Drill insert and machining device

Abstract

Disclosed are a drill insert and a machining device. The drill insert comprises a drill body, a drill point, and a drill shank; the drill point comprises two main cutting lips and a chisel edge; the main cutting lips comprise a rake face and a flank face; a multi-segment cutting edge is provided between the rake face and the flank face; the cutting edge is a chamfered surface formed by chamfering an intersection line of the rake face and the flank face, and each segment of the cutting edge is formed with a cutting angle with respect to the flank face; the cutting angles of the multi-segment cutting edge increase sequentially in a direction from a web of the drill point to an outer side surface of the drill body; and the flank face is provided with a stepped edge and a plurality of first flutes, and the first flutes are in communication with a helix groove of the drill body. The cutting angles of the multi-segment cutting edge sequentially increase outward.

Description

Drill bit and processing equipment TECHNICAL FIELD

[0001] The present application relates to the technical field of precision machining, in particular to a drill bit and processing equipment. BACKGROUND

[0002] With the rapid development of the semiconductor industry, PCD micro drill bits are often used to process precise small holes in the semiconductor industry, and there are high requirements for the processing quality of small holes. Traditional hard alloy micro drill bits cannot meet the use requirements, and the existing drill bits gradually reduce the torsion force received by the cutting edge from the middle to the outside during cutting. The same angle of the main cutting edge causes the torsion force of the cutting edge outside the main cutting edge to be different from that of the cutting edge close to the center, and the cutting edge close to the center of the main cutting edge wears more severely, affecting the service life of the drill bit. SUMMARY

[0003] The present application provides a drill bit to solve the technical problem that the cutting edge close to the center of the main cutting edge wears more severely, affecting the service life of the drill bit.

[0004] To achieve the above-mentioned purpose, the first aspect of the present application provides a drill bit, comprising: a drill body, a drill tip, 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 comprises a cross blade and two center-symmetric main cutting edges;

[0007] The main cutting edge comprises a rake face and a relief face; a plurality of cutting edges are arranged between the rake face and the relief face; the cutting edge is an inverted corner face formed by chamfering the intersection line of the rake face and the relief face, each cutting edge and the relief face have a cutting angle; the cutting angles of the plurality of cutting edges gradually increase in the direction from the drill core of the drill tip to the outer side surface of the drill body;

[0008] The relief face of one of the main cutting edges intersects with the relief face of the other main cutting edge to form the cross blade; and the relief face is provided with a stepped blade in the extension direction of the two ends of the cross blade;

[0009] In some embodiments, the relief face is provided with a plurality of first chip removal grooves communicating with the spiral groove.

[0010] In some embodiments, the clearance face comprises a first clearance face and a second clearance face, the second clearance face intersects with the first clearance face, the first clearance face intersects with the rake face, and the cutting edge is located at the intersection of the first clearance face and the rake face; the second clearance face is located on the side of the first clearance face away from the cutting edge; the first flute is arranged on the second clearance face, and the first flute is connected to the intersection of the first clearance face and the second clearance face, wherein the first clearance face of one of the main cutting edges intersects with the second clearance face of the other main cutting edge to form a half-width land, and the two half-width lands intersect at the center of the drill tip to form a continuous width land.

[0011] In some embodiments, the second clearance face is further provided with a plurality of second flutes, the second flutes are arranged on the second clearance face away from the peripheral edge of the width land, and the first flute is arranged between the second flutes and the width land.

[0012] In some embodiments, the sum of the rake angle and the clearance angle of the main cutting edge is The included angle between the chamfer surface and the clearance face is The chamfer angle of the chamfer surface is

[0013] wherein,

[0014] In some embodiments, the included angle between each chamfer surface of the main cutting edge and the clearance face is equal, and the included angle between the chamfer surface and the clearance face ranges from 90° to 150°.

[0015] The length L of each cutting edge is: L = (38% × D) / n.

[0016] The diameter D of the drill tip is: D = 2 × L11 × sin(θ / 2).

[0017] wherein, n is the number of segments of the cutting edge of one main cutting edge, L11 is the straight line length between the drill tip vertex and the intersection point of the main cutting edge and the outer edge of the drill tip; θ is the drill tip angle.

[0018] In some embodiments, the shape of the first flute can be linear, wavy, or circular arc.

[0019] In some embodiments, the drill tip is provided with a stepped gap in the extension direction of the two ends of the width land; the stepped gap is recessed towards the length direction of the drill body; the stepped gap intersects with the first clearance face to form the stepped land.

[0020] In some embodiments, the maximum width of the first clearance face is half of the core thickness of the drill body.

[0021] The number of steps of the stepped clearance is n1=(55%×D1) / (2×L9);

[0022] Wherein D1 is the core thickness of the drill body, L9 is the width of the stepped land, 0.001≤L9≤0.4.

[0023] In some embodiments, the stepped land extends along the first flank to the outer edge of the drill tip; and the stepped land has multiple stepped parallel lands; one of the stepped parallel lands forms a parallel step with one of the land edges.

[0024] In some embodiments, the drill body is provided with a spiral land band having a round land, and the round land is provided with a land band cutting land outside.

[0025] In some embodiments, the round land is provided with a cutting land groove outside, and the cutting land groove and the outside surface of the spiral land band form the land band cutting land.

[0026] In some embodiments, the width of the round land of the spiral land band is 0.005≤L7≤0.2; the width of the cutting land groove is 0.002≤L6≤0.08, and the depth of the cutting land groove is 0.002≤L5≤0.08.

[0027] Wherein, L6=40%×L7.

[0028] In some embodiments, the outside of the spiral land band is provided with a land band step.

[0029] In some embodiments, 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 from the drill tip vertex to the drill shank, and the drill tip vertex angles of the multiple drill tip segments arranged in sequence from the drill tip vertex to the drill shank gradually decrease.

[0030] The second aspect of the present application also provides a processing equipment, which comprises: 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.

[0031] The drill bit and the processing equipment with the drill bit have the beneficial effects that: the cutting angles of the multiple cutting edges are sequentially increased outward along one end of the chisel edge, the cutting force of the cutting edge farther outward is greater, the torsion received by the cutting edge farther outward is also increased, the torsion received by the cutting edge close to the center is smaller than the torsion received by the cutting edge close to the outer side of the main cutting edge, the cutting angles of the multiple cutting edges are adjusted to make the torsion received by the entire drill bit more uniform, the wear of the main cutting edge is more uniform, and the service life of the drill bit is improved; the effective cutting length of the chisel edge is shortened due to the stepped cutting edge extending to the chisel edge, so as to reduce the drilling resistance; the stepped cutting edge is arranged on the relief surface, the cutting edge is increased on the relief surface, the cutting capacity is enhanced, the stepped cutting edge can assist the cutting edge of the main cutting edge to cut, the friction between the single main cutting edge and the material is reduced, the wear of the cutting edge of the main cutting edge is reduced, and the tool life is improved; in addition, in the drilling process, the temperature of the drill tip is the highest, and the temperature of the drill tip is slowly reduced due to the fact that the debris is pressed on the relief surface, the debris on the relief surface can be discharged through the first chip groove, the heat dissipation efficiency of the drill tip is improved, and the chip capacity of the drill tip is increased.

[0032] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0033] Fig. 1 is a structural schematic diagram of a drill bit of an embodiment of the present application;

[0034] Fig. 2 is a structural schematic diagram of a drill tip with a stepped tooth gap of an embodiment of the present application;

[0035] Fig. 3 is a schematic diagram of the rake angle and the relief angle of the main cutting edge of an embodiment of the present application;

[0036] Fig. 4 is a schematic diagram of the included angle between the chamfer surface and the first relief surface of the A section, the B section and the C section in Fig. 2;

[0037] Fig. 5 is a schematic diagram of the length of the cutting edge in Fig. 2;

[0038] Fig. 6 is a schematic diagram of the diameter D of the drill tip and the drill tip angle θ;

[0039] Fig. 7 is a schematic diagram of the core thickness D1 of the drill body, the width L9 of the stepped cutting edge and the width of the stepped tooth gap;

[0040] Fig. 8 is a schematic diagram of the fall H1 of a single step of the stepped tooth gap and the recess depth H2 of the tooth gap;

[0041] Fig. 9 is a schematic diagram of the drill tip structure of an embodiment of the present application in which the stepped cutting edge extends to the outer edge of the drill tip;

[0042] Fig. 10 is a schematic diagram of the drill body structure of an embodiment of the present application;

[0043] Fig. 11 is a structural diagram of a helical land and land step according to an embodiment of the present application;

[0044] Fig. 12 is a structural diagram of a drill body according to an embodiment of the present application;

[0045] Fig. 13 is a structural diagram of a drill tip having a plurality of drill tip segments.

[0046] In the drawings, 100, drill body; 110, helical land; 120, round land; 130, land cutting edge; 140, cutting edge groove; 150, land step; 160, helical groove; 200, drill tip; 210, main cutting edge; 211, rake face; 212, first flank face; 213, second flank face; 214, land edge; 215, step land; 2151, step parallel land; 216, first flute; 217, second flute; 218, chamfer; 219, flank face; 220, cross land; 230, step clearance; 240, drill tip segment; 300, shank. DETAILED DESCRIPTION

[0047] Embodiments of the present application are described in detail below with reference to the attached drawings, wherein like or similar elements are denoted by the same or similar reference symbols throughout the drawings. The embodiments described below are examples of the present application, and are not intended to limit the present application.

[0048] In the description of the present application, if the orientation description, such as up, down, front, back, left, right, etc. is involved, the orientation or position relationship shown in the drawings is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0049] In the description of the present application, the meaning of several is one or more, and the meaning of multiple is two or more. Greater than, less than, more than, etc. are understood as not including the number itself, and above, below, etc. are understood as including the number itself. If it is described as first, second, etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of indicated technical features.

[0050] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0051] Please refer to Figs. 1-13, the drill bit provided by some embodiments of the present application is described.

[0052] As shown in Figs. 1-2, the drill bit of the embodiments of the present application comprises a drill body 100 and a drill tip 200.

[0053] The drill tip 200 is arranged at one end of the drill body 100; the drill body 100 has a helical groove 160 extending through the drill tip 200.

[0054] The drill tip 200 comprises two main cutting edges 210 and a cross edge 220; the two main cutting edges 210 are symmetric about the center of the drill tip 200, and the cross edge 220 is located between the two main cutting edges 210.

[0055] The main cutting edge 210 comprises a rake face 211 and a relief face 219; a plurality of edge portions 214 are arranged between the rake face 211 and the relief face 219; the edge portion 214 is an edge chamfer 218 formed by chamfering the intersection line of the rake face 211 and the relief face 219, and the relief face 219 has a cutting angle with a single edge portion 214; the cutting angles of the plurality of edge portions 214 increase in turn in the direction from the drill core of the drill tip 200 to the outer side surface of the drill body 100; the position of the drill core of the drill tip 200 can be referred to the dotted circle at D1 in Fig. 7.

[0056] The relief face 219 of one of the main cutting edges 210 intersects with the relief face 219 of the other main cutting edge 210, and the intersection position forms the cross edge 220; and the relief face 219 is provided with a stepped edge 215 in the extension direction of the two ends of the cross edge 220. The relief face 219 is provided with a plurality of first chip flutes 216, and the first chip flutes 216 are connected to the helical groove 160.

[0057] In some embodiments, as shown in Fig. 2, the main cutting edge 210 is two, and the two main cutting edges 210 and the cross edge 220 are symmetrically arranged about the central axis of the drill body 100; the relief face 219 of one of the main cutting edges 210 intersects with the relief face 219 of the other main cutting edge 210 to form the cross edge 220.

[0058] A plurality of blade edges 214 are arranged between the rake face 211 and the relief face 219, in some embodiments, as shown in FIG. 2, the plurality of blade edges 214 are divided into A section, B section and C section; and the cutting angles of the plurality of blade edges 214 gradually increase in the direction from the drill core of the drill tip 200 to the outer side of the drill body 100, that is, the cutting angle of the A section is the largest, the cutting force of the blade edge 214 farther out is greater, and the torsion received is also increased, therefore, the torsion received by the blade edge 214 close to the center is smaller than the torsion received by the blade edge 214 close to the outer side of the main cutting edge 210, then the torsion received by the entire drill bit is more uniform by adjusting the cutting angles of the plurality of blade edges 214, the wear of the main cutting edge 210 is more uniform, and the service life of the drill bit is improved.

[0059] In addition, the relief face 219 is provided with a stepped blade 215 extending to the cross blade 220, and the effective cutting length of the cross blade 220 is shortened to reduce the drilling resistance on the same size drill tip 200 due to the stepped blade 215 extending to the cross blade 220; the stepped blade 215 is arranged on the relief face 219, and the cutting edge is increased on the relief face 219 to enhance the cutting ability, so that the stepped blade 215 can assist the blade edge 214 of the main cutting edge 210 to cut, reduce the friction between the single main cutting edge 210 and the material, reduce the wear of the blade edge 214 of the main cutting edge 210, improve the tool life, and at the same time, the drill tip 200 has a self-centering function, which facilitates the alignment of the drill bit and the workpiece center.

[0060] Due to the increase of the stepped blade 215, in order to facilitate chip removal, the relief face 219 is provided with a first chip removal groove 216 communicating with the spiral groove 160; during the drilling process, the temperature of the drill tip 200 is the highest, and if the debris is pressed on the relief face 219, the temperature of the drill tip 200 is likely to decrease slowly, therefore, the debris on the relief face 219 can be discharged through the first chip removal groove 216 of the relief face 219, so as to improve the heat dissipation efficiency of the drill tip 200 and increase the chip capacity of the drill tip 200.

[0061] In some embodiments of the present application, the clearance surface 219 comprises a first clearance surface 212 and a second clearance surface 213, the second clearance surface 213 intersects the first clearance surface 212, the first clearance surface 212 intersects the rake surface 211, and the edge 214 is a chamfer of the intersection of the first clearance surface 212 and the rake surface 211; the second clearance surface 213 is located on the side of the first clearance surface 212 away from the edge 214; the first flute 216 is arranged on the second clearance surface 213, and the first flute 216 communicates to the intersection of the first clearance surface 212 and the second clearance surface 213, the first clearance surface 212 of one of the main cutting edges 210 intersects the second clearance surface 213 of the other main cutting edge 210 to form a half segment of the chisel edge, and the two half segments of the chisel edge intersect at the center of the drill tip to form a continuous chisel edge 220. By dividing the clearance surface 219 into the first clearance surface 212 and the second clearance surface 213, the second clearance surface 213 reduces contact with the workpiece, reduces friction, reduces wear, and facilitates the drainage of the first clearance surface 212 through the first flute 216 to the spiral flute 160, facilitating the drainage of the drill tip 200.

[0062] In some embodiments of the present application, referring to FIG. 2, the second clearance surface 213 is further provided with a plurality of second flutes 217, the second flutes 217 are arranged on the outer peripheral edge of the second clearance surface 213 away from the chisel edge 220, and the first flutes 216 are arranged between the second flutes 217 and the chisel edge 220. In the drilling process, the outer peripheral edge of the intersection of the second clearance surface 213 and the first clearance surface 212 of the drill tip 200 has the highest heat accumulation, by arranging the second flutes 217 on the outer edge of the second clearance surface 213, the contact of the second clearance surface 213 with the swarf can be reduced, which is conducive to chip removal, increases the contact area of the coolant with the drill tip 200, reduces the drilling heat, and further rapidly drains the heat accumulated at the corner, and also appropriately increases the chip carrying capacity of the drill tip 200.

[0063] In some embodiments of the present application, referring to FIGS. 2 to 4, each of the chamfers 218 of the main cutting edge 210 forms a plurality of edges 214; the sum of the rake angle and the relief angle of the main cutting edge is The included angle between the chamfer 218 and the clearance surface 219 is (in some embodiments, the clearance surface 219 comprises a first clearance surface 212 and a second clearance surface 213, and here the first clearance surface 212 is taken as the measurement reference of the clearance surface 219); the chamfer angle of the chamfer 218 is

[0064] wherein,

[0065] As shown in FIG. 3, a is the rake angle of the cutting edge, b is the relief angle of the cutting edge, and the section is the section of the cutting edge perpendicular to the face of the drill tip vertex angle.

[0066] The angle between the chamfer and the first clearance face is shown in FIG. 4, a1 is the angle between the chamfer of the A section cutting edge and the first clearance face, a2 is the angle between the chamfer of the B section cutting edge and the first clearance face, and a3 is the angle between the chamfer of the C section cutting edge and the first clearance face. The cutting edge can be divided into several sections, and an is the angle between the chamfer of the n section cutting edge and the first clearance face. The chamfer angle is the machining angle of the chamfer.

[0067] In some embodiments, the optimal value of the angle between the chamfer and the first clearance face is 120°, at which the drill bit is made of PCD material and is used for cutting hard and brittle materials, so that the cutting edge is uniformly stressed and worn, and the life of the tool is improved.

[0068] In some embodiments of the present application, the angle between each chamfer 218 of the main cutting edge 210 and the clearance face 219 (i.e., the above-mentioned ) is equal (in some embodiments, referring to FIGS. 4 and 5, a1=a2=a3=an); and the angle between the chamfer 218 and the clearance face 219 ranges from 90° to 150°.

[0069] The length L of each section of the cutting edge is: L=(38%xD) / n;

[0070] The diameter D of the drill tip is: D=2xL11xsin(0 / 2);

[0071] Where, as shown in FIGS. 5 and 6, n is the number of sections of the cutting edge of the main cutting edge 210, L11 is the straight line length between the drill tip vertex and the intersection point of the main cutting edge 210 and the outer edge; and 0 is the drill tip angle.

[0072] Through the above formula, the length of each cutting edge is calculated to better process the drill bit.

[0073] In some embodiments of the present application, the shape of the first flute 216 can be linear, wavy or circular. When the first flute 216 is circular, the center of the circular arc is located on the central axis of the drill body 100. The shape of the first flute 216 can be modified according to specific needs to adapt to different chip removal conditions.

[0074] In some embodiments of the present application, as shown in FIG. 2, the drill tip 200 is provided with a stepped tooth gap 230 along the extension direction of the two ends of the chisel edge 220; that is, the stepped tooth gap 230 is arranged at the two ends of the chisel edge 220, and the stepped tooth gap 230 is recessed towards the length direction of the drill body 100; the stepped tooth gap 230 intersects with the first relief surface 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 relief surface 213 of the other main cutting edge 210 to also form the stepped edge 215. Then the stepped tooth gap 230 is directly machined at the two ends of the chisel edge 220 to directly shorten the length of the chisel edge 220 to 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. In order to reduce the chisel edge 220 while reducing the impact of the reduction of the core thickness on the fracture strength of the drill body 100, the structure of the chisel edge 220 is reduced by the stepped tooth gap 230, which reduces the size of the chisel edge 220 while reducing the impact on the fracture strength of the drill bit, and at the same time can achieve the effect of chip breaking.

[0075] In some embodiments of the present application, as shown in FIG. 7 and FIG. 8, the maximum width of the first relief surface 212 is half of the core thickness of the drill body 100.

[0076] The number of steps of the stepped tooth gap 230 is n1=(55%xD1) / (2xL9);

[0077] Where D1 is the core thickness of the drill body, and L9 is the width of the stepped edge, 0.001≤L9≤0.4.

[0078] As shown in FIG. 7 and FIG. 8, in some embodiments, 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 difference of a single step is 0.0005≤H1≤0.02; the recess depth of the tooth gap is 0.0024≤H2≤0.096; the length units of the above L9, L10, H1, H2 ranges are all millimeters.

[0079] In some embodiments, the relationship between the width of the tooth gap and the core thickness is L10=43%xD1;

[0080] In some embodiments, the relationship between the recess depth and the core thickness is H2=16%xD1.

[0081] The core thickness and the parameters of the stepped tooth gap calculated by the above formula can effectively prevent the drill bit from breaking during machining.

[0082] In some embodiments, as shown in FIG. 2, the stepped blade 215 is arranged symmetrically about the cross blade 220 as the center axis, and the stepped blade 215 is recessed along the direction of the center axis of the drill body 100 and towards the drill shank 300 to form a stepped tooth gap 230, which can be machined to the second relief surface 213.

[0083] In some embodiments of the present application, as shown in FIG. 9, the stepped blade 215 extends to the outer edge of the drill tip 200 along the first relief surface 212 (in some embodiments, the stepped blade 215 can also extend to the intersection line of the first relief surface 212 and the second relief surface 213); and the stepped blade 215 has multiple stepped parallel blades 2151; one of the stepped parallel blades 2151 forms a parallel step with one of the blade edges 214. That is, the stepped blade 215 shaped on the first relief surface 212 is parallel to the multiple blade edges 214 of the main cutting blade 210, so that the cutting effect is better and the torque on the drill bit is more uniform. Each stepped parallel blade 2151 forms a parallel step with its corresponding blade edge 214. As shown in FIG. 9, the main cutting blade 210 has three blade edges 214 with different angles, and the stepped blade 215 also has three stepped parallel blades 2151 with different angles. The stepped parallel blade 2151 closest to the cross blade 220 is parallel to the blade edge 214 of the main cutting blade 210 closest to the cross blade 220, and the stepped parallel blade 2151 closest to the outer edge of the drill tip 200 is parallel to the blade edge 214 of the main cutting blade 210 closest to the outer edge of the drill tip 200.

[0084] In some embodiments of the present application, referring to FIGS. 10-12, the drill body 100 is provided with a spiral blade band 110, and the outer side of the spiral blade band 110 is provided with a blade band cutting blade 130. In some embodiments, the spiral blade band 110 is provided with a spiral groove 160 on the outer side, and the round blade 120 of the spiral blade band 110 has a secondary cutting blade, and the spiral blade band 110 is provided with a blade band cutting blade 130 behind the secondary cutting blade, thereby increasing the number of cutting blades while ensuring the strength requirement of the blade band, so that the blade band is not easy to collapse.

[0085] In some embodiments of the present application, referring to FIGS. 10-12, the outer side of the round blade 120 of the spiral blade band 110 is provided with a cutting blade groove 140, and the cutting blade groove 140 and the outer side of the spiral blade band 110 form a blade band cutting blade 130. In some embodiments, the cutting blade groove 140 is a spiral groove, which can reduce the width of the blade band, thereby reducing the contact area between the drill body 100 and the sidewall of the drill hole, reducing the probability of the drill body breaking due to the sharp cutting of the blade band and the sidewall of the drill hole, reducing the drilling resistance, reducing the torque on the drill bit, and improving the service life of the drill bit.

[0086] In some embodiments of the present application, as shown in FIG. 12, the width of the circular blade 120 of the spiral blade band 110 is 0.005≤L7≤0.2; the width of the cutting blade groove 140 is 0.002≤L6≤0.08, and the depth of the cutting blade groove 140 is 0.002≤L5≤0.08.

[0087] L6=40%×L7.

[0088] In some embodiments of the present application, the outer side of the spiral blade band 110 is provided with a blade band step 150. The blade band step 150 can reduce the width of the blade band of the spiral blade band 110, reduce the contact area between the hole wall and the spiral blade band 110, and reduce the probability of the drill body breaking due to the blade band and the drill hole side wall sticking to the chip.

[0089] In some embodiments of the present application, the blade band step can be multiple, and in some embodiments, as shown in FIG. 10, the blade length of the spiral blade band is 0.05≤L8≤20, the position of the blade band step is not limited, the number of steps n2≥2, and the length of each step is Lr=L8 / n2.

[0090] In some embodiments of the present application, the drill handle 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 drill tip vertex to the drill handle 300, and the drill tip vertex angles of the multiple drill tip segments 240 arranged in sequence along the direction from the drill tip vertex to the drill handle 300 gradually decrease, as shown in FIG. 13, the smaller the drill tip vertex angle, the smaller the wear of the drill tip, and by machining drill tip segments 240 with different drill tip vertex 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. In some embodiments, as shown in FIG. 13, the drill tip segment is 3 segments, and the corresponding drill tip vertex angles are 130°, 90°, and 60°.

[0091] The embodiment of the present application also provides a machining device, which comprises 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 to drill. In some embodiments, the power device can be a motor, a motor, etc. In some embodiments, the clamping device can be a jaw, a three-jaw chuck, etc.

[0092] In summary, the drill bit and the machining device of the present embodiment have at least the following beneficial effects:

[0093] (1) The cutting angles of the plurality of said cutting edges 214 are sequentially increased outward along one end of the chisel edge 220, that is, the cutting force of the cutting edge 214 farther outward is greater, and the torsion received is also increased, therefore, the torsion received by the cutting edge 214 close to the center is smaller than that of the cutting edge 214 close to the outside of the main cutting edge 210, then by adjusting the cutting angles of the plurality of cutting edges 214, the torsion received by the entire drill bit is more uniform, the wear of the main cutting edge 210 is more uniform, and the service life of the drill bit is improved.

[0094] (2) The relief surface 219 is provided with a stepped edge 215 extending to the chisel edge 220, on the same size drill tip 200, because 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 arranged on the relief surface 219, then the cutting edge is increased on the relief surface 219 to enhance the cutting ability, so that the stepped edge 215 can assist the cutting edge 214 of the main cutting edge 210 to cut, reduce the friction between the single main cutting edge 210 and the material, reduce the wear of the cutting edge 214 of the main cutting edge 210, improve the tool life, and at the same time, the drill tip 200 has a self-centering function, which facilitates the alignment of the drill bit and the workpiece center.

[0095] (3) During drilling, because the temperature of the drill tip 200 is the highest, the debris extruded on the relief surface 219 is easy to cause the temperature of the drill tip 200 to decrease slowly, the debris of the relief surface 219 can be discharged through the first chip removal groove 216 of the relief surface 219 to improve the heat dissipation efficiency of the drill tip 200 and increase the chip removal capacity of the drill tip 200.

[0096] The above is only the preferred embodiment of the present application, it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and substitutions can also be made, which should be considered as the protection scope of the present application.

Claims

1. A drill bit, characterized by, The drill bit comprises: a drill body and a drill tip; the drill tip is arranged at one end of the drill body; the drill body has a helical groove through the drill tip; the drill tip comprises a cross blade and two main cutting edges which are centrally symmetrical; the main cutting edges comprise a rake face and a relief face; a plurality of cutting edges are arranged between the rake face and the relief face; the cutting edges are chamfered surfaces formed by chamfering the intersection line of the rake face and the relief face; each cutting edge and the relief face have a cutting angle; the cutting angles of the plurality of cutting edges gradually increase in the direction from the drill core of the drill tip to the outer side surface of the drill body; the relief face of one of the main cutting edges intersects with the relief face of the other main cutting edge to form the cross blade; and the relief face is provided with a stepped blade along the extension direction of the two ends of the cross blade. the relief face is provided with a plurality of first chip removal grooves which communicate with the helical groove.

2. The drill bit of claim 1, wherein, the relief face comprises a first relief face and a second relief face; the second relief face intersects with the first relief face; the first relief face and the rake face are provided with a plurality of cutting edges; the second relief face is located on the side of the first relief face away from the cutting edges; the first chip removal groove is arranged on the second relief face and communicates with the intersection of the first relief face and the second relief face; the first relief face of one of the main cutting edges intersects with the second relief face of the other main cutting edge to form a half cross blade; and the two half cross blades intersect at the center of the drill tip to form a continuous cross blade.

3. The drill bit of claim 2, wherein, the second relief face is further provided with a plurality of second chip removal grooves; the second chip removal grooves are arranged on the outer peripheral edge of the second relief face away from the cross blade; and the first chip removal groove is arranged between the second chip removal groove and the cross blade.

4. The drill bit of claim 1, wherein, the sum of the rake angle and the relief angle of the main cutting edge is the included angle between the chamfer and the relief surface is the chamfer angle of the chamfer is wherein 5. The drill bit of claim 1, wherein, the included angle between each chamfered surface of the main cutting edge and the relief face is equal; and the included angle between the chamfered surface and the relief face ranges from 90° to 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 cutting edges of one main cutting edge, 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 of the drill tip; and θ is the drill tip angle.

6. The drill bit of claim 1, wherein, the shape of the first chip removal groove can be linear, wavy or circular arc.

7. The drill bit of claim 2, wherein, the drill tip is provided with a stepped tooth gap along the extension direction of the two ends of the cross blade; the stepped tooth gap is recessed in the length direction of the drill body; the stepped tooth gap intersects with the first relief face to form the stepped blade.

8. The drill bit of claim 7, wherein, the maximum width of the first relief face is half of the core thickness of the drill body; the number of steps of the stepped tooth gap is n1=(55%×D1) / (2×L9); wherein D1 is the core thickness of the drill body, L9 is the width of the stepped blade, and 0.001≤L9≤0.

4.

9. The drill bit of claim 2, wherein, the stepped blade extends along the first relief face to the outer edge of the drill tip; and the stepped blade has a plurality of stepped parallel blades; one of the stepped parallel blades and one of the cutting edges form a parallel step.

10. The drill bit of claim 1, wherein, The drill body is provided with a spiral blade band having a round blade, and the outer side of the round blade is provided with a blade band cutting edge.

11. The drill bit of claim 10, wherein, The outer side of the round blade is provided with a cutting edge groove, and the cutting edge groove and the outer side of the spiral blade band form the blade band cutting edge.

12. The drill bit of claim 11, wherein, The width of the round blade of the spiral blade 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 of claim 10, wherein, The outer side of the spiral blade band is provided with a blade band step.

14. The drill bit of claim 1, wherein, Further comprising: a drill handle; The drill handle 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 a direction from the drill tip vertex to the drill handle, and the drill tip vertex angles of the multiple drill tip segments arranged in sequence along the direction from the drill tip vertex to the drill handle gradually decrease.

15. A processing apparatus, characterized by Comprising: a power device, a clamping device clamping the drill bit, and the drill bit according to any one of claims 1-14, the power device driving the drill bit to rotate through the clamping device.

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