Hollow high-speed trepanning drill bit

Abstract

The invention provides a hollow high-speed trepanning drill bit which comprises a hollow drill bit body, a drill handle and a telescopic drill assembly, the drill handle is arranged in the center of one end of the hollow drill bit body, the telescopic drill assembly is arranged on the inner side of the hollow drill bit body, and the telescopic drill assembly comprises a telescopic drill bit body, connecting rods and an adjusting rotary disc. One ends of the connecting rods penetrate through the end of the hollow drill bit, a plurality of containing grooves used for containing one ends of the connecting rods are formed in the side wall of the drill handle, the ends of the connecting rods extend to the outer side of the hollow drill bit and are embedded into the containing grooves, and guide blocks are arranged on the outer sides of the connecting rods correspondingly. A plurality of guide grooves which are arranged in the axial direction and used for containing the guide blocks are formed in the inner wall of the hollow drill bit, a plurality of tooth blocks are arranged on the inner sides of the connecting rods in the axial direction, an adjusting rotary disc is arranged on the inner sides of the connecting rods, and spiral protruding strips meshed with the tooth blocks are arranged on the outer side wall of the adjusting rotary disc. The adjusting rotary disc is rotationally arranged at one end of the hollow drill bit, the adjusting rotary disc is rotated through a tool, the connecting rod is driven to move under the cooperation of the spiral protruding strip and the tooth block, the telescopic drill bit stretches out of the hollow drill bit or retracts into the hollow drill bit, and therefore the tapping drill bit can meet the drilling requirements of two diameter sizes, and rapid switching of the drilling size is achieved; frequent mounting and dismounting are not needed, and the drilling efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of hole-making tools, and in particular relates to a hollow high-speed hole-making drill bit. Background Art

[0002] The center part of the hollow drill bit adopts a hollow structure design, which can take away part of the material when drilling, achieving a faster and more effective drilling effect. It is mainly used for drilling and coring steel plates, steel, and stainless steel. The hollow drill bit is characterized by the use of multi-blade annular cutting. The drill bit only cuts the outer diameter annular part of the hole, and does not cut the middle part, which reduces the resistance during drilling. Therefore, the hole opening efficiency is 3-5 times that of the twist drill. At the same time, due to the hollow structure design, the lubrication and coolant in the space can circulate more fully, thereby reducing the possibility of damage to the drill bit and the workpiece and improving the drilling accuracy. The hollow drill bits in the prior art have a variety of sizes and specifications. When drilling holes according to different hole diameter requirements, it is necessary to replace hollow drills of different sizes.

[0003] Chinese patent document: CN202022248442.1, discloses a glass drilling machine suitable for different hole diameters. In this application, drill bit b is arranged inside drill bit a, and drill bit c is arranged inside drill bit b. When drilling holes of different diameters, the outer drill bit is removed to meet the hole diameter size. During the drilling process, the drill bit c inside still needs to cut the inner part. This hole opening method is not suitable for steel plates and steel materials, and will increase additional hole opening consumption. Moreover, when replacing the drill bit, frequent disassembly and installation are required, which is relatively cumbersome. Summary of the invention

[0004] The main purpose of the present invention is to provide a hollow high-speed hole-making drill bit, which solves the problem that the hole-making drill bits in the prior art have a single hole size and cannot meet the hole-making requirements of hard materials with different hole diameters.

[0005] The specific technical solutions are as follows:

[0006] A hollow high-speed hole-opening drill bit, comprising a hollow drill bit, a drill shank and a telescopic drill assembly, wherein the hollow drill bit is a cylindrical structure with an axis, the drill shank is arranged at the center of one end of the hollow drill bit, a plurality of external cutting parts are evenly distributed at the opening of the other end of the hollow drill bit, and an external chip removal groove is arranged on the outer wall of the hollow drill bit on one side of each cutting part; the telescopic drill assembly is arranged on the inner side of the hollow drill bit, and the telescopic drill assembly comprises a telescopic drill bit, a connecting rod and an adjusting turntable, the telescopic drill bit is in the shape of a circular ring, a plurality of internal cutting parts are evenly distributed along the circumferential direction on one end of the telescopic drill bit, and the position of each internal cutting part corresponds to the position of the external cutting part on the hollow drill bit; a plurality of connecting rods are evenly arranged along the circumferential direction on the other end of the telescopic drill bit, and the connecting rods are all arranged along the axial direction, one end of the connecting rod passes through the end of the hollow drill bit, and a plurality of connecting rods are arranged on the side wall of the drill shank A receiving groove for accommodating one end of the connecting rod, so that one end of the connecting rod extends to the outside of the hollow drill bit and is embedded in the receiving groove; a guide block is provided on the outer side of the several connecting rods, and a plurality of guide grooves arranged axially and used to accommodate the guide block are opened on the inner wall of the hollow drill bit, so that the guide block cooperates with the guide groove to guide the telescopic drill bit; a plurality of tooth blocks are arranged axially on the inner side of the several connecting rods, and the adjusting dial is arranged on the inner side of the several connecting rods, and a spiral convex strip meshing with the tooth block is provided on the outer side wall of the adjusting dial, so that the adjusting dial and each connecting rod are transmitted through the cooperation between the spiral convex strip and the tooth block; the adjusting dial is rotatably arranged at one end of the hollow drill bit, and the adjusting dial is rotated by a tool, so that the connecting rod is driven to move under the cooperation of the spiral convex strip and the tooth block, and the telescopic drill bit is extended out of the hollow drill bit or retracted into the hollow drill bit.

[0007] Furthermore, the outer cutting part and the inner cutting part both include a cutting block and a cutter head arranged on the cutting block, and one end of the hollow drill bit and the telescopic drill bit are provided with a groove for accommodating the cutting block, and the cutter head is respectively arranged on the inner side or the outer side of the end of each cutting block through the groove, so that the cutter head is located on the inner side or the outer side.

[0008] Furthermore, the positions of the cutter heads in the outer cutting part and the inner cutting part are symmetrically arranged.

[0009] Furthermore, an inner chip groove is provided on the outer wall of the telescopic drill bit, the direction and position of the inner chip groove are adapted to the outer chip groove, and a notch is provided on one side of the hollow drill bit and the telescopic drill bit located in the embedded groove, and the notch is located at one end of the outer chip groove and the inner chip groove respectively.

[0010] Furthermore, the width of the connecting rod is adapted to the width of the accommodating groove, and the outer side wall of the connecting rod is recessed into the side wall surface of the drill shank.

[0011] Furthermore, a rotating shaft is provided at the center of one end of the adjusting turntable, and the rotating shaft is rotatably arranged in the inner wall of one end of the hollow drill bit. An adjusting hole for tool screwing is opened at the center of the other end of the adjusting turntable.

[0012] Furthermore, a rotation groove is provided on the inner wall of one end of the hollow drill bit, a rotation seat is provided in the rotation groove, and the rotation seat sleeve is arranged on the outer side of the rotating shaft and is rotationally connected thereto.

[0013] Furthermore, the outer wall of the telescopic drill bit is arranged close to the inner wall of the hollow drill bit.

[0014] The beneficial effects of the present invention are embodied in:

[0015] (1) The present invention adopts a hollow drill bit with a telescopic drill assembly. By using a tool to rotate the adjustment dial, the extension and retraction of the telescopic drill bit inside the hollow drill bit can be adjusted, so that the hole-opening drill bit can be suitable for drilling holes of two diameter sizes, and the drilling size can be quickly switched without frequent installation and disassembly, thereby improving the drilling efficiency.

[0016] (2) The telescopic drill assembly of the present invention meshes with the tooth blocks on each connecting rod through the spiral convex pattern on the adjusting dial, so that the telescopic function of the telescopic drill bit can be achieved by rotating the adjusting dial with a tool. The overall structure is compact, easy to operate, and highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure when the telescopic drill bit in the present invention is retracted.

[0018] Figure 2 It is a schematic diagram of the structure when the telescopic drill bit of the present invention is extended.

[0019] Figure 3 It is a cross-sectional view of the telescopic drill bit of the present invention when it is retracted.

[0020] Figure 4 It is a cross-sectional view of the telescopic drill bit of the present invention when it is extended.

[0021] Figure 5 It is the front view of the present invention.

[0022] Explanation of the accompanying drawings: hollow drill bit 1, external cutting part 10, cutting block 101, cutter head 102, embedded groove 103, groove 104, external chip groove 11, notch groove 12, guide groove 13, rotating groove 14, rotating seat 15, drill shank 2, accommodating groove 21, telescopic drill bit 3, internal cutting part 30, internal chip groove 31, connecting rod 4, tooth block 41, guide block 42, adjusting turntable 5, spiral ridge 51, rotating shaft 52, adjusting hole 53. DETAILED DESCRIPTION

[0023] In order to make the technical solution of the present invention clearer, the present invention is further described below in conjunction with the accompanying drawings. Any equivalent replacement of the technical features of the technical solution of the present invention and any solution derived from conventional reasoning shall fall within the protection scope of the present invention. The fixed connection and fixed setting mentioned in the present invention are all common connection methods in the mechanical field, including welding, bolt and nut connection, and screw connection.

[0024] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0025] See attached Figure 1-5 The present embodiment provides a hollow high-speed hole-opening drill, comprising a hollow drill 1, a drill shank 2 and a telescopic drill assembly. The hollow drill 1 is a cylindrical structure with an axis. The drill shank 2 is arranged at the center of one end of the hollow drill 1. Four external cutting parts 10 are evenly distributed at the opening of the other end of the hollow drill 1. An external chip groove 11 is arranged on the outer wall of the hollow drill 1 at one side of each cutting part; a telescopic drill assembly is arranged on the inner side of the hollow drill 1, and the telescopic drill assembly comprises a telescopic drill 3, a connecting rod 4 and an adjusting dial 5. The telescopic drill 3 is annular, and the outer wall of the telescopic drill 3 is arranged close to the inner wall of the hollow drill 1. Four internal cutting parts 30 are evenly distributed along the circumferential direction on one end of the telescopic drill 3, and the position of each internal cutting part 30 corresponds to the position of the external cutting part 10 on the hollow drill 1. A plurality of connecting rods 4 are evenly arranged along the circumferential direction on the other end of the telescopic drill bit 3. The connecting rods 4 are fixedly connected to the end surface of the telescopic drill bit 3 by brazing. The connecting rods 4 are arranged along the axial direction. One end of the connecting rod 4 passes through the end of the hollow drill bit 1, and a plurality of accommodating grooves 21 for accommodating one end of the connecting rod 4 are opened on the side wall of the drill shank 2, so that one end of the connecting rod 4 extends to the outside of the hollow drill bit 1 and is embedded in the accommodating groove 21.

[0026] A guide block 42 is provided on the outer side of the plurality of connecting rods 4, and a plurality of guide grooves 13 are provided on the inner wall of the hollow drill bit 1, which are arranged along the axial direction and are used to accommodate the guide block 42, so that the guide block 42 cooperates with the guide groove 13 to guide the telescopic drill bit 3. A plurality of tooth blocks 41 are arranged along the axial direction on the inner side of the plurality of connecting rods 4, and an adjusting dial 5 is provided on the inner side of the plurality of connecting rods 4, and a spiral convex strip 51 meshing with the block is provided on the outer wall of the adjusting dial 5, so that the adjusting dial 5 and each connecting rod 4 are connected to each other through the spiral convex strip 51 and the tooth block 41. The adjusting dial 5 is rotatably provided at one end of the hollow drill bit 1, and the adjusting dial 5 is rotated by a tool, and the connecting rod 4 is driven to move under the cooperation of the spiral convex strip 51 and the tooth block 41, and the telescopic drill bit 3 is extended out of the hollow drill bit 1 or retracted into the hollow drill bit 1.

[0027] Due to the meshing structure between the spiral convex strip 51 and the tooth block 41, the telescopic drill bit 3 will not automatically retract into the hollow drill bit 1 due to external force when rotating to open a hole. During the cutting process of the telescopic drill bit 3, the guide block 42 and the guide groove 13 cooperate to limit the rotation.

[0028] In this embodiment, the outer cutting part 10 and the inner cutting part 30 both include a cutting block 101 and a cutter head 102 arranged on the cutting block 101. One end of the hollow drill bit 1 and the telescopic drill bit 3 are provided with a groove 103 for accommodating the cutting block 101. The cutting block 101 and the groove 103 are fixed by bolts. The inner side or outer side of the end of each cutting block 101 is provided with a cutter head 102 through a groove 104, and the cutter head 102 is located on the inner side or the outer side. The positions of the cutter heads 102 in the four outer cutting parts 10 and the inner cutting part 30 are symmetrically arranged in pairs, that is, two cutter heads 102 are located on the inner side and two cutter heads 102 are located on the outer side, so that the outer cutting part 10 can realize inner and outer layer cutting of the hole through the cutter heads 102 on the inner and outer sides to ensure the cutting quality.

[0029] In this embodiment, an inner chip groove 31 is provided on the outer wall of the telescopic drill bit 3, and the direction and position of the inner chip groove 31 are adapted to the outer chip groove 11, and the inner chip groove 31 is gradually shallower, and the hollow drill bit 1 and the telescopic drill bit 3 are both provided with a notch groove 12 on one side of the embedding groove 103, and the notch groove 12 is respectively located at one end of the outer chip groove 11 and the inner chip groove 31, so that when the telescopic drill bit 3 is drilling and removing chips, the chips can be guided to the outer chip groove 11 on the outer wall of the hollow drill bit 1 through the inner chip groove 31, so as to ensure that the telescopic drill bit 3 can remove chips normally when drilling.

[0030] In this embodiment, the width of the connecting rod 4 is adapted to the width of the accommodating groove 21, and the outer wall of the connecting rod 4 is recessed into the side wall surface of the drill shank 2, so as to prevent the drill shank 2 from limiting the connecting rod 4 when it is clamped by the drill chuck. This structural design ensures that the telescopic drill bit 3 can be freely adjusted during the clamping process.

[0031] In this embodiment, a rotating shaft 52 is provided at the center of one end of the adjusting dial 5. The rotating shaft 52 is rotatably disposed in the inner wall of one end of the hollow drill bit 1. An adjusting hole 53 for tool screwing is opened at the center of the other end of the adjusting dial 5.

[0032] In this embodiment, a rotating groove 14 is opened on the inner wall of one end of the hollow drill bit 1, and a rotating seat 15 is provided in the rotating groove 14. The rotating seat 15 is sleeved on the outside of the rotating shaft 52 and is rotatably connected thereto. There is a certain friction resistance between the rotating seat 15 and the rotating shaft 52 to prevent the adjusting turntable 5 from loosening and causing the telescopic drill bit 3 to move.

[0033] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A hollow high-speed hole drill, characterized in that: The invention comprises a hollow drill bit (1), a drill shank (2) and a telescopic drill assembly. The hollow drill bit (1) is a cylindrical structure with an axis. The drill shank (2) is arranged at the center of one end of the hollow drill bit (1). A plurality of external cutting portions (10) are evenly distributed at the opening of the other end of the hollow drill bit (1). An external chip removal groove (11) is arranged on one side of each cutting portion on the outer wall of the hollow drill bit (1). The telescopic drill assembly is arranged on the inner side of the hollow drill bit (1). The telescopic drill assembly comprises a telescopic drill bit (3), a connecting rod (4) and an adjusting turntable (5). The telescopic drill bit The telescopic drill bit (3) is in the shape of a ring. A plurality of inner cutting portions (30) are evenly distributed along the circumference on one end of the telescopic drill bit (3). The position of each inner cutting portion (30) corresponds to the position of the outer cutting portion (10) on the hollow drill bit (1). A plurality of connecting rods (4) are evenly distributed along the circumference on the other end of the telescopic drill bit (3). The connecting rods (4) are all arranged along the axial direction. One end of the connecting rod (4) passes through the end of the hollow drill bit (1). A plurality of accommodating grooves (21) for accommodating one end of the connecting rod (4) are opened on the side wall of the drill shank (2). One end of the connecting rod (4) extends to the outside of the hollow drill bit (1) and is embedded in the accommodating groove (21); a plurality of connecting rods (4) are provided with guide blocks (42) on the outside, and a plurality of guide grooves (13) arranged along the axial direction and used to accommodate the guide blocks (42) are opened on the inner wall of the hollow drill bit (1), so that the guide blocks (42) cooperate with the guide grooves (13) to guide the telescopic drill bit (3); a plurality of tooth blocks (41) are arranged along the axial direction on the inner sides of the plurality of connecting rods (4), and the adjusting grooves (13) are arranged on the inner sides of the plurality of connecting rods (4). The adjusting turntable (5) is provided with a spiral convex strip (51) meshing with the tooth block (41) on the outer side wall of the adjusting turntable (5), so that the adjusting turntable (5) and each connecting rod (4) are connected to each other through the cooperation between the spiral convex strip (51) and the tooth block (41); the adjusting turntable (5) is rotatably arranged at one end of the hollow drill bit (1), and the adjusting turntable (5) is rotated by a tool, so that the connecting rod (4) is driven to move under the cooperation of the spiral convex strip (51) and the tooth block (41), and the telescopic drill bit (3) is extended out of the hollow drill bit (1) or retracted into the hollow drill bit (1).

2. A hollow high-speed hole drilling drill according to claim 1, characterized in that: The outer cutting part (10) and the inner cutting part (30) both comprise a cutting block (101) and a cutter head (102) arranged on the cutting block (101); one end of the hollow drill bit (1) and the telescopic drill bit (3) are both provided with an embedding groove (103) for accommodating the cutting block (101); the cutter head (102) is arranged on the inner side or the outer side of the end of each cutting block (101) through a groove (104), and the cutter head (102) is located on the inner side or the outer side.

3. A hollow high-speed hole drilling drill according to claim 2, characterized in that: The positions of the cutting heads (102) in the plurality of outer cutting parts (10) and inner cutting parts (30) are symmetrically arranged.

4. A hollow high-speed hole drilling drill according to claim 2, characterized in that: An inner chip groove (31) is provided on the outer wall of the telescopic drill bit (3), the direction and position of the inner chip groove (31) are adapted to the outer chip groove (11), and a notch groove (12) is provided on one side of the hollow drill bit (1) and the telescopic drill bit (3) located at the embedded groove (103), and the notch groove (12) is located at one end of the outer chip groove (11) and the inner chip groove (31), respectively.

5. A hollow high-speed hole drilling drill according to claim 1, characterized in that: The width of the connecting rod (4) is adapted to the width of the accommodating groove (21), and the outer side wall of the connecting rod (4) is recessed into the side wall surface of the drill shank (2).

6. A hollow high-speed hole drilling drill according to claim 1, characterized in that: A rotating shaft (52) is provided at the center of one end of the adjusting turntable (5), and the rotating shaft (52) is rotatably arranged in the inner wall of one end of the hollow drill bit (1). An adjusting hole (53) for tool screwing is opened at the center of the other end of the adjusting turntable (5).

7. A hollow high-speed hole-opening drill bit as claimed in claim 6, characterized in that: A rotation groove (14) is provided on the inner wall of one end of the hollow drill bit (1), a rotation seat (15) is provided in the rotation groove (14), and the rotation seat (15) is sleeved on the outer side of the rotation shaft (52) and is rotationally connected thereto.

8. A hollow high-speed hole drilling drill according to claim 1, characterized in that: The outer wall of the telescopic drill bit (3) is arranged close to the inner wall of the hollow drill bit (1).

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