Micro-diameter coating drill bit

Abstract

The utility model relates to the technical field of drill bits, and particularly discloses a micro-diameter coating drill bit which comprises a drill point and a drill handle, a spiral curved surface forming groove is formed in the surface of the drill point, cutting edges are formed on the two sides of the edge of the curved surface forming groove, and a TAC coating is coated on the surface of the drill point. Due to the arrangement, the cutting edges of the micro-diameter coating drill bit have high rigidity and hardness, the lubrication degree of the surface of the drill point can be increased, and the friction coefficient is low, so that chip removal is smoother when the drill bit conducts drilling machining on a ceramic thread pin jig capable of being cut, the machining precision and stability of drilling are improved, and the service life of the drill bit is prolonged. Therefore, the drilling quality is guaranteed, and the service life of the drill bit is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of drill bits, in particular to a micro-diameter coating drill bit. Background Art

[0002] The wire pin fixture test is a test method for testing electronic devices. Its principle is to insert the test pin into the pin hole on the circuit board, and then detect the electrical signal of the pin through the test instrument to determine whether the pin is connected normally. The more powerful the chip is and the higher the integration is, the smaller the size of the pin hole is and the higher the precision is. This puts higher requirements on the extremely small diameter drill used in processing. Machinable ceramics have become the first choice for wire pin fixture materials due to their excellent comprehensive performance, but this material is strong, and the existing drill bits are formed by manual grinding or importing "straight angle" contour drawings to form the grinding wheel, so the smoothness and stability of the groove and blade cannot be guaranteed. At the same time, due to the small diameter of the drill needle, when the drill bit is drilling the machinable ceramic wire pin fixture, the groove cannot meet the requirements of rigidity and chip removal performance at the same time, resulting in the inability to achieve a stable and high-precision drilling process for the machinable ceramic wire pin fixture. Utility Model Content

[0003] The utility model aims to provide a micro-diameter coating drill bit to solve the above-mentioned technical problems.

[0004] To achieve the above purpose, the technical solution of the utility model is: a micro-diameter coated drill bit, including a drill needle and a drill shank, the surface of the drill needle is provided with a spiral curved surface forming groove, cutting edges are formed on both sides of the edge of the curved surface forming groove, and the surface of the drill needle is coated with TAC coating.

[0005] Preferably, the curvature of the curved surface of the curved surface forming groove gradually increases from one side edge to the other side edge.

[0006] Preferably, there are two curved surface forming grooves, and the helix angle of the curved surface forming grooves ranges from 30° to 45°.

[0007] Preferably, the diameter of the drill needle ranges from 0.03 to 0.1 mm.

[0008] Preferably, the drill needle is a carbide drill needle, and the blade length of the drill needle ranges from 0.36 to 1.2 mm.

[0009] Preferably, a tip angle is formed at the distal end of the drill needle, and the angle range of the tip angle is 90° to 130°.

[0010] Preferably, the thickness of the TAC coating is in the range of 100 to 300 nm.

[0011] Preferably, the drill needle and the drill handle are coaxial and sequentially provided with a first frustum, a cylinder, and a second frustum, and the diameter of the cylinder is the same as the maximum end diameter of the first frustum and the minimum end diameter of the second frustum.

[0012] Preferably, the curved groove is formed by machining the surface of the drill needle with a cambered grinding wheel.

[0013] Preferably, the two coaxial and opposite circular end faces on the curved grinding wheel are respectively a first circular end face and a second circular end face, the radius of the first circular end face is smaller than the radius of the second circular end face, and the edges of the first circular end faces are grinding curved surfaces, and the curved surface forming groove is formed by machining the grinding curved surface of the curved grinding wheel on the surface of the drill bit.

[0014] The utility model has the following beneficial effects:

[0015] The utility model comprises a drill needle and a drill handle, the surface of the drill needle is provided with a spiral curved surface forming groove, cutting edges are formed on both sides of the edge of the curved surface forming groove, and the surface of the drill needle is coated with a TAC coating. This arrangement enables the cutting edge of the micro-diameter coated drill bit of the utility model to have higher rigidity and hardness, and can increase the lubricity of the drill needle surface, and has a low friction coefficient, so that the drill bit can remove chips more smoothly when drilling a cuttable ceramic wire needle fixture, thereby improving the processing accuracy and stability of the drilling, thereby ensuring the drilling quality and extending the service life of the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall appearance of an embodiment of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of a drill needle according to an embodiment of the utility model;

[0018] Figure 3 A cross-sectional view of the structure of a drill needle according to an embodiment of the utility model;

[0019] Figure 4 It is a front view of the curved grinding wheel according to an embodiment of the utility model.

[0020] The accompanying drawings are marked with: 1 drill needle, 2 first frustum, 3 cylinder, 4 second frustum, 5 drill handle, 6 curved surface forming groove, 7 tip angle, 8 first circular end face, 9 second circular end face, 10 grinding curved surface, 11 cutting edge. DETAILED DESCRIPTION

[0021] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0022] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] See also Figure 1-4 As shown, as an embodiment of the utility model, a micro-diameter coated drill bit is provided, which is specially used for drilling holes of a cuttable ceramic wire needle fixture. The micro-diameter coated drill bit comprises a drill needle 1 and a drill shank 5. A spiral curved surface forming groove 6 is provided on the surface of the drill needle 1. Cutting edges 11 are formed on both sides of the edge of the curved surface forming groove 6. The surface of the drill needle 1 is coated with a TAC coating. This arrangement enables the cutting edge 11 of the micro-diameter coated drill bit of the utility model to have higher rigidity and hardness, and can increase the lubricity of the surface of the drill needle 1, and has a low friction coefficient, so that the drill bit can remove chips more smoothly when drilling holes of a cuttable ceramic wire needle fixture, thereby improving the processing accuracy and stability of the drilling, thereby ensuring the drilling quality and extending the service life of the drill bit.

[0025] In this embodiment, the curvature of the curved surface of the curved forming groove 6 gradually increases from one edge to the other edge, so that the chips generated by drilling can quickly slide out from the side with smaller curvature of the curved surface of the curved forming groove 6 to the side with larger curvature, thereby improving the smoothness and efficiency of chip removal and avoiding the accumulation of chips in the curved forming groove 6.

[0026] In this embodiment, there are two curved surface forming grooves 6, and the angle b of the helix angle of the curved surface forming groove 6 is in the range of 30 to 45°, specifically 30°, which can ensure that the curved surface forming groove 6 has good chip removal performance, and at the same time make the cutting resistance of the cutting edge 11 on the side of the curved surface forming groove 6 smaller, thereby avoiding chipping and breakage.

[0027] In this embodiment, the diameter of the drill needle 1 ranges from 0.03 to 0.1 mm, so as to meet the processing requirements of different micro holes of the cuttable ceramic wire needle fixture. Preferably, the diameter L1 of the drill needle 1 is 0.08 mm.

[0028] In this embodiment, the total length L3 of the drill bit is 38 mm, the drill needle 1 is a carbide drill needle, specifically a tungsten steel drill needle, the blade length L2 of the drill needle 1 ranges from 0.36 to 1.2 mm, and the diameter L4 of the drill shank 5 ranges from 3 to 3.2 mm. Specifically, the total length L5 of the drill needle 1 is 1.06 mm, the blade length L2 of the drill needle 1 is 0.96 mm, and the diameter L4 of the drill shank 5 is 3.1 mm, that is, the blade length L2 of the drill needle 1 is 12 times the diameter L1 of the drill needle 1, ensuring the best cutting effect.

[0029] In this embodiment, a tip angle 7 is formed at the end of the drill needle 1, and the angle a of the tip angle 7 ranges from 90° to 130°, specifically 120°, to ensure that the drill needle 1 can quickly open a hole in a cuttable ceramic wire needle fixture.

[0030] In this embodiment, the thickness of the TAC coating ranges from 100 to 300 nm. Specifically, the thickness of the TAC coating is set to 200 nm, which can ensure that the TAC coating covers the surface of the drill needle 1 without affecting the normal use of the drill needle 1. The TAC coating is coated on the surface of the drill needle 1 using an ion sputtering process, so that the TAC coating and the drill needle 1 are firmly combined. Specifically, the TAC coating is coated on the surface of the drill needle 1 using a graphite target through an ion sputtering process, ensuring that the combination of the TAC coating and the drill needle 1 is more firm and stable.

[0031] In this embodiment, the drill needle 1 and the drill shank 5 are coaxial and sequentially provided with a first frustum 2, a cylinder 3, and a second frustum 4. The diameter of the cylinder 3 is the same as the maximum end face diameter of the first frustum 2 and the minimum end face diameter of the second frustum 4. The minimum end face diameter of the first frustum 2 is the same as the diameter of the drill needle 1, and the maximum end face diameter of the second frustum 4 is the same as the diameter of the drill shank 5, thereby achieving a stable transition connection between the drill needle 1 and the drill shank 5.

[0032] In this embodiment, the curved surface forming groove 6 is formed on the surface of the drill bit 1 by using a curved grinding wheel.

[0033] In this embodiment, the two coaxial and opposite circular end faces on the arc grinding wheel are respectively the first circular end face 8 and the second circular end face 9, the radius of the first circular end face 8 is smaller than the radius of the second circular end face 9, and the edges of the first circular end faces 8 and the edges of the first circular end faces 8 are grinding curved surfaces 10, and the curved surface forming groove 6 is formed on the surface of the drill bit 1 by the grinding curved surface 10 of the arc grinding wheel.

[0034] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes made to the present invention in form and detail, without departing from the spirit and scope of the present invention as defined in the appended claims, shall fall within the scope of protection of the present invention.

Claims

1. A micro-diameter coated drill bit, characterized in that: The drill needle comprises a drill bit and a drill handle. A spiral curved groove is formed on the surface of the drill bit. Cutting edges are formed on both sides of the edge of the curved groove. The surface of the drill bit is coated with a TAC coating. The curvature of the curved groove gradually increases from one edge to the other edge.

2. The micro-diameter coated drill bit according to claim 1, characterized in that: There are two curved surface forming grooves, and the helix angle of the curved surface forming grooves ranges from 30° to 45°.

3. The micro-diameter coated drill bit according to claim 1, characterized in that: The diameter of the drill needle ranges from 0.03 to 0.1 mm.

4. The micro-diameter coated drill bit according to claim 1, characterized in that: The drill needle is a carbide drill needle, and the blade length of the drill needle ranges from 0.36 to 1.2 mm.

5. The micro-diameter coated drill bit according to claim 1, characterized in that: A tip angle is formed at the distal end of the drill needle, and the angle range of the tip angle is 90° to 130°.

6. The micro-diameter coated drill bit according to claim 1, characterized in that: The thickness of the TAC coating ranges from 100 to 300 nm.

7. The micro-diameter coated drill bit according to claim 1, characterized in that: The drill needle and the drill handle are coaxially provided with a first truncated cone, a cylinder and a second truncated cone in sequence. The diameter of the cylinder is the same as the maximum end face diameter of the first truncated cone and the minimum end face diameter of the second truncated cone.

8. The micro-diameter coated drill bit according to claim 1, characterized in that: The curved surface forming groove is formed by machining the surface of the drill needle with a curved surface grinding wheel.

9. The micro-diameter coated drill bit according to claim 8, characterized in that: The two coaxial and opposite circular end faces on the cambered grinding wheel are respectively a first circular end face and a second circular end face, the radius of the first circular end face is smaller than the radius of the second circular end face, and the edges of the first circular end faces are grinding curved surfaces, and the curved surface forming groove is formed by machining the grinding curved surface of the cambered grinding wheel on the surface of the drill bit.

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