Step drill composite screw tap

Abstract

The utility model discloses a composite screw tap of a stepped drill, and belongs to the technical field of machining equipment. Comprising a drill bit, a drill body and a handle part, the drill bit is composed of a plurality of steps with gradually increased diameters from top to bottom, and the steps are in transition connection through chamfers; the drill body is composed of a drill body A, a screw tap part, a drill body B and a chip groove. The drill bit, the drill body A, the screw tap part and the drill body B are sequentially connected in a coherent mode. The chip grooves are continuously formed in the surfaces of the drill bit and the drill body; according to the utility model, the traditional process of frequently replacing a drill bit is changed, and the drill bit part is designed into a step type, so that the cutting is easier, the precision of a processed hole is higher, and the precision of threads can be better ensured; meanwhile, the stepped drill bit can calibrate the hole in the drilling process, and the problem of hole angle deviation is avoided; and the inner wall of the hole can be ensured to be smooth, so that the thread precision in the tapping process is ensured.

Description

Technical Field

[0001] The utility model relates to a step drill composite tap and belongs to the technical field of machining equipment. Background Art

[0002] In the technical field of machining equipment, drilling and tapping are usually divided into two processes. When in use, the workpiece is first clamped, and a drill is used to drill a hole, and then a tap is replaced for tapping. This process results in many processing steps, complicated operations, and is not conducive to efficient production; in addition, the step of replacing the drill with the tap is prone to precision errors; for example, a Chinese utility model patent with authorization announcement number CN205888177 U discloses an integrated drilling and tapping tool with high processing precision. Although the tool solves the problem of replacing drills and taps in the prior art, the processing precision problem needs to be improved; the drill part of the tool will cause angular deviation of the drilled hole and uneven inner wall of the hole during use, resulting in low thread precision in the tapping step; therefore, a tool that is easy to cut, has high hole precision, and can ensure thread precision is needed. Utility Model Content

[0003] The utility model aims at solving the problems existing in the prior art and provides a stepped drill composite tap.

[0004] The purpose of the utility model is achieved through the following technical scheme: a stepped drill composite tap, comprising a drill bit, a drill body and a shank, wherein the drill bit is composed of a plurality of steps with increasing diameters from top to bottom, and each layer of steps is connected by a chamfer transition; the drill body is composed of a drill body A, a tap part, a drill body B and a chip groove, and the drill bit, the drill body A, the tap part and the drill body B are connected in sequence; the chip groove is continuously arranged on the surfaces of the drill bit and the drill body.

[0005] The distance between the first step and the second step from top to bottom of the drill bit is greater than the distance between the second step and the third step, and the distance between the second step and the third step and each step below is equal.

[0006] The opening angle of the top of the drill bit is 118°.

[0007] The chamfer between each layer of steps is 150°.

[0008] A limiting protrusion is arranged between the end of the drill body away from the drill bit and the handle.

[0009] The limiting protrusion includes a limiting protrusion A and a limiting protrusion B. The limiting protrusion A and the limiting protrusion B are transitioned through chamfering. The diameter of the limiting protrusion B is greater than the diameter of the limiting protrusion A.

[0010] The diameter of the limiting protrusion is larger than the diameter of the drill body and the handle.

[0011] The chip removal groove starts from the drill bit and ends at the limiting protrusion.

[0012] The chip removal groove is a double spiral chip removal groove.

[0013] The handle is a triangular handle or a hexagonal handle.

[0014] The utility model has the following beneficial effects: the utility model changes the traditional process of frequently replacing the drill bit, and the drill bit part is designed as a step style, which makes cutting easier, the processed hole accuracy is higher, and the accuracy of the thread can be better guaranteed; at the same time, the step drill bit can also calibrate the hole during the drilling process to avoid the problem of hole copper angle deviation; it can also ensure that the inner wall of the hole is smooth, so that the thread accuracy is guaranteed during the tapping process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of a step drill composite tap according to Example 1 of the utility model;

[0016] Figure 2 It is a schematic structural diagram of a drill bit of a step drill composite tap of Example 1;

[0017] Figure 3 It is a schematic structural diagram of the shank of the step drill composite tap of Example 1;

[0018] Figure 4 It is a schematic structural diagram of a step drill composite tap according to Embodiment 2 of the utility model;

[0019] Figure 5 This is a schematic structural diagram of the shank of the step drill composite tap of Example 2.

[0020] In the figure: 1. drill bit; 2. drill body A; 3. tap part; 4. drill body B; 5. chip groove; 6. limiting protrusion A; 7. limiting protrusion B; 8-1. triangular shank; 8-2. hexagonal shank. DETAILED DESCRIPTION

[0021] The utility model will be further described below in conjunction with the accompanying drawings and the accompanying description.

[0022] Example 1

[0023] A stepped drill composite tap, comprising a drill bit 1, a drill body and a shank, wherein the shank is a triangular shank 8-1; the drill bit 1 is composed of a plurality of steps with increasing diameters from top to bottom, and each layer of steps is connected by a chamfer transition; the chamfer between each layer of steps is 150°; the spacing between the first layer of steps and the second layer of steps from top to bottom of the drill bit 1 is greater than the spacing between the second layer of steps and the third layer of steps, and in this embodiment, the spacing is set to 3mm, and the spacing between the second layer of steps and the third layer of steps and each layer of steps below is equal, and in this embodiment, the spacing is set to 1.5mm; the opening angle at the top of the drill bit 1 is 118°;

[0024] The drill body is composed of a drill body A2, a tap part 3, a drill body B4 and a chip removal groove 5. The drill bit 1, the drill body A2, the tap part 3 and the drill body B4 are connected in sequence; the chip removal groove 5 is continuously arranged on the surface of the drill bit 1 and the drill body;

[0025] A limiting protrusion is provided between the end of the drill body away from the drill bit 1 and the handle; the limiting protrusion includes a limiting protrusion A6 and a limiting protrusion B7, the limiting protrusion A6 and the limiting protrusion B7 are transitioned by chamfering, and the diameter of the limiting protrusion B7 is larger than the diameter of the limiting protrusion A6; and larger than the diameter of the triangular handle 8-1;

[0026] The chip groove 5 is a double-helix chip groove, which starts from the drill bit 1 and ends at the limiting protrusion.

[0027] Example 2

[0028] A stepped drill composite tap, comprising a drill bit 1, a drill body and a shank, wherein the shank is a hexagonal shank 8-2; the drill bit 1 is composed of a plurality of steps with increasing diameters from top to bottom, and each layer of steps is connected by a chamfer transition; the chamfer between each layer of steps is 150°; the distance between the first layer of steps and the second layer of steps from top to bottom of the drill bit 1 is greater than the distance between the second layer of steps and the third layer of steps, and the distance between the second layer of steps and the third layer of steps and each layer of steps below is equal; the opening angle at the top of the drill bit 1 is 118°;

[0029] The drill body is composed of a drill body A2, a tap part 3, a drill body B4 and a chip removal groove 5. The drill bit 1, the drill body A2, the tap part 3 and the drill body B4 are connected in sequence; the chip removal groove 5 is continuously arranged on the surface of the drill bit 1 and the drill body;

[0030] A limiting protrusion is provided between the end of the drill body away from the drill bit 1 and the shank; the limiting protrusion includes a limiting protrusion A6 and a limiting protrusion B7, the limiting protrusion A6 and the limiting protrusion B7 are transitioned by chamfering, and the diameter of the limiting protrusion A7 is larger than the diameter of the limiting protrusion B6; and larger than the diameter of the hexagonal shank 8-2;

[0031] The chip removal groove 5 is a double spiral chip removal groove, which starts from the drill bit 1 and ends at the limiting protrusion;

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made to the above embodiment based on the technical essence of the present invention shall be included in the protection scope of the present invention.

Claims

1. A step drill composite tap, characterized in that: The drill bit (1) comprises a drill body and a shank, wherein the drill bit (1) is composed of a plurality of steps with increasing diameters from top to bottom, and each step is connected by a chamfer transition; the drill body is composed of a drill body A (2), a tap part (3), a drill body B (4) and a chip removal groove (5), and the drill bit (1), the drill body A (2), the tap part (3) and the drill body B (4) are connected in sequence; and the chip removal groove (5) is continuously arranged on the surfaces of the drill bit (1) and the drill body.

2. The step drill composite tap according to claim 1, characterized in that: The distance between the first step and the second step of the drill bit (1) from top to bottom is greater than the distance between the second step and the third step, and the distance between the second step and the third step and each step below is equal.

3. The step drill composite tap according to claim 1, characterized in that: The opening angle of the top of the drill bit (1) is 118°.

4. The step drill composite tap according to claim 1, characterized in that: The chamfer between each layer of steps is 150°.

5. The step drill composite tap according to claim 1, characterized in that: A limiting protrusion is provided between the end of the drill body away from the drill bit (1) and the shank.

6. The step drill composite tap according to claim 5, characterized in that: The limiting protrusion comprises a limiting protrusion A (6) and a limiting protrusion B (7). The limiting protrusion A (6) and the limiting protrusion B (7) are transitioned through chamfering, and the diameter of the limiting protrusion B (7) is larger than the diameter of the limiting protrusion A (6).

7. The step drill composite tap according to claim 5, characterized in that: The diameter of the limiting protrusion is larger than the diameter of the drill body and the handle.

8. The step drill composite tap according to claim 5, characterized in that: The chip removal groove (5) starts from the drill bit (1) and ends at the limiting protrusion.

9. The step drill composite tap according to claim 1, characterized in that: The chip removal groove (5) is a double-helix chip removal groove.

10. The step drill composite tap according to claim 1, characterized in that: The handle is a triangular handle (8-1) or a hexagonal handle (8-2).

Images