Symmetrical flat-end hard alloy drilling piece

Abstract

The utility model discloses a hard alloy drill piece with symmetrical flat heads, which relates to the technical field of cutting tools and comprises a drill piece body, a first cutting edge, a second cutting edge, a fourth cutting edge and a fifth cutting edge are respectively arranged on two sides of the drill piece body, the fourth cutting edge and the fifth cutting edge are symmetrical to the first cutting edge and the second cutting edge, and a third cutting edge is connected between the second cutting edge and the fourth cutting edge. A welding face parallel to the third cutting edge is arranged at the lower end of the drill piece body, a straight groove is formed in the middle of the welding face in the direction facing the third cutting edge, and an arc groove is formed in the top of the straight groove in a tangent mode. Different cutting tracks are formed, the drilling efficiency is improved, chip removal and heat dissipation of the drilling piece are facilitated, the service life of the drilling piece is prolonged, during drilling operation, the drilling center is subjected to cross transformation, rapid cutting-in is more facilitated, the punching quality is good, the efficiency is high, grooving is conducted at the bottom, materials are saved, and meanwhile tool bit materials are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of cutting tools, in particular to a symmetrical flat-head hard alloy drill piece. Background Art

[0002] The slotted drill drilling tools currently available on the market are mainly composed of a drill bit and a drill rod fixedly welded to the drill bit. One end of the drill rod is welded to the bottom surface of the drill bit, and the other end of the drill rod is clamped into the fixture of the drilling rig. The drill bit contacts the material to be drilled. Due to the rotation and axial movement of the drill rod, the drill bit can grind the required hole in the material to be drilled.

[0003] In the prior art, most straight-edge drill bits are designed with symmetrical arc cutting edges, and the bottom surface is a plane. As a welding surface, the straight-edge drill bit has only two cutting edges. During use, since the contact point between the drill tip and the material to be punched is one point, when encountering a smooth and hard material surface, it is easy to make the drilling inaccurately centered, or often slip during drilling, which will cause the drill bit and the force point of the material to be punched to slide. This not only increases the difficulty of drilling, resulting in an increase in the scrap rate of the product, but also easily affects the use effect and increases the cost of the product. In addition, the traditional symmetrical arc drill bit cutting edge has little adjustability and a single blade shape. During drilling, it is easy to cause chip removal difficulties, especially when drilling without adding water, which easily causes the alloy temperature to rise and burn the alloy cutter head. Utility Model Content

[0004] The utility model aims to provide a symmetrical flat-head cemented carbide drill bit to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a symmetrical flat-headed carbide drill bit, comprising a drill bit main body, with cutting edge one, cutting edge two, and cutting edge four and cutting edge five symmetrical to the two edges respectively arranged on both sides of the drill bit main body, with cutting edge three connected between the cutting edge two and the cutting edge four, and a welding surface parallel to the cutting edge three being arranged at the lower end of the drill bit main body, a straight groove being opened in the middle of the welding surface toward the cutting edge three, and a circular arc groove being tangent to the top of the straight groove.

[0006] Preferably, the drill bit body is a symmetrical flat head structure.

[0007] Preferably, the cutting edge one, the cutting edge two, the cutting edge four and the cutting edge five are all linear cutting edges.

[0008] Preferably, the arc diameter of the arc groove is 1mm-4.5mm, and the depth of the straight groove is 2mm-6.5mm.

[0009] Preferably, the vertical inclination angle between the cutting edge 2 and the cutting edge 4 is 20°-30°, and the length of the cutting edge 3 is 1mm-4mm.

[0010] Preferably, the drill bit body has a thickness of 0.75 mm to 2.1 mm and a height of 6 mm to 19.6 mm.

[0011] Preferably, the welding surface diameter is 4.4 mm-13.4 mm.

[0012] Compared with the prior art, the utility model has the following beneficial effects: the drill body is designed with a symmetrical flat head structure. Compared with the existing symmetrical drill, it has 5 different cutting edges, and the cutting edges are all straight lines. Unlike the traditional symmetrical drill with arc cutting edges on both sides, the 5 straight cutting edges can be easily adjusted by sharpening, so that the alloy drill forms different cutting trajectories during drilling operations, which not only improves the drilling efficiency, but also facilitates the chip removal and heat dissipation of the drill, and increases the service life of the drill. In addition, during drilling operations, due to the symmetrical flat head design, the drilling center can produce cross-transformation, which is more conducive to rapid cutting than the traditional symmetrical arc drill with single-point centering, and has good drilling quality, high efficiency, bottom slotting, and more material saving, while also saving the cost of the cutter head material. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the front view of the utility model;

[0014] Figure 2 It is a side view of the utility model.

[0015] In the figure:

[0016] 1. Cutting edge one; 2. Cutting edge two; 3. Cutting edge three; 4. Cutting edge four; 5. Cutting edge five; 6. Welding surface; 7. Arc groove. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1-2A symmetrical flat-headed cemented carbide drill bit, comprising a drill bit body, wherein a cutting edge 1, a cutting edge 2, and a cutting edge 4 and a cutting edge 5 symmetrical to the two are respectively arranged on both sides of the drill bit body, a cutting edge 3 3 is connected between the cutting edge 2 2 and the cutting edge 4 4, a welding surface 6 parallel to the cutting edge 3 3 is arranged at the lower end of the drill bit body, a straight groove is opened in the middle of the welding surface 6 toward the cutting edge 3 3, and a circular arc groove 7 is tangent to the top of the straight groove, the drill bit body is a symmetrical flat head structure, the cutting edge 1 1, the cutting edge 2 2, the cutting edge 4 4 ​​and the cutting edge 5 5 are all linear cutting edges, the arc diameter of the circular arc groove 7 is 1mm-4.5mm, the straight groove depth is 2mm-6.5mm, the cutting edge 2 2 and the vertical inclination angle of the cutting edge 4 is 20°-30°, the length of the cutting edge 3 is 1mm-4mm, the thickness of the drill body is 0.75mm-2.1mm, the height is 6mm-19.6mm, the diameter of the welding surface 6 is 4.4mm-13.4mm, and the drill body is a symmetrical flat head structure design. Compared with the existing symmetrical drills, there are 5 different cutting edges, and the cutting edges are all straight lines. Different from the traditional symmetrical drills with arc cutting edges on both sides, the blade shape can be easily adjusted through sharpening through the 5 straight cutting edges, so that the alloy drill forms different cutting trajectories during drilling operations, which not only improves the drilling efficiency, but also facilitates the chip removal and heat dissipation of the drill, and increases the service life of the drill. In addition, during drilling operations, due to the symmetrical flat head design, the drilling center can produce cross transformation, which is more conducive to rapid cutting than the single-point centering of the traditional symmetrical arc drill, and has good drilling quality, high efficiency, bottom slotting, and more material saving, while also saving the cost of the cutter head material.

[0019] In view of the above data, this application lists the following embodiments;

[0020] Example 1: The welding surface 6 is a 6.8 mm hard alloy drill bit, and the specific parameters are as follows:

[0021] (1) The lengths of cutting edge 1 and cutting edge 5 are 4.5 mm, and the length of cutting edge 3 is 2 mm;

[0022] (2) The angle between the cutting edge 2 and the cutting edge 4 and the vertical direction is 22.4°;

[0023] (3) The depth of the straight groove is 3 mm, and the radius of the arc groove 7 is 1.25 mm;

[0024] (4) The total height of the drill body is 10.5 mm and the thickness is 1.55 mm.

[0025] The drill bit is obtained by welding the cemented carbide drill piece of the above-mentioned specification provided in Example 1 of the utility model to a drill base body of matching specification.

[0026] Example 2: The welding surface 6 is a 8.5 mm hard alloy drill bit, and the specific parameters are as follows:

[0027] (1) The lengths of cutting edge 1 and cutting edge 5 are 6.4 mm, and the length of cutting edge 3 is 2.2 mm;

[0028] (2) The angle between the cutting edge 2 and the cutting edge 4 and the vertical direction is 22.5°;

[0029] (3) The depth of the straight groove is 4.5 mm, and the radius of the arc groove 7 is 1.75 mm;

[0030] (4) The total height of the drill body is 14 mm and the thickness is 1.58 mm.

[0031] The drill bit is obtained by welding the cemented carbide drill piece of the above-mentioned specifications provided in Example 2 of the utility model to a drill base body of matching specifications.

[0032] Example 3: The welding surface 6 is a 10.5 mm hard alloy drill bit, and the specific parameters are as follows:

[0033] (1) The lengths of cutting edge 1 and cutting edge 5 are 7.3 mm, and the length of cutting edge 3 is 2.4 mm;

[0034] (2) The angle between the cutting edge 2 and the cutting edge 4 and the vertical direction is 22.6°;

[0035] (3) The depth of the straight groove is 5.5 mm, and the radius of the arc groove 7 is 1.9 mm;

[0036] (4) The total height of the drill body is 17 mm and the thickness is 1.85 mm.

[0037] The drill bit is obtained by welding the cemented carbide drill piece of the above-mentioned specifications provided in Example 3 of the present invention to a drill base body of matching specifications.

[0038] Example 4: The welding surface 6 is a 12.8 mm hard alloy drill bit, and the specific parameters are as follows:

[0039] (1) The lengths of cutting edge 1 and cutting edge 5 are 6.5 mm, and the length of cutting edge 3 is 3.8 mm;

[0040] (2) The angle between the cutting edge 2 and the cutting edge 4 and the vertical direction is 24.8°;

[0041] (3) The depth of the straight groove is 5.5 mm, and the radius of the arc groove 7 is 2 mm;

[0042] (4) The total height of the drill body is 18.5 mm and the thickness is 1.95 mm.

[0043] The drill bit is obtained by welding the cemented carbide drill piece of the above-mentioned specifications provided in Example 4 of the utility model to a drill base body of matching specifications.

[0044] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A symmetrical flat head carbide drill bit, The drill bit body comprises a drill bit main body, wherein cutting edge one, cutting edge two, and cutting edge four and cutting edge five symmetrical to the two are respectively arranged on both sides of the drill bit main body, cutting edge three is connected between cutting edge two and cutting edge four, and a welding surface parallel to cutting edge three is arranged at the lower end of the drill bit main body, a straight groove is opened in the middle part of the welding surface toward the cutting edge three, and a circular arc groove is tangent to the top of the straight groove.

2. The symmetrical flat-head cemented carbide drill bit according to claim 1, characterized in that: The drill bit body is a symmetrical flat head structure.

3. The symmetrical flat-head cemented carbide drill bit according to claim 1, characterized in that: The cutting edge one, the cutting edge two, the cutting edge four and the cutting edge five are all straight-line cutting edges.

4. The symmetrical flat-head cemented carbide drill bit according to claim 1, characterized in that: The arc diameter of the arc groove is 1mm-4.5mm, and the depth of the straight groove is 2mm-6.5mm.

5. The symmetrical flat-head cemented carbide drill bit according to claim 1, characterized in that: The vertical inclination angles of the cutting edge 2 and the cutting edge 4 are 20°-30°, and the length of the cutting edge 3 is 1mm-4mm.

6. The symmetrical flat-head cemented carbide drill bit according to claim 1, characterized in that: The drill piece body has a thickness of 0.75 mm to 2.1 mm and a height of 6 mm to 19.6 mm.

7. The symmetrical flat-head cemented carbide drill bit according to claim 1, characterized in that: The diameter of the welding surface is 4.4 mm-13.4 mm.

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