Drill bit and machining equipment

Abstract

The utility model belongs to the technical field of precision machining, and particularly discloses a drill bit and machining equipment. Wherein the drill bit comprises a drill body, a drill tip and a drill handle; the drill tip comprises two main cutting edges and a chisel edge; the main cutting edge comprises a front cutter surface and a rear cutter surface; a plurality of sections of cutting edges are arranged between the front cutter surface and the rear cutter surface; the cutting edges are chamfered surfaces formed by chamfering intersecting lines of the front cutter faces and the rear cutter faces, and cutting angles are formed between the multiple cutting edges and the rear cutter faces; the cutting angles of the multiple cutting edges are sequentially increased in the direction from a drill core of the drill tip to the outer side face of the drill body. The rear tool face is provided with a stepped edge and a plurality of first chip grooves, and the first chip grooves are communicated with the spiral groove of the drill body. The cutting angles of the multiple cutting edges are gradually increased outwards in sequence, the torque borne by the cutting edges is also increased, the torque borne by the whole drill bit is more uniform by adjusting the cutting angles of the multiple cutting edges, abrasion of the main cutting edges is more uniform, and the service life of the drill bit is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of precision machining, in particular to a drill bit and a machining device. Background Art

[0002] With the rapid development of the semiconductor industry, in semiconductor-related industries, PCD micro drill bits are usually required to machine precision small holes, and there are high requirements for the machining quality of the small holes. Traditional carbide micro drill bits cannot meet the usage requirements. When the existing drill bits are cutting, the torsion force received by the cutting edge gradually decreases from the middle to the outside, and the cutting edge of the main cutting edge is set at the same angle, resulting in different torsion forces between the cutting edge on the outside of the main cutting edge and the cutting edge near the center. The cutting edge near the center of the main cutting edge wears more seriously, affecting the service life of the drill bit. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a drill bit to solve the technical problem that the cutting edge near the center of the main cutting edge in the prior art wears more seriously, affecting the service life of the drill bit.

[0004] To achieve the above purpose, the first aspect of the utility model provides a drill bit, which includes: a drill body, a drill tip, and a drill shank;

[0005] The drill tip is arranged at one end of the drill body; the drill body has a spiral groove;

[0006] The drill tip includes two centrally symmetric main cutting edges and a chisel edge;

[0007] The main cutting edge includes a rake face and a flank face; there are multiple sections of cutting edges between the rake face and the flank face; the cutting edge is a chamfered surface formed by chamfering the intersection line of the rake face and the flank face, and each section of the cutting edge and the flank face have a cutting angle; in the direction from the drill core of the drill tip to the outer side surface of the drill body, the cutting angles of the multiple sections of the cutting edges increase in sequence;

[0008] The flank face of one of the main cutting edges intersects with the flank face of the other main cutting edge to form the chisel edge; and the flank face is provided with stepped edges along the extending direction of both ends of the chisel edge;

[0009] Preferably, a plurality of first chip flutes communicating with the spiral flutes are provided on the rear flank. The rear flank includes a first rear flank and a second rear flank, the second rear flank intersects with the first rear flank, the first rear flank intersects with the front flank, and the cutting edge is located at the intersection line of the first rear flank and the front flank; the second rear flank is located on the side of the first rear flank away from the cutting edge; the first chip flutes are provided on the second rear flank and communicate with the intersection of the first rear flank and the second rear flank, and the first rear flank of one of the main cutting edges intersects with the second rear flank of the other main cutting edge to form a semi-transverse edge, and the two semi-transverse edges intersect at the center of the drill tip to form the continuous transverse edge.

[0010] Preferably, a plurality of second chip flutes are further provided on the second rear flank, the second chip flutes are provided on the outer peripheral edge of the second rear flank away from the transverse edge, and the first chip flutes are provided between the second chip flutes and the transverse edge.

[0011] Preferably, the sum of the rake angle and the clearance angle of the main cutting edge is The angle between the chamfered surface and the rear flank is The chamfer angle of the chamfered surface is

[0012] Wherein,

[0013] Preferably, the angle between each chamfered surface of the main cutting edge and the rear flank is equal, and the range of the angle between the chamfered surface and the rear flank is 90°-150°;

[0014] The length L of each cutting edge is: L = (38% × D) / n;

[0015] The diameter D of the drill tip is: D = 2 × L11 × sin(θ / 2);

[0016] Wherein, n is the number of segments of the cutting edge of one of the main cutting edges, L11 is the straight-line length between the vertex of the drill tip and the intersection point of the main cutting edge and the outer edge; θ is the drill tip angle.

[0017] Preferably, the shape of the first chip flute can be linear, wavy or arc-shaped.

[0018] Preferably, stepped tooth gaps are provided along the extending directions of both ends of the transverse edge of the drill tip; the stepped tooth gaps are recessed towards the length direction of the drill body; the stepped tooth gaps intersect with the first rear flank to form the stepped cutting edge.

[0019] Preferably, the maximum width of the first rear flank is one-half of the core thickness of the drill body;

[0020] The number of steps of the stepped clearance is n1 = (55% × D1) / (2 × L9);

[0021] where D1 is the core thickness of the drill body, and L9 is the width of the stepped cutting edge, and 0.001 ≤ L9 ≤ 0.4.

[0022] Preferably, the stepped cutting edge extends along the first flank face to the outer edge of the drill tip; and the stepped cutting edge has multiple segments of stepped parallel cutting edges; one segment of the stepped parallel cutting edge and one segment of the cutting edge form a parallel step.

[0023] Preferably, the drill body is provided with a spiral land, the spiral land has a round cutting edge, and a land cutting edge is arranged outside the round cutting edge.

[0024] Preferably, a cutting edge groove is arranged outside the round cutting edge, and the cutting edge groove and the outer side face of the spiral land form the land cutting edge.

[0025] Preferably, the width of the round cutting edge of the spiral land is 0.005 ≤ L7 ≤ 0.2; the width of the cutting edge groove is 0.002 ≤ L6 ≤ 0.08, and the depth of the cutting edge groove is 0.002 ≤ L5 ≤ 0.08;

[0026] wherein, L6 = 40% × L7.

[0027] Preferably, a land step is arranged outside the spiral land.

[0028] Preferably, the drill shank is connected to the drill body in a direction away from the drill tip; the drill tip is sequentially divided into multiple segments of drill tip segments along the direction from the drill tip vertex to the drill shank, and the drill tip angles of the multiple segments of drill tip segments arranged in sequence along the direction from the drill tip vertex to the drill shank gradually decrease.

[0029] The second aspect of the present utility model further provides a processing device, which includes: a power device, a clamping device, and a drill bit as described above, the clamping device clamps the drill bit, and the power device drives the drill bit to rotate through the clamping device.

[0030] The drill bit provided by the present utility model and the processing equipment having the drill bit have the following beneficial effects: The cutting angles of multiple said cutting edges increase sequentially from one end of the chisel edge outwards. The cutting force of the cutting edges further outwards is greater, and the torsion received will also increase. The torsion received by the cutting edges near the center during cutting is less than that received by the cutting edges near the outside of the main cutting edge. By adjusting the cutting angles of multiple segments of cutting edges, the torsion received by the entire drill bit can be made more uniform, the wear of the main cutting edge can be made more uniform, and the service life of the drill bit can be improved. Since a stepped edge extending to the chisel edge is provided, the effective cutting length of the chisel edge will be shortened to reduce the drilling resistance. The stepped edge is provided on the flank face, so that a cutting edge is added on the flank face to enhance the cutting ability, enabling the stepped edge to assist the cutting edge of the main cutting edge in cutting, reducing the friction between a single main cutting edge and the material, reducing the wear of the cutting edge of the main cutting edge, and improving the tool life. Secondly, during the drilling process, since the temperature of the drill tip is the highest, the chips being squeezed on the flank face easily causes the temperature of the drill tip to decrease slowly. The chips on the flank face can be discharged through the first chip discharge groove to improve the heat dissipation efficiency of the drill tip and increase the chip holding capacity of the drill tip.

[0031] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic structural diagram of the drill bit according to an embodiment of the present utility model;

[0033] Figure 2 is a schematic structural diagram of a drill tip having stepped tooth gaps according to an embodiment of the present utility model;

[0034] Figure 3 is a schematic diagram for identifying the rake angle and flank angle of the main cutting edge according to an embodiment of the present utility model;

[0035] Figure 4 is Figure 2 a schematic diagram of the included angles between the chamfered surfaces of sections A, B, and C and the first flank face in

[0036] Figure 5 is Figure 2 a schematic diagram of the length of the cutting edge in

[0037] Figure 6 is a schematic diagram of the diameter D of the drill tip and θ being the drill tip angle;

[0038] Figure 7 is a schematic diagram of the core thickness D1 of the drill body, the width L9 of the stepped edge, and the width of the stepped tooth gap;

[0039] Figure 8It is a schematic diagram of the drop H1 of a single step of the stepped backlash and the depression depth H2 of the backlash;

[0040] Figure 9 It is a schematic diagram of the drill tip structure where the stepped edge of this embodiment of the utility model extends to the outer edge of the drill tip;

[0041] Figure 10 It is a schematic diagram of the drill body structure of this embodiment of the utility model;

[0042] Figure 11 It is a schematic diagram of the structure of the spiral cutting edge band and the cutting edge band step of this embodiment of the utility model;

[0043] Figure 12 It is a schematic diagram of the cross-sectional structure of the drill body of this embodiment of the utility model;

[0044] Figure 13 It is a schematic diagram of the drill tip structure with multiple drill tip ends.

[0045] In the figure, 100, drill body; 110, spiral cutting edge band; 120, round cutting edge; 130, cutting edge of the cutting edge band; 140, cutting edge groove; 150, cutting edge band step; 200, drill tip; 210, main cutting edge; 211, rake face; 212, first flank face; 213, second flank face; 214, cutting edge; 215, stepped edge; 2151, stepped parallel edge; 216, first chip flute; 217, second chip flute; 218, chamfered surface; 219, flank face; 220, chisel edge; 230, stepped backlash; 240, drill tip section; 300, drill shank. Detailed implementation manners

[0046] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0047] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0048] In the description of the present utility model, the meaning of "a number of" is one or more, the meaning of "a plurality of" is more than two, and understandings such as "greater than", "less than", "exceeding", etc. do not include the corresponding number, while understandings such as "above", "below", "within", etc. include the corresponding number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0049] In the description of the present utility model, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.

[0050] Please refer to Figures 1 to 13 together, and now the drill bit provided by the embodiment of the present utility model will be described.

[0051] As Figures 1 to 2 shown, the drill bit of the embodiment of the present utility model includes: a drill body 100 and a drill tip 200;

[0052] The drill tip 200 is provided at one end of the drill body 100; the drill body 100 has a spiral groove 160 passing through the drill tip 200;

[0053] The drill tip 200 includes two main cutting edges 210 and a chisel edge 220; the two main cutting edges 210 are centrosymmetric about the center of the drill tip 200, and the chisel edge 220 is located between the two main cutting edges 210;

[0054] Each main cutting edge 210 includes a rake face 211 and a flank face 219; there are multiple cutting edges 214 provided between the rake face 211 and the flank face 219; the cutting edge 214 is a chamfered surface 218 formed by chamfering the intersection line of the rake face 211 and the flank face 219, and each single cutting edge 214 has a cutting angle with the flank face 219; in the direction from the drill core of the drill tip 200 to the outer side surface of the drill body 100, the cutting angles of the multiple cutting edges 214 increase in sequence; the position of the drill core of the drill tip 200 can be referred to Figure 7 the dotted circle at D1 in

[0055] The flank faces 219 of one of the main cutting edges 210 intersect with the flank faces 219 of the other main cutting edge 210, and the intersection position forms the chisel edge 220; and step edges 215 are provided along the extending directions at both ends of the chisel edge 220 on the flank face 219. Multiple first chip flutes 216 are provided on the flank face 219, and the first chip flutes 216 communicate with the spiral groove 160.

[0056] In this embodiment, as Figure 2As shown, there are two main cutting edges 210. The two main cutting edges 210 and the chisel edge 220 are symmetrically arranged about the central axis of the drill body 100. The flank face 219 of one main cutting edge 210 intersects with the flank face of the other main cutting edge 210 to form the chisel edge 220.

[0057] Multiple cutting edges 214 are formed between the rake face 211 and the flank face 219. As Figure 2 shown, they are divided into section A, section B, and section C. Moreover, the cutting angles of the multiple cutting edges 214 increase successively along the direction from the drill core of the drill tip 200 to the outer side face of the drill body 100. That is, the cutting angle of section A is the largest. That is, the cutting force of the cutting edge 214 closer to the outside is greater, and the torsion received will also increase. Therefore, the torsion received by the cutting edge 214 closer to the center during cutting is less than that received by the cutting edge 214 closer to the outside of the main cutting edge 210. Then, by adjusting the cutting angles of the multiple cutting edges 214, the torsion received by the entire drill bit can be made more uniform, the wear of the main cutting edge 210 can be made more uniform, and the service life of the drill bit can be improved.

[0058] Furthermore, a stepped edge 215 extending to the chisel edge 220 is provided on the flank face 219. On a drill tip 200 of the same size, since the stepped edge 215 extending to the chisel edge 220 is provided, the effective cutting length of the chisel edge 220 will be shortened to reduce the drilling resistance. The stepped edge 215 is provided on the flank face 219, so a cutting edge is added on the flank face 219 to enhance the cutting ability, enabling the stepped edge 215 to assist the cutting edge 214 of the main cutting edge 210 in cutting, reducing the friction between a single main cutting edge 210 and the material, reducing the wear of the cutting edge 214 of the main cutting edge 210, improving the tool life, and at the same time enabling the drill tip 200 to have a centering function by itself, facilitating the alignment of the drill bit with the workpiece center.

[0059] Due to the addition of the stepped edge 215, for convenient chip evacuation, a first chip evacuation groove 216 communicating with the spiral groove 160 is provided on the flank face 219. During the drilling process, since the temperature of the drill tip 200 is the highest, if the chips are squeezed on the flank face 219, it is easy to cause the temperature of the drill tip 200 to decrease slowly. Therefore, the chips on the flank face 219 can be discharged through the first chip evacuation groove 216 on the flank face 219 to improve the heat dissipation efficiency of the drill tip 200 and increase the chip holding capacity of the drill tip 200.

[0060] In some embodiments of the present utility model, the flank face 219 includes a first flank face 212 and a second flank face 213. The second flank face 213 intersects with the first flank face 212. The first flank face 212 intersects with the rake face 211, and the cutting edge 214 is a chamfered surface of the intersection line of the first flank face 212 and the rake face 211. The second flank face 213 is located on the side of the first flank face 212 away from the cutting edge 214. The first chip flute 216 is provided on the second flank face 213, and the first chip flute 216 communicates with the intersection of the first flank face 212 and the second flank face 213. The first flank face 212 of one of the main cutting edges 210 intersects with the second flank face 213 of the other main cutting edge 210 to form a semi-transverse edge, and the two semi-transverse edges intersect at the center of the drill tip to form the continuous transverse edge 220. By dividing the flank face 219 into the first flank face 212 and the second flank face 213, the contact between the second flank face 213 and the workpiece is reduced, the friction is reduced, the wear is reduced, and it is convenient for the chips on the first flank face 212 to be drained into the spiral flute 160 through the first chip flute 216, facilitating the discharge of the chips at the drill tip 200.

[0061] In some embodiments of the present utility model, referring to Figure 2 , a plurality of second chip flutes 217 are further provided on the second flank face 213. The second chip flutes 217 are provided on the outer peripheral edge of the second flank face 213 away from the transverse edge 220, and the first chip flute 216 is provided between the second chip flute 217 and the transverse edge 220. During the drilling process, the heat accumulation at the outer peripheral edge of the intersection corner of the second flank face 213 and the first flank face 212 of the drill tip 200 is the highest. By providing the second chip flutes 217 on the outer edge of the second flank face 213, the contact between the second flank face 213 and the waste chips can be reduced, which is beneficial to chip evacuation, increases the contact area between the coolant and the drill tip 200, reduces the drilling heat, and thus quickly discharges the heat accumulated at the corner, and also appropriately increases the chip capacity of the drill tip 200.

[0062] In some embodiments of the present utility model, referring to Figures 2 to 4 , each chamfered surface 218 of the main cutting edge 210 forms a plurality of cutting edges 214. The sum of the rake angle and the clearance angle of the main cutting edge is The included angle between the chamfered surface 218 and the flank face 219 is Here, the first flank face 212 is used as the measurement reference for the flank face 219. The chamfer angle of the chamfered surface 218 is

[0063] Among them,

[0064] Such asFigure 3 As shown, α is the front angle of the cutting edge, β is the back angle of the cutting edge, and the section plane is the plane where the cutting edge is perpendicular to the top angle of the drill tip.

[0065] The angle between the chamfered surface and the first flank surface is Figure 4 As shown, α1 is the angle between the chamfered edge of the A-section cutting edge and the first flank face, α2 is the angle between the chamfered edge of the B-section cutting edge and the first flank face, and α3 is the angle between the chamfered edge of the C-section cutting edge and the first flank face. The cutting edge can be multi-section, α n It is the included angle between the chamfered surface of the plurality of cutting edges and the first flank surface. The chamfered angle of the chamfered surface is the processing angle of the chamfered surface.

[0066] It should be noted that the optimal value of the angle between the chamfered surface and the first back cutting edge is 120°. Under this optimal value, the drill bit is made of PCD material and is used to cut hard and brittle materials, so that the cutting edge is evenly stressed and wears evenly, thereby improving the life of the tool.

[0067] In some embodiments of the present invention, referring to Figure 4 , Figure 5 , the included angles between each chamfered surface 218 of the main cutting edge 210 and the flank surface 219 are equal, that is, α1=α2=α3=α n ; and the angle between the chamfered surface and the back cutting surface 219 is in the range of 90°-150°;

[0068] The length L of each cutting edge is: L = (38% × D) / n;

[0069] The diameter D of the drill tip is: D=2×L11×sin(θ / 2);

[0070] Among them, Figure 5 , Figure 6 As shown, n is the number of segments of the cutting edge of the main cutting edge 210, L11 is the straight line length between the drill tip vertex and the intersection of the main cutting edge 210 and the outer edge; θ is the drill tip angle.

[0071] The length of each cutting edge can be calculated by the above formula to better process the drill bit.

[0072] In some embodiments of the present invention, the shape of the first chip removal groove 216 can be linear, wavy or arc-shaped. When the first chip removal groove 216 is arc-shaped, the center of the arc is located on the central axis of the drill body 100. The shape of the first chip removal groove 216 can be modified according to specific needs to adapt to different chip removal situations.

[0073] In some embodiments of the present invention, Figure 2As shown, a stepped tooth gap 230 is provided along the extending direction of both ends of the chisel edge 220; that is, the stepped tooth gap 230 is provided at both ends of the chisel edge 220, and the stepped tooth gap 230 is recessed toward the length direction of the drill body 100; the stepped tooth gap 230 intersects with the first flank 212 of one of the main cutting edges 210 to form the stepped edge 215, and the stepped tooth gap 230 intersects with the second flank 213 of the other main cutting edge 210, also forming the stepped edge 215. Then, the stepped tooth gap 230 is directly machined at both ends of the chisel edge 220 to directly shorten the length of the chisel edge 220 and reduce the drilling resistance. However, the reduction of the chisel edge 220 generally affects the core thickness of the drill body 100, and the core thickness affects the fracture strength of the drill body 100. To reduce the chisel edge 220 and at the same time reduce the influence of the reduced core thickness on the fracture strength of the drill body 100, the structure of the chisel edge 220 is reduced through the stepped tooth gap 230, the size of the chisel edge 220 is reduced, and at the same time the influence on the fracture strength of the drill bit is reduced, and the function of chip breaking can be achieved at the same time.

[0074] In some embodiments of the present invention, as Figure 7 、 Figure 8 shown, the maximum width of the first flank 212 is one-half of the core thickness of the drill body 100;

[0075] The number of steps of the stepped tooth gap 230 is n1 = (55% × D1) / (2 × L9);

[0076] where D1 is the core thickness of the drill body, and L9 is the width of the stepped edge, 0.001 ≤ L9 ≤ 0.4.

[0077] As Figure 7 、 Figure 8 shown, the width of the stepped edge is 0.001 ≤ L9 ≤ 0.4; the width of the tooth gap is 0.005 ≤ L10 ≤ 0.26; the drop of a single step is 0.0005 ≤ H1 ≤ 0.02; the recessed depth of the tooth gap is 0.0024 ≤ H2 ≤ 0.096; the length units of the above L9, L10, H1, and H2 ranges are all millimeters.

[0078] The relationship between the width of the tooth gap and the core thickness is L10 = 43% × D1;

[0079] The relationship between the recessed depth and the core thickness is H2 = 16% × D1.

[0080] The parameters of the core thickness and the stepped tooth gap calculated by the above formulas can effectively prevent the drill bit from breaking during processing.

[0081] It should be noted that, as Figure 2As shown, the stepped cutting edges 215 are symmetrically arranged with the transverse cutting edge 220 as the center. The stepped cutting edges 215 are recessed along the central axis direction of the drill body 100 and towards the drill shank 300 to form stepped chip spaces 230, and the stepped chip spaces 230 can be machined to the second flank 213.

[0082] In some embodiments of the present invention, as Figure 9 shown, the stepped cutting edges 215 extend along the first flank 212 to the outer edge of the drill tip 200, and the stepped cutting edges 215 can also extend to the intersection line of the first flank 212 and the second flank 213; and the stepped cutting edges 215 have multiple segments of stepped parallel cutting edges 2151; one segment of the stepped parallel cutting edge 2151 and one segment of the cutting edge 214 form a parallel step. That is, the stepped cutting edges 215 formed on the first flank 212 are parallel to the multiple segments of cutting edges 214 of the main cutting edge 210, making the cutting effect better and the torque received by the drill bit more uniform. As Figure 9 shown, the main cutting edge 210 has three segments of cutting edges 214 with different angles, then the stepped cutting edges 215 also have three segments of stepped parallel cutting edges 2151 with different angles. The stepped parallel cutting edge 2151 closest to the transverse cutting edge 220 is parallel to the cutting edge 214 of the main cutting edge 210 closest to the transverse cutting edge 220, and the stepped parallel cutting edge 2151 closest to the outer edge of the drill tip 200 is parallel to the cutting edge 214 of the main cutting edge 210 closest to the outer edge of the drill tip 200.

[0083] In some embodiments of the present invention, referring to Figures 10 to 12 , the drill body 100 is provided with a spiral land 110, and a land cutting edge 130 is provided on the outer side of the spiral land 110. A spiral groove 160 is formed on the outer side of the spiral land 110. The round edge 120 of the spiral land 110 has a secondary cutting edge, and a land cutting edge 130 is provided behind the secondary cutting edge of the spiral land 110, increasing the number of cutting edges and ensuring the strength requirements of the land at the same time, so that the land is not easily chipped.

[0084] In some embodiments of the present invention, referring to Figures 10 to 12 , a cutting edge groove 140 is provided on the outer side of the round edge 120 of the spiral land 110, and the cutting edge groove 140 and the outer side surface of the spiral land 110 form a land cutting edge 130. The cutting edge groove 140 is a spiral groove, which can reduce the land width, so as to reduce the contact area between the drill body 100 and the side wall of the drilled hole, reduce the probability of the drill body breaking due to chip jamming between the land and the side wall of the drilled hole, reduce the drilling resistance, reduce the torque received by the drill bit, and can improve the service life of the drill bit.

[0085] In some embodiments of the present invention, as Figure 12As shown, the width of the circular edge 120 of the spiral land 110 is 0.005 ≤ L7 ≤ 0.2; the width of the cutting edge groove 140 is 0.002 ≤ L6 ≤ 0.08, and the depth of the cutting edge groove 140 is 0.002 ≤ L5 ≤ 0.08;

[0086] wherein, L6 = 40% × L7.

[0087] In some embodiments of the present invention, a land step 150 is provided on the outer side of the spiral land 110. The land step 150 can reduce the land width of the spiral land 110, reduce the contact area between the hole wall and the spiral land 110, and reduce the probability of the drill body breaking due to chip jamming between the land and the drilling side wall.

[0088] In some embodiments of the present invention, there may be multiple land steps. In this embodiment, as Figure 10 shown, the land length of the spiral land is 0.05 ≤ L8 ≤ 20, the position of the land step is not limited, the number of steps n2 ≥ 2, and the land length of each section of the step is Lr = L8 / n2.

[0089] In some embodiments of the present invention, it further includes: a drill shank 300; the drill shank 300 is connected to the drill body 100 in a direction away from the drill tip 200; the drill tip 200 is sequentially divided into multiple drill tip segments 240 along the direction from the vertex of the drill tip 200 to the drill shank 300, and the drill tip angles of the multiple drill tip segments 240 arranged in sequence along the direction from the drill tip vertex to the drill shank 300 gradually decrease. As Figure 13 shown, the smaller the drill tip angle, the less the wear of the drill tip. By respectively machining drill tip segments 240 with different drill tip angles at the drill tip 200, the wear of the drill bit can be reduced and the service life of the drill bit can be improved. Further, as Figure 13 shown, the drill tip segment is 3 segments, and the corresponding drill tip angles are 130°, 90°, and 60°.

[0090] The embodiments of the present invention also provide a processing device, which includes a power device, a clamping device, and a drill bit as described above. The clamping device clamps the drill bit, and the power device drives the drill bit to rotate through the clamping device. That is, the power device can use the drill bit for drilling. The power device can be a motor, a motor, etc. The clamping device can be a jaw, a three-jaw chuck, etc.

[0091] In summary, the drill bit and the processing device of this embodiment have at least the following beneficial effects:

[0092] (1) The cutting angles of multiple said cutting edges 214 increase successively outward from one end of the chisel edge 220. That is, the cutting force of the cutting edge 214 farther out is greater, and the torsion received will also increase. Therefore, the torsion received by the cutting edge 214 near the center during cutting is less than that received by the cutting edge 214 near the outside of the main cutting edge 210. By adjusting the cutting angles of multiple segments of the cutting edge 214, the torsion received by the entire drill bit can be made more uniform, the wear of the main cutting edge 210 can be made more uniform, and the service life of the drill bit can be improved.

[0093] (2) A stepped edge 215 extending to the chisel edge 220 is provided on the flank 219. On a drill tip 200 of the same size, since the stepped edge 215 extending to the chisel edge 220 is provided, the effective cutting length of the chisel edge 220 will be shortened to reduce the drilling resistance; the stepped edge 215 is provided on the flank 219, so that a cutting edge is added on the flank 219 to enhance the cutting ability, enabling the stepped edge 215 to assist the cutting edge 214 of the main cutting edge 210 in cutting, reducing the friction between a single main cutting edge 210 and the material, reducing the wear of the cutting edge 214 of the main cutting edge 210, improving the tool life, and at the same time enabling the drill tip 200 to have a self-centering function, facilitating the alignment of the drill bit with the workpiece center.

[0094] (3) During the drilling process, since the temperature of the drill tip 200 is the highest, the chips being squeezed on the flank 219 can easily cause the temperature of the drill tip 200 to decrease slowly. The chips on the flank 219 can be discharged through the first chip groove 216 on the flank 219 to improve the heat dissipation efficiency of the drill tip 200 and increase the chip capacity of the drill tip 200.

[0095] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A drill bit, characterized in that, Comprising: Drill body, drill tip; The drill tip is arranged at one end of the drill body; the drill body has a spiral groove penetrating the drill tip; The drill tip includes a chisel edge and two main cutting edges that are centrosymmetric; The main cutting edge includes a rake face and a flank face; there are multiple cutting edges provided between the rake face and the flank face; the cutting edge is a chamfered surface formed by chamfering the intersection line of the rake face and the flank face, and each cutting edge and the flank face have a cutting angle; in the direction from the drill core of the drill tip to the outer side surface of the drill body, the cutting angles of the multiple cutting edges increase in sequence; The flank faces of one of the main cutting edges intersect with the flank faces of the other main cutting edge to form the chisel edge; and step edges are provided along the extending directions at both ends of the chisel edge on the flank face; Multiple first chip removal grooves communicating with the spiral groove are provided on the flank face.

2. The drill bit according to claim 1, wherein, The flank face includes a first flank face and a second flank face, the second flank face intersects with the first flank face, and multiple cutting edges are provided between the first flank face and the rake face; the second flank face is located on the side of the first flank face away from the cutting edge; the first chip removal groove is provided on the second flank face, and the first chip removal groove communicates to the intersection of the first flank face and the second flank face, and the first flank face of one of the main cutting edges intersects with the second flank face of the other main cutting edge to form a half chisel edge, and the two half chisel edges intersect at the center of the drill tip to form the continuous chisel edge.

3. The drill bit according to claim 2, characterized in that, Multiple second chip removal grooves are further provided on the second flank face, the second chip removal grooves are provided on the outer peripheral edge of the second flank face away from the chisel edge, and the first chip removal groove is provided between the second chip removal groove and the chisel edge.

4. The drill bit according to claim 1, characterized in that, The sum of the rake angle and the clearance angle of the main cutting edge is The angle between the chamfered surface and the flank face is The chamfer angle of the chamfered surface is Among them, 5. The drill bit according to claim 1, characterized in that, The included angle between each chamfered surface of the main cutting edge and the flank face is equal, and the size range of the included angle between the chamfered surface and the flank face is 90° - 150°; The length L of each cutting edge is: L = (38% × D) / n; The diameter D of the drill tip is: D = 2 × L11 × sin(θ / 2); Wherein, n is the number of segments of the cutting edge of one of the main cutting edges, L11 is the straight-line length between the vertex of the drill tip and the intersection point of the main cutting edge and the outer edge; θ is the drill tip angle.

6. The drill bit according to claim 1, characterized in that, The shape of the first chip removal groove can be linear, wavy or arc-shaped.

7. The drill bit according to claim 2, characterized in that, Step tooth gaps are provided along the extending directions at both ends of the chisel edge on the drill tip; the step tooth gaps are recessed towards the length direction of the drill body; the step tooth gaps intersect with the first flank face to form the step edges.

8. The drill bit according to claim 7, characterized in that, The maximum width of the first flank face is one-half of the core thickness of the drill body; The number of steps of the step tooth gap is n1 = (55% × D1) / (2 × L9); Where D1 is the core thickness of the drill body, and L9 is the width of the step edge, 0.001 ≤ L9 ≤ 0.

4.

9. The drill bit according to claim 2, wherein The step edge extends along the first flank face to the outer edge of the drill tip; and the step edge has multiple step parallel edges; one step parallel edge and one cutting edge form a parallel step.

10. The drill bit according to claim 1, characterized in that, The drill body is provided with a spiral cutting edge band, the spiral cutting edge band has a round cutting edge, and a cutting edge of the cutting edge band is arranged on the outer side of the round cutting edge.

11. The drill bit according to claim 10, characterized in that, A cutting edge groove is arranged on the outer side of the round cutting edge, and the cutting edge groove and the outer side surface of the spiral cutting edge band form the cutting edge of the cutting edge band.

12. The drill bit according to claim 11, characterized in that, The width of the round cutting edge of the spiral cutting edge band is 0.005≤L7≤0.2; the width of the cutting edge groove is 0.002≤L6≤0.08, and the depth of the cutting edge groove is 0.002≤L5≤0.08; wherein, L6 = 40%×L7.

13. The drill bit according to claim 10, characterized in that, A cutting edge step is arranged on the outer side of the spiral cutting edge band.

14. The drill bit according to claim 1, characterized in that, Further comprising: a drill shank; The drill shank is connected to the drill body in a direction away from the drill tip; the drill tip is sequentially divided into multiple drill tip segments along the direction from the drill tip vertex to the drill shank, and the drill tip angles of the multiple drill tip segments arranged in sequence along the direction from the drill tip vertex to the drill shank gradually decrease.

15. A processing device, characterized in that, Comprising: a power device, a clamping device, and a drill bit according to any one of claims 1-14, the clamping device clamps the drill bit, and the power device drives the drill bit to rotate through the clamping device.

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