CN202239816U

CN202239816U - Microbit

Info

Publication number: CN202239816U
Application number: CN201120390880XU
Authority: CN
Inventors: 郭强; 付连宇
Original assignee: Shenzhen Jinzhou Precision Technology Corp
Current assignee: Shenzhen Jinzhou Precision Technology Corp
Priority date: 2011-10-14
Filing date: 2011-10-14
Publication date: 2012-05-30
Anticipated expiration: 2021-10-14

Abstract

The utility model discloses a microbit which comprises two main cutting edges and each main cutting edge is correspondingly provided with a first back tool face and a second back tool face. The microbit is characterized in that the intersecting line of the first back tool face and the second back tool face deviates from the axis of the bit; the two first back tool faces extend towards the axis of the bit to form two core edge tool faces which intersect at the axis of the bit to form a chisel edge; the chisel edge is a straight-line section; and the sides of the two core edge tool faces, which intersect with the corresponding main cutting edges, form two drill core blade tips. According to the utility model, the cutting efficiency is improved, the wear of the bit is reduced and the positioning performance of the bit can be improved.

Description

A kind of microbit

Technical field

The utility model relates to the machined field, in particular, relates to a kind of microbit.

Background technology

The PCB circuit board need utilize microbit to punch in process, and along with the trend of miniaturization of electronic products, the board area of said function is in progressively reduction, and the aperture of processing is also dwindling, and this has higher requirement to processing technology.The PCB microbit that often has in the prior art comprises 129 drill bits and 131 drill bits.129 drill bits have an apex point; Two chisel edges are an obtuse angle at the apex point place; This drill bit single apex point in processing work goes into to bore; Positioning performance is poor, and drill bit PCB glass fabric in drilling process intersects rugged surface in length and breadth to be made apex point suffer the impact of cross force and cause that boring position, hole precision reduces, the hole is slightly bad; And 131 chisel edges are a straightway, and chisel edge is long and main cutting edge is shorter, and frictional resistance is big in the time of drill bit processing, serious wear, and 131 bit drill diameters are not suitable for processing miniature aperture more than 3mm.

The utility model content

The utility model technical problem to be solved provides the microbit of good, the low wearing and tearing of a kind of positioning performance, high stock-removing efficiency.

The purpose of the utility model realizes through following technical scheme:

A kind of microbit comprises two main cutting edges, and said each main cutting edge correspondence is provided with the major first flank and the second back knife face, and the intersection of the said major first flank and the second back knife face departs from the drill axis position; Said two major first flanks extend to form two core angle of throat faces toward the drill axis place; Said core angle of throat face intersects the formation chisel edge at the drill axis place; Said chisel edge is a straightway, and one side that said two core angle of throat faces and said main cutting edge intersect forms two apex point core swords.

Preferably, said chisel edge is perpendicular to said apex point core sword.The utility model goes into to bore through chisel edge; If chisel edge is long; Can be added to the brill resistance, increase bit wear, therefore under the situation of drill bit intensity permission, can shorten chisel edge length as far as possible; And chisel edge during perpendicular to said apex point core sword chisel edge length the shortest, therefore go into to bore resistance and bit wear also minimum.

Preferably, said chisel edge tilts to intersect setting with said apex point core sword relatively.In this technical scheme, can increase chisel edge length, that improves drill bit goes into to bore intensity.

Preferably, the projection of straight line on the cutting plane at said two main cutting edges place is parallel to each other.Drill bit is centrosymmetric like this, the stressed equalization of both sides main cutting edge, the good stability of cutting.

Preferably, the projection of straight line on the cutting plane at said two main cutting edges place intersected, and its angle is 0 °～120 °.The drill bit of general two main cutting edges, the stress of workpiece all focus on the thinnest unbearable part of near axis, produce drill bit and burst apart in case stress is crossed conference; And adopt this technical scheme, and the unbalance stress of the main cutting edge on both sides etc., in the drill bit use, workpiece also significantly reduces the past brill of the stress core thin place skew that the drill bit blade produces, and has significantly promoted the anti-adaptability to changes of drill bit.

A kind of microbit; Comprise two main cutting edges; Said each main cutting edge correspondence is provided with the back knife face, and said two corresponding back knife faces of main cutting edge are provided with two core angle of throat faces in the intersection, and said core angle of throat face intersects the formation chisel edge at the drill axis place; Said chisel edge is a straightway, and one side that said core angle of throat face and said main cutting edge intersect forms apex point core sword.

In the utility model; Adopted apex point core sword at the drill bit mid portion; Be equivalent to main cutting edge and partly extend, increased the edge length of participating in cutting operation, improved stock-removing efficiency toward drill axis; And the cutting way wearing and tearing are little, therefore increased the edge length of participating in cutting operation and can also effectively reduce bit wear.In addition; Core angle of throat face goes out to have formed chisel edge in drill axis, and drill bit goes into to bore through chisel edge in boring, compares the brill mode of clicking and entering that other go into to bore through apex point; The drill bit of the utility model is that the line of chisel edge is gone into the brill mode; Go into to bore the back and form the yi word pattern groove, this groove can limit the drill bit skew well, has improved the positioning performance of drill bit.

Description of drawings

Fig. 1 is drill bit first schematic perspective view of the utility model embodiment one;

Fig. 2 is drill bit second schematic perspective view of the utility model embodiment one;

Fig. 3 is drill bit the 3rd schematic perspective view of the utility model embodiment one;

Fig. 4 is drill bit the 4th schematic perspective view of the utility model embodiment one;

Fig. 5 is the bit edge facial planes sketch map of the utility model embodiment one;

Fig. 6 A is the utility model embodiment two drill bits first schematic perspective views;

Fig. 6 B is the blade vertical view of the utility model embodiment two drill bits first schematic perspective view;

Fig. 7 is the utility model embodiment two drill bits second schematic perspective views;

Fig. 8 is the utility model embodiment two drill bits the 3rd schematic perspective views;

Fig. 9 is the utility model embodiment two drill bits the 4th schematic perspective views;

Figure 10 is the utility model embodiment two drill bit cutaway views;

Figure 11 is existing drill bit stress schematic perspective view;

Figure 12 is existing drill bit stress generalized section;

Figure 13 is the utility model embodiment two drill bit stress schematic perspective views;

Figure 14 is the utility model embodiment two drill bit stress generalized sections;

Figure 15 A is a drill bit schematic perspective view after the utility model embodiment four steps A;

Figure 15 B is a drill bit generalized section after the utility model embodiment four steps A;

Figure 16 A is a drill bit schematic perspective view behind the utility model embodiment four step B;

Figure 16 B is a drill bit generalized section behind the utility model embodiment four step B;

Figure 17 A is a drill bit schematic perspective view behind the utility model embodiment four step C;

Figure 17 B is a drill bit generalized section behind the utility model embodiment four step C;

Wherein: 1, main cutting edge; 2, major first flank; 3, the second back knife face; 4, chisel edge; 5, apex point core sword, 6, core angle of throat face.

The specific embodiment

Below in conjunction with accompanying drawing and preferred embodiment the utility model is described further.

Embodiment one, shown in Fig. 1～5:

A kind of microbit comprises two main cutting edges 1, and said each main cutting edge correspondence is provided with the major first flank 2 and the second back knife face 3, and the intersection of the said major first flank 2 and the second back knife face 3 departs from the drill axis position.Said two major first flanks 2 extend to form two core angle of throat faces 6 toward the drill axis place; Said core angle of throat face 6 intersects formation chisel edge 4 at the drill axis place, one side two apex point core swords 5 that formed shear action that said two core angle of throat faces 6 and said main cutting edge 1 intersect.The width of chisel edge 4 tilts to intersect setting with respect to said apex point core sword 5; The projection of straight line on the cutting plane at two main cutting edge places is parallel to each other.

In the utility model, chisel edge 4 also can be perpendicular to apex point core sword 5.Go into to bore through chisel edge 4,, can be added to the brill resistance, increase bit wear if chisel edge 4 is long; Yet the material rigidity of drill bit is not enough, and too short chisel edge 4 can let stress too much concentrate near axis, and the blade of producing drill bit easily bursts apart.

Embodiment two, shown in Fig. 6 A～14:

A kind of microbit comprises two main cutting edges 1, and said each main cutting edge correspondence is provided with the major first flank 2 and the second back knife face 3, and the intersection of the said major first flank 2 and the second back knife face 3 departs from the drill axis position.Said two major first flanks 2 extend to form two core angle of throat faces 6 toward the drill axis place, and said core angle of throat face 6 intersects formation chisel edge 4 at the drill axis place, one side the apex point core sword 5 that has formed shear action that said core angle of throat face 6 and said main cutting edge 1 intersect.The width of chisel edge 4 tilts to intersect setting with respect to said apex point core sword 5; The projection of straight line on the cutting plane at two main cutting edge places intersected.

Like Figure 11, shown in 12, the drill bit of general two main cutting edges, the stress of workpiece all focuses on axis portion, and that axis portion is bored core thickness is the thinnest, produces drill bit and bursts apart in case stress is crossed conference; And adopt this technical scheme, and like Figure 13, shown in 14, the unbalance stress of the main cutting edge on both sides etc., in the drill bit use, workpiece also significantly reduces the past brill of the stress core thin place skew that the drill bit blade produces, and has significantly promoted the anti-adaptability to changes of drill bit.

Embodiment three

A kind of microbit; Comprise two main cutting edges 1; Said each main cutting edge correspondence is provided with the back knife face; Knife face is provided with two core angle of throat faces 6 that intersect at the drill axis place after said two in the intersection, and said core angle of throat face 6 intersects formation chisel edge 4 at the drill axis place, and said core angle of throat face 6 forms apex point core sword 5 with one side that said main cutting edge 1 intersects.The width of said chisel edge 4 tilts to intersect setting with respect to said apex point core sword 5.

Embodiment four

A kind of manufacturing approach of microbit may further comprise the steps:

A: shown in Figure 15 A, 15B, process two staggered back knife faces at the blade of drill bit, knife face does not connect after two, forms the plane at the top of drill axis position;

B: shown in Figure 16 A, 16B, on the knife face of said back, polish the major first flank and the second back knife face, and form two corresponding main cutting edges; The intersection of the said major first flank and the second back knife face departs from the drill axis position.

C: shown in Figure 17 A, 17B, the said plane of polishing forms two core angle of throat faces that intersect at the drill axis place, and said core angle of throat face intersects the formation chisel edge at the drill axis place.One side that said core angle of throat face and said main cutting edge intersect forms apex point core sword; Chisel edge tilts to intersect setting with said apex point core sword relatively; The projection of straight line on the cutting plane at two main cutting edge places is parallel to each other.

Certainly; Said chisel edge can be perpendicular to said apex point core sword, and chisel edge is long, can be added to the brill resistance; Increase bit wear; Therefore under the situation of drill bit intensity permission, should shorten chisel edge length as far as possible, and chisel edge during perpendicular to said apex point core sword chisel edge length the shortest, therefore go into to bore resistance and bit wear also minimum.

In addition, the projection of straight line on the cutting plane at two main cutting edge places also can be intersected.The drill bit of general two main cutting edges, the stress of workpiece all focuses on axis portion, and that axis portion is bored core thickness is the thinnest, produces drill bit and bursts apart in case stress is crossed conference; And adopt this technical scheme, and the unbalance stress of the main cutting edge on both sides etc., in the drill bit use, workpiece also significantly reduces the past brill of the stress core thin place skew that the drill bit blade produces, and has significantly promoted the anti-adaptability to changes of drill bit.

In the utility model; Adopted apex point core sword 5 at the drill bit mid portion; Be equivalent to main cutting edge 1 and partly extend, increased the edge length of participating in cutting operation, improved stock-removing efficiency toward drill axis; And the cutting way wearing and tearing are little, therefore increased the edge length of participating in cutting operation and can also effectively reduce bit wear.In addition, core angle of throat face 6 goes out to have formed chisel edge 4 in drill axis, and drill bit goes into to bore through chisel edge 4 in boring; Compare other through the brill mode of clicking and entering that apex point goes into to bore, the drill bit of the utility model is that the line of chisel edge 4 is gone into the brill mode, goes into to bore the back and forms the yi word pattern groove; This groove can limit the drill bit skew well, improved the positioning performance of drill bit, and core angle of throat face 6 is very narrow; Therefore chisel edge 4 is also very short, and it is very little to the influence of drill bit with wearing and tearing to go into to bore resistance.

Above content is the further explain that combines concrete preferred implementation that the utility model is done, and can not assert that the practical implementation of the utility model is confined to these explanations.For the those of ordinary skill of technical field under the utility model, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be regarded as belonging to the protection domain of the utility model.

Claims

1. a microbit comprises two main cutting edges, and said each main cutting edge correspondence is provided with the major first flank and the second back knife face, it is characterized in that, the intersection of the said major first flank and the second back knife face departs from the drill axis position; Said two major first flanks extend to form two core angle of throat faces toward the drill axis place; Said core angle of throat face intersects the formation chisel edge at the drill axis place; Said chisel edge is a straightway, and said two core angle of throat faces form two apex point core swords with one side that corresponding main cutting edge intersects.

2. a kind of microbit as claimed in claim 1 is characterized in that, said chisel edge is perpendicular to said apex point core sword.

3. a kind of microbit as claimed in claim 1 is characterized in that, said chisel edge tilts to intersect setting with said apex point core sword relatively.

4. a kind of microbit as claimed in claim 1 is characterized in that, the projection of straight line on the cutting plane at said two main cutting edges place is parallel to each other.

5. a kind of microbit as claimed in claim 1 is characterized in that, the projection of straight line on the cutting plane at said two main cutting edges place intersected.

6. microbit; Comprise two main cutting edges, said each main cutting edge correspondence is provided with the back knife face, it is characterized in that; Said two corresponding back knife faces of main cutting edge are provided with two core angle of throat faces in the intersection; Said core angle of throat face intersects the formation chisel edge at the drill axis place, said chisel edge is a straightway, and one side that said core angle of throat face and said main cutting edge intersect forms apex point core sword.