High-hardness mold steel drill bits

Abstract

This utility model belongs to the field of drill bit technology, specifically relating to a drill bit for high-hardness mold steel. The high-hardness mold steel drill bit of this utility model includes: a blade and a shank; the blade is provided with two spiral grooves extending helically along the drill bit's rotation axis; the spiral angle α of the spiral grooves is 10°~15°; the cutting diameter taper of the blade is 0.1~0.15 / 100. Compared with ordinary high-hardness steel drill bits, the high-hardness mold steel drill bit of this utility model reduces the spiral angle of the spiral grooves, reduces the cutting diameter taper and groove rake angle, and increases the drill bit core thickness. The combination of these parameters allows for an average machining life exceeding 10m in machining holes in mold steel with a hardness of HRC45~60, while maintaining a hole diameter tolerance within ±0.005mm.

Description

Technical Field

[0001] This utility model belongs to the field of drill bit technology, specifically relating to a drill bit for high-hardness mold steel. Background Technology

[0002] Molds are used in various products, such as automobiles, aerospace, electrical and communications equipment, and medical products and equipment. Many products utilize molds for production, and the materials used for molds are mostly high-hardness mold steels (e.g., HRC45-60). Currently, the high-hardness drill bits commonly used in China, compared to ordinary drill bits, only differ in the type of coating, improving the coating's wear resistance, and their service life can barely reach 10m.

[0003] However, in the machining of holes in mold steel, in addition to testing the wear resistance of the drill bit, there are many high-precision requirements that the drilling must meet directly, such as the hole diameter tolerance requirement of ±0.005mm. There are more and more cases where both the service life requirement (10m) and the high precision requirement (hole diameter tolerance requirement of ±0.005mm) must be met, and ordinary high-hardness steel drill bits cannot meet them at the same time. Utility Model Content

[0004] The purpose of this invention is to provide a drill bit for high-hardness mold steel to solve the above-mentioned technical problems.

[0005] This application provides a drill bit for high-hardness mold steel, comprising: a drill body and a drill shank; The cutter body is provided with two spiral grooves that extend spirally along the rotation axis of the drill bit. The helix angle α of the spiral groove is 10° to 15°; The blade diameter taper is 0.1 to 0.15 / 100.

[0006] In one embodiment of this application, the cutting diameter of the blade is D; The core thickness d of the cutter body is 0.35 to 0.4D.

[0007] In one embodiment of this application, the groove front angle β of the spiral groove is 2° to 6°.

[0008] In one embodiment of this application, the front end of the blade is provided with two coolant holes.

[0009] In one embodiment of this application, the helix angle α of the helical groove is 10° to 12°.

[0010] In one embodiment of this application, the groove front angle β of the spiral groove is 2° to 4°.

[0011] The beneficial effects of this utility model are: Unlike existing technologies, this application provides a high-hardness mold steel drill bit, comprising: a blade and a shank; the blade is provided with two spiral grooves extending helically along the drill bit's rotation axis; the spiral angle α of the spiral grooves is 10° to 15°; the cutting diameter taper of the blade is 0.1 to 0.15 / 100. Compared with ordinary high-hardness steel drill bits, this invention reduces the spiral angle of the spiral grooves, reduces the cutting diameter taper and groove rake angle, and increases the drill bit core thickness. The combination of these parameters allows for an average machining life exceeding 10m in machining holes in mold steel with a hardness of HRC45 to 60, while maintaining a hole diameter tolerance of ±0.005mm.

[0012] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.

[0013] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0014] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a front view of a preferred embodiment of the high-hardness mold steel drill bit of this utility model; Figure 2 This is a side view of a high-hardness mold steel drill bit according to a preferred embodiment of the present invention.

[0016] In the picture: 1. Blade body, 11. Coolant hole, 2. Handle, 12. Spiral groove. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] This application provides a drill bit for high-hardness mold steel, which will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0019] See Figure 1 and Figure 2 In one embodiment, the high-hardness mold steel drill bit includes: a blade 1 and a shank 2; the blade 1 is provided with two spiral grooves 12 extending spirally along the drill bit rotation axis; the spiral angle α of the spiral grooves 12 is 10° to 15°; the cutting diameter of the blade 1 is 0.1 to 0.15 / 100.

[0020] In this embodiment, the small helix angle α is equivalent to reducing the axial rake angle of the main cutting edge, with the aim of increasing the wear resistance of the main cutting edge. The small diameter taper can increase the support force of the drill bit in the hole, which is beneficial to achieving hole diameter tolerance control within ±0.005mm.

[0021] Furthermore, the cutting diameter of the blade 1 is D; the core thickness d of the blade 1 is 0.35 to 0.4D.

[0022] In this embodiment, setting a large core thickness can enhance the overall strength of the drill bit, increasing its strength by more than 20% compared to a typical drill bit.

[0023] Furthermore, the groove front angle β of the spiral groove 12 is 2° to 6°.

[0024] In this embodiment, the groove rake angle refers to the angle of concavity within the helical groove. A smaller groove rake angle ensures that the entire cutting edge of the drill tip has no obvious protrusions or concave points, thus eliminating significant stress concentration points and reducing the risk of abnormal wear.

[0025] Optionally, the front end of the cutter body 1 is provided with two coolant holes 11. Cutting fluid can be discharged from the coolant holes 11.

[0026] Preferably, the helix angle α of the helical groove 12 is 10° to 12°.

[0027] Preferably, the groove inlet angle β of the spiral groove 12 is 2° to 4°.

[0028] In summary, the high-hardness mold steel drill bit of this invention has undergone significant structural design modifications compared to ordinary high-hardness steel drill bits. It reduces the helix angle, the reverse taper of the cutting diameter, and the rake angle of the groove, while increasing the core thickness. The combination of these parameters achieves an average machining life of over 10m in the machining of mold steel holes with a hardness of HRC45 to 60, and the hole diameter tolerance is controlled within ±0.005mm.

[0029] It should be noted that all the devices (parts whose specific structures are not specified) selected in this application are general standard parts or parts known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0030] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly, for example, they can be fixed connections, detachable connections, or integral connections.

[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification.

Claims

1. A drill bit for high hardness mold steel, characterized by, include: Blade (1) and handle (2); The blade (1) is provided with two spiral grooves (12) that extend spirally along the rotation axis of the drill bit. The helix angle α of the spiral groove (12) is 10° to 15°; The blade diameter of the blade (1) is tapered to 0.1 to 0.15 / 100.

2. The high-hardness mold steel drill bit according to claim 1, characterized in that, The blade diameter of the blade (1) is D; The core thickness d of the blade (1) is 0.35 to 0.4D.

3. The high-hardness mold steel drill bit according to claim 1, characterized in that, The groove front angle β of the spiral groove (12) is 2° to 6°.

4. The high-hardness mold steel drill bit according to claim 1, characterized in that, The front end of the blade (1) is provided with two coolant holes (11).

5. The high-hardness mold steel drill bit according to claim 1, characterized in that, The helix angle α of the spiral groove (12) is 10° to 12°.

6. The high-hardness mold steel drill bit according to claim 1, characterized in that, The groove front angle β of the spiral groove (12) is 2° to 4°.

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