Hole opener

Abstract

The utility model relates to the technical field of cutting tools, in particular to a tapper, the tapper comprises a metal matrix and a diamond coating layer, the metal matrix comprises a cylindrical cover body, a connecting body and a connecting shaft, the cylindrical cover body comprises a shell at the upper end and a cutting part at the lower end, a scrap outlet is formed in the shell, and the connecting body is connected with the cutting part. The cutting part is in a sharp tooth shape, the sharp tooth shape is sharper, the cutting effect can be enhanced, the cutting part comprises a set of high sharp teeth and a set of low sharp teeth, and the high sharp teeth are higher than the low sharp teeth. The tapper has the advantages that the tapper has two efficient cutting periods, and the problem that the cutting capacity of the tapper becomes weaker and weaker is solved.

Description

Technical Field

[0001] The present application relates to the technical field of cutting tools, and in particular to a hole opener. Background Art

[0002] Diamond is one of the hardest materials on earth, with a hardness rating of 10, which is much higher than other common abrasives such as silicon carbide or aluminum oxide. This allows diamond hole openers to easily open holes in a variety of hard materials. They are often used to open holes in materials such as glass, ceramics, rock and concrete.

[0003] The structure of the existing diamond hole opener includes a metal substrate and a diamond coating. The metal substrate includes a cylindrical cover and a connecting shaft. The cylindrical cover includes a shell at the upper end and a cutting part at the lower end. The shell is provided with a chip outlet. The cutting part at the lower end has various shapes, including a flat bottom and a sharp tooth shape. The diamond coating is formed by coating the cutting part of the metal substrate with diamond particles through electroplating or brazing processes. The diamond particles are evenly coated on the surface of the metal substrate through the "adhesion" effect of the transition layer. About half of the volume of the diamond particles will be exposed outside the transition layer, which is used to contact the material to realize hole opening.

[0004] In the case of the same service life, the sharp-toothed hole opener has more advantages than the flat-bottomed hole opener. The sharp teeth of the metal matrix also have a certain cutting ability on the material. The tip will wear and consume with use, and the diamond particles coated on the side of the sharp teeth can gradually contact with the material for cutting, improving the cutting effect in the later stage of use. However, in the process of the metal matrix being worn, the tip of the sharp teeth is gradually worn flat and loses its cutting effect, which still causes the cutting ability of the hole opener to become weaker and weaker. Utility Model Content

[0005] In order to improve the problem of the increasingly weak cutting ability of the hole opener, the purpose of the present application is to provide a hole opener.

[0006] The hole opener provided in this application adopts the following technical solution:

[0007] A hole opener includes a metal substrate and a diamond coating. The metal substrate includes a cylindrical cover and a connecting shaft. The cylindrical cover includes a shell at an upper end and a cutting portion at a lower end. The shell is provided with a chip discharge opening. The cutting portion is in the shape of sharp teeth and includes a group of high-pointed teeth and a group of low-pointed teeth. The height of the high-pointed teeth is higher than that of the low-pointed teeth.

[0008] By adopting the above technical solution, the cutting part includes a group of high-pointed teeth and a group of low-pointed teeth, and the height of the high-pointed teeth is higher than that of the low-pointed teeth. When the hole opener is used for work, the material will first contact the diamond particles exposed on the outside. When the part of the diamond particles exposed on the outside is ground flat, the two groups of sharp teeth of different heights in the cutting part will contact the material respectively, thereby enhancing the cutting effect of the hole opener.

[0009] Optionally, the cutting portion is provided with a diamond coating.

[0010] By adopting the above technical solution, the cutting part is coated with diamond particles. When the hole opener is working, the coated diamond particles are the first to contact the material. When the diamond particles are ground flat, the sharp teeth will participate in the cutting of the material. The diamond particles coated on the cutting part enhance the cutting effect of the hole opener.

[0011] Optionally, the high-pointed teeth and the low-pointed teeth are arranged in a V-shape and distributed along the circumference.

[0012] By adopting the above technical solution, the V-shaped pointed teeth are sharper and have a better cutting effect. The high-pointed teeth and the low-pointed teeth are distributed along the circumference to enhance the cutting effect.

[0013] Optionally, the high-pointed teeth are discontinuous with each other, and there is a blank section or a low-pointed tooth between two adjacent high-pointed teeth.

[0014] By adopting the above technical scheme, there is a space between two adjacent high-pointed teeth, and the space between the two high-pointed teeth increases the space for chip removal. There is a low-pointed tooth between two adjacent high-pointed teeth, and the high-pointed teeth and the low-pointed teeth are arranged alternately. Since the heights of the high-pointed teeth and the low-pointed teeth are different, the contact order between the high-pointed teeth and the low-pointed teeth and the material is also different. The material will first contact the high-pointed teeth, and will only contact the low-pointed teeth after the high-pointed teeth fail, thereby enabling the hole opener to have two stages of efficient cutting.

[0015] Optionally, the high-pointed teeth and the low-pointed teeth are similar triangles.

[0016] By adopting the above technical solution, the high-pointed teeth are proportionally enlarged in size compared to the low-pointed teeth, so they are higher in height. A height difference is formed between the high-pointed teeth and the low-pointed teeth, so that the hole opener has two stages of efficient cutting.

[0017] Optionally, among the high-pointed teeth and the low-pointed teeth, two adjacent high-pointed teeth are continuously connected, and the low-pointed teeth are arranged between two adjacent continuously connected high-pointed teeth.

[0018] By adopting the above technical solution, the hole opener configured in this way has stronger strength and generates less vibration when in use.

[0019] Optionally, the chip outlet is a waist-shaped structure, and the chip outlet is longitudinally distributed on the shell.

[0020] By adopting the above technical solution, the chip outlet is a waist-shaped structure. Firstly, the waist-shaped structure has a large longitudinal coverage area, which is suitable for large-scale delivery of coolant and provides a high liquid inlet speed. On the other hand, the chip outlet serves as a channel for the discharge of cutting debris, thereby avoiding friction and aggravated wear caused by debris particles.

[0021] Optionally, the connecting shaft, the connecting body and the cylindrical cover body are an integral structure.

[0022] By adopting the above technical solution, the connecting shaft and the cylindrical cover body are connected as one piece, so that the connection strength between the connecting shaft and the cylindrical cover body is high and not easy to be damaged.

[0023] Optionally, the connecting shaft has a plurality of anti-slip edges.

[0024] By adopting the above technical solution, the anti-skid edge of the connecting shaft has an anti-skid effect.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. Make the hole opener have two efficient cutting stages;

[0027] 2. Improve the problem of the increasingly weak cutting ability of the hole opener;

[0028] 3. Enhance the cutting strength of the hole opener;

[0029] 4. Reduce the vibration intensity generated when the hole opener is used. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application;

[0031] Figure 2 yes Figure 1 The enlarged schematic diagram of point A in the middle;

[0032] Figure 3 It is a schematic diagram of the overall structure of Example 2 of the present application;

[0033] Figure 4 yes Figure 3 The enlarged schematic diagram of point B in the middle;

[0034] In the figure, 1. anti-slip edge; 2. connecting shaft; 3. connecting body; 4. cylindrical cover; 5. chip outlet; 6. cutting part; 7. high-pointed teeth; 8. low-pointed teeth; 9. metal matrix; 10. diamond coating layer; 11. shell. DETAILED DESCRIPTION

[0035] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0036] Embodiment 1: A hole opener comprises a metal substrate 9 and a diamond coating 10, wherein the metal substrate 9 comprises a cylindrical cover body 4, a connector 3 and a connecting shaft 2, wherein the cylindrical cover body 4 comprises a shell 11 at an upper end and a cutting portion 6 at a lower end, wherein the shell 11 is provided with a chip discharge port 5, and the cutting portion 6 is in the shape of sharp teeth, wherein the cutting portion 6 comprises a group of high sharp teeth 7 and a group of low sharp teeth 8, wherein the height of the high sharp teeth 7 is higher than the height of the low sharp teeth 8.

[0037] Reference Figure 1 The connecting shaft 2 has a plurality of anti-skid edges 1, which have an anti-skid effect. A connecting body 3 is connected below the connecting shaft 2, and the connecting body 3 is connected to the cylindrical cover 4. The connecting shaft 2, the connecting body 3 and the cylindrical cover 4 are connected as a whole, and the connection strength is high and not easy to be damaged. The high-pointed teeth 7 and the low-pointed teeth 8 of the cutting part 6 are both V-shaped and distributed along the circumference.

[0038] Reference Figure 2 , the size and shape of any high-pointed teeth 7 in the figure are the same, the adjacent two high-pointed teeth 7 are discontinuous, and a low-pointed tooth 8 with a lower height is inserted between the two adjacent discontinuous high-pointed teeth 7, and the final arrangement is Figure 2 In addition, the high-pointed teeth 7 and the low-pointed teeth 8 shown in the figure are similar triangles.

[0039] When in use, the diamond particles on the surface of the high-pointed teeth 7 contact and cut the material first. As the high-pointed teeth 7 are gradually ground flat, the cutting effect gradually weakens; until the height of the high-pointed teeth 7 after being ground flat reaches the height of the tips of the low-pointed teeth 8, the diamond particles on the tops of the low-pointed teeth 8 begin to contact the material and participate in the cutting of the material, thereby re-enhancing the cutting effect of the hole opener.

[0040] Example 2: Reference Figure 3 Different from the embodiment 1, in this embodiment, the high-pointed teeth and the low-pointed teeth of the cutting part 6 are arranged in another way.

[0041] Reference Figure 4 The high-pointed teeth 7 in the cutting part 6 have the same size and shape, two adjacent high-pointed teeth 7 are continuously connected, and the low-pointed teeth 8 are arranged between two adjacent continuously connected high-pointed teeth 7. The hole opener arranged in this way has stronger strength and generates less vibration when in use.

[0042] The principles and methods of use of Example 1 and Example 2 are consistent. The two embodiments use a group of high-pointed teeth 7 and a group of low-pointed teeth 8. The two groups of pointed teeth work in sections, so that the hole opener has two stages of high-efficiency cutting periods, which improves the problem of the continuous weakening of the cutting effect of the hole opener and enhances the cutting strength of the hole opener.

[0043] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second", "third" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and similar words do not indicate a quantitative limit, but indicate that there is at least one. "Include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0044] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A hole opener, comprising a metal substrate (9) and a diamond coating (10), wherein the metal substrate (9) comprises a cylindrical cover (4), a connecting shaft (2) and a connecting body (3), wherein the cylindrical cover (4) comprises a shell (11) at an upper end and a cutting portion (6) at a lower end, wherein a chip discharge opening (5) is formed on the shell (11), and the cutting portion (6) is in the shape of sharp teeth, characterized in that: The cutting portion (6) comprises a group of high-pointed teeth (7) and a group of low-pointed teeth (8), wherein the height of the high-pointed teeth (7) is higher than the height of the low-pointed teeth (8).

2. The hole opener according to claim 1, characterized in that: The diamond coating layer (10) covers the outer surface of the cutting portion (6).

3. The hole opener according to claim 1, characterized in that: The high-pointed teeth (7) and the low-pointed teeth (8) are arranged in a V-shape and distributed along the circumference.

4. The hole opener according to claim 3, characterized in that: The high-pointed teeth (7) are discontinuous with each other, and a gap or a low-pointed tooth (8) is provided between two adjacent high-pointed teeth (7).

5. The hole opener according to claim 1, characterized in that: The high-pointed teeth (7) and the low-pointed teeth (8) are similar triangles.

6. The hole opener according to claim 1, characterized in that: Among the high-pointed teeth (7) and the low-pointed teeth (8), two adjacent high-pointed teeth (7) are continuously connected, and the low-pointed teeth (8) are arranged between two adjacent continuously connected high-pointed teeth (7).

7. The hole opener according to claim 1, characterized in that: The chip outlet (5) is a waist-shaped structure, and the chip outlet (5) is longitudinally distributed on the housing (11).

8. The hole opener according to claim 1, characterized in that: The connecting shaft (2), the connecting body (3) and the cylindrical cover body (4) are an integral structure.

9. The hole opener according to claim 8, characterized in that: The connecting shaft (2) has a plurality of anti-slip edges (1).

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