Eccentric dry drilling bit

Abstract

The utility model relates to an eccentric dry driving drill bit which comprises a drill rod and a tool bit arranged at the head of the drill rod. A first cutting face and a second cutting face are formed on the side walls, deviating from each other, of the tool bit respectively. A third cutting face is formed on the side, away from the drill rod, of the first cutting face, and the third cutting face is obliquely arranged in the direction close to the second cutting face. A first cutting edge located between the third cutting face and the second cutting face is formed on the top of the tool bit. The drilling effect of the tool bit is ensured, the drilling efficiency is greatly improved, the chip removal efficiency can be greatly improved, meanwhile, the abrasion degree of the tool bit can be effectively relieved, the tool bit is not prone to cracking or collapsing after long-time drilling, the service life of the tool bit is remarkably prolonged, and the drilling efficiency is improved.

Description

Technical Field

[0001] This application relates to the technical field of alloy drills, and in particular to an eccentric dry drilling bit. Background Art

[0002] At present, cemented carbide is an alloy material made by powder metallurgy process from hard compounds of refractory metals and binding metals. Cemented carbide has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance, corrosion resistance, etc. Especially its high hardness and wear resistance, cemented carbide is widely used as tool materials, such as turning tools, milling cutters, planing cutters, drill bits, etc., for cutting cast iron, non-ferrous metals, plastics, chemical fibers, graphite, glass, stone and ordinary steel, and can also be used to cut difficult-to-machine materials such as heat-resistant steel, stainless steel, high-manganese steel, tool steel, etc.

[0003] In the related art, during the drilling process of alloy drills, due to the high drilling temperature, large tool wear, and easy damage of the tool tip, the quality of the processed products is unstable, the surface roughness of the drilled holes is large, and the chip removal effect is poor. The accelerated wear of the drill bit not only increases the production cost, but also cannot guarantee the quality of the products. Utility Model Content

[0004] This application provides an eccentric dry drilling bit, which has the effects of effectively prolonging the service life of the drill bit, improving the drilling efficiency, and enhancing the chip removal ability.

[0005] The eccentric dry drilling bit provided by this application adopts the following technical solutions:

[0006] An eccentric dry drilling bit includes a drill rod and a tool tip provided at the head of the drill rod; first cutting surfaces and second cutting surfaces are respectively formed on the side walls of the tool tip facing away from each other; a third cutting surface is formed on the side of the first cutting surface away from the drill rod, and the third cutting surface is inclined towards the direction close to the second cutting surface; a fourth cutting surface and a fifth cutting surface are also formed on the tool tip, and a first cutting edge located between the third cutting surface and the second cutting surface is formed at the top of the tool tip; the fourth cutting surface and the fifth cutting surface are respectively located on both sides of the first cutting edge; a cutting edge tip is formed at one end of the first cutting edge, and the cutting edge tip is offset from the central axis A of the drill rod.

[0007] Preferably, the fourth cutting surface is located between the first cutting surface and the second cutting surface, and the fourth cutting surface is inclined towards the direction close to the first cutting edge; the top of the fourth cutting surface is connected to the first cutting edge.

[0008] Preferably, one side of the fourth cutting surface is connected to the third cutting surface, and a second cutting edge is formed between them; the other side of the fourth cutting surface is connected to the second cutting surface, and a third cutting edge is formed between them.

[0009] Preferably, the fifth cutting surface is located between the third cutting surface and the second cutting surface; the fifth cutting surface is inclined towards the first cutting edge, and the top of the fifth cutting surface is connected to the first cutting edge; the fourth cutting surface and the fifth cutting surface are respectively located on both sides of the first cutting edge.

[0010] Preferably, one side of the fifth cutting surface is connected to the third cutting surface, and a fourth cutting edge is formed therebetween; the other side of the fifth cutting surface is connected to the second cutting surface, and a fifth cutting edge is formed therebetween.

[0011] Preferably, a sixth cutting surface is formed on the side of the fifth cutting surface away from the first cutting edge; a first included angle a is formed between the sixth cutting surface and the central axis A of the drill pipe, a second included angle b is formed between the fourth cutting surface and the central axis A of the drill pipe, and the first included angle a is smaller than the second included angle b.

[0012] Preferably, one side of the sixth cutting surface is connected to the third cutting surface, and a sixth cutting edge is formed therebetween; the other side of the sixth cutting surface is connected to the second cutting surface, and a seventh cutting edge is formed therebetween; an eighth cutting edge is formed between the sixth cutting surface and the fifth cutting surface.

[0013] In summary, the present application includes at least one of the following beneficial technical effects:

[0014] The tip of the cutting edge deviates from the central axis A of the drill pipe. Therefore, the cutting head can swing during drilling, which can greatly reduce the load on the cutting head during drilling, effectively inhibit the temperature rise rate of the cutting head during drilling, and greatly improve the drilling efficiency; on the other hand, it can also polish the hole wall during drilling, ensuring the smoothness of the hole wall; in addition, it can greatly improve the chip removal efficiency, and at the same time effectively relieve the wear of the cutting head. The cutting head is not prone to cracking and breaking after long-term drilling, significantly improving the service life of the cutting head and the drilling efficiency. In addition, since the heights and inclination angles of the respective cutting edges are different and are distributed in a spiral manner, it is ensured that the respective cutting edges do not simultaneously contact the drilling surface during drilling. Each cutting edge will be stressed one by one during drilling, and the cutting edges distributed in a spiral manner can effectively inhibit the temperature rise rate of the cutting head and contribute to chip removal by splitting the cutting edges. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present application;

[0016] Figure 2 is Figure 1 a partial structure schematic diagram from the top view;

[0017] Figure 3 is a partial structure schematic diagram highlighting the sixth cutting surface;

[0018] Figure 4 It is a partial structural schematic diagram highlighting the fourth cutting surface;

[0019] Figure 5 It is a partial structural schematic diagram highlighting the first included angle a and the second included angle b.

[0020] Explanation of reference numerals: 1, drill pipe; 2, cutter head; 20, first cutting surface; 21, second cutting surface; 22, third cutting surface; 23, fourth cutting surface; 24, fifth cutting surface; 25, sixth cutting surface; 3, first cutting edge; 30, cutting edge tip; 4, second cutting edge; 5, third cutting edge; 6, fourth cutting edge; 7, fifth cutting edge; 8, sixth cutting edge; 9, seventh cutting edge; 10, eighth cutting edge. Detailed implementation manners

[0021] The following further elaborates on the present application with reference to the accompanying drawings.

[0022] An embodiment of the present application discloses an eccentric dry drilling bit.

[0023] Refer to Figure 1 , Figure 2 , the eccentric dry drilling bit includes a drill pipe 1 and a cutter head 2 provided at the head of the drill pipe 1. The cutter head 2 is used for drilling holes. A first cutting surface 20 and a second cutting surface 21 are formed on the side wall of the end of the cutter head 2 facing away from the drill pipe 1. The first cutting surface 20 and the second cutting surface 21 are respectively located on the outer side walls of the cutter head 2 facing away from each other, and the first cutting surface 20 and the second cutting surface 21 are inclined in the direction of approaching each other.

[0024] As Figure 3 , Figure 4 shown, a third cutting surface 22 is formed on the side of the first cutting surface 20 away from the drill pipe 1. The third cutting surface 22 is inclined in the direction of approaching the second cutting surface 21. A first cutting edge 3 is formed at the top of the cutter head 2 between the third cutting surface 22 and the second cutting surface 21. One end of the first cutting edge 3 forms a cutting edge tip 30. The cutting edge tip 30 is located at the highest point of the end of the cutter head 2, and the position of the cutting edge tip 30 deviates from the central axis A of the drill pipe 1.

[0025] As Figure 3 , Figure 4 shown, a fourth cutting surface 23 is further formed on the cutter head 2. The fourth cutting surface 23 is located between the first cutting surface 20 and the second cutting surface 21, and the fourth cutting surface 23 is inclined in the direction of approaching the first cutting edge 3. The top of the fourth cutting surface 23 is connected to the first cutting edge 3. One side of the fourth cutting surface 23 is connected to the adjacent third cutting surface 22, and a second cutting edge 4 is formed therebetween. The other side of the fourth cutting surface 23 is connected to the adjacent second cutting surface 21, and a third cutting edge 5 is formed therebetween.

[0026] As shown in Figure 3 , Figure 4 As shown, a fifth cutting surface 24 is further formed on the outer side wall of the top of the cutter head 2. The fifth cutting surface 24 is located between the third cutting surface 22 and the second cutting surface 21. The top of the fifth cutting surface 24 is inclined towards the direction close to the first cutting edge 3 and is connected to the first cutting edge 3. The fourth cutting surface 23 and the fifth cutting surface 24 are respectively located on both sides of the first cutting edge 3. One side of the fifth cutting surface 24 is connected to the adjacent third cutting surface 22, and a fourth cutting edge 6 is formed therebetween. The other side of the fifth cutting surface 24 is connected to the adjacent second cutting surface 21, and a fifth cutting edge 7 is formed therebetween.

[0027] As shown in Figure 2 , Figure 5 As shown, a sixth cutting surface 25 is formed on the side of the fifth cutting surface 24 away from the first cutting edge 3. A first included angle a is formed between the sixth cutting surface 25 and the central axis A of the drill pipe 1. A second included angle b is formed between the fourth cutting surface 23 and the central axis A of the drill pipe 1. The angle of the first included angle a is smaller than the angle of the second included angle b. One side of the sixth cutting surface 25 is connected to the adjacent third cutting surface 22, and a sixth cutting edge 8 is formed therebetween. The other side of the sixth cutting surface 25 is connected to the adjacent second cutting surface 21, and a seventh cutting edge 9 is formed therebetween. An eighth cutting edge 10 is formed between the top of the sixth cutting surface 25 and the fifth cutting surface 24.

[0028] The implementation principle is as follows: Since the position of the cutting edge tip 30 deviates from the central axis A of the drill pipe 1, the cutter head 2 can achieve rocking drilling during drilling, thereby greatly reducing the load on the cutter head 2 during drilling, effectively suppressing the temperature rise rate of the cutter head 2 during drilling, and greatly improving the drilling efficiency. On the other hand, during drilling, it can also polish the hole wall drilled, ensuring the smoothness of the hole wall. In addition, it can greatly improve the chip removal efficiency, and at the same time effectively relieve the wear degree of the cutter head 2. The cutter head 2 is not prone to cracking and chipping after long-term drilling, significantly improving the service life of the cutter head 2 and improving the drilling efficiency. In addition, since the heights and inclination angles of the respective cutting edges are different and are distributed in a spiral manner, it is ensured that the respective cutting edges will not contact the drilling surface simultaneously during drilling. The cutting edges distributed in a spiral manner can effectively suppress the temperature rise rate of the cutter head and contribute to chip splitting and chip removal.

[0029] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. An eccentric dry drilling bit, comprising a drill pipe (1) and a cutter head (2) provided at the head of the drill pipe (1); characterized in that: On the side walls of the cutter head (2) facing away from each other, a first cutting surface (20) and a second cutting surface (21) are respectively formed; on the side of the first cutting surface (20) away from the drill pipe (1), a third cutting surface (22) is formed, and the third cutting surface (22) is inclined towards the second cutting surface (21); a fourth cutting surface (23) and a fifth cutting surface (24) are also formed on the cutter head (2), and at the top of the cutter head (2), a first cutting edge (3) located between the third cutting surface (22) and the second cutting surface (21) is formed; the fourth cutting surface (23) and the fifth cutting surface (24) are respectively located on both sides of the first cutting edge (3); at one end of the first cutting edge (3), a cutting tip (30) is formed, and the cutting tip (30) deviates from the central axis A of the drill pipe (1).

2. The eccentric dry drilling bit according to claim 1, characterized in that: The fourth cutting surface (23) is located between the first cutting surface (20) and the second cutting surface (21), and the fourth cutting surface (23) is inclined towards the first cutting edge (3); the top of the fourth cutting surface (23) is connected to the first cutting edge (3).

3. The eccentric dry drilling bit according to claim 2, wherein: One side of the fourth cutting surface (23) is connected to the third cutting surface (22), and a second cutting edge (4) is formed therebetween; the other side of the fourth cutting surface (23) is connected to the second cutting surface (21), and a third cutting edge (5) is formed therebetween.

4. The eccentric dry drilling bit according to claim 2, characterized in that: The fifth cutting surface (24) is located between the third cutting surface (22) and the second cutting surface (21); the fifth cutting surface (24) is inclined towards the first cutting edge (3), and the top of the fifth cutting surface (24) is connected to the first cutting edge (3).

5. The eccentric dry drilling bit according to claim 4, wherein: One side of the fifth cutting surface (24) is connected to the third cutting surface (22), and a fourth cutting edge (6) is formed therebetween; the other side of the fifth cutting surface (24) is connected to the second cutting surface (21), and a fifth cutting edge (7) is formed therebetween.

6. The eccentric dry drilling bit according to claim 4, characterized in that: On the side of the fifth cutting surface (24) away from the first cutting edge (3), a sixth cutting surface (25) is formed; a first included angle a is formed between the sixth cutting surface (25) and the central axis A of the drill pipe (1), a second included angle b is formed between the fourth cutting surface (23) and the central axis A of the drill pipe (1), and the first included angle a is smaller than the second included angle b.

7. The eccentric dry drilling bit according to claim 6, characterized in that: One side of the sixth cutting surface (25) is connected to the third cutting surface (22), and a sixth cutting edge (8) is formed therebetween; the other side of the sixth cutting surface (25) is connected to the second cutting surface (21), and a seventh cutting edge (9) is formed therebetween; an eighth cutting edge (10) is formed between the sixth cutting surface (25) and the fifth cutting surface (24).

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