Micropore drill bit

Abstract

The utility model discloses a micropore drill bit, which relates to the technical field of micropore drill bits and comprises a drill bit body, the drill bit body comprises a cutting part, one end of the cutting part is connected with a drill tip part, the other end of the cutting part is connected with a cutter handle part, the cutting part is arranged in a single ligament mode, and the drill tip part is arranged in a four-small-plane drill tip mode. The four-small-plane drill tip comprises two oppositely-arranged conical plane structures and two oppositely-arranged slope face structures. The drill tip part is provided with four small plane drill tips, the drill tip part is provided with two slope surface structures, the side surfaces of the two slope surface structures are respectively provided with a plane transition edge, each plane transition edge comprises a transition sharp corner which is arranged by bending the slope surface structure, and the transition sharp corner and the center of the drill tip part are connected with a short chisel edge. And smooth and continuous gradual change of main cutting force is ensured, stress concentration points are reduced, uniform abrasion loss is obtained, and the service life of the drill bit is prolonged.

Description

Technical Field

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

[0002] A micro-drill is a tool used to create tiny holes or vias, typically used in applications such as micromachining, microfabrication, micro-drilling and micro-hole machining. These micro-holes typically have sub-millimeter or micron diameters, and therefore require highly precise tools to create.

[0003] Micro-hole drill bits usually have the following features:

[0004] Extremely small diameter: The diameter of a micro-drill is usually very small, often ranging from a few microns to tens of microns, so it can be used to process very small holes.

[0005] High precision: Micro-hole drills need to have extremely high precision to ensure that the size of the processed holes is accurate.

[0006] Manufacturing materials: Micro-hole drill bits are usually made of hard materials such as tungsten steel, carbide, ceramics, etc. to ensure that they have sufficient wear resistance and rigidity.

[0007] Cooling and lubrication: In micro-hole processing, coolant or lubricant is usually required to prevent the drill from overheating and help remove cutting waste.

[0008] Micro-hole drills are often used in the fields of microelectronics manufacturing, micro-mechanical manufacturing, biomedical device manufacturing, etc. They have a wide range of applications and can be used to make micro sensors, micro fluid channels, micro circuit boards and other micro-scale components and structures. These micro-hole drills play an important role in modern science and technology and industry, helping to realize many micro- and nano-level engineering and scientific applications.

[0009] At present, the sharp angle of a single-ligament micro-hole drill generally refers only to the angle of the tip of the drill bit at the cutting edge. The performance and processing results of the cutting process are controlled by the cutting angle of the edge. When in use, there are fewer stress concentration points in the cutting part, and only cutting is performed on both sides, which can easily lead to large wear and reduced service life.

[0010] As mentioned above, we have designed a micro-hole drill to solve the above problems. Summary of the invention

[0011] The utility model aims to solve the shortcomings in the prior art and provides a micro-hole drill.

[0012] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0013] A micro-hole drill bit, comprising a drill bit body, wherein the drill bit body comprises:

[0014] A cutting portion, one end of the cutting portion is connected to the drill tip portion, and the other end of the cutting portion is connected to the shank portion, the cutting portion is a single ligament setting, the drill tip portion is a four-small plane drill tip setting, the four-small plane drill tip includes two oppositely arranged conical plane structures and two oppositely arranged slope surface structures; the sides of the two slope surface structures are provided with a plane transition edge, the plane transition edge includes a slope surface structure bent and provided with a transition angle, the transition angle is connected to the center of the drill tip portion with a short transverse edge; the drill body also includes: a core portion, the front side of the core portion is an inverted cone structure, the rear side of the core portion is a cylindrical structure, the rear end of the inverted cone structure is connected to the cylindrical structure, the front end of the core portion has a core thickness diameter of 0.28D, and the rear end has a core thickness diameter of 0.26D.

[0015] Preferably, there are two transition sharp angles, and the angle range of the transition sharp angles is 13 to 25.

[0016] Preferably, the transition angle is arranged on the middle side of the slope surface structure.

[0017] Preferably, the turning angle of the connection between the inverted cone structure and the cylindrical structure ranges from 55 to 60 degrees.

[0018] Preferably, the cross-sectional diameter length of the shank portion is greater than the cross-sectional diameter length of the cutting portion.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] 1. By designing the drill tip with four small planes and adding plane transition edges on the sides of two of the planes, the transition sharp angle between the main cutting edge and the feed angle is eliminated: ensuring the smooth and continuous gradual change of the main cutting force, reducing stress concentration points, obtaining uniform wear, and extending the life of the drill bit.

[0021] 2. The core thickness of the drill core is designed to be inverted cone + cylindrical: when drilling and removing chips, the tool rigidity and chip removal space can be perfectly balanced. The chip removal space is getting larger and larger as the chips generated by the head move backward. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural schematic diagram of a micro-hole drill bit proposed by the utility model;

[0023] Figure 2 A front view of a drill tip of a micro-hole drill bit proposed by the utility model;

[0024] Figure 3 The utility model is a cross-sectional view of the drilling core portion of a micro-hole drill bit.

[0025] In the figure: 1. conical plane structure, 2. plane transition edge, 3. single ligament, 4. drill core, 5. short transverse edge, 6. cutting part, 7. shank part, 8. drill tip part; 9. slope surface structure. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects of the utility model easy to understand, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments.

[0027] Embodiment 1

[0028] In this embodiment, refer to Figure 1-3 A micro-hole drill bit includes a drill body, which includes a cutting part 6, one end of the cutting part 6 is connected to a drill tip part 8, and the other end of the cutting part 7 is connected to a shank part 7. The cutting part 7 is provided with a single ligament 3. The single ligament design can reduce friction during processing and improve tool life.

[0029] More specifically, the drill tip 8 is configured with four small planes, which makes cutting easier during use: a straight cutting edge, easy cutting, and good centering. At the same time, the four small planes design can enhance the stability of the drill core during operation, and the drilling position will not deviate; the four small planes drill tip includes two relatively arranged conical plane structures 1 and two relatively arranged slope surface structures 9; wherein, a coating is applied to the outer side of the small plane drill tip to enhance its wear resistance and cutting performance; the coating can be a paint or film coated on the surface of the drill tip.

[0030] In this embodiment, the sides of the two ramp surface structures 9 are provided with a plane transition blade 2, and the plane transition blade 2 includes a transition sharp angle provided at the bend of the ramp surface structure 9, and the transition sharp angle is provided on the middle side of the ramp surface structure 8, and the transition sharp angle is connected to the center of the drill tip 8 by a short transverse blade 5. In the prior art, the sharp angle of a single-ligament micro-hole drill generally refers only to the angle of the tip of the drill at the cutting edge of the drill. When in use, there are fewer stress concentration points in the cutting part, and only cutting by force on both sides can easily cause a large amount of wear. The utility model designs the drill tip of the drill tip with four small planes, and adds plane transition blades on the sides of two of the planes, thereby eliminating the transition sharp angle between the main cutting edge and the feed angle: ensuring a smooth and continuous gradual change of the main cutting force, reducing stress concentration points, obtaining uniform wear, and improving the life of the drill.

[0031] In this embodiment, the drill body also includes: a core drill portion 4, the front side of the core drill portion 4 is an inverted cone structure, the rear side of the core drill portion 4 is a cylindrical structure, and the rear end of the inverted cone structure is connected to the cylindrical structure. When in use, the core thickness of the core drill portion 4 is designed to be an inverted cone + cylindrical core thickness: when drilling and removing chips, the tool rigidity and chip removal space can be maximized and perfectly balanced. The iron chips generated by the head move backward to obtain a larger and larger chip removal space. More specifically, there are two transition sharp angles, and the angle range of the transition sharp angle is, the turning angle range at the connection between the inverted cone structure and the cylindrical structure is, and the cross-sectional diameter length of the shank portion 7 is greater than the cross-sectional diameter length of the cutting portion 7.

[0032] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The basic principles, main features and advantages of the present utility model are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and that various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and that these changes and improvements fall within the scope of protection claimed by the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A micro-hole drill bit, comprising a drill bit body, wherein the drill bit body comprises: A cutting portion (6), one end of the cutting portion (6) is connected to a drill tip portion (8), and the other end of the cutting portion (6) is connected to a shank portion (7). The cutting portion (6) is a single ligament (3) arrangement, characterized in that the drill tip portion (8) is a four-plane drill tip arrangement, and the four-plane drill tip comprises two oppositely arranged conical plane structures (1) and two oppositely arranged slope surface structures (9); the sides of the two slope surface structures (9) are both provided with a plane transition blade (2), and the plane transition blade (2) comprises a slope surface structure (9) bent and provided with a transition sharp angle, and the transition sharp angle is connected to the center of the drill tip portion (8) with a short transverse blade (5); the drill body also comprises: a drill core portion (4), the front side of the drill core portion (4) is an inverted cone structure, and the rear side of the drill core portion (4) is a cylindrical structure, and the rear end of the inverted cone structure is connected to the cylindrical structure, and the front end of the drill core portion (4) has a core thickness diameter of 0.28D, and the rear end has a core thickness diameter of 0.26D.

2. A micro-hole drill according to claim 1, characterized in that: There are two transition sharp angles, and the angle range of the transition sharp angles is 13 to 25 degrees.

3. A micro-hole drill according to claim 1, characterized in that: The transition sharp corner is arranged on the middle side of the slope surface structure (9).

4. A micro-hole drill according to claim 1, characterized in that: The turning angle of the connection between the inverted cone structure and the cylindrical structure ranges from 55 to 60 degrees.

5. The micro-hole drill bit according to claim 1, characterized in that: The cross-sectional diameter length of the shank portion (7) is greater than the cross-sectional diameter length of the cutting portion (6).

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