CN114472997A - Milling cutter - Google Patents

Abstract

The invention belongs to the technical field of cutter processing, and particularly relates to a milling cutter which comprises a cutter body and a cutter head coaxially arranged at the end part of the cutter body and used for cutting, wherein at least two cutting edges which are uniformly arranged are arranged on the cutter head along the circumferential direction; front angles are arranged at the intersection of the front cutter face and the edge part along the axial direction and the radial direction, and the front angles are negative angles; the edge part of the cutting edge is arranged on the cutter head in a high center; a chip groove is arranged between two adjacent cutting edges on the cutter head, and the chip groove is formed by encircling a first rear cutter face and a second rear cutter face of one cutting edge and a front cutter face of the next cutting edge in the clockwise direction. The milling cutter is used for solving the technical problems of relatively quick abrasion, short service life and low processing efficiency of the existing milling cutter.

Description

a milling cutter

technical field

The invention belongs to the technical field of tool processing, in particular to a milling cutter.

Background technique

In the existing workpiece processing of some ultra-precision industries, the finishing adopts the cemented carbide end mill + coating scheme. Although the roughness after processing can meet the customer's requirements, the tool wears quickly and the tool life Too short, frequent tool changes are required, and efficiency is too low, so small-diameter tools with superhard materials are a good choice, such as micro-milling tools. When the micro-milling tool processes the workpiece, the surface quality of the workpiece and the tool grinding life are affected by the basic characteristic parameters of the micro-milling tool, such as the tool material, the blunt edge of the cutting edge, and the structural angle.

Therefore, the present application provides a fine milling cutter with high precision and good wear resistance.

SUMMARY OF THE INVENTION

Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a milling cutter, which is used to solve the technical problems of rapid wear, short service life and low processing efficiency of the current milling cutter.

In order to achieve the above purpose, the technical solution of the present invention is as follows: a milling cutter, which comprises a cutter body and a cutter head coaxially disposed at the end of the cutter body and used for cutting, wherein the cutter head is arranged in a circumferential direction. At least two uniformly arranged cutting edges are provided, and the cutting edges consist of a rake face, a first flank that intersects with the rake face to form an edge portion, and a first flank that connects with the first flank away from the front face. The second flank of the rake face is formed, and the first relief angle of the peripheral edge of the first flank is smaller than the second relief angle of the peripheral edge of the second flank; The rake angle is set along the axial direction and the radial direction at the intersection of the cutting edge, and the rake angle is a negative angle to form an anti-chipping structure; A chip flute is provided between the two adjacent cutting edges, and the chip flute is formed by the first flank and the second flank of one of the cutting edges and the next one in the clockwise direction. The rake face of the cutting edge is enclosed.

Preferably, the angle range of the first relief angle of the peripheral edge is 10°˜20°.

Preferably, the angle range of the second relief angle of the peripheral edge is 25°˜40°.

Preferably, the chip flutes are arranged in a helical manner, and the helical angle is 30°˜45°.

Preferably, the bottom of the chip flute is provided with two intersecting V-shaped groove surfaces, and the openings of the V-shaped groove surfaces face the outer circumference of the cutter head.

Preferably, the protruding height of the blade portion set at the high center is in the range of 0.01-0.05 mm.

Preferably, the cutting edge adopts a straight cutting edge extending from a position close to the center of the end of the cutter head to the outer peripheral edge of the cutter head.

Preferably, an end edge is formed at a position of the straight blade close to the end of the blade head away from the blade body, and the end blade is provided with a double relief angle.

Preferably, the double relief angle includes a first relief angle of the end blade and a second relief angle of the end blade; the angle range of the first relief angle of the end blade is 10°~20°, and the angle of the second relief angle of the end blade is in the range of 10° to 20°. The angle range is 25°~40°.

Preferably, the cutting edge adopts an arc-shaped cutting edge extending from a position close to the center of the end of the cutter head to the outer peripheral edge of the cutter head.

The beneficial effects of adopting the technical solution of the present invention are:

In the present invention, a plurality of cutting edges are evenly arranged on the cutter head along the circumferential direction, the circumferential edge of each cutting edge is set with double relief angles, and the cutting edge of the cutting edge is set with a high center, which makes the milling cutter suffer from high pressure during operation. The direction of the force is changed, and the force is uniform, which is convenient to achieve the surface quality required by the workpiece.

Description of drawings

1 is a schematic front view of an embodiment of a milling cutter;

Fig. 2 is the enlarged schematic diagram at A place in Fig. 1;

Fig. 3 is the schematic diagram of the end edge relief angle of the cutting edge in Fig. 2;

Fig. 4 is the left side view schematic diagram of Fig. 2;

5 is a schematic front view of another embodiment of a milling cutter;

Fig. 6 is the enlarged schematic diagram at B in Fig. 5;

FIG. 7 is a schematic left side view of FIG. 5 .

Among them, in Figure 1-7, 1-tool body, 2-tool head, 21-cutting edge, 211-rake face, 212-first flank face, 213-second flank face, 22-chip flute , 221-V groove surface; R-corner fillet, R'-ball head radius, a1-first relief angle of end edge, a2 second relief angle of end edge, b1-first relief angle of peripheral edge, b2- The second rear corner of the peripheral edge, C-high center distance.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The scope of the invention is not limited.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

Specific examples are as follows:

Embodiment 1, as shown in FIGS. 1-7 , is a milling cutter, which includes a cutter body 1 and a cutter head 2 . The left end of the cutter body 1 is connected to the cutter head 2 . In this embodiment, the cutter body 1 is made of cemented carbide, and the cutter head 2 can be made of integral PCD, PCBN, and ceramic materials; Integral PCD, PCBN or ceramic cutter head, while ensuring the same surface roughness, the feed rate can be higher, the wear resistance of the cutting edge is higher, the tool life is longer, the tool replacement frequency is lower, and the tool use wider range. After the cutter head 2 is worn for a period of time, since the cutter head 2 is an integral type, the cutter head can be reground in a larger size, which greatly reduces the use cost.

In this embodiment, the integral cutting head is connected with the cemented carbide cutting body by means of sintering.

The left end of the cutter head 2 is provided with at least two cutting edges 21, and may be provided with two, three or four cutting edges. Specifically, the cutting edges 21 are evenly arranged on the cutter head 2 along the circumferential direction of the cutter head 2 . More specifically, the cutting edge 21 includes a rake face 211 , a first flank face 212 and a second flank face 213 . The rake face 211 and the first flank face 212 intersect, and a blade portion is formed at the intersection. The second flank surface 213 is connected to the first flank surface 212 and is located on the side of the first flank surface 212 away from the rake surface 211 .

More specifically, the included angle formed by the intersection of the rake face 211 and the blade is a rake angle, and the rake angles of the rake face in the axial and radial directions are set as negative angles, thus forming an anti-chipping structure, which can improve the blade. anti-chipping performance.

More specifically, a peripheral edge first relief angle b1 is formed between the first flank surface 212 and the corresponding edge portion, and a peripheral edge second relief angle b2 is formed between the second flank surface and the corresponding edge portion, and b1 is smaller than b2.

More specifically, compared with the position of the center point of the left end of the cutter head 2 , the cutting edge portion of the cutting edge 21 protrudes to the left, that is, the cutting edge portion of the cutting edge 21 is arranged at a high center.

More specifically, the cutter head 2 is also provided with a chip removal groove 22, which facilitates chip removal after cutting and avoids the surface roughness of the chip hard workpiece. A chip flute 22 is provided between every two adjacent cutting edges 21 . In the clockwise direction, the first flank 212 and the second flank 213 of the preceding cutting edge 21 and the rake face 211 of the succeeding cutting edge 21 are enclosed to form a chip flute.

When a milling cutter in this embodiment is in use, the cutter head 2 is an integral style, made of an integral PCD, PCBN or ceramic material, and is connected to the cutter shank 1 by sintering, so that it is connected with the cemented carbide cutter head + Compared with the coated milling cutter, while ensuring the same surface roughness, the feed rate can be higher, the wear resistance of the cutting edge is higher, the tool life is longer, and the frequency of tool replacement is reduced, and the scope of application is expanded. . The cutting edge 21 on the cutter head 2 of this embodiment has a peripheral edge and double relief angle, and the cutting edge portion of the cutting edge 21 is set at a high center, which makes the force direction of the tool change, the force is uniform, and the strength of the cutting edge 21 is improved. , it is convenient to achieve the surface quality required by the workpiece.

Further, the optional range of the angle of the first relief angle b1 of the peripheral edge is 10°˜20°. Correspondingly, the angle of the second relief angle b2 of the peripheral edge can be selected in the range of 25° to 40°.

Further, the chip flutes 22 are helically arranged. Specifically, the helix angle of the chip flute 22 can be selected in the range of 30°˜45°, and a larger helix angle is more conducive to the discharge of chips, so as to make the chip discharge more fluent.

Further, two V-shaped groove surfaces 221 are also provided inside the chip flute 22 . Specifically, the openings of the two V-shaped groove surfaces 221 face the outer periphery of the cutter head 2 ; meanwhile, the two V-shaped groove surfaces 221 are arranged along the helical direction of the chip flute 22 and partially intersect.

Further, the high center of the cutting edge 21 is set, wherein the distance between the edge of the cutting edge 21 higher than the center is recorded as the high center distance C, and the high center distance C is selected between 0.01 and 0.05 mm.

Embodiment 2, as shown in Figures 1-4, is a milling cutter as described in Embodiment 1 above, and the cutting edge 21 is a straight blade. Specifically, the cutting edge 21 extends from the left end of the cutter head 2 near the center to the outer peripheral edge of the cutter head 2 in a bending direction, and a rounded corner is provided at the bending position, which is denoted as the corner R.

In this embodiment, the radius of the corner R of the cutting edge can be selected in the range of 0.03-0.5 mm, so as to improve the strength of the cutting edge 21 .

Further, an end edge is formed at the left end of the cutting edge 21 close to the cutter head 2 . Specifically, the end edges of the cutting edge 21 are provided with double relief angles, which are respectively a first relief angle a1 of the end blade and a second relief angle a2 of the end blade.

In this embodiment, the selectable range of the first relief angle a1 of the end blade is 10°˜20°, and the selectable range of the second relief angle a2 of the end blade is 25°˜40°.

Embodiment 3, as shown in FIGS. 5-7 , is a milling cutter as described in Embodiment 1 above, and the cutting edge 21 adopts an arc-shaped blade. Specifically, the cutting edge 21 extends from the left end of the cutter head 2 near the center to the outer peripheral edge of the cutter head 2 in a circular arc, so that the left end of the cutter head 2 presents a spherical shape as a whole, forming a ball end milling cutter. The selection range of the ball nose radius R' of the ball end mill is 0.05~3mm.

The present invention has been exemplarily described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above-mentioned methods, as long as various non-substantial improvements made by the technical solutions of the present invention are adopted, or the If the concept and technical solutions are directly applied to other occasions, they all fall within the protection scope of the present invention.

Claims (10)

1. A milling cutter comprising a cutter body and a cutter head coaxially arranged at the end of the cutter body and used for cutting, wherein the cutter head is provided with at least two uniform cutters along the circumferential direction. An array of cutting edges consisting of a rake face, a first flank that intersects the rake face to form an edge, and a second flank that joins the first flank away from the rake face The rake face is formed, the first relief angle of the peripheral edge of the first flank face is smaller than the second relief angle of the peripheral edge of the second flank face; at the intersection of the rake face and the blade portion along the axial direction The rake angle and the radial direction are set, and the rake angle is a negative angle to form an anti-chipping structure; the cutting edge of the cutting edge is set at a high center on the cutter head; two adjacent ones on the cutter head A chip flute is arranged between the cutting edges, and the chip flute consists of the first flank and the second flank of one of the cutting edges and the rake of the next cutting edge in the clockwise direction. Surrounded by faces. 2 . The milling cutter according to claim 1 , wherein the angle range of the first relief angle of the peripheral edge is 10° to 20°. 3 . 3 . The milling cutter according to claim 2 , wherein the angle of the second relief angle of the peripheral edge ranges from 25° to 40°. 4 . 4 . The milling cutter according to claim 3 , wherein the chip flutes are arranged in a helical manner, and the helical angle is 30° to 45°. 5 . 5 . The milling cutter according to claim 4 , wherein the bottom of the chip flute is provided with two intersecting V-shaped groove surfaces, and the opening of the V-shaped groove surface faces the cutter head. 6 . the periphery. 6 . The milling cutter according to claim 5 , wherein the protruding height of the blade portion set at the high center is 0.01 to 0.05 mm. 7 . 7. A milling cutter according to any one of claims 1-6, wherein the cutting edge adopts a straight line extending from a position close to the center of the end of the cutter head to the outer peripheral edge of the cutter head blade. 8 . The milling cutter according to claim 7 , wherein the straight cutting edge forms an end edge at a position close to the end of the cutter head and away from the cutter body, and the end edge is provided with a double relief angle. 9 . . 9 . The milling cutter according to claim 8 , wherein the double relief angle includes a first relief angle of the end blade and a second relief angle of the end blade; the angle range of the first relief angle of the end blade is 10°~20°, and the angle range of the second relief angle of the end blade is 25°~40°. 10. A milling cutter according to any one of claims 1-6, wherein the cutting edge adopts an arc extending from a position close to the center of the end of the cutter head to the outer peripheral edge of the cutter head shaped blade.

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