CN102922009A

CN102922009A - Drilling cutter of super-thick copper printed wiring board

Info

Publication number: CN102922009A
Application number: CN2012104548124A
Authority: CN
Inventors: 纪龙江; 孟祥胜; 樊智洪; 郑威
Original assignee: DALIAN PACIFIC ELECTRONICS Co Ltd
Current assignee: DALIAN PACIFIC ELECTRONICS Co Ltd
Priority date: 2012-11-14
Filing date: 2012-11-14
Publication date: 2013-02-13

Abstract

The invention relates to a drilling cutter, particularly to a drilling cutter of a super-thick copper printed wiring board. The drilling cutter of the super-thick copper printed wiring board comprises a knife handle and a knife edge, wherein the knife handle and the knife edge are fixed as a whole in a welded mode. The drill point angle of the knife edge is 120 degrees, the screw angle of the knife edge is 25 - 35 degrees, the first back angle of the knife edge is 12 degrees, the second back angle of the knife edge is 40 degrees, and the assistant back angle of the knife edge is 3 - 5 degrees. Due to the fact that the first back angle of the knife edge and the second back angle of the knife edge are designed to be bigger than that of ordinary drilling cutters, the friction between the knife edge and a workpiece is effectively reduced, and the heat dissipation capacity of the cutter is greatly improved. The screw angle of the knife edge is designed to be smaller than a design of 35 - 45 degrees which is commonly used in the industry, so the strength of the knife edge is greatly improved, and the cutting deformation of the printed wiring board is reduced. The drilling point angle of the knife edge is designed to be 120 degrees which is smaller than a design of 130 degrees of the ordinary cutters, so the axial resistance is effectively reduced. The assistant back angle of the knife edge is designed to be 3 - 5 degrees, so the friction between the knife edge and a hole wall of the printed wiring board is effectively reduced, and heat produced in a drilling process is reduced.

Description

A kind of super thick copper printed circuit board drill hole cutter

Technical field

The present invention relates to a kind of drilling tool, more particularly, relate to a kind of super thick copper printed circuit board drill hole cutter.

Background technology

Adopt conventional method mainly to have following problem in printed wiring board boring:

1, because of surperficial Copper Foil too thick, be the 5-12 of common plate copper thickness doubly, need bore the 9-25 circle for aperture φ 2.0mm-φ 6.0mm drill bit could all bore copper thoroughly, can produce like this copper scale that a large amount of length surpass 20mm, mainly contain two harm: the one, for the drilling technique of semiclosed cutting state, because the long meeting of drilling cuttings is stopped up the cutter chip area, therefore cause drilling cuttings to be difficult to normal eliminating, make the drilling resistance increment, drilling torque increases, temperature raises in the hole, make limit, hole Copper Foil be subject to the impact of larger extruding force and temperature and produce distortion, namely " swollen mouth " phenomenon is difficult to after the cooling remove, and production brings larger hidden danger to postorder; Simultaneously, the increase of drilling resistance causes larger impact to life-span and the service precision of numerical control drill press spindle again; The 2nd, even these copper scale length have also surpassed the internal diameter width (internal diameter is φ 15mm) of vacuum line after curling, can stop up the vacuum system pipeline, cause and to stop to produce the cleaning vacuum system, every sweep program time 73 minutes, twice stopping state can appear, each cleaning needs 15 minutes, needs 6.4 hours cleaning vacuum systems that stop production every day;

2, produce a large amount of copper scales in the unit interval for avoiding, the dead time in the every brill of numerical control drilling machine 1 hole increases to 500ms by 0ms, give the time of vacuum system one " breathing heavily suction ", the copper scale that boring is produced can be siphoned away to greatest extent, solves with expectation and inhales the vacuum system obstructing problem that the vacuum scarce capacity causes.

3, the lamination of holing be must reduce, two layers even one deck are down to, the copper scale amount that produces in the minimizing unit interval, the copper scale amount minimizing that allows vacuum system unit interval domestic demand extract out by three layers.

Above method is to sacrifice the drilling quality requirement that a large amount of production capacities satisfies thick copper power panel, otherwise will freely not cause the hole wall quality problems such as hole wall is coarse because of chip removal. along with wiring board industry profit margin more and more lower today, each enterprise all enhances productivity in the various advanced technologies of research, we increase output and improve whole profit margin, so also must use new method to improve as possible the production efficiency of thick copper power panel boring under the prerequisite that satisfies the drilling quality requirement.

Summary of the invention

In order to solve above-mentioned problems of the prior art, the object of the invention provides a kind of super thick copper printed circuit board drill hole cutter that can enhance productivity and can guarantee product quality.

In order to realize the foregoing invention purpose, the technical scheme that the present invention takes is: a kind of super thick copper printed circuit board drill hole cutter, comprise handle of a knife and blade, described handle of a knife and described blade adopt welding to fix as one, and described blade bit tip angle is that 120 °, described blade spiral angle are that 25-35 °, described blade the first rear angle are that 12 °, described blade the second rear angle are that 40 ° and described blade front clearance degree are 3-5 °.

Beneficial effect of the present invention is: a kind of super thick copper printed circuit board drill hole cutter, comprise handle of a knife and blade, described handle of a knife and described blade adopt welding to fix as one, and described blade bit tip angle is that 120 °, described blade spiral angle are that 25-35 °, described blade the first rear angle are that 12 °, described blade the second rear angle are that 40 ° and described blade front clearance degree are 3-5 °.Compared with prior art, first, second rear angle design angle of blade of the present invention effectively reduces the friction between blade and the workpiece greater than common drilling tool, has improved greatly the heat-sinking capability of cutter.The design of described blade spiral angle will take into account edge strength and chip removal performance, will guarantee simultaneously less hole burr and ailhead effect; 25-35 ° spiral angle design is lower than the general 35-45 of industry ° design, and edge strength can be significantly improved, and has reduced simultaneously the cutting deformation of printed wiring board.Described blade bit tip angle is designed to 120 °, is lower than 130 ° of universal cutter, and axial resistance can effectively be reduced.Described blade front clearance degree is designed to 3-5 °, can effectively reduce the friction between blade and the printed wiring board hole wall, reduces the heat that produces in the boring procedure.

Description of drawings

Fig. 1 is drilling tool structure schematic diagram of the present invention.

Fig. 2 is drilling tool blade front clearance degree schematic diagram of the present invention.

Among the figure: 1, handle of a knife, 2, blade, 2a, blade the first rear angle, 2b, blade the second rear angle, 2c, blade spiral angle, 2d, blade bit tip angle, 2e, blade front clearance degree.

The specific embodiment

The invention will be further described below in conjunction with accompanying drawing.

As shown in Figure 1, 2, a kind of super thick copper printed circuit board drill hole cutter, comprise handle of a knife 1 and blade 2, described handle of a knife 1 adopts welding to fix as one with described blade 2, and described blade 2 bit tip angle 2d are that 120 °, described blade 2 spiral angle 2c are that 25-35 °, described blade 2 first rear angle 2a are that 12 °, described blade 2 second rear angle 2b are that 40 ° and described blade 2 front clearance degree 2e are 3-5 °.Angle between described blade 2 first rear angle 2a, the second rear angle 2b and the described blade 2 spiral angle 2c is called " angle of wedge ", the angle of wedge is larger, the intensity of blade 2 is just larger, otherwise then less, the design angle of described blade 2 first rear angle 2a, the second rear angle 2b is greater than common drilling tool, effectively reduce the friction between blade 2 and the workpiece, improved greatly the heat-sinking capability of cutter; The design of described blade 2 spiral angle 2c will take into account edge strength and chip removal performance, will guarantee simultaneously less hole burr and ailhead effect.Described blade 2 spiral angle 2c design is lower than the general 35-45 of industry ° design, and the intensity of blade 2 can be significantly improved, and has reduced simultaneously the cutting deformation of printed wiring board; Described blade 2 bit tip angle 2d are designed to 120 °, are lower than 130 ° of universal cutter, and axial resistance can effectively be reduced; Described blade 2 front clearance degree 2e are designed to 3-5 °, can effectively reduce the friction between blade 2 and the printed wiring board hole wall, reduce the heat that produces in the boring procedure.

Claims

1. super thick copper printed circuit board drill hole cutter, comprise handle of a knife and blade, it is characterized in that: described handle of a knife and described blade adopt welding to fix as one, and described blade bit tip angle is that 120 °, described blade spiral angle are that 25-35 °, described blade the first rear angle are that 12 °, described blade the second rear angle are that 40 °, described blade front clearance degree are 3-5 °.