Efficient three-blade drill

Abstract

The efficient three-blade drill comprises a cutter body with a cutter handle portion and a cutting portion, the cutting portion comprises a spiral face and a conical face, the spiral face is connected with the conical face and the cutter handle portion, the conical face is arranged on the end face, away from the cutter handle portion of the cutting portion, of the cutter handle portion, and three main cutting blades 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, a main chip groove is formed in one side of each main cutting edge, a first chip groove and a second chip groove are formed in one side of each main chip groove, the main cutting edges are in curve design, and the first chip groove and the second chip groove are in curve design. The curved surface between the main cutting edge and the auxiliary cutting edge is the main cutting surface, and the angle of each main cutting surface is gradually reduced from the main cutting edge to one side far away from the auxiliary cutting edge, so that the cutting resistance is reduced, the abrasion of the cutting edges is reduced, the service life of the drill bit is prolonged, and the processing efficiency is improved.

Description

Technical Field

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

[0002] The main failure modes of drills for difficult-to-process materials are: built-up edge; severe damage to the tip core; severe damage to the flank; chipping of the main cutting edge; rapid wear of the support guide of the drill back cone, etc.; conventional two-edge drills are prone to hole deviation, burrs on the hole mouth, and poor surface roughness of the processed holes. In addition, the use of conventional two-edge drills to process difficult-to-process materials can easily result in low tool life, high unit cost, low positioning accuracy, and easy deviation of drilling holes.

[0003] The utility model patent with announcement number CN211218844U discloses a three-edged drill bit for difficult-to-process materials in aviation, comprising: a drill bit body; the drill bit body comprises: a shank and a blade connected to one end of the shank; wherein the blade is provided with three cutting edges; each cutting edge is spirally arranged along the central axis of the drill bit body, and one end of the main cutting edge surface of each cutting edge intersects with the axis of the drill bit body to form a drill tip; in addition, the three-edged drill bit significantly reduces cutting resistance, reduces wear on the cutting edge, and improves the service life of the drill bit by obliquely arranging the main and secondary cutting edge surfaces and setting the groove surface of the chip groove into an arc shape.

[0004] However, the chip groove of the above technical solution is not limited, and in the actual processing process, the chip groove has an important influence on the drilling resistance and drilling efficiency.

[0005] In a three-edge drill with a relatively small chip groove width and cross-sectional area, chip blockage is difficult to suppress and the tool life needs to be further improved. For this reason, the utility model proposes a high-efficiency three-edge drill, which can significantly reduce cutting resistance, reduce wear on the cutting edge, and improve the service life of the drill. On the basis of reducing cutting resistance, the processing temperature is also reduced to avoid the temperature of difficult-to-process materials being too high and causing the workpiece surface to harden, effectively reducing the failure mode of the three-edge drill in difficult-to-process materials and improving processing efficiency. Utility Model Content

[0006] In view of this, in order to solve the above problems, the utility model proposes a high-efficiency three-edge drill, including a tool body with a shank portion 1 and a cutting portion 2, characterized in that: the cutting portion 2 includes a spiral surface 3 and a conical surface 4, the spiral surface 3 connects the conical surface 4 and the shank portion 1, the conical surface 4 is arranged at the end face of the shank portion 1 away from the cutting portion 2, three main cutting edges 51 are arranged on the conical surface 4, the side walls of the cutting portion 2 are respectively provided with secondary cutting edges 52 corresponding to the main cutting edges 51 one by one and spirally arranged with the shank portion 1 as the axis, a main chip groove 6 is provided on one side of the main cutting edge 51, a first chip groove 61 and a second chip groove 62 are provided on one side of the main chip groove 6, the main cutting edge 51 is designed as a curve, the curved surface between the main cutting edge 51 and the secondary cutting edge 52 is the main cutting surface 5, and the angle of each of the main cutting surfaces 5 decreases successively from the main cutting edge 51 to the side away from the secondary cutting edge 52.

[0007] Furthermore, the main cutting edge 51 extends to the center of the tool body to form a rotating drill tip structure 8, the top angle of the drill tip structure 8 is between 128° and 152°, and the main cutting edge 51 changes in an arc spiral of r=1° from the top angle of the drill tip structure 8 to the direction away from the drill tip structure 8.

[0008] Furthermore, the first chip removal groove 61 has a small surface and an axial angle of 35°, so as to guide the chips into the second chip removal groove 62 .

[0009] Furthermore, the second chip groove 62 has a surface larger than that of the first chip groove 61 , and an axial angle of 55°, so as to guide the chips into the main chip groove 6 .

[0010] Furthermore, the main chip removal groove 6 is spirally arranged, and the main chip removal groove 6 extends from the top of the cutting part 2 to the tail of the cutting part 2, and is used to discharge the debris.

[0011] Furthermore, the main cutting surface 5 is provided with a chamfer 7 at the edge of the drill tip structure 8 away from the main cutting edge 51. The chamfer 7 connects the spiral surface 3 and the main cutting surface 5, and is used to reduce defects such as burrs and cracks on the surface of the processed parts, making the edge of the workpiece smoother and flatter, and also has supporting and cutting functions.

[0012] Furthermore, the chamfered edge 7 includes a cutting edge 71, a hole forming edge 72 and a mating surface forming edge 73, the cutting edge 71 has an axial angle of 45°, the hole forming edge 72 is arranged in an arc shape, the axial angle of the hole forming edge 72 is 6°, the radial angle is 2.5°, and the mating surface forming edge 73 is the surface where the chamfered edge 7 is located.

[0013] Furthermore, in the radial direction, the outer circumference of the chamfer 7 is larger than the outer circumference of the helical surface 3 , and the mating surface forming edge 73 of the chamfer 7 gradually decreases from the cutting edge 71 to the side away from the cutting edge 71 .

[0014] Furthermore, in the radial direction, the outer circumference of the shank portion 1 is larger than the outer circumference of the helical surface 3 .

[0015] The beneficial effects of the utility model are as follows: the utility model proposes a high-efficiency three-edge drill, comprising a tool body having a shank portion 1 and a cutting portion 2, the cutting portion 2 comprising a spiral surface 3 and a conical surface 4, the spiral surface 3 connecting the conical surface 4 and the shank portion 1, the conical surface 4 being arranged at the end face of the shank portion 1 away from the cutting portion 2, three main cutting edges 51 being arranged on the conical surface 4, the side walls of the cutting portion 2 being respectively provided with secondary cutting edges 52 corresponding to the main cutting edges 51 one by one and spirally arranged with the shank portion 1 as the axis, a main chip groove 6 being arranged on one side of the main cutting edge 51, a first chip groove 61 and a second chip groove 62 being arranged on one side of the main chip groove 6, the main cutting edge 51 being of curved design, the curved surface between the main cutting edge 51 and the secondary cutting edge 52 being the main cutting surface 5, the angle of each of the main cutting surfaces 5 decreasing successively from the main cutting edge 51 to the side away from the secondary cutting edge 52, thereby reducing cutting resistance, reducing wear on the cutting edge, increasing the service life of the drill bit, and improving machining efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the overall structure diagram of the high-efficiency three-edge drill of the utility model.

[0017] Figure 2 The drill bit structure diagram of the high-efficiency three-edge drill of the utility model.

[0018] Figure 3 It is a schematic diagram of the radial structure of the drill bit of the high-efficiency three-edge drill of the utility model.

[0019] Description of main component symbols:

[0020] Shank part 1, cutting part 2, spiral surface 3, conical surface 4, main cutting edge 51, secondary cutting edge 52, main chip groove 6, first chip groove 61, second chip groove 62, main cutting surface 5, drill tip structure 8, chamfer 7, cutting part edge 71, hole forming edge 72, and mating surface forming edge 73.

[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 high-efficiency three-edged drill of the utility model; Figure 2 As shown in FIG. 1 , it is a side structural diagram of the high-efficiency three-edge drill of the utility model; Figure 3 The figure is a schematic diagram of the bottom surface structure of the shank of the high-efficiency three-edged drill of the utility model. Example

[0023] A high-efficiency three-edge drill comprises a tool body having a shank portion 1 and a cutting portion 2, wherein the cutting portion 2 comprises a spiral surface 3 and a conical surface 4, wherein the spiral surface 3 connects the conical surface 4 and the shank portion 1, wherein the conical surface 4 is arranged at the end face of the shank portion 1 away from the cutting portion 2, and wherein three main cutting edges 51 are arranged on the conical surface 4, wherein the side walls of the cutting portion 2 are respectively provided with secondary cutting edges 52 which correspond one to one with the main cutting edges 51 and are spirally arranged with the shank portion 1 as the axis, wherein a main chip groove 6 is provided on one side of the main cutting edge 51, wherein a first chip groove 61 and a second chip groove 62 are provided on one side of the main cutting edge 51, wherein the main cutting edge 51 is designed as a curve, wherein the curved surface between the main cutting edge 51 and the secondary cutting edge 52 is the main cutting surface 5, and wherein the angle of each main cutting surface 5 decreases in sequence from the main cutting edge 51 to the side away from the secondary cutting edge 52.

[0024] The main cutting edge 51 extends to the center of the tool body to form a rotating drill tip structure 8. The top angle of the drill tip structure 8 is between 128° and 152°, and the top angle changes from 128° to 152°. The small top angle has a strong centering force, and the large top angle has a strong chip cutting force. The change in the top angle also brings about an R-shaped change in chip splitting. The main cutting edge 51 changes in an arc spiral of r=1° from the top angle of the drill tip structure 8 to the part away from the drill tip structure 8, so that the metal chips of the chip discharge groove are appropriately curled and more easily become a shorter curled shape without needle-like protrusions, and then are discharged smoothly, and the chip discharge performance is effectively improved.

[0025] The first chip removal groove 61 has a small surface and an axial angle of 35°, and is used to guide the chips into the second chip removal groove 62 .

[0026] The second chip groove 62 has a larger surface than the first chip groove 61 and an axial angle of 55°, and is used to guide the chips into the main chip groove 6 .

[0027] The main chip removal groove 6 is spirally arranged and extends from the top of the cutting part 2 to the tail of the cutting part 2 for discharging chips.

[0028] The main cutting surface 5 is provided with a chamfer 7 at the edge of the drill tip structure 8 away from the main cutting edge 51. The chamfer 7 connects the spiral surface 3 and the main cutting surface 5, and is used to reduce defects such as burrs and cracks on the surface of the processed parts, making the edge of the workpiece smoother and flatter, and also has supporting and cutting functions.

[0029] The chamfered edge 7 comprises a cutting edge 71, a hole forming edge 72 and a mating surface forming edge 73. The axial angle of the cutting edge 71 is 45°. The hole forming edge 72 is arranged in an arc shape. The axial angle of the hole forming edge 72 is 6° and the radial angle is 2.5°. The mating surface forming edge 73 is the surface where the chamfered edge 7 is located.

[0030] In the radial direction, the outer circumference of the chamfer 7 is larger than the outer circumference of the helical surface 3 , and the mating surface forming edge 73 of the chamfer 7 gradually decreases from the cutting edge 71 to the side away from the cutting edge 71 .

[0031] In the radial direction, the outer circumference of the shank portion 1 is larger than the outer circumference of the helical surface 3 .

[0032] The beneficial effects of the utility model are as follows: the utility model proposes a high-efficiency three-edge drill, comprising a tool body having a shank portion 1 and a cutting portion 2, the cutting portion 2 comprising a spiral surface 3 and a conical surface 4, the spiral surface 3 connecting the conical surface 4 and the shank portion 1, the conical surface 4 being arranged at the end face of the shank portion 1 away from the cutting portion 2, three main cutting edges 51 being arranged on the conical surface 4, the side walls of the cutting portion 2 being respectively provided with secondary cutting edges 52 corresponding to the main cutting edges 51 one by one and spirally arranged with the shank portion 1 as the axis, a main chip groove 6 being arranged on one side of the main cutting edge 51, a first chip groove 61 and a second chip groove 62 being arranged on one side of the main chip groove 6, the main cutting edge 51 being of curved design, the curved surface between the main cutting edge 51 and the secondary cutting edge 52 being the main cutting surface 5, the angle of each of the main cutting surfaces 5 decreasing successively from the main cutting edge 51 to the side away from the secondary cutting edge 52, thereby reducing cutting resistance, reducing wear on the cutting edge, increasing the service life of the drill bit, and improving machining efficiency.

[0033] 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 high-efficiency three-edged drill, comprising a tool body having a shank portion (1) and a cutting portion (2), characterized in that: The cutting portion (2) comprises a spiral surface (3) and a conical surface (4), the spiral surface (3) connecting the conical surface (4) and the shank portion (1), the conical surface (4) being arranged at the end face of the shank portion (1) away from the cutting portion (2), the conical surface (4) being provided with three main cutting edges (51), the side walls of the cutting portion (2) being respectively provided with secondary cutting edges (52) corresponding one to one with the main cutting edges (51) and being spirally arranged with the shank portion (1) as an axis, a main chip groove (6) being provided on one side of the main cutting edge (51), a first chip groove (61) and a second chip groove (62) being provided on one side of the main chip groove (6), the main cutting edge (51) being designed in the form of a curve, the curved surface between the main cutting edge (51) and the secondary cutting edge (52) being the main cutting surface (5), the angle of each main cutting surface (5) decreasing in sequence from the main cutting edge (51) to the side away from the secondary cutting edge (52).

2. The high-efficiency three-edge drill according to claim 1, characterized in that: The main cutting edge (51) extends to the center of the tool body to form a rotating drill tip structure (8), the top angle of the drill tip structure (8) is between 128° and 152°, and the main cutting edge (51) changes in an arc spiral with an angle of r=1° from the top angle of the drill tip structure (8) to a position away from the drill tip structure (8).

3. The high-efficiency three-edge drill according to claim 1, characterized in that: The first chip removal groove (61) has a small surface and an axial angle of 35°, and is used to guide chips into the second chip removal groove (62).

4. The high-efficiency three-edge drill according to claim 1, characterized in that: The second chip removal groove (62) has a larger surface than the first chip removal groove (61) and an axial angle of 55°, and is used to guide the chips into the main chip removal groove (6).

5. The high-efficiency three-edge drill according to claim 1, characterized in that: The main chip removal groove (6) is spirally arranged, and the main chip removal groove (6) extends from the top of the cutting part (2) to the tail of the cutting part (2), and is used to discharge chips.

6. The high-efficiency three-edge drill according to claim 1, characterized in that: The main cutting surface (5) is provided with a chamfer (7) at an edge of the drill tip structure (8) away from the main cutting edge (51), and the chamfer (7) connects the helical surface (3) and the main cutting surface (5).

7. The high-efficiency three-edge drill according to claim 6, characterized in that: The chamfered edge (7) comprises a cutting edge (71), a hole forming edge (72) and a matching surface forming edge (73); the cutting edge (71) has an axial angle of 45°; the hole forming edge (72) is arranged in an arc shape; the hole forming edge (72) has an axial angle of 6° and a radial angle of 2.5°; the matching surface forming edge (73) is the surface where the chamfered edge (7) is located.

8. The high-efficiency three-edge drill according to claim 6, characterized in that: In the radial direction, the outer circumference of the chamfer (7) is larger than the outer circumference of the helical surface (3), and the mating surface forming edge (73) of the chamfer (7) gradually decreases from the cutting edge (71) to the side away from the cutting edge (71).

9. The high-efficiency three-edge drill according to claim 1, characterized in that: In the radial direction, the outer circumference of the shank portion (1) is larger than the outer circumference of the helical surface (3).

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