Anti-skew self-correcting spiral flute stepped drill

Abstract

The utility model provides a kind of anti-inclination self-correcting spiral groove stepped drill, it is related to cutting tool technical field, the utility model is provided with annular guide blade by being arranged at drill bit front end, increase the cutting force of material quality at drill bit step, the direction orientation when neat drill bit is drilled is simultaneously guided, the inclination tendency of drill bit is reduced;Metal correction block is increased at drill bit bottom, spring is provided on metal correction block, so that drill bit has self-correcting ability, ensure the stability and reliability of drilling process.

Description

Technical Field

[0001] This utility model relates to the field of cutting tool technology, specifically to an anti-skew self-correcting spiral groove stepped drill. Background Technology

[0002] A step drill is a high-efficiency tool used for machining stepped holes of different diameters, widely used in drilling metals, wood, and other materials. However, traditional step drills often experience drill bit skew during drilling due to uneven cutting resistance distribution and the feed direction being easily affected by material hardness differences. This leads to reduced hole diameter accuracy, increased hole wall roughness, and even tool breakage. Furthermore, the spiral flute design of traditional tools is often based on empirical parameters and does not fully consider the low-resistance mechanism during cutting, resulting in high cutting power consumption and low operating efficiency.

[0003] To address the aforementioned issues, existing technologies have attempted improvements such as optimizing the helix angle and adding guiding mechanisms, but have not systematically studied the low-resistance coupling mechanism of the cutting organ from a biomimetic perspective. A common approach is to reduce skewing by placing guide posts at the drill bit's tip; however, the friction between the guide posts and the hole wall actually increases cutting resistance, failing to achieve a synergistic optimization of low power consumption and anti-skewing.

[0004] To address the shortcomings of existing stepped drills, such as easy skewness and high cutting resistance, this invention provides a self-correcting spiral groove stepped drill that prevents skewness. Through biomimetic coupling design, the stepped guiding mechanism and self-correcting mechanism are optimized to achieve a synergistic improvement in low-resistance cutting and self-correcting functions. Utility Model Content

[0005] To improve the anti-skewness capability of stepped drills, this utility model provides the following technical solution:

[0006] A self-correcting spiral groove stepped drill for preventing skewness includes a drill bit body, which consists of a shank and a working part. The working part has multiple steps along the axial direction, and an annular guide blade is provided at the transition of the steps. The front face of the guide blade is provided with a serrated cutting edge, and three spiral grooves are provided on the outer circumference. The shank is provided with a fixing hole, and a metal correction block is provided on the hole.

[0007] Preferably, the width of the serrated blade of the guide blade is 0.5 mm.

[0008] Preferably, the metal straightening block consists of a connecting block and a fixing bolt. The fixing bolt is detachably connected to the connecting block through a pin hole on the connecting block, and a spring is also provided on the fixing bolt.

[0009] Preferably, the metal straightening block is detachably connected to the drill bit body through a fixing hole.

[0010] Preferably, the three spiral grooves are equidistantly distributed, with a lead of 1.2 times the drill bit diameter and a groove depth of 1 / 10 of the diameter.

[0011] Preferably, the drill bit body is made of high-speed steel W6Mo5Cr4V2 with a TiAlN coating.

[0012] The beneficial effects of this utility model are as follows: By setting an annular guide blade at the front end of the drill bit, the cutting force on the material at the drill bit step is increased, and the direction of the drill bit during drilling is guided, reducing the tendency of the drill bit to skew. A metal straightening block with a spring is added to the bottom of the drill bit, giving the drill bit self-correcting capability and ensuring the stability and reliability of the drilling process. The drill bit body is made of high-speed steel W6Mo5Cr4V2 with a TiAlN coating, which not only improves the wear resistance and service life of the tool but also further reduces frictional resistance during cutting. Through multifaceted technological innovation and optimized design, a synergistic improvement in low-resistance cutting and self-correcting function is achieved, significantly improving the accuracy and efficiency of drilling operations. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained through these drawings without creative effort.

[0014] Figure 1 This is a structural diagram of the present utility model;

[0015] Figure 2 This is a schematic diagram of the annular guide blade structure;

[0016] Figure 3 This is a schematic diagram of the metal straightening block structure;

[0017] In the diagram: 1 - Working part; 2 - Handle; 3 - Step; 4 - Spiral groove; 5 - Fixing hole; 6 - Annular guide blade; 7 - Connecting block; 8 - Fixing bolt; 9 - Spring. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," 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. They 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" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] Example:

[0021] like Figure 1-3 A self-correcting spiral groove 4-step drill bit with anti-skewness includes a drill bit body, which consists of a shank 2 and a working part 1. The working part 1 of the step drill bit is arranged in a stepped shape, with multiple steps 3 along the axial direction. An annular guide blade 6 is provided at the transition of the steps 3. The front face of the guide blade is provided with a serrated cutting edge with a width of 0.5mm. Its guiding mechanism is optimized through biomimetic coupling design. The serrated cutting edge can assist the side of the step drill bit in cutting the material surface when the drill bit is cutting, reducing the lateral pressure generated during cutting and reducing the skewness problem when drilling. Three spiral grooves 4 are provided on the outer circumference to allow space for the debris generated during cutting to fly out. The shank 2 is provided with a fixing hole 5, and a metal correction block is provided on the hole. The metal correction block is detachably connected to the drill bit body through the fixing hole 5.

[0022] Meanwhile, the drill bit body features three equally spaced spiral grooves with a lead 1.2 times the drill bit diameter and a groove depth 1 / 10 of the diameter, ensuring smooth chip removal. The drill bit body is made of high-speed steel W6Mo5Cr4V2 with a TiAlN coating, which not only guarantees the tool's wear resistance and service life but also further reduces frictional resistance during cutting.

[0023] The metal straightening block consists of a connecting block 7 and a fixing bolt 8. The fixing bolt 8 is detachably connected to the connecting block 7 through a pin hole on the connecting block 7, and a spring 9 is also provided on the fixing bolt 8. In use, the tail of the metal straightening block is installed through the fixing hole 5 of the drill bit shank 2; the fixing bolt 8 passes through the spring 9 and is inserted into the pin hole to combine with the connecting block 7, and the spring force of the spring 9 abuts against the inner wall of the drill bit connection position; when the drill bit is subjected to lateral force and deflects left or right during drilling operations, the spring force of the spring 9 will automatically correct the direction of the drill bit, ensuring the stability of the drilling process.

[0024] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A self-correcting spiral groove stepped drill for preventing skew, comprising a drill bit body, wherein the drill bit body is composed of a shank and a working part, characterized in that: The working part is provided with multiple steps along the axial direction, and an annular guide blade is provided at the transition of the steps. The front face of the guide blade is provided with a serrated cutting edge, and three spiral grooves are provided on the outer circumference. The shank is provided with a fixing hole, and a metal straightening block is provided on the hole.

2. The anti-skew self-correcting spiral groove stepped drill according to claim 1, characterized in that: The width of the serrated blade of the guide edge is 0.5 mm.

3. The anti-skew self-correcting spiral groove stepped drill according to claim 1, characterized in that: The metal straightening block consists of a connecting block and a fixing bolt. The fixing bolt is detachably connected to the connecting block through a pin hole on the connecting block, and a spring is also provided on the fixing bolt.

4. The anti-skew self-correcting spiral groove stepped drill according to claim 1, characterized in that: The metal straightening block is detachably connected to the drill bit body through a fixing hole.

5. The anti-skew self-correcting spiral groove stepped drill according to claim 1, characterized in that: The three spiral grooves are evenly distributed, with a lead of 1.2 times the drill bit diameter and a groove depth of 1 / 10 of the diameter.

6. The anti-skew self-correcting spiral groove stepped drill according to claim 1, characterized in that: The drill bit body is made of high-speed steel W6Mo5Cr4V2, and the surface is treated with TiAlN coating.

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