Sectional type stepped drill bit with coating wear-resistant strengthening structure

Abstract

The utility model belongs to the technical field of drill bits, particularly relates to a sectional type stepped drill bit provided with a coating wear-resistant strengthening structure, and aims to solve the problems that most existing stepped drill bits are inconvenient to dissipate heat when in use, so that the heat cannot be dissipated in time when the drill bits work, and the overheated drill bits easily affect the machining quality of workpieces. According to the scheme, the drill bit comprises a drill bit fixing handle, anti-skid lines are arranged on the outer surface of the drill bit fixing handle, and a cooling mechanism used for cooling a drill bit is arranged in the drill bit fixing handle. According to the drill bit, heat generated during operation of the drill bit body can be absorbed through the arranged heat pipe, the heat is transmitted to the heat exchange liquid in the liquid storage cavity, the cooling fins can be synchronously driven to rotate through rotation of the drill bit fixing handle, and the heat conduction plate absorbs the heat in the heat exchange liquid and transmits the heat to the cooling fins; convection heat dissipation is conducted between the cooling fins and air when the cooling fins rotate, the drill bit body is indirectly cooled, and practicability is improved.

Description

Technical Field

[0001] This utility model relates to a stepped drill bit, specifically a segmented stepped drill bit with a coating for enhanced wear resistance, belonging to the field of drill bit technology. Background Technology

[0002] A stepped drill bit, also known as a tiered drill or pagoda drill, is a specially designed drilling tool. Its main feature is that the drill body has multiple cutting edges or segments of different diameters, arranged in ascending order to form a stepped structure. This design allows the stepped drill bit to drill holes of various diameters on a single bit without frequent bit changes. During drilling, different diameter cutting edges or segments can be selected as needed, thus achieving the machining of holes of different diameters in a single operation, greatly improving work efficiency and processing flexibility.

[0003] In the prior art, such as the stepped drill bit disclosed in publication number CN211464929U, a shank and a body are included. The shank extends along the drill bit axis, and the body has a proximal end adjacent to the shank and a distal end opposite to the proximal end. The body defines a plurality of axially stacked, progressively larger steps, including a first step located at the distal end and a terminal step located at the proximal end. The drill bit also includes a chip flute located on the body. The chip flute defines an elongated groove extending from the distal end to the proximal end. It contributes to improving the speed and life of the stepped drill bit through the ratio between the helix angle and the rake angle of the cutting edges of the plurality of steps on the stepped drill bit.

[0004] In the above-mentioned technical method, the ratio between the helix angle and the rake angle of the cutting edge of the multiple steps of the stepped drill bit helps to improve the speed and life of the stepped drill bit. However, most stepped drill bits are not convenient for heat dissipation during use, which makes it difficult to dissipate the heat during the operation of the drill bit. Overheated drill bits can easily affect the processing quality of the workpiece. In view of this, a segmented stepped drill bit with a coating and wear-resistant reinforcement structure is provided to overcome the above defects. Utility Model Content

[0005] This invention addresses the problem that most stepped drill bits are inconvenient to dissipate heat during use, resulting in the drill bit not being able to dissipate heat in time and overheating, which can easily affect the processing quality of the workpiece. It provides a segmented stepped drill bit with a coating to enhance wear resistance.

[0006] This utility model achieves the above-mentioned objective through the following technical solution: a segmented stepped drill bit with a coating for enhanced wear resistance, including a drill bit fixing shank, the outer surface of which is provided with anti-slip texture, the inside of which is provided with a cooling mechanism for cooling the drill bit, and one end of which is provided with a cutting mechanism for cutting the workpiece.

[0007] The cooling mechanism includes a liquid storage chamber located inside the drill bit fixing shank. A connecting groove located at the end of the drill bit fixing shank is provided on the left side of the liquid storage chamber. A heat pipe is inserted into the connecting groove. A heat-conducting plate is fixed to the inner wall of the drill bit fixing shank. Four sets of heat dissipation fins are fixed to the outer surface of the heat-conducting plate.

[0008] As a further improvement of this utility model, the inner wall of the connecting groove is fixed with a limiting ring that abuts against the heat pipe.

[0009] As a further embodiment of this utility model: the cutting mechanism includes a drill bit body, which is mounted on the outer surface of the heat pipe, and the outer wall of the drill bit body is coated with a wear-resistant coating.

[0010] As a further improvement of this utility model: the wear-resistant coating is made of titanium nitride material, and the outer surface of the drill bit body is provided with chip removal grooves.

[0011] As a further embodiment of this utility model: a fixing bolt is installed inside the drill bit body, and the end of the fixing bolt is inserted into a limiting hole opened on the heat pipe. A fixing groove is opened on the inner wall of the drill bit body for insertion and connection with the heat pipe.

[0012] As a further improvement of this utility model: the upper surface of the heat pipe is provided with a connection hole, and a limiting rod that is telescopically connected to the drill bit fixing shank is inserted into the connection hole.

[0013] As a further improvement of this utility model: a compression spring is sleeved on the outer surface of the limiting rod, and a movable ring fixedly connected to the limiting rod is abutted on the lower surface of the compression spring.

[0014] The beneficial effects of this utility model are: by setting up a heat pipe, it can absorb the heat generated by the drill bit body during operation, and then transfer the heat to the heat exchange fluid in the storage chamber. By rotating the drill bit fixing shank, the heat sink will rotate synchronously, and the heat conduction plate absorbs the heat in the heat exchange fluid and transfers the heat to the heat sink. When the heat sink rotates, it convects with the air to dissipate heat, indirectly cooling the drill bit body and improving its practicality.

[0015] By manually pulling the limiting rod, the end of the limiting rod is separated from the connecting hole. With the cooperation of the connecting groove, the limiting hole can be disassembled and replaced. The limiting ring can play a limiting role. After replacement, the limiting rod is released. During the process of the compression spring extending and resetting itself, it will push the limiting rod into the connecting hole to fix the heat pipe for easy use. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a cross-sectional structural diagram of the drill bit fixing shank of this utility model;

[0018] Figure 3 This is a three-dimensional structural diagram of the drill bit body of this utility model;

[0019] Figure 4 This utility model Figure 2 Enlarged view of point A in the middle.

[0020] In the diagram: 1. Drill bit retaining shank; 2. Anti-slip texture; 3. Liquid reservoir; 31. Connecting groove; 32. Heat pipe; 33. Limiting ring; 34. Heat-conducting plate; 35. Heat sink; 4. Drill bit body; 41. Wear-resistant coating; 42. Chip removal groove; 43. Fixing bolt; 44. Limiting hole; 45. Fixing groove; 5. Connecting hole; 6. Limiting rod; 7. Compression spring; 8. Movable ring. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0022] like Figures 1 to 4 As shown, a segmented stepped drill bit with a coating for enhanced wear resistance includes a drill bit retaining shank 1. The outer surface of the drill bit retaining shank 1 is provided with anti-slip texture 2. The inside of the drill bit retaining shank 1 is provided with a cooling mechanism for cooling the drill bit. One end of the drill bit retaining shank 1 is provided with a cutting mechanism for cutting the workpiece.

[0023] The cooling mechanism includes a liquid storage chamber 3, which is located inside the drill bit fixing shank 1. A connecting groove 31, located at the end of the drill bit fixing shank 1, is provided on the left side of the liquid storage chamber 3. A heat pipe 32 is inserted into the connecting groove 31. A heat-conducting plate 34 is fixed to the inner wall of the drill bit fixing shank 1, and four sets of heat dissipation fins 35 are fixed to the outer surface of the heat-conducting plate 34. A limiting ring 33, which abuts against the heat pipe 32, is fixed to the inner wall of the connecting groove 31. This connects and fixes the stepped drill bit and the output shaft of the drive device. By fixing the drill bit fixing shank 1 and the output shaft of the device, the anti-slip texture 2 provides an anti-slip function, thereby ensuring the connection... The stability of the system is ensured by the drive device rotating the drill bit fixing shank 1, which in turn drives the drill bit body 4 to rotate and cut the workpiece. The chip removal groove 42 on the drill bit body 4 can remove chips. The heat pipe 32 can absorb the heat generated by the drill bit body 4 during operation and then transfer the heat to the heat exchange fluid in the liquid storage chamber 3. The rotation of the drill bit fixing shank 1 will synchronously drive the heat sink 35 to rotate. The heat conduction plate 34 absorbs the heat in the heat exchange fluid and transfers the heat to the heat sink 35. When the heat sink 35 rotates, it will convect with the air to dissipate heat, indirectly cooling the drill bit body 4 and improving its practicality. Example 2

[0024] In addition to all the technical features in Embodiment 1, this embodiment also includes: a cutting mechanism comprising a drill bit body 4, which is mounted on the outer surface of the heat pipe 32. The outer wall of the drill bit body 4 is coated with a wear-resistant coating 41, which is made of titanium nitride. A chip removal groove 42 is provided on the outer surface of the drill bit body 4. A fixing bolt 43 is installed inside the drill bit body 4. The end of the fixing bolt 43 is inserted into a limiting hole 44 on the heat pipe 32. A fixing groove 45 is provided on the inner wall of the drill bit body 4 for insertion and connection with the heat pipe 32. A connecting hole 5 is provided on the upper surface of the heat pipe 32. A limiting rod 6, which is telescopically connected to the drill bit fixing handle 1, is inserted into the connecting hole 5. A compression spring 7 is sleeved on the outer surface of the limiting rod 6. A movable ring 8, which is fixedly connected to the limiting rod 6, abuts against the lower surface of the compression spring 7. The cutting mechanism includes a drill bit body 4. The wear-resistant coating 41 is made of titanium nitride material, which has good wear resistance and heat resistance, thus achieving a strengthening effect. By unscrewing the fixing bolt 43 on the drill bit body 4, the fixing bolt 43 and the limiting hole 44 on the heat pipe 32 are separated. With the cooperation of the fixing groove 45, the drill bit body 4 can be disassembled, which is convenient for individual replacement of the drill bit body 4. By manually pulling the limiting rod 6, the end of the limiting rod 6 is separated from the connecting hole 5. When the limiting rod 6 moves, it drives the movable ring 8 to compress the compression spring 7. At this time, with the cooperation of the connecting groove 31, the limiting hole 44 can be disassembled and replaced. The limiting ring 33 can play a limiting role. After the replacement is completed, the limiting rod 6 is released. During the process of the compression spring 7 extending and returning to its original position, it will push the limiting rod 6 into the connecting hole 5 to fix the heat pipe 32.

[0025] Working Principle: Before using the segmented stepped drill bit with a wear-resistant coating, the drill bit and the output shaft of the drive device are connected and fixed. The anti-slip texture 2, provided by fixing the drill bit fixing shank 1 to the output shaft, ensures a stable connection. The drive device rotates the drill bit fixing shank 1, which in turn drives the drill bit body 4 to rotate and cut the workpiece. The chip removal groove 42 on the drill bit body 4 removes chips. The heat pipe 32 absorbs the heat generated during the operation of the drill bit body 4 and transfers it to the heat exchange fluid in the storage chamber 3. The rotation of the drill bit fixing shank 1 synchronously rotates the heat sink 35. The heat-conducting plate 34 absorbs the heat from the heat exchange fluid and transfers it to the heat sink 35. This allows the heat sink 35 to convect with the air during rotation, indirectly cooling the drill bit body 4. To improve practicality, a wear-resistant coating 41 is applied to the drill bit body 4. This coating, made of titanium nitride, provides excellent wear and heat resistance, thus enhancing its functionality. By unscrewing the fixing bolt 43 on the drill bit body 4, the fixing bolt 43 and the limiting hole 44 on the heat pipe 32 are separated. With the cooperation of the fixing groove 45, the drill bit body 4 can be disassembled for easy replacement. By manually pulling the limiting rod 6, the end of the limiting rod 6 is separated from the connecting hole 5. As the limiting rod 6 moves, it drives the movable ring 8 to compress the compression spring 7. With the cooperation of the connecting groove 31, the limiting hole 44 can be disassembled and replaced. The limiting ring 33 serves as a limiting element. After replacement, the limiting rod 6 is released. During the extension and reset of the compression spring 7, the limiting rod 6 is pushed into the connecting hole 5, fixing the heat pipe 32 for convenient use.

[0026] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0027] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A segmented stepped drill bit with a wear-resistant coating structure, comprising a drill bit retaining shank (1), characterized in that: The outer surface of the drill bit fixing shank (1) is provided with anti-slip texture (2), the inside of the drill bit fixing shank (1) is provided with a cooling mechanism for cooling the drill bit, and one end of the drill bit fixing shank (1) is provided with a cutting mechanism for cutting the workpiece. The cooling mechanism includes a liquid storage chamber (3), which is located inside the drill bit fixing handle (1). The left side of the liquid storage chamber (3) is provided with a connecting groove (31) located at the end of the drill bit fixing handle (1). A heat pipe (32) is inserted into the connecting groove (31). A heat-conducting plate (34) is fixed on the inner wall of the drill bit fixing handle (1). Four sets of heat dissipation fins (35) are fixed on the outer surface of the heat-conducting plate (34).

2. The segmented stepped drill bit with a wear-resistant coating structure according to claim 1, characterized in that: The inner wall of the connecting groove (31) is fixed with a limiting ring (33) that abuts against the heat pipe (32).

3. A segmented stepped drill bit with a wear-resistant coating structure according to claim 2, characterized in that: The cutting mechanism includes a drill bit body (4), which is mounted on the outer surface of the heat pipe (32), and the outer wall of the drill bit body (4) is coated with a wear-resistant coating (41).

4. A segmented stepped drill bit with a wear-resistant coating structure as described in claim 3, characterized in that: The wear-resistant coating (41) is made of titanium nitride material, and the outer surface of the drill bit body (4) is provided with chip removal grooves (42).

5. A segmented stepped drill bit with a wear-resistant coating structure according to claim 4, characterized in that: The drill bit body (4) is equipped with a fixing bolt (43) inside. The end of the fixing bolt (43) is connected to a limiting hole (44) opened on the heat pipe (32). The inner wall of the drill bit body (4) is provided with a fixing groove (45) that is connected to the heat pipe (32).

6. A segmented stepped drill bit with a wear-resistant coating structure according to claim 5, characterized in that: The heat pipe (32) has a connection hole (5) on its upper surface, and a limiting rod (6) that is telescopically connected to the drill bit fixing handle (1) is inserted into the connection hole (5).

7. A segmented stepped drill bit with a wear-resistant coating structure according to claim 6, characterized in that: The outer surface of the limiting rod (6) is fitted with a compression spring (7), and the lower surface of the compression spring (7) abuts against a movable ring (8) that is fixedly connected to the limiting rod (6).

Images