CN210702763U

CN210702763U - Improved milling cutter

Info

Publication number: CN210702763U
Application number: CN201921211187.4U
Authority: CN
Inventors: 刘晓利; 祖国庆; 陈彦舟
Original assignee: Shanghai Topoint Precision Technology Co
Current assignee: Shanghai Topoint Precision Technology Co
Priority date: 2019-07-30
Filing date: 2019-07-30
Publication date: 2020-06-09
Anticipated expiration: 2029-07-30

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, locates to form a concave part at the center of two adjacent knife tips the concave part respectively is formed with a knife tip to these two knife tips, and the slope of each outside of these two knife tips extends and has an inclined plane, its characterized in that: 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 handle part and the cutting part are arranged at two ends of the cutter body, and the height of one blade surface is different from that of other blade surfaces. 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 relative 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, a plurality of blade surfaces and a plurality of chip grooves are obliquely and alternately arranged on the cutter body, 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, and the height of one blade surface in the blade surfaces is different from the height of other blade surfaces.

In a preferred embodiment of the present invention, the height of one of the blade surfaces is a first height, the height of each of the other blade surfaces is a second height, a virtual center of a circle is provided in the cross-section of the blade body, the virtual center of a circle corresponds to each of the blade surfaces and is provided with a tangent line, the highest point of each of the blade surfaces also has a tangent line, the first height is a distance between the tangent line at the highest point on one of the blade surfaces and the tangent line corresponding to the virtual center of a circle, and the second height is a distance between the tangent line at the highest point on any one of the other blade surfaces and the tangent line corresponding to the virtual center of a circle.

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 sectional view taken along a-a in fig. 1.

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.

The height of one of the edge surfaces 121 is a first height H1, the heights of the edge surfaces 121 are the same and are a second height H2, and the first height H1 is different from the second height H2.

A virtual circle center 122 is arranged in the cross section of the blade body 12, a tangent line is respectively arranged at the virtual circle center 122 corresponding to each blade surface 121, the highest point of each blade surface 121 also has a tangent line, the first height H1 is the distance between the tangent line at the highest point on one blade surface 121 and the tangent line corresponding to the blade surface 121 at the virtual circle center 122, and the second height H2 is the distance between the tangent line at the highest point on any other blade surface 121 and the tangent line corresponding to the blade surface 121 at the virtual circle center 122.

In this embodiment, the height of one of the cutting surfaces 121 is different from the heights of the other cutting surfaces 121, so that the resonance amplitude of the milling cutter 1 and a machine (not shown) for clamping the 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, every facet 121's height all is the same, so can make improvement type milling cutter 1 in service, produce fixed amplitude, and apply for through the height with one of them facet 121 different from each other facet 121, like this, improvement type milling cutter 1 in service, the facet 121 that highly is different from other facets 121 can produce the impedance with other facets 121, the amplitude can offset each other, thereby reduce milling cutter 1 when drilling the circuit board (not shown) with the board (not shown) resonance amplitude of centre gripping this circuit board, reach the homogeneity of control drilling hole and promote the yields of drilling operation.

In addition, the height of more than two edge surfaces 121 can be set to be different from that of other edge surfaces 121, and the height 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

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 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 handle part and the cutting part are arranged at two ends of the cutter body, and the height of one blade surface is different from that of other blade surfaces.

2. An improved milling cutter according to claim 1, wherein the height of one of the cutting surfaces is a first height, the height of each of the other cutting surfaces is a second height, a virtual center of circle is provided in the cross-section of the cutter body, a tangent line is provided at the virtual center of circle corresponding to each cutting surface, the highest point of each cutting surface is provided with a tangent line, the first height is the distance between the tangent line at the highest point of one of the cutting surfaces and the corresponding tangent line at the virtual center of circle, and the second height is the distance between the tangent line at the highest point of any one of the other cutting surfaces and the corresponding tangent line at the virtual center of circle.

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

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