CN210702764U - Improved milling cutter - Google Patents

Abstract

The utility model discloses an improvement type milling cutter, it includes a stalk portion and by the outside blade that extends of this stalk portion, the blade be for the other end of stalk portion is equipped with a cutting portion, cutting portion includes two at least knife tips, forms a concave part in the center department of two adjacent knife tips the concave part respectively is formed with a knife core to these two knife tips, and the slope of each outside of these two knife cores extends has an inclined plane, be equipped with a plurality of cutting surface and a plurality of chip groove on the blade obliquely crisscross, these cutting surface and these chip groove run through blade and both ends extend to the stalk portion with two inclined planes of cutting portion are equipped with first helix angle on one of them cutting surface, are equipped with the second helix angle on at least one cutting surface in other several cutting surfaces different in this cutting surface. The utility model discloses can reduce milling cutter add man-hour to the circuit board with the board resonance amplitude of this circuit of centre gripping, reach the homogeneity of control drilling hole to promote the yields of drilling operation.

Description

Improved milling cutter

Technical Field

The utility model relates to a milling cutter, concretely relates to improvement type milling cutter.

Background

Under the trend of light, thin, short and small electronic products, the volume requirements of various electronic products become smaller, so the manufacturing process of various electronic components inside the electronic products becomes more and more precise, and the volume of the printed circuit board capable of being assembled and positioned by the electronic components in the electronic products must be reduced, so that in the process of manufacturing 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 all processed by using a plurality of laminated boards simultaneously, so as to match with the miniaturization and the digitization of the electronic component package, so that the printed circuit board is also continuously improved in layout density and layer number to meet the requirements, and therefore, manufacturers develop high density connection boards (HDI boards), which have the advantages of small size, high speed and high frequency, are widely used in Personal Computers (PCs), notebook computers (NBs), smart phones (smartphones) and Personal Digital Assistants (PDAs), and have the trend of being lighter and thinner in use, so that the difficulty of the conventional milling cutter in drilling processing is relatively improved, and the biggest problem is that copper foils with different sizes are turned outwards around holes after drilling processing.

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

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve above-mentioned problem to an improvement type milling cutter is provided.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

the improved milling cutter comprises a shank and a cutter body extending outwards from the shank, wherein the cutter body is provided with a cutting part at the other end opposite to the shank, the cutting part comprises at least two cutter points, a concave part is formed in the center of each two adjacent cutter points, a cutter center is formed in each of the concave part and the two cutter points, each of the two cutter centers is obliquely extended to the outer side and provided with an inclined surface, the cutter body is obliquely and alternately provided with a plurality of blade surfaces and a plurality of chip grooves, the blade surfaces and the chip grooves penetrate through the cutter body, two inclined surfaces extending to the shank and the cutting part are formed at two ends of the cutter body, a first spiral angle is arranged on one blade surface, and a second spiral angle is arranged on at least one blade surface of the other blade surfaces different from the blade surfaces.

In a preferred embodiment of the invention, the absolute value of the angle of the first helix angle minus the angle of the second helix angle is less than 15 °.

In a preferred embodiment of the present invention, the angle of the second helical angle is in the range of 20 ° to 50 °.

In a preferred embodiment of the present invention, the improved milling cutter has a diameter greater than or equal to 0.2 mm.

In a preferred embodiment of the present invention, the handle is a straight shank or undercut structure.

The utility model has the advantages that:

the utility model discloses can reduce milling cutter add man-hour to the circuit board with the board resonance amplitude of this circuit of centre gripping, reach the homogeneity of control drilling hole to promote the yields of drilling operation.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a side view of the present invention

FIG. 2 is a schematic diagram of a cutting portion having a first helix angle and a second helix angle disposed about its periphery.

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand and understand, the present invention is further explained by combining with the specific drawings.

Referring to fig. 1 and 2, the present invention provides an improved milling cutter 1, which includes a shank 11 and a cutter body 12 extending outward from the shank 11, the cutter body 12 is provided with a cutting portion 13 at the other end opposite to the shank 11, the cutting portion 13 includes at least two cutting tips 131, a concave portion 132 is formed at the center of two adjacent cutting tips 131, a cutter core 133 is formed at each of the concave portion 132 and the two cutting tips 131, and a bevel 134 is obliquely extended from each of the two cutter cores 133 to the outside.

A plurality of cutting faces 121 and a plurality of flutes 120 are obliquely and alternately arranged on the blade body 12, and in the embodiment, specifically, 7 cutting faces 121 and 7 flutes 120 can be arranged.

The lands 121 and flutes 120 extend through the body 12 and have two bevels 134 at each end to the shank 11 and cutting portion 13.

A first helix angle theta 1 is provided on one of the facets 121 and a second helix angle theta 2 is provided on at least one of the facets 121 other than the facet 121.

The first helix angle θ 1 is an angle between one of the edge surfaces 121 and the center of the blade 12, and similarly, the second helix angle θ 2 is an angle between each of the other edge surfaces 121 and the center of the blade 12.

In this example, six other facets 121 are provided with a second helix angle θ 2.

The angle of the first helix angle θ 1 is different from the angle of the second helix angle θ 2, and the angle of the helix angle on one of the cutting surfaces 121 is different from the angles of the helix angles on the other cutting surfaces 121, so that the resonance amplitude of the milling cutter 1 and a machine (not shown) for clamping a circuit board (not shown) during drilling the circuit board (not shown) can be reduced, the uniformity of drilling holes can be controlled, and the yield of drilling operation can be improved.

If the angle of the helix angle of each blade surface 121 is the same, the improved milling cutter 1 can generate a fixed amplitude during operation, and the helix angle of one blade surface 121 is different from that of each other blade surface 121, so that when the improved milling cutter 1 operates, the blade surfaces 121 with the helix angles different from those of the other blade surfaces 121 generate impedance with the other blade surfaces 121, and the amplitudes are mutually offset, thereby reducing the resonance amplitude of the milling cutter 1 and a machine (not shown) for clamping a circuit board (not shown) during drilling the circuit board, and achieving the purposes of controlling the uniformity of drilling holes and improving the yield of drilling operation.

The absolute value of the angle obtained by subtracting the angle theta 2 from the angle theta 1 of the first spiral angle is less than 15 degrees, and the reduction effect of the resonance amplitude of the machine is the best when the angle range of the second spiral angle is 20-50 degrees.

In addition, the helix angle of more than two edge surfaces 121 can be set to be different from that of other edge surfaces 121, which can be determined according to actual requirements.

The improved milling cutter 1 may be a general type drill or a micro milling cutter with a diameter of 0.2mm or more, and the shank 11 may be a straight shank type or an undercut type structure and may be formed integrally with or separately from the body 12.

The following is a specific working process of the present application:

when the drilling operation is performed, the two tool tips 131 at the end of the tool body 12 are axially abutted against the surface of the default circuit board, and the cutting part 13 is used for drilling, and in the drilling process, the concave part 132 at the center of the tool tip 131 can prevent the whole cutting part 131 from directly abutting against the surface of the default circuit board, so that the condition that inconsistent copper foil layer evagination burrs are generated around the drilled hole due to the stress deformation of the default circuit board can be avoided, then the chip discharge grooves 120 on the tool body 12 assist in the drilling process to discharge chips quickly, and a hole can be formed after the drilling operation passes through the default circuit board, and at the same time, the chips can not be accumulated between the milling cutter 1 and the wall surface of the hole to scrape or block each other through the concave part 132 on the milling cutter 1, so that the phenomenon of cracking or breaking of the milling cutter 1 during the drilling operation can be reduced, and ensures that the drilled holes have better quality, thereby prolonging the service life of the whole milling cutter 1.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (5)

1. An improved milling cutter, said improved milling cutter comprising a shank portion and a body extending outwardly from said shank portion, said body having a cutting portion at an end opposite said shank portion, said cutting portion including at least two cutting tips, a recess being formed in a center of each of two adjacent cutting tips, a core being formed in said recess and extending outwardly therefrom, each core having a bevel extending obliquely from each side thereof, said improved milling cutter comprising: the cutter body is obliquely and alternately provided with a plurality of cutting surfaces and a plurality of chip grooves, the cutting surfaces and the chip grooves penetrate through the cutter body, two inclined surfaces extending to the handle part and the cutting part are arranged at two ends of the cutter body, a first spiral angle is arranged on one cutting surface, and a second spiral angle is arranged on at least one cutting surface in other cutting surfaces different from the cutting surface.

2. The improved milling cutter according to claim 1, characterized in that the absolute value of the angle of the first helix angle minus the angle of the second helix angle is less than 15 °.

3. The improved milling cutter as claimed in claim 2, wherein the angle of the second helix angle is in the range of 20 ° to 50 °.

4. The improved milling cutter as claimed in claim 1, wherein the improved milling cutter has a diameter of 0.2mm or greater.

5. The improved milling cutter as claimed in claim 1, wherein the shank is of straight shank or undercut construction.

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