion comprising a first ball head cutting edge spirally arranged at the lower end of the first cutting edge and a second ball head cutting edge spirally arranged at the lower end of the second cutting edge.

[0006] By adopting the above technical solution, the cutter body is used to install the cutter head to improve the stability of the cutter head, the drilling part is used to drill holes to speed up the drilling efficiency of the cutter head, the ball head processing part is used to process the spherical part of the mounting hole, so as to improve the stability of the bump installation, the grinding processing part is used to mill the cylindrical part of the mounting hole to improve the smoothness of the inner wall of the mounting hole, the first cutting edge and the second cutting edge are used to break the surface of the roller to reduce the milling pressure of the ball head cutting edge one and the ball head cutting edge two, the ball head cutting edge one and the ball head cutting edge two are used to process the hemispherical hole at the bottom of the mounting hole to improve the fit of the bump installation.

[0007] Preferably, the spiral direction of the first ball-end cutting edge is consistent with the spiral direction of the second ball-end cutting edge, the first ball-end cutting edge is in an arc shape, and the second ball-end cutting edge is in an arc shape.

[0008] By adopting the above technical solution, the ball head cutting edge 1 is spirally set, which facilitates the milling processing of the ball head cutting edge 1 and facilitates the discharge of chips milled by the ball head cutting edge 1. The ball head cutting edge 1 is arc-shaped, which facilitates milling the bottom of the mounting hole into a hemispherical shape; the spiral direction of the ball head cutting edge 2 is consistent with the spiral direction of the ball head cutting edge 1, which facilitates improving the milling efficiency of the ball head processing part and improving the smoothness of the hemispherical inner wall of the mounting hole.

[0009] Preferably, the first cutting edge and the second cutting edge are symmetrically arranged with the rotation axis of the cutter body as the symmetry axis, and the first cutting edge and the second cutting edge are conical.

[0010] By adopting the above technical solution, the first cutting edge and the second cutting edge are symmetrically arranged, which is convenient for balancing the punching pressure and balancing the pressure on the cutter head during milling processing. The first cutting edge and the second cutting edge are tapered to facilitate milling processing and reduce milling pressure.

[0011] Preferably, the drilling portion is provided with an auxiliary cutting edge 1 and an auxiliary cutting edge 2, and the auxiliary cutting edge 1 and the auxiliary cutting edge 2 are symmetrically arranged with the connecting line between the first cutting edge and the second cutting edge as the axis of symmetry.

[0012] By adopting the above technical solution, the auxiliary cutting edge 1 and the auxiliary cutting edge 2 reduce the drilling pressure of the drilling part, while improving the precision of the drilling part processing, which facilitates improving the smoothness of the inner wall of the mounting hole.

[0013] Preferably, a buffer edge 1 is spirally provided at the lower end of the auxiliary cutting edge and is located between the ball-end cutting edge 1 and the ball-end cutting edge 2, and a chip groove 1 is spirally provided between the buffer edge 1 and the ball-end cutting edge 1, and a buffer edge 2 is spirally provided at the lower end of the auxiliary cutting edge 2 and is located between the ball-end cutting edge 1 and the ball-end cutting edge 2, and a chip groove 2 is spirally provided between the buffer edge 2 and the ball-end cutting edge 2.

[0014] By adopting the above technical solution, buffer edge one accelerates the milling efficiency of ball-end cutting edge one and ball-end cutting edge two, and at the same time improves the milling fineness of ball-end cutting edge one and ball-end cutting edge two, and chip groove one facilitates the discharge of chips generated by buffer edge one; buffer edge two accelerates the milling efficiency of ball-end cutting edge two and ball-end cutting edge one, and chip groove two facilitates the discharge of chips generated by buffer edge two.

[0015] Preferably, a secondary cutting edge 1 is further provided at one end where the auxiliary cutting edge 1 is connected to the buffer edge 1, and a chip groove 3 is provided between the buffer edge 1 and the secondary cutting edge 1.

[0016] By adopting the above technical solution, the auxiliary cutting edge 1 improves the milling quality of the buffer edge 1, and the chip groove 3 facilitates the discharge of debris generated between the buffer edge 1 and the auxiliary cutting edge 1.

[0017] Preferably, a chip removal groove four is provided between the secondary cutting edge one and the ball-end cutting edge two.

[0018] By adopting the above technical solution, the chip groove four facilitates the discharge of debris generated between the auxiliary cutting edge one and the ball-end cutting edge two, thereby reducing the possibility of debris interfering with the milling of the ball-end cutting edge two.

[0019] Preferably, a secondary cutting edge 2 is provided at one end where the auxiliary cutting edge 2 is connected to the buffer edge 2, and a chip groove 5 is provided between the secondary cutting edge 2 and the buffer edge 2.

[0020] By adopting the above technical solution, the secondary cutting edge 2 improves the milling efficiency of the buffer edge 2 and improves the smoothness of the inner wall of the mounting hole. The chip groove 5 facilitates the discharge of debris between the secondary cutting edge 2 and the buffer edge 2, reducing the possibility of debris interfering with the milling process of the secondary cutting edge 2.

[0021] Preferably, a chip removal groove six is ​​provided between the secondary cutting edge two and the ball-end cutting edge one.

[0022] By adopting the above technical solution, the chip groove six is ​​used to discharge the chips generated between the secondary cutting edge two and the ball-end cutting edge one.

[0023] Preferably, the grinding processing portion includes a grinding cutting edge 1 spirally arranged below the ball head cutting edge 1 and a grinding cutting edge 2 spirally arranged below the ball head cutting edge 2.

[0024] By adopting the above technical solution, the grinding cutting edge pair is used to mill the inner wall of the mounting hole, thereby improving the smoothness of the inner wall of the mounting hole and facilitating the installation of the bump; the grinding cutting edge 2 is used in conjunction with the grinding cutting edge pair to mill the mounting hole, thereby improving the milling efficiency of the mounting hole.

[0025] To sum up, the drilling part, ball head processing part and grinding processing part effectively reduce the number of tool changes during milling, making it easier to mill the mounting hole in one go. At the same time, the ball head processing part can directly mill the spherical part of the mounting hole, thereby improving the fit between the bump and the mounting hole and improving the stability of the bump installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the bump and mounting hole of the present application;

[0027] Figure 2 This is a schematic structural diagram of a ball drill bit for precision drilling in the present application;

[0028] Figure 3This is a top view of a ball drill bit for precision drilling in the present application.

[0029] Explanation of the accompanying symbols: 1. Cutter body; 2. Cutter head; 21. Grinding processing part; 211. Grinding cutting edge one; 212. Grinding cutting edge two; 22. Ball head processing part; 221. Ball head cutting edge one; 222. Ball head cutting edge two; 23. Drilling part; 231. First cutting edge; 232. Second cutting edge; 3. Auxiliary cutting edge one; 4. Auxiliary cutting edge two; 5. Buffer edge one; 6. Chip groove one; 7. Buffer edge two; 8. Chip groove two; 9. Auxiliary cutting edge one; 10. Chip groove three; 11. Chip groove four; 12. Auxiliary cutting edge two; 13. Chip groove five; 14. Chip groove six; 15. Bump; 16. Mounting hole. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-3 This application is described in further detail.

[0031] Reference Figure 1 , a schematic diagram of the structure of the protrusion 15, the upper end of the protrusion 15 is cylindrical, the lower end of the protrusion 15 is hemispherical, and the surface of the roller is provided with a mounting hole 16 for mounting the protrusion 15. In order to facilitate milling processing of the mounting hole 16, the fit between the mounting hole 16 and the protrusion 15 is improved.

[0032] The embodiment of the present application discloses a ball drill bit for precision drilling. Figure 2 and Figure 3 , comprising a cutter body 1 and a cutter head 2 fixed to one end of the cutter body 1. The cutter head 2 is arranged coaxially with the cutter body 1, so that the cutter body 1 can drive the cutter head 2 to perform milling processing. In the present application, the cutter body 1 and the cutter head 2 are integrally formed to improve the stability of the cutter head 2 on the cutter body 1. In order to facilitate the processing of the mounting hole 16, the cutter head 2 includes a drilling portion 23, a ball head processing portion 22 and a grinding processing portion 21, which are arranged on the cutter body 1 in sequence from top to bottom. The drilling portion 23 is used to break the surface of the roller and relieve the pressure of the ball head processing portion 22.

[0033] Reference Figure 2 and Figure 3The drilling portion 23 includes a first cutting edge 231 and a second cutting edge 232 that are obliquely arranged at the upper end of the ball head processing portion 22. The inclination direction of the first cutting edge 231 is opposite to the inclination direction of the second cutting edge 232. The first cutting edge 231 and the second cutting edge 232 are symmetrically arranged with the rotation axis of the cutter body 1 as the symmetry axis. The first cutting edge 231 and the second cutting edge 232 are arranged in a conical shape to facilitate breaking the surface of the roller. In the embodiment of the present application, the angle between the first cutting edge 231 and the second cutting edge 232 is 140°. This angle can effectively ensure that the contact surface between the bump 15 and the mounting hole 16 is more than 70%, while ensuring milling efficiency. In order to ensure the fit of the bump 15, existing processing personnel can increase the angle between the first cutting edge 231 and the second cutting edge 232, and the angle adjustment range is between 140° and 180°.

[0034] Reference Figure 2 and Figure 3 To improve the milling efficiency of the drilling portion 23, the drilling portion 23 is further provided with an auxiliary cutting edge 1 3 and an auxiliary cutting edge 2 4 located between the first cutting edge 231 and the second cutting edge 232. The auxiliary cutting edge 1 3 and the auxiliary cutting edge 2 4 are symmetrically arranged about the connecting line of the first cutting edge 231 and the second cutting edge 232 in a top view. The first cutting edge 231 and the second cutting edge 232 improve the milling efficiency of the first cutting edge 231 and the second cutting edge 232, while also enhancing the milling effect of the first cutting edge 231 and the second cutting edge 232, thereby ensuring the smoothness of the inner wall of the mounting hole 16.

[0035] Reference Figure 2 and Figure 3 The ball end processing portion 22 includes a ball end cutting edge 1 221 spirally arranged at the lower end of the first cutting edge 231 and a ball end cutting edge 222 spirally arranged at the lower end of the second cutting edge 232. The ball end cutting edge 1 221 is in an arc shape and the arc fits the spherical part of the mounting hole 16. The ball end cutting edge 222 is also in an arc shape, which facilitates milling of the mounting hole 16. The ball end cutting edge 1 221 and the ball end cutting edge 2 222 are spirally arranged to reduce milling pressure and guide the discharge of debris generated by milling. A buffer edge 1 5 is spirally arranged downward at the lower end of the auxiliary cutting edge 1 3. The buffer edge 1 5 is located between the ball end cutting edge 1 221 and the ball end cutting edge 2 222. At the same time, the spiral direction of the buffer edge 1 5 is consistent with the spiral direction of the ball end cutting edge 1 221 and the ball end cutting edge 2 222, which facilitates relieving the milling pressure of the ball end cutting edge 1 221 and the ball end cutting edge 2 222.

[0036] Reference Figure 2 and Figure 3A chip groove 6 is defined between the buffer edge 5 and the ball-end cutting edge 221. This groove 6 extends along the spiral direction of the two, facilitating the timely removal of chips generated during milling between the two. A secondary cutting edge 9 extends downward from the end where the auxiliary cutting edge 3 and the buffer edge 5 connect. A chip groove 3 10 is defined between the two, facilitating the timely removal of chips between the two. A chip groove 4 11 is also defined between the secondary cutting edge 9 and the ball-end cutting edge 222, primarily used to remove chips generated between the two.

[0037] Reference Figure 2 and Figure 3 A buffer edge 27 is spirally provided downwardly at the lower end of the auxiliary cutting edge 24. The buffer edge 27 is located between the ball-end cutting edge 1 221 and the ball-end cutting edge 2 222. The buffer edge 27 improves the milling efficiency of the auxiliary cutting edge 24. A chip groove 28 is spirally provided between the buffer edge 27 and the ball-end cutting edge 2 222. The chip groove 28 facilitates the timely discharge of debris between the buffer edge 27 and the ball-end cutting edge 2 222. A secondary cutting edge 2 12 extends downwardly from the end where the auxiliary cutting edge 2 4 is connected to the buffer edge 2 7. A chip groove 5 13 is provided between the secondary cutting edge 2 12 and the buffer edge 2 7. The chip groove 5 13 facilitates the discharge of debris between the secondary cutting edge 2 12 and the buffer edge 2 7. A chip groove 6 14 is also provided between the secondary cutting edge 2 12 and the ball-end cutting edge 1 221. The chip groove 6 14 facilitates the discharge of debris between the secondary cutting edge 2 12 and the ball-end cutting edge 1 221.

[0038] Reference Figure 2 and Figure 3 After the ball end processing unit 22 is milled, the grinding unit 21 grinds the cylindrical inner wall of the mounting hole 16 to improve the smoothness of the inner wall of the mounting hole 16. The grinding unit 21 includes a grinding cutting edge 1 211 spirally arranged at the lower end of the ball end cutting edge 1 221 and a grinding cutting edge 2 212 spirally arranged below the ball end cutting edge 2 222. The buffer edge 1 5 and the buffer edge 2 7 spirally extend into the processing range of the grinding cutting edge 1 211 and the grinding cutting edge 2 212 to improve the grinding accuracy of the grinding cutting edge 1 211 and the grinding cutting edge 2 212.

[0039] The operating principle of the precision drilling ball drill bit of the present embodiment is as follows: the drilling portion 23 first breaks the roller surface, facilitating subsequent milling by the ball head processing portion 22 and reducing the milling pressure of the ball head processing portion 22. During the milling process, the ball head processing portion 22 completes the milling of the mounting hole 16, and the grinding portion 21 finely grinds the inner wall of the mounting hole 16 to improve the smoothness of the inner wall of the mounting hole 16.

[0040] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A ball drill bit for precision drilling, characterized by: The invention comprises a cutter body (1) and a cutter head (2) arranged at one end of the cutter body (1) and coaxial with the cutter body (1); the cutter head (2) comprises a grinding processing portion (21) arranged at one end of the cutter body (1), a ball head processing portion (22) arranged at the upper end of the grinding processing portion (21), and a drilling portion (23) arranged at the upper end of the ball head processing portion (22); the drilling portion (23) comprises a first cutting edge (231) and a second cutting edge (232) arranged obliquely at the upper end of the ball head processing portion (22); the ball head processing portion (22) comprises a first ball head cutting edge (221) spirally arranged at the lower end of the first cutting edge (231) and a second ball head cutting edge (222) spirally arranged at the lower end of the second cutting edge (232); The first cutting edge (231) and the second cutting edge (232) are symmetrically arranged with the rotation axis of the cutter body (1) as a symmetry axis, and the first cutting edge (231) and the second cutting edge (232) are conical; The drilling portion (23) is provided with an auxiliary cutting edge 1 (3) and an auxiliary cutting edge 2 (4), and the auxiliary cutting edge 1 (3) and the auxiliary cutting edge 2 (4) are symmetrically arranged with the connecting line of the first cutting edge (231) and the second cutting edge (232) as the symmetry axis; The lower end of the auxiliary cutting edge 1 (3) is spirally provided with a buffer edge 1 (5) located between the ball-end cutting edge 1 (221) and the ball-end cutting edge 2 (222), and a chip groove 1 (6) is spirally provided between the buffer edge 1 (5) and the ball-end cutting edge 1 (221). The lower end of the auxiliary cutting edge 2 (4) is spirally provided with a buffer edge 2 (7) located between the ball-end cutting edge 1 (221) and the ball-end cutting edge 2 (222), and a chip groove 2 (8) is spirally provided between the buffer edge 2 (7) and the ball-end cutting edge 2 (222). The end where the auxiliary cutting edge 1 (3) is connected to the buffer edge 1 (5) is also provided with a secondary cutting edge 1 (9), and a chip removal groove 3 (10) is provided between the buffer edge 1 (5) and the secondary cutting edge 1 (9); a chip removal groove 4 (11) is provided between the secondary cutting edge 1 (9) and the ball-end cutting edge 2 (222); A second auxiliary cutting edge (12) is provided at one end where the second auxiliary cutting edge (4) is connected to the second buffer edge (7), and a fifth chip removal groove (13) is provided between the second auxiliary cutting edge (12) and the second buffer edge (7); and a sixth chip removal groove (14) is provided between the second auxiliary cutting edge (12) and the first ball-end cutting edge (221).

2. A ball drill bit for precision drilling according to claim 1, characterized in that: The spiral direction of the ball-end cutting edge 1 (221) is consistent with the spiral direction of the ball-end cutting edge 2 (222); the ball-end cutting edge 1 (221) is in an arc shape; and the ball-end cutting edge 2 (222) is in an arc shape.

3. A ball drill bit for precision drilling according to claim 1, characterized in that: The grinding processing part (21) includes a grinding cutting edge 1 (211) spirally arranged below a ball head cutting edge 1 (221) and a grinding cutting edge 2 (212) spirally arranged below a ball head cutting edge 2 (222).

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