Three-edge efficient drill

Abstract

The three-edge efficient drill comprises a tool body provided with a tool handle part and a cutting part, the end face, away from the tool handle part, of the cutting part is a conical face, and at least three main cutting edges are arranged on the conical face. The side wall of the cutting part is provided with auxiliary cutting edges which are in one-to-one correspondence with the main cutting edges and are spirally arranged with the cutter handle part as the axis, one side of each main cutting edge is provided with a chip containing groove, the main cutting edges are designed in a curve mode, the curved surface where the main cutting edges are located is a cutting edge rear cutter face, and the cutting edge rear cutter face is a cutting edge rear cutter face. The angle of the rear cutter surface of each cutting edge is gradually increased from the main cutting edge to one side far away from the main cutting edge, so that the cutting vibration is small, and a more stable self-centering effect is realized; and a high-wear-resistance bar and a coating are selected, so that the durability of the tool is greatly improved, and the overall efficiency is improved by 33%.

Description

Technical Field

[0001] The utility model relates to the technical field of drill bits for mechanical processing, and more specifically to a three-edged high-efficiency drill. Background Art

[0002] Hole processing plays an important role in metal cutting, generally accounting for about 1 / 3 of the machining volume. Drilling accounts for about 22% to 25%, and the rest of the hole processing accounts for about 11% to 13%. Due to the harsh hole processing conditions, the technical development of hole processing tools is slower than that of turning and milling tools. In recent years, with the continuous improvement of production efficiency, automation level and machining center performance requirements for medium and small batch production, some manufacturers have introduced three-edge drills, which have improved the original two-edge drills into three-edge drills, making up for some of the shortcomings of ordinary twist drills.

[0003] The utility model patent with announcement number CN 213729539 U discloses an efficient three-edge drill for processing holes in commercial vehicle powertrains, including a blade body and a shank, the blade body and the shank are connected by a thread, the blade body is provided with at least three cutting edges, a spiral groove is provided between two adjacent cutting edges, each cutting edge includes a main cutting edge and a circumferential edge, a chamfer is provided at the junction of the main cutting edge and the circumferential edge, the main cutting edge adopts a multi-segment curved surface design, including a cutting edge flank and a chip groove, and a drill tip is formed at the junction of the cutting edge flanks on the three cutting edges.

[0004] However, the curved surface of the above technical solution is not limited, and in the actual processing process, the curved surface angle has an important influence on the drilling efficiency. Utility Model Content

[0005] In view of this, in order to solve the above problems, the utility model proposes a three-edge high-efficiency drill, including a tool body having a shank portion 1 and a cutting portion 2, the end face of the cutting portion 2 away from the shank portion 1 is a conical surface, at least three main cutting edges 3 are arranged on the conical surface, the side wall of the cutting portion 2 is provided with secondary cutting edges 4 which correspond to the main cutting edges 3 one by one and are spirally arranged with the shank portion 1 as the axis, a chip groove 5 is provided on one side of the main cutting edge 3, the main cutting edge 3 is a curved design, and the curved surface where the main cutting edge 3 is located is a cutting edge flank 6, and the angle of each cutting edge flank 6 increases successively from the main cutting edge 3 to the side away from the main cutting edge 3, so that the cutting vibration is small and a more stable self-centering effect is achieved; high wear-resistant rods and coatings are selected to greatly improve the tool durability and improve the overall efficiency by 33%.

[0006] A three-edged high-efficiency drill comprises a tool body having a shank portion 1 and a cutting portion 2, wherein the end face of the cutting portion 2 away from the shank portion 1 is a conical surface, and at least three main cutting edges 3 are arranged on the conical surface, and the side wall of the cutting portion 2 is provided with secondary cutting edges 4 which respectively correspond to the main cutting edges 3 one by one and are spirally arranged with the shank portion 1 as the axis, and a chip groove 5 is provided on one side of the main cutting edge 3, characterized in that: the main cutting edge 3 is a curved design, and the curved surface where the main cutting edge 3 is located is a cutting edge flank 6, and the angle of each cutting edge flank 6 increases successively from the main cutting edge 3 to the side away from the main cutting edge 3, so that the cutting vibration is small and a more stable self-centering effect is achieved.

[0007] Furthermore, the cutting edge flank 6 is based on the tool diameter. When the angle of the cutting edge flank 6 is larger, the tool diameter is smaller. The tool diameter changes by 2 to 4 mm for every 1° change in the cutting edge flank 6. The minimum angle is between 8° and 10°, and the maximum angle is 18°.

[0008] Furthermore, the main cutting edge 3 extends to the center of the tool body to form a rotating drill tip structure 7, and the top angle of the drill tip structure 7 is between 120° and 150°.

[0009] Furthermore, the main cutting edge 3 is designed to be curved, and the back angle of the main cutting edge 3 decreases from the drill tip to the outside.

[0010] Furthermore, the edge of the main cutting edge 3 away from the drill tip is provided with a negative chamfer 8 for ensuring the strength of the cutting edge and improving the chip breaking function.

[0011] Furthermore, a chip removal groove 9 is provided between the secondary cutting edges 4, and the chip removal groove 9 is spirally arranged to improve the chip removal performance during machining while taking into account the rigidity of the tool structure.

[0012] Furthermore, an inner cooling hole 10 is provided between the main cutting edge 3 and the chip removal groove 9 , and the inner cooling hole 10 runs through the entire blade body and is spirally arranged with the shank portion 1 as the axis.

[0013] Furthermore, at least three oil grooves 11 are provided at the bottom end of the shank portion 1, and the oil grooves 11 correspond to the inner cooling holes 10. The oil grooves 11 are used to guide the coolant so that the coolant converges to the inner cooling holes 10 to increase the flow rate.

[0014] Furthermore, the cutting part 2 uses high wear-resistant rod tungsten carbide and a coating containing nitrogen, chromium, aluminum, and silicon elements, which greatly improves the durability of the tool.

[0015] The beneficial effects of the utility model are as follows: the utility model proposes a three-edge high-efficiency drill, comprising a tool body having a shank portion 1 and a cutting portion 2, the end face of the cutting portion 2 away from the shank portion 1 being a conical surface, at least three main cutting edges 3 being arranged on the conical surface, the side wall of the cutting portion 2 being provided with secondary cutting edges 4 corresponding one to one to the main cutting edges 3 and spirally arranged with the shank portion 1 as the axis, a chip groove 5 being provided on one side of the main cutting edge 3, the main cutting edge 3 being a curved design, the curved surface where the main cutting edge 3 is located being a cutting edge flank 6, the angle of each cutting edge flank 6 increasing successively from the main cutting edge 3 to the side away from the main cutting edge 3, so that the cutting vibration is small and a more stable self-centering effect is achieved; high wear-resistant rods and coatings are selected to greatly improve the tool durability and improve the overall efficiency by 33%. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The drill bit structure diagram of the three-edged high-efficiency drill of the utility model.

[0017] Figure 2 It is a side structural diagram of the three-edged high-efficiency drill of the utility model.

[0018] Figure 3 It is a schematic diagram of the bottom surface structure of the shank of the three-edged high-efficiency drill of the utility model.

[0019] Main component symbols

[0020] Handle 1 Cutting Department 2 Main cutting edge 3 Secondary cutting edge 4 Chip groove 5 Cutting edge flank 6 Drill tip structure 7 Negative chamfer 8 Chip groove 9 Internal coolant hole 10 Oil tank 11

[0021] The following specific implementation manner will further illustrate the present utility model in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0022] like Figure 1 As shown in FIG. 1 , it is a structural diagram of the drill bit of the three-edged high-efficiency drill of the utility model; Figure 2 As shown, it is a side structural diagram of the three-edge high-efficiency drill of the utility model; Figure 3 The figure shows the bottom surface structure of the shank of the three-edged high-efficiency drill of the present invention.

[0023] Embodiment 1:

[0024] A three-edged high-efficiency drill comprises a tool body having a shank portion 1 and a cutting portion 2, wherein the end face of the cutting portion 2 away from the shank portion 1 is a conical surface, and at least three main cutting edges 3 are arranged on the conical surface, and the side wall of the cutting portion 2 is provided with secondary cutting edges 4 which respectively correspond to the main cutting edges 3 one by one and are spirally arranged with the shank portion 1 as the axis, and a chip groove 5 is provided on one side of the main cutting edge 3, characterized in that: the main cutting edge 3 is a curved design, and the curved surface where the main cutting edge 3 is located is a cutting edge flank 6, and the angle of each cutting edge flank 6 increases successively from the main cutting edge 3 to the side away from the main cutting edge 3, so that the cutting vibration is small and a more stable self-centering effect is achieved.

[0025] The cutting edge flank 6 is based on the tool diameter. The larger the angle of the cutting edge flank 6, the smaller the tool diameter. The tool diameter changes by 2 to 4 mm for every 1° change in the cutting edge flank 6. The minimum angle is between 8° and 10°, and the maximum angle is 18°.

[0026] The main cutting edge 3 extends to the center of the tool body to form a rotating drill tip structure 7, and the top angle of the drill tip structure 7 is between 120° and 150°.

[0027] The main cutting edge 3 is designed as a curve, and the back angle of the main cutting edge 3 decreases from the drill tip to the outside.

[0028] The edge of the main cutting edge 3 away from the drill tip is provided with a negative chamfer 8 for ensuring the strength of the cutting edge and improving the chip breaking function.

[0029] A chip removal groove 9 is provided between the secondary cutting edges 4. The chip removal groove 9 is spirally arranged to improve the chip removal performance during machining while taking into account the rigidity of the tool structure.

[0030] An inner cooling hole 10 is provided between the main cutting edge 3 and the chip removal groove 9 . The inner cooling hole 10 runs through the entire blade body and is spirally arranged with the shank 1 as the axis.

[0031] At least three oil grooves 11 are provided at the bottom end of the shank portion 1 , and the oil grooves 11 correspond to the inner cooling holes 10 . The oil grooves 11 are used to guide the coolant so that the coolant converges to the inner cooling holes 10 to increase the flow rate.

[0032] The cutting part 2 is made of high wear-resistant rod tungsten carbide and a coating containing nitrogen, chromium, aluminum and silicon elements, which greatly improves the durability of the tool.

[0033] The beneficial effects of the utility model are as follows: the utility model proposes a three-edge high-efficiency drill, comprising a tool body having a shank portion 1 and a cutting portion 2, the end face of the cutting portion 2 away from the shank portion 1 being a conical surface, at least three main cutting edges 3 being arranged on the conical surface, the side wall of the cutting portion 2 being provided with secondary cutting edges 4 corresponding one to one to the main cutting edges 3 and spirally arranged with the shank portion 1 as the axis, a chip groove 5 being provided on one side of the main cutting edge 3, the main cutting edge 3 being a curved design, the curved surface where the main cutting edge 3 is located being a cutting edge flank 6, the angle of each cutting edge flank 6 increasing successively from the main cutting edge 3 to the side away from the main cutting edge 3, so that the cutting vibration is small and a more stable self-centering effect is achieved; high wear-resistant rods and coatings are selected to greatly improve the tool durability and improve the overall efficiency by 33%.

[0034] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A three-edge high-efficiency drill, comprising a tool body having a shank portion (1) and a cutting portion (2), wherein the end surface of the cutting portion (2) away from the shank portion (1) is a conical surface, and at least three main cutting edges (3) are arranged on the conical surface, and the side wall of the cutting portion (2) is provided with secondary cutting edges (4) which correspond to the main cutting edges (3) one by one and are spirally arranged with the shank portion (1) as the axis, and a chip groove (5) is provided on one side of the main cutting edge (3), characterized in that: The main cutting edge (3) is designed as a curve, the curved surface on which the main cutting edge (3) is located is a cutting edge flank (6), and the angle of each cutting edge flank (6) increases in sequence from the main cutting edge (3) to a side away from the main cutting edge (3), thereby reducing cutting vibration and achieving a more stable self-centering effect.

2. The three-edge high-efficiency drill according to claim 1, characterized in that: The cutting edge flank (6) is shaped according to the tool diameter. When the angle of the cutting edge flank (6) is larger, the tool diameter is smaller. The tool diameter changes by 2 to 4 mm for every 1° change in the cutting edge flank (6). The minimum angle is between 8° and 10°, and the maximum angle is 18°.

3. The three-edge high-efficiency drill according to claim 1, characterized in that: The main cutting edge (3) extends to the center of the tool body to form a rotating drill tip structure (7), and the top angle of the drill tip structure (7) is between 120° and 150°.

4. The three-edge high-efficiency drill according to claim 1, characterized in that: The back angle of the main cutting edge (3) decreases from the drill tip outwards.

5. The three-edge high-efficiency drill according to claim 1, characterized in that: The edge of the main cutting edge (3) away from the drill tip is provided with a negative chamfer (8) for ensuring the strength of the cutting edge and improving the chip breaking function.

6. The three-edge high-efficiency drill according to claim 1, characterized in that: A chip removal groove (9) is provided between the secondary cutting edges (4); the chip removal groove (9) is spirally arranged, thereby improving the chip removal performance during machining while taking into account the rigidity of the tool structure.

7. The three-edge high-efficiency drill according to claim 6, characterized in that: An inner cooling hole (10) is provided between the main cutting edge (3) and the chip removal groove (9); the inner cooling hole (10) runs through the entire blade body and is spirally arranged with the shank (1) as the axis.

8. The three-edge high-efficiency drill according to claim 7, characterized in that: At least three oil grooves (11) are provided at the bottom end of the shank portion (1), and the oil grooves (11) correspond to the inner cooling holes (10). The oil grooves (11) are used to guide the coolant so that the coolant converges to the inner cooling holes (10) to increase the flow rate.

9. The three-edge high-efficiency drill according to claim 1, characterized in that: The cutting part (2) uses high-wear-resistant rod material and coating, which greatly improves the durability of the tool.

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