A tungsten step drill

Abstract

The utility model discloses a tungsten steel step type inner hole drill bit, including drill handle, drill body and setting cutting portion in front of drill body, the drill handle is used for with lathe main shaft connection, the drill body is the main body support structure of drill bit, its inside is equipped with cooling channel, the cutting portion includes fixed cutting tool bit and movable cutting tool bit, the fixed cutting tool bit fixed mounting is in the top of drill body, the movable cutting tool bit movable mounting is in the inside of drill body, the inside of drill body is provided with movable slot for installing movable cutting tool bit, is connected with tool bit removal control subassembly on movable cutting tool bit, tool bit removal control subassembly drives movable cutting tool bit and moves in movable slot radial movable to adjust cutting diameter. The utility model has realized to the one -time processing of step type inner hole, need not multiple replacement different specifications' tool, has greatly simplified the operation process, has improved processing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of internal drilling tools, specifically a tungsten carbide stepped internal drilling tool. Background Technology

[0002] In machining processes, the demand for workpieces with stepped internal holes is increasing. Traditional internal drilling tools often have many shortcomings when machining such stepped internal holes. For example, ordinary drill bits require multiple changes of different specifications to complete the machining of stepped holes, which is cumbersome, inefficient, and prone to cumulative errors due to multiple clamping and positioning, making it difficult to guarantee the dimensional accuracy and coaxiality of different parts of the stepped hole. At the same time, the tool wears out quickly during machining, especially when machining materials with high hardness. Frequent tool changes not only increase machining costs but also affect production schedules. Utility Model Content

[0003] The purpose of this invention is to provide a tungsten carbide stepped internal drilling tool to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a tungsten steel stepped internal drilling tool, comprising a drill shank, a drill body, and a cutting section disposed in front of the drill body. The drill shank is used to connect to a machine tool spindle. The drill body is the main support structure of the drilling tool and has a cooling channel inside. The cutting section includes a fixed cutting head and a movable cutting head. The fixed cutting head is fixedly installed at the top of the drill body, and the movable cutting head is movably installed inside the drill body. The drill body has a movable groove for installing the movable cutting head. A cutting head movement control component is connected to the movable cutting head, and the cutting head movement control component drives the movable cutting head to move radially within the movable groove to adjust the cutting diameter.

[0005] Preferably, the cutter head movement control assembly includes a hydraulic cylinder, a transmission rod, and a sliding block. A fixed seat is installed inside the drill body, and the hydraulic cylinder is fixedly installed on the fixed seat. The bottom of the hydraulic cylinder is connected to the transmission rod through a piston rod. The transmission rod is movably hinged to the piston rod, and the other end of the transmission rod is connected to the sliding block.

[0006] Preferably, a limiting seat is fixedly installed on the top of the sliding block, and the transmission rod is movably hinged to the limiting seat.

[0007] Preferably, the drill body has two limiting blocks fixedly disposed inside, which cooperate with the limiting seat, and the limiting seat is slidably connected between the two limiting blocks.

[0008] Preferably, the movable cutting head is fixedly mounted on one side of the sliding block, and the movable cutting head and the sliding block are detachably connected by screws.

[0009] Preferably, a plug-in block is fixedly installed on one side of the sliding block, and the interior of the movable cutting head is provided with a plug-in hole that cooperates with the plug-in block.

[0010] Preferably, a guide block is fixedly installed at the bottom of the movable groove, and a guide groove that cooperates with the guide block is opened at the bottom of the movable cutting head and the sliding block.

[0011] Preferably, both the drill body and the cutting part are made of tungsten steel.

[0012] Preferably, the end of the drill shank away from the cutting head is provided with a mounting part for use with the connection end of the external machine tool spindle. The mounting part includes a positioning ring, a locking thread section disposed on the inner circumference of the positioning ring, and an elastic part disposed on the free end face of the positioning ring. The positioning ring is locked with the locking member of the external machine tool spindle via the locking thread section. The elastic part abuts against the locking member of the external machine tool spindle and generates elastic deformation, using its rebound force to form an axial preload.

[0013] Preferably, a filter screen is provided at the inlet of the cooling channel. The filter screen is detachably installed on the outer wall of the drill body and is used to filter impurities in the coolant entering the cooling channel.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model, through the design of a movable cutting head and its coordination with a cutting head movement control component, enables one-time machining of stepped internal holes, eliminating the need for multiple changes of different specifications of cutting tools, greatly simplifying the operation process and improving machining efficiency. Simultaneously, by reducing the number of clamping and positioning operations, it effectively avoids the accumulation of errors, ensuring the high requirements for dimensional accuracy and coaxiality of each part of the stepped hole.

[0016] 2. The detachable connection design between the sliding block and the movable cutting head in this utility model not only facilitates the replacement of worn cutting heads but also allows for adjustment of the cutting head type and specifications according to different processing requirements. The drill body and cutting section are made of tungsten steel, a choice that not only improves the wear resistance and hardness of the tool but also ensures the stability and lifespan of the tool during processing, reducing the frequency and cost of tool replacement. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the working structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the connection structure of the movable cutting head of this utility model.

[0020] In the diagram: 1. Drill shank; 2. Drill body; 3. Cutting section; 4. Cooling channel; 5. Fixed cutting head; 6. Movable cutting head; 7. Movable groove; 8. Hydraulic cylinder; 9. Transmission rod; 10. Sliding block; 11. Fixed seat; 12. Limit seat; 13. Limit block; 14. Screw; 15. Insertion block; 16. Insertion hole; 17. Guide block; 18. Guide groove; 100. Mounting part; 101. Positioning ring; 102. Elastic part; 200. Filter screen. 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.

[0022] Please see Figure 1-3 This utility model provides a tungsten carbide stepped internal drilling tool technical solution: it includes a drill shank 1, a drill body 2, and a cutting part 3 disposed in front of the drill body 2. The drill shank 1 is used to connect to the machine tool spindle. The drill body 2 is the main support structure of the drill tool and has a cooling channel 4 inside. The cutting part 3 includes a fixed cutting head 5 and a movable cutting head 6. The fixed cutting head 5 is fixedly installed on the top of the drill body 2, and the movable cutting head 6 is movably installed inside the drill body 2. The drill body 2 has a movable groove 7 for installing the movable cutting head 6. A cutting head movement control component is connected to the movable cutting head 6. The cutting head movement control component drives the movable cutting head to move radially within the movable groove 7 to adjust the cutting diameter.

[0023] Furthermore, the cutter head movement control assembly includes a hydraulic cylinder 8, a transmission rod 9, and a sliding block 10. A fixed seat 11 is installed inside the drill body 2. The hydraulic cylinder 8 is fixedly installed on the fixed seat 11. The bottom of the hydraulic cylinder 8 is connected to the transmission rod 9 through a piston rod. The transmission rod 9 is movably hinged to the piston rod. The other end of the transmission rod 9 is connected to the sliding block 10.

[0024] Furthermore, a limiting seat 12 is fixedly installed on the top of the sliding block 10, and the transmission rod 9 is movably hinged to the limiting seat 12.

[0025] In this embodiment, when the hydraulic cylinder 8 is working, the piston rod pushes the transmission rod 9 to move. One end of the transmission rod 9 rotates around the hinge point under the constraint of the limiting seat 12, thereby driving the sliding block 10 to slide left and right in the movable groove 7. This design allows the movable cutting head 6 to be adjusted left and right as needed during drilling, enhancing the adaptability and flexibility of the drill bit and improving drilling efficiency and accuracy.

[0026] Furthermore, the drill body 2 is internally fixedly provided with two limiting blocks 13 that cooperate with the limiting seat 12, and the limiting seat 12 is slidably connected between the two limiting blocks 13.

[0027] In this embodiment, the two limiting blocks 13 effectively restrict the sliding range of the limiting seat 12, thereby ensuring the stable movement of the movable cutting head 6 within the drill body 2 and avoiding structural damage or poor cutting performance caused by excessive movement. Simultaneously, this limiting design also improves the overall rigidity and stability of the drill bit, enabling it to better resist cutting forces and vibrations during cutting, thus extending the service life of the drill bit.

[0028] Furthermore, the movable cutting head 6 is fixedly installed on one side of the sliding block 10, and the movable cutting head 6 and the sliding block 10 are detachably connected by screws 14.

[0029] Furthermore, a plug-in block 15 is fixedly installed on one side of the sliding block 10, and the interior of the movable cutting head 6 is provided with a plug-in hole 16 that cooperates with the plug-in block 15.

[0030] In this embodiment, the insertion block 15 and insertion hole 16 make the connection between the movable cutting head 6 and the sliding block 10 more stable and facilitate disassembly and replacement. When it is necessary to replace the movable cutting head 6, simply loosen the screw 14, remove the movable cutting head 6 from the sliding block 10, install the new movable cutting head 6 onto the sliding block 10 through the engagement of the insertion block 15 and insertion hole 16, and fix it with the screw 14. The operation is simple and quick, greatly improving work efficiency.

[0031] Furthermore, a guide block 17 is fixedly installed at the bottom of the movable groove 7, and a guide groove 18 that cooperates with the guide block 17 is opened at the bottom of the movable cutting head 6 and the sliding block 10.

[0032] In this embodiment, the guide block 17 guides the movement of the movable cutting head 6 and the sliding block 10, ensuring their stability and accuracy during movement. The guide groove 18 fits tightly with the guide block 17, effectively preventing the movable cutting head 6 from shifting or wobbling during cutting, thereby improving cutting accuracy and machining quality.

[0033] Furthermore, both the drill body 2 and the cutting part 3 are made of tungsten steel.

[0034] In this embodiment, the drill body 2 and the cutting part 3 have high hardness and good wear resistance, which can significantly improve the service life of the drill bit. At the same time, the tungsten steel material also has good thermal stability and corrosion resistance, making the drill bit less prone to deformation and damage during long-term use.

[0035] Working Principle: During operation, the operator first connects the drill shank 1 to the machine tool spindle, then starts the machine tool. The machine tool rotates the drill shank 1 and drill body 2, which in turn drives the cutting part 3 to drill the workpiece. When machining different diameter sections of the stepped inner hole, the operator controls the extension and retraction of the hydraulic cylinder 8. The piston rod of the hydraulic cylinder 8 pushes the transmission rod 9 to move. The transmission rod 9, through the limit seat 12, drives the sliding block 10 to slide between the limit blocks 13, thereby driving the movable cutting head 6 to move left and right within the movable groove 7, achieving position adjustment of the movable cutting head 6. By adjusting the position of the movable cutting head 6, machining of stepped inner holes of different diameters can be achieved without frequently changing different specifications of tools, greatly improving machining efficiency. Simultaneously, since the movable cutting head 6 and the sliding block 10 are detachably connected by screws 14, it facilitates the replacement and maintenance of the movable cutting head 6. Furthermore, the cooling channel 4 inside the drill body 2 can be circulated with coolant to cool the cutting part 3, effectively extending the tool's service life.

[0036] Furthermore, the drill shank 1 is provided with a mounting part 100 for use in conjunction with the connection end of the external machine tool spindle. The mounting part 100 includes a positioning ring 101, a locking thread section disposed on the inner circumference of the positioning ring 101, and an elastic part 102 disposed on the free end face of the positioning ring 101. The positioning ring 101 is locked with the locking member of the external machine tool spindle via the locking thread section. The elastic part 102 abuts against the locking member of the external machine tool spindle and generates elastic deformation, using its rebound force to form an axial preload.

[0037] The positioning ring 101 is machined to ensure its dimensional accuracy matches the installation requirements of the machine tool spindle, guaranteeing accurate mounting of the drill bit onto the spindle. A locking thread section is precisely set on the inner circumference of the positioning ring 101 using a specific machining process (such as thread turning). The specifications of this locking thread section (such as pitch and thread profile) must match the threads on the locking components of the external machine tool spindle to achieve a reliable threaded connection. An elastic part 102 is machined on the free end face of the positioning ring 101. The elastic part 102 can be made of a material with a certain degree of elasticity (such as spring steel) and formed into a specific shape (such as wavy or arc-shaped) through processes such as stamping or forging to provide sufficient elastic deformation capacity. When the drill bit is mounted onto the machine tool spindle, the positioning ring 101 is aligned with the mounting position on the machine tool spindle. By rotating the positioning ring 101, the locking thread section on the inner circumference of the positioning ring 101 engages with the threads on the locking components of the machine tool spindle, achieving a preliminary locking connection between the drill bit and the machine tool spindle. During this process, the elastic part 102 will come into contact with the locking part of the machine tool spindle. As the locking proceeds, the elastic part 102 undergoes elastic deformation and generates a rebound force. This rebound force forms an axial preload, which further enhances the firmness and stability of the connection between the drill bit and the machine tool spindle, effectively preventing the drill bit from loosening due to vibration or other reasons during operation, and ensuring machining accuracy and safety.

[0038] Furthermore, a filter screen 200 is provided at the inlet of the cooling channel 4. The filter screen 200 is detachably installed on the outer wall of the drill body 2 and is used to filter impurities in the coolant entering the cooling channel 4.

[0039] On the outer wall of the drill body 2, corresponding to the inlet of the cooling channel 4, a structure for installing the filter screen 200 is designed and machined. For example, a mounting base with a slot or thread can be provided on the outer wall of the drill body 2. The filter screen 200 is installed on the mounting structure on the outer wall of the drill body 2 via a detachable connection. For example, if a snap-fit ​​connection is used, the edge of the filter screen 200 is designed to match the slot of the mounting base, and the filter screen 200 is directly snapped into the slot for installation; or a threaded connection is used, with a threaded structure on the outer periphery of the filter screen 200, which engages with the thread on the mounting base.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tungsten carbide stepped internal drilling tool, comprising a drill shank (1), a drill body (2), and a cutting section (3) disposed in front of the drill body (2), characterized in that: The drill shank (1) is used to connect to the machine tool spindle. The drill body (2) is the main support structure of the drill bit, and a cooling channel (4) is provided inside. The cutting part (3) includes a fixed cutting head (5) and a movable cutting head (6). The fixed cutting head (5) is fixedly installed at the top of the drill body (2), and the movable cutting head (6) is movably installed inside the drill body (2). The drill body (2) is provided with a movable groove (7) for installing the movable cutting head (6). A cutting head movement control component is connected to the movable cutting head (6). The cutting head movement control component drives the movable cutting head (6) to move radially in the movable groove (7) to adjust the cutting diameter.

2. The tungsten carbide stepped internal drilling tool according to claim 1, characterized in that: The cutting head movement control assembly includes a hydraulic cylinder (8), a transmission rod (9), and a sliding block (10). A fixed seat (11) is installed inside the drill body (2). The hydraulic cylinder (8) is fixedly installed on the fixed seat (11). The bottom of the hydraulic cylinder (8) is connected to the transmission rod (9) through a piston rod. The transmission rod (9) is movably hinged to the piston rod. The other end of the transmission rod (9) is connected to the sliding block (10).

3. The tungsten carbide stepped internal drilling tool according to claim 2, characterized in that: The top of the sliding block (10) is fixedly installed with a limiting seat (12), and the transmission rod (9) is movably hinged to the limiting seat (12).

4. The tungsten carbide stepped internal drilling tool according to claim 3, characterized in that: The drill body (2) is internally fixed with two limiting blocks (13) that cooperate with the limiting seat (12), and the limiting seat (12) is slidably connected between the two limiting blocks (13).

5. A tungsten carbide stepped internal drilling tool according to claim 4, characterized in that: The movable cutting head (6) is fixedly installed on one side of the sliding block (10), and the movable cutting head (6) and the sliding block (10) are detachably connected by screws (14).

6. A tungsten carbide stepped internal drilling tool according to claim 5, characterized in that: A plug-in block (15) is fixedly installed on one side of the sliding block (10), and the interior of the movable cutting head (6) is provided with a plug-in hole (16) that cooperates with the plug-in block (15).

7. A tungsten carbide stepped internal drilling tool according to claim 6, characterized in that: A guide block (17) is fixedly installed at the bottom of the movable groove (7), and a guide groove (18) that cooperates with the guide block (17) is opened at the bottom of the movable cutting head (6) and the sliding block (10).

8. A tungsten carbide stepped internal drilling tool according to claim 1, characterized in that: Both the drill body (2) and the cutting part (3) are made of tungsten steel.

9. A tungsten carbide stepped internal drilling tool according to claim 1, characterized in that: The drill shank (1) has a mounting part (100) at the end away from the cutting head, which is used to cooperate with the connection end of the external machine tool spindle. The mounting part (100) includes a positioning ring (101), a locking thread section disposed on the inner circumference of the positioning ring (101), and an elastic part (102) disposed on the free end face of the positioning ring (101). The positioning ring (101) is locked to the locking member of the external machine tool spindle via the locking thread section. The elastic part (102) abuts against the locking member of the external machine tool spindle and generates elastic deformation, using its rebound force to form an axial preload.

10. A tungsten carbide stepped internal drilling tool according to claim 1, characterized in that: A filter screen (200) is provided at the entrance of the cooling channel (4). The filter screen (200) is detachably installed on the outer wall of the drill body (2) to filter impurities in the coolant entering the cooling channel (4).

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