Double blade twist drill with chip removal structure

Abstract

The application relates to a double-blade bit with a chip removal structure, and relates to the technical field of metal cutting, which comprises a drill bit body, a reinforcing ring, a cutter head and two groups of blade strips, the cutter head is arranged at the other end of the drill bit body, the reinforcing ring is arranged on the surface of the drill bit body, the surface of the cutter head is provided with two groups of spiral grooves, and the surface of the cutter head is provided with two groups of blade strips, through the structure comprising the drill bit body, the reinforcing ring, the cutter head and the two groups of blade strips, the spiral grooves on the surface of the cutter head are matched with the two groups of blade strips, the guiding stability in the cutting process is improved through the double-blade strip design, the radial deviation of the drill bit is reduced, the hole axis is prevented from being inclined, meanwhile, the half-section type blade strip structure avoids the problem of weakened structural strength caused by the length of the complete double-blade strip being too long on the basis of ensuring stability, the spiral grooves can effectively optimize the chip removal space, reduce the accumulation of cutting chips, and improve the processing continuity and the hole wall quality.

Description

Technical Field

[0001] This application relates to metal cutting processes, and in particular to double-edged twist drills with chip removal mechanisms. Background Technology

[0002] Twist drills, as a fundamental tool for hole machining in the field of metal cutting, are widely used in various industrial scenarios such as machinery manufacturing, automotive parts production, and aerospace equipment processing due to their simple structure and wide applicability. In these scenarios, the accuracy, efficiency, and tool durability of drilling operations are directly related to product quality and production efficiency. The cutting edge of the twist drill, as a key structure that directly contacts the workpiece hole wall, not only plays a guiding and positioning role to ensure the straightness of the drill hole, but also reduces frictional resistance by reducing the contact area between the tool and the hole wall. It is one of the core factors affecting the overall performance of the drill bit.

[0003] In existing technologies, traditional twist drills mostly adopt a single-edge design, that is, a continuous cutting edge is set only on one side edge of the drill bit's spiral groove. This structure can basically meet the guiding and chip removal requirements when machining materials of ordinary hardness or shallow holes. However, when facing high-hardness alloy materials or deep hole machining, its defects gradually become apparent. Because the contact point between the single-edge and the hole wall is singular, the drill bit is prone to radial deviation during high-speed rotation cutting, resulting in the hole axis tilting. At the same time, the insufficient guiding stability of the single-edge will aggravate the local friction between the tool and the hole wall, causing cutting heat to concentrate. This not only easily causes chips to stick to the cutting edge and block the chip removal channel, but also accelerates the wear of the cutting edge and shortens the service life of the drill bit.

[0004] To address the stability issues of single-edge bands, existing technologies have developed double-edge band twist drills with chip removal structures. However, these double-edge bands are often complete structures running the entire length of the drill bit. While this improves guidance, the excessive length of the band weakens the overall structural strength of the tool. Furthermore, in deep hole machining, the band is prone to excessive contact with the hole wall, increasing chip removal resistance. To address this problem, this technology innovatively designs a semi-double-edge band structure, where the double-edge band extends only a portion of its length from the cutting end of the drill bit towards the tool shank. This design aims to optimize the length and distribution of the band, thereby improving tool structural strength while maintaining guidance stability, and balancing chip removal efficiency and durability. Utility Model Content The purpose of this application is to provide a double-edged twist drill with a chip removal structure, which has advantages such as high chip removal efficiency and solves the problem of chips easily sticking to the cutting edge and blocking the chip removal channel.

[0005] The double-edged twist drill with chip removal structure provided in this application adopts the following technical solution: it includes a drill body, a reinforcing ring, a cutting head and two sets of cutting edges. The cutting head is located at the other end of the drill body, the reinforcing ring is located on the surface of the drill body, the surface of the cutting head is provided with two sets of spiral grooves, and the surface of the cutting head is provided with two sets of cutting edges. By adopting the above technical solution, a structure including a drill body, a reinforcing ring, a cutting head, and two sets of cutting edges is used. The spiral grooves on the surface of the cutting head cooperate with the two sets of cutting edges. The double-cutting edge design improves the guiding stability during the cutting process, reduces the radial deviation of the drill, and avoids the tilting of the hole axis. At the same time, the half-cutting edge structure, while ensuring stability, avoids the structural strength weakening problem caused by the excessive length of a complete double-cutting edge. The spiral grooves can effectively optimize the chip removal space, reduce chip accumulation, and improve machining continuity and hole wall quality. The reinforcing ring further enhances the structural strength of the connection between the cutting head and the drill body, and extends the overall service life.

[0006] Preferably, the drill bit body includes a shank and a connector. The connector is located at the other end of the shank. The surface of the shank is provided with multiple sets of protrusions. Both cutting edges extend from the cutting end of the drill bit body toward the shank, and the extension length of the cutting edges is shorter than the length of the drill bit body.

[0007] By adopting the above technical solution, the setting of the tool holder and connector, combined with the protrusions on the surface of the tool holder, can increase the friction between the tool holder and the machine tool fixture, improve the stability of the connection, prevent slippage caused by vibration during processing, and ensure drilling accuracy.

[0008] Preferably, the other end of the handle is provided with a groove, and both the handle and the blade are provided with guide holes. The two sets of guide holes are connected. The blade is fixedly connected to the other end of the connector, and the reinforcing ring is fixedly connected to the connection between the blade and the connector.

[0009] By adopting the above technical solutions, the groove on the tool holder can help achieve precise matching with the machine tool positioning structure, improving installation and positioning efficiency; the connected guide hole can directly deliver coolant to the cutting area, promptly removing cutting heat and reducing chip adhesion; the reinforcing ring is fixed at the connection between the tool head and the connector, which can enhance the structural strength of this part, avoid fracture caused by long-term stress, and improve the reliability of the overall structure.

[0010] Preferably, the surface of the knife handle is provided with two sets of through grooves, and the bottom of the inner wall of each set of through grooves is fixedly connected with a spring. The other end of each set of springs is fixedly connected with a locking rod, and the two sets of locking rods are slidably connected in the two sets of through grooves respectively.

[0011] By adopting the above technical solution, the through groove on the surface of the tool holder, the spring and the locking rod cooperate, and the locking rod can extend and retract under the action of the spring, which can form a tight engagement with the corresponding structure of the machine tool fixture, enhance the connection between the tool holder and the machine tool, prevent loosening during the processing, and ensure the stability and continuity of the drilling process.

[0012] Preferably, the surfaces of the cutting head, the cutting edge, and the spiral groove are coated with a cemented carbide coating.

[0013] By adopting the above technical solution, a cemented carbide coating covers the cutting edge and spiral groove surface of the cutting head. Utilizing the high wear resistance of cemented carbide, the wear of the cutting edge during the cutting process can be reduced, while the adhesion of chips to the spiral groove can be reduced, thus extending the service life of the cutting head.

[0014] Preferably, both sets of the cutting edges are provided with an inclined surface on the side away from the blade axis, and the inclined surface of the cutting edge extends from the top of the cutting edge to the end of the cutting edge.

[0015] By adopting the above technical solution, the inclined surface of the cutting edge away from the axis of the cutting head extends from the top to the bottom, which can reduce the contact area between the cutting edge and the hole wall, reduce the frictional resistance during the cutting process, and guide the chips to flow into the spiral groove along the inclined surface, further optimizing the chip removal efficiency.

[0016] Preferably, the guide hole has several raised strips on the hole wall inside the cutter head, and the inner ring of the reinforcing ring has an annular raised edge.

[0017] By adopting the above technical solution, the protruding strip inside the guide hole can disrupt the flow path of the coolant, causing the coolant to form turbulence inside the guide hole, enhancing the contact with the hole wall, and improving the cooling effect; the annular protrusion of the reinforcing ring can form a tighter fit with the connection between the cutter head and the connector, further enhancing the structural strength of the connection part.

[0018] Preferably, the blade head is made of alloy, and the handle is made of high-speed steel.

[0019] By adopting the above technical solution, the cutting head is made of alloy material, which has high hardness and wear resistance, making it suitable for cutting high-hardness materials and ensuring cutting efficiency and accuracy; the tool holder is made of high-speed steel material, which has good toughness and strength and can withstand the impact and torque during the processing. The combination of the two allows the twist drill to have both excellent cutting performance and structural stability, ensuring the overall service life.

[0020] In summary, this application includes at least one of the following beneficial technical effects: 1. This double-edged twist drill with chip removal structure employs a design comprising a drill body, a reinforcing ring, a cutting head, and two sets of cutting edges. The helical grooves on the cutting head surface cooperate with the two sets of cutting edges. The double-edged design enhances guiding stability during cutting, reduces radial deviation of the drill bit, and prevents hole axis tilting. Simultaneously, the semi-cutting edge structure, while ensuring stability, avoids the structural strength weakening problem caused by excessive length of a complete double-edged edge. The helical grooves effectively optimize chip removal space, reduce chip accumulation, and improve machining continuity and hole wall quality. The reinforcing ring further strengthens the structural strength of the connection between the cutting head and the drill body, extending overall service life. The tool holder and connector, combined with the protrusions on the tool holder surface, increase friction between the tool holder and the machine tool fixture, improving connection stability, preventing slippage due to vibration during machining, and ensuring drilling accuracy.

[0021] 2. This double-edged twist drill with chip removal structure, aided by grooves on the shank, achieves precise alignment with the machine tool's positioning structure, improving installation and positioning efficiency. The connected guide hole directly delivers coolant to the cutting area, promptly removing cutting heat and reducing chip adhesion. A reinforcing ring, fixed at the connection between the drill bit and the connector, enhances the structural strength of this part, preventing breakage due to long-term stress and improving overall structural reliability. The through-groove, spring, and locking rod on the shank surface work together; the locking rod extends and retracts under spring pressure, forming a tight engagement with the corresponding structure of the machine tool fixture, strengthening the connection between the shank and the machine tool, preventing loosening during machining, and ensuring the stability and continuity of the drilling process. A carbide coating covers the cutting edge and helical groove surface of the drill bit; utilizing the high wear resistance of carbide, it reduces wear on the cutting edge during cutting, while also reducing chip adhesion to the helical groove, extending the drill bit's service life.

[0022] 3. This double-edged twist drill with chip removal structure features an inclined surface on the side of the cutting edge away from the drill head axis, extending from the top to the bottom. This reduces the contact area between the cutting edge and the hole wall, lowering frictional resistance during cutting. Simultaneously, it guides chips to flow along the inclined surface into the helical groove, further optimizing chip removal efficiency. The raised strips within the guide hole disrupt the coolant flow path, creating turbulence and enhancing contact with the hole wall, thus improving cooling. The annular convex edge of the reinforcing ring ensures a tighter fit between the drill head and the connector, further strengthening the structural strength of the connection. The drill head is made of alloy material, possessing high hardness and wear resistance, suitable for cutting high-hardness materials, ensuring cutting efficiency and precision. The shank is made of high-speed steel, exhibiting good toughness and strength, capable of withstanding impact and torque during machining. The combination of these two features allows the twist drill to balance excellent cutting performance with structural stability, guaranteeing overall service life. Attached Figure Description

[0023] Figure 1This is a frontal three-dimensional structural diagram of this application; Figure 2 This is a schematic diagram of the tool holder structure in this application; Figure 3 This is a side view of the structure of this application; Figure 4 This is a front view structural diagram of this application; Figure 5 for Figure 2 Enlarged structural diagram at point A in the middle.

[0024] In the diagram: 1. Drill bit body; 101. Tool holder; 102. Connector; 103. Protrusion; 104. Groove; 105. Through groove; 106. Spring; 107. Locking rod; 2. Reinforcing ring; 3. Tool tip; 4. Guide hole; 5. Carbide coating; 6. Cutting edge. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1 - Appendix Figure 5 This application will be described in further detail below.

[0026] Example 1: Half-cut double-edged blade with 6 twist drills, refer to Figure 1 The drill bit assembly includes a drill body 1, a reinforcing ring 2, a cutting head 3, and two sets of cutting edges 6. The cutting head 3 is located at the other end of the drill body 1, and the reinforcing ring 2 is located on the surface of the drill body 1. The surface of the cutting head 3 has two sets of spiral grooves and two sets of cutting edges 6. The structure includes the drill body 1, the reinforcing ring 2, the cutting head 3, and the two sets of cutting edges 6. The spiral grooves on the surface of the cutting head 3 cooperate with the two sets of cutting edges 6. The double cutting edge 6 design improves the guiding stability during the cutting process, reduces the radial offset of the drill bit, and avoids the tilting of the hole axis. At the same time, the half-cut cutting edge 6 structure, while ensuring stability, avoids the structural strength weakening problem caused by the excessive length of the complete double cutting edge 6. The spiral grooves can effectively optimize the chip removal space, reduce chip accumulation, and improve the machining continuity and hole wall quality. The reinforcing ring 2 further enhances the structural strength of the connection between the cutting head 3 and the drill body 1, and extends the overall service life.

[0027] Example 2: Half-cut double-edged blade with 6 twist drills, refer to Figure 2 and Figure 3The drill body 1 includes a shank 101 and a connector 102. The connector 102 is located at the other end of the shank 101. The surface of the shank 101 is provided with multiple sets of protrusions 103. Two cutting edges 6 extend from the cutting end of the drill body toward the shank 101, and the extension length of the cutting edges 6 is shorter than the length of the drill body. The arrangement of the shank 101 and the connector 102, combined with the protrusions 103 on the surface of the shank 101, can increase the friction between the shank 101 and the machine tool fixture, improve the stability of the connection, prevent slippage caused by vibration during processing, and ensure drilling accuracy. The other end of the shank 101 has a groove 104. Both the shank 101 and the cutter head 3 have guide holes 4 inside, and the two sets of guide holes 4 are connected. The cutter head 3 is fixedly connected to the other end of the connector 102. The reinforcing ring 2 is fixedly connected to the connection between the cutter head 3 and the connector 102. The groove 104 on the shank 101 can help achieve the positioning structure with the machine tool. Precise fit improves installation and positioning efficiency; the connected guide hole 4 can directly deliver coolant to the cutting area, promptly remove cutting heat, and reduce chip adhesion; the reinforcing ring 2 is fixed at the connection between the tool head 3 and the connector 102, which can enhance the structural strength of this part, avoid fracture caused by long-term stress, and improve the reliability of the overall structure. The surface of the tool holder 101 has two sets of through grooves 105. The bottom of the inner wall of each set of through grooves 105 is fixedly connected to a spring 106. The other end of each set of springs 106 is fixedly connected to a locking rod 107. The two sets of locking rods 107 are slidably connected in the two sets of through grooves 105 respectively. The through grooves 105, springs 106 and locking rods 107 on the surface of the tool holder 101 cooperate, and the locking rods 107 can extend and retract under the action of springs 106, which can form a tight engagement with the corresponding structure of the machine tool fixture, enhance the connection tightness between the tool holder 101 and the machine tool, prevent loosening during processing, and ensure the stability and continuity of the drilling process.

[0028] Example 3: Half-cut double-edged blade with 6 twist drills, refer to Figure 4 and Figure 5The surfaces of the cutting head 3, the cutting edge 6, and the spiral groove are coated with a cemented carbide coating 5. This coating covers the cutting edge 6 and the spiral groove surface of the cutting head 3. Utilizing the high wear resistance of cemented carbide, it reduces wear on the cutting edge 6 during cutting, while also reducing chip adhesion to the spiral groove, thus extending the service life of the cutting head 3. Both sets of cutting edges 6 have inclined surfaces on the side away from the axis of the cutting head 3. These inclined surfaces extend from the top to the bottom of the cutting edge 6, reducing the contact area between the cutting edge 6 and the hole wall, lowering frictional resistance during cutting, and guiding chips to flow along the inclined surfaces into the spiral groove, further optimizing chip removal efficiency. The guide hole 4 has several raised strips on the hole wall inside the cutting head 3 to strengthen... The inner ring of ring 2 has an annular raised edge. The raised strip in the guide hole 4 can disrupt the flow path of the coolant, causing the coolant to form turbulence in the guide hole 4, enhancing the contact with the hole wall and improving the cooling effect. The annular raised edge of the reinforcing ring 2 can form a tighter fit with the connection between the cutter head 3 and the connector 102, further enhancing the structural strength of the connection. The cutter head 3 is made of alloy, and the tool holder 101 is made of high-speed steel. The cutter head 3 is made of alloy material, which has high hardness and wear resistance, and is suitable for cutting high-hardness materials, ensuring cutting efficiency and accuracy. The tool holder 101 is made of high-speed steel material, which has good toughness and strength, and can withstand the impact and torque during the processing. The combination of the two allows the twist drill to have both excellent cutting performance and structural stability, ensuring the overall service life.

[0029] The implementation principle of this application embodiment is as follows: When using the half-cut double-edged twist drill with 6, the friction between the drill bit and the machine tool fixture is first increased by the protrusions 103 on the surface of the tool holder 101, and the groove 104 at the end of the tool holder 101 achieves precise docking with the machine tool positioning structure. At the same time, the locking rod 107 in the through groove 105 on the surface of the tool holder 101 extends and retracts under the action of the spring 106, forming a tight engagement with the corresponding structure of the machine tool fixture, ensuring that the drill bit is firmly installed and avoiding slippage or loosening due to vibration during processing, thus providing a stable foundation for subsequent drilling operations. During drilling operations, the two sets of spiral grooves on the surface of the cutter head 3 work together with the half-cutting edge 6, and the two edge 6 extend from the cutting end of the cutter head 3 toward the tool holder 101. Extending outwards, with an extension length shorter than the drill bit body, the symmetrical distribution of the double-edged band 6 enhances the guiding stability during the cutting process, reduces radial deviation of the drill bit to avoid tilting of the hole axis, and avoids structural strength weakening caused by excessive length of the complete double-edged band 6 due to the shorter length of the double-edged band 6. During the cutting process, the guide hole 4, which connects the tool holder 101 and the inside of the tool head 3, continuously delivers coolant. The protrusions in the guide hole 4 disrupt the flow path of the coolant, creating turbulence to enhance contact with the hole wall and improve the cooling effect. The reinforcing ring 2 at the connection between the tool head 3 and the connector 102 enhances the structural strength of this part through the annular protrusion of the inner ring, resists the impact force during cutting, and avoids fracture caused by long-term stress.

Claims

1. A double-edged twist drill with chip removal structure, comprising a drill body (1), a reinforcing ring (2), a cutting head (3), and two sets of cutting edges (6), characterized in that: The cutting head (3) is located at the other end of the drill bit body (1), the reinforcing ring (2) is located on the surface of the drill bit body (1), the surface of the cutting head (3) is provided with two sets of spiral grooves, and the surface of the cutting head (3) is provided with two sets of cutting edge bands (6).

2. The double-edged twist drill with chip removal structure according to claim 1, characterized in that: The drill bit body (1) includes a shank (101) and a connector (102). The connector (102) is located at the other end of the shank (101). The surface of the shank (101) is provided with multiple sets of protrusions (103). Both cutting edges (6) extend from the cutting end of the drill bit body (1) toward the shank (101), and the extension length of the cutting edges (6) is shorter than the length of the drill bit body (1).

3. The double-edged twist drill with chip removal structure according to claim 2, characterized in that: The other end of the handle (101) is provided with a groove (104). Both the handle (101) and the blade (3) are provided with guide holes (4). The two sets of guide holes (4) are connected. The blade (3) is fixedly connected to the other end of the connector (102). The reinforcing ring (2) is fixedly connected to the connection between the blade (3) and the connector (102).

4. The double-edged twist drill with chip removal structure according to claim 3, characterized in that: The surface of the handle (101) is provided with two sets of through grooves (105). The bottom of the inner wall of each set of through grooves (105) is fixedly connected with a spring (106). The other end of each set of springs (106) is fixedly connected with a locking rod (107). The two sets of locking rods (107) are slidably connected in the two sets of through grooves (105).

5. The double-edged twist drill with chip removal structure according to claim 4, characterized in that: The surfaces of the cutting head (3), the cutting edge (6) and the spiral groove are provided with a cemented carbide coating (5).

6. The double-edged twist drill with chip removal structure according to claim 5, characterized in that: Both sets of the cutting edge (6) have an inclined surface on the side away from the axis of the cutter head (3), and the inclined surface of the cutting edge (6) extends from the top of the cutting edge (6) to the end of the cutting edge (6).

7. The double-edged twist drill with chip removal structure according to claim 6, characterized in that: The guide hole (4) has several raised strips on the hole wall inside the cutter head (3), and the inner ring of the reinforcing ring (2) has an annular raised edge.

8. The double-edged twist drill with chip removal structure according to claim 7, characterized in that: The blade (3) is made of alloy, and the handle (101) is made of high-speed steel.

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