Spiral lip surface drill bit

Abstract

The invention relates to the field of spiral lip surface drill bits, and discloses a spiral lip surface drill bit which comprises a drill body, a spiral matrix and a cutting guiding body, the spiral matrix is arranged at the top of the drill body, a spiral inner lip is arranged on the outer side of the spiral matrix in a surrounding mode, and the cutting guiding body is arranged on the inner side of the spiral inner lip. A spiral inner lip is arranged on the outer side of the spiral matrix, a spiral outer lip is arranged on the outer side, away from the spiral inner lip, of the outer portion of the spiral matrix, an inner lip groove is formed in the spiral outer lip, an inner groove is formed in the inner side of the top of the spiral matrix, a machining drill bit is arranged on the top of the spiral matrix, and a cutting arm is arranged on the outer side of the top of the spiral matrix. According to the design, in the drilling process, cutting force is more uniform, cuttings are discharged more smoothly, the flowing path of the cuttings is effectively optimized through the design of the spiral outer lip and the inner lip groove, friction between the cuttings and the drill bit is reduced, and therefore the drilling efficiency and precision are remarkably improved.

Description

Technical Field

[0001] The invention relates to the field of spiral lip drill bits, in particular to a spiral lip drill bit. Background Art

[0002] In the field of mechanical manufacturing and processing, drilling is a basic and critical process. The performance of the spiral drill bit, as the core tool in drilling operations, directly affects the drilling efficiency, accuracy and processing quality of the workpiece. The spiral lip drill bit, as a specially designed drill type, can achieve more efficient cutting and more stable chip removal during the drilling process through its unique spiral structure and lip design, thereby meeting the needs of high-precision and high-efficiency drilling. With the continuous development of the manufacturing industry, the requirements for drilling technology are becoming higher and higher. It is necessary not only to increase the drilling speed, but also to ensure the accuracy and surface quality of the drilling. Therefore, the research and development of spiral lip drill bits with better performance is of great significance to improving the processing level and product quality of the manufacturing industry.

[0003] Traditional spiral drill bits have some obvious shortcomings in the drilling process. On the one hand, the spiral structure design of traditional drill bits is relatively simple, and the cutting force distribution is not uniform, which easily causes the drill bit to vibrate and deflect during the drilling process, affecting the drilling accuracy and surface quality. On the other hand, the chip groove design of traditional drill bits is not reasonable enough, and chips are easily blocked or accumulated during the discharge process, which increases the wear and heat of the drill bit and shortens the service life of the drill bit. In addition, when dealing with workpieces of different materials and thicknesses, traditional drill bits have relatively poor adaptability and flexibility, and drill bits of different specifications need to be replaced, which reduces work efficiency. These shortcomings not only affect the stability and reliability of the drilling process, but also increase manufacturing costs and time costs, restricting the further development of the manufacturing industry. Therefore, the development of a spiral lip drill bit that can overcome the shortcomings of traditional drill bits and improve drilling efficiency and accuracy has become a problem that needs to be urgently solved in the current manufacturing industry. For this reason, the present invention proposes a spiral lip drill bit. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a spiral lip drill bit to solve the above problems.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a spiral lip drill bit, comprising a drill body, a spiral carcass and a cutting guide, the top of the drill body is provided with a spiral carcass, the outer side of the spiral carcass is surrounded by a spiral inner lip, the inner side of the spiral inner lip is provided with a cutting guide, the outer side of the spiral carcass is provided with a spiral outer lip away from the outer side of the spiral inner lip, the inner side of the spiral outer lip is provided with an inner lip groove, the inner side of the top of the spiral carcass is provided with an inner groove, the top of the spiral carcass is provided with a processing drill bit, and the top outer side of the spiral carcass is provided with a cutting arm.

[0006] Preferably, the outer side of the drill body presents a cylindrical structure, the drill body adopts a fully ground drill shank, a positioning hole is provided at the bottom of the drill body, the drill body is made of high-strength wear-resistant alloy, strengthened by heat treatment, and has a hardness of not less than 50HRC. The outer surface thereof adopts an ultra-precision grinding process, the cylindricity deviation is less than 0.01mm, and the surface roughness Ra is not greater than 0.8μm. The connecting surface between the top of the drill body and the spiral carcass is laser welded, and the weld strength is not less than 90% of the strength of the drill body parent material.

[0007] Preferably, the spiral carcass is a double helix structure, consisting of two mutually intertwined spiral lines, and the two spiral lines have the same pitch and diameter.

[0008] Preferably, the inner side of the guide cutter is tightly fitted with the spiral inner lip, the guide cutter is arranged spirally along the spiral inner lip, the spiral matrix is ​​made of tungsten-cobalt cemented carbide with a hardness of 89-93HRA, and the surface of the spiral inner lip is coated with a titanium nitride coating with a thickness of 0.005-0.01mm by chemical vapor deposition process to improve its wear resistance and corrosion resistance. The guide cutter is made of polycrystalline diamond material and the cutting edge sharpness is less than 0.02mm.

[0009] Preferably, the spiral outer lip is arranged on the outside of the spiral carcass with a spiral structure, the spiral angle of the spiral outer lip is 15-30°, the pitch is 5-10mm, the inner surface roughness Ra of the inner lip groove is not more than 1.6μm, and microstructure treatment is performed to reduce the friction coefficient between the chips and the groove wall. The processing drill bit is manufactured by a multi-axis linkage grinding process, the cutting edge runout is less than 0.005mm, the cutting arm is made of high-strength stainless steel, and is tempered with a hardness of 45-55HRC. The surface is plated with a layer of hard chrome with a thickness of 0.02-0.05mm to improve its wear resistance.

[0010] Preferably, a latch surface is provided around the outer side of the drill body, the width of the latch surface is 5mm-15mm, the surface flatness deviation is less than 0.02mm, the verticality deviation between the latch surface and the outer cylindrical surface of the drill body is less than 0.05mm, and the surface hardness is 55HRC-65HRC.

[0011] Preferably, a fixing hole is provided inside the latch surface, the fixing hole passes through the drill body, and a threaded structure is provided inside the fixing hole, the aperture of the fixing hole is 5-12mm, the aperture tolerance is 0.05-0.1mm, the pitch is 1mm, the thread mean diameter tolerance is 6H, the thread surface roughness Ra is not greater than 1.6μm, and the perpendicularity deviation between the axis of the fixing hole and the latch surface is less than 0.01mm.

[0012] Preferably, an inner carcass is provided inside the spiral carcass, the inner carcass is made of high-speed steel, is quenched and tempered, has a hardness of 60-65HRC, the outer surface roughness Ra of the inner carcass is not greater than 0.8μm, and the fit with the spiral carcass is an interference fit with an interference amount of 0.02-0.05mm.

[0013] Preferably, a heat-insulating layer is provided on the outside of the inner carcass. The heat-insulating layer is made of nano-aerogel material and has a thickness of 1-3 mm. The thermal conductivity of the heat-insulating layer is not greater than 0.02 W / (m・K) and the compressive strength is not less than 2 MPa. The heat-insulating layer is bonded to the inner carcass through a vacuum impregnation process and the bonding strength meets 5 MPa.

[0014] Compared with the prior art, the present invention provides a spiral lip drill bit, which has the following beneficial effects: The present invention adopts a spiral matrix with a double helix structure. The above design makes the cutting force more uniform and the chip discharge smoother during the drilling process. Traditional drill bits often lead to a decrease in drilling efficiency and even affect the drilling accuracy due to chip accumulation. The spiral outer lip and inner lip groove design of the present invention effectively optimizes the flow path of the chips and reduces the friction between the chips and the drill bit, thereby significantly improving the drilling efficiency and accuracy. In addition, the fine processing function of the processing drill bit ensures the final dimensional accuracy and surface quality of the drilled hole, meeting the needs of high-precision drilling.

[0015] The present invention provides internal support and reinforcement through the inner carcass, thereby enhancing the overall strength and rigidity of the spiral carcass, enabling it to withstand greater drilling force and torque. At the same time, the effective design of the thermal insulation layer prevents heat from being transferred to the inner carcass, thereby protecting the performance and life of the inner carcass. Compared with traditional drill bits, the present invention has stronger stability and durability, reduces the frequency of drill bit replacement, and reduces the cost of use.

[0016] The present invention designs a coolant storage space in the inner groove to provide continuous cooling and lubrication for the drilling part. This design not only reduces friction and heat generation, but also improves the service life of the drill bit and the drilling quality. Compared with traditional drill bits, the present invention has significant advantages in cooling and lubrication, and is particularly suitable for working conditions that require long-term continuous drilling.

[0017] The present invention can conveniently install auxiliary supports or positioning devices through the design of the pin surface and the fixing holes, thereby enhancing the adaptability and flexibility of the drilling process. This design enables the present invention to cope with more types of drilling needs, without the need for frequent replacement of drill bits, thereby improving work efficiency. At the same time, the high-precision design of the pin surface and the fixing holes also ensures the stable installation and accurate positioning of the auxiliary devices, further improving the accuracy and quality of drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the local three-dimensional structure of A of the present invention; Figure 3 It is a schematic diagram of the local three-dimensional structure of position B of the present invention; Figure 4 It is a schematic diagram of the top view of the structure of the present invention; Figure 5 It is a bottom view structural schematic diagram of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the drill body of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the drill body cross section of the present invention; Figure 8 It is a schematic diagram of the cross-sectional structure of the present invention.

[0019] In the figure: 1, drill body; 101, positioning hole; 2, spiral carcass; 201, spiral inner lip; 3, cutting guide; 4, spiral outer lip; 5, inner lip groove; 6, inner groove; 7, processing drill bit; 8, cutting arm; 9, pin surface; 10, fixing hole; 11, inner carcass; 12, thermal insulation layer. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-8 A spiral lip drill bit comprises a drill body 1, a spiral carcass 2 and a cutting guide 3, characterized in that: a spiral carcass 2 is provided on the top of the drill body 1, a spiral inner lip 201 is provided around the outer side of the spiral carcass 2, a cutting guide 3 is provided on the inner side of the spiral inner lip 201, a spiral outer lip 4 is provided on the outer side of the spiral carcass 2 away from the outer side of the spiral inner lip 201, an inner lip groove 5 is provided inside the spiral outer lip 4, an inner groove 6 is provided on the inner side of the top of the spiral carcass 2, a processing drill bit 7 is provided on the top of the spiral carcass 2, and a cutting arm 8 is provided on the outer side of the top of the spiral carcass 2.

[0022] The outer side of the drill body 1 presents a cylindrical structure, the drill body 1 adopts a fully ground drill handle, and a positioning hole 101 is provided at the bottom of the drill body 1. The drill body 1 is made of high-strength wear-resistant alloy, and is strengthened by heat treatment, with a hardness of not less than 50HRC. The outer surface thereof adopts an ultra-precision grinding process, and the cylindricality deviation is less than 0.01mm, and the surface roughness Ra is not greater than 0.8μm. The connection surface between the top of the drill body 1 and the spiral matrix 2 is laser welded, and the weld strength is not less than 90% of the strength of the parent material of the drill body 1. The outer side of the drill body presents a cylindrical structure, which is convenient for close cooperation with the fixture of the drilling equipment to ensure the stability of the drill bit during the drilling process. The fully ground drill handle is adopted to improve the accuracy and surface quality of the drill body, making the drill bit more reliable during installation and use. A positioning hole 101 is provided at the bottom of the drill body, which further enhances the positioning accuracy of the drill bit and the equipment. The drill body is made of high-strength wear-resistant alloy and is strengthened by heat treatment. The hardness is not less than 50HRC, which ensures that the drill body is not easily deformed or damaged when subjected to the huge pressure and friction generated during the drilling process. The outer surface is made of ultra-precision grinding technology, the cylindricality deviation is less than 0.01mm, and the surface roughness Ra is not more than 0.8μm, which ensures the close fit and precise rotation of the drill body and the fixture. The connecting surface between the top of the drill body and the spiral carcass 2 is laser welded, and the weld strength is not less than 90% of the strength of the drill body parent material. This strong connection ensures that the rotational power can be stably transmitted to the spiral carcass, thereby improving the overall performance and service life of the drill bit.

[0023] The spiral carcass 2 is a double helix structure, consisting of two spiral lines intertwined with each other, and the pitch and diameter of the two spiral lines are the same. This design enables the spiral carcass to generate a more uniform cutting force during rotation, thereby improving the efficiency and accuracy of drilling. The double helix structure can also effectively disperse the heat and stress generated during the drilling process, reduce the wear and deformation of the drill bit, and extend the service life of the drill bit. At the same time, the double helix structure makes the chip discharge process smoother, reduces the possibility of chip accumulation and blockage, and further improves the stability and reliability of drilling.

[0024] The inner side of the cutting body 3 is tightly fitted with the spiral inner lip 201, and the cutting body 3 is arranged in a spiral along the spiral inner lip 201. The spiral matrix 2 is made of tungsten-cobalt cemented carbide with a hardness of 89-93HRA. The surface of the spiral inner lip 201 is plated with a titanium nitride coating with a thickness of 0.005-0.01mm by chemical vapor deposition CVD process to improve its wear resistance and corrosion resistance. The cutting body 3 is made of polycrystalline diamond material with a cutting edge sharpness of less than 0.02mm. The cutting guide can accurately guide the drill bit into the workpiece and preliminarily cut out the path for drilling. The spiral matrix 2 is made of tungsten-cobalt cemented carbide with high hardness and good wear resistance, which ensures the stability and durability of the drill bit during the drilling process. The surface of the spiral inner lip 201 is coated with a titanium nitride coating with a thickness of 0.005-0.01mm by chemical vapor deposition process, which further improves its wear resistance and corrosion resistance, so that the drill bit can still maintain good performance in harsh working environments. The cutting guide 3 ensures that the drill bit can quickly and accurately cut out the path for drilling when it contacts the workpiece, thereby improving the efficiency and accuracy of drilling.

[0025] The spiral outer lip 4 is arranged around the outside of the spiral carcass 2 with a spiral structure. The spiral angle of the spiral outer lip 4 is 15-30°, the pitch is 5-10mm, the inner surface roughness Ra of the inner lip groove 5 is not greater than 1.6μm, and microstructure treatment is performed to reduce the friction coefficient between the chips and the groove wall. The processing drill bit 7 is manufactured using a multi-axis linkage grinding process, and the edge runout is less than 0.005mm. The cutting arm 8 is made of high-strength stainless steel, and after quenching and tempering, the hardness is 45-55HRC, and the surface is plated with a layer of hard chrome with a thickness of 0.02-0.05mm to improve its wear resistance. The spiral outer lip 4 is arranged around the outside of the spiral carcass 2 with a spiral structure, and the design of its spiral angle and pitch makes the cutting The chips are discharged more smoothly during the process, which reduces the friction and resistance between the chips and the drill bit, and improves the efficiency and stability of drilling. The inner surface roughness Ra of the inner lip groove 5 is not more than 1.6μm, and microstructure treatment is performed to further reduce the friction coefficient between the chips and the groove wall, so that the chips can be discharged more smoothly, reducing the possibility of chip accumulation and blockage. The processing drill bit 7 is manufactured using a multi-axis linkage grinding process, and the edge runout is less than 0.005mm, which ensures the accuracy and stability of the drill bit during the drilling process. The cutting arm 8 is made of high-strength stainless steel and has been tempered and hard chrome-plated on the surface to improve its wear resistance and corrosion resistance, so that the drill bit can still maintain good performance after long-term use.

[0026] The outer side of the drill body 1 is surrounded by a latch surface 9, the width of the latch surface 9 is 5mm-15mm, the surface flatness deviation is less than 0.02mm, the verticality deviation between the latch surface 9 and the outer cylindrical surface of the drill body 1 is less than 0.05mm, and the surface hardness is 55HRC-65HRC. The outer side of the drill body 1 is surrounded by a latch surface 9, and its width, surface flatness and the outer cylindrical surface of the drill body ensure the accuracy and stability of the latch surface. The surface hardness of the latch surface is 55HRC-65HRC, has high wear resistance and impact resistance, can withstand greater force and pressure during the drilling process without being easily deformed or damaged, and the design of the latch surface makes the drill bit more convenient and reliable when auxiliary support or positioning device needs to be installed, thereby improving the adaptability and flexibility of the drill bit.

[0027] A fixing hole 10 is provided inside the plug surface 9, and the fixing hole 10 passes through the drill body 1, and a threaded structure is provided inside the fixing hole 10. The aperture of the fixing hole 10 is 5-12mm, the aperture tolerance is 0.05-0.1mm, the pitch is 1mm, the thread median diameter tolerance is 6H, the thread surface roughness Ra is not greater than 1.6μm, and the verticality deviation between the axis of the fixing hole 10 and the plug surface 9 is less than 0.01mm. The fixing hole 10 is provided inside the plug surface 9, and the fixing hole is provided with a threaded structure, which is convenient for using bolts or pins to firmly fix the auxiliary device on the drill body. The aperture, aperture tolerance, pitch, thread median diameter tolerance and thread surface roughness of the fixing hole are strictly controlled to ensure the accuracy and stability of the fixing hole. The verticality deviation between the axis of the fixing hole and the plug surface is less than 0.01mm, which ensures the accuracy and reliability of the auxiliary device during installation. This design makes it more convenient and quick to install the auxiliary device when the drill bit needs to install the auxiliary device, thereby improving the efficiency and convenience of the use of the drill bit.

[0028] An inner carcass 11 is provided inside the spiral carcass 2. The inner carcass 11 is made of high-speed steel and has been quenched and tempered to have a hardness of 60-65HRC. The outer surface roughness Ra of the inner carcass 11 is not greater than 0.8μm, and the fit with the spiral carcass 2 is an interference fit with an interference amount of 0.02-0.05mm. An inner carcass 11 is provided inside the spiral carcass 2. The inner carcass 11 is made of high-speed steel and has been quenched and tempered to have high hardness and strength, and can provide solid internal support and reinforcement for the spiral carcass. The outer surface roughness of the inner carcass is strictly controlled to ensure its close fit with the spiral carcass and the accuracy of the interference fit. The design of the interference amount enables the inner carcass to be firmly fixed inside the spiral carcass and is not easy to loosen or fall off, thereby improving the overall stability and reliability of the drill bit. This design enables the drill bit to be more stable and reliable when subjected to greater drilling force and torque, thereby extending the service life of the drill bit.

[0029] The outer side of the inner carcass 11 is provided with a heat-insulating layer 12, which is made of nano-aerogel material and has a thickness of 1-3 mm. The thermal conductivity of the heat-insulating layer 12 is not more than 0.02 W / (m・K), and the compressive strength is not less than 2 MPa. The heat-insulating layer 12 is combined with the inner carcass 11 through a vacuum impregnation process, and the bonding strength meets 5 MPa. The outer side of the inner carcass 11 is provided with a heat-insulating layer 12, which is made of nano-aerogel material and has extremely low thermal conductivity and high compressive strength. The design of the heat-insulating layer can effectively prevent heat from being transferred to the inner carcass, thereby protecting the performance and life of the inner carcass, while also reducing the influence of heat on the entire drill bit structure, maintaining the stability and precision of the drill bit. The heat-insulating layer is combined with the inner carcass through a vacuum impregnation process, has high bonding strength, is not easy to fall off or be damaged, and improves the durability and reliability of the drill bit. This design enables the drill bit to maintain good performance when a large amount of heat is generated during long-term continuous drilling or drilling, thereby improving the use efficiency and application scope of the drill bit.

[0030] Working principle: First, install the drill body 1 on the fixture of the drilling machine or other drilling equipment. The cylindrical structure on the outside of the drill body 1 and the positioning hole 101 at the bottom ensure that the drill bit can be accurately and stably installed on the equipment. The drill body 1 is made of high-strength wear-resistant alloy with a hardness of not less than 50HRC, which enables it to withstand the huge pressure and friction generated during the drilling process. The ultra-precision grinding process on its outer surface has a cylindrical deviation of less than 0.01mm and a surface roughness Ra of not more than 0.8μm, which ensures a close fit and precise rotation with the fixture. When the drilling equipment is started, the drill body 1 starts to rotate, and the connection surface between the top of the drill body 1 and the spiral carcass 2 is laser welded, and the weld strength is not less than 90% of the strength of the drill body 1 parent material. This strong connection ensures To ensure that the rotational power can be stably transmitted to the spiral carcass 2, the spiral carcass 2 is a double helix structure, composed of two spiral lines intertwined with each other, the pitch and diameter of the two spiral lines are the same, and driven by the drill body 1, the spiral carcass 2 rotates at a high speed. Through this double helix structure, the spiral carcass 2 can cut and discharge chips more effectively during the drilling process. A spiral inner lip 201 is arranged around the outer side of the spiral carcass 2, and a guide body 3 is arranged on the inner side of the spiral inner lip 201. The inner side of the guide body 3 is tightly fitted with the spiral inner lip 201, and is spirally arranged along the spiral inner lip 201. During the drilling process, the guide body 3 first contacts the surface of the workpiece, and guides the drill bit into the workpiece through its sharp cutting edge and special spiral arrangement, and preliminarily cuts out the path for drilling. Through this linkage, the cutting guide 3 and the spiral inner lip 201 work together to achieve the effect of efficient cutting and preliminary forming. As the spiral carcass 2 continues to rotate, the spiral outer lip 4 begins to play a role. The spiral outer lip 4 adopts a spiral structure and is arranged around the outside of the spiral carcass 2. The spiral angle is 15-30° and the pitch is 5-10mm. This design allows the chips to be discharged smoothly along the spiral channel of the spiral outer lip 4 during the drilling process, preventing the chips from accumulating and affecting the drilling efficiency and quality. The existence of the inner lip groove 5 further optimizes the flow of the chips. The inner surface roughness Ra of the inner lip groove 5 is not greater than 1.6μm, and the microstructure treatment is performed to reduce the friction coefficient between the chips and the groove wall, so that the chips can be discharged more smoothly. The linkage of the lip groove 5 achieves the effect of effective chip removal. An inner groove 6 is provided on the inner side of the top of the spiral carcass 2. This inner groove 6 can hold a certain amount of coolant during the drilling process to provide cooling and lubrication for the drilling part, reduce friction and heat generation, and improve the service life of the drill bit and the drilling quality. A processing drill bit 7 is provided on the top of the spiral carcass 2. The processing drill bit 7 is manufactured using a multi-axis linkage grinding process, and the edge runout is less than 0.005mm. In the final stage of drilling, the processing drill bit 7 performs fine processing on the drill hole to ensure the dimensional accuracy and surface quality of the drill hole. A cutting arm 8 is provided on the outer side of the top of the spiral carcass 2. The cutting arm 8 is made of high-strength stainless steel, which has been quenched and tempered to a hardness of 45-55HRC, and is coated with a layer of 0.02-0.05mm hard chrome, during the drilling process, the cutting arm 8 can trim and support the edge of the drill hole to prevent the edge of the drill hole from cracking or deformation. The outer side of the drill body 1 is surrounded by a latch surface 9, the width of the latch surface 9 is 5mm-15mm, the surface flatness deviation is less than 0.02mm, the verticality deviation between the latch surface 9 and the outer cylindrical surface of the drill body 1 is less than 0.05mm, and the surface hardness is 55HRC-65HRC. In some special drilling conditions, it is necessary to install auxiliary support or fixed bolt surface 9. A positioning device is provided to enhance the stability and accuracy of drilling. A fixing hole 10 is provided inside the plug surface 9. The fixing hole 10 passes through the drill body 1. The hole diameter is 5-12mm, the hole diameter tolerance is 0.05-0.1mm, the pitch is 1mm, the thread diameter tolerance is 6H, the thread surface roughness Ra is not greater than 1.6μm, and the verticality deviation between the axis of the fixing hole 10 and the plug surface 9 is less than 0.01mm. Through the fixing hole 10, the auxiliary device can be firmly fixed on the drill body 1 with a bolt or a pin to ensure that the auxiliary device is firmly fixed on the drill body 1 during drilling. There will be no loosening or displacement during the drilling process. An inner carcass 11 is arranged inside the spiral carcass 2. The inner carcass 11 is made of high-speed steel and has been quenched and tempered to have a hardness of 60-65HRC. The outer surface roughness Ra of the inner carcass 11 is not greater than 0.8μm, and the fit with the spiral carcass 2 is an interference fit with an interference amount of 0.02-0.05mm. The inner carcass 11 provides internal support and reinforcement for the spiral carcass 2, thereby enhancing the overall strength and rigidity of the spiral carcass 2 and enabling it to withstand greater drilling force. In order to reduce the torque and the heat insulation layer 12 is provided on the outside of the inner carcass 11, the heat insulation layer 12 is made of nano-aerogel material with a thickness of 1-3mm, the thermal conductivity of the heat insulation layer 12 is not more than 0.02W / (m・K), and the compressive strength is not less than 2MPa. During the drilling process, a large amount of heat will be generated due to friction. The heat insulation layer 12 can effectively prevent the heat from being transferred to the inner carcass 11, protecting the performance and life of the inner carcass 11, and also reducing the influence of heat on the entire drill structure, maintaining the stability and precision of the drill.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A spiral lip drill bit, comprising a drill body (1), a spiral matrix (2) and a cutting guide (3), characterized in that: A spiral carcass (2) is provided at the top of the drill body (1), a spiral inner lip (201) is provided around the outer side of the spiral carcass (2), a cutting guide (3) is provided on the inner side of the spiral inner lip (201), a spiral outer lip (4) is provided on the outer side of the spiral carcass (2) away from the spiral inner lip (201), an inner lip groove (5) is provided inside the spiral outer lip (4), an inner groove (6) is provided on the inner side of the top of the spiral carcass (2), a processing drill bit (7) is provided on the top of the spiral carcass (2), and a cutting arm (8) is provided on the outer side of the top of the spiral carcass (2).

2. A spiral lip drill bit according to claim 1, characterized in that: The drill body (1) has a cylindrical structure on the outside. The drill body (1) adopts a fully ground drill handle. A positioning hole (101) is provided at the bottom of the drill body (1). The drill body (1) is made of a high-strength wear-resistant alloy and is strengthened by heat treatment. The hardness is not less than 50HRC. The outer surface is processed by ultra-precision grinding. The cylindricality deviation is less than 0.01mm and the surface roughness Ra is not greater than 0.8μm. The connection surface between the top of the drill body (1) and the spiral carcass (2) is laser welded. The weld strength is not less than 90% of the parent material strength of the drill body (1).

3. The spiral lip drill bit according to claim 1, characterized in that: The spiral carcass (2) is a double helix structure, consisting of two mutually intertwined spiral lines, the two spiral lines having the same pitch and diameter.

4. The spiral lip drill bit according to claim 1, characterized in that: The inner side of the cutting body (3) is tightly fitted with the spiral inner lip (201), and the cutting body (3) is arranged in a spiral along the spiral inner lip (201). The spiral matrix (2) is made of tungsten-cobalt cemented carbide with a hardness of 89-93HRA. The surface of the spiral inner lip (201) is coated with a titanium nitride coating with a thickness of 0.005-0.01mm by chemical vapor deposition process to improve its wear resistance and corrosion resistance. The cutting body (3) is made of polycrystalline diamond material, and the sharpness of the cutting edge is less than 0.02mm.

5. The spiral lip drill bit according to claim 1, characterized in that: The spiral outer lip (4) is arranged on the outer side of the spiral carcass (2) in a spiral structure, the spiral outer lip (4) has a spiral lead angle of 15-30° and a pitch of 5-10 mm, the inner surface roughness Ra of the inner lip groove (5) is not greater than 1.6 μm, and microstructure treatment is performed to reduce the friction coefficient between the chips and the groove wall, the processing drill bit (7) is manufactured by a multi-axis linkage grinding process, and the edge runout is less than 0.005 mm, the cutting arm (8) is made of high-strength stainless steel, is quenched and tempered, has a hardness of 45-55 HRC, and is plated with a layer of hard chrome with a thickness of 0.02-0.05 mm on the surface to improve its wear resistance.

6. The spiral lip drill bit according to claim 1, characterized in that: The outer side of the drill body (1) is surrounded by a latch surface (9), the latch surface (9) has a width of 5 mm to 15 mm, a surface flatness deviation of less than 0.02 mm, a verticality deviation between the latch surface (9) and the outer cylindrical surface of the drill body (1) of less than 0.05 mm, and a surface hardness of 55 HRC to 65 HRC.

7. A spiral lip drill bit according to claim 6, characterized in that: A fixing hole (10) is provided inside the latch surface (9), the fixing hole (10) passes through the drill body (1), and a thread structure is provided inside the fixing hole (10), the hole diameter of the fixing hole (10) is 5-12 mm, the hole diameter tolerance is 0.05-0.1 mm, the pitch is 1 mm, the thread median diameter tolerance is 6H, the thread surface roughness Ra is not greater than 1.6 μm, and the verticality deviation between the axis of the fixing hole (10) and the latch surface (9) is less than 0.01 mm.

8. The spiral lip drill bit according to claim 1, characterized in that: An inner carcass (11) is arranged inside the spiral carcass (2). The inner carcass (11) is made of high-speed steel and has been quenched and tempered to have a hardness of 60-65 HRC. The outer surface roughness Ra of the inner carcass (11) is not greater than 0.8 μm, and the fit between the inner carcass (11) and the spiral carcass (2) is an interference fit, with an interference amount of 0.02-0.05 mm.

9. The spiral lip drill bit according to claim 1, characterized in that: The outer side of the inner carcass (11) is provided with a heat insulation layer (12), the heat insulation layer (12) is made of nano-aerogel material, has a thickness of 1-3 mm, has a thermal conductivity of no more than 0.02 W / (m·K), and has a compressive strength of no less than 2 MPa. The heat insulation layer (12) is bonded to the inner carcass (11) by a vacuum impregnation process, and has a bonding strength of 5 MPa.

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