CN215468354U

CN215468354U - High-hardness four-edge round nose milling cutter

Info

Publication number: CN215468354U
Application number: CN202121217734.7U
Authority: CN
Inventors: 蒋叶; 杨小双; 夏富; 谢红锋; 恽鹏飞
Original assignee: Changzhou Kaituo Tools Co ltd
Current assignee: Changzhou Kaituo Tools Co ltd
Priority date: 2021-06-02
Filing date: 2021-06-02
Publication date: 2022-01-11
Anticipated expiration: 2031-06-02

Abstract

The utility model relates to the technical field of milling cutters, in particular to a high-hardness four-edge round nose milling cutter which comprises a cutter handle and a cutting part positioned at the front end of the cutter handle, wherein four spiral side blades protrude out of the outer peripheral surface of the cutting part, four spiral chip grooves are formed among the four side blades, the included angles occupied by the two adjacent chip grooves on the same plane are unequal, a plurality of end blades protrude out of the bottom surface of the cutting part, the end blades correspond to the side blades one to one, the joint of the end blades and the side blades are connected through a first arc surface, regular and periodic cutting force vibration is avoided through unequal distance arrangement of the side blades, the end blades are arranged on the bottom surface of the milling cutter, the cutting on the bottom surface of a hole position can be facilitated, the phenomenon that the first arc surface is excessively adopted between the extrusion side blades and the end blades of a hole position by the milling cutter is reduced, the chip cutting part is excessively smooth, and chip removal is facilitated.

Description

High-hardness four-edge round nose milling cutter

Technical Field

The utility model relates to the technical field of milling cutters, in particular to a high-hardness four-edge round nose milling cutter.

Background

A milling cutter is a rotating tool with one or more cutter teeth for milling. When in work, each cutter tooth cuts off the allowance of the workpiece in sequence and intermittently. In machining, a milling cutter is needed to mill end faces, inclined planes, grooves and step faces of different workpieces. The cutting edges of the existing milling cutter are arranged at equal intervals, so that tremor is aggravated, the milling cutter is prone to breaking, the quality of a machined surface is poor, the end part of the milling cutter adopts the spherical surface to shrink the cutting edges, extrusion is caused during cutting of objects, the resilience of a cutting hole after cutting is completed under the action of toughness is reduced, and the requirement for efficient machining cannot be met.

Disclosure of Invention

In order to overcome the defects of the existing milling cutter, the utility model provides a high-hardness four-edge round nose milling cutter.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the high-hardness four-blade round nose milling cutter comprises a cutter handle and a cutting part positioned at the front end of the cutter handle, wherein four spiral side blades are protruded on the outer peripheral surface of the cutting part, four spiral chip discharge grooves are formed between the side blades, the two adjacent chip discharge grooves on the same plane are not equal in occupied included angle, the two opposite chip discharge grooves on the same plane are equal in occupied included angle, a plurality of end blades which are obliquely arranged are protruded on the bottom surface of the cutting part, the end blades and the side blades correspond one to one, the joint of the end blades and the side blades is connected through a first arc surface, and the effective cutting points are irregularly distributed through unequal distance arrangement of the side blades, so that the concentration and the orderliness of cutting force are dispersed, the vibration of the regular periodic cutting force is avoided, and the end part is installed on the bottom surface of the milling cutter, the cutting chip on the hole site bottom surface can be convenient for, the extrusion of the milling cutter to the hole site is reduced, the cutting chip precision is improved, the first arc surface is adopted between the side cutting edge and the end cutting edge to be excessive, the cutting chip site is excessively smooth, waste materials generated on the hole site bottom surface are favorably discharged in a chip removal groove along the first arc surface, and the accumulation of the waste materials is reduced, so that the stability, the stability and the processing quality of milling are greatly improved.

In order to solve the defects of the impact resistance of the milling cutter and the cutting performance of the cutting edge, the front angle of the side cutting edge is alpha degrees, the back angle of the side cutting edge is beta degrees, the alpha degrees are smaller than the beta degrees, the impact resistance of the cutting edge can be increased by the front angle of the side cutting edge with a small angle, the back angle of the side cutting edge with a large angle can not only improve the strength of the back of the cutter, but also improve the cutting performance of the cutting edge.

In order to solve the problem of the smear metal and the chip removal of its bottom surface in milling cutter smear metal hole site, further include the tip cutting edge is crooked fan-shaped structure, the tip cutting edge is crescent to smear metal portion circumferencial direction by smear metal portion center, and completion that can be faster reduces the extrusion of milling cutter and the chip removal of being convenient for to the smear metal of smear metal hole site bottom surface.

In order to further improve chip removal space and chip removal intensity, further include the tip cutting edge is collected in smear metal portion tip middle part, just the side of being connected of tip cutting edge and smear metal portion is connected through the second arc surface.

In order to arrange the side cutting edges at unequal intervals reasonably, the cutting edge row further comprises four included angles occupied by the chip discharge grooves, wherein the included angles are 80 degrees, 100 degrees, 80 degrees and 100 degrees in sequence.

The utility model has the beneficial effects that: according to the high-hardness four-edge round nose milling cutter provided by the utility model, effective cutting points can be irregularly distributed through unequal distance arrangement of the side cutting edges, so that the concentration and the orderliness of cutting force are dispersed, regular periodic cutting force vibration and chip sticking are avoided, the chips on the bottom surface of the hole position can be conveniently cut by mounting the end cutting edge on the bottom surface of the milling cutter, the extrusion of the milling cutter on the hole position is reduced, the chip precision is improved, the first arc surface transition is adopted between the side cutting edge and the end cutting edge, the chip position is excessively smooth and strong in impact resistance, waste generated by the bottom surface of the hole position is favorably moved to a chip removal groove along the first arc surface to be discharged, the accumulation of the waste is reduced, and the stability, the stability and the processing quality of milling processing are greatly improved.

Drawings

The utility model is further illustrated with reference to the following figures and examples.

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

FIG. 2 is a schematic bottom view of the present invention;

fig. 3 is a schematic structural diagram of the present invention.

In the figure, the cutting part comprises a shank, a cutting part 2, a cutting part 3, a side cutting edge 4, a chip groove 5, an end cutting edge 6, a first arc surface 7 and a second arc surface.

Detailed Description

As shown in fig. 1, which is a schematic structural diagram of the present invention, a high-hardness four-blade round nose milling cutter comprises a cutter handle 1 and a cutting part 2 located at the front end of the cutter handle 1, wherein four spiral side blades 3 are protruded on the outer circumferential surface of the cutting part 2, four spiral chip discharge slots 4 are formed between the four side blades 3, the included angles occupied by the two adjacent chip discharge slots 4 on the same plane are unequal, the included angles occupied by the two opposite chip discharge slots 4 on the same plane are equal, a plurality of end blades 5 which are obliquely arranged are protruded on the bottom surface of the cutting part, the end blades 5 are in one-to-one correspondence with the side blades 3, the joints of the end blades 5 and the side blades 3 are connected through a first arc surface 6, and through the unequal distance arrangement of the side blades 3, the effective cutting points can be irregularly distributed, so as to disperse the concentration and the orderliness of cutting force, avoided regular periodic cutting force vibration and sticky bits, through at milling cutter bottom surface installation tip cutting edge 5, it is to the smear metal of hole site bottom surface to be convenient for, reduce milling cutter to the extrusion of hole site, improve the smear metal precision, it is excessive to adopt first arc surface 6 between side cutting edge 3 and the tip cutting edge 5, make the smear metal position excessively level and smooth, strong shock resistance, the waste material that does benefit to the hole site bottom surface production removes to discharging in chip groove 4 along first arc surface 6, thereby reduce piling up of waste material and increased substantially milling process's stability, stationarity and processingquality.

As shown in fig. 3, the rake angle of the side blade 3 is α °, the relief angle of the side blade 3 is β °, α ° is smaller than β °, and the rake angle of the side blade 3 having a small angle can increase the impact resistance of the edge, and the relief angle of the side blade 3 having a large angle can improve both the strength of the back of the blade and the chipping performance of the edge.

As shown in fig. 1 and 2, the end blade 5 has a curved fan-shaped structure, and the end blade 5 gradually increases from the center of the cutting part to the circumferential direction of the cutting part, so that the extrusion of the milling cutter for cutting chips on the bottom surface of the chip hole site and the chip removal are more rapidly completed.

As shown in fig. 2, the end blade 5 is collected in the middle of the end of the chip part, and the connecting side of the end blade 5 and the chip part is connected through the second arc surface 7, so that the chip removal space and the chip removal strength are further improved.

The included angles occupied by the four chip grooves 4 are sequentially 80 degrees, 100 degrees, 80 degrees and 100 degrees.

The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims

1. The utility model provides a high hard four-edge round nose milling cutter, includes handle of a knife (1) and is located smear metal portion (2) of handle of a knife (1) front end, characterized by, the protrusion has on the outer peripheral face of smear metal portion (2) is four spiral helicine side cutting edges (3), four are formed four between side cutting edge (3) and are spiral helicine chip groove (4), adjacent two of arranging on the coplanar the contained angle inequality that chip groove (4) occupy, relative two of arranging on the coplanar the contained angle that chip groove (4) occupy equals, smear metal portion bottom surface protrusion has a plurality of tip cutting edges (5) that are the slope and arrange, tip cutting edge (5) and side cutting edge (3) one-to-one, the department of meeting of tip cutting edge (5) and side cutting edge (3) is connected through first arc surface (6).

2. The high-hardness four-edged round nose milling cutter as claimed in claim 1, wherein the rake angle of the side cutting edges (3) is α °, the relief angle of the side cutting edges (3) is β °, and α ° is smaller than β °.

3. A high-hardness four-edged round nose milling cutter as claimed in claim 1, wherein the end cutting edges (5) have a curved fan-shaped configuration, the end cutting edges (5) increasing progressively from the center of the chip portion in the circumferential direction of the chip portion.

4. High-hardness four-edged round nose milling cutter according to claim 1, wherein the end cutting edge (5) converges in the middle of the end of the chip part, and the connecting side of the end cutting edge (5) and the chip part is connected by a second circular arc surface (7).

5. A high-hardness four-edged round nose milling cutter as claimed in claim 1, wherein the included angles occupied by the four flutes (4) are 80 °, 100 °, 80 ° and 100 ° in this order.