Diamond microbit for ultramicro machining

Abstract

The utility model provides a diamond micro drill bit for ultramicro machining, which comprises a drill bit, a drill body and a drill handle which are sequentially arranged, chip grooves are arranged on the drill bit and the drill body, and the chip grooves are circumferentially and uniformly distributed along the central axis of the drill bit; positioning cutting faces are evenly distributed at the end of the drill bit, the intersecting lines of the positioning cutting faces serve as positioning cutting edges, the positioning cutting faces correspond to the chip grooves in a one-to-one mode, the positioning cutting faces are sequentially provided with first cutting faces and second cutting faces along the chip grooves, and the intersecting lines of the first cutting faces, the second cutting faces and the chip grooves serve as first cutting edges and second cutting edges respectively. Included angles between the positioning cutting surface, the first cutting surface and the second cutting surface and the central axis of the drill bit are sequentially reduced. The micro drill bit has the advantages that the positioning cutting face, the first cutting face and the second cutting face are mutually matched and complemented, and the included angles between the positioning cutting face, the first cutting face and the second cutting face and the central axis of the drill bit are sequentially reduced, so that the technical problem that an existing micro drill bit is short in service life is solved.

Description

Technical Field

[0001] This utility model relates to the field of micro-machining technology, and in particular to a diamond micro drill bit for ultra-micro machining. Background Technology

[0002] In the field of machining, drilling is a crucial process. Drill bits with a diameter of less than 1 mm are commonly referred to as micro-diameter drill bits. With the rapid development of the domestic semiconductor industry, the demand for high-precision and high-efficiency machining of hard and brittle materials is also increasing. Micro-hole machining of hard and brittle materials is generally carried out using PCD (polycrystalline diamond) micro-drills. However, when facing the precision machining of ultra-precision components in the semiconductor industry and high-hardness and brittle materials (such as single-crystal silicon, ceramics, glass, quartz, and sapphire), especially when machining micro-holes with diameters of φ0.1 to φ1.0 and length-to-diameter ratios of 10+, traditional micro-drills often face various problems during machining, including poor rigidity, easy breakage, difficulty in chip removal, decreased hole perpendicularity, and even low machining efficiency and reduced drill life. They still have significant limitations in machining technology and cannot meet the stringent requirements of modern industry for high-end components. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a diamond micro drill bit for ultra-micro machining, which solves the technical problem of short service life in existing micro drill bits.

[0004] According to an embodiment of the present invention, a diamond micro drill bit for ultra-micro machining includes a drill bit, a drill body, and a drill shank arranged sequentially. The drill bit and the drill body are provided with chip removal grooves, which are evenly distributed circumferentially along the central axis of the drill bit.

[0005] The drill bit has evenly distributed positioning cutting surfaces at its end. The intersection of these positioning cutting surfaces forms a positioning cutting edge. Each positioning cutting surface corresponds to a chip removal groove. The positioning cutting surfaces are provided with a first cutting surface and a second cutting surface in sequence along the chip removal groove. The intersection of the first cutting surface, the second cutting surface, and the chip removal groove forms the first cutting edge and the second cutting edge, respectively. The angles between the positioning cutting surface, the first cutting surface, the second cutting surface, and the drill bit's central axis decrease sequentially.

[0006] The technical principle of this utility model is as follows: the angle between the positioning cutting surface and the central axis of the drill bit is the largest, which is to increase the thickness and strength of the positioning cutting edge. This helps the drill bit resist the high stress generated during the cutting process when it first enters the workpiece, especially when machining hard materials, thus improving the service life of the drill bit.

[0007] The angles between the first and second cutting surfaces and the drill bit's central axis decrease sequentially. At this point, the drill bit has already partially penetrated the workpiece. Therefore, after reducing the angle, the thickness and strength of the first and second cutting edges decrease sequentially, but the sharpness and chip removal capability increase sequentially. This improves the drill bit's ability to remove material and avoids a short lifespan due to chip removal difficulties and poor sharpness. Furthermore, the thickness and strength of the positioning cutting edge continue to play a role during continuous drilling.

[0008] Compared with the prior art, this utility model has the following beneficial effects: by using positioning cutting surfaces with successively decreasing angles to the drill bit's central axis, and by having the first cutting surface and the second cutting surface complement each other, it solves the technical problem of the short service life of existing micro drill bits.

[0009] Furthermore, all the aforementioned positioning cutting edges converge at a single point at the center of the drill bit end, and all the aforementioned positioning cutting surfaces combine to form the cutting tip.

[0010] The traditional chisel edge structure of micro drills has been removed, and a cutting tip structure formed by a positioning cutting surface has been adopted, which improves the accuracy and stability of drill centering.

[0011] Furthermore, both the first and second cutting surfaces are inclined away from the chip removal groove, forming the back angles of the first and second cutting edges.

[0012] The inclined first and second cutting surfaces facilitate chip removal.

[0013] Furthermore, each of the chip removal grooves is provided with a connecting groove on the positioning cutting surface, and each of the connecting grooves is aligned with a positioning cutting edge.

[0014] By setting a connecting groove, the resistance of the positioning cutting edge during drilling is reduced, which can effectively slow down the wear of the tool tip.

[0015] Furthermore, the core thickness of the drill bit is 25%-35% of the drill bit diameter, and the core thickness of the cutting tip is 10%-13% of the drill bit diameter.

[0016] Furthermore, the chip removal groove is spiral-shaped, and there are three chip removal grooves. The positioning cutting surface, the first cutting surface, and the second cutting surface are all provided with three.

[0017] The traditional two-flute micro drill bit is modified into the structure of the present application with three chip removal grooves and three cutting edges, which can increase the chip removal capacity to 20%-30% of the original.

[0018] Meanwhile, three-flute drill bits bear less load on each cutting edge than two-flute drill bits when the drilling feed rate is the same, so they can withstand higher feed rates and further improve production efficiency.

[0019] Meanwhile, three-flute drill bits have a thicker core, resulting in better overall rigidity. They are more stable during drilling and less prone to wobbling. The surface finish of the hole is better than that of two-flute drill bits, and the overall strength of the drill bit is improved, reducing the risk of breakage.

[0020] Furthermore, the drill bit is made of PCD material.

[0021] Furthermore, the angle between the positioning cutting surface and the central axis of the drill bit is 50°-70°.

[0022] Furthermore, the angle between the first cutting surface and the central axis of the drill bit is 35°-45°.

[0023] Furthermore, the angle between the second cutting surface and the central axis of the drill bit is 20°-30°.

[0024] The specific values ​​of the successively decreasing positioning cutting surfaces, the first cutting surface and the second cutting surface, and the angle between them and the drill bit's central axis are, in micro drills, because the drill bit diameter itself is very small, so the design of the angle has a greater effect on improving the overall rigidity and strength of the drill bit compared to ordinary drill bits. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the diamond micro drill bit structure according to an embodiment of the present invention.

[0026] Figure 2 This is a schematic diagram of the drill bit structure according to an embodiment of the present utility model.

[0027] Figure 3 This is a schematic diagram of the drill bit end face structure according to an embodiment of the present invention.

[0028] Figure 4 This is a schematic diagram of the drill bit core thickness structure according to an embodiment of the present invention.

[0029] Figure 5 This is a side view of the drill bit structure according to an embodiment of the present invention.

[0030] In the above figures: 10, drill bit; 11, positioning cutting surface; 12, positioning cutting edge; 13, connecting groove; 20, drill body; 30, drill shank; 40, chip removal groove; 41, first cutting surface; 42, first cutting edge; 43, second cutting surface; 44, second cutting edge;

[0031] β1, back angle; E1, core thickness of the cutting tip; E2, core thickness of the drill bit. Detailed Implementation

[0032] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0033] like Figure 1-3 The diamond micro drill bit shown includes a drill bit 10, a drill body 20 and a drill shank 30 arranged in sequence. The drill bit 10 is made of PCD material. The drill bit 10 and the drill body 20 are provided with chip removal grooves 40. The chip removal grooves 40 have three grooves that are evenly distributed around the central axis of the drill bit 10. The chip removal grooves 40 are spiral-shaped and used for chip removal.

[0034] like Figure 2-3 As shown, the end of the drill bit 10 is evenly distributed with positioning cutting surfaces 11. The intersection of the positioning cutting surfaces 11 is the positioning cutting edge 12. The positioning cutting surfaces 11 correspond one-to-one with the chip removal grooves 40. The positioning cutting surfaces 11 are provided with a first cutting surface 41 and a second cutting surface 43 in sequence along the chip removal grooves 40. The intersection of the first cutting surface 41, the second cutting surface 43 and the chip removal grooves 40 are the first cutting edge 42 and the second cutting edge 44, respectively, forming a total of three cutting edges for positioning and cutting. The angles between the positioning cutting surfaces 11, the first cutting surface 41 and the second cutting surface 43 and the central axis of the drill bit 10 decrease in sequence, which ensures the strength of the drill bit 10 while improving the ability to remove material. Specifically, the positioning cutting surfaces 11, the first cutting surface 41 and the second cutting surface 43 are provided with three chip removal grooves 40 in a one-to-one correspondence.

[0035] like Figure 2-3 As shown, the positioning cutting edges 12 converge at the center of the end of the drill bit 10, and all the positioning cutting surfaces 11 combine to form the cutting tip. That is, there is no chisel edge structure, but a conical cutting tip structure, which helps the drill bit 10 to perform stable and accurate cutting positioning.

[0036] like Figure 5 As shown, both the first cutting surface 41 and the second cutting surface 43 are inclined to the side away from the chip groove 40, forming the back angle β1 of the first cutting edge 42 and the second cutting edge 44. The back angle β1 here helps to remove chips because the first cutting surface 41 and the second cutting surface 43 are inclined.

[0037] like Figure 2-4 As shown, each chip removal groove 40 is provided with a connecting groove 13 on the positioning cutting surface 11. Each connecting groove 13 is aligned with a positioning cutting edge 12, which facilitates the discharge of iron chips cut by the positioning cutting edge 12.

[0038] Specifically, the core thickness E2 of the drill bit 10 is 25%-35% of the diameter of the drill bit 10, and the core thickness E1 of the cutting tip is 10%-13% of the diameter of the drill bit 10, which makes the overall rigidity of the drill bit 10 better.

[0039] like Figure 5As shown, the angle between the positioning cutting surface 11 and the central axis of the drill bit 10 is 50°-70°, the angle between the first cutting surface 41 and the central axis of the drill bit 10 is 35°-45°, and the angle between the second cutting surface 43 and the central axis of the drill bit 10 is 20°-30°.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A diamond micro-bur for ultra-micro machining, characterized by: The drill bit, the drill body and the drill handle are sequentially arranged, the drill bit and the drill body are provided with a chip flute, and the chip flute is uniformly distributed along the central axis of the drill bit; The end of the drill bit is uniformly distributed with a positioning cutting surface, the intersection line of the positioning cutting surfaces is a positioning cutting edge, the positioning cutting surface corresponds to the chip flute one by one, the positioning cutting surface is sequentially provided with a first cutting surface and a second cutting surface along the chip flute, the intersection line of the first cutting surface, the second cutting surface and the chip flute is a first cutting edge and a second cutting edge respectively, and the included angle between the positioning cutting surface, the first cutting surface and the second cutting surface and the central axis of the drill bit decreases in turn.

2. A diamond micro-bur for ultra-micro machining as claimed in claim 1, wherein: All the positioning cutting edges converge to a point at the center of the end of the drill bit, and all the positioning cutting surfaces combine to form a tool tip.

3. A diamond micro-bur for ultra-micro machining as claimed in claim 2, wherein: The first cutting surface and the second cutting surface are inclined to the side away from the chip flute, forming the relief angle of the first cutting edge and the second cutting edge.

4. A diamond micro-bur for ultra-micro machining as claimed in claim 2, wherein: Each of the chip flutes is provided with a connecting groove on the positioning cutting surface, and each of the connecting grooves is aligned with a positioning cutting edge.

5. A diamond micro-bur for ultra-micro machining as claimed in claim 4, wherein: The core thickness of the drill bit is 25%-35% of the diameter of the drill bit, and the core thickness of the tool tip is 10%-13% of the diameter of the drill bit.

6. A diamond micro-bur for ultra-micro machining as claimed in claim 1, wherein: The chip flute is spiral, there are three chip flutes, and the positioning cutting surface, the first cutting surface and the second cutting surface are all provided with three.

7. A diamond micro-bur for ultra-micro machining as claimed in claim 1, wherein: The drill bit is made of PCD material.

8. A diamond micro-bur for ultra-micro machining as claimed in claim 1, wherein: The included angle between the positioning cutting surface and the central axis of the drill bit is 50°-70°.

9. A diamond micro-bur for ultra-micro machining as claimed in claim 1, wherein: The included angle between the first cutting surface and the central axis of the drill bit is 35°-45°.

10. A diamond micro-bur for ultra-micro machining as claimed in claim 1, wherein: The included angle between the second cutting surface and the central axis of the drill bit is 20°-30°.

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