Twist drill with saw teeth on drill tip

Abstract

The utility model relates to the technical field of twist drills, in particular to a twist drill with sawteeth on a drill tip, which comprises a handle portion, a neck portion and a working portion, double spiral grooves are arranged on the neck portion and the working portion, a chisel edge is arranged at the center of one end of the working portion far away from the neck portion, rear cutter faces are arranged on two sides of the chisel edge, and a plurality of sawteeth are arranged on the two rear cutter faces. Compared with an existing twist drill with a linear cutting edge, the twist drill is reasonable in structure, the saw teeth with different numbers are arranged on the two rear tool faces of the working part, the cutting edge is not prone to abrasion and small in stress, the chip removal effect is better when viscous materials are cut, the situation that scrap iron adheres to a drill bit is not prone to occurring, and therefore the heat dissipation effect and the abrasion resistance can be effectively guaranteed, and the service life of the twist drill is prolonged. And the working efficiency is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of twist drills, in particular to a twist drill with saw teeth on the drill tip. Background Art

[0002] When drilling, a twist drill with a conventional structure uses two symmetrically distributed straight cutting edges to simultaneously complete the metal cutting amount of corresponding size, which makes the power required for drilling relatively large. At the same time, the reaction force on the two cutting edges is also very large, that is, the resistance is large, which causes the cutting edges to heat up quickly and are easily damaged, thus affecting the service life. Moreover, when cutting sticky materials, the chip removal effect is poor, which easily causes iron chips to stick to the drill bit, affecting the heat dissipation effect and wear resistance. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the defects of the above-mentioned technology and provide a twist drill with saw teeth at the drill tip.

[0004] A twist drill with saw teeth at the drill tip comprises a shank, a neck and a working part, wherein the neck and the working part are provided with double spiral grooves, a chisel edge is provided at the center of one end of the working part away from the neck, and flank surfaces are provided on both sides of the chisel edge, and a plurality of saw teeth are provided on the two flank surfaces.

[0005] Furthermore, the numbers of serrations on the two flank surfaces are different, one flank surface has an odd number of serrations, and the other flank surface has an even number of serrations.

[0006] Furthermore, the cross-sectional shape of the sawtooth is a V-shaped groove shape, wherein a single sawtooth is arranged on one rear blade surface, and a double sawtooth is arranged on the other rear blade surface.

[0007] Furthermore, the diameter of the twist drill is in the range of 3-21 mm, and the number of teeth on the back face is 3-7.

[0008] Furthermore, the plurality of serrations on each of the flank surfaces are arranged parallel to each other.

[0009] The utility model has the advantages of reasonable structure, and different numbers of serrations are arranged on the two rear blade surfaces of the working part. Compared with the existing straight-shaped cutting edge twist drill, the cutting edge is not easy to wear and the stress is small. Moreover, the chip removal effect is better when cutting sticky materials, and it is not easy for iron chips to stick to the drill bit, thereby effectively ensuring the heat dissipation effect and wear resistance, and effectively improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The utility model is a schematic diagram of a twist drill with saw teeth on the drill tip.

[0011] As shown in the figure: 1. Shank; 2. Neck; 3. Working part; 4. Double spiral groove; 5. Chisel edge; 6. Back blade; 7. Serration. DETAILED DESCRIPTION

[0012] In the description of the present invention, 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 orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0013] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. 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 "plurality" is two or more, unless otherwise clearly and specifically defined.

[0014] In the description of the embodiments of the present utility model, if a feature is referred to as being "set", "fixed", "connected" or "installed" on another feature, it may be directly set, fixed, connected to another feature, or indirectly set, fixed, connected, or installed on another feature.

[0015] In the description of the embodiments of the present utility model, if "several" is involved, it means more than one, if "multiple" is involved, it means more than two, if "greater than", "less than" or "exceed" is involved, it should be understood as not including the number itself, if "above", "below" or "within" is involved, it should be understood as including the number itself. If "first" or "second" is involved, it should be understood as being used to distinguish technical features, and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0016] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0017] Example

[0018] like Figure 1As shown, a twist drill with serrations on the drill tip comprises a shank 1, a neck 2 and a working part 3, wherein the neck 2 and the working part 3 are provided with double spiral grooves 4, a chisel edge 5 is provided at the center of one end of the working part 3 away from the neck 2, and flank surfaces 6 are provided on both sides of the chisel edge, and a plurality of serrations 7 are provided on the two flank surfaces 6.

[0019] In the embodiment, the cross-sectional shape of the serration 7 is a V-shaped groove shape, and the number of serrations 7 on the two rear blade surfaces 6 is different, the number of serrations 7 on one rear blade surface 6 is an odd number, and the number of serrations 7 on the other rear blade surface 6 is an even number. For example, one of the rear blade surfaces 6 is provided with a single serration, and the other rear blade surface 6 is provided with a double serration, thereby reducing chip removal resistance and making chip removal smoother.

[0020] In the embodiment, the diameter of the twist drill is in the range of 3-21 mm, and the number of teeth on the back cutting surface 6 is 3-7.

[0021] In the embodiment, the plurality of saw teeth 7 on each of the rear cutting surfaces 6 are arranged parallel to each other, or the size of the front end of each saw tooth 7 is larger than that of the rear end along the rotation direction, and the saw teeth 7 gradually decrease in a cone shape.

[0022] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0023] The above description of the utility model and its implementation methods is not restrictive. The drawings show only one implementation method of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention of the utility model, they should all fall within the protection scope of the utility model.

Claims

1. A twist drill with saw teeth at the drill tip, comprising a shank (1), a neck (2) and a working portion (3), wherein the neck (2) and the working portion (3) are provided with double spiral grooves (4), characterized in that: A chisel edge (5) is provided at the center of one end of the working portion (3) away from the neck (2), and flank surfaces (6) are provided on both sides of the chisel edge. A plurality of saw teeth (7) are provided on the two flank surfaces (6).

2. A twist drill with sawtooth at the drill tip according to claim 1, characterized in that: The numbers of saw teeth (7) on the two rear blade surfaces (6) are different, the number of saw teeth (7) on one rear blade surface (6) is an odd number, and the number of saw teeth (7) on the other rear blade surface (6) is an even number.

3. A twist drill with saw teeth at the drill tip according to claim 2, characterized in that: The cross-sectional shape of the saw teeth (7) is a V-shaped groove shape, one rear blade surface (6) is provided with a single saw tooth, and the other rear blade surface (6) is provided with a double saw tooth.

4. A twist drill with saw teeth at the drill tip according to claim 1, characterized in that: The diameter of the twist drill is in the range of 3-21 mm, and the number of teeth on the back face (6) is 3-7.

5. The twist drill with sawtooth on the drill tip according to claim 2, characterized in that: The plurality of saw teeth (7) on each rear cutting surface (6) are arranged parallel to each other.

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