CN2863328Y

CN2863328Y - Modified tangent plane structure for three-edge minisize needle

Info

Publication number: CN2863328Y
Application number: CN 200620001736
Authority: CN
Inventors: 颜灿然
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-01-24
Filing date: 2006-01-24
Publication date: 2007-01-31
Anticipated expiration: 2016-01-24

Abstract

A cut noodle structure of an improved three-wing micro-bit consists of the drill body part and handle part, three abrasive cut noodles from the same angle on the tip of drill body form three ridges whose meeting-point is vertex of a taper, and beside ridges is cutting blade parts and cuttings chutes; the structure is characterized in that: grinding each cut noodle again to make cutting blade parts to grinding line the first cut noodle, and grinding line to cuttings chute the second cut noodle, then the first cut noodle and the plane of top point of cutting blade parts from the first facial angle, and the second cut noodle and the said plane form the second facial angle, which shape the formal cut noodle into six cutting noodles; thereby, feed resistance is brought down when high-speed drilling holes, and the quality and precision are raised effectively, and the situation of derail shutdown occurs less.

Description

The tangent plane structure of improved three sword micro drill points

Technical field

The utility model relates to a kind of tangent plane structure of improved three sword micro drill points, be particularly related to a kind of at the most advanced and sophisticated tangent plane structure of three sword micro drill points as cutting boring, each tangent plane again after grind forming first tangent plane and second tangent plane, can be beneficial to the carrying out of high-speed drilling operation.

Background technology

Bore operation in the printed circuit board (PCB) processing procedure, because being glass fibre and epoxy resin laminated plates two sides or middle pressing Copper Foil, printed circuit board (PCB) forms, basically the resin of material has accounted for overall volume more than 70%, its heat distortion temperature is at 90 ℃ to 150 ℃, if that is boring in temperature above 150 ℃, drilling cuttings becomes the melting state immediately, and stick together on drill bit and hole wall, be called the glue slag, and the number of glue slag can increase the degree of difficulty of successive process, at present the life-span of drill bit is about 1500 to 2000 times (with 2 to 4 borings together of happening frequently as once), and must in 10 minutes, finish, and drill speed is about 100,000 commentaries on classics, its chisel edge temperature especially up to 300 ℃ to 500 ℃, so the drill bit chip resistance is just more important; For cooperating electronic product towards microminiaturization, thus the size decreases of drill bit the required precision of position, hole is more significantly improved, so that the polarization of drill bit and rigidity also become is even more important.

The inventor once disclosed a kind of miniature three blade drill bits ZL200420077295.4 number in Chinese utility model patent, see also Fig. 1, it is to grind to form three tangent plane a1 at drill body part a tip with same angle, can form a crest line a2 at tangent plane a1 in twos, and three crest line a2 confluces form a taper cusp a3, and form blade part a4 and chip removal groove a5 in the both sides of crest line a2 respectively, form bigger chip removal space by the blade part a4 and the chip removal groove a5 of two opposite faces; It has three blade part a4 and the increasing of chip removal space mat, can increase the speed of cutting and chip removal, because of being mutually 120 degree, three blade part a4 when rotary cutting, check and balance, not only less to the rigidity effects of boring body, drill bit can not shake because of cutting resistance, beat, therefore the hole out of roundness and the hole wall quality of being bored improves relatively, and its stock-removing efficiency increases substantially, find that through the reality test the inclined to one side degree of broken needle and hole reduces more than 80%, and the life-span of drill bit relatively improves many, be used in general in, during the bore operation of low speed, suitable is handy; But, because it is increasing on the market to the demand of electronic component, as bearing the circuit board fractal key more just that connects electronic building brick, therefore, also more and more exquisite for quality of holing on the circuit board and speed, and the speed of at present general high-speed drilling machine is set in more than rotating speed 150,000 commentaries on classics more, and more than the feed speed 4.0m/ branch, its cutting speed is quite fast, when reality was used, because the tangent plane of drill body part is the surface that fits in fully in the cutting hole, its contact area was excessive at the designed miniature three blade drill bits of the utility model, and the break flour that cutting is come out such as can't discharge smoothly at situation, the resistance of formation during to the drill body part feed when described resistance during greatly to a certain degree, not only can have influence on drilling quality, can't cut boring, the most serious situation that may cause broken needle takes place, so be necessary to be improved.

Therefore, this case inventor has and states the disappearance of miniature three blade drill bits when the high-speed drilling operation in view of this, study intensively, and long-pending individual is engaged in the many years of experience of described cause, design a kind of tangent plane structure of brand-new improved three sword micro drill points eventually, the tangent plane at original drill body part tip is improved, carrying out the continuous quadratic grinding to form first tangent plane and second tangent plane by blade part, and make and have suitable differential seat angle between two tangent planes, contact area in the time of not only can making the boring cutting in apex point and the cutting hole reduces, and forming the many places breach at periphery and make break flour be able to smooth discharge by the apex point apical view, and can effectively reduce the resistance in when cutting, with problem (as: the drilling quality variation of avoiding miniature three blade drill bits to be taken place when the high-speed drilling, can't cut boring or even broken needle or the like), improved three sword micro drill points really in the usefulness of practice.

Summary of the invention

The purpose of this utility model aims to provide a kind of tangent plane structure of three sword micro drill points, and effectively reduces the feed resistance of drill point when high-speed drilling, and effectively promotes drilling quality and borehole accuracy, and reduces the generation of broken needle.

For reaching above-mentioned purpose, the utility model provides a kind of tangent plane structure of improved three sword micro drill points, it is to have comprised drill body part and drill shank, it is characterized in that: after described drill body part tip grinds to form three tangent planes with same angle, each tangent plane is passed through the not equal angular grinding of continuous quadratic to form first tangent plane and second tangent plane, be formed with abrasive wire between its first tangent plane and second tangent plane, by blade part to abrasive wire is first tangent plane, and abrasive wire to chip removal groove is second tangent plane, and first angle of formation between the horizontal plane of first tangent plane and blade part peak, be formed with dihedral angle between second tangent plane and described horizontal plane, form the aspect of six tangent planes at the drill body part end face, and have suitable differential seat angle between first angle and dihedral angle.

First angle is in 3 °～20 ° scope.Dihedral angle is in 10 °～50 ° scope.The differential seat angle of first angle and dihedral angle is in 5 °～30 ° scope.

Advantage of the present utility model: according to above-mentioned structure, when carrying out the high-speed drilling operation, its blade part forms the structure that contacts the cutting hole inner surface with first tangent plane, can effectively reduce the frictional resistance that existing drill point produces because of contact area is excessive; And utilize between first tangent plane and second tangent plane suitable differential seat angle is arranged, can be formed on the bigger breach of chip removal slot wedge, break flour when making the cutting circuit board is taken out of smoothly, and the resistance of hoarding when effectively reducing because of cutting that break flour brought, help reducing the feed resistance of drill point, so can reach effective lifting drilling quality and borehole accuracy, and reduce the purpose of the generation of broken needle.

Description of drawings

Fig. 1 is the three-dimensional structure diagram of existing miniature three blade drill bits;

Fig. 2 is the schematic diagram of the utility model first tangent plane, second tangent plane and former tangent plane;

Fig. 3 is the amplification top view at the utility model drill point tip;

Fig. 4 is a three-dimensional structure diagram of the present utility model;

Chip removal schematic diagram when Fig. 5 holes for the utility model.

Description of reference numerals: 10 drill body parts; 20 drill shanks; 11 tangent planes; 12 taper cusps; 13 crest lines; 14 blade parts; 15 chip removal grooves; 11a first tangent plane; 11b second tangent plane; The 11c abrasive wire; First angle of α; The β dihedral angle; 2 circuit boards; The 2a break flour.

The specific embodiment

Relevant structure of the present utility model, device and feature thereof are lifted a preferable possible embodiments and are cooperated graphic being described in detail as follows.

Please arrange in pairs or groups Fig. 2 to shown in Figure 5, the tangent plane structure of improved three sword micro drill points of the present utility model, it is to have comprised drill body part 10 and drill shank 20, its drill body part 10 tips grind to form three tangent planes 11 with same angle, formation meets at three crest lines 13 of same taper cusp 12, and crest line 13 both sides have blade part 14 and chip removal groove 15 respectively, and form the drill point with three swords, wherein;

Again with after the not equal angular grinding of each tangent plane 11 process continuous quadratic, to form the first tangent plane 11a and the second tangent plane 11b, and be formed with abrasive wire 11c between the first tangent plane 11a and the second tangent plane 11b, by blade part 14 to abrasive wire 11c be the first tangent plane 11a, abrasive wire 11c to chip removal groove 15 be the second tangent plane 11b, and be formed with first angle α between the horizontal plane of described first tangent plane 11a and blade part 14 peaks, the angle of described first angle α is in 3 °～20 ° scope, be formed with dihedral angle β between the horizontal plane of the second tangent plane 11b and blade part 14 peaks, the angle of described dihedral angle β is in 10 °～50 ° scope, form the aspect of six tangent planes at the drill body part end face, and have suitable differential seat angle between first angle and dihedral angle, its differential seat angle is about 5 °～30 °.

When the high-speed drilling operation is carried out, it utilizes blade part 14 and first tangent plane 11a contact cutting hole inner surface, and the frictional resistance when significantly having reduced contact area it rotating with effective reduction; And utilize between the first tangent plane 11a and the second tangent plane 11b suitable differential seat angle is arranged, can be formed on the bigger breach in chip removal groove 15 edges, the break flour 2a of cutting during circuit board 2 taken out of smoothly, and the resistance that the break flour 2a that hoards when effectively reducing because of cutting is brought.

In sum, the tangent plane structure of the improved three sword micro drill points of the utility model, it is that original three tangent planes are become six tangent planes, and the angle of first angle and dihedral angle is variant, make frictional force reduce the feed resistance that chip removal speed reduces drill point soon and effectively, can effectively promote drilling quality and borehole accuracy, and reduce the generation of broken needle.

Claims

1. the tangent plane structure of improved three sword micro drill points, it is to have comprised drill body part and drill shank, it is characterized in that: after described drill body part tip grinds to form three tangent planes with same angle, each tangent plane is passed through the not equal angular grinding of continuous quadratic to form first tangent plane and second tangent plane, be formed with abrasive wire between its first tangent plane and second tangent plane, by blade part to abrasive wire is first tangent plane, and abrasive wire to chip removal groove is second tangent plane, and first angle of formation between the horizontal plane of first tangent plane and blade part peak, be formed with dihedral angle between second tangent plane and described horizontal plane, form the aspect of six tangent planes at the drill body part end face, and have suitable differential seat angle between first angle and dihedral angle.

2. the tangent plane structure of improved three sword micro drill points as claimed in claim 1 is characterized in that: first angle is in 3 °～20 ° scope.

3. the tangent plane structure of improved three sword micro drill points as claimed in claim 1 is characterized in that: dihedral angle is in 10 °～50 ° scope.

4. the tangent plane structure of improved three sword micro drill points as claimed in claim 1 is characterized in that: the differential seat angle of first angle and dihedral angle is in 5 °～30 ° scope.