Drilling tool capable of restraining wire winding and machining method of drilling tool

Abstract

The invention discloses a drilling tool for restraining wire winding and a machining method thereof.The drilling tool comprises a drilling part, the drilling part is provided with a spiral chip groove and a chip breaker groove in the axial direction, an edge cutter is formed on the circumferential face of the drilling part, the chip breaker groove is connected between the chip groove and the edge cutter, a drill tip part is formed at the tail end of the drilling part and comprises a first rear cutter face, and the first rear cutter face is provided with a second rear cutter face; the chip groove and the first rear tool face intersect to form a main cutting edge, the edge tool and the first rear tool face intersect to form a first side edge, and the chip breaking groove and the first rear tool face intersect to form a chip breaking edge connected between the main cutting edge and the first side edge. Wherein an included angle is formed between the chip breaking edge and the main cutting edge, and the helical angle of the chip breaking groove is smaller than that of the chip discharging groove. According to the drilling tool capable of inhibiting wire winding, chip breaking and chip removal are taken into consideration while wire winding is inhibited, the product consistency is guaranteed, and the production efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of machining tools, and in particular to a drilling tool capable of suppressing wire entanglement and a machining method thereof. Background Art

[0002] With the rapid development of intelligent and highly integrated electronic products, the hole diameter of printed circuit boards (PCBs) has been reduced and the number of layers and hole wall requirements have increased in order to integrate more functions. When processing micro holes in PCBs with a high number of layers, due to the high copper content, it is easy to cause wire entanglement, resulting in needle breakage and affecting processing quality.

[0003] At present, the industry suppresses wire entanglement by reducing the helix angle of the chip groove or adding cross-edge grinding to break chips. The former can increase the deformation of the chips and make them more likely to break, which is beneficial to suppress wire entanglement, but not conducive to chip removal. When the cutting temperature is high, the resin in the PCB is easy to stick to the copper wire, resulting in poor chip removal, which affects the quality of the hole wall and causes the needle to break. Therefore, although this method is effective to a certain extent, it is difficult to take into account both chip breaking and chip removal; the latter can change the flow direction of some chips and suppress wire entanglement, but it will increase the wedge angle at the cross-edge, greatly increase the drilling resistance of the drill bit, and easily cause the needle to break and the quality of the hole wall to deteriorate. In addition, it is difficult to grind the cross-edge of a tiny drill bit. During grinding, due to the small size of the groove, the grinding wheel needs to be ground to a small enough size to ensure that the cross-edge grinding groove is processed without grinding the side wall of the drill bit. However, the grinding wheel is easy to wear, resulting in deformation of the cross-edge grinding groove, making it difficult to ensure product consistency. Therefore, in order to ensure product consistency, it is usually necessary to significantly increase the dressing frequency of the chisel edge grinding wheel, which is not conducive to improving production efficiency or controlling production costs. Summary of the invention

[0004] The purpose of the present application is to provide a drilling tool and a processing method thereof for suppressing wire entanglement, which takes into account chip breaking and chip removal while suppressing wire entanglement, and is conducive to ensuring product consistency and improving production efficiency.

[0005] In order to achieve the above-mentioned purpose, the present application provides a drilling tool for suppressing wire winding, comprising a drilling portion, wherein the drilling portion is provided with a spiral chip groove and a chip breaker groove along the axial direction, a side cutter is formed on the circumferential surface of the drilling portion, the chip breaker groove is connected between the chip groove and the side cutter, a drill tip portion is formed at the end of the drilling portion, the drill tip portion comprises a first flank face, the chip groove intersects with the first flank face to form a main cutting edge, the side cutter intersects with the first flank face to form a first side edge, and the chip breaker groove intersects with the first flank face to form a chip breaker edge connected between the main cutting edge and the first side edge;

[0006] Wherein, an angle is formed between the chip breaking edge and the main cutting edge, and the helix angle of the chip breaking groove is smaller than the helix angle of the chip removal groove.

[0007] Optionally, the length of the chip breaker groove in the extending direction of the chip removal groove is greater than 0.15 times the diameter of the drilling portion.

[0008] Optionally, at least one unloading groove is provided at the chip breaker edge, wherein the unloading groove is partially formed at the chip breaker groove and partially formed at the first back tool surface, and the unloading edge is formed at the intersection of the unloading groove and the chip breaker groove.

[0009] Optionally, a wedge angle formed by the chip breaker groove and the force unloading groove is smaller than a wedge angle formed by the chip breaker groove and the first back tool surface.

[0010] Optionally, the length of the force unloading groove along the chip breaking edge is greater than 0.3 times the length of the chip breaking edge and less than the length of the chip breaking edge.

[0011] Optionally, the length of the main cutting edge is 0.1-0.75 times the radius of the drilling portion.

[0012] Optionally, the drill tip portion includes a drill tip and two first flank faces and two second flank faces symmetrical about the drill tip, each of the first flank faces is connected to one of the second flank faces via a center line, and is connected to another second flank face via a transverse edge, the two center lines intersect at the drill tip, the two transverse edges intersect at the drill tip, the number of the chip grooves is two, and each of the chip grooves intersects with the corresponding first flank face and the second flank face, respectively, to form the main cutting edge and the flank edge that intersect at the transverse edge.

[0013] Optionally, an angle between the main cutting edge and the center line located on the same first flank surface is greater than 5° and less than 55°.

[0014] Optionally, an angle between the main cutting edge and the center line located on the same first flank surface is greater than an angle between the chip breaking edge located on the same first flank surface and the center line located on the same first flank surface.

[0015] In order to achieve the above-mentioned object, the present application also provides a method for processing a drilling tool capable of suppressing wire winding, which is used for processing the above-mentioned drilling tool, comprising:

[0016] The parameters of the chip removal groove, the chip breaker groove, the side cutter and the main cutting edge are preset; the helix angle of the chip breaker groove is smaller than the helix angle of the chip removal groove;

[0017] According to the preset parameters of the chip groove and the side cutter, the chip groove and the side cutter are machined in the axial direction on the bar to be machined;

[0018] According to the preset parameters of the main chip edge, grinding the end of the drilling portion to form the drill tip portion, and determining the intersection position of the main chip edge and the chip breaker edge;

[0019] According to the intersection position and preset parameters of the chip breaker groove, parts of the chip breaker groove and the edge cutter are ground to form the chip breaker groove and the chip breaker edge.

[0020] In the embodiment of the present application, on the one hand, the main cutting edge and the chip breaker edge form a certain angle, which can divert the chips, thereby suppressing the long metal wire and reducing the wire winding; on the other hand, a chip breaker groove with a smaller helix angle is set between the chip groove and the edge cutter, increasing the cutting front angle of the chip breaker edge, so that the chips can be broken under the force of deformation, while the chip removal capacity of the chip groove is not affected, and the chip breaking capacity and chip removal capacity of the drilling tool are taken into account at the same time. Therefore, the present application can not only split and break chips, but also ensure the performance of chip removal, effectively reducing the possibility of wire winding in the drilling tool during operation, increasing the service life of the drilling tool, and ensuring the drilling quality of the drilling tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the end face structure of a drilling tool for suppressing wire entanglement according to an embodiment of the present application.

[0022] Figure 2 It is a schematic side structural diagram of a drilling tool for suppressing wire entanglement according to an embodiment of the present application.

[0023] Figure 3 for Figure 2 An enlarged view of part A.

[0024] Figure 4 It is a schematic diagram of the three-dimensional structure of the drilling part of the drilling tool for suppressing wire entanglement according to an embodiment of the present application.

[0025] Figure 5 This is a schematic diagram of the end face structure of a drilling tool for suppressing wire entanglement according to another embodiment of the present application.

[0026] Figure 6 This is a schematic diagram of the end face structure of a drilling tool for suppressing wire entanglement according to another embodiment of the present application.

[0027] Figure 7 This is a schematic diagram of the end face structure of a drilling tool for suppressing wire entanglement according to yet another embodiment of the present application.

[0028] Figure 8 It is a schematic diagram of the processing process of the drilling tool for suppressing wire entanglement according to an embodiment of the present application.

[0029] Fig. 9 The present invention is a flowchart of a method for manufacturing a drilling tool capable of suppressing wire entanglement according to an embodiment of the present application. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0031] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0032] It should also be noted that the directional terms such as left, right, up, and down in the embodiments of the present invention are merely relative concepts or are based on the normal use status of the product and should not be considered as restrictive.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] See also Figures 1 to 4 The embodiment of the present application discloses a drilling tool for suppressing wire winding, including a drilling portion 1, the drilling portion 1 is provided with a spiral chip groove 10 and a chip breaker groove 40 along the axial direction, a side cutter 20 is formed on the circumferential surface of the drilling portion 1, the chip breaker groove 40 is connected between the chip groove 10 and the side cutter 20, a drill tip portion 30 is formed at the end of the drilling portion 1, the drill tip portion 30 includes a first back tool face 31, the chip groove 10 intersects with the first back tool face 31 to form a main cutting edge 32, the side cutter 20 and the first back tool face 31 intersect to form a first side edge 33, and the chip breaker groove 40 and the first back tool face 31 intersect to form a chip breaker edge 34 connected between the main cutting edge 32 and the first side edge 33.

[0035] An angle is formed between the chip breaking edge 34 and the main cutting edge 32 , and the helix angle of the chip breaking groove 40 is smaller than the helix angle of the chip removal groove 10 .

[0036] In the embodiment of the present application, on the one hand, the main cutting edge 32 and the chip breaking edge 34 form a certain angle, which can divert the chips, thereby suppressing the long metal wire and reducing the wire winding; on the other hand, a chip breaker 34 with a smaller helix angle is set between the chip groove 10 and the edge cutter 20, and the cutting front angle of the chip breaker 34 is increased, so that the chips can be broken under the force of deformation, while the chip removal capacity of the chip groove 10 is not affected, and the chip breaking capacity and chip removal capacity of the drilling tool are taken into account at the same time. Therefore, the present application can not only split and break chips, but also ensure the performance of chip removal, effectively reducing the possibility of wire winding in the drilling tool during operation, increasing the service life of the drilling tool, and ensuring the drilling quality of the drilling tool.

[0037] Specifically, the chip breaker groove 40 can be formed by grinding the side of the chip groove 10 close to the edge cutter 20. By forming the chip breaker groove 40 on the basis of the chip groove 10, the chip removal space is increased, and the performance of chip breaking and chip removal is further taken into account. Moreover, the external position of the chip breaker groove 40 can be easily repaired, which reduces the processing difficulty, is conducive to ensuring the consistency of the product, greatly facilitates the processing of micro drill bits, and is conducive to improving production efficiency and controlling production costs.

[0038] See also Figure 2 In some embodiments, the drilling tool further includes a shank portion 3 and a transition portion 2 connecting the shank portion 3 and the drilling portion 1 .

[0039] In some embodiments, the drill tip portion 30 includes a drill tip 35 and two first flank surfaces 31 and two second flank surfaces 36 symmetrically about the drill tip 35, each first flank surface 31 is connected to one second flank surface 36 via a center line 37, and is connected to another second flank surface 36 via a chisel edge 38, and the two center lines 37 and the two chisel edges 38 intersect at the drill tip 35. There are two chip flutes 10, and each chip flute 10 intersects with the corresponding first flank surface 31 and second flank surface 36 to form a main cutting edge 32 and a flank edge 11 intersecting at the chisel edge 38.

[0040] Specifically, a blade 200 connected to the first flank face 31 and the second flank face 36 is formed between the two chip flutes 10, and the blade 200 includes an edge cutter 20 and a ground back portion 21 formed by grinding on one side of the edge cutter 20, the edge cutter 20 intersects with the first flank face 31 to form a first side edge 33, and the ground back portion 21 intersects with the second flank face 36 to form a second side edge 39. The design of the ground back portion 21 can reduce the contact area between the outer wall of the drilling tool and the hole wall during drilling, reduce the friction on the hole wall, thereby improving the quality of the hole wall and reducing the torsional stress on the drilling tool.

[0041] In some embodiments, a first angle between the main cutting edge 32 and a center line 37 located on the same first flank face 31 is greater than a second angle between the chip breaker edge 34 located on the same first flank face 31 and a center line 37 located on the same first flank face 31. It is understandable that the main cutting edge 32 may be a straight line or an arc, and the chip breaker edge 34 may be a straight line or an arc, and the two may be matched as needed. When the main cutting edge 32 is a straight edge, the angle formed by the intersection of the straight line where the main cutting edge 32 is located and the center line 37 is the first angle; when the main cutting edge 32 is a curved edge, the angle formed by the intersection of the tangent of the main cutting edge 32 at the intersection of the main cutting edge 32 and the center line 37 and the center line 37 is the first angle; when the chip breaking edge 34 is a straight edge, the angle formed by the intersection of the straight line where the chip breaking edge 34 is located and the center line 37 is the second angle; when the chip breaking edge 34 is a curved edge, the angle formed by the intersection of the tangent of the chip breaking edge 34 at the intersection of the chip breaking edge 34 and the main cutting edge 32 and the center line 37 is the second angle.

[0042] In some embodiments, the included angle between the main cutting edge 32 and the center line 37 located on the same first relief surface 31 is greater than 5° and less than 55° (not shown).

[0043] In some embodiments, the length of the chip breaker 40 in the extending direction of the chip removal groove 10 is greater than 0.15 times the diameter of the drilling portion 1. Of course, the present application does not limit the length of the chip breaker 40, as long as its length is sufficient to meet the chip breaking requirement.

[0044] In some embodiments, the helix angle of the chip flute 10 is 20-60°, and the helix angle of the chip breaker 40 is 3-30° smaller than the helix angle of the chip flute 10. It is understood that the design of the specific angle can be adaptively adjusted according to actual conditions.

[0045] In some embodiments, at least one unloading groove 50 is provided at the chip breaker edge 34, the unloading groove 50 is partially formed at the chip breaker groove 40, and partially formed at the first back cutting edge 31, and the unloading groove 50 and the chip breaker groove 40 are intersected to form the unloading edge 51. By providing the unloading groove 50 on the chip breaker groove 40, the wedge angle of the chip breaker edge 34 is reduced, the drilling resistance is reduced, the needle breakage is reduced, and the processing quality is improved.

[0046] At least one unloading groove 50 is formed at the chip breaking edge 34 . The unloading groove 50 may be disposed in the middle of the chip breaking edge 34 or between the chip breaking edge 34 and the edge cutter 20 .

[0047] In addition, by designing a plurality of unloading grooves 50 of different heights, the unloading blade 51 can achieve the effect of segmented drilling, which is helpful to avoid local high temperature of the drilling tool during drilling, thereby inhibiting the wear of the drilling tool.

[0048] It is understandable that because the helix angle of the chip breaking edge 34 is smaller than the helix angle of the main cutting edge 32 , the cutting resistance at the chip breaking edge 34 is greater. Therefore, the unloading groove 50 is provided on the chip breaking edge 34 to reduce the cutting resistance at the chip breaking edge 34 .

[0049] Specifically, the wedge angle formed by the chip breaker groove 40 and the unloading groove 50 is smaller than the wedge angle formed by the chip breaker groove 40 and the first back cutting edge 31 , which is helpful to solve the problem of increased cutting resistance due to the increase of the front angle of the chip breaker groove 40 .

[0050] It should be explained that the above-mentioned wedge angle refers to the wedge angle formed in a plane perpendicular to the corresponding center line 37 .

[0051] Furthermore, a wedge angle formed by the force-releasing groove 50 and the chip breaker groove 40 is 2-20° smaller than a wedge angle formed by the chip breaker groove 40 and the first back cutting edge 31 .

[0052] In some embodiments, the length of the force-releasing groove 50 along the chip breaking edge 34 is greater than 0.3 times the length of the chip breaking edge 34 and less than the length of the chip breaking edge 34 .

[0053] In some embodiments, the length of the main cutting edge 32 is 0.1-0.75 times the radius of the drilling portion 1. Of course, the length of the main cutting edge 32 of the present application is not limited thereto.

[0054] Figures 5 to 7 Three possible examples of different main cutting edges 32, chip breaking edges 34, unloading edges 51 and unloading grooves 50 are provided, which should not be regarded as limiting the present application.

[0055] See also Figure 5 In some embodiments, the main cutting edge 32 is configured to be arc-shaped, the chip breaking edge 34 is a straight line, and the force unloading groove 50 is opened in the middle of the chip breaking edge 34 .

[0056] See also Figure 6 In some embodiments, the main cutting edge 32 is set as a straight line, the chip breaking edge 34 is a straight line, the unloading groove 50 is opened at the intersection of the chip breaking edge 34 and the first side edge 33, and the unloading edge 51 is connected to the side cutter 20.

[0057] See also Figure 7 In some embodiments, the main cutting edge 32 is configured to be arc-shaped, the chip breaking edge 34 is arc-shaped, and the force unloading groove 50 is opened in the middle of the chip breaking edge 34 .

[0058] See also Figure 8 and Fig. 9 The present application also discloses a method for processing the above-mentioned drilling tool, comprising:

[0059] S10, presetting parameters of the chip flute 10, the chip breaker 40, the side cutter 20 and the main cutting edge 32; wherein the helix angle of the chip breaker 40 is smaller than the helix angle of the chip flute 10.

[0060] S20 , according to the preset parameters of the chip groove 10 and the side cutter 20 , the chip groove 10 and the side cutter 20 are machined in the axial direction on the bar to be machined.

[0061] S30 , grinding the end of the drilling portion 1 to form a drill tip portion 30 according to preset parameters of the main chip edge 32 , and determining the intersection position of the main chip edge 32 and the chip breaking edge 34 .

[0062] S40 , grinding a portion of the chip groove 10 and the edge cutter 20 according to the intersection position and preset parameters of the chip breaker groove 40 to form the chip breaker groove 40 and the chip breaking edge 34 .

[0063] In this processing method, the main cutting edge 32 is ground and formed in one step, and no rework and adjustment is required after the chip breaker groove 40 is formed, which greatly improves the processing efficiency; the chip breaker groove 40 is further ground directly on the basis of the chip removal groove 10, and the processing difficulty is low, which is conducive to ensuring the consistency of the product, greatly facilitates the processing of micro drill bits, and is conducive to improving production efficiency and controlling production costs.

[0064] Specifically, after step S40, step S50 is also included: at least one unloading groove 50 is ground at the chip breaker edge 34, the unloading groove 50 is partially formed on the chip breaker groove 40, and partially formed on the first back cutting edge 31, and a unloading edge 51 is formed at the intersection of the unloading groove 50 and the chip breaker groove 40.

[0065] It should be understood that the above processing method is merely an optional processing method for the drilling part 1 of the drilling tool exemplified in the present application and should not be regarded as a limitation to the present application.

[0066] The above disclosure is only a preferred example of the present application, and its role is to facilitate the technical personnel in this field to understand and implement it. Of course, it cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the scope of the patent application of the present application still fall within the scope covered by the present application.

Claims

1. A drilling tool for suppressing wire entanglement, characterized in that: The drill comprises a drilling portion, wherein the drilling portion is provided with a spiral chip groove and a chip breaker groove in the axial direction, a side cutter is formed on the peripheral surface of the drilling portion, the chip breaker groove is connected between the chip groove and the side cutter, a drill tip portion is formed at the end of the drilling portion, the drill tip portion comprises a first flank face, the chip groove intersects with the first flank face to form a main cutting edge, the side cutter intersects with the first flank face to form a first side edge, and the chip breaker groove intersects with the first flank face to form a chip breaker edge connected between the main cutting edge and the first side edge; Wherein, an angle is formed between the chip breaking edge and the main cutting edge, and the helix angle of the chip breaking groove is smaller than the helix angle of the chip removal groove.

2. The drilling tool for suppressing wire entanglement according to claim 1, characterized in that: The length of the chip breaker groove in the extending direction of the chip removal groove is greater than 0.15 times the diameter of the drilling portion.

3. The drilling tool for suppressing wire entanglement according to claim 1 or 2, characterized in that: At least one unloading groove is provided at the chip breaker edge, wherein the unloading groove is partially formed at the chip breaker groove and partially formed at the first back tool surface, and an unloading edge is formed at the intersection of the unloading groove and the chip breaker groove.

4. The drilling tool for suppressing wire entanglement according to claim 3, characterized in that: A wedge angle formed by the chip breaker groove and the force unloading groove is smaller than a wedge angle formed by the chip breaker groove and the first back tool surface.

5. The drilling tool for suppressing wire entanglement according to claim 3, characterized in that: The length of the force unloading groove along the chip breaking edge is greater than 0.3 times the length of the chip breaking edge and less than the length of the chip breaking edge.

6. The wire-entanglement-suppressing drilling tool according to claim 1, characterized in that: The length of the main cutting edge is 0.1-0.75 times the radius of the drilling portion.

7. The drilling tool for suppressing wire entanglement according to claim 1, characterized in that: The drill tip portion includes a drill tip and two first flank faces and two second flank faces symmetrical about the drill tip, each of the first flank faces is connected to one of the second flank faces via a center line, and is connected to another second flank face via a transverse edge, the two center lines intersect at the drill tip, the two transverse edges intersect at the drill tip, the number of the chip grooves is two, and each of the chip grooves intersects with the corresponding first flank face and the second flank face, respectively, to form the main cutting edge and the flank edge intersecting at the transverse edge.

8. The wire-entanglement-suppressing drilling tool according to claim 7, characterized in that: An included angle between the main cutting edge and the center line located on the same first flank surface is greater than 5° and less than 55°.

9. The wire-entanglement-suppressing drilling tool according to claim 7, characterized in that: An included angle between the main cutting edge and the center line located on the same first flank surface is greater than an included angle between the chip breaker edge located on the same first flank surface and the center line located on the same first flank surface.

10. A method for processing a drilling tool for suppressing wire entanglement, characterized in that: A drilling tool for processing as claimed in claim 1, comprising: The parameters of the chip removal groove, the chip breaker groove, the side cutter and the main cutting edge are preset; the helix angle of the chip breaker groove is smaller than the helix angle of the chip removal groove; According to the preset parameters of the chip groove and the side cutter, the chip groove and the side cutter are machined in the axial direction on the bar material to be machined; According to the preset parameters of the main chip edge, grinding the end of the drilling portion to form the drill tip portion, and determining the intersection position of the main chip edge and the chip breaker edge; According to the intersection position and preset parameters of the chip breaker groove, parts of the chip breaker groove and the edge cutter are ground to form the chip breaker groove and the chip breaker edge.

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