Blade and hole machining tool

Abstract

The utility model provides a blade and hole processing cutter relates to cutter technical field, the blade is equipped with chisel edge and drill tip, the drill tip is ladder-shaped and has at least two angles, the angle at the tip is smaller, chisel edge has chisel edge apex angle, chisel edge rake angle and chisel edge oblique angle, the angle range of chisel edge rake angle is 0-45 degrees, the angle range of chisel edge rake angle is 0-45 degrees, and the angle range of chisel edge oblique angle is 0-45 degrees. The stepped drill tip is arranged on the blade, so that the centering capacity is enhanced, the stability during drilling is improved, the service life of the cutter is prolonged, the axial force and torque are reduced, a good centering effect can be achieved under the condition of poor rigidity, chips can be better discharged during large feeding, meanwhile, accurate and stable centering is guaranteed, and the drill tip is matched with the chisel edge, the chisel edge vertex angle and the chisel edge front angle. The effects of reducing the axial cutting force and enhancing the stability during centering are achieved, so that a guide drill is not needed, and the problem that the machining efficiency is affected due to the fact that a tool needs to be replaced during drilling centering is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of tool technology, in particular to a blade and a hole processing tool. Background Art

[0002] The disposable tool drill with replaceable cutter head that replaces the ordinary twist drill in the existing market is divided into a shank and a blade. The blade adopts standard end tooth geometry, the cutting is relatively smooth, and the cutting resistance is medium. Under normal circumstances, the product has a good performance. However, when drilling a hole with an aspect ratio greater than 5D, it is generally necessary to drill a guide hole for centering before replacing the drill bit for drilling. The need to change the tool affects the processing efficiency. In response to the above defects, this application is proposed. Utility Model Content

[0003] The purpose of the utility model is to provide a blade and a hole processing tool. By improving the blade drill tip structure, it is possible to drill holes with a large aspect ratio without using a guide drill, thereby solving the problem of needing to drill a guide hole for centering before replacing the drill bit for drilling, which requires changing the tool and affects the processing efficiency.

[0004] In order to solve the above problems, the utility model provides a blade, which has a chisel edge of a certain width, a drill point and a chisel edge chip groove. The chisel edge can improve the centering force. The drill point is stepped and is provided with at least two angles, generally two to three angles, wherein the angle at the tip is smaller. This structure can greatly enhance the centering ability, increase the stability during drilling, improve the service life of the tool, reduce the axial force and torque, and have a good centering effect even under conditions of poor rigidity. It can better remove chips during large feed and ensure accurate and stable centering at the same time; the chisel edge has a chisel edge top angle, a chisel edge rake angle and a chisel edge bevel angle. The chisel edge top angle enhances the stability during centering. The center drill point has a V-shaped chisel edge grinding, which increases the chisel edge rake angle to 0~-45° and reduces the axial cutting force. The chisel edge chip groove is arranged close to the chisel edge, which can improve the chip removal ability, reduce the axial force and torque, and can better remove chips during large feed.

[0005] According to an embodiment of the present invention, the insert is further provided with an inner edge chip groove and a spiral chip groove, and the chisel edge chip groove, the inner edge chip groove and the spiral chip groove are connected in sequence.

[0006] Optionally, the chisel edge angle ranges from 100° to 175°.

[0007] Optionally, the two angle ranges of the top angle of the drill tip are 100°~145° and 150°~180°.

[0008] Optionally, the chisel edge bevel angle ranges from 40° to 80°.

[0009] According to an embodiment of the present invention, the depth of the spiral chip flute gradually decreases from the drill tip to the other end.

[0010] According to an embodiment of the present invention, the insert is provided with a circumferential cutting edge band.

[0011] Optionally, the circumferential cutting lands are provided in one or two groups.

[0012] A hole processing tool comprises the above-mentioned blade and a tool body, wherein the blade is detachably mounted on the tool body.

[0013] According to one embodiment of the present invention, the blade is provided with a center positioning column, a V-shaped positioning surface and a connecting structure for fixed installation with the blade body. The center positioning column can well position the blade on the blade body. The V-shaped positioning surface is symmetrically arranged on both sides, corresponding to the V-shaped mounting groove on the blade body, and can be self-centering and centered. The connecting structure is used for installation with the blade body, preferably a screw hole is arranged in the middle position of the blade, the center of which is perpendicular to the blade axis, which can be better fixed and clamped on the blade by screws.

[0014] The beneficial effect of the present invention is that by arranging a stepped drill tip on the blade, the centering ability is enhanced, the stability during drilling is increased, the service life of the tool is improved, the axial force and torque are reduced, and a good centering effect can be achieved under conditions of poor rigidity. Better chip removal can be achieved during large feeds, while accurate and stable centering is guaranteed. Combined with the setting of the chisel edge, the chisel edge top angle, and the chisel edge rake angle, the effect of reducing the axial cutting force and enhancing the stability during centering is achieved, thereby eliminating the need for a guide drill and avoiding the problem of the need to change the tool for drilling centering, which affects the processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 is the main view of the blade;

[0017] Figure 2 Schematic diagram of the chisel edge angle B;

[0018] Figure 3 is a top view of the blade;

[0019] Figure 4 for Figure 3 Cross-sectional view at AA in the middle;

[0020] Figure 5 Schematic diagram of the drill tip structure of the insert;

[0021] Figure 6 This is the axonometric drawing of the blade;

[0022] In the figure: center positioning cylinder 1; screw hole 2; circumferential cutting edge band 3; chisel edge rake angle 4; chisel edge chip groove 5; inner edge chip groove 6; V-shaped positioning surface 7; spiral chip groove 8; chisel edge top angle 9; chisel edge bevel angle 10; drill tip 11; chisel edge 12. DETAILED DESCRIPTION

[0023] The following description is intended only to disclose the present invention and to enable those skilled in the art to implement the present invention. The embodiments described below are provided for illustrative purposes only, and those skilled in the art will readily appreciate other obvious variations. The basic principles of the present invention as defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other solutions that do not depart from the spirit and scope of the present invention.

[0024] Example 1:

[0025] A hole processing tool comprises a tool body and a blade. The blade is detachably mounted on the tool body to form a rotary cutting tool with a replaceable tool head.

[0026] The blade includes a fixing position and a cutting position. The fixing position includes a center positioning column 1, a V-shaped positioning surface 7 and a screw hole 2, and the cutting position includes a drill tip and a chisel edge.

[0027] like Figure 1 The blade is provided with a central positioning column 1, a V-shaped positioning surface 7 and a connection structure for fixed installation with the blade body.

[0028] The center positioning column 1 is a cylinder arranged at the center position of the bottom of the blade, which is used to cooperate with the socket on the blade body to position the blade on the blade body.

[0029] The V-shaped positioning surfaces 7 are symmetrically arranged on both sides, corresponding to the V-shaped mounting grooves on the cutter body, and can be self-centered and centered.

[0030] The connection structure is a screw hole 2 set in the middle of the blade, the center of which is perpendicular to the axis of the blade, which can better fix the blade and clamp it on the cutter body using screws.

[0031] The insert has two vertex angles on the drill tip 11 of the standard insert to enhance the centering ability to ensure drilling stability and improve drilling efficiency: Figure 5 The drill tip adopts XR variable arc grinding drill tip, and the two angle ranges of the drill tip are A1: 100°~145° and A2: 150°~180°. This structure can greatly enhance the centering ability, increase the stability during drilling, improve the tool life, reduce the axial force and torque, and have a good centering effect under conditions of poor rigidity. It can better remove chips during large feed and ensure accurate and stable centering.

[0032] The blade has a chisel edge 12 of a certain width and a chisel edge chip groove 5. The chisel edge 12 can improve the centering force. Figures 2 to 4 The chisel edge has a chisel edge angle 9, a chisel edge rake angle 4 and a chisel edge bevel angle 10. The chisel edge angle 9 enhances the stability during centering. The center drill tip has a V-shaped chisel edge grinding, which increases the chisel edge rake angle γ in the angle range of 0~-45° and reduces the axial cutting force. The chisel edge chip groove 5 is set close to the chisel edge, which can improve the chip evacuation ability, reduce the axial force and torque, and can better evacuate chips at high feed.

[0033] The angle range of the chisel edge top angle 9B is: 100°~175°.

[0034] The angle range of the chisel blade bevel angle 10ψ is 40°~80°.

[0035] Optionally, new drill tip geometries are available for carbide and high-speed steel inserts.

[0036] The blade is also provided with an inner edge chip groove 6 and a spiral chip groove 8. The transverse edge chip groove 5, the inner edge chip groove 6 and the spiral chip groove 8 are connected in sequence to form a total chip groove. Two groups of total chip grooves are provided. The inclination angle of the inner edge chip groove 6 is smaller than that of the spiral chip groove 8 and the transverse edge chip groove 5; the depth of the spiral chip groove 8 gradually decreases from the drill tip to the other end, forming a chip groove with a variable core thickness, which can improve the smoothness of chip removal while taking into account the strength of the blade.

[0037] Using the insert with the new drill tip geometry, a hole can be drilled directly in one go at a depth of 8D-12D without the need for a pilot drill.

[0038] Example 2:

[0039] On the basis of Example 1, Figure 6 The blade is provided with a circumferential cutting edge band 3, and the circumferential cutting edge band 3 is provided in one group or two groups.

[0040] Those skilled in the art will appreciate that the embodiments of the present invention described above and shown in the accompanying drawings are intended only as examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and illustrated in the embodiments. Any variations and modifications may be made to the embodiments of the present invention without departing from the principles described.

Claims

1. A blade, characterized in that: The blade is provided with a chisel edge (12) and a drill tip (11), wherein the drill tip (11) is stepped and has at least two angles, wherein the angle at the tip is smaller, and the chisel edge (12) has a chisel edge top angle (9), a chisel edge rake angle (4), and a chisel edge bevel angle (10), wherein the chisel edge rake angle (4) has an angle range of 0° to -45°.

2. The blade according to claim 1, wherein: A chisel edge chip groove (5) is provided near the chisel edge (12) of the blade.

3. The blade according to claim 2, characterized in that: The blade is also provided with an inner edge chip groove (6) and a spiral chip groove (8), and the transverse edge chip groove (5), the inner edge chip groove (6) and the spiral chip groove (8) are connected in sequence.

4. The blade according to any one of claims 1 to 3, characterized in that: The angle range of the chisel edge top angle (9) is 100° to 175°.

5. The blade according to any one of claims 1 to 3, characterized in that: The two angle ranges of the top angle of the drill tip are 100°~145° and 150°~180°.

6. The blade according to any one of claims 1 to 3, characterized in that: The angle range of the chisel blade bevel angle (10) is 40° to 80°.

7. The blade according to claim 3, characterized in that: The depth of the spiral chip flute (8) gradually decreases from the drill tip to the other end.

8. The blade according to any one of claims 1 to 3 or 7, characterized in that: The blade is provided with a circumferential cutting edge band (3).

9. A hole machining tool, characterized in that: The utility model comprises a knife body and a blade according to any one of claims 1 to 8, wherein the blade is detachably mounted on the knife body.

10. The hole machining tool according to claim 9, characterized in that: The blade is provided with a central positioning column (1), a V-shaped positioning surface (7), and a connection structure for fixed installation with the blade body.

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