Split stepped drill

Abstract

The utility model discloses a split step drill which comprises a drill body and a drill handle, the drill body is in a step shape and comprises a tip end and a tail end, the outer diameter of the drill body is continuously increased from the tip end to the tail end along the axis of the drill body, and the drill body further comprises a plurality of step blades and a plurality of chip grooves. A plurality of chip grooves are formed in the drill body and extend from the tip end of the drill body to the tail end of the drill body, an assembly groove is formed in the tail end of the drill body, internal threads are arranged on the inner wall of the assembly groove, external threads are arranged at one end of the drill handle, the drill body is in threaded connection with the drill handle, the drill handle is further provided with a limiting part, and the limiting part abuts against the tail end of the drill body. According to the stepped drill, the drill body and the drill handle can be effectively and separately processed according to the requirements of hardness and strength of the drill body and the drill handle, and the problems that the hardness of the stepped drill from the tip end to the tail end is uneven, the tail end hardness is too low, and the drill handle hardness is too high are solved. The drill body and the drill handle are in threaded connection, different types of drill handles can be replaced conveniently, and the drill is suitable for various application scenes.

Description

Technical Field

[0001] The utility model relates to a step drill, in particular to a split step drill. Background Art

[0002] In the existing step drill, the drill body and the drill shank are an integrated structure. After undergoing an integrated heat treatment hardness processing process, the hardness of the step drill is uneven from the tip to the tail end, and its hardness gradually decreases. The hardness of the drill shank reaches a high hardness after heat treatment, while the hardness of the tail end of the drill body connected to it is not enough, which can easily cause the drill shank to be too hard and break, etc. Utility Model Content

[0003] In view of the deficiencies in the existing technology, the utility model aims to provide a split step drill.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a split step drill, including a drill body and a drill shank, the drill body is in a stepped shape, the drill body includes a tip and a tail end, the outer diameter of the drill body continuously increases from the tip along the axis of the drill body toward the tail end, the drill body also includes a plurality of step edges and a plurality of chip grooves, the plurality of chip grooves extend from the tip of the drill body to the tail end, the tail end of the drill body is provided with an assembly groove for accommodating one end of the drill shank, the inner wall of the assembly groove is provided with an internal thread, one end of the drill shank is provided with an external thread, the drill body is threadedly connected to the drill shank, and the drill shank is also provided with a limiting portion, and the limiting portion abuts against the tail end of the drill body.

[0005] Preferably, the drill body comprises two step edges and two chip flutes.

[0006] Preferably, the drill body comprises four step edges and two chip grooves, and the drill body further comprises two auxiliary chip grooves, each of the auxiliary chip grooves extending from the middle portion of the drill body to the rear end.

[0007] Preferably, the chip removal grooves are spirally distributed on the outer surface of the drill body along the axial direction of the drill body.

[0008] Preferably, the chip removal groove gradually increases in width along the axial direction of the drill body as the outer diameter of the drill body gradually increases.

[0009] Preferably, the cross-sectional shape of the drill shank at the end away from the drill body is non-circular.

[0010] Preferably, the cross-section of the drill shank at one end away from the drill body is polygonal.

[0011] Preferably, the cross-section of the drill shank at the end away from the drill body is hexagonal.

[0012] The beneficial effects of the utility model are as follows: the utility model is a split step drill, comprising a drill body and a drill shank. Since an assembly groove is provided at the rear end of the drill body, the original rear end of the drill body is changed from a solid structure at the beginning to a hollow structure, and the heat is more evenly heated in the heat treatment process and the hardness can reach a more ideal state. The drill body and the drill shank can be effectively treated separately according to their own hardness and strength requirements, and the problem of uneven hardness from the tip to the rear end of the step drill, too low hardness of the rear end and too high hardness of the drill shank causing the shank to break is solved.

[0013] The drill body and the drill shank are threadedly connected, which makes it easy to replace different types of drill shanks and is suitable for a variety of application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural exploded diagram of the utility model;

[0015] Figure 2 This is one of the structural schematic diagrams of the drill body of the utility model;

[0016] Figure 3 This is the second structural schematic diagram of the drill body of the utility model;

[0017] Figure 4 This is one of the top views of the drill body of the utility model;

[0018] Figure 5 This is the second top view of the drill body of the utility model;

[0019] Figure 6 This is one of the structural schematic diagrams of the drill handle of the utility model;

[0020] Figure 7 This is the second structural schematic diagram of the drill handle of the utility model;

[0021] Figure 8 This is the third structural schematic diagram of the drill handle of the utility model;

[0022] Fig. 9 This is one of the structural schematic diagrams of the utility model;

[0023] Fig.10 This is the second structural diagram of the utility model;

[0024] Fig.11 This is the third structural diagram of the utility model;

[0025] Fig.12 This is the fourth structural diagram of the utility model;

[0026] Fig.13 This is the fifth structural diagram of the utility model;

[0027] Fig.14 This is the sixth structural diagram of the present utility model. DETAILED DESCRIPTION

[0028] like Figure 1-Figure 14 As shown, a split step drill comprises a drill body 1 and a drill shank 2, wherein the drill body 1 is in a stepped shape, and comprises a tip 11 and a tail end 12, wherein the outer diameter of the drill body 1 increases continuously from the tip 11 along the axis of the drill body 1 toward the tail end 12, and the drill body 1 further comprises a plurality of step edges 3 and a plurality of chip removal grooves 4, wherein the plurality of chip removal grooves 4 extend from the tip 11 of the drill body 1 toward the tail end 12, and the tail end 12 of the drill body 1 is provided with a mounting groove 5 for accommodating one end of the drill shank 2, wherein the inner wall of the mounting groove 5 is provided with an internal thread, and one end of the drill shank 2 is provided with an external thread, the drill body 1 is threadedly connected with the drill shank 2, and a limiting portion 7 is provided on the drill shank 2, and the limiting portion 7 abuts against the tail end 12 of the drill body 1; when installing the drill shank 2, it is necessary to screw the end of the drill shank 2 provided with the external thread along the internal thread of the mounting groove 5 of the drill body 1 until it abuts against the limiting portion 7.

[0029] In the above structure, the drill body 1 and the drill shank 2 are connected by a detachable threaded connection, which facilitates the replacement of different types of drill shanks 2 and is suitable for a variety of application scenarios.

[0030] In this example, the drill body 1 includes two step edges 3 and two chip removal grooves 4 .

[0031] In this example, the drill body 1 includes four step edges 3 and two chip grooves 4 , and the drill body 1 also includes two auxiliary chip grooves 6 , each of which extends from the middle of the drill body 1 to the tail end 12 .

[0032] In this example, the chip removal grooves 4 are spirally distributed on the outer surface of the drill body 1 along the axial direction of the drill body 1 .

[0033] In this example, the chip removal groove 4 increases gradually along the axial direction of the drill body 1 as the outer diameter of the drill body 1 increases, and the groove width thereof also increases gradually accordingly.

[0034] In this example, the cross-sectional shape of the end of the drill shank 2 away from the drill body 1 is non-circular.

[0035] In this example, the cross-sectional shape of the end of the drill shank 2 away from the drill body 1 is a polygon.

[0036] In this example, the cross-sectional shape of the drill shank 2 at the end away from the drill body 1 is hexagonal.

[0037] The utility model is a split step drill, comprising a drill body 1 and a drill shank 2. Since the rear end 12 of the drill body 1 is provided with an assembly groove 5, the rear end 12 of the original drill body 1 is changed from a solid structure to a hollow structure, and the heat is more uniformly heated in the heat treatment process and the hardness can reach a more ideal state. The drill body 1 and the drill shank 2 can be effectively treated separately according to the needs of their own hardness and strength, and the problem of uneven hardness from the tip 11 to the rear end 12 of the step drill, too low hardness of the rear end 12 and too high hardness of the drill shank 2 causing the shank to break is solved.

[0038] The above shows and describes the basic principle, main features and advantages of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, simple changes and substitutions by ordinary technicians in this field are within the protection scope of the utility model.

Claims

1. A split step drill, characterized in that: The drill body comprises a drill body and a drill shank, wherein the drill body is in a stepped shape, comprises a tip and a tail end, and the outer diameter of the drill body increases continuously from the tip along the axis of the drill body toward the tail end, the drill body further comprises a plurality of stepped edges and a plurality of chip grooves, the plurality of chip grooves extend from the tip of the drill body toward the tail end, the tail end of the drill body is provided with an assembly groove for accommodating one end of the drill shank, the inner wall of the assembly groove is provided with an internal thread, one end of the drill shank is provided with an external thread, the drill body is threadedly connected to the drill shank, the drill shank is further provided with a limiting portion, and the limiting portion abuts against the tail end of the drill body.

2. A split step drill according to claim 1, characterized in that: The drill body comprises two step edges and two chip removal grooves.

3. A split step drill according to claim 1, characterized in that: The drill body comprises four step edges and two chip removal grooves, and the drill body also comprises two auxiliary chip removal grooves, each of which extends from the middle part of the drill body to the tail end.

4. A split step drill according to any one of claims 1 to 3, characterized in that: The chip removal grooves are spirally distributed on the outer surface of the drill body along the axial direction of the drill body.

5. A split step drill according to any one of claims 1 to 3, characterized in that: The chip removal groove gradually increases along the axial direction of the drill body as the outer diameter of the drill body increases, and the groove width thereof also gradually increases accordingly.

6. A split step drill according to claim 1, characterized in that: The cross-sectional shape of the drill shank at one end away from the drill body is non-circular.

7. A split step drill according to claim 6, characterized in that: The cross-section of the drill shank at one end away from the drill body is in a polygonal shape.

8. A split step drill according to claim 7, characterized in that: The cross-section of the drill shank at one end away from the drill body is hexagonal.

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