Drilling tool with multi-purpose chamfering insert

Abstract

The invention discloses a drilling tool with a multi-purpose chamfering blade, comprising a tool body, a drill bit and a chamfering blade, the drill bit being mounted on the front end of the tool body, a chamfering blade mounting groove being provided on the outer peripheral surface of the middle portion of the tool body, the chamfering blade being mounted in the chamfering blade mounting groove through a locking member, the chamfering blade comprising an upper base surface, a lower base surface and a plurality of side surfaces located between the upper base surface and the lower base surface, a first chamfering cutting edge being provided at a junction of the upper base surface and one of the side surfaces, a second chamfering cutting edge being provided at a junction of the lower base surface and the other side surface, when the upper base surface is in contact with and positioned on a positioning bottom surface of the chamfering blade mounting groove, an angle A is provided between the second chamfering cutting edge and a rotation center axis of the drilling tool, and when the lower base surface is in contact with and positioned on a positioning bottom surface of the chamfering blade mounting groove, an angle B is provided between the first chamfering cutting edge and a rotation center axis of the drilling tool, which should satisfy: A≠B. The invention has the advantages of stable and reliable structure, ability to realize chamfering at least two angles and simple operation.

Description

Technical Field

[0001] The invention mainly relates to the field of metal cutting, and in particular to a drilling tool with a multi-purpose chamfering blade. Background Art

[0002] Drilling and chamfering compound tools can complete drilling and hole chamfering at one time, and are very common in mechanical processing. However, in the prior art, the blade edge parameters of the chamfering tool cannot be adjusted, resulting in low versatility of the blade and high processing costs.

[0003] Chinese patent document CN211218847U discloses a cemented carbide drilling and chamfering combination tool, which includes a tool body, a drilling blade, a chamfering blade and a tool handle arranged at the end of the tool body, which can realize integrated processing of drilling and chamfering on both sides. However, since the chamfering blade is a machine-clamped blade, the chamfering angle of the hole is fixed and the versatility is insufficient. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a drilling tool with a multi-purpose chamfering blade which has a stable and reliable structure, can achieve chamfering at least two angles and is easy to operate.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A drilling tool with a multi-purpose chamfering blade comprises a tool body, a drill bit and a chamfering blade, the drill bit being mounted on the front end of the tool body, a chamfering blade mounting groove being opened on the outer peripheral surface of the middle portion of the tool body, the chamfering blade being mounted in the chamfering blade mounting groove through a locking piece, the chamfering blade comprising an upper base surface, a lower base surface and a plurality of side surfaces located between the upper base surface and the lower base surface, a first chamfering cutting edge being provided at the junction of the upper base surface and one of the side surfaces, a second chamfering cutting edge being provided at the junction of the lower base surface and the other side surface, when the upper base surface is in contact with and positioned at a locating bottom surface of the chamfering blade mounting groove, an angle between the second chamfering cutting edge and a rotation center axis of the drilling tool is A, and when the lower base surface is in contact with and positioned at a locating bottom surface of the chamfering blade mounting groove, an angle between the first chamfering cutting edge and a rotation center axis of the drilling tool is B, which should satisfy: A≠B.

[0007] As a further improvement of the above technical solution:

[0008] The multiple side surfaces of the chamfered blade are a first blade positioning side surface, a second blade positioning side surface, a third blade positioning side surface, a fourth side surface and a fifth side surface which are arranged in sequence, the first chamfered cutting edge is located at the junction of the fifth side surface and the upper base surface, and the second chamfered cutting edge is located at the junction of the fourth side surface and the lower base surface, the chamfered blade mounting groove also includes a first side positioning surface, a second side positioning surface and a third side positioning surface which are arranged in sequence, when the upper base surface is in contact and positioned with the positioning bottom surface of the chamfered blade mounting groove, the third blade positioning side surface is in contact and cooperation with the first side positioning surface, the second blade positioning side surface is in contact and cooperation with the second side positioning surface, and the first blade positioning side surface is in contact and cooperation with the third side positioning surface, and when the lower base surface is in contact and positioned with the positioning bottom surface of the chamfered blade mounting groove, the first blade positioning side surface is in contact and cooperation with the first side positioning surface, the second blade positioning side surface is in contact and cooperation with the second side positioning surface, and the third blade positioning side surface is in contact and cooperation with the third side positioning surface.

[0009] The angles between the first side positioning surface and the second side positioning surface, and between the first blade positioning side surface and the second blade positioning side surface are both C, and the angles between the second side positioning surface and the third side positioning surface, and between the second blade positioning side surface and the third blade positioning side surface are both D, which should satisfy: C=D.

[0010] The lengths of the first blade positioning side surface and the third blade positioning side surface are L1 and L2 respectively, and should satisfy: L1=L2.

[0011] The upper base surface is provided with a chip breaker groove corresponding to the first chamfered cutting edge, and the lower base surface is provided with a chip breaker groove corresponding to the second chamfered cutting edge.

[0012] The locking piece is a locking screw, a threaded hole is provided on the positioning bottom surface of the chamfering blade mounting groove, a blade screw hole passing through the upper base surface and the lower base surface is provided on the chamfering blade, and the locking screw passes through the blade screw hole and is connected to the threaded hole.

[0013] 30°≤A≤60°, 45°≤B≤75°.

[0014] 105°≤C≤165°, 105°≤D≤165°.

[0015] Compared with the prior art, the advantages of the present invention are:

[0016] The drilling tool with a multi-purpose chamfering blade of the present invention comprises an upper base surface, a lower base surface and multiple side surfaces located between the upper base surface and the lower base surface, a first chamfering cutting edge is provided at the junction of the upper base surface and one of the side surfaces, and a second chamfering cutting edge is provided at the junction of the lower base surface and the other side surface. When the upper base surface is in contact with the positioning bottom surface of the chamfering blade mounting groove, the angle between the second chamfering cutting edge and the rotation center axis of the drilling tool is A, and when the lower base surface is in contact with the positioning bottom surface of the chamfering blade mounting groove, the angle between the first chamfering cutting edge and the rotation center axis of the drilling tool is B, which should satisfy: A≠B, two different chamfering cutting edges are arranged on the same chamfering blade, and two different chamfering units are realized by cooperating with different base surfaces and side surfaces with the chamfering blade mounting groove, that is, the two different chamfering units are realized by the same chamfering blade and the same chamfering blade mounting groove, that is, only by adjusting the installation method of the chamfering blade, the chamfering requirements of different angles can be achieved, thereby improving the processing efficiency and versatility of the drilling tool with the multi-purpose chamfering blade, and the structure is stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural diagram of a drilling tool with a multi-purpose chamfering blade according to the present invention.

[0018] Figure 2 It is a three-dimensional structural diagram of the chamfering blade of the drilling tool with a multi-purpose chamfering blade according to the present invention.

[0019] Figure 3 It is a front view of the chamfering blade of the drilling tool with a multi-purpose chamfering blade according to the present invention.

[0020] Figure 4 It is a front view of a drilling tool with a multi-purpose chamfering blade according to the present invention.

[0021] Figure 5 yes Figure 4 Enlarged view of point A in the middle.

[0022] Figure 6 It is a schematic diagram of the drilling tool with the multi-purpose chamfering blade of the present invention when chamfering at angle A.

[0023] Figure 7 It is a schematic diagram of the drilling tool with the multi-purpose chamfering blade of the present invention when chamfering at angle B.

[0024] The symbols in the figure represent:

[0025] 1. Cutter body; 2. Drill bit; 3. Chamfered blade; 30. Blade screw hole; 31. Upper base surface; 32. Lower base surface; 33. First blade positioning side; 34. Second blade positioning side; 35. Third blade positioning side; 36. Fourth side; 37. Fifth side; 38. First chamfered cutting edge; 39. Second chamfered cutting edge; 4. Chamfered blade mounting groove; 41. Positioning bottom surface; 42. First side positioning surface; 43. Second side positioning surface; 44. Third side positioning surface; 5. Locking piece; 6. Chip groove; 9. Rotating center axis. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Figures 1 to 7 An embodiment of a drilling tool with a multi-purpose chamfering blade of the present invention is shown. The drilling tool with a multi-purpose chamfering blade of the embodiment comprises a tool body 1, a drill bit 2 and a chamfering blade 3. The drill bit 2 is mounted on the front end of the tool body 1. A chamfering blade mounting groove 4 is provided on the outer peripheral surface of the middle part of the tool body 1. The chamfering blade 3 is mounted in the chamfering blade mounting groove 4 through a locking member 5. The chamfering blade 3 comprises an upper base surface 31, a lower base surface 32 and a plurality of side surfaces located between the upper base surface 31 and the lower base surface 32. A first chamfering cutting edge 38 is provided at the junction of the upper base surface 31 and one of the side surfaces. A second chamfering cutting edge 39 is provided at the junction of the lower base surface 32 and the other side surface. When the upper base surface 31 is in contact with the positioning bottom surface 41 of the chamfering blade mounting groove 4, the second chamfering cutting edge 39 is provided. The angle between the cutting edge 39 and the rotation center axis 9 of the drilling tool is A. When the lower base surface 32 is in contact with the positioning bottom surface 41 of the chamfering blade mounting groove 4, the angle between the first chamfering cutting edge 38 and the rotation center axis 9 of the drilling tool is B, which should satisfy: A≠B. Two different chamfering cutting edges are arranged on the same chamfering blade 3, and two different chamfering units are realized by cooperating with different base surfaces and side surfaces in the chamfering blade mounting groove 4, that is, the two different chamfering units are realized by the same chamfering blade 3 and the same chamfering blade mounting groove, that is, only by adjusting the installation method of the chamfering blade 3, the chamfering requirements of different angles can be achieved, thereby improving the processing efficiency and versatility of the drilling tool with a multi-purpose chamfering blade, and the structure is stable and reliable.

[0028] In this embodiment, the multiple side surfaces of the chamfering blade 3 are a first blade positioning side surface 33, a second blade positioning side surface 34, a third blade positioning side surface 35, a fourth side surface 36 and a fifth side surface 37 which are arranged in sequence, the first chamfering cutting edge 38 is located at the junction of the fifth side surface 37 and the upper base surface 31, the second chamfering cutting edge 39 is located at the junction of the fourth side surface 36 and the lower base surface 32, and the chamfering blade mounting groove 4 also includes a first side positioning surface 42, a second side positioning surface 43 and a third side positioning surface 44 which are arranged in sequence, and when the upper base surface 31 is in contact with the positioning bottom surface 41 of the chamfering blade mounting groove 4, the third blade positioning side surface 35 is located at the junction of the fourth side surface 36 and the lower base surface 32. The first side positioning surface 42, the second blade positioning side surface 34 and the second side positioning surface 43, and the first blade positioning side surface 33 and the third side positioning surface 44 are all in contact and cooperate. When the lower base surface 32 is in contact and positioned with the positioning bottom surface 41 of the chamfering blade mounting groove 4, the first blade positioning side surface 33 and the first side positioning surface 42, the second blade positioning side surface 34 and the second side positioning surface 43, and the third blade positioning side surface 35 and the third side positioning surface 44 are all in contact and cooperate. That is, when the chamfering angle needs to be changed, it is only necessary to flip the chamfering blade 3 and rotate the installation angle of the chamfering blade 3 in the chamfering blade mounting groove 4. The structure is stable and reliable, and the operation is convenient.

[0029] In this embodiment, the angles between the first side positioning surface 42 and the second side positioning surface 43, and between the first blade positioning side surface 33 and the second blade positioning side surface 34 are both C, and the angles between the second side positioning surface 43 and the third side positioning surface 44, and between the second blade positioning side surface 34 and the third blade positioning side surface 35 are both D, which should satisfy: C=D. The lengths of the first blade positioning side surface 33 and the third blade positioning side surface 35 are L1 and L2, respectively, which should satisfy: L1=L2. Setting C=D and L1=L2 further simplifies the structure of the chamfering blade 3, facilitates the installation and adjustment of the chamfering blade 3 when chamfering at different angles. At the same time, the matching positioning of the chamfering blade 3 and the chamfering blade mounting groove 4 is stable and reliable. In this embodiment, L1=L2=3mm.

[0030] In this embodiment, a chip breaker groove corresponding to the first chamfer cutting edge 38 is provided on the upper base surface 31, and a chip breaker groove corresponding to the second chamfer cutting edge 39 is provided on the lower base surface 32, so as to facilitate chip breaking and chip removal of the chamfer cutting edge.

[0031] In this embodiment, the locking member 5 is a locking screw, a threaded hole is provided on the positioning bottom surface 41 of the chamfering blade mounting groove 4, and a blade screw hole 30 is provided on the chamfering blade 3 that passes through the upper base surface 31 and the lower base surface 32, and the locking screw passes through the blade screw hole 30 and is connected to the threaded hole.

[0032] 30°≤A≤60°, 45°≤B≤75°. In this embodiment, A=30°, B=45°.

[0033] 105°≤C≤165°, 105°≤D≤165°. In this embodiment, C=D=135°.

[0034] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A drilling tool with a multi-purpose chamfering blade, comprising a tool body (1), a drill bit (2) and a chamfering blade (3), wherein the drill bit (2) is mounted at the front end of the tool body (1), a chip removal groove (6) is provided on the outer peripheral surface of the tool body (1), a chamfering blade mounting groove (4) is provided on the outer peripheral surface of the middle part of the tool body (1), and the chamfering blade (3) is mounted in the chamfering blade mounting groove (4) through a locking member (5), characterized in that: The chamfering blade (3) comprises an upper base surface (31), a lower base surface (32) and a plurality of side surfaces located between the upper base surface (31) and the lower base surface (32); a first chamfering cutting edge (38) is provided at the junction of the upper base surface (31) and one of the side surfaces; a second chamfering cutting edge (39) is provided at the junction of the lower base surface (32) and the other side surface; when the upper base surface (31) is in contact with and positioned at a positioning bottom surface (41) of the chamfering blade mounting groove (4), an angle A is formed between the second chamfering cutting edge (39) and a rotation center axis (9) of the drilling tool; when the lower base surface (32) is in contact with and positioned at a positioning bottom surface (41) of the chamfering blade mounting groove (4), an angle B is formed between the first chamfering cutting edge (38) and a rotation center axis (9) of the drilling tool, and the following relationship is satisfied: A≠B.

2. The drilling tool with a multi-purpose chamfering insert according to claim 1, characterized in that: The multiple side surfaces of the chamfering blade (3) are a first blade positioning side surface (33), a second blade positioning side surface (34), a third blade positioning side surface (35), a fourth side surface (36) and a fifth side surface (37) which are arranged in sequence; the first chamfering cutting edge (38) is located at the junction of the fifth side surface (37) and the upper base surface (31); the second chamfering cutting edge (39) is located at the junction of the fourth side surface (36) and the lower base surface (32); the chamfering blade mounting groove (4) also includes a first side positioning surface (42), a second side positioning surface (43) and a third side positioning surface (44) which are arranged in sequence; when the upper base surface (31) and the chamfering blade mounting groove (4) are connected, the chamfering blade mounting groove (4) is provided with a first side positioning surface (42), a second side positioning surface (43) and a third side positioning surface (44) which are arranged in sequence. When the positioning bottom surface (41) of the mounting groove (4) is in contact for positioning, the third blade positioning side surface (35) is in contact with the first side positioning surface (42), the second blade positioning side surface (34) is in contact with the second side positioning surface (43), and the first blade positioning side surface (33) is in contact with the third side positioning surface (44); when the lower base surface (32) is in contact with the positioning bottom surface (41) of the chamfered blade mounting groove (4), the first blade positioning side surface (33) is in contact with the first side positioning surface (42), the second blade positioning side surface (34) is in contact with the second side positioning surface (43), and the third blade positioning side surface (35) is in contact with the third side positioning surface (44).

3. The drilling tool with a multi-purpose chamfering insert according to claim 2, characterized in that: The included angles between the first side positioning surface (42) and the second side positioning surface (43), and between the first blade positioning side surface (33) and the second blade positioning side surface (34) are both C, and the included angles between the second side positioning surface (43) and the third side positioning surface (44), and between the second blade positioning side surface (34) and the third blade positioning side surface (35) are both D, which should satisfy: C=D.

4. The drilling tool with a multi-purpose chamfering insert according to claim 2 or 3, characterized in that: The lengths of the first blade positioning side surface (33) and the third blade positioning side surface (35) are L1 and L2 respectively, and should satisfy: L1 = L2.

5. The drilling tool with a multi-purpose chamfering insert according to claim 2 or 3, characterized in that: The upper base surface (31) is provided with a chip breaker groove corresponding to the first chamfered cutting edge (38), and the lower base surface (32) is provided with a chip breaker groove corresponding to the second chamfered cutting edge (39).

6. The drilling tool with a multi-purpose chamfering insert according to any one of claims 1 to 3, characterized in that: The locking member (5) is a locking screw, a threaded hole is provided on the positioning bottom surface (41) of the chamfer blade installation groove (4), a blade screw hole (30) passing through an upper base surface (31) and a lower base surface (32) is provided on the chamfer blade (3), and the locking screw passes through the blade screw hole (30) and is connected to the threaded hole.

7. The drilling tool with a multi-purpose chamfering insert according to any one of claims 1 to 3, characterized in that: 30°≤A≤60°, 45°≤B≤75°.

8. The drilling tool with a multi-purpose chamfering insert according to claim 3, characterized in that: 105°≤C≤165°, 105°≤D≤165°.

Images