CN216938603U

CN216938603U - Improved structure of milling cutter

Info

Publication number: CN216938603U
Application number: CN202123029824.6U
Authority: CN
Inventors: 钟任超; 陈清文
Original assignee: Shanghai Topoint Precision Technology Co
Current assignee: Shanghai Topoint Precision Technology Co
Priority date: 2021-12-03
Filing date: 2021-12-03
Publication date: 2022-07-12
Anticipated expiration: 2031-12-03

Abstract

The utility model relates to an improved structure of a milling cutter, which comprises a milling cutter, wherein the milling cutter is provided with a handle part, one side of the handle part is extended with a cutter body part, the other side of the cutter body part opposite to the handle part is provided with a cutting part, the cutting part comprises at least two cutter points, a concave part is formed in the center of the two cutter points, a cutter center is respectively formed from the concave part to the two cutter points, each of the two cutter centers is obliquely extended with an inclined surface, the cutter body part is provided with a plurality of cutting edges and a plurality of chip grooves which are obliquely and alternately arranged, the cutting edges and the chip grooves penetrate through the cutter body part, the two ends of the cutting edges extend to the two inclined surfaces of the handle part and the cutting part, the cutting edges are provided with a first height, the first height of one side of the cutting edges is higher, and the second height, the third height, the fourth height, the fifth height, the sixth height and the seventh height of the cutting edges are gradually decreased clockwise by taking the first height as the center Scrap is remained, and the qualification rate of the drilling operation is improved.

Description

Improved structure of milling cutter

Technical Field

The utility model relates to an improved structure of a milling cutter, in particular to an improved structure of a milling cutter, which has the advantages that one side of a plurality of edge surfaces has a first height with higher height, and a second height, a third height, a fourth height, a fifth height, a sixth height and a seventh height of the plurality of edge surfaces are gradually decreased clockwise by taking the first height with higher height as a center, the resonance amplitude generated by the milling cutter during the processing of a preset circuit board and a machine table clamping the preset circuit board is reduced by the gradual decrease of the heights of the plurality of edge surfaces, the effect of controlling unnecessary burrs and scraps not generated in the cutting process of the milling cutter is achieved by means of the construction, and the qualification rate of drilling operation is improved.

Background

Under the trend of light, thin, short and small electronic products, the volume requirements of various electronic products become smaller, so that the manufacturing process of various electronic components inside the electronic products becomes more and more precise, and the volume of the printed circuit board for electronic components to be positioned in the electronic products must be reduced, so that during the manufacturing process of the printed circuit board, a drill or a micro milling cutter is mostly used for hole processing, and a plurality of pins of the electronic components can be inserted and then welded to form electrical connection.

Furthermore, in order to reduce the production cost, the printed circuit board, the IC carrier and the like are processed simultaneously by using a plurality of stacked boards, so as to match the miniaturization and the array of the electronic component package, and the printed circuit board is continuously improved in layout density and layer number to meet the requirement, so that practitioners have developed a High Density Interconnect (HDI) board, which has the advantages of small volume, high speed and high frequency, and is widely used in Personal Computers (PC), notebook computers (NB), Smart phones (Smart phones) and Personal Digital Assistants (PDA), and the requirement of use tends to be more and more light and thin, so that the difficulty of the conventional milling cutter in drilling processing is relatively increased, and the biggest problem is that copper foils with different sizes are turned outwards around the holes after drilling processing.

Because the general milling cutter is designed to reduce the axial force of axial drilling, the cutter center of the milling cutter is usually very thin and gradually thickens from the center of a circle to the outside, and the edges of the two blades are thick, the rotary cutting capability of the milling cutter is enhanced, so that the milling cutter is suitable for drilling operation.

SUMMERY OF THE UTILITY MODEL

Therefore, in view of the above problems and deficiencies, the present inventors have collected relevant information, evaluated and considered in many ways, and tried and modified continuously by years of experience accumulated in the industry, and have devised a new type of pressing switch with dust-proof and noise-reducing functions.

In order to achieve the purpose, the utility model adopts the technical scheme that:

an improved structure of milling cutter comprises a milling cutter, wherein the milling cutter is provided with a handle part, one side of the handle part extends to form a cutter body part, the other side of the cutter body part opposite to the handle part is provided with a cutting part, the cutting part comprises two cutter points, a concave part is formed in the centers of the two cutter points, a cutter center is respectively formed from the concave part to the two cutter points, and each outer side of the two cutter centers is obliquely extended to form an inclined plane, and the structure is characterized in that:

the knife body part is provided with a plurality of cutting faces and a plurality of chip grooves which are obliquely and alternately arranged, the plurality of cutting faces and the plurality of chip grooves penetrate through the knife body part, two ends of the plurality of chip grooves extend to two inclined faces of the handle part and the cutting part, the plurality of cutting faces are provided with a first height which is higher than the height of one side of the plurality of cutting faces, and the plurality of cutting faces are provided with a second height, a third height, a fourth height, a fifth height, a sixth height and a seventh height which gradually decrease the height clockwise by taking the higher first height as a center, and a chip guide groove is arranged at the top end of the cutting face with the first height.

The improved structure of the milling cutter is characterized in that: the plurality of blade faces are provided with at least one first helical angle and at least one second helical angle different from the first helical angle, the absolute value of the first helical angle minus the second helical angle is less than 15 degrees, and the second helical angle is 20-60 degrees.

The improved structure of the milling cutter is characterized in that: the diameter of the milling cutter is larger than 0.2 mm.

The improved structure of the milling cutter is characterized in that: the shank is of straight shank or undercut construction.

The milling cutter can more stably process a preset circuit board by gradually decreasing the heights of the plurality of edge surfaces, can control the milling cutter not to generate redundant burrs and scraps in the cutting process by the construction, and improves the qualification rate of drilling operation.

Drawings

Fig. 1 is a side view structural view of a modified structure of the milling cutter of the present invention.

Fig. 2 is a structural diagram of the first and second heights of the cutting face formed by a section a-a' of the improved structure of the milling cutter of the present invention.

Fig. 3 is a structural view of the first and second helix angles provided around the cutting portion of the milling cutter of the present invention.

Description of reference numerals: 1-milling cutter; 11-a handle; 12-a blade body part; 120-chip groove; 121-a blade face; 1210-chip guide grooves; 13 a cutting part; 131-a knife tip; 132-a recess; 133-a cutter center; 134-inclined plane; θ 1 — a first helix angle; θ 2 — a second helix angle; h1 — first height; h2 — second height; h3-third height; h4-fourth height; h5-fifth height; h6-sixth height; h7-seventh height.

Detailed Description

Referring to fig. 1 to 3, which are a side view structural diagram of an improved milling cutter of the present invention, a structural diagram of a first and a second height of a blade face formed by a section a-a' and a structural diagram of a first and a second helix angle disposed at the periphery of a cutting portion, it can be clearly seen from the drawings that the improved milling cutter of the present invention mainly comprises a milling cutter 1, a shank 11, a shank 12 and a cutting portion 13, and the connection relationship of the above components is as follows:

the milling cutter 1 comprises a shank 11 and a cutter body 12 extending outwards from the shank 11, the cutter body 12 has a cutting part 13 opposite to the other side of the shank 11, the cutting part 13 comprises at least two cutting edges 131, a concave part 132 is formed at the center of the two cutting edges 131, a cutter center 133 is formed from the concave part 132 to the two cutting edges 131, and a bevel 134 obliquely extends outwards from each of the two cutter centers 133, wherein: the blade portion 12 has a plurality of cutting surfaces 121 and a plurality of chip grooves 120, which are obliquely and alternately disposed, and the plurality of cutting surfaces 121 and the plurality of chip grooves 120 penetrate through the blade portion 12, and both ends of the plurality of cutting surfaces 121 and the two inclined surfaces 134 of the shank portion 11 and the cutting portion 13 extend to the two inclined surfaces 134, and as shown in a first and a second height structure diagram of the cutting surfaces formed by a section a and a section a' of the second drawing, it can be clearly seen that the plurality of cutting surfaces 121 have a first height H1 with a higher height at one side thereof, and a second height H2, a third height H3, a fourth height H4, a fifth height H5, a sixth height H6 and a seventh height H7 which are gradually decreased from the first height H1 as a center, so that the milling cutter 1 is more stable when a predetermined circuit board (not shown in the figure) is processed by the plurality of cutting surfaces 121, and an auxiliary chip groove 1210 is disposed at a top end of the cutting surface 121 having the first height H1, so as to avoid the excess rough edges and scraps from obstructing the progress of the drilling operation.

As shown in the structural diagram of the cutting portion of fig. 3, it can be clearly seen that the plurality of cutting surfaces 121 have at least one first helix angle θ 1 and at least one second helix angle θ 2 different from the first helix angle, an absolute value of an angle obtained by subtracting the second helix angle θ 2 from the first helix angle θ 1 is less than 15 degrees, the second helix angle θ 2 is 20 degrees to 60 degrees, the diameter of the milling cutter 1 is greater than 0.2mm, and the shank 11 is a straight shank type or undercut type structure.

In practical applications, the milling cutter 1 is disposed on a predetermined machine, the predetermined circuit board is fixed by the machine for clamping the predetermined circuit board, the milling cutter 1 performs a cutting operation on the predetermined circuit board, and during the cutting operation, the plurality of cutting surfaces 121 disposed on the milling cutter 1 form the first height H1, the second height H2, the third height H3, the fourth height H4, the fifth height H5, the sixth height H6, and the seventh height H7 with decreasing heights due to different heights, and by virtue of the design of clockwise decreasing heights, the milling cutter 1 does not generate excessive burrs and debris when cutting the predetermined circuit board, and a chip guide 1210 capable of assisting chip removal is disposed at the top end of the cutting surface 121 at the first height H1, the chip guide 1210 can discharge the excessive burrs and debris generated carelessly, so as to avoid hindering the progress of the drilling operation, and the plural blade faces 121 on the milling cutter 1 have at least one first helix angle theta 1 and at least one second helix angle theta 2 different from the first helix angle, and the absolute value of the first helix angle theta 1 minus the second helix angle theta 2 is less than 15 degrees, and the second helix angle theta 2 is 20 degrees to 60 degrees, so that the milling cutter can effectively assist chip removal, and can also reduce the resonance amplitude generated by the milling cutter 1 when processing a preset circuit board and a machine table clamping the preset circuit board, thereby controlling the uniformity of drilling holes and improving the qualification rate of drilling operation, and having excellent practicability in the market of drilling processing tools.

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. An improved structure of milling cutter comprises a milling cutter, wherein the milling cutter is provided with a handle part, one side of the handle part extends to form a cutter body part, the other side of the cutter body part opposite to the handle part is provided with a cutting part, the cutting part comprises two cutter points, a concave part is formed in the centers of the two cutter points, a cutter center is respectively formed from the concave part to the two cutter points, and each outer side of the two cutter centers is obliquely extended to form an inclined plane, and the structure is characterized in that:

the knife body part is provided with a plurality of cutting surfaces and a plurality of chip grooves which are obliquely and alternately arranged, the plurality of cutting surfaces and the plurality of chip grooves penetrate through the knife body part, two ends of the plurality of chip grooves extend to two inclined surfaces of the handle part and the cutting part, the plurality of cutting surfaces are provided with a first height with a higher height on one side, and the plurality of cutting surfaces are provided with a second height, a third height, a fourth height, a fifth height, a sixth height and a seventh height which gradually decrease in height clockwise by taking the higher first height as a center, and a chip guide groove is arranged at the top end of the cutting surface with the first height.

2. The improved milling cutter structure of claim 1, wherein: the plurality of blade faces are provided with at least one first helical angle and at least one second helical angle different from the first helical angle, the absolute value of the first helical angle minus the second helical angle is less than 15 degrees, and the second helical angle is 20-60 degrees.

3. The improved milling cutter structure of claim 1, wherein: the diameter of the milling cutter is larger than 0.2 mm.

4. The improved milling cutter structure of claim 1, wherein: the shank is of straight shank or undercut construction.