CN114559081A

CN114559081A - Tapered end milling cutter with gradually-changed helical angle

Info

Publication number: CN114559081A
Application number: CN202210316254.9A
Authority: CN
Inventors: 张为; 司博文
Original assignee: Harbin University of Science and Technology
Current assignee: Harbin University of Science and Technology
Priority date: 2022-03-29
Filing date: 2022-03-29
Publication date: 2022-05-31

Abstract

The invention discloses a tapered end milling cutter with a gradually changed helical angle, which comprises a cutter handle part and a milling cutter head, and the technical scheme is as follows: milling cutter head has certain tapering, is convenient for process rack, V-arrangement groove, taper hole isotructure, is equipped with a plurality of milling sword on milling cutter head, including four side edges and four bottom edges, be equipped with spiral chip groove between the side edge, its side edge adopts big spiral gradual change helix angle structure, the stability of cutter when milling can be guaranteed to big helix angle structure, gradual change helix angle structure, its helix is linear gradual change, and helix angle range of change is 40-45, is being close to bottom edge one end, and the helix angle adopts great 45, and great helix angle can strengthen the milling cutter blade sharpness, reduces the load that unit length milling sword bore, prolongs cutter life, and is being close to handle of a knife portion one end, and the helix angle adopts less 40, can strengthen the chip removal ability of milling cutter.

Description

Tapered end milling cutter with gradually-changed helical angle

Technical Field

The invention relates to the field of milling cutter design, in particular to a tapered end milling cutter with a gradually changed helical angle.

Background

Milling cutters are one of the most common machining tools at present. Along with the increasingly fierce market competition, the types of products are continuously increased, the requirements on milling cutters are also continuously increased, the milling cutters are different from machining grooves and step surfaces, the traditional common edge end milling cutter is not suitable for special machining occasions such as conical surface machining and die draft angle machining, and the tapered edge milling cutter is a more suitable method for solving the problem.

At present, most common taper milling cutters are equal-helix angle milling cutters, and when the helix angle of the taper milling cutters is larger, although the cutting edges can be sharper, the load born by the milling cutting edges in unit length can also be reduced, the chip removal effect is not good; when the helix angle is smaller, the milling cutter has better chip removal capability, but the milling capability is relatively insufficient.

Disclosure of Invention

The invention aims to solve the problems in the background art and provide an end mill with simple structure and good milling capability and chip removal capability for special processing occasions such as conical surface processing, die draft angle processing and the like.

The technical scheme of the invention is as follows:

the utility model provides a tapered end mill with gradually-changed helical angle, this end mill includes handle of a knife portion and mills the tool bit, it has certain tapering to mill the tool bit, is equipped with a plurality of milling sword on milling the tool bit, including four side edges and four end edges, be equipped with spiral chip groove between the side edge, its side edge adopts big spiral gradually-changed helical angle structure.

The conicity of the milling cutter head of the end milling cutter is 4: 15.

the helix angle of the end milling cutter large spiral gradual change helix angle structure is in the range of 40-45 degrees, the change mode is linear gradual change, the milling capacity and the chip removal capacity of the end milling cutter can be enhanced, and the milling stability in the machining process is enhanced.

The front angle of the side edge of the end mill is 8-12 degrees, the first relief angle is 12-15 degrees, and the second relief angle is 20-25 degrees, so that the structure can reduce the friction between the rear tool face and a workpiece, and reduce the milling force in the machining process.

The end face of the milling cutter head of the end milling cutter is provided with a first end face rear angle, a second end face rear angle and an axial wedge angle, the first end face rear angle is 3-5 degrees, the second end face rear angle is 10-20 degrees, the axial wedge angle is 1-5 degrees, the structure can enhance the sharpness of a bottom edge, and the friction between the end face and a workpiece is reduced.

The end mill side edge length does not exceed 2/5 the overall length of the tool.

In summary, the invention mainly has the following beneficial effects:

1) the milling cutter head is suitable for special processing occasions such as conical surface processing, die drawing slope processing and the like through the taper structure of the milling cutter head.

2) According to the milling cutter, the stability of the milling cutter can be ensured by the large spiral gradual change spiral angle structure through the large spiral gradual change spiral angle structure, the spiral line of the gradual change spiral angle structure is in linear gradual change, the change range of the spiral angle is 40-45 degrees, the spiral angle is larger than 45 degrees at one end close to the bottom edge, the sharpness of the cutting edge of the milling cutter can be enhanced by the larger spiral angle, the load born by the milling edge in unit length is reduced, the service life of the milling cutter is prolonged, and the chip removal capability of the milling cutter can be enhanced by the smaller 40 degrees at one end close to the cutter handle.

3) According to the invention, through the structures such as the first end surface back angle, the second end surface back angle and the axial wedge angle, the sharpness of the bottom edge is enhanced, the friction between the end surface and a workpiece is reduced, and the milling force in the machining process is reduced.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a top view of the present invention;

fig. 3 is a partially enlarged view of the present invention.

In the figure: 1. a shank portion; 2. milling a cutter head; 3. a side edge; 4. a bottom edge; 5. spiral chip grooves.

Detailed Description

Example 1

Referring to fig. 1-3, the tapered end mill with the gradually-changed helix angle comprises a cutter handle portion (1) and a milling cutter head (2), wherein the milling cutter head (2) has a certain taper, a plurality of milling edges are arranged on the milling cutter head (2), the milling cutter head comprises four side edges (3) and four bottom edges (4), a spiral chip discharge groove (5) is formed between the side edges, and the side edges (3) of the milling cutter head adopt a large spiral gradually-changed helix angle structure.

Referring to fig. 1, the large spiral gradual change helix angle structure of the milling cutter can ensure the stability of the milling cutter during milling, the gradual change helix angle structure has a linear gradual change helix, the helix angle change range is 40-45 degrees, the helix angle adopts a larger 45 degree near one end of the bottom edge (4), the sharpness of the cutting edge of the milling cutter can be enhanced by the larger helix angle, the load born by the milling edge in unit length is reduced, the service life of the milling cutter is prolonged, the helix angle adopts a smaller 40 degree near one end of the cutter handle part (1), and the chip removal capability of the milling cutter can be enhanced.

Referring to fig. 1, the taper of the milling cutter head (2) is 4: 15, the method is suitable for special processing occasions such as conical surface processing, die drawing slope processing and the like.

Referring to fig. 2, the rake angle of the side edge (3) of the milling cutter is 8-12 °, the first relief angle is 12-15 °, and the second relief angle is 20-25 °, so that the structure can reduce the friction between the flank face and the workpiece, and reduce the milling force during the machining process.

Referring to fig. 3, the end surface of the milling cutter head (2) has a first end surface relief angle, a second end surface relief angle and an axial wedge angle, wherein the first end surface relief angle is 3-5 degrees, the second end surface relief angle is 10-20 degrees, and the axial wedge angle is 1-5 degrees, so that the structure can enhance the sharpness of the bottom edge and reduce the friction between the end surface and the workpiece.

The invention is suitable for special processing occasions such as conical surface processing, die drawing inclination processing and the like, and through the structure of the large spiral gradient helical angle, the milling stability of the milling cutter in the processing process is improved, the sharpness of the cutting edge of the milling cutter is enhanced, the load born by the side edge in unit length is reduced, and meanwhile, the invention has good chip removal effect and prolongs the service life of the cutter; the contact area between the end face of the milling cutter and the workpiece is reduced through the structures such as the end face rear angle, the axial wedge angle and the like, so that the friction between the milling cutter and the workpiece is reduced, the milling force and the milling heat in the machining process are reduced, and the sharpness of the end face cutting edge is improved. In conclusion, when the invention is applied to special processing occasions such as conical surface processing, die drawing slope processing and the like, the vibration of the cutter in the processing process can be reduced, the milling force and the milling heat are reduced, the processing precision and the processing efficiency of the cutter are improved, and the service life of the cutter is prolonged.

Claims

1. A tapered end mill with a gradually changed helical angle comprises a tool shank and a milling tool bit, and is characterized in that: the milling cutter head has a certain taper, a plurality of milling edges are arranged on the milling cutter head, the milling cutter head comprises four side edges and four bottom edges, a spiral chip groove is arranged between the side edges, and the side edges of the milling cutter head are of a large spiral gradual change helical angle structure.

2. A progressive helix angle taper end mill according to claim 1, wherein: the conicity of the milling cutter head is 4: 15.

3. a progressive helix angle taper end mill according to claim 1, wherein: the helix angle of the large spiral gradual change helix angle structure is in a range of 40-45 degrees, the change mode is linear gradual change, and the structure can enhance the milling capacity and the chip removal capacity of the milling cutter and enhance the milling stability in the machining process.

4. A progressive helix angle taper end mill according to claim 1, wherein: the front angle of the side cutting edge is 8-12 degrees, the first back angle is 12-15 degrees, the second back angle is 20-25 degrees, and the structure can reduce the friction between the back cutting surface and a workpiece and reduce the milling force in the machining process.

5. A progressive helix angle taper end mill according to claim 1, wherein: the end face of the milling cutter head is provided with a first end face rear angle, a second end face rear angle and an axial wedge angle, the first end face rear angle is 3-5 degrees, the second end face rear angle is 10-20 degrees, the axial wedge angle is 1-5 degrees, the structure can enhance the sharpness of the bottom edge, and the friction between the end face and a workpiece is reduced.

6. A progressive helix angle taper end mill according to claim 1, wherein: the side edge length does not exceed 2/5 the overall length of the cutter.