A shell drill and a shell drilling machine

Abstract

The application relates to the technical field of cutting tools, and particularly discloses a bushing drill bit and a bushing drilling machine. The bushing drill bit comprises a seat body, a handle body and a cooling channel. The seat body is provided with a blade. The cooling channel comprises a liquid inlet channel, at least two connecting channels and at least two liquid outlet channels. A first liquid inlet end of the liquid inlet channel is arranged at a second end of the handle body. The liquid inlet channel penetrates the handle body and the seat body along the axial direction of the handle body. A first liquid outlet end is communicated to a containing groove. A first connecting end of the connecting channel is communicated to the liquid inlet channel. A second liquid inlet end of the liquid outlet channel is communicated to the corresponding connecting channel. A second liquid outlet end is directed to the corresponding blade. The cooling liquid flows through the liquid inlet channel, the connecting channel and the liquid outlet channel in the bushing drill bit, so that the internal cooling of the bushing drill bit is realized. After the cooling liquid flows out of the seat body, the cooling liquid can be precisely sprayed to the cutting edge of the blade, the cutting temperature is effectively reduced, the cutting chip is washed, and the cutting efficiency and machining quality are improved.

Description

Technical Field

[0001] This application relates to the field of cutting tool technology, and in particular to a nesting drill bit and a nesting drill machine. Background Technology

[0002] As a specialized tool for machining hole structures using a ring cutting method, the core-insertion drill bit has been widely used in many core fields such as machinery manufacturing, petrochemicals, aerospace, and sapphire seed crystal processing due to its significant advantages of retaining the intermediate core during machining, saving raw materials, and requiring less machine tool power and having higher cutting efficiency compared to integral drill bits.

[0003] As manufacturing demands for processing efficiency continue to rise, high-power machining is increasingly being used in nesting and drilling operations. However, high-power machining causes the cutting energy to increase exponentially per unit time, resulting in intense friction during tool cutting and a rapid accumulation of cutting heat. If cooling is not timely, this can lead to deterioration of the drill bit's cutting edge material, accelerating tool wear and shortening tool life. In high-power, long-cycle operations, frequent tool changes not only increase production costs but also disrupt the machining process. Utility Model Content

[0004] To address the aforementioned problems, this application provides a nesting drill bit and a nesting drill machine.

[0005] To achieve the above objectives, this application adopts the following technical solution: According to one aspect of this application, a nesting drill bit is provided, comprising a base body, a shank body, and a cooling channel. One end of the base body has a receiving groove, and the other end of the base body is connected to a first end of the shank body. At least two sets of cutting tools are disposed on the base body, with each cutting tool evenly spaced circumferentially around the base body. The cooling channel includes: The liquid inlet channel has a first liquid inlet end and a first liquid outlet end at its two ends. The first liquid inlet end is located at the second end of the handle body. The liquid inlet channel passes through the handle body and the base body along the axial direction of the handle body. The first liquid outlet end is connected to the receiving groove. At least two connection channels are provided, each connection channel corresponding to each blade. The two ends of each connection channel are a first connection end and a second connection end, respectively. The first connection end is connected to the liquid inlet channel, and the second connection end is formed on the outer wall surface of the base. At least two liquid outlet channels are provided, each liquid outlet channel corresponding to each of the connecting channels. The two ends of each liquid outlet channel are a second liquid inlet and a second liquid outlet, respectively. The second liquid inlet is connected to the corresponding connecting channel, and the second liquid outlet faces the corresponding blade.

[0006] In one embodiment, the base is provided with at least two chip grooves, which penetrate the base along the axial direction of the base and each chip groove corresponds to each blade; the chip groove includes a connected mounting surface and a chip-receiving surface, the mounting surface extends radially along the base and the chip-receiving surface is inclined. A mounting groove is provided on the mounting surface, and a clamp is provided in the mounting groove. The blade is assembled in the clamp. A chip removal groove is provided on the side of the chip receiving surface that is connected to the mounting surface. The chip removal groove passes through the chip receiving surface along the axial direction of the base body and communicates with the receiving groove.

[0007] In one embodiment, the liquid outlet channel includes a first liquid outlet channel and a second liquid outlet channel that are connected to each other. The first liquid outlet channel extends along the axial direction of the base body. One end of the first liquid outlet channel away from the second liquid outlet channel is a second liquid inlet end, which is used to communicate with the connecting channel. The other end of the first liquid outlet channel penetrates through the top surface of the base body. The second liquid outlet channel is a groove formed on the top surface. One end of the groove is connected to the other end of the first liquid outlet channel, and the other end of the groove is the second liquid outlet end, which is oriented towards the corresponding blade.

[0008] In one embodiment, the length of the second liquid outlet channel in the circumferential direction of the seat body is 1 to 1.2 times the length of the chip removal groove in the circumferential direction of the seat body.

[0009] In one embodiment, the second liquid outlet is formed on the mounting surface, and the liquid outlet channel is formed on the base along the tangential direction of the second liquid outlet and communicates with the liquid inlet channel; a nozzle is provided on the second liquid outlet, the nozzle protrudes from the mounting surface and faces the corresponding blade, for spraying coolant onto the blade.

[0010] In one embodiment, the nozzle includes a mounting base and a nozzle disposed on the mounting base, and the liquid outlet channel includes a liquid outlet connecting channel and a liquid outlet mounting channel connected together. The end of the liquid outlet connecting channel away from the liquid outlet mounting channel is the second liquid inlet end, which is used to communicate with the connecting channel. The liquid outlet mounting channel is the second liquid outlet end, used to assemble the mounting base. The diameter of the liquid outlet mounting channel is larger than the diameter of the liquid outlet connecting channel. The nozzle protrudes from the mounting surface and faces the corresponding blade, used to spray coolant onto the blade.

[0011] In one embodiment, the side of the seat away from the handle is used to place the workpiece, the workpiece is located below the seat, the connecting channel is inclined downward, and the second connecting end is located below the first connecting end.

[0012] In one embodiment, the liquid inlet channel includes a liquid inlet connecting channel and a liquid inlet mounting channel connected together, wherein the end of the liquid inlet connecting channel away from the liquid inlet mounting channel is the first liquid inlet end, and the first connecting end is connected to the liquid inlet connecting channel; The liquid inlet installation channel is the first liquid outlet end. The liquid inlet installation channel includes a diameter-expanding part and a flared part that are connected to each other. The diameter-expanding part is connected to the liquid inlet communication channel, and the diameter of the diameter-expanding part is larger than the diameter of the liquid inlet communication channel. The liquid inlet installation channel is detachably provided with a liquid inlet sealing component, or the liquid inlet sealing component is provided in the liquid inlet channel to open or close the liquid inlet installation channel.

[0013] In one embodiment, a connecting plug is provided on the second connecting end, and the connecting plug is welded and fixed to the base; or the connecting plug is detachably provided on the base.

[0014] According to another aspect of this application, a nesting drill is also provided, including a spindle and the aforementioned nesting drill bit, wherein the shank of the nesting drill bit is connected to the spindle via an assembly assembly.

[0015] According to the nesting drill bit and nesting drill machine provided in the embodiments of this application, the coolant circulates inside the nesting drill bit through the inlet channel, the connecting channel and the outlet channel to achieve internal cooling of the nesting drill bit. After the coolant flows out from the base, it can be accurately sprayed onto the cutting edge of the insert, effectively reducing the cutting temperature, flushing away chips, and improving cutting efficiency and machining quality. Attached Figure Description

[0016] Figure 1 This illustration shows a structural schematic diagram of a nesting drill bit provided in an embodiment of this application; Figure 2 This image shows a perspective view of a nesting drill bit provided in an embodiment of this application; Figure 3 Show Figure 1 The main view; Figure 4 Show Figure 3 A cross-sectional view along the AA direction; Figure 5 Show Figure 1 Top view; Figure 6 This illustration shows a structural schematic diagram of a nesting drill bit according to another embodiment of this application; Figure 7 A perspective view of a nesting drill bit provided in another embodiment of this application is shown; Figure 8This illustration shows a structural schematic diagram of a nesting drill bit according to another embodiment of this application; Figure 9 Show Figure 8 The main view; Figure 10 Show Figure 9 Cross-sectional view along the BB direction; Figure 11 Show Figure 9 A cross-sectional view along the CC direction.

[0017] Explanation of reference numerals in the attached figures: 1. Base; 11. Receiving groove; 12. Chip groove; 121. Mounting surface; 122. Chip receiving surface; 13. Chip discharge groove; 14. Outer wall surface; 15. Top surface; 2. Handle; 21. First end; 22. Second end; 3. Cooling channel; 31. Liquid inlet channel; 311. First liquid inlet end; 312. First liquid outlet end; 313. Liquid inlet connecting channel; 314. Liquid inlet installation channel; 3141. Expanded diameter section; 3142. Flared opening section; 32. Connecting channel; 321. First connecting end; 322. Second connecting end; 33. Liquid outlet channel; 331. Second liquid inlet end; 332. Second liquid outlet end; 333. First liquid outlet channel; 334. Second liquid outlet channel; 4. Blade; 5. Clamp; 6. Nozzle. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0019] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show the components related to this utility model and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0020] The structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0021] The orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "middle," "longitudinal," "transverse," "horizontal," "inner," "outer," "radial," and "circumferential" used in this specification are based on the orientations or positional relationships shown in the accompanying drawings and are only for the purpose of simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] like Figures 1-8 As shown, this embodiment provides a nesting drill bit, including a base body 1, a shank body 2 and a cooling channel 3. One end of the base body 1 is provided with a receiving groove 11, and the other end of the base body 1 is connected to the first end 21 of the shank body 2. At least two sets of cutting blades 4 are provided on the base body 1, and each cutting blade 4 is evenly spaced around the circumference of the base body 1.

[0023] The receiving groove 11 is used to receive the core material generated during the nesting process, and the shank 2 is used to connect with the spindle of the nesting drill and transmit torque. At least two sets of cutting blades 4 are evenly spaced around the base 1. Each set of cutting blades 4 shares the force during the cutting process, which improves the balance and stability of the cutting process, while dispersing the load of a single cutting point and helping to extend the service life of the cutting blades 4.

[0024] The cooling channel 3 is used to transport coolant. The cooling channel 3 includes an inlet channel 31, at least two connecting channels 32, and at least two outlet channels 33. The inlet channel 31 has a first inlet end 311 and a first outlet end 312 at its two ends. The first inlet end 311 is located at the second end 22 of the handle 2. The inlet channel 31 passes through the handle 2 and the base 1 along the axial direction of the handle 2. The first outlet end 312 is connected to the receiving groove 11.

[0025] Each of the connecting channels 32 corresponds to each of the blades 4. The two ends of each connecting channel 32 are a first connecting end 321 and a second connecting end 322, respectively. The first connecting end 321 is connected to the liquid inlet channel 31, and the second connecting end 322 is formed on the outer wall surface 14 of the base 1. Here, the outer wall surface 14 of the base 1 refers to the outer circumferential cylindrical surface of the base 1.

[0026] Each of the liquid outlet channels 33 corresponds to each of the connecting channels 32. The two ends of the liquid outlet channel 33 are a second liquid inlet 331 and a second liquid outlet 332, respectively. The second liquid inlet 331 is connected to the corresponding connecting channel 32, and the second liquid outlet 332 faces the corresponding blade 4.

[0027] Coolant can be directly injected from the second end 22 of the shank 2 and flows axially through the entire interior of the drill bit, finally entering the receiving groove 11 to cool and lubricate the core, reducing the risk of core adhesion to the inner wall of the drill bit. By setting multiple independent connecting channels 32, the coolant in the inlet channel 31 can be distributed to the corresponding positions of each cutting tool 4, ensuring that each cutting point receives sufficient coolant supply and avoiding wear or failure of the cutting tool 4 due to localized overheating. The outlet channel 33 allows the coolant to flow out from the base 1 after circulating inside the shank 2 and the base 1, and can be precisely sprayed onto the cutting edge of the cutting tool 4, effectively reducing cutting temperature, flushing away chips, and improving cutting efficiency and machining quality. This solves the problem of high production costs caused by insufficient cooling of the cutting tool 4 in existing nesting drill bits during high-power machining modes, leading to high production costs.

[0028] The liquid inlet channel 31 is located in the middle of the handle 2, which can ensure the overall structural strength of the handle 2 and ensure the uniform distribution of coolant.

[0029] like Figures 1-5 As shown, in some embodiments, the base 1 has at least two chip-receiving grooves 12, which extend through the base 1 along its axial direction. Each chip-receiving groove 12 corresponds to each blade 4. Each chip-receiving groove 12 includes a connected mounting surface 121 and a chip-receiving surface 122. The mounting surface 121 extends radially along the base 1, and the chip-receiving surface 122 is inclined. A mounting groove is formed on the mounting surface 121, and a clamp 5 is disposed within the mounting groove. The blade 4 is assembled within the clamp 5. A chip-removing groove 13 is formed on the side of the chip-receiving surface 122 that connects to the mounting surface 121. The chip-removing groove 13 extends through the chip-receiving surface 122 along its axial direction and connects to the receiving groove 11. The blade 4 is fixed in the clamp 5, which provides a mounting position for the blade 4. Optionally, the blade 4 can be detachably mounted in the clamp 5 using bolts or screws, facilitating replacement of the blade 4 after wear. A chip removal groove 13 is provided on the side of the chip-receiving surface 122 that connects to the mounting surface 121. The chip removal groove 13 passes through the chip-receiving surface 122 along the axial direction of the base 1 and connects to the receiving groove 11. The chips generated during the cutting process can enter the receiving groove 11 through the chip removal groove 13, effectively preventing the blockage problem caused by chip accumulation.

[0030] The chip-receiving surface 122 has an inclination angle of 70 to 110 degrees relative to the mounting surface 121. A smaller inclination angle results in a smaller volume of the chip groove 12, thus limiting chip curling and discharge, and increasing the risk of chip clogging. Conversely, a larger inclination angle reduces the wrapping and support of the blade 4, making it difficult to ensure the stability of the blade 4 under high impact. Preferably, the inclination angle of the chip-receiving surface 122 relative to the mounting surface 121 is 80 to 95 degrees.

[0031] like Figures 1-5 As shown, in some embodiments, the liquid outlet channel 33 includes a first liquid outlet channel 333 and a second liquid outlet channel 334 that are connected. The first liquid outlet channel 333 extends along the axial direction of the base 1. One end of the first liquid outlet channel 333 away from the second liquid outlet channel 334 is a second liquid inlet end 331, which is used to communicate with the connecting channel 32. The other end of the first liquid outlet channel 333 penetrates the top surface 15 of the base 1, where the top surface 15 of the base 1 refers to the end face of the base 1 away from the handle 2. The second liquid outlet channel 334 is a through groove formed on the top surface 15. One end of the through groove is connected to the other end of the first liquid outlet channel 333, and the other end of the through groove is a second liquid outlet end 332, which is positioned towards the corresponding blade 4.

[0032] The first coolant outlet channel 333 extends to the top surface 15 of the base 1 and connects with the second coolant outlet channel 334. This allows the coolant in the base 1 to be discharged through the first coolant outlet channel 333. During drill bit machining, the coolant flows along the extension direction of the second coolant outlet channel 334 as the drill bit rotates, and after being discharged from the second coolant outlet channel 334, it is sprayed onto the cutting tool 4 by rotational inertia, thus achieving cooling. The through-groove structure of the second coolant outlet channel 334 expands the coverage area of ​​the coolant, allowing the coolant to evenly cover the cutting area of ​​the cutting tool 4, improving cooling efficiency and chip flushing effect.

[0033] Furthermore, the length of the second liquid outlet channel 334 in the circumferential direction of the seat body is 1 to 1.2 times the length of the chip removal groove 13 in the circumferential direction of the seat body. That is, the length of the second liquid outlet channel 334 in the circumferential direction of the seat body can be 1, 1.05, 1.1, 1.15, or 1.2 times the length of the chip removal groove 13 in the circumferential direction of the seat body.

[0034] The second coolant outlet channel 334, the chip removal groove 13, and the blade 4 are arranged sequentially along the circumferential direction of the base 1. By limiting the length of the second coolant outlet channel 334 along the circumferential direction of the base 1, a certain distance is maintained between the second coolant outlet channel 334 and the blade 4. If the distance between the second coolant outlet channel 334 and the blade 4 is too close, it will be difficult to ensure that the coolant accurately covers the cutting edge due to the pressure and speed of the coolant spraying out. This will cause a large amount of coolant to be violently rebounded and splashed away, failing to form a stable, heat-insulating liquid film, thus making it difficult to guarantee the cooling effect. In addition, if the coolant outlet is too close to the blade 4 and directly faces the chip flow, the strong liquid flow may scatter or flush back the chips discharged from the chip removal groove 13, disrupting the curling and flow path of the chips and causing the chips to clog near the blade 4.

[0035] Of course, if the distance between the second outlet channel 334 and the blade 4 is too far, the coolant will rub against the air, existing chips and workpiece surface after being sprayed and before reaching the cutting point, resulting in pressure decay and speed reduction, which will affect the cooling effect.

[0036] like Figures 6-11 As shown, in some embodiments, the second liquid outlet end 332 is formed on the mounting surface 121, and the liquid outlet channel 33 is formed on the base 1 along the tangential direction of the second liquid outlet end 332 and communicates with the liquid inlet channel 31; a nozzle 6 is provided on the second liquid outlet end 332, the nozzle 6 protrudes from the mounting surface 121 and faces the corresponding blade 4, for spraying coolant onto the blade 4. The arrangement of the nozzle 6 can ensure the spray direction, spray speed and spray area of ​​the coolant, thereby enhancing the cooling and lubrication effect on the cutting edge of the blade 4.

[0037] In some embodiments, the nozzle 6 includes a mounting base and a nozzle disposed on the mounting base. The liquid outlet channel 33 includes a liquid outlet connecting channel and a liquid outlet mounting channel that are connected together. The end of the liquid outlet connecting channel away from the liquid outlet mounting channel is the second liquid inlet end 331, which is used to communicate with the connecting channel 32. The liquid outlet mounting channel is the second liquid outlet end 332, which is used to assemble the mounting base. The diameter of the liquid outlet mounting channel is larger than the diameter of the liquid outlet connecting channel. The nozzle protrudes from the mounting surface 121 and faces the corresponding blade 4, and is used to spray coolant onto the blade 4. By making the diameter of the liquid outlet mounting channel larger than the diameter of the liquid outlet connecting channel, the mounting base can be positioned, facilitating installation and fixation, and ensuring the flow rate of coolant. The nozzle protruding from the mounting surface 121 and facing the blade 4 can accurately spray coolant to the cutting point at a higher pressure, significantly improving the cooling effect and processing efficiency.

[0038] The spray angle of the nozzle is adjustable and can be manually adjusted and fixed by locking components. Since different cutting blades 4 have different heat generation zones and stress points, adjusting the spray angle can direct the coolant towards the hottest cutting point, maximizing the cooling effect and effectively extending the life of the cutting blade 4.

[0039] Furthermore, the spray pattern of the nozzle can also be adjusted. The spray pattern can be adjusted by a knob inside the nozzle. The spray pattern includes, but is not limited to, columnar jets, fan-shaped mists, and conical mists. Among them, columnar jets have high pressure and high speed, while fan-shaped mists and conical mists have a large coverage area and rapid evaporation and heat absorption.

[0040] Reference Figure 4 and Figure 10 In some embodiments, the side of the base 1 away from the handle 2 is used to place the workpiece, with the workpiece located below the base 1. The connecting channel 32 is inclined downwards, and the second connecting end 322 is located below the first connecting end 321. The inclined arrangement of the connecting channel 32 can promote coolant flow through gravity, reduce flow resistance, and ensure that the coolant can flow smoothly to each outlet channel 33, maintaining a stable coolant supply during long-term processing.

[0041] like Figures 6-11 As shown, in some embodiments, the liquid inlet channel 31 includes a liquid inlet connecting channel 313 and a liquid inlet mounting channel 314 connected together. The end of the liquid inlet connecting channel 313 away from the liquid inlet mounting channel 314 is the first liquid inlet end 311, and the first connecting end 321 is connected to the liquid inlet connecting channel 313. The liquid inlet mounting channel 314 is the first liquid outlet end 312. The liquid inlet mounting channel 314 includes a connected expanding portion 3141 and a flared portion 3142. The expanding portion 3141 is connected to the liquid inlet connecting channel 313, and the diameter of the expanding portion 3141 is larger than the diameter of the liquid inlet connecting channel 313. A liquid inlet sealing element is detachably provided on the liquid inlet mounting channel 314, or the liquid inlet sealing element is provided in the liquid inlet channel 31 to open or close the liquid inlet mounting channel 314.

[0042] The enlarged diameter section 3141 increases the cross-sectional area of ​​the coolant flow, reducing flow velocity loss, while the flared opening 3142 facilitates smooth entry of the coolant into the receiving tank 11. A removable inlet plug is mounted on the inlet installation channel 314, or the inlet plug can be movably mounted within the inlet channel 31 to open or close the inlet installation channel 314. By adjusting the inlet plug, the coolant flow direction can be flexibly controlled according to processing requirements, achieving selective flow of coolant into the receiving tank 11.

[0043] The inlet sealing element can be a flexible plug or a rigid threaded plug, detachably installed on the inlet mounting channel 314. The flexible plug embeds itself into the inlet mounting channel 314 through its elastic deformation and further expands under coolant pressure to achieve a seal. The rigid threaded plug is screwed into the threaded hole of the inlet mounting channel 314 through its threads, and seals are achieved through the engagement of the threads themselves or by a sealing ring or copper gasket at its end. In addition, the inlet sealing element can also be a one-way valve or a regulating valve installed in the inlet channel 31 to open or close the inlet mounting channel 314.

[0044] In some embodiments, by extending the second connecting end 322 through the outer wall surface 14 of the base 1, the fabrication of the connecting channel 32 is facilitated. A connecting sealing member is provided on the second connecting end 322, which is welded and fixed to the base 1. This welding method ensures the sealing of the connecting channel 32, preventing coolant leakage and improving the overall strength and durability of the structure. Alternatively, the connecting sealing member can be detachably mounted on the base 1, and can be a flexible plug or a rigid threaded plug, etc.

[0045] In summary, the coolant in the nesting drill bit provided in this embodiment flows through the inlet channel 31, the connecting channel 32, and the outlet channel 33 to achieve internal cooling of the nesting drill bit. After the coolant flows out from the base 1, it can be accurately sprayed onto the cutting edge of the insert 4, effectively reducing the cutting temperature, flushing away chips, and improving cutting efficiency and machining quality.

[0046] like Figures 1-11 As shown, this embodiment provides a nesting drill, including a spindle and the aforementioned nesting drill bit. The shank 2 of the nesting drill bit is connected to the spindle via an assembly assembly. The assembly assembly includes a side-locked tool holder, a hydraulic tool holder, or a heat-shrink tool holder, etc., to ensure the connection accuracy and mechanical stability between the nesting drill bit and the spindle, enabling the spindle's rotational power to be accurately transmitted to the nesting drill bit, avoiding power loss or vibration during power transmission, and improving machining accuracy.

[0047] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A nesting drill bit, characterized in that, The device includes a base (1), a handle (2), and a cooling channel (3). One end of the base (1) has a receiving groove (11), and the other end of the base (1) is connected to the first end (21) of the handle (2). At least two sets of blades (4) are provided on the base (1), and each blade (4) is evenly spaced around the circumference of the base (1). The cooling channel (3) includes: The liquid inlet channel (31) has a first liquid inlet end (311) and a first liquid outlet end (312) at its two ends. The first liquid inlet end (311) is located at the second end (22) of the handle (2). The liquid inlet channel (31) passes through the handle (2) and the seat (1) along the axial direction of the handle (2). The first liquid outlet end (312) is connected to the receiving groove (11). At least two connecting channels (32), each connecting channel (32) corresponds to each blade (4), and the two ends of the connecting channel (32) are a first connecting end (321) and a second connecting end (322), respectively. The first connecting end (321) is connected to the liquid inlet channel (31), and the second connecting end (322) is opened on the outer wall surface (14) of the seat (1); At least two liquid outlet channels (33) are provided, each of the liquid outlet channels (33) is corresponding to each of the connecting channels (32), and the two ends of the liquid outlet channel (33) are a second liquid inlet (331) and a second liquid outlet (332), respectively. The second liquid inlet (331) is connected to the corresponding connecting channel (32), and the second liquid outlet (332) faces the corresponding blade (4).

2. The nesting drill bit according to claim 1, characterized in that, At least two chip grooves (12) are provided on the base (1). The chip grooves (12) penetrate the base (1) along the axial direction of the base (1). Each chip groove (12) corresponds to each blade (4). The chip groove (12) includes a connected mounting surface (121) and a chip-receiving surface (122). The mounting surface (121) extends radially along the base (1), and the chip-receiving surface (122) is inclined. The mounting surface (121) is provided with a mounting groove, and a clamp (5) is provided in the mounting groove. The blade (4) is assembled in the clamp (5). A chip removal groove (13) is provided on the side of the chip receiving surface (122) that is connected to the mounting surface (121). The chip removal groove (13) passes through the chip receiving surface (122) along the axial direction of the base (1) and connects to the receiving groove (11).

3. The nesting drill bit according to claim 2, characterized in that, The liquid outlet channel (33) includes a first liquid outlet channel (333) and a second liquid outlet channel (334) that are connected. The first liquid outlet channel (333) extends along the axial direction of the seat (1). The end of the first liquid outlet channel (333) away from the second liquid outlet channel (334) is a second liquid inlet (331) for communicating with the connecting channel (32). The other end of the first liquid outlet channel (333) penetrates the top surface (15) of the seat (1). The second liquid outlet channel (334) is a through groove formed on the top surface (15). One end of the through groove is connected to the other end of the first liquid outlet channel (333). The other end of the through groove is the second liquid outlet end (332), which is set towards the corresponding blade (4).

4. The nesting drill bit according to claim 3, characterized in that, The length of the second liquid outlet channel (334) in the circumferential direction of the seat (1) is 1 to 1.2 times the length of the chip removal groove (13) in the circumferential direction of the seat (1).

5. The nesting drill bit according to claim 2, characterized in that, The second liquid outlet end (332) is opened on the mounting surface (121), and the liquid outlet channel (33) is opened on the seat (1) along the tangential direction of the second liquid outlet end (332) and communicates with the liquid inlet channel (31); a nozzle (6) is provided on the second liquid outlet end (332), the nozzle (6) protrudes from the mounting surface (121) and faces the corresponding blade (4) for spraying coolant onto the blade (4).

6. The nesting drill bit according to claim 5, characterized in that, The nozzle (6) includes a mounting base and a nozzle disposed on the mounting base. The liquid outlet channel (33) includes a liquid outlet connection channel and a liquid outlet installation channel connected together. The end of the liquid outlet connection channel away from the liquid outlet installation channel is the second liquid inlet end (331), which is used to communicate with the connection channel (32). The liquid outlet mounting channel is the second liquid outlet end (332), which is used to assemble the mounting base. The diameter of the liquid outlet mounting channel is larger than the diameter of the liquid outlet connecting channel. The nozzle protrudes from the mounting surface (121) and faces the corresponding blade (4), and is used to spray coolant onto the blade (4).

7. The nesting drill bit according to any one of claims 1-6, characterized in that, The side of the seat (1) away from the handle (2) is used to place the workpiece. The workpiece is located below the seat (1). The connecting channel (32) is inclined downward. The second connecting end (322) is located below the first connecting end (321).

8. The casing drill bit according to any one of claims 1-6, characterized in that, The liquid inlet channel (31) includes a liquid inlet connecting channel (313) and a liquid inlet mounting channel (314) connected to each other. The end of the liquid inlet connecting channel (313) away from the liquid inlet mounting channel (314) is the first liquid inlet end (311), and the first connecting end (321) is connected to the liquid inlet connecting channel (313). The liquid inlet installation channel (314) is the first liquid outlet end (312). The liquid inlet installation channel (314) includes a diameter expansion section (3141) and a flared section (3142) that are connected to each other. The diameter expansion section (3141) is connected to the liquid inlet communication channel (313). The diameter of the diameter expansion section (3141) is larger than the diameter of the liquid inlet communication channel (313). The liquid inlet installation channel (314) is detachably provided with a liquid inlet sealing component, or the liquid inlet sealing component is provided in the liquid inlet channel (31) to open or close the liquid inlet installation channel (314).

9. The nesting drill bit according to any one of claims 1-6, characterized in that, The second connecting end (322) is provided with a connecting sealing component, which is welded and fixed to the seat (1); or the connecting sealing component is detachably provided on the seat (1).

10. A nesting drilling rig, characterized in that, Includes a spindle and a nesting drill bit as described in any one of claims 1-9, wherein the shank (2) of the nesting drill bit is connected to the spindle via an assembly assembly.

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