CN114472997A

CN114472997A - Milling cutter

Info

Publication number: CN114472997A
Application number: CN202210127837.7A
Authority: CN
Inventors: 李志尧; 赵卫娟; 张榅桲; 张海斌
Original assignee: Zhengzhou Diamond Precision Manufacturing Co Ltd
Current assignee: Zhengzhou Diamond Precision Manufacturing Co Ltd
Priority date: 2022-02-11
Filing date: 2022-02-11
Publication date: 2022-05-13

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

Milling cutter

Technical Field

The invention belongs to the technical field of cutter processing, and particularly relates to a milling cutter.

Background

In the existing workpiece processing of some ultra-precision industries, the finish machining adopts a scheme of hard alloy end milling cutter + coating, the roughness after processing can meet the requirements of customers, but the cutter is worn quickly, the service life of the cutter is too short, frequent cutter changing is needed, and the efficiency is too low, so that the small-diameter cutter made of the superhard material is a good choice, such as a micro milling cutter. When the micro milling cutter is used for processing a workpiece, the surface quality of the workpiece and the grinding service life of the cutter are influenced by basic characteristic parameters of the micro milling cutter, such as cutter material, blunt edge, structural angle and the like.

Therefore, the application provides a fine milling cutter that high accuracy, wearability are good.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a milling cutter which is used for solving the technical problems of high abrasion speed, short service life and low processing efficiency of the existing milling cutter.

In order to achieve the purpose, the technical scheme of the invention is as follows: a milling cutter comprises a cutter body and a cutter head which is 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, each cutting edge comprises a front cutter face, a first rear cutter face which is intersected with the front cutter face to form an edge part and a second rear cutter face which is connected with the first rear cutter face and is far away from the front cutter face, and the first rear angle of the peripheral edge of the first rear cutter face is smaller than the second rear angle of the peripheral edge of the second rear cutter face; 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 to form an anti-tipping structure; the edge part of the cutting edge is arranged on the cutter head in a high center manner; adjacent two on the tool bit be provided with the chip groove between the cutting edge, the chip groove is by one the first back knife face and the second back knife face of cutting edge and according to clockwise next the rake face of cutting edge surrounds and forms.

Preferably, the peripheral edge primary relief angle ranges from 10 ° to 20 °.

Preferably, the peripheral edge secondary relief angle ranges from 25 ° to 40 °.

Preferably, the chip grooves are arranged in a spiral mode, and the spiral angle is 30-45 degrees.

Preferably, the groove bottom of the chip groove is provided with two crossed V-shaped groove surfaces, and the opening of each V-shaped groove surface faces to the periphery of the tool bit.

Preferably, the protruding height range of the blade part arranged at the high center is 0.01-0.05 mm.

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

Preferably, the straight cutting edge forms an end edge near the end of the cutter head away from the cutter body, and the end edge is provided with a double relief angle.

Preferably, the double relief angle comprises an end edge first relief angle and an end edge second relief angle; the angle range of the first back angle of the end edge is 10-20 degrees, and the angle range of the second back angle of the end edge is 25-40 degrees.

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

The technical scheme adopted by the invention has the beneficial effects that:

according to the milling cutter, the plurality of cutting edges are uniformly arranged on the cutter head along the circumferential direction, the peripheral edge of each cutting edge is arranged in a double-relief angle mode, and the edge part of each cutting edge is arranged in a high center mode, so that the stress direction of the milling cutter is changed when the milling cutter works, the stress is uniform, and the surface quality required by a workpiece is conveniently achieved.

Drawings

FIG. 1 is a schematic front view of one embodiment of a milling cutter;

FIG. 2 is an enlarged view of the point A in FIG. 1;

FIG. 3 is a schematic end edge relief angle of the cutting edge of FIG. 2;

FIG. 4 is a schematic left side view of FIG. 2;

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

FIG. 6 is an enlarged view of the point B in FIG. 5;

fig. 7 is a left side view of fig. 5.

In fig. 1-7, 1-cutter body, 2-cutter head, 21-cutting edge, 211-rake face, 212-first relief face, 213-second relief face, 22-chip groove, 221-V-shaped groove face; r-nose fillet, R' -bulb radius, a 1-end edge first relief angle, a2 end edge second relief angle, b 1-peripheral edge first relief angle, b 2-peripheral edge second relief angle, and C-height center distance.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all embodiments, and do not limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The specific embodiment is as follows:

embodiment 1, as shown in fig. 1 to 7, a milling cutter comprises a cutter body 1 and a cutter head 2. The left end of the cutter body 1 is connected with the cutter head 2. In the embodiment, the cutter body 1 is made of hard alloy, and the cutter head 2 can be made of integral PCD, PCBN and ceramic materials; compared with the cutter with the coating added outside the hard alloy in the prior art, the integral PCD, PCBN or ceramic cutter head of the embodiment has the advantages that the feeding speed can be higher, the abrasion resistance of the blade part is higher, the service life of the cutter is longer, the replacement frequency of the cutter is lower, and the use range of the cutter is wider under the condition that the same surface roughness is ensured. After the tool bit 2 is worn in a period of use, the tool bit can be ground in a larger size due to the integral tool bit 2, and the use cost is greatly reduced.

In this embodiment, the one-piece cutting insert is attached to the cemented carbide body by sintering.

The left end of the cutting head 2 is provided with at least two cutting edges 21, which may be two, three or four. Specifically, the cutting edges 21 are uniformly arranged on the tip 2 in the circumferential direction of the tip 2. More specifically, the cutting edge 21 is constituted by a rake surface 211, a first flank surface 212, and a second flank surface 213. The rake surface 211 intersects the first relief surface 212 and forms an edge at the intersection. The second flank surface 213 is connected to the first flank surface 212 and is located on a side of the first flank surface 212 far from the rake surface 211.

More specifically, the included angle formed by the intersection of the rake face 211 and the edge is a rake angle, and the rake angles of the rake face in the axial direction and the radial direction are both set to be negative angles, so that the anti-tipping structure is formed, and the anti-tipping performance of the edge can be improved.

More specifically, the first flank surface 212 forms a peripheral edge first clearance angle b1 with the respective edge portion, the second flank surface forms a peripheral edge second clearance angle b2 with the respective edge portion, and b1 is smaller than b 2.

More specifically, the edge portion of the cutting edge 21 is convex leftward as compared to the center point position of the left end of the tool bit 2, i.e., the edge portion of the cutting edge 21 is disposed at the high center.

More specifically, the tool bit 2 is further provided with a chip removal groove 22, which facilitates chip removal after cutting and avoids surface roughness of a chip hard workpiece. A chip groove 22 is provided between each adjacent two cutting edges 21. In the clockwise direction, the first flank surface 212 and the second flank surface 213 of the preceding cutting edge 21 and the rake surface 211 of the succeeding cutting edge 21 surround each other to form a chip groove.

When the milling cutter is used, the cutter head 2 is of an integral type, is made of integral PCD, PCBN or ceramic materials and is connected with the cutter rod 1 in a sintering mode, so that compared with the milling cutter with a hard alloy cutter head and a coating, the milling cutter ensures the same surface roughness, has higher feeding speed, higher blade part abrasion resistance and longer service life, reduces the replacement frequency of the cutter and expands the application range. The cutting edge 21 of the cutting head 2 of the present embodiment has a peripheral double clearance angle, and the edge portion of the cutting edge 21 is disposed with a high center, which changes the stress direction of the tool, and the stress is uniform, thereby improving the strength of the cutting edge 21, and facilitating to achieve the surface quality required by the workpiece.

Further, the angle of the peripheral edge first relief angle b1 may be selected to be in the range of 10 ° -20 °. Accordingly, the angle of the peripheral edge secondary relief angle b2 may be selected to be in the range of 25 DEG to 40 deg.

Further, the flutes 22 are arranged in a spiral. Specifically, the selectable range of the spiral angle of the chip discharge groove 22 is 30-45 degrees, and the spiral angle is more favorable for discharging chips, so that the chips can be discharged more smoothly.

Further, two V-groove surfaces 221 are provided inside the chip groove 22. Specifically, the openings of the two V-groove surfaces 221 face the outer periphery of the tool bit 2; meanwhile, the two V-shaped groove surfaces 221 are arranged along the spiral direction of the chip groove 22 and partially intersect.

Furthermore, the high center of the cutting edge 21 is arranged, wherein the distance between the edge part of the cutting edge 21 and the center is recorded as a high center distance C, and the high center distance C is selected from 0.01-0.05 mm.

Embodiment 2, as shown in fig. 1 to 4, the cutting edge 21 is a straight edge as in the milling cutter according to embodiment 1. Specifically, the cutting edge 21 extends from the left end of the cutter head 2 near the center toward the outer peripheral edge of the cutter head 2 in a bent direction, and a rounded corner is provided at the bent position, which is recorded as a cutter point rounded corner R.

In the embodiment, the radius of the nose fillet R can be selected from 0.03 mm to 0.5mm to improve the strength of the cutting edge 21.

Further, the cutting edge 21 is also formed with an end edge near the left end of the tool bit 2. Specifically, the end edge of the cutting edge 21 is provided with a double relief angle, which is an end edge first relief angle a1 and an end edge second relief angle a 2.

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

Embodiment 3, as shown in fig. 5 to 7, the cutting edge 21 is an arc-shaped cutting edge as the milling cutter according to embodiment 1. Specifically, the cutting edge 21 extends from the left end of the tool bit 2 near the center to the peripheral edge of the tool bit 2 in the direction of a circular arc, and the left end of the tool bit 2 is made to be spherical-like as a whole, thereby forming the ball end mill. The ball head radius R' of the ball head milling cutter is selected within the range of 0.05-3 mm.

The invention is described above with reference to the accompanying drawings, it is obvious that the specific implementation of the invention is not limited by the above-mentioned manner, and it is within the scope of the invention to adopt various insubstantial modifications of the technical solution of the invention or to apply the concept and technical solution of the invention directly to other occasions without modification.

Claims

1. A milling cutter comprises a cutter body and a cutter head which is coaxially arranged at the end part of the cutter body and used for cutting, and is characterized in that at least two cutting edges which are uniformly arranged are arranged on the cutter head along the circumferential direction, each cutting edge comprises a front cutter face, a first rear cutter face which is intersected with the front cutter face to form an edge part, and a second rear cutter face which is connected with the first rear cutter face and is far away from the front cutter face, and a first peripheral edge clearance angle of the first rear cutter face is smaller than a second peripheral edge clearance angle of the second rear cutter face; 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 to form an anti-tipping structure; the edge part of the cutting edge is arranged on the cutter head in a high center manner; adjacent two on the tool bit be provided with the chip groove between the cutting edge, the chip groove is by one the first back knife face and the second back knife face of cutting edge and according to clockwise next the rake face of cutting edge surrounds and forms.

2. The milling cutter according to claim 1, wherein the peripheral edge first relief angle is in the range of 10 ° to 20 °.

3. The milling cutter according to claim 2, wherein the secondary relief angle of the peripheral edge ranges from 25 ° to 40 °.

4. The milling cutter according to claim 3, wherein the flutes are helically arranged at a helix angle of from 30 ° to 45 °.

5. Milling cutter tool according to claim 4, characterized in that the groove bottom of the chip groove is provided with two intersecting V-groove surfaces, the opening of which is directed towards the outer periphery of the tool head.

6. The milling cutter according to claim 5, wherein the high-center disposed edge portion has a protrusion height in the range of 0.01 to 0.05 mm.

7. The milling cutter according to any one of claims 1 to 6, wherein the cutting edge is a straight edge extending from a position near the center of the end of the insert toward the peripheral edge of the insert.

8. The milling cutter according to claim 7, wherein the straight cutting edge forms an end edge near the end of the insert remote from the cutter body, the end edge being provided with a double relief angle.

9. The milling cutter according to claim 8, wherein the double relief angle comprises an end edge first relief angle and an end edge second relief angle; the angle range of the first back angle of the end edge is 10-20 degrees, and the angle range of the second back angle of the end edge is 25-40 degrees.

10. The milling cutter according to any one of claims 1 to 6, wherein the cutting edge is an arc-shaped cutting edge extending from a position near the center of the end of the insert toward the outer peripheral edge of the insert.