CN215824352U

CN215824352U - Blind-fishing double-edge milling cutter

Info

Publication number: CN215824352U
Application number: CN202121910382.3U
Authority: CN
Inventors: 刘吉庆; 陈�光; 俞建星
Original assignee: Jinzhou Jinggong Technology Kunshan Co ltd
Current assignee: Jinzhou Jinggong Technology Kunshan Co ltd
Priority date: 2021-08-16
Filing date: 2021-08-16
Publication date: 2022-02-15
Anticipated expiration: 2031-08-16

Abstract

The utility model discloses a blind fishing double-edge milling cutter which comprises a clamping part and a cutting part, wherein the clamping part is positioned at the rear end, the cutting part is positioned at the front end, one end face of the cutting part, which is far away from the clamping part, is a drill tip part, the cutting part is provided with a pair of spiral chip grooves to the drill tip part, so that a main cutting edge and an auxiliary cutting edge are formed on the drill tip part, the central sharp angle of the drill tip part is a flat angle, and meanwhile, an arc-shaped third cutting edge is arranged at the junction of the chip grooves (21) and the drill tip part. The utility model adopts the straight angle to arrange the sharp angle, ensures that the fishing plane is smooth, increases the cutting sharpness by arranging the third cutting edge, avoids the burr phenomenon, ensures the cutting force by arranging the large front angle, is convenient for cutting products, increases the back grinding and ensures the dust exhaust performance.

Description

Blind-fishing double-edge milling cutter

Technical Field

The utility model relates to a milling cutter, in particular to a blind-fishing double-edge milling cutter.

Background

Along with the development of the PCB industry, the product design is diversified, part of the product design requires blind groove processing, the blind groove requirements are unique, firstly, the groove bottom is required to be flat and has clear requirements on the depth, most of the blind grooves are used for plug-ins, secondly, the groove is required to be smooth, the groove edge has no burr problem, and thirdly, the size requirement is strict. The existing milling cutter can not meet the requirements, and a new milling cutter needs to be designed urgently.

Disclosure of Invention

In order to meet the requirements, the utility model provides a blind-fishing double-edge milling cutter.

The technical scheme adopted by the utility model for solving the technical problem is as follows: the utility model provides a blind double-edged milling cutter that drags for, is including the clamping part that is located the rear end and the cutting part that is located the front end, cutting part keep away from clamping part's an terminal surface is drill point portion, be equipped with a pair of spiral flute extremely on the cutting part drill point portion makes be formed with main cutting edge and vice cutting edge on the drill point portion, the central closed angle of drill point portion is the straight angle, is in simultaneously the flute with the juncture of drill point portion sets up curved third cutting edge.

As a further improvement of the utility model, the flutes are formed by flutes having a helix angle of 20 ° to 40 °.

As a further improvement of the present invention, a ground back is formed on a portion between a pair of chip flutes of the cutting portion.

As a further development of the utility model, the rake angle of the main cutting edge is 5 ° to 20 °.

As a further development of the utility model, the diameter of the cutting portion is 0.3 to 3.175 mm.

As a further development of the utility model, the diameter of the clamping portion is 3.175 mm.

The utility model has the beneficial effects that: the utility model adopts the straight angle to arrange the sharp angle, ensures that the fishing plane is smooth, increases the cutting sharpness by arranging the third cutting edge, avoids the burr phenomenon, ensures the cutting force by arranging the large front angle, is convenient for cutting products, increases the back grinding and ensures the dust exhaust performance.

Drawings

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

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

fig. 3 is a schematic view of the structure of the drilling tip part of the present invention.

The following description is made with reference to the accompanying drawings:

1-a clamping portion; 2-a cutting portion;

3-drilling a tip part; 31-center tip angle;

4-main cutting edge; 5-secondary cutting edge;

6-third cutting edge; 7, grinding the back;

21-chip groove; 8-front angle.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1-3, the blind-fishing double-edge milling cutter according to the present invention includes a clamping portion 1 at a rear end and a cutting portion 2 at a front end, wherein an end surface of the cutting portion 2 away from the clamping portion 1 is a drill tip portion 3, the cutting portion 2 is provided with a pair of spiral flutes 21 having a helix angle of 20 ° to 40 ° to the drill tip portion 3, such that a main cutting edge 4 and a sub cutting edge 5 are formed on the drill tip portion 3, and a ground back 7 is formed on a portion between the pair of flutes 21.

Referring to fig. 1-2, the main innovation of the present invention is to set the central point 31 of the drill tip 3 at 180 °, an absolute straight angle, without tolerance, in order to ensure the flatness of the groove bottom when machining blind grooves. Meanwhile, the arc-shaped third cutting edge 6 is arranged at the junction of the chip groove 21 and the drill tip part 3, so that smooth cutting and no burr generation are ensured, and the defect of cutting force reduction caused by too flat center sharp angle is overcome.

Referring to fig. 3, the present invention is designed with a large rake angle 8, the rake angle 8 of the main cutting edge being 5 ° to 20 °.

In addition, the milling cutter is made of high-cobalt-content hard alloy materials, wherein the diameter of the cutting part is 0.3-3.175 mm, and the diameter of the clamping part is 3.175 mm.

Therefore, the sharp angle is arranged at the straight angle, so that the fishing plane is ensured to be flat, the cutting sharpness is increased due to the arrangement of the third cutting edge, the burr phenomenon is avoided, the cutting force is ensured due to the large front angle, the product cutting is facilitated, the back grinding is increased, and the dust exhaust performance is ensured.

In the previous description, numerous specific details were set forth in order to provide a thorough understanding of the present invention. The foregoing description is only a preferred embodiment of the utility model, which can be embodied in many different forms than described herein, and therefore the utility model is not limited to the specific embodiments disclosed above. And that those skilled in the art may, using the methods and techniques disclosed above, make numerous possible variations and modifications to the disclosed embodiments, or modify equivalents thereof, without departing from the scope of the claimed embodiments. Any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the scope of the technical solution of the present invention.

Claims

1. The utility model provides a blind two sword milling cutters of dragging for, is including clamping part (1) that is located the rear end and cutting part (2) that are located the front end, cutting part (2) are kept away from a terminal surface of clamping part (1) is drill tip portion (3), it extremely to be equipped with a pair of spiral flute (21) on cutting part (2) drill tip portion (3), makes be formed with main cutting edge (4) and vice cutting edge (5) on drill tip portion (3), its characterized in that: the center closed angle (31) of the drilling tip part (3) is a straight angle, and the chip groove (21) and the junction of the drilling tip part (3) are provided with an arc-shaped third cutting edge (6).

2. The blind drag double-edged milling cutter as defined in claim 1, wherein: the chip grooves (21) are formed by grooves with a helical angle of 20-40 degrees.

3. The blind drag double-edged milling cutter as defined in claim 1, wherein: a grinding back (7) is formed on a part between a pair of chip grooves (21) of the cutting part (2).

4. The blind drag double-edged milling cutter as defined in claim 1, wherein: the rake angle (8) of the main cutting edge is 5 DEG to 20 deg.

5. The blind drag double-edged milling cutter as defined in claim 1, wherein: the diameter of the cutting portion is 0.3 to 3.175 mm.

6. The blind drag double-edged milling cutter as defined in claim 1, wherein: the diameter of the clamping portion was 3.175 mm.