Chamfering type fishtail drill
By designing chamfered fishtail drills, including cutting chamfered planes at the fishtail tip structure and combining other cutting structures, the existing fishtail drills have solved the problem of too low life and insufficient drilling capacity in the processing of target holes of FR4 plates, and achieved extended life and improved drilling capacity.
Patent Information
- Application Number
- CN202420371667.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-27
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-02-27
AI Technical Summary
The existing fishtail drill has too low life during the processing of target holes for ordinary FR4 plates and insufficient drilling capacity, which cannot meet customers' requirements for target hole life.
A chamfered fishtail drill is designed, with two centers symmetrical fishtail tip structures at the front end of the blade, and a first chamfered plane and a second chamfered plane are cut at the fishtail tip structure. Combined with the design of chip discharge groove, main tool surface, secondary tool surface and spiral cutting groove, the stress area and friction area during drilling are enhanced.
Through this design, the life of fishtail drilling in the processing of plate target holes is extended, the drilling capacity is improved, and the customer's requirements for the life of target holes is met.
Smart Images
Figure CN222552266U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of drill bit processing, and in particular to a chamfered fishtail drill. Background Art
[0002] like Figure 1-2 As shown, the fishtail angle of the existing fishtail drill is between 90° and 120°, the fishtail tip is sharp, and the blade is straight. This fishtail drill has a very low life when processing target holes in ordinary FR4 plates, and its drilling ability is insufficient, which cannot meet the customer's requirements for the life of the target holes.
[0003] Therefore, there is an urgent need for a chamfered fishtail drill with a long plate target hole processing life and strong drilling ability to overcome the above-mentioned defects. Utility Model Content
[0004] The purpose of the present application is to provide a chamfered fishtail drill with a long plate target hole processing life and a strong drilling ability.
[0005] To achieve the above-mentioned purpose, an embodiment of the present application provides a chamfered fishtail drill, including a shank and a blade, the rear end of the blade is connected to the shank, and the front end of the blade forms two centrally symmetrical fishtail tip structures, and a first chamfered plane is cut at any of the fishtail tip structures, and the two first chamfered planes are centrally symmetrical.
[0006] Preferably, an included angle α1 between the first chamfered plane and the axis of the blade portion is 10°-120°.
[0007] Preferably, the front end surface of the blade portion is provided with two centrally symmetrical chip grooves, two centrally symmetrical main tool faces and two centrally symmetrical secondary tool faces, one of the chip grooves is located on one side of the two main tool faces, and the other chip groove is located on the other side of the two main tool faces, any of the main tool faces intersects with the corresponding chip groove to form a main cutting edge, and the peripheral side surface of the blade portion is provided with two spirally symmetrical cutting grooves, any of the cutting grooves intersects with the peripheral side surface of the blade portion to form a side edge corresponding to the main tool face.
[0008] Preferably, any of the first chamfered planes intersects with the adjacent chip groove to form a first intersection line, and any of the chip grooves intersects with the adjacent side edge to form a second intersection line, and the length D2 of the second intersection line is 1 / 3-1 / 2 times the length D1 of the first intersection line.
[0009] Preferably, any of the fishtail tip structures is provided with a second chamfered plane adjacent to the first chamfered plane, and the two second chamfered planes are symmetrical with respect to the center.
[0010] Preferably, the included angle α2 between the first chamfered plane and the adjacent second chamfered plane is 100°-120°.
[0011] Preferably, any of the second chamfered planes intersects with the adjacent chip groove to form a third intersection line, and the length D3 of the third intersection line is 1 / 3-1 / 2 times the length D1 of the first intersection line.
[0012] Compared with the prior art, the chamfered fishtail drill of the embodiment of the present application includes a shank and a blade, the rear end of the blade is connected to the shank, and the front end of the blade forms two centrally symmetrical fishtail tip structures, and a first chamfering plane is cut at any of the fishtail tip structures, and the two first chamfering planes are centrally symmetrical, so that the chamfered fishtail drill of the embodiment of the present application has a long processing life for plate target holes and a strong drilling ability. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0014] Figure 1 It is a side view of a fishtail drill in the prior art.
[0015] Figure 2 It is a front side view of a fishtail drill in the prior art.
[0016] Figure 3 It is a side view of the chamfered fishtail drill according to the first embodiment of the present application.
[0017] Figure 4 for Figure 3 A partial enlarged view of the portion indicated by A in the chamfered fishtail drill shown.
[0018] Figure 5 for Figure 3 The chamfered fishtail drill is shown in a front view looking backward along the axial direction of the blade.
[0019] Figure 6 It is a side view of a chamfered fishtail drill according to the second embodiment of the present application.
[0020] Figure 7 for Figure 6 A partial enlarged view of the portion indicated by B in the chamfered fishtail drill shown.
[0021] Figure 8 for Figure 6 The chamfered fishtail drill is shown in a front view looking backward along the axial direction of the blade. DETAILED DESCRIPTION
[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.
[0023] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.
[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0025] First of all, in the description of the embodiments of the present application, it needs to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.
[0026] Secondly, the terms "first", "second", "third", etc. are only used to distinguish descriptions, without any distinction of order or importance, and cannot be understood as indicating or implying relative importance. The characteristics specified as "first" or "second" may explicitly or implicitly include one or more of such characteristics.
[0027] Furthermore, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0028] In addition, in the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, an electromagnetic connection, or even a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0029] In addition, the “and / or” in this application, such as “Feature 1 and / or Feature 2”, refers to the three cases that it can be “Feature 1” alone, “Feature 2” alone, or “Feature 1” plus “Feature 2”. The “and / or” in this application, such as “Feature 1 and / or Feature 2”, refers to the three cases that it can be “Feature 1” alone, “Feature 2” alone, or “Feature 1” plus “Feature 2”.
[0030] See also Figure 3-5 The chamfered fishtail drill 1a of the first embodiment of the present application includes a shank 10 and a blade 20. The front end of the blade 20 is formed with two centrally symmetrical fishtail tip structures 21. The rear end 20b of the blade 20 is connected to the shank 10. A first chamfered plane 21a is cut at any fishtail tip structure 21. The two first chamfered planes 21a are centrally symmetrical, which is beneficial to increasing the force area during drilling, increasing the friction area between the fishtail tip structure 21 and the plate, reducing the wear of the fishtail tip structure 21, and achieving the effect of prolonging the service life.
[0031] For example, in the chamfered fishtail drill 1a of the first embodiment of the present application, the angle α1 between the first chamfered plane 21a and the axis O of the blade 20 is 10°, or 75°, or 100°, or 120°, which is beneficial to increase the force area during drilling, increase the friction area between the fishtail tip structure 21 and the plate, reduce the wear of the fishtail tip structure 21, and achieve the effect of improving the service life. It can be understood that the angle α1 between the first chamfered plane 21a and the axis O of the blade 20 can be 10°-120°.
[0032] It should be explained that the angle α1 between the first chamfered plane 21 a and the axis O of the blade 20 is the minimum angle between the plane where the first chamfered plane 21 a is located and the straight line where the axis O of the blade 20 is located.
[0033] like Figure 4-5As shown, in the chamfered fishtail drill 1a of the first embodiment of the present application, two centrally symmetrical chip grooves 22, two centrally symmetrical main cutting surfaces 23 and two centrally symmetrical secondary cutting surfaces 24 are provided on the front end 20a surface of the blade 20, one chip groove 22 is located on one side of the two main cutting surfaces 23, and the other chip groove 22 is located on the other side of the two main cutting surfaces 23, any main cutting surface 23 intersects with the corresponding chip groove 22 to form a main cutting edge 23a, and two spirally symmetrical cutting grooves 25 are opened on the peripheral side surface of the blade 20, and any cutting groove 25 intersects with the peripheral side surface of the blade 20 to form a side edge 25a corresponding to the main cutting surface 23.
[0034] like Figure 4-5 As shown, in the chamfered fishtail drill 1a of the second embodiment of the present application, any first chamfered plane 21a intersects with the adjacent chip groove 22 to form a first intersection line, and any chip groove 22 intersects with the adjacent side edge 25a to form a second intersection line. The first intersection line is D1, and the second intersection line is D2. The length D2 of the second intersection line is 1 / 3-1 / 2 times the length D1 of the first intersection line, which is beneficial to increase the force area during drilling, increase the friction area between the fishtail tip structure 21 and the plate, reduce the wear of the fishtail tip structure 21, and achieve the effect of improving the service life.
[0035] See also Figure 6-8 , is the chamfered fishtail drill 1b of the second embodiment of the present application, which has the following differences compared with the chamfered fishtail drill 1b of the first embodiment of the present application:
[0036] (1) Compared with the chamfered fishtail drill 1b of the first embodiment of the present application, the chamfered fishtail drill 1b of the second embodiment of the present application adds a second chamfered plane 21b corresponding to the first chamfered plane 21a, wherein the second chamfered plane 21b is cut on the fishtail tip structure 21, and the two second chamfered planes 21b are centrally symmetrical and co-located on a second chamfered plane 21 with the axis O of the blade 20 as the rotation center, thereby further increasing the force area during drilling, increasing the friction area between the fishtail tip structure 21 and the plate, reducing the wear of the fishtail tip structure 21, and achieving the effect of increasing the service life.
[0037] (2) Compared with the chamfered fishtail drill 1b of the first embodiment of the present application, the angle α1 between the first chamfered plane 21a and the axis O of the blade 20 in the chamfered fishtail drill 1b of the second embodiment of the present application is not necessarily 10°-120°.
[0038] Furthermore, in the chamfered fishtail drill 1b of the second embodiment of the present application, the angle α2 between the second chamfered plane 21b and the adjacent first chamfered plane is 100°, or 115°, or 120°, to ensure that the force area during drilling is increased, the friction area between the fishtail tip structure 21 and the plate is increased, and the wear of the fishtail tip structure 21 is reduced, thereby achieving the effect of improving the service life; it should be noted that the cone angle α2 of the second chamfered plane can be 100°-120°.
[0039] Furthermore, in the chamfered fishtail drill 1b of the second embodiment of the present application, any second chamfered plane 21b intersects with the adjacent chip groove 22 to form a third intersection line, and the third intersection line is D3. The length D3 of the third intersection line is 1 / 3-1 / 2 times the length D1 of the first intersection line, so as to ensure that the force area during drilling is increased, the friction area between the fishtail tip structure 21 and the plate is increased, and the wear of the fishtail tip structure 21 is reduced, thereby achieving the effect of improving the service life.
[0040] Except for the above-mentioned differences, the rest of the structure of the chamfered fishtail drill 1 b of the second embodiment of the present application is exactly the same as that of the chamfered fishtail drill 1 b of the first embodiment of the present application, and thus will not be described in detail here.
[0041] It should be noted that in the accompanying drawings, the directions indicated by the arrows Z are all forward and parallel to the axial direction of the blade 20, and the present invention is not limited thereto.
[0042] Compared with the prior art, since the chamfered fishtail drill 1a of the embodiment of the present application includes a shank 10 and a blade 20, the rear end 20b of the blade 20 is connected to the shank 10, and the front end 20a of the blade 20 forms two centrally symmetrical fishtail tip structures 21, and a first chamfered plane 21a is cut at any fishtail tip structure 21, and the two first chamfered planes 21a are centrally symmetrical, the chamfered fishtail drill 1a of the embodiment of the present application has a long plate target hole processing life and a strong drilling ability.
[0043] The above disclosure is only a preferred example of the present application, and its role is to facilitate the technical personnel in this field to understand and implement it, but it cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made within the scope recorded in this application still fall within the scope covered by this application.
Claims
1. A chamfered fishtail drill, comprising a shank and a blade, wherein the rear end of the blade is connected to the shank, and the front end of the blade is formed with two centrally symmetrical fishtail tip structures, characterized in that: A first chamfered plane is cut at any of the fishtail tip structures, and the two first chamfered planes are centrally symmetrical; Wherein, the front end surface of the blade portion is provided with two centrally symmetrical chip grooves, two centrally symmetrical main tool faces and two centrally symmetrical secondary tool faces, one of the chip grooves is located on one side of the two main tool faces, and the other chip groove is located on the other side of the two main tool faces, any of the main tool faces intersects with the corresponding chip groove to form a main cutting edge, and the peripheral side surface of the blade portion is provided with two spirally symmetrical cutting grooves, and any of the cutting grooves intersects with the peripheral side surface of the blade portion to form a side edge corresponding to the main tool face; Any of the first chamfered planes intersects with the adjacent chip groove to form a first intersection line, and any of the chip grooves intersects with the adjacent side edge to form a second intersection line, and the length D2 of the second intersection line is 1 / 3-1 / 2 times the length D1 of the first intersection line.
2. The chamfered fishtail drill according to claim 1, characterized in that: An included angle α1 between the first chamfered plane and the axis of the blade portion is 10°-120°.
3. The chamfered fishtail drill according to claim 1, characterized in that: A second chamfered plane adjacent to the first chamfered plane is cut at any of the fishtail tip structures, and the two second chamfered planes are symmetrical with respect to the center.
4. The chamfered fishtail drill according to claim 3, characterized in that: An included angle α2 between the first chamfered plane and the adjacent second chamfered plane is 100°-120°.
5. The chamfered fishtail drill according to claim 3, characterized in that: Any of the second chamfered planes intersects with the adjacent chip groove to form a third intersection line, and the length D3 of the third intersection line is 1 / 3-1 / 2 times the length D1 of the first intersection line.