TWM589600U - Improved structure of milling cutter - Google Patents

Abstract

This creation is an improved structure of a milling cutter, including a shank portion and a blade body extending outward from the shank portion, the blade body is provided with a cutting portion at the other end opposite to the shank portion, and the cutting portion includes at least two cutters A tip is formed at the center of the two tool tips, and a knife core is formed from the recess to the two tool tips, and a slanted surface is extended from each of the two knife tips to the outside, and the knife body has a plurality of blades diagonally staggered Face and a plurality of rows of grooves, the blade faces and the chip flutes penetrate the blade body and both ends extend to the two inclined planes of the shank and the cutting part, and one or more of the blade faces have a first A helix angle is different from a second helix angle of the other blade surface. By changing the angle of the first helix angle of a single blade surface, the milling cutter can reduce the clamping of the preset circuit when processing a preset circuit board The resonant amplitude of the machine on one of the boards can control the uniformity of drilling holes and improve the yield of drilling operations.

Description

Improved structure of milling cutter

This creation provides an improved structure of a milling cutter, in particular, one or more of the blade faces of a milling cutter has a first helix angle different from a second helix angle of other blade faces. The angle of the first helix angle is changed to reduce the resonant amplitude of the milling cutter and the machine holding the preset circuit board when processing a preset circuit board, so as to control the uniformity of drilling holes and improve the quality of drilling operations rate.

According to the current trend of electronic products towards light, thin and short design, the volume requirements of various electronic products have become smaller, so the manufacturing and processing of various electronic components inside electronic products will become more and more refined, and the The volume of the printed circuit board for setting the position of the electronic component group must also be reduced accordingly, so in the manufacturing process of the printed circuit board, most of them will use a drill or a micro milling cutter to perform hole processing, and can provide a plurality of pins of the electronic component after insertion It is then soldered to form an electrical connection.

In addition, in order to reduce the production cost of printed circuit boards, IC carrier boards, etc., multi-layer boards are simultaneously processed to match the miniaturization and arraying of electronic component structures, which promotes the continuous improvement of layout density and The number of layers is to meet the needs, so some manufacturers have developed high-density connection boards (HDI boards), which have the advantages of small size, fast speed and high frequency, and are widely used in personal computers (PC) and notebook computers (NB ), smartphone ( Smartphone) and personal digital assistant (PDA), and the demand for use has become more and more thin and light, so it also relatively improves the difficulty of the current milling cutter in drilling, the biggest problem is after drilling Around the holes, copper foils of different sizes may be turned out.

In order to reduce the axial force of axial drilling in general milling cutters, the core of the milling cutter is usually thin, and gradually thickens from the center of the circle, and the edge of the two blades is thick. The ability is very strong, it can be suitable for drilling operations, but because the thickness of the circuit board is getting thinner, when the circuit board is drilled with a conventional milling cutter, it is prone to resonance with the clamping machine of the circuit board, so it is impossible Controlling the uniformity of drilling holes leads to a decrease in the yield of drilling operations, which is the direction of research and improvement for those who need to work in this industry.

Therefore, in view of the problems and deficiencies of the above-mentioned practices, the creators collected relevant data, evaluated and considered by many parties, and used the years of research and development experience in this industry to continuously trial and modify. Patent was born.

The main purpose of this creation is that the milling cutter includes a shank portion and a blade body extending outward from the shank portion, the blade body is provided with a cutting portion at the other end relative to the shank portion, the cutting portion includes at least two tool tips, A concave portion is formed at the center of the two blade tips, a blade core is formed from the concave portion to the two blade tips, and an inclined surface is inclinedly extended to the outside of the two blade cores, the blade body has obliquely staggered plural blade surfaces and plural blade edges Layer grooves, the blade faces and the chip grooves extend through the blade body and both ends extend to the two inclined surfaces of the shank and the cutting part, and one or more of the blade faces have a first helix angle A second helix angle that is different from other blade faces, by changing the angle of the first helix angle of a single blade face, to reduce the milling cutter when processing a preset circuit board and clamping the preset The resonance amplitude of one of the circuit boards can control the uniformity of drilling holes and improve the yield of drilling operations.

The secondary purpose of this creation is that the absolute value of the first helix angle minus the second helix angle is less than 15 degrees.

Another purpose of this creation is that the second helix angle range is 20 degrees to 50 degrees.

1‧‧‧Cutter

11‧‧‧handle

12‧‧‧Blade

120‧‧‧Layer

121‧‧‧Face

13‧‧‧Cutting Department

131‧‧‧tip

132‧‧‧recess

133‧‧‧ Blade Heart

134‧‧‧Bevel

θ1‧‧‧The first helix angle

θ2‧‧‧Second helix angle

The first picture is a side view of the structure of the milling cutter.

The second picture is the structure diagram of the first and second helix angles around the cutting part of this creation.

In order to achieve the above purpose and effect, the technical means and structure used in this creation, the drawings and detailed description of the preferred embodiment of this creation, its structure and function are as follows, Poli fully understand.

Please refer to the first and second figures, which are the side structural diagrams of the original milling cutter and the first and second helix angles around the cutting part. It can be clearly seen from the figure that the original milling cutter 1 includes a shank portion 11, a blade body 12 and a cutting portion 13. The detailed explanations of each component are as follows: The milling cutter 1 includes a shank portion 11 and a blade body 12 extending outward from the shank portion 11, the blade body 12 A cutting portion 13 is provided at the other end opposite to the shank portion 11, the cutting portion 13 includes at least two tool tips 131, a recess 132 is formed at the center of the two tool tips 131, and each of the recesses to the two tool tips A knife core 133 is formed on the two knife cores 13 3 Each inclined outward extends a slope 134, the blade body 12 is obliquely staggered with a plurality of blade surfaces 121 and a plurality of rows of grooves 120 (this embodiment has seven blade surfaces 121 and seven rows of grooves 120, but not This self-limiting), the cutting surfaces 121 and the chip flutes 120 penetrate the blade body 12 and both ends extend to the two inclined surfaces 134 of the shank portion 11 and the cutting portion 13, and one of the cutting surfaces 121 or There is more than one second helical angle θ2 that is different from the other blade surfaces 121 by a first helical angle θ1. By changing the angle of the first helical angle θ1 of the single blade surface 121, the cutter 1 is reduced to a preset When drilling a circuit board (not shown in the figure), the resonance amplitude with a machine (not shown in the figure) that clamps the preset circuit board can control the uniformity of drilling holes and increase the yield of drilling operations.

One or more of the above-mentioned blade surfaces 121 has a first helix angle θ1 (one in this embodiment) different from a second helix angle θ2 (six in this embodiment) of the other blade surfaces 121. From the equation, it is θ1≠θ2, where the absolute value of the first helix angle θ1 minus the second helix angle θ2 is less than 15 degrees, which means that the first helix angle θ1 is greater than or less than the second helix angle θ2 . The second helix angle θ2 angle range is 20 degrees to 50 degrees. The angle range of the first and second helix angles (θ1, θ2) is the best embodiment of this creation.

The diameter of the above-mentioned milling cutter 1 can be a general type drill bit or a micro-milling cutter larger than 0.2 mm, and the shank portion 11 of the milling cutter 1 can be a straight or undercut type, which is combined with the blade body 12 It can be integrally formed or separately structured. Any simple modifications and equivalent structural changes made by using the content of this creation specification and drawings should be included in the scope of the patent of this creation, and it should be Chen Ming.

When the original milling cutter 1 is used in drilling operations, the cutter body 12 can be used as the end The second tip 131 at the part axially abuts on a predetermined circuit board surface, and the cutting part 13 is used for drilling, and the milling cutter 1 can pass through the center of the second tip 131 during the drilling process The concave portion 132 prevents the entire cutting portion 13 from directly contacting the surface of the preset circuit board to avoid the occurrence of inconsistent copper foil layer burrs (Burr) around the hole after drilling due to the force deformation of the preset circuit board Occurred, the chip removal groove 120 of the cutter body 12 assists rapid chip removal during drilling, and the hole can be formed after the milling cutter 1 passes through the preset circuit board, or the chip can be made by the concave portion 132 of the milling cutter 1 Will not pile up between the milling cutter 1 and the hole wall surface to scratch or block each other, thereby reducing the phenomenon of cracking or breaking of the milling cutter 1 during drilling operations, and ensuring that the quality of the drilled hole is better , Thereby extending the life of the milling cutter 1 as a whole.

Through the disclosure of the first picture to the second picture, it can be understood that the present invention provides an improved structure of a milling cutter, including a shank portion and a blade body extending outward from the shank portion, the blade body is opposite to the shank portion The other end is provided with a cutting portion, the cutting portion includes at least two tool tips, a recess is formed at the center of the two tool tips, a cutting core is formed from the recess to the two tool tips, and each of the two tool tips faces outward An oblique surface extends obliquely, the blade body has obliquely interleaved plural blade surfaces and plural rows of grooves, the blade surfaces and the chip discharge grooves penetrate the blade body and both ends extend to the two of the shank portion and the cutting portion Bevel, and one or more of these blade faces have a first helix angle that is different from other blade faces by a second helix angle, by changing the angle of the first helix angle of a single blade face to reduce the milling cutter at When processing a preset circuit board, the resonance amplitude with a machine holding the preset circuit board can control the uniformity of drilling holes and improve the yield of drilling operations. It has excellent practicability in the market of drilling tools, so a patent application is filed to seek the protection of patent rights.

The above detailed description is for the description of a preferred feasible embodiment of this creation, but this embodiment is not intended to limit the scope of the patent application of this creation. Equal changes and modifications made under the spirit of the skills disclosed in the work shall be included in the scope of patents covered by this creation.

In summary, the improved structure of the above-mentioned milling cutter can actually achieve its efficacy and purpose when it is used, so this creation is a new model with excellent practicality, which actually meets the requirements of the new patent application, and the application is submitted according to law I hope that the review committee will grant this case as soon as possible to protect the creator's hard work. If there is any doubt in the bureau, please send me a letter and give instructions. The creator will try his best to cooperate and feel virtuous.

1‧‧‧Cutter

11‧‧‧handle

12‧‧‧Blade

120‧‧‧Layer

121‧‧‧Face

13‧‧‧Cutting Department

131‧‧‧tip

132‧‧‧recess

133‧‧‧ Blade Heart

134‧‧‧Bevel

θ1‧‧‧The first helix angle

θ2‧‧‧Second helix angle

Claims (5)

An improved structure of a milling cutter includes a shank portion and a blade body extending outward from the shank portion, the blade body is provided with a cutting portion at the other end opposite to the shank portion, and the cutting portion includes at least two tool tips. A concave portion is formed at the center of the two blade tips, a blade core is formed from the concave portion to the two blade tips, and a slope is extended to the outside of the two blade cores, which is characterized in that the blade body has a plurality of blades arranged diagonally and staggered Face and a plurality of rows of grooves, the blade faces and the chip flutes penetrate the blade body and both ends extend to the two inclined planes of the shank and the cutting part, and one or more of the blade faces have a first A helix angle is different from a second helix angle of the other blade surface. By changing the angle of the first helix angle of a single blade surface, the milling cutter can reduce the clamping of the preset circuit when processing a preset circuit board The resonance amplitude of one of the boards. The improved structure of the milling cutter as described in item 1 of the patent application scope, wherein the absolute value of the first helix angle minus the second helix angle is less than 15 degrees. The improved structure of the milling cutter as described in item 1 of the patent application scope, wherein the second helix angle angle range is 20 degrees to 50 degrees. The improved structure of the milling cutter as described in item 1 of the patent application scope, wherein the diameter of the milling cutter is greater than 0.2 mm. The improved structure of the milling cutter as described in item 1 of the patent application, wherein the shank is a straight shank or undercut structure.

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