Step drill

Abstract

The step drill comprises a drill handle, a first drill body, a second drill body, a drill tip and a chip groove, the drill handle, the first drill body and the second drill body are coaxially arranged, one end of the drill handle is connected with the first drill body, the end, away from the drill handle, of the first drill body is connected with the second drill body, and the end, away from the first drill body, of the second drill body is connected with the drill tip. The chip groove is spiral, one end of the chip groove is located on the periphery of the drill handle, the other end of the chip groove extends to the end of the drill tip, and a chisel edge is arranged at the position, located at the end of the chip groove, of the drill tip. According to the utility model, the brim can be prevented from being generated during drilling, so that the brim is prevented from being clamped into a hole during flushing.

Description

Technical Field

[0001] The utility model relates to the technical field of drill bits, and more particularly to a step drill. Background Art

[0002] When drilling stepped holes, a brim forms at the point of penetration. During subsequent cleaning, the brim can be impacted by the water flow and dislodged from the penetration point, potentially being carried into the stepped hole. The brim that enters the stepped hole can become lodged in the smaller diameter hole within the stepped hole, affecting the quality of the finished hole. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a step drill.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model discloses a stepped drill, comprising a drill shank, a first drill body, a second drill body, a drill tip and a chip groove. The drill shank, the first drill body and the second drill body are coaxially arranged, one end of the drill shank is connected to the first drill body, the end of the first drill body away from the drill shank is connected to the second drill body, and the end of the second drill body away from the first drill body is connected to the drill tip. The chip groove is spiral, one end of the chip groove is located at the outer periphery of the drill shank, and the other end of the chip groove extends to the top of the drill tip. A chisel edge is provided on the drill tip at the end of the chip groove.

[0006] Furthermore, two chip removal grooves are provided and symmetrically distributed on both sides of the step drill.

[0007] Furthermore, the diameter of the first drill body is smaller than the diameter of the drill shank, and the diameter of the second drill body is smaller than the diameter of the first drill body.

[0008] Furthermore, a first counter-chamfer is provided between the drill shank and the first drill body, and a second counter-chamfer is provided between the first drill body and the second drill body.

[0009] Furthermore, the drill shank, the first drill body, the second drill body and the drill tip are integrally formed.

[0010] The beneficial effects of the utility model are as follows: a second drill body and a drill tip are added to the first drill body, and a chisel edge is provided on the drill tip. After the drill tip first drills through a hole, the chisel edge can cut the hole wall, thereby removing the cap edge generated at the punching position during the initial drilling, thereby ensuring that impurities will not fall into the formed stepped hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a structural diagram of a step drill in this embodiment;

[0012] Figure 2 for Figure 1 A magnified schematic diagram of point A in the middle;

[0013] Figure 3 This is a front view of a step drill in this embodiment;

[0014] Figure 4 A top view of the step drill in this embodiment;

[0015] Figure 5 It is a side view of the step drill in this embodiment.

[0016] Reference numerals: 1, drill shank; 2, first drill body; 3, second drill body; 4, drill tip; 5, chip flute; 6, first chamfer; 7, second chamfer; 8, chisel edge. DETAILED DESCRIPTION

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

[0018] As attached Figure 1 -Attached Figure 5 As shown, a step drill comprises a drill shank 1, a first drill body 2, a second drill body 3, a drill tip 4, and a chip flute 5. The drill shank 1 has a length of 50 mm and a diameter of 5 mm. The first drill body 2 has a length of 4.5 mm and a diameter of 3.1 mm. The second drill body 3 has a diameter of 2.3 mm and a length of 0.5 mm. The drill shank 1, the first drill body 2, and the second drill body 3 are coaxially arranged, with one end of the drill shank 1 connected to the first drill body 2, the end of the first drill body 2 away from the drill shank 1 being connected to the second drill body 3, and the end of the second drill body 3 away from the first drill body 2 being connected to the drill tip 4. The chip flute 5 is spiral-shaped, with one end of the chip flute 5 located on the outer periphery of the drill shank 1 and the other end of the chip flute 5 extending to the end of the drill tip 4. A chisel edge 8 is provided on the drill tip 4 at the end of the chip flute 5, and the two chisel edges 8 are symmetrically arranged. After the drill tip 4 penetrates the hole, the chisel edge 8 can cut the hole wall, thereby removing the brim produced when the hole is first drilled, avoiding the quality problem caused by the brim entering the small hole and remaining in the small hole during the flushing process.

[0019] Furthermore, two chip flutes 5 are provided, symmetrically distributed on both sides of the step drill. The chip flutes 5 can effectively discharge chips from the cutting area and keep the cutting area clean.

[0020] Furthermore, the diameter of the first drill body 2 is smaller than the diameter of the drill shank 1 , and the diameter of the second drill body 3 is smaller than the diameter of the first drill body 2 .

[0021] Furthermore, a first counter-chamfer 6 is provided between the drill shank 1 and the first drill body 2. The first counter-chamfer 6 has a frustoconical structure, with the larger diameter end of the first counter-chamfer 6 connected to the drill shank 1 and the smaller diameter end of the first counter-chamfer 6 connected to the first drill body 2. A second counter-chamfer 7 is provided between the first drill body 2 and the second drill body 3. The second counter-chamfer 7 has a frustoconical structure, with the larger diameter end of the second counter-chamfer 7 connected to the first drill body 2 and the smaller diameter end of the second counter-chamfer 7 connected to the second drill body 3. The arrangement of the first counter-chamfer 6 and the second counter-chamfer 7 can meet the required reverse chamfering of the workpiece and prevent the formation of burrs or barbs on the workpiece.

[0022] Furthermore, the drill shank 1, the first drill body 2, the second drill body 3 and the drill tip 4 are integrally formed and are all made of cemented carbide. The integrally formed design improves the stability of the overall structure, helps to reduce vibration and deformation, and improves the accuracy and stability of drilling.

[0023] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A step drill, characterized in that: The drill comprises a drill shank (1), a first drill body (2), a second drill body (3), a drill tip (4) and a chip flute (5); the drill shank (1), the first drill body (2) and the second drill body (3) are coaxially arranged; one end of the drill shank (1) is connected to the first drill body (2); the end of the first drill body (2) away from the drill shank (1) is connected to the second drill body (3); the end of the second drill body (3) away from the first drill body (2) is connected to the drill tip (4); the chip flute (5) is spiral-shaped; one end of the chip flute (5) is located on the outer periphery of the drill shank (1); the other end of the chip flute (5) extends to the end of the drill tip (4); a chisel edge (8) is provided on the drill tip (4) at the end of the chip flute (5).

2. A step drill according to claim 1, characterized in that: The chip removal grooves (5) are provided with two and are symmetrically distributed on both sides of the step drill.

3. A step drill according to claim 1, characterized in that: The diameter of the first drill body (2) is smaller than the diameter of the drill shank (1), and the diameter of the second drill body (3) is smaller than the diameter of the first drill body (2).

4. A step drill according to claim 1, characterized in that: The drill shank (1), the first drill body (2), the second drill body (3) and the drill tip (4) are integrally formed.

5. A step drill according to claim 1, characterized in that: A first chamfer (6) is provided between the drill shank (1) and the first drill body (2).

6. A step drill according to claim 5, characterized in that: A second chamfer (7) is provided between the first drill body (2) and the second drill body (3).

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