Coating drilling tool and machining method

Abstract

The invention belongs to the technical field of drilling tools, and discloses a coating drilling tool and a machining method.The coating drilling tool comprises a drill tip part, the drill tip part comprises a front tool face and two tool end faces, the two tool end faces intersect to form a chisel edge, each tool end face comprises a first rear tool face, and the first rear tool faces intersect with the front tool face to form a main cutting edge; the drill tip part further comprises a first machining area, the first machining area is arranged on the front tool face and intersects with the main cutting edge, a first micro-texture is arranged in the first machining area, and / or the drill tip part further comprises a second machining area, the second machining area is arranged on the first rear tool face and intersects with the chisel edge and the main cutting edge, and a second micro-texture is arranged in the second machining area. A second microstructure is arranged in the second machining area. The first microtextures and the second microtextures can improve the surface roughness of the front tool face and the first rear tool face, improve the coating binding force, slow down tool abrasion, improve the cutting performance and reduce abrasive particle abrasion and bonding abrasion between interfaces.

Description

Technical Field

[0001] This invention relates to the field of drilling tools, and more particularly to a coated drilling tool and its processing method. Background Technology

[0002] As the requirements for precision, density, and reliability of PCBs continue to increase, the requirements for the wear resistance, lifespan, and precision of cutting tools during the drilling and machining of PCB materials are also increasing.

[0003] In related technologies, improvements to cutting tools mainly focus on optimizing the wear resistance, bending strength, and coating performance of carbide cutting tools. In actual drilling processes, the generated chips are prone to friction with the cutting tool, causing coating wear and affecting tool life. Furthermore, the contact area between the cutting tool and the board is large, and adhesion and wear are easily generated at the interface. Therefore, the cutting tool still has limitations such as insufficient coating adhesion, poor wear resistance, and limited lubrication performance, making it difficult to meet the high precision and high reliability requirements of current PCB board cutting and processing. Summary of the Invention

[0004] The purpose of this invention is to provide a coated drilling tool and processing method to solve the problems of insufficient coating adhesion of the tool and easy adhesion and wear of the tool during PCB board drilling.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] In a first aspect, a coated drill bit includes a drill tip, the drill tip including a rake face and a cutting edge face, the cutting edge face being provided in two places, the two cutting edge faces intersecting to form a chisel edge, the cutting edge face including a first flank face, the first flank face intersecting with the rake face to form a main cutting edge; the drill tip also includes a first machining area, the first machining area being disposed on the rake face, the first machining area intersecting with the main cutting edge, the first machining area being provided with a first microtexture, and / or, the drill tip also includes a second machining area, the second machining area being disposed on the first flank face, the second machining area intersecting with both the chisel edge and the main cutting edge, the second machining area being provided with a second microtexture.

[0007] Preferably, the drill tip includes a second machining area, which includes a first straight line and a second straight line. The first straight line is spaced apart from the chisel edge, and the second straight line is spaced apart from the main cutting edge.

[0008] Preferably, the first straight line and the second straight line are smoothly transitioned.

[0009] Preferably, the distance between the first straight line and the transverse cutting edge gradually increases along the direction close to the main cutting edge; and / or, the distance between the second straight line and the main cutting edge gradually increases along the direction away from the transverse cutting edge.

[0010] Preferably, the angle between the first straight line and the transverse cutting edge is α, and satisfies 3°≤α≤10°; and / or, the angle between the second straight line and the main cutting edge is β, and satisfies 15°≤β≤30°.

[0011] Preferably, the cutting edge face further includes a second flank face, the first flank face and the second flank face intersect to form a center line, the center line intersects with the chisel edge to form a drill tip, the first straight line intersects with the center line to form a first point, the second straight line intersects with the outer peripheral surface of the drill tip to form a second point, the core thickness of the drill tip is L, the distance between the first point and the drill tip is L1 along a direction perpendicular to the center line, the distance between the second point and the extension line of the main cutting edge is L2, and satisfies L / 10≤L1≤L / 4≤L2≤L / 2.

[0012] Preferably, the drill tip includes a first processing area, the diameter of the drill tip is φ, the vertical distance between the edge of the first processing area away from the main cutting edge and the main cutting edge is L3, and satisfies φ / 4≤L3<φ / 2.

[0013] Preferably, the drill tip includes a first processing area, wherein the first microtexture is at least one of a microgroove array and a micropit array; and / or, the drill tip includes a second processing area, wherein the second microtexture is at least one of a microgroove array and a micropit array.

[0014] Preferably, when the first microtexture is the microgroove array, the cross-sectional shape of the microgroove array is at least one of rectangle, triangle, and semicircle; when the first microtexture is the micropit array, the cross-sectional shape of the micropit array is at least one of rectangle and semicircle; and / or, when the second microtexture is the microgroove array, the cross-sectional shape of the microgroove array is at least one of rectangle, triangle, and semicircle; when the second microtexture is the micropit array, the cross-sectional shape of the micropit array is at least one of rectangle and semicircle.

[0015] Secondly, a processing method applied to the coated drilling tool as described above, the processing method comprising:

[0016] S1. Process the raw bar stock into semi-finished bar stock;

[0017] S2. A spiral groove is opened on the semi-finished bar stock and then ground to a point to form the drill tip;

[0018] S3. Form the first microtexture and / or the composite structure of the second microtexture and coating in the first processing area and / or the second processing area respectively.

[0019] The beneficial effects of this invention are:

[0020] A coated drill bit includes a drill tip, which includes a rake face and a cutting edge face. Two cutting edge faces are provided, intersecting to form a chisel edge. Each cutting edge face includes a first flank face, which intersects with the rake face to form a main cutting edge. The drill tip also includes a first machining area located on the rake face and intersecting with the main cutting edge. A first microtexture is provided within the first machining area. Alternatively, the drill tip may also include a second machining area located on the first flank face, intersecting with both the chisel edge and the main cutting edge. A second microtexture is provided within the second machining area.

[0021] Thus, by setting the first microtexture and the second microtexture on the rake face and the first flank face respectively, the surface roughness of the first and second machining areas can be improved, the contact area between the coating and the first and second machining areas can be increased, the coating adhesion and interfacial bonding strength can be improved, the surface quality and machining accuracy can be improved, the first microtexture and the second microtexture can capture and store wear particles during the cutting process, reduce coating wear, improve the coating performance in cutting, reduce the amount of wear debris in the interface, reduce abrasive wear and adhesive wear between interfaces, and improve the overall performance of the coated drill bit. Attached Figure Description

[0022] Figure 1 This is a first front view of the coated drilling tool in Embodiment 1 of the present invention;

[0023] Figure 2 This is a partial side view of the coated drilling tool in Embodiment 1 of the present invention;

[0024] Figure 3 This is a second front view of the coated drilling tool in Embodiment 1 of the present invention;

[0025] Figure 4 This is a schematic diagram of the first structure of the first processing area in Embodiment 1 of the present invention;

[0026] Figure 5 This is a schematic diagram of the first structure of the second processing area in Embodiment 1 of the present invention;

[0027] Figure 6 This is a schematic diagram of the second structure of the first processing area in Embodiment 1 of the present invention;

[0028] Figure 7 This is a schematic diagram of the second structure of the second processing area in Embodiment 1 of the present invention;

[0029] Figure 8 This is a flowchart of the processing method in Embodiment 1 of the present invention;

[0030] Figure 9 This is a front view of the coated drilling tool in Embodiment 2 of the present invention;

[0031] Figure 10 This is a front view of the coated drilling tool in Embodiment 3 of the present invention.

[0032] In the picture:

[0033] 1. Drill tip; 11. Rake face; 12. Tool end face; 121. First flank face; 122. Main cutting edge; 123. Second flank face; 124. Center line; 125. Drill tip; 13. Chisel edge; 14. First machining area; 141. First microtexture; 15. Second machining area; 151. Second microtexture; 152. First straight line; 153. Second straight line; 154. First point; 155. Second point; 2. Peripheral cutting edge. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0035] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0038] Example 1

[0039] See Figures 1 to 3 The present invention provides a coated drill bit, including a drill tip 1, the drill tip 1 including a rake face 11 and a cutting edge face 12, the cutting edge face 12 being provided in two, the two cutting edge faces 12 intersecting to form a chisel edge 13, the cutting edge face 12 including a first flank face 121, the first flank face 121 intersecting with the rake face 11 to form a main cutting edge 122; the drill tip 1 also includes a first machining area 14, the first machining area 14 being disposed on the rake face 11, the first machining area 14 intersecting with the main cutting edge 122, the first machining area 14 being provided with a first microtexture 141, and / or, the drill tip 1 also includes a second machining area 15, the second machining area 15 being disposed on the first flank face 121, the second machining area 15 intersecting with both the chisel edge 13 and the main cutting edge 122, the second machining area 15 being provided with a second microtexture 151.

[0040] In this embodiment, the drill tip 1 includes a first processing area 14 and a second processing area 15. The two cutting edge faces 12 are centrally symmetrically arranged. The first processing area 14 is located at the end of the front cutting edge face 11 facing the cutting edge face 12. The second processing area 15 is L-shaped. The first processing area 14 is arranged in a one-to-one correspondence with the front cutting edge face 11, and the second processing area 15 is arranged in a one-to-one correspondence with the first rear cutting edge face 121. The two second processing areas 15 are centrally symmetrically arranged on the drill tip 1. The coating drill also includes a peripheral cutting edge 2 and a shank (not shown in the figure). The drill tip 1, peripheral cutting edge 2 and shank are coaxially arranged. The cutting edge face 12 and the front cutting edge face 11 are both located on the drill tip 1. The drill tip 1, peripheral cutting edge 2 and shank are integrally formed.

[0041] Thus, by setting a first microtexture 141 and a second microtexture 151 on the rake face 11 and the first flank face 121 respectively, the surface roughness of the first machining area 14 and the second machining area 15 can be improved, the contact area between the coating and the first machining area 14 and the second machining area 15 can be increased, thereby improving the coating adhesion and interface bonding strength, reducing tool wear, improving surface quality and machining accuracy, and the first microtexture 141 and the second microtexture 151 can capture and store wear particles during the cutting process, reduce coating wear, and improve the performance of the coating in cutting. The first microtexture 141 set on the rake face 11 can reduce the contact length between the drill tip 1 and the chips, improve friction conditions, reduce the wear of the coated drill tool, and improve cutting performance. The second microtexture 151 set on the first flank face 121 can store and accommodate broken glass fibers and filler particles generated by the PCB board during drilling, reduce the amount of wear debris in the interface, reduce abrasive wear between interfaces, and improve the overall performance of the coated drill tool.

[0042] It is understandable that only a first processing area 14 or a second processing area 15 may be provided on the drill tip 1. The first microtexture 141 and the second microtexture 151 can both be formed in the first processing area 14 and the second processing area 15 by processing methods such as electrodeposition, electrical discharge, laser, and photolithography.

[0043] See Figure 3 In some embodiments, the second processing area 15 includes a first straight line 152 and a second straight line 153, the first straight line 152 being spaced apart from the transverse cutting edge 13, and the second straight line 153 being spaced apart from the main cutting edge 122.

[0044] In this embodiment, the extension direction of the first straight line 152 is oblique to the extension direction of the chisel edge 13, the extension direction of the second straight line 153 is oblique to the extension direction of the main cutting edge 122, and the end of the second straight line 153 away from the chisel edge 13 intersects with the outer edge of the drill tip 1. The first processing area 14 and the second processing area 15 are located on both sides of the main cutting edge 122, respectively.

[0045] Thus, by setting a second microtexture 151 in the second processing area 15, which is connected to both the chisel edge 13 and the main cutting edge 122, the contact area between the first flank face 121 and the PCB board can be reduced, the actual contact area between the friction pairs can be reduced, and the adhesive wear between the interfaces can be reduced. The second microtexture 151 is evenly distributed along the cutting force direction, making the chip discharge channel smoother and improving the coating adhesion in the area of ​​the first flank face 121 near the chisel edge 13 and the main cutting edge 122. The second microtexture 151 can capture and store wear particles in the cutting process, reduce coating wear, and improve the performance of the coating in the cutting process. The first processing area 14 and the second processing area 15 can enhance the structural strength on both sides of the main cutting edge 122 and improve the wear resistance of the coated drill bit.

[0046] It is understandable that the extension directions of the first straight line 152 and the second straight line 153 can be adjusted according to the setting positions of the transverse cutting edge 13 and the main cutting edge 122, which will not be elaborated here.

[0047] See Figure 3 In some embodiments, the first straight line 152 and the second straight line 153 are smoothly transitioned.

[0048] In this way, chip accumulation and stress concentration can be avoided at the connection between the first straight line 152 and the second straight line 153, allowing the chips to be smoothly discharged along the transition surface, reducing the long-term frictional contact between the chips and the first flank face 121, avoiding adhesion and wear, making the coating in the second machining area 15 more uniformly stressed during drilling, avoiding coating cracking or peeling due to excessive local stress, and improving the bonding strength between the coating and the first flank face 121.

[0049] It is understandable that the first straight line 152 and the second straight line 153 can also intersect directly. The connection method between the first straight line 152 and the second straight line 153 can be adjusted according to actual needs, which will not be elaborated here.

[0050] See Figure 3 In some embodiments, the distance between the first straight line 152 and the transverse blade 13 gradually increases along the direction close to the main cutting edge 122, and the distance between the second straight line 153 and the main cutting edge 122 gradually increases along the direction away from the transverse blade 13.

[0051] That is, the distance between the end of the first straight line 152 facing the second straight line 153 and the transverse cutting edge 13 is greater than the distance between the end of the first straight line 152 facing away from the transverse cutting edge 13, and the distance between the end of the second straight line 153 facing away from the first straight line 152 and the main cutting edge 122 is greater than the distance between the end of the second straight line 153 facing the first straight line 152 and the transverse cutting edge 13.

[0052] In this way, the first microtexture 141 and the second microtexture 151 can be prevented from affecting the structural strength of the chisel edge 13 and the main cutting edge 122, which facilitates the discharge of chips and prevents chips from accumulating in the first processing area 14 and the second processing area 15, thereby improving the coating bonding stability. Compared with making the first straight line 152 equidistant from the chisel edge 13 and the second straight line 153 equidistant from the main cutting edge 122, the uniformity of the force on the drill tip 1 can be improved, local stress concentration can be avoided, and the overall performance of the coated drill bit can be improved.

[0053] It is understandable that the first straight line 152 can also be parallel to the chisel edge 13, and the second straight line 153 can also be parallel to the main cutting edge 122. The relative positions of the first straight line 152 and the chisel edge 13, and the relative positions of the second straight line 153 and the chisel edge 13 can be adjusted according to actual needs, which will not be elaborated here.

[0054] See Figure 3 In some embodiments, the angle between the first straight line 152 and the transverse cutting edge 13 is α, and satisfies 3°≤α≤10°, and the angle between the second straight line 153 and the main cutting edge 122 is β, and satisfies 15°≤β≤30°.

[0055] In this embodiment, the angle α between the first straight line 152 and the transverse cutting edge 13 can be any value between 3° and 10° or any range between any two values, such as 3°, 5°, 7°, 9°, 10°, etc.; the angle β between the second straight line 153 and the main cutting edge 122 can be any value between 15° and 30° or any range between any two values, such as 15°, 20°, 25°, 30°, etc.

[0056] In this way, the second microtexture 151 can disperse contact stress, avoid interference with the cutting performance of the chisel edge 13, improve coating adhesion, realize the storage and containment of abrasive chips, reduce the amount of abrasive chips in the interface, and reduce the contact area between the cutting edge 12 and the PCB board, thereby reducing abrasive wear and adhesive wear between the interfaces. The processing area formed by the first straight line 152 and the chisel edge 13 can provide a guide channel for cutting at the chisel edge 13. The processing area formed by the second straight line 153 and the main cutting edge 122 can reduce interface friction and avoid affecting the structural strength of the main cutting edge 122.

[0057] Understandably, the angle α between the first straight line 152 and the chisel edge 13 cannot be too small, as this would result in a narrower chip discharge channel between the first straight line 152 and the chisel edge 13, which would be detrimental to chip removal. Similarly, the angle β between the second straight line 153 and the main cutting edge 122 cannot be too small, as this would result in a narrower chip discharge channel between the second straight line 153 and the main cutting edge 122. Furthermore, the angles α between the first straight line 152 and the chisel edge 13 and β between the second straight line 153 and the main cutting edge 122 cannot be too large, as this would result in an excessively large area of ​​the second machining area 15, which would be detrimental to machining.

[0058] See Figure 3 In some embodiments, the cutting edge face 12 further includes a second flank face 123. The first flank face 121 and the second flank face 123 intersect to form a center line 124. The center line 124 intersects with the chisel edge 13 to form a drill tip 125. The first straight line 152 intersects with the center line 124 to form a first point 154. The second straight line 153 intersects with the outer peripheral surface of the drill tip 1 to form a second point 155. The core thickness of the drill tip 1 is L. The distance between the first point 154 and the drill tip 125 is L1 along the direction perpendicular to the center line 124, that is, the radial direction of the drill tip 1. The distance between the second point 155 and the extension line of the main cutting edge 122 is L2, and satisfies L / 10≤L1≤L / 4≤L2≤L / 2.

[0059] In this embodiment, there are two second flank faces 123, two first flank faces 121 are centrally symmetrical about the drill tip 125, and two second flank faces 123 are centrally symmetrical about the drill tip 125.

[0060] In this way, the transverse cutting edge 13, the main cutting edge 122, and the center line 124 of the drill tip 1 have sufficient structural strength, and the second processing area 15 can cover the high-stress area around the drill tip 125, preventing the coating from peeling off due to stress concentration, improving the coating adhesion, reducing friction between interfaces, avoiding adhesive wear, improving the overall performance of the coated drill, extending its service life, and improving the processing accuracy of PCB boards.

[0061] Understandably, the distance L1 between the first point 154 and the drill tip 125 cannot be too small. If it is too small, the distance between the first point 154 and the chisel edge 13 will be too close, affecting the structural strength of the chisel edge 13. The distance L1 between the first point 154 and the drill tip 125 cannot be too large either. If it is too large, the distance between the first point 154 and the chisel edge 13 will be too far, increasing the area of ​​the first machining area 14, which is not conducive to machining. The distance L2 between the second point 155 and the extension line of the main cutting edge 122 cannot be too small. If it is too small, the distance between the second point 155 and the main cutting edge 122 will be too close, affecting the structural strength of the main cutting edge 122. The distance L2 between the second point 155 and the extension line of the main cutting edge 122 cannot be too large either. If it is too large, it will affect the structural strength of the center line 124.

[0062] See Figure 1 and Figure 2 In some embodiments, the extension direction of the first machining area 14 is parallel to the extension direction of the main cutting edge 122. That is, the edge of the first machining area 14 on the side away from the main cutting edge 122 is equidistant from the main cutting edge 122.

[0063] In this embodiment, the two ends of the first processing area 14 intersect with the second back face 123 and the edge of the drill tip 1, respectively.

[0064] In this way, the first microtexture 141 filled in the first machining area 14 can reduce the contact length between the drill tip 1 and the chip, reduce the friction between the chip and the rake face 11, reduce the wear on the coated drill bit, improve the cutting performance, facilitate the removal of chips, reduce the adhesion of chips, improve the wear resistance of the coated drill bit, and extend its service life; the first microtexture 141 can improve the roughness of the rake face 11 and improve the interfacial bonding strength between the coating and the rake face 11.

[0065] Alternatively, in some embodiments, the extension direction of the first processing area 14 is obliquely intersected with the extension direction of the main cutting edge 122 to increase the width of the chip removal channel, so as to facilitate the rapid breaking and discharge of chips and avoid the accumulation of chips on the rake face 11.

[0066] See Figure 2 In some embodiments, the diameter of the drill tip 1 is φ, and the vertical distance between the edge of the first processing area 14 away from the main cutting edge 122 and the main cutting edge 122 (that is, the width of the first processing area 14) is L3, and satisfies φ / 4≤L3<φ / 2.

[0067] In this way, the first microtexture 141 can be set at the intersection of the main cutting edge 122 and the rake face 11, avoiding friction between the chips and the rake face 11 and stress concentration that would cause the coating to wear off, reducing the interfacial friction coefficient, reducing adhesive wear, and ensuring the cutting efficiency of the main cutting edge 122. This makes the force in the first machining area 14 more uniform, improves the interfacial bonding strength between the coating and the rake face 11, and helps the first microtexture 141 capture and store wear particles during the cutting process, thereby improving the cutting performance of the coated drill bit.

[0068] Understandably, the vertical distance L3 between the edge of the first machining area 14 away from the main cutting edge 122 and the main cutting edge 122 should not be too small. If it is too small, the first machining area 14 will be too narrow and it will be difficult to cover the main friction area between the rake face 11 and the chip. The vertical distance L3 between the edge of the first machining area 14 away from the main cutting edge 122 and the main cutting edge 122 should not be too large. If it is too large, the first machining area 14 will be too wide and it will be difficult to machine the first microtexture 141.

[0069] See Figures 4 to 7 In some embodiments, the first microtexture 141 is at least one of a microgroove array and a micropit array, and the second microtexture 151 is at least one of a microgroove array and a micropit array.

[0070] In this embodiment, the microgroove array is arranged in one of the following ways: horizontal, vertical, or cross arrangement, and the micro-dimple array is a dot matrix array, so that the first microtexture 141 and the second microtexture 151 are arranged in a regular interval.

[0071] In this way, the microgroove array can form a continuous chip removal channel, avoiding chip accumulation, reducing interfacial adhesive wear during drilling, and increasing the interfacial bonding strength between the coating and the rake face 11 and the first flank face 121, thereby improving the wear resistance of the coated drill bit; the micro-pit array can capture and store wear particles during the cutting process, reducing coating wear and improving the coating's performance in cutting.

[0072] It is understandable that the arrangement of microgroove arrays and micropit arrays can be adjusted according to actual needs, and will not be listed in detail here.

[0073] See Figures 4 to 7In some embodiments, when the first microtexture 141 is a microgroove array, the cross-sectional shape of the microgroove array is at least one of a rectangle, a triangle, and a semicircle; when the first microtexture 141 is a micropit array, the cross-sectional shape of the micropit array is at least one of a rectangle and a semicircle; when the second microtexture 151 is a microgroove array, the cross-sectional shape of the microgroove array is at least one of a rectangle, a triangle, and a semicircle; when the second microtexture 151 is a micropit array, the cross-sectional shape of the micropit array is at least one of a rectangle and a semicircle.

[0074] Thus, the first microtexture 141 and the second microtexture 151 have a regular and continuous array of microgrooves or micropits, which can increase the contact area between the first microtexture 141, the second microtexture 151 and the coating, improve the coating adhesion, and uniformly disperse stress. This is beneficial for storing wear debris, reducing abrasive wear and adhesive wear between interfaces, and reducing coating wear, thereby improving the coating's performance in cutting and machining, and ultimately improving the overall performance of the coated drill bit.

[0075] It is understood that the cross-sectional shapes of the microgroove arrays of the first microtexture 141 and the second microtexture 151 can be the same or different, and the micro-pit arrays of the first microtexture 141 and the second microtexture 151 can be the same or different. The morphology of the first microtexture 141 and the second microtexture 151 can be adjusted according to actual needs. The cross-sectional shapes of the microgroove arrays and the micro-pit arrays of the first microtexture 141 and the second microtexture 151 can be the same or a mixture of different shapes.

[0076] It should be noted that the coated drill bit is either a welded drill bit or a whole drill bit. The coated drill bit can be a single-edged drill bit or a double-edged drill bit. When the coated drill bit is a double-edged drill bit, the grooving method of the peripheral cutting part 2 can be a double-edged single groove, a double-edged double groove, or a double-edged parallel groove.

[0077] See Figure 8 The present invention also provides a method for processing coated drilling tools, applicable to coated drilling tools, the processing method comprising:

[0078] S1. Process the raw bar stock into semi-finished bar stock;

[0079] S2. A spiral groove is made on the semi-finished bar stock and then ground to a point to form the drill tip 1;

[0080] S3. A composite structure of the first microtexture 141 and / or the second microtexture 151 and the coating is formed in the first processing area 14 and / or the second processing area 15, respectively.

[0081] In step S1, when the coated drill bit is a welded drill bit, the raw material bar is welded to form the peripheral cutting edge 2 and the shank. The welded position is ground, and then the outer circle and step difference are ground to process it into a semi-finished bar.

[0082] When the coated drill bit is a whole drill bit, the raw material bar is processed into a semi-finished bar after the outer circle is ground and the step difference is adjusted.

[0083] Step S3 includes: laser processing a first microtexture 141 and / or a second microtexture 151 in the first processing area 14 of the rake face 11 and / or the second processing area 15 of the first flank face 121 respectively; coating the coated drill bit to obtain the finished coated drill bit.

[0084] It should be noted that the coating process on the coated drill bit can be performed before or after the processing of the first microtexture 141 and the second microtexture 151.

[0085] Example 2

[0086] In Embodiment 2, the same or corresponding components as in Embodiment 1 are referred to using the same reference numerals as in Embodiment 1. For simplicity, only the differences between Embodiment 2 and Embodiment 1 are described.

[0087] See Figure 9 The first straight line 152, the transverse cutting edge 13, the main cutting edge 122 and the center line 124 enclose the second machining area 15, and the width of the second machining area 15 gradually increases along the direction close to the main cutting edge 122.

[0088] This improves the coating adhesion at the intersection of the first flank face 121 and the transverse cutting edge 13, reduces abrasive wear between interfaces, reduces the contact area between the first flank face 121 and the PCB board, reduces adhesive wear between interfaces, and extends the service life of the coated drill bit.

[0089] Example 3

[0090] In Embodiment 3, the same or corresponding components as in Embodiment 1 are referred to using the same reference numerals as in Embodiment 1. For simplicity, only the differences between Embodiment 3 and Embodiment 1 are described.

[0091] See Figure 10 The second machining area 15 is formed by the second straight line 153, the chisel edge 13, the main cutting edge 122 and the outer peripheral surface of the drill tip 1. The width of the second machining area 15 gradually increases in the direction away from the chisel edge 13.

[0092] This improves the coating adhesion at the intersection of the first flank face 121 and the main cutting edge 122, stores and accommodates broken glass fibers and filler particles during drilling, reduces the amount of wear debris in the interface, and extends the service life of the coated drill bit.

[0093] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A coated drilling tool, characterized in that, It includes a drill tip (1), which includes a rake face (11) and a cutting edge face (12). There are two cutting edge faces (12), which intersect to form a chisel edge (13). The cutting edge face (12) includes a first flank face (121), which intersects with the rake face (11) to form a main cutting edge (122). The drill tip (1) further includes a first machining area (14), which is disposed on the rake face (11). The first machining area (14) intersects with the main cutting edge (122). A first microtexture (141) is provided in the first machining area (14), and / or, The drill tip (1) also includes a second processing area (15), which is disposed on the first flank face (121). The second processing area (15) intersects with the chisel edge (13) and the main cutting edge (122). A second microtexture (151) is provided in the second processing area (15).

2. The coated drilling tool according to claim 1, characterized in that, The drill tip (1) includes a second processing area (15), which includes a first straight line (152) and a second straight line (153). The first straight line (152) is spaced apart from the transverse cutting edge (13), and the second straight line (153) is spaced apart from the main cutting edge (122).

3. The coated drilling tool according to claim 2, characterized in that, The first straight line (152) and the second straight line (153) are smoothly transitioned.

4. The coated drilling tool according to claim 2, characterized in that, Along the direction close to the main cutting edge (122), the distance between the first straight line (152) and the transverse cutting edge (13) gradually increases; and / or, along the direction away from the transverse cutting edge (13), the distance between the second straight line (153) and the main cutting edge (122) gradually increases.

5. The coated drilling tool according to claim 2, characterized in that, The angle between the first straight line (152) and the transverse cutting edge (13) is α, and satisfies 3°≤α≤10°; and / or, the angle between the second straight line (153) and the main cutting edge (122) is β, and satisfies 15°≤β≤30°.

6. The coated drilling tool according to claim 2, characterized in that, The cutting edge face (12) further includes a second flank face (123). The first flank face (121) and the second flank face (123) intersect to form a center line (124). The center line (124) intersects with the chisel edge (13) to form a drill tip (125). The first straight line (152) intersects with the center line (124) to form a first point (154). The second straight line (153) intersects with the outer peripheral surface of the drill tip (1) to form a second point (155). The core thickness of the drill tip (1) is L. The distance between the first point (154) and the drill tip (125) is L1. Along the direction perpendicular to the center line (124), the distance between the second point (155) and the extension line of the main cutting edge (122) is L2, and L / 10≤L1≤L / 4≤L2≤L / 2 are satisfied.

7. The coated drilling tool according to claim 1, characterized in that, The drill tip (1) includes a first processing area (14), the diameter of the drill tip (1) is φ, the vertical distance between the edge of the first processing area (14) away from the main cutting edge (122) and the main cutting edge (122) is L3, and satisfies φ / 4≤L3<φ / 2.

8. The coated drilling tool according to any one of claims 1-7, characterized in that, The drill tip (1) includes a first processing area (14), wherein the first microtexture (141) is at least one of a microgroove array and a micropit array; and / or, the drill tip (1) includes a second processing area (15), wherein the second microtexture (151) is at least one of a microgroove array and a micropit array.

9. The coated drilling tool according to claim 8, characterized in that, When the first microtexture (141) is the microgroove array, the cross-sectional shape of the microgroove array is at least one of rectangle, triangle, and semicircle; when the first microtexture (141) is the micropit array, the cross-sectional shape of the micropit array is at least one of rectangle and semicircle; and / or, when the second microtexture (151) is the microgroove array, the cross-sectional shape of the microgroove array is at least one of rectangle, triangle, and semicircle; when the second microtexture (151) is the micropit array, the cross-sectional shape of the micropit array is at least one of rectangle and semicircle.

10. A processing method, characterized in that, The coating method, applied to any one of claims 1-9, comprises: S1. Process the raw bar stock into semi-finished bar stock; S2. A spiral groove is opened on the semi-finished bar stock and the tip is ground to form the drill tip (1); S3. Form composite structures of the first microtexture (141) and / or the second microtexture (151) and the coating in the first processing area (14) and / or the second processing area (15), respectively.

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