Positive and negative rose reamer for micro-hole machining

Abstract

The utility model relates to the technical field of cutters, in particular to a positive and negative chamfering cutter for processing micropores, which sequentially comprises a cutter handle, an upper cutter head and a lower cutter head which are coaxial and integrated from top to bottom, a positive cutting edge is arranged at the bottom end of the upper cutter head, a negative cutting edge is arranged at the top end of the lower cutter head, and a transition rod is arranged between the positive cutting edge and the negative cutting edge. The length of the transition rod is larger than the thickness of the workpiece. The outer diameter of the lower tool bit is smaller than the diameter of a micropore in the workpiece. Therefore, the upper tool bit and the lower tool bit are used for chamfering micro holes in a workpiece respectively, one working procedure is guaranteed, meanwhile, the overall service life is prolonged, and the overall machining cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of cutting tools, in particular to a positive and negative chamfering tool for micro-hole processing. Background Art

[0002] like Figure 1 The existing aluminum plate workpiece with a thickness of 4.5mm to 5mm is drilled with micro-holes with a diameter of 1mm to 1.5mm. Both ends of the micro-holes need to be chamfered. Traditionally, a T-shaped positive and negative chamfering tool is used for processing, such as a bidirectional chamfering tool provided by Chinese utility model patent CN217452437U, which includes a tool handle and a tool head, wherein the tool head includes a positive blade and a reverse blade, and can complete the chamfering process in one process. However, as the number of micro-holes chamfered by the tool head increases, the tool head is easy to reach the life limit and break, resulting in an increase in the number of uses of the tool and an increase in processing costs.

[0003] Therefore, it is urgent to carry out structural transformation on the existing T-shaped positive and negative chamfering cutter to extend the service life of the cutter. Utility Model Content

[0004] The purpose of the utility model is to overcome the defects and shortcomings in the prior art. To this end, the utility model provides a positive and negative chamfering tool for micro-hole processing, which can complete the chamfering process in one process while extending the service life of the tool and reducing the processing cost.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a positive and negative chamfering tool for micro-hole processing, which includes, from top to bottom, a coaxial and integrated tool handle, an upper tool head and a lower tool head, the bottom end of the upper tool head is provided with a positive blade, the top end of the lower tool head is provided with a reverse blade, a transition rod is provided between the positive blade and the reverse blade, the length of the transition rod is greater than the thickness of the workpiece, and the outer diameter of the lower tool head is smaller than the diameter of the micro-hole on the workpiece.

[0006] Furthermore, a tapered portion is provided at the transition between the knife handle and the upper knife head.

[0007] Furthermore, the angle between the forward blade and the central axis is 45°, and the angle between the reverse blade and the central axis is 45°.

[0008] Furthermore, the number of the forward blade and the number of the reverse blade are both three.

[0009] Furthermore, the difference between the diameter of the microhole on the workpiece and the outer diameter of the lower cutter head is 0.2 mm.

[0010] Furthermore, the length of the transition rod is 4.6 mm.

[0011] Furthermore, a transition chamfer is provided at the bottom of the lower cutter head.

[0012] Compared with the prior art, the beneficial effect of the utility model is that the upper and lower cutter heads which are coaxial and alternately arranged can respectively perform micro-hole processing on the workpiece, thereby extending the overall service life and reducing the cost of using the tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the existing workpiece.

[0014] Figure 2 It is a structural schematic diagram of the utility model.

[0015] Figure 3 It is a partial half-section schematic diagram of the utility model.

[0016] Figure 4 A diagram showing the use status of the present utility model.

[0017] Among them: 1. handle; 2. tapered part; 3. upper cutting head; 4. transition rod; 5. lower cutting head; 31. forward cutting edge; 51. reverse cutting edge. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0020] Example

[0021] See also Figure 2 and Figure 4The utility model provides a positive and negative chamfering tool for micro-hole processing, which includes, from top to bottom, a coaxial integrated tool handle 1, an upper tool head 3 and a lower tool head 5, a positive blade 31 is provided at the bottom end of the upper tool head 3, a reverse blade 51 is provided at the top end of the lower tool head 5, a transition rod 4 is provided between the positive blade 31 and the reverse blade 51, the length of the transition rod 4 is greater than the thickness of the workpiece, and the outer diameter of the lower tool head 5 is smaller than the diameter of the micro-hole on the workpiece.

[0022] A tapered portion 2 may be provided between the handle 1 and the upper cutter head 3 to improve the connection strength between the handle 1 and the upper cutter head 3 and increase the service life.

[0023] The included angle between the positive blade 31 and the central axis is 45°, and the included angle between the reverse blade 51 and the central axis is 45°, thereby performing 45° chamfering on the microholes on the workpiece.

[0024] Furthermore, the number of blades of the forward blade 31 and the reverse blade 51 is preferably three.

[0025] As an embodiment of the present invention, the difference between the diameter of the micro-hole on the workpiece and the outer diameter of the lower cutter head 5 is 0.2 mm, thereby ensuring the overall stability of the lower cutter head 5, while ensuring the use and further improving the service life.

[0026] like Figure 1 As shown, the existing red arrow thickness is 4.58mm, the length of the transition rod 4 is preferably 4.6mm, and the diameter of the transition rod 4 is preferably 0.6mm. The bottom of the lower cutter head 5 is provided with a transition chamfer to prevent the bottom end of the lower cutter head 5 from scratching the inner wall of the microhole on the workpiece, and the details are not repeated.

[0027] The utility model can be summarized in other specific forms that do not violate the spirit or main features of the utility model. Therefore, no matter from which point of view, the above embodiments of the utility model can only be regarded as an explanation of the utility model and cannot limit the utility model. The claims indicate the scope of the utility model, while the above description does not indicate the scope of the utility model. Therefore, any changes within the meaning and scope equivalent to the claims of the utility model should be considered to be included in the scope of the claims of the utility model.

Claims

1. A positive and negative chamfering tool for micro-hole processing, characterized in that: From top to bottom, the invention comprises a coaxial integrated tool handle (1), an upper tool head (3) and a lower tool head (5), the bottom end of the upper tool head (3) is provided with a forward blade (31), the top end of the lower tool head (5) is provided with a reverse blade (51), a transition rod (4) is provided between the forward blade (31) and the reverse blade (51), the length of the transition rod (4) is greater than the thickness of the workpiece, and the outer diameter of the lower tool head (5) is smaller than the diameter of the microhole on the workpiece.

2. The positive and negative chamfering tool for micro-hole machining according to claim 1, characterized in that: A tapered portion (2) is provided at the transition between the knife handle (1) and the upper knife head (3).

3. The positive and negative chamfering tool for micro-hole machining according to claim 2, characterized in that: The included angle between the forward blade (31) and the central axis is 45°, and the included angle between the reverse blade (51) and the central axis is 45°.

4. The positive and negative chamfering tool for micro-hole machining according to claim 3, characterized in that: The number of blades of the forward blade (31) and the reverse blade (51) are both three.

5. The positive and negative chamfering tool for micro-hole machining according to claim 1, characterized in that: The difference between the diameter of the microhole on the workpiece and the outer diameter of the lower cutter head (5) is 0.2 mm.

6. The positive and negative chamfering tool for micro-hole machining according to claim 5, characterized in that: The length of the transition rod (4) is 4.6 mm.

7. The positive and negative chamfering tool for micro-hole machining according to claim 1, characterized in that: The bottom of the lower cutter head (5) is provided with a transition chamfer.

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