Drill bit and drill bit manufacturing method

Abstract

The invention provides a drill bit and a drill bit manufacturing method, and relates to the technical field of drilling equipment. The drill bit comprises a tubular cutting head; a cutting edge extending in the circumferential direction of the cutting head is arranged at a pipe opening in one side of the cutting head, a first groove body extending to the cutting head is formed in the side, away from the cutting head, of the cutting edge, the first groove body is communicated with the inner space of the cutting head, and the groove width of the first groove body is gradually reduced from a groove opening to the groove bottom of the first groove body. According to the drill bit, the length of a waste chip and cooling liquid discharging channel is effectively prolonged through the first groove body extending to the cutting head, so that waste chips and cooling liquid in the drilling process are more easily discharged after entering the cutting head, and the discharging smoothness of the waste chips and the cooling liquid is improved; and meanwhile, the groove width of the first groove body is gradually reduced from the groove opening to the groove bottom, so that the discharging speed can be gradually increased in the discharging process of the sweeps and the cooling liquid, the discharging smoothness of the sweeps and the cooling liquid is further enhanced, and accumulation of the sweeps is effectively prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling equipment, in particular to a drill bit and a drill bit manufacturing method. Background Art

[0002] As the core component of drilling and high-precision anchor bolt installation drilling equipment, the drill bit is often used in mining, geological exploration, engineering construction and other fields. The performance of the drill bit directly affects the drilling efficiency, operation quality and equipment service life.

[0003] The drill bit generally adopts a modular structure, which includes an independent cutting head and a drill pipe, wherein the cutting head is fixed to one end of the drill pipe by a threaded connection.

[0004] The cutting head is usually provided with a blade at the end away from the drill pipe. In order to allow the waste chips cut off during the drilling process and the coolant used to cool the drill bit to be discharged through the drill pipe, a groove is usually provided on the blade. The waste chips and the coolant used for cooling can enter the drill pipe through the groove and then be discharged to the outside through the drill pipe.

[0005] However, the grooves of existing drill bits often have problems with poor chip discharge and chip accumulation, which not only affects the subsequent cutting efficiency, but also causes the cutting head to overheat and accelerates the wear of the cutting head. At the same time, it also leads to poor coolant discharge effect, affects coolant circulation, and thus affects the cooling effect and service life of the cutting head. Summary of the Invention

[0006] The purpose of the present invention is to provide a drill bit and a drill bit manufacturing method to alleviate the technical problems in the prior art that waste chips are often not discharged smoothly and waste chips accumulate in the grooves on the drill bit blade, which not only affects the subsequent cutting efficiency, but also causes the cutter head to overheat and accelerates cutter head wear. At the same time, it also leads to poor coolant discharge effect, affects coolant circulation, and thus affects the cooling effect and service life of the cutter head.

[0007] In a first aspect, the present invention provides a drill bit comprising a tubular cutting head; A blade extending along its circumference is provided at a pipe mouth on one side of the cutting head, and a first groove body extending to the cutting head is provided on the side of the blade away from the cutting head. The first groove body is connected to the internal space of the cutting head, and the groove width of the first groove body gradually decreases from the groove opening to the groove bottom of the first groove body.

[0008] In an optional embodiment, the first groove body is tilted relative to the central axis of the cutting head, and from the groove opening to the groove bottom of the first groove body, the first groove body is tilted in a direction opposite to the rotation direction of the drill bit when drilling.

[0009] In an optional embodiment, there are multiple first groove bodies, and the multiple first groove bodies are arranged at equal intervals along the circumference of the cutting head.

[0010] In an optional embodiment, a vertical distance between the notch opening and the bottom of the first notch body is equal to 30%-40% of the sum of the heights of the cutting head and the blade in the axial direction of the cutting head.

[0011] In an optional embodiment, a second groove is further provided on a side of the blade away from the cutting head, and a bottom of the second groove is flush with a side of the blade close to the cutting head.

[0012] In an optional embodiment, further comprising a drill pipe; A side of the cutting head away from the blade is welded or integrally formed with one end of the drill pipe, and the cutting head is communicated with the drill pipe.

[0013] In an optional embodiment, at least one annular groove is provided on the drill pipe body near the cutting head, and the annular groove extends along the circumference of the drill pipe.

[0014] In an optional embodiment, there are multiple annular grooves, and the multiple annular grooves are evenly spaced along the axial direction of the drill pipe.

[0015] In an optional embodiment, a casing is further included, which is sleeved and fixed to the outside of the drill pipe away from the cutting head.

[0016] In a second aspect, the present invention provides a drill bit manufacturing method for manufacturing the drill bit according to any one of the aforementioned embodiments, comprising: S1: Add 0.3%~0.8% of wetting agent to the alloy powder base and stir and mix; S2: filling the mixed base material into a graphite mold and sintering it to form a cutting head and blade; S3: Use laser to open a first groove between the blade and the cutting head.

[0017] The drill bit provided by the present invention includes a tubular cutting head; a cutting blade extending circumferentially thereof is provided at one end of the cutting head; a first groove extending into the cutting head is provided on a side of the cutting blade away from the cutting head; the first groove communicates with the interior space of the cutting head, and the groove width of the first groove gradually decreases from the groove opening to the bottom of the groove. The drill bit provided by the present invention can be used on drilling and hole-drilling equipment. During operations such as mining, geological exploration, and construction, the drill bit is driven to rotate by the equipment, thereby drilling into solid objects such as soil, rock formations, and walls. During the drilling process, the cutting blade on the cutting head rotates and cuts the solid object, and the first groove accommodates waste chips generated during the drilling process. In addition, to prevent the drill bit from overheating, a coolant such as water must be continuously supplied to the drill hole during the drilling process, and the cooled coolant must be discharged to form a circulation system. Because the first groove in the present invention is provided on the side of the cutting blade away from the cutting head, the cooled coolant and the waste chips can enter the first groove during the drilling process, then enter the interior of the cutting head and be discharged. Compared to existing drill bits that only have grooves on the cutting edge, the first groove body of the present invention extends to the cutting head, effectively extending the length of the waste chip and coolant discharge channel, thereby improving the smooth discharge of waste chips and coolant, and effectively preventing waste chips from accumulating and affecting cutting efficiency and coolant circulation. In addition, because the groove width of the first groove body gradually decreases from the groove mouth to the groove bottom, the present invention can also gradually increase the discharge speed of waste chips and coolant during the waste chip and coolant discharge process by utilizing the gradually narrowing width of the first groove body, thereby making it easier for waste chips and coolant to enter the interior of the cutting head from the first groove body, effectively preventing waste chips from accumulating in the first groove body, and further improving the smooth discharge of waste chips and coolant.

[0018] Compared with the prior art, the drill bit provided by the present invention effectively extends the length of the waste chip and coolant discharge channel by extending the first groove body to the cutting head, so that the waste chips and coolant in the drilling process are easier to enter the interior of the cutting head and be discharged, thereby improving the discharge smoothness of the waste chips and coolant; at the same time, the groove width of the first groove body gradually decreases from the groove mouth to the groove bottom, which can gradually increase the discharge speed of the waste chips and coolant during the discharge process, thereby further enhancing the discharge smoothness of the waste chips and coolant, and effectively preventing waste chips from accumulating.

[0019] The drill bit manufacturing method provided by the present invention is used to manufacture the aforementioned drill bit, comprising: S1: adding 0.3% to 0.8% of a wetting agent to an alloy powder base material and stirring and mixing the mixture; S2: filling the mixed base material into a graphite mold and sintering the mixture to form a cutting head and a blade; S3: using a laser to create a first groove between the blade and the cutting head. The drill bit manufactured by the drill bit manufacturing method provided by the present invention can also utilize the first groove extending to the cutting head to extend the length of the waste chip and coolant discharge channel, and can also utilize the width variation of the first groove to increase the waste chip and coolant discharge speed, thereby effectively improving the smoothness of waste chip and coolant discharge and preventing waste chip accumulation from affecting cutting efficiency and coolant circulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic structural diagram of a drill bit provided in an embodiment of the present invention; Figure 2 A front view of a drill bit provided in an embodiment of the present invention; Figure 3 Another structural schematic diagram of a drill bit provided by an embodiment of the present invention; Figure 4 This is a flow chart of a drill bit manufacturing method provided in an embodiment of the present invention.

[0022] Icon: 1-cutting head; 2-blade; 3-first groove; 4-second groove; 5-drill pipe; 50-annular groove; 6-casing. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0025] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0026] Example: like Figure 1-Figure 2 As shown, the drill bit provided in this embodiment includes a tubular cutting head 1; a blade 2 extending along its circumference is provided at a tube mouth on one side of the cutting head 1, and a first groove body 3 extending to the cutting head 1 is provided on the side of the blade 2 away from the cutting head 1. The first groove body 3 is connected to the internal space of the cutting head 1, and the groove width of the first groove body 3 gradually decreases from the groove mouth to the groove bottom of the first groove body 3.

[0027] The drill bit provided in this embodiment can be used in drilling equipment, such as drilling equipment. During operations such as mining, geological exploration, and construction, the drill bit is driven by the equipment to rotate, thereby drilling into solid materials such as soil, rock formations, and walls. The cutting head 1 in the drill bit is used to cut the solid during rotation, the blade 2 is used to quickly break the solid surface during the initial cutting process to reduce cutting resistance, and the first trough 3 is used to accommodate waste chips generated during the cutting process.

[0028] In addition, to prevent the drill bit from overheating, water or other coolant must be continuously supplied to the drill hole during the drilling process and the cooled coolant must be discharged to form a circulation. Since the first trough body 3 in this embodiment is opened on the side of the blade 2 away from the cutting head 1, the cooled coolant and the above-mentioned waste chips can enter the first trough body 3 during the drilling process. Since the first trough body 3 is connected to the internal space of the cutting head 1, the waste chips and liquid entering the first trough body 3 can continue to enter the interior of the cutting head 1 and then be discharged.

[0029] Compared with the existing drill bit that only has a groove on the blade, the first groove body 3 in this embodiment extends to the cutting head 1, effectively extending the length of the waste chip and coolant discharge channel, thereby improving the discharge of waste chips and coolant, and effectively preventing waste chips from accumulating and affecting the cutting efficiency and coolant circulation process.

[0030] In addition, since the width of the first groove body 3 gradually decreases from the groove mouth to the groove bottom, this embodiment can also gradually increase the discharge speed of waste chips and coolant during the discharge of waste chips and coolant by utilizing the gradually narrowing width of the first groove body 3, thereby making it easier for waste chips and coolant to enter the interior of the cutting head 1 from the first groove body 3, effectively preventing waste chips from accumulating in the first groove body 3, and further improving the discharge smoothness of waste chips and coolant.

[0031] Compared with the prior art, the drill bit provided in this embodiment effectively extends the length of the waste chip and coolant discharge channel by extending the first groove body 3 to the cutting head 1, so that the waste chips and coolant in the drilling process are easier to enter the interior of the cutting head 1 and then be discharged, thereby improving the discharge smoothness of the waste chips and coolant; at the same time, the groove width of the first groove body 3 gradually decreases from the groove mouth to the groove bottom, which can gradually increase the discharge speed of the waste chips and coolant during the discharge process, thereby further enhancing the discharge smoothness of the waste chips and coolant, and effectively preventing waste chips from accumulating.

[0032] like Figure 2 As shown, the first groove body 3 is tilted relative to the central axis of the cutting head 1, and from the groove opening to the groove bottom of the first groove body 3, the first groove body 3 is tilted in a direction opposite to the rotation direction of the drill bit when drilling.

[0033] Compared with the arrangement in which the first groove body 3 extends along the axial direction of the cutting head 1, the first groove body 3 is inclined in the direction opposite to the rotation direction of the drill bit when drilling, which can effectively enhance the crack resistance of the blade 2 and the cutting head 1 and reduce fatigue damage of the drill bit in the later stage of operation.

[0034] There is no limit to the number of the first tank bodies 3 , and there can be one or more first tank bodies 3 .

[0035] To improve the efficiency of waste chip and coolant discharge, such as Figure 1 As shown, in this embodiment, it is preferred that there are multiple first slots 3 , and the multiple first slots 3 are arranged at equal intervals along the circumference of the cutting head 1 .

[0036] The equal-interval arrangement makes the distribution of the plurality of first trough bodies 3 more uniform, thereby making the discharge process of waste chips and coolant more uniform and smooth.

[0037] There is no limitation on the size of the blade 2 and the cutting head 1. In this embodiment, the axial length of the cutting head 1 can be 12-15 mm. The axial length of the blade 2 in the cutting head 1 can be 1-1.5 mm.

[0038] In addition, there is no limitation on the size of the first groove body 3 , as long as the first groove body 3 can extend from the blade 2 to the body of the cutting head 1 .

[0039] In order to achieve the best discharge effect of waste chips and coolant, in this embodiment, the vertical distance between the groove opening and the groove bottom of the first groove body 3 is preferably equal to 30%-40% of the sum of the axial heights of the cutting head 1 and the blade 2.

[0040] like Figure 1 As shown, a second groove 4 is further provided on the side of the blade 2 away from the cutting head 1 , and the bottom of the second groove 4 is flush with the side of the blade 2 close to the cutting head 1 .

[0041] Waste chips and coolant can also enter the interior of the cutting head 1 through the second groove 4, thereby further improving the efficiency of waste chip and coolant discharge. More importantly, the second groove 4 can improve the cutting effect of the blade 2 on the solid during the drilling process, reduce cutting resistance and improve cutting efficiency.

[0042] In addition, in order to improve the drilling effect and service life of the drill bit, the cutting head 1 and the blade 2 usually need to be coated with diamond particles. Therefore, a second groove 4 and a first groove 3 are opened on the blade 2. The inner wall of the groove can also be used to increase the adhesion area of the diamond particles, thereby further improving the cutting effect of the cutter head on the solid and accelerating the cutting process.

[0043] It should be noted that the coverage area of the diamond particles on the existing drill bit is relatively small. This embodiment effectively increases the depth and inner wall area of the groove body by making the bottom of the second groove body 4 flush with the side of the blade 2 close to the cutting head 1 and providing the first groove body 3, thereby effectively increasing the coverage area of the diamond particles. This not only reduces the wear of the drill bit and extends the service life of the drill bit, but also makes it easier for the drill bit to break through the solid surface when the drill bit cuts high-hardness solids such as rocks, minerals, reinforced concrete, etc., and prevents the drill bit from shaking during feeding.

[0044] It should also be noted that the bottom of the second groove body 4 is flush with the side of the blade 2 close to the cutting head 1, that is, the vertical distance between the groove mouth of the second groove body 4 and the groove bottom is equal to the axial length of the blade 2 in the cutting head 1, which can maximize the effect of the second groove body 4 on improving the cutting smoothness of the blade 2, thereby effectively enhancing the cutting effect of the blade 2 during the drilling process, and at the same time making the discharge process of waste chips and coolant at the second groove body 4 smoother.

[0045] The second groove body 4 may be a U-shaped groove, or there may be multiple second groove bodies 4 , and the multiple second groove bodies 4 are evenly spaced on the blade 2 along the circumference of the cutting head 1 .

[0046] like Figure 1As shown, when there are multiple first groove bodies 3, the multiple first groove bodies 3 and the multiple second groove bodies 4 can be staggered along the circumference of the cutting head 1. This arrangement can make the distribution of the second groove bodies 4 and the first groove bodies 3 more balanced, thereby improving the structural stability and use stability of the drill bit.

[0047] like Figure 3 As shown, the drill bit provided in this embodiment further includes a drill pipe 5 ; a side of the cutting head 1 away from the blade 2 is welded or integrally formed with one end of the drill pipe 5 , and the cutting head 1 is in communication with the drill pipe 5 .

[0048] After entering the cutting head 1, waste chips and coolant can continue to flow toward the drill pipe 5 and then be discharged to the outside through the drill pipe 5. Compared with the prior art method of connecting the cutting head and the drill pipe via threads, the cutting head 1 and the drill pipe 5 in this embodiment are connected to each other by welding or integral molding, which can effectively improve the overall structural strength of the drill bit, thereby improving the load capacity and drilling stability of the drill bit.

[0049] In addition, it should be noted that the threaded connection method is difficult to ensure high-precision coaxiality between the cutting head and the drill pipe 5. This embodiment adopts a welding method to effectively improve the coaxiality between the cutting head 1 and the drill pipe 5, thereby effectively reducing the eccentric vibration of the drill bit during the drilling process, preventing the cutting head 1 and the drill pipe 5 from fatigue damage due to eccentric vibration, and preventing the drilling quality from being affected.

[0050] Specifically, the coaxiality between the cutting head 1 and the drill pipe 5 can be within 0.15 mm.

[0051] There is no limit to the size of the drill pipe 5, and the diameter of the drill pipe 5 can be selected according to different drilling purposes. For example, the diameter of the drill pipe 5 can be 10-50 mm.

[0052] In order to improve the smoothness of the discharge of waste chips and coolant, when the drill pipe 5 and the cutting head 1 are connected by welding, in this embodiment, the inner diameter of the drill pipe 5 is preferably slightly larger than the outer diameter of the cutting head 1 so that the end of the cutting head 1 away from the blade 2 can be sleeved into the drill pipe 5.

[0053] like Figure 3 As shown, at least one annular groove 50 is provided on the drill pipe 5 near the cutting head 1 , and the annular groove 50 extends along the circumference of the drill pipe 5 .

[0054] As mentioned above, in order to prevent the drill bit from overheating during the drilling process, it is necessary to continuously supply water or other coolant to the drill hole. An annular groove 50 is provided on the tube body of the drill pipe 5 near the cutting head 1. The annular groove 50 can be used to extend the residence time of the coolant on the side of the drill pipe 5 and increase the distribution area of the coolant on the side of the drill pipe 5, thereby improving the cooling effect of the coolant on the drill bit, reducing the damage to the drill bit caused by high temperature, and further extending the service life of the drill bit.

[0055] In addition, the annular groove 50 can also make the drill bit structure better adapted to the drilling equipment, thereby improving the installation stability of the drill bit and the drilling equipment.

[0056] Further, such as Figure 3 As shown, there are multiple annular grooves 50 , and the multiple annular grooves 50 are evenly spaced along the axial direction of the drill pipe 5 .

[0057] The multiple annular grooves 50 can expand the residence area of the coolant on the side of the drill pipe 5, and the equally spaced distribution arrangement can make the distribution of the coolant on the side of the drill pipe 5 more uniform, thereby further enhancing the cooling effect of the coolant on the drill bit.

[0058] like Figure 3 As shown, the drill bit provided in this embodiment further includes a sleeve 6 , which is sleeved and fixed to the outside of the drill pipe 5 away from the cutting head 1 .

[0059] The end of the drill pipe 5 away from the cutting head 1 is usually connected to the drilling equipment. A casing 6 is installed outside the pipe body of the drill pipe 5 away from the cutting head 1. The casing 6 can be used to enhance the strength of the connection between the drill pipe 5 and the drilling equipment, so that the drill bit can withstand a higher load and prevent the connection between the drill pipe 5 and the drilling equipment from loosening or breaking due to high load operation.

[0060] In order to enhance the strength-enhancing effect of the casing 6 on the drill bit, in this embodiment, the casing 6 is preferably fixedly connected to the drill pipe 5 by welding or integral molding.

[0061] Furthermore, the outer wall and / or inner wall of the casing 6 may be provided with reinforcing ribs, which are used to improve the structural strength of the casing 6 so that the connection between the drill pipe 5 and the drilling equipment can withstand greater axial and lateral loads.

[0062] To sum up, the drill bit provided in this embodiment effectively improves the initial cutting performance and continuous cutting efficiency of the drill bit by adopting the first groove body 3 and the second groove body 4, while extending the service life of the cutting head 1; by adopting welding and the casing 6, the overall stability and high load capacity of the drill bit are effectively improved.

[0063] like Figure 4 As shown, this embodiment also provides a drill bit manufacturing method, which is used to manufacture the above-mentioned drill bit, comprising: Step S1: adding 0.3% to 0.8% of a wetting agent to the alloy powder base material and stirring and mixing the mixture; Step S2: filling the mixed base material into a graphite mold and sintering it to form the cutting head 1 and the blade 2; Step S3: using laser to open a first groove 3 between the blade 2 and the cutting head 1 .

[0064] The drill bit manufactured by the drill bit manufacturing method provided in this embodiment can also use the first groove body 3 extending to the cutting head 1 to extend the length of the waste chip and coolant discharge channel, and can also use the width change of the first groove body 3 to increase the discharge speed of waste chips and coolant, thereby effectively improving the discharge smoothness of waste chips and coolant, and preventing waste chips from accumulating and affecting the cutting efficiency and the coolant circulation process.

[0065] Among them, the alloy powder base material in step S1 can be steel powder, nickel powder, copper powder, silicon carbide, manganese powder and other powders. There is no restriction on the specific type and ratio of the alloy powder base material, as long as it can meet the drilling requirements and continuous operation requirements of the drill bit.

[0066] It should be noted that the proportion of the wetting agent in step S1 is 0.3% to 0.8%, which can make the alloy powder base material have better adhesion without affecting the structural strength of the drill bit, which is beneficial to the subsequent processing and molding of the alloy powder base material.

[0067] In step S1, the alloy powder and the wetting agent may be fully stirred using a mixing device to ensure that the wetting agent and the alloy powder are fully mixed. In addition, during the stirring process, the humidity must be strictly controlled to prevent the mixture of the alloy powder and the wetting agent from being too dry or too wet, thereby affecting the drill bit forming quality.

[0068] In step S2, since graphite molds have better high temperature resistance and anti-adhesion properties than other existing molds, which is beneficial to improving the drill bit forming accuracy, the mold used in step S2 in this embodiment is preferably a graphite mold.

[0069] Furthermore, in step S2, a feeding device can be used to strictly control the weight and depth of the base material filled into the graphite mold to ensure that the density of the base material in each part of the graphite mold is consistent. After the filling is completed, the surface of the base material can be smoothed to ensure that the filling in the graphite mold is flat and free of gaps.

[0070] Furthermore, in step S2, when sintering the base material in the graphite mold, the filled graphite mold can be placed in a hot press sintering device. The temperature of the hot press sintering device is then controlled within a range of 870-945°C. The sintering time is set based on the properties of the base material, typically 30-60 minutes, before sintering. During the sintering process, the hot press sintering device can also be used to apply uniform pressure (controlled at 80-100 MPa) to ensure the densification of the sintered material, thereby improving the strength of the cutting head 1 and the blade 2.

[0071] After step S2 is completed, the height, appearance and hardness of the sintered first cutting head 1 and blade 2 can be comprehensively tested to ensure that the sintering result meets the design requirements.

[0072] In step S3, the sintered cutting head 1 and blade 2 can be precisely processed using a laser cutting machine, and then a first groove 3 can be opened between the blade 2 and the cutting head 1. When a second groove 4 is also provided at the blade 2, the second groove 4 can also be opened at the same time.

[0073] After completing step S3, it is also possible to check whether the size of the cutting head 1 meets the design requirements, and check whether the slot positions of the first slot body 3 and the second slot body 4 meet the design requirements to ensure the processing accuracy of the drill bit.

[0074] In addition, if Figure 4 As shown, the drill bit manufacturing method provided in this embodiment may further include the following steps after step S3: Step S4: Connect the side of the cutting head 1 away from the blade 2 to one end of the drill pipe 5, and make the coaxiality of the cutting head 1 and the drill pipe 5 within 0.15 mm, and then use high-frequency laser welding equipment to weld and fix the end of the cutting head 1 and the drill pipe 5.

[0075] Among them, the high-frequency laser welding equipment can not only use the laser welding process to effectively improve the connection strength and high-temperature resistance of the connection between the cutting head 1 and the drill pipe 5, but also can strictly control the coaxiality of the cutting head 1 and the drill pipe 5 to within 0.15 mm, thereby effectively ensuring the welding accuracy and stability between the cutting head 1 and the drill pipe 5.

[0076] After completing step S4, the coaxiality and welding strength of the cutting head 1 and the drill pipe 5 can be tested using special tools to ensure that they meet the use requirements.

[0077] In addition, the blade 2 may be sharpened to improve its cutting ability.

[0078] In order to extend the service life of the drill bit, after the drill bit is manufactured, the surface of the drill bit can be painted to enhance its corrosion resistance.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A drill bit, characterized in that: It includes a tubular cutting head (1); A cutting edge (2) extending along the circumference of the cutting head (1) is provided at a pipe opening on one side of the cutting head (1); a first groove (3) extending to the cutting head (1) is provided on a side of the cutting edge (2) away from the cutting head (1); the first groove (3) is communicated with the internal space of the cutting head (1); and the groove width of the first groove (3) gradually decreases from the groove opening to the groove bottom of the first groove (3).

2. The drill bit according to claim 1, characterized in that The first groove body (3) is arranged tilted relative to the central axis of the cutting head (1), and from the groove opening to the groove bottom of the first groove body (3), the first groove body (3) is tilted in a direction opposite to the rotation direction of the drill bit when drilling.

3. The drill bit according to claim 2, characterized in that There are a plurality of first trough bodies (3), and the plurality of first trough bodies (3) are arranged at equal intervals along the circumference of the cutting head (1).

4. The drill bit according to claim 1, wherein The vertical distance between the notch opening and the bottom of the first notch body (3) is equal to 30%-40% of the sum of the heights of the cutting head (1) and the blade (2) in the axial direction of the cutting head (1).

5. The drill bit according to claim 1, wherein A second groove (4) is further provided on the side of the blade (2) away from the cutting head (1), and the bottom of the second groove (4) is flush with the side of the blade (2) close to the cutting head (1).

6. The drill bit according to any one of claims 1 to 5, characterized in that: Also included is a drill pipe (5); A side of the cutting head (1) away from the blade (2) is welded or integrally formed with one end of the drill pipe (5), and the cutting head (1) is in communication with the drill pipe (5).

7. The drill bit according to claim 6, characterized in that At least one annular groove (50) is provided on the body of the drill pipe (5) close to the cutting head (1), and the annular groove (50) extends along the circumference of the drill pipe (5).

8. The drill bit according to claim 7, characterized in that There are a plurality of annular grooves (50), and the plurality of annular grooves (50) are distributed at equal intervals along the axial direction of the drill pipe (5).

9. The drill bit according to claim 6, characterized in that It also includes a sleeve (6), which is sleeved and fixed on the outside of the drill pipe (5) away from the cutting head (1).

10. A method for manufacturing a drill bit, for manufacturing the drill bit according to any one of claims 1 to 9, characterized in that: include: S1: Add 0.3%~0.8% of wetting agent to the alloy powder base and stir and mix; S2: filling the mixed base material into a graphite mold and sintering it to form a cutting head (1) and a blade (2); S3: Using a laser to open a first groove (3) between the blade (2) and the cutting head (1).

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