Four-edge eccentric alloy drill bit

Abstract

The utility model relates to a four-edge eccentric alloy drill bit which comprises a drill rod and a tool bit arranged at the end of the drill rod. The tool bit comprises a first blade, a second blade and a third blade which are sequentially and annularly distributed around the central axis A of the tool bit at intervals in the circumferential direction. A first cutting surface is formed on the first blade, a second cutting surface is formed on the second blade, and a third cutting surface is formed on the third blade; one tail end of the first cutting face, one tail end of the second cutting face and one tail end of the third cutting face converge to form a blade point, and the blade point deviates from the central axis A of the tool bit. The swing drilling tool has the advantages that swing drilling can be achieved when the tool bit drills, so that the load borne by the tool bit during drilling can be greatly reduced, and the temperature rise rate of the tool bit during drilling is effectively restrained.

Description

Technical Field

[0001] The present application relates to the technical field of alloy drill bits, and in particular to a four-edged eccentric alloy drill bit. Background Art

[0002] At present, alloy drill bits generally refer to drill bits that use carbide as the cutting part. This type of drill bit is more durable than high-speed steel drill bits, can withstand higher temperatures, and performs better when processing materials with higher hardness.

[0003] The alloy drill bits used in related art are prone to burning during the drilling process due to repeated force acting on the same force point and surface. This can lead to the drill bits becoming red-hot, resulting in poor product durability, severe tool wear, and fragile cutter heads. This ultimately leads to unstable product quality and poor chip removal. This accelerated drill wear not only increases production costs but also compromises product quality. Utility Model Content

[0004] The present application provides a four-edged eccentric alloy drill bit, which can effectively suppress the temperature rise rate of the cutter head during drilling, thereby improving the drilling efficiency and further extending the service life of the cutter head. In addition, it can also achieve the effect of efficient chip removal.

[0005] The present application provides a four-edge eccentric alloy drill bit adopting the following technical solution:

[0006] A four-blade eccentric alloy drill bit includes a drill rod and a cutter head arranged at the end of the drill rod; the cutter head includes a first blade, a second blade, and a third blade that are circumferentially spaced around the cutter head's central axis A; a first cutting surface is formed on the first blade, a second cutting surface is formed on the second blade, and a third cutting surface is formed on the third blade; one end of the first cutting surface, the second cutting surface, and the third cutting surface converge to form a cutting tip, and the cutting tip deviates from the central axis A of the cutter head.

[0007] Preferably, the cutter head also includes a fourth blade, and the first blade, second blade, third blade, and fourth blade are circumferentially arranged in sequence around the central axis A of the cutter head; a fourth cutting surface is formed on the fourth blade; the first cutting surface and the third cutting surface are arranged opposite to each other, and the first cutting surface and the third cutting surface are connected to form a first cutting edge, and the tip of the blade is formed on one side of the first cutting edge.

[0008] Preferably, the first cutting surface, the second cutting surface, the third cutting surface and the fourth cutting surface are all arranged in an arc shape along the direction of the cutting edge, and are gradually inclined toward the direction of the central axis A of the cutting head.

[0009] Preferably, the second cutting surface and the fourth cutting surface are arranged opposite to each other, and one end of the second cutting surface and the fourth cutting surface are respectively located on both sides of the first cutting edge; and one end of the first cutting edge away from the tip is connected to the second cutting surface.

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

[0011] Preferably, the second cutting surface is connected to the third cutting surface, and a fourth cutting edge is formed therebetween; the length of the fourth cutting edge is greater than that of the third cutting edge.

[0012] Preferably, the third cutting surface is connected to the fourth cutting surface, and a fifth cutting edge is formed therebetween, and the length of the fifth cutting edge is smaller than that of the second cutting edge.

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

[0014] Because the cutting edge deviates from the center axis A, the cutter head can achieve swing drilling during drilling, which can greatly reduce the load on the cutter head during drilling and effectively suppress the temperature rise rate of the cutter head during drilling. While improving the drilling efficiency, it can further extend the service life of the cutter head and greatly enhance the overall chip removal effect, achieving the purpose of efficient chip removal. In addition, all aspects of drilling performance are significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0016] Figure 2 yes Figure 1 A top view of

[0017] Figure 3 It is a front view of the local structure of the first cutting surface;

[0018] Figure 4 It is a front view of the local structure of the second cutting surface;

[0019] Figure 5 It is a front view of the local structure of the third cutting surface;

[0020] Figure 6 It is a front view of the local structure of the fourth cutting surface.

[0021] Explanation of the accompanying drawings: 1. drill rod; 2. cutter head; 20. cutting tip; 21. first blade; 210. first cutting surface; 22. second blade; 220. second cutting surface; 23. third blade; 230. third cutting surface; 24. fourth blade; 240. fourth cutting surface; 3. first cutting edge; 4. second cutting edge; 5. third cutting edge; 6. fourth cutting edge; 7. fifth cutting edge. DETAILED DESCRIPTION

[0022] The present application is further described in detail below with reference to the accompanying drawings.

[0023] The embodiment of the present application discloses a four-edged eccentric alloy drill bit.

[0024] Reference Figure 1 、 Figure 2 The four-blade eccentric alloy drill bit includes a drill rod 1 and a cutter head 2 fixedly mounted at the end of the drill rod 1. The cutter head 2 also includes four blades, a first blade 21, a second blade 22, a third blade 23, and a fourth blade 24, which are evenly spaced circumferentially around the central axis A of the cutter head 2. A cutting tip 20 is formed at the end of the cutter head 2. The cutting tip 20 is located at the highest point of the end of the cutter head 2 and is offset from the central axis A.

[0025] like Figure 2 、 Figure 3 As shown, a first cutting surface 210 is formed on the first blade 21, a second cutting surface 220 is formed on the second blade 22, a third cutting surface 230 is formed on the third blade 23, and a fourth cutting surface 240 is formed on the fourth blade 24. The first cutting surface 210, the second cutting surface 220, and the third cutting surface 230 converge at one end to form a cutting edge 20, which is offset from the central axis A of the cutter head 2. The first cutting surface 210, the second cutting surface 220, the third cutting surface 230, and the fourth cutting surface 240 are all arranged in an arc shape along the direction of the cutting edge 20 and are gradually inclined toward the central axis A of the cutter head 2.

[0026] like Figure 4 、 Figure 5 As shown, the first cutting surface 210, the third cutting surface 230, and the fourth cutting surface 240 are respectively connected to the top cutting edge 20. The first cutting surface 210 and the third cutting surface 230 are arranged opposite each other, and the top of the first cutting surface 210 is connected to the top of the third cutting surface 230. The first cutting edge 3 is formed at the junction of the first cutting surface 210 and the third cutting surface 230, and the cutting edge 20 is formed on one side of the first cutting edge 3.

[0027] like Figure 4 、 Figure 6As shown, the second cutting surface 220 and the fourth cutting surface 240 are arranged opposite to each other, and one end of the second cutting surface 220 and the fourth cutting surface 240 are respectively located on both sides of the first cutting edge 3. The end of the first cutting edge 3 away from the tip 20 is connected to the top of the second cutting surface 220.

[0028] like Figure 4 、 Figure 6 As shown, one side of the first cutting surface 210 is connected to the fourth cutting surface 240, and the second cutting edge 4 is formed at the junction of the two. The other side wall of the first cutting surface 210 away from the fourth cutting surface 240 is connected to the second cutting surface 220, and the third cutting edge 5 is formed at the junction of the two. The length of the second cutting edge 4 is greater than that of the third cutting edge 5.

[0029] like Figure 5 、 Figure 6 As shown, the side of the second cutting surface 220 away from the first cutting surface 210 is connected to the third cutting surface 230, and the connection between the two forms a fourth cutting edge 6. The length of the fourth cutting edge 6 is greater than the length of the third cutting edge 5. The side of the third cutting surface 230 away from the second cutting surface 220 is connected to the fourth cutting surface 240, and the connection between the two forms a fifth cutting edge 7, which is less than the length of the second cutting edge 4. The tops of the second cutting edge 4 and the fifth cutting edge 7 are both connected to the cutting edge 20.

[0030] The implementation principle is as follows: Since the cutting edge 20 deviates from the central axis A, the cutter head 2 can achieve swing drilling during drilling, thereby greatly reducing the load on the cutter head 2 during drilling and effectively suppressing the temperature rise rate of the cutter head 2 during drilling; when the cutter head 2 is drilling, waste chips can be discharged more smoothly, reducing chip removal resistance. At the same time, it can also prevent the cutter head 2 from having edge blasting defects, improve drilling efficiency, and further extend the service life of the cutter head 2. At the same time, it can greatly enhance the overall chip removal effect, achieving the purpose of efficient chip removal. In addition, all aspects of drilling performance are significantly improved. In addition, since the height and inclination angle of each cutting edge are different and are distributed in a spiral shape, it is ensured that each cutting edge will not contact the drilling surface at the same time during drilling. Each cutting edge will be subjected to force one by one during drilling. The spirally distributed cutting edges can effectively suppress the temperature rise rate of the cutter head and facilitate chip removal.

[0031] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A four-edged eccentric alloy drill bit, comprising a drill rod (1) and a cutter head (2) arranged at the end of the drill rod (1); characterized in that: The cutter head (2) comprises a first blade (21), a second blade (22), and a third blade (23) which are circumferentially arranged in sequence around a central axis A of the cutter head (2); a first cutting surface (210) is formed on the first blade (21), a second cutting surface (220) is formed on the second blade (22), and a third cutting surface (230) is formed on the third blade (23); one end of the first cutting surface (210), the second cutting surface (220), and the third cutting surface (230) converge to form a cutting edge (20), and the cutting edge (20) deviates from the central axis A of the cutter head (2).

2. The four-edge eccentric alloy drill according to claim 1, characterized in that: The cutter head (2) further comprises a fourth blade (24), wherein the first blade (21), the second blade (22), the third blade (23), and the fourth blade (24) are circumferentially arranged in sequence and at intervals around the central axis A of the cutter head (2); a fourth cutting surface (240) is formed on the fourth blade (24); the first cutting surface (210) and the third cutting surface (230) are arranged opposite to each other, and the first cutting surface (210) and the third cutting surface (230) are connected to form a first cutting edge (3), and the blade tip (20) is formed on one side of the first cutting edge (3).

3. The four-edge eccentric alloy drill according to claim 2, characterized in that: The first cutting surface (210), the second cutting surface (220), the third cutting surface (230) and the fourth cutting surface (240) are all arranged in an arc shape along the direction of the blade tip (20) and are gradually inclined towards the direction of the central axis A of the cutter head (2).

4. The four-edge eccentric alloy drill according to claim 2, characterized in that: The second cutting surface (220) and the fourth cutting surface (240) are arranged opposite to each other, and one end of the second cutting surface (220) and the fourth cutting surface (240) are respectively located on both sides of the first cutting edge (3); and one end of the first cutting edge (3) away from the blade tip (20) is connected to the second cutting surface (220).

5. The four-edge eccentric alloy drill according to claim 4, characterized in that: One side of the first cutting surface (210) is connected to the fourth cutting surface (240), and a second cutting edge (4) is formed between the two; the other side of the first cutting surface (210) is connected to the second cutting surface (220), and a third cutting edge (5) is formed between the two; the length of the second cutting edge (4) is greater than the length of the third cutting edge (5).

6. The four-edge eccentric alloy drill according to claim 5, characterized in that: The second cutting surface (220) is connected to the third cutting surface (230), and a fourth cutting edge (6) is formed between the two; the length of the fourth cutting edge (6) is greater than the length of the third cutting edge (5).

7. The four-edge eccentric alloy drill according to claim 6, characterized in that: The third cutting surface (230) is connected to the fourth cutting surface (240), and a fifth cutting edge (7) is formed between the two. The length of the fifth cutting edge (7) is less than the length of the second cutting edge (4).

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