A plunge milling cutter for machining sharp corners on CNC machine tools

Abstract

The present invention discloses a plunge milling cutter for machining sharp corners in CNC machine tools, comprising a cutter body provided integrally; the cutter body includes a clamping portion; an alignment portion provided on the clamping portion and coaxially arranged with the clamping portion; a cutting portion provided on the alignment portion, which includes a first cutting edge surface and a second cutting edge surface perpendicularly arranged on the alignment portion, a cutting tip angle provided at the connection of the first cutting edge surface and the second cutting edge surface, a first cutting edge provided at the top of the first cutting edge surface, a second cutting edge provided at the top of the second cutting edge surface, and a chip removal groove provided between the first cutting edge and the second cutting edge; the first cutting edge and the second cutting edge are perpendicularly arranged; the cutting tip angle is provided at the central position of the alignment portion and coaxially arranged with the center of the alignment portion. The cutting tip angle is coaxially arranged with the center of the alignment portion, which can quickly align the cutting tip angle position of the blind cavity, realize the plunge milling machining of blind cavities with different angles, and improve the efficiency and quality of sharp corner machining.

Description

Technical Field

[0001] The present invention belongs to the technical field of inserted milling cutters, and particularly relates to an inserted milling cutter for machining sharp corners in CNC machine tools. Background Art

[0002] Figure 1 There is a high-precision multi-cavity box-shaped structural part product. The material of this type of product is aluminum alloy plate 2A12-H112, which contains many small blind cavities that need sharp corners to be cleared. Generally, brittle ceramic chip electrical components are assembled in the blind cavities, and the transition fillet at the sharp corner of the blind cavity is generally required to be ≤R0.05.

[0003] For the sharp corner clearance of the blind cavities of this type of product, the electric discharge machining process is often used. The electric discharge machining process refers to the electro-corrosion effect through pulsed discharge between the tool electrode and the workpiece electrode in a certain medium to remove the surplus at the corner of the blind cavity. However, during the electric discharge machining process, due to the large surplus at the corner of the blind cavity, the wear of the sharp corner part of the electrode is also large, and it is extremely easy to cause ineffective sharp corner clearance at the corner of the blind cavity.

[0004] In addition, the electric discharge machining process is generally divided into rough machining (rapidly removing a large amount of surplus), manual pressing for sharp corner clearance, and finish machining. The machining steps are cumbersome and complex, the machining efficiency is extremely low, and the quality of the blind cavities machined by electric discharge machining is extremely unstable, and it is extremely easy to generate situations such as taper and unprocessed parts at the sharp corner. Summary of the Invention

[0005] The present invention aims to provide an inserted milling cutter for machining sharp corners in CNC machine tools to solve the problems in the above background art.

[0006] By using this inserted milling cutter, the cutting sharp corner position of the blind cavity can be quickly aligned, and the inserted milling machining of blind cavities with different angles can be realized to improve the sharp corner clearance quality.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] An inserted milling cutter for machining sharp corners in CNC machine tools, including a cutter body arranged integrally; the cutter body includes a clamping part;

[0009] An alignment part, arranged on the clamping part and coaxially arranged with the clamping part;

[0010] A cutting part, arranged on the alignment part, which includes a first cutting edge surface and a second cutting edge surface perpendicular to each other on the alignment part, a cutting sharp corner arranged at the connection of the first cutting edge surface and the second cutting edge surface, a first cutting edge arranged at the top of the first cutting edge surface, a second cutting edge arranged at the top of the second cutting edge surface, and a chip removal groove arranged between the first cutting edge and the second cutting edge; the first cutting edge and the second cutting edge are perpendicular to each other;

[0011] The cutting sharp corner is provided at the center position of the alignment part and is coaxially arranged with the center of the alignment part.

[0012] Preferably, a chamfer is provided in the length direction of the first cutting edge and the second cutting edge.

[0013] Preferably, the perpendicularity between the first cutting edge and the second cutting edge is not greater than 0.01 mm.

[0014] Preferably, the coaxiality between the cutting sharp corner and the alignment part is not greater than 0.02 mm.

[0015] Preferably, the cutting sharp corner is provided with a rounded corner, and the radius of the rounded corner is not greater than 0.05 mm.

[0016] Preferably, the chip removal groove includes a first inclined surface connected to the first cutting edge and a second inclined surface connected to the second cutting edge; and the first inclined surface and the second inclined surface are symmetrically arranged.

[0017] Preferably, the inclination angle range of the first inclined surface and the second inclined surface is 45 degrees - 60 degrees.

[0018] Preferably, the clamping part is integrally cylindrical; the cross-section of the alignment part is a rounded square.

[0019] Preferably, the material of the tool body is cemented carbide.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] A plunge milling cutter for chamfering in CNC machine tool processing in the present invention is used for plunge milling and chamfering of blind cavities in a CNC machining center machine tool. A cutting sharp corner is provided on the tool body, and the cutting sharp corner is used in cooperation with the cutting edge surface and the cutting edge, improving the quality of chamfering of blind cavities and avoiding damage during the chamfering of blind cavities; the cutting sharp corner is coaxially arranged with the center of the alignment part, and the cutting sharp corner position of the blind cavity can be quickly aligned, realizing plunge milling of blind cavities at different angles and improving the efficiency and quality of chamfering. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the specific embodiments of the present invention, the following will briefly introduce the drawings required for use in the description of the embodiments. Obviously, the following described drawings are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a structural schematic diagram of a multi-cavity box-shaped structural part product;

[0024] Figure 2Structural schematic diagram of a plunge milling cutter for corner cleaning in CNC machine tool processing according to the present invention;

[0025] Reference numerals: 1 - blind cavity, 2 - tool body, 3 - clamping part, 4 - alignment part, 5 - cutting part, 6 - first cutting edge surface, 7 - second cutting edge surface, 8 - cutting sharp angle, 9 - first cutting edge, 10 - second cutting edge, 11 - chip fluting, 12 - first inclined surface, 13 - second inclined surface. Detailed implementation manners

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. However, it should not be understood that the scope of the subject matter of the present invention is limited to the following embodiments. Without departing from the above technical ideas of the present invention, all modifications, substitutions, and changes made according to ordinary technical knowledge and conventional means in the art are included in the scope of the present invention.

[0027] Refer to Figure 2 , a plunge milling cutter for corner cleaning in CNC machine tool processing in the present invention, used for plunge milling in a CNC machining center machine tool Figure 1 at the corner cleaning position of the blind cavity 1 shown. The plunge milling cutter includes a tool body 2 provided integrally; the tool body 2 is made of cemented carbide. The tool body 2 includes a clamping part 3, an alignment part 4, and a cutting part 5 connected in sequence.

[0028] Specifically, the tool body 2 includes a clamping part 3. The overall shape of the clamping part 3 is cylindrical. In this embodiment, the diameter of the clamping part 3 is 10 mm and the length is 40 mm.

[0029] An alignment part 4 is provided on the top circular surface of the clamping part 3. The alignment part 4 is coaxially arranged with the clamping part 3, and the cross-section of the alignment part 4 is in the shape of a rounded square. In this embodiment, before the plunge milling cutter is processed, the alignment part 4 is a cylinder with a diameter of 12 mm and a length of 20 mm. A 10 mm × 10 mm square is drawn on the circular surface, and the side walls of the cylinder are cut along the four sides of the square, then the alignment part 4 with a cross-section of a rounded square is formed. The cross-section of the alignment part 4 is set as a rounded square, which is convenient for assisting the cutting part 5 to quickly align the position of the cutting sharp angle 8 of the blind cavity 1.

[0030] Cutting part 5, the cutting part 5 is arranged on the alignment part 4, which includes a first cutting edge surface 6 and a second cutting edge surface 7 arranged perpendicular to each other on the alignment part 4. The first cutting edge surface, the second cutting edge surface 7, and the alignment part 4 are perpendicular to each other pairwise, and the first cutting edge surface and the second cutting edge surface are respectively parallel to two opposite sides of the rounded square of the alignment part 4.

[0031] A cutting tip 8 is formed at the connection of the first cutting edge surface 6 and the second cutting edge surface 7 in the length direction. The cutting tip 8 is perpendicular to the center position of the alignment portion 4 and is coaxially arranged with the center of the alignment portion 4. The coaxiality between the cutting tip 8 and the alignment portion 4 is not greater than 0.02 mm. The cutting tip 8 in the present invention is arranged on the central axis of the alignment portion 4 and also on the central axis of the clamping portion 3. During machining, theoretically, the cutting tip 8 coincides with the corner clearance of the blind cavity 1. When the coaxiality deviation is large, the cutting tip 8 is necessarily deviated from the central axes of the alignment portion 4 and the clamping portion 3. During machining, if the deviation is too large, after corner clearance, it cannot be flush with the machined surface, and this deviation value needs to be adjusted and compensated manually to ensure the corner clearance quality. The cutting tip 8 is provided with a chamfered fillet in the length direction, and the radius of the chamfered fillet is not greater than 0.05 mm. Such a setting can make the cutting tip 8 sharp and ensure as little allowance as possible at the corner clearance.

[0032] A first cutting edge 9 is provided at the top of the first cutting edge surface 6, and a second cutting edge 10 is provided at the top of the second cutting edge surface 7. Here, the top refers to the end of the first cutting edge surface 6 and the second cutting edge surface 7 that is not connected to the alignment portion 4. The first cutting edge 9 and the second cutting edge 10 are perpendicularly arranged, and the perpendicularity between the first cutting edge 9 and the second cutting edge 10 is not greater than 0.01 mm. The corner clearance of the machined blind cavity 1 is a 90-degree right angle, which is directly formed by plunge milling on a machine tool. The mutually perpendicular first cutting edge 9 and second cutting edge 10 are required to ensure a 90-degree right angle after corner clearance. Therefore, it is required that the two cutting edges of the plunge milling cutter are perpendicular to each other and the perpendicularity is not greater than 0.01 mm. If they are not perpendicular, the corner clearance formed by plunge milling will not be 90 degrees, and after plunge milling, it cannot be flush with the machined contour surface. A chamfer is provided in the length direction of the first cutting edge 9 and the second cutting edge 10. As a preferred solution of this embodiment, the chamfer is inclined at 45 degrees. The chamfer can ensure that the tip of the cutting edge is sharp and the cutting is easy.

[0033] A chip removal groove 11 is provided between the first cutting edge 9 and the second cutting edge 10. The chip removal groove 11 includes a first inclined surface 12 connected to the first cutting edge 9 and a second inclined surface 13 connected to the second cutting edge 10. And the first inclined surface 12 and the second inclined surface 13 are symmetrically arranged. That is, the first inclined surface 12 and the second inclined surface 13 are inclined and symmetrically arranged to form the chip removal groove 11. The inclination angle range of the first inclined surface 12 and the second inclined surface 13 is 45 degrees - 60 degrees. In this embodiment, the inclination angle of the first inclined surface 12 and the second inclined surface 13 is 45 degrees. If the angle is too small, the edge is too thin and prone to chipping. If the angle is too large, the edge is relatively blunt and not conducive to cutting.

[0034] Using the plunge milling cutter of the present invention for machining such as Figure 1The box-shaped structural member shown, the product material of this structural member is aluminum alloy 2A12-H112, so the overall material of the tool body 2 in the present invention is preferably cemented carbide YG6. For Figure 1 The box-shaped structural member shown is subjected to plunge milling for corner cleaning, mainly relying on the cutting corner 8 in the present invention. During plunge milling, first, the plunge milling cutter is clamped on the spindle of the CNC machining center machine tool, and the alignment part 4 of the plunge milling cutter is used to align the position of the cutting corner 8 of the blind cavity 1 by using the machine tool spindle rotation and locking command; then the corner cleaning at a fixed position is processed through the cutting part 5; when this plunge milling process is completed, the spindle angle is rotated and locked, and the corner cleaning at other angles is plunge milled.

[0035] The plunge milling cutter of the present invention is used for plunge milling and corner cleaning of the blind cavity 1 on the CNC machining center machine tool. A cutting corner 8 is provided on the tool body 2, and this cutting corner is used in cooperation with the cutting edge surface and the cutting edge, improving the corner cleaning quality of the blind cavity 1 and avoiding damage during the corner cleaning process of the blind cavity 1; the cutting corner 8 is coaxially arranged with the center of the alignment part 4, which can quickly align the position of the cutting corner 8 of the blind cavity 1, realize plunge milling of the blind cavity 1 at different angles, and improve the efficiency and quality of corner cleaning.

[0036] The above has introduced in detail a plunge milling cutter for corner cleaning in CNC machine tool processing provided by the present invention. Specific examples are used in this article to elaborate on the structure and working principle of the present invention. The description of the above embodiments is only used to help understand the method and core idea of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An interpolation milling cutter for machining sharp corners on CNC machine tools, characterized in that: It includes a tool body (2) provided integrally; the tool body (2) includes a clamping portion (3); An alignment portion (4) is provided on the clamping portion (3) and is coaxially arranged with the clamping portion (3); A cutting portion (5) is provided on the alignment portion (4), which includes a first cutting edge surface (6) and a second cutting edge surface (7) perpendicularly arranged on the alignment portion (4), a cutting tip (8) arranged at the connection of the first cutting edge surface (6) and the second cutting edge surface (7), a first cutting edge (9) arranged at the top of the first cutting edge surface (6), a second cutting edge (10) arranged at the top of the second cutting edge surface (7), and a chip groove (11) arranged between the first cutting edge (9) and the second cutting edge (10); the first cutting edge (9) and the second cutting edge (10) are perpendicularly arranged; The cutting tip (8) is arranged at the central position of the alignment portion (4) and is coaxially arranged with the center of the alignment portion (4); A chamfer is provided in the length direction of the first cutting edge (9) and the second cutting edge (10); The coaxiality between the cutting tip (8) and the alignment portion (4) is not greater than 0.02 mm.

2. The plunge milling cutter for corner cleaning in CNC machine tool machining according to claim 1, wherein: The perpendicularity between the first cutting edge (9) and the second cutting edge (10) is not greater than 0.01 mm.

3. The insert milling cutter for corner cleaning in CNC machine tool machining according to claim 1, wherein: The cutting tip (8) is provided with a rounded corner, and the radius of the rounded corner is not greater than 0.05 mm.

4. A plunge milling cutter for machining a fillet in a CNC machine tool according to claim 1, characterized in that: The chip groove (11) includes a first inclined surface (12) connected to the first cutting edge (9) and a second inclined surface (13) connected to the second cutting edge (10); and the first inclined surface (12) and the second inclined surface (13) are symmetrically arranged.

5. The plunge milling cutter for CNC machine tool machining corner cleaning according to claim 4, wherein: The inclination angle range of the first inclined surface (12) and the second inclined surface (13) is 45 degrees - 60 degrees.

6. A plunge milling cutter for chamfering in CNC machine tool machining according to any one of claims 1-5, characterized in that: The whole of the clamping portion (3) is cylindrically arranged; the cross-section of the alignment portion (4) is rounded square.

7. A plunge milling cutter for CNC machine tool machining of corner cleaning according to any one of claims 1-5, characterized in that: The material of the tool body (2) is cemented carbide.

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