CN218226976U - High-precision micro drill point - Google Patents

Abstract

The utility model provides a little drill point of high accuracy is applicable to and processes PCB, include the handle of a knife and set up the drill point body on the handle of a knife, the tip that the handle of a knife was kept away from to the drill point body is provided with two main smear metal swords, two main smear metal sword slopes to set up in the tip of drill point body, be the chisel edge between two main smear metal swords, every main smear metal sword all includes rake face and back knife face, rake face and back knife face are crossing in order to form main smear metal sword according to predetermineeing the angle, the chip groove has been seted up along the length direction of its main smear metal sword that corresponds to every rake face, the chip groove is used for the discharge of smear metal, borrow the length of chip groove in order to extend main smear metal sword and shorten the length of chisel edge. The utility model discloses a little drill point of high accuracy, the cutting part of main smear metal sword is more wear-resisting, and the chip breaking and the machining precision of being convenient for more are better, are suitable for extensive using widely.

Description

High-precision micro drill point

Technical Field

The utility model relates to a drilling processing technology field especially relates to a little drill point of high accuracy.

Background

With the increasing miniaturization of electronic products, printed Circuit Boards (PCBs) adapted to the products are also developing toward miniaturization, lightness and thinness, the line width and line distance of the PCBs are becoming narrower and narrower, and the requirements on the position precision and drilling quality of PCB drilling processing are also becoming higher and higher. The drilling quality of the PCB is mostly determined by the structure of the drill point itself, and the drilling on the PCB generally requires a drill point with a smaller diameter to be performed to achieve the required drilling quality. At present, under the condition that the diameter of a micro drill point on the market is small, the situations of poor chip breaking, poor wear resistance of a blade part, poor hole site precision and the like are easy to occur during drilling.

Therefore, it is necessary to provide a high-precision micro drill point with a wear-resistant cutting edge, convenient chip breaking and chip removal and good machining precision.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a cutting part is wear-resisting, the chip breaking of being convenient for is convenient for the chip removal and the fine high accuracy of machining precision is little drill point.

In order to realize the above-mentioned purpose, the utility model provides a little drill point of high accuracy is applicable to and processes PCB, include the handle of a knife and set up the drill point body on the handle of a knife, the tip that the handle of a knife was kept away from to the drill point body is provided with two main smear metal swords, two main smear metal sword slopes to set up in the tip of drill point body, be the chisel edge between two main smear metal swords, every main smear metal sword all includes rake face and back knife face, rake face and back knife face are crossed in order to form main smear metal sword according to predetermineeing the angle, the chip groove has been seted up along the length direction of its main smear metal sword that corresponds to every rake face, the chip groove is used for the discharge of smear metal, borrow the length of chip groove in order to extend main smear metal sword and shorten the length of chisel edge.

Preferably, the predetermined angle is between 60 ° and 78 °.

Preferably, the one end that the handle of a knife was kept away from to the drill point body is the cutting section, and main cutting sword and chisel edge set up on the cutting section, and the cutting section is the spiral helicla flute that is connected in the chip groove along global, and the spiral flute is used for the chip removal.

Preferably, the chip flute is located between the main cutting edge and the helical flute, and the chip flute is located near the center of the cutting section, so as to be able to lengthen the main cutting edge and shorten the chisel edge.

Preferably, one end of the chip discharge groove communicated with the spiral groove inclines towards the direction close to the spiral groove so as to discharge chips better.

Preferably, the chip grooves and the rake face are in smooth transition.

Preferably, the chip grooves are of arc structures.

Preferably, the depth of the flutes is between 15% and 20% of the diameter of the drill bit body.

Preferably, the length of the main cutting edge is between 50% and 55% of the diameter of the drill bit body.

Preferably, the length of the chisel edge is between 3% and 5% of the drill bit body diameter.

Compared with the prior art, the utility model discloses a little drill point of high accuracy is applicable to the trompil on PCB, also can be used for trompil on other work pieces. The high-precision micro drill bit comprises a cutter handle and a drill bit body arranged on the cutter handle, wherein one end, far away from the cutter handle, of the drill bit body is a cutting section, two main cutting edges are obliquely arranged at the end part of the cutting section, the two main cutting edges are identical in structure, and a cross edge is arranged between the two main cutting edges. The spiral on the cutting section is provided with a spiral groove communicated with the main cutting edge, a chip removal groove is formed between the spiral groove and the main cutting edge, and the chip removal groove and the front cutter face are in smooth transition. The spiral groove and the chip removal groove are used for removing chips. Each main cutting edge comprises a rake face and a flank face which intersect at a predetermined angle of 60 ° to 78 ° to form the main cutting edge. Because the included angle between the front cutter face and the rear cutter face is increased, the strength of the main cutting edge is higher, and the cutting edge of the main cutting edge is more wear-resistant. The chip grooves are arranged on the front tool face along the length direction of the corresponding main chip cutting edge. The chip groove is arranged, so that chips can be better broken, and the chips can be more conveniently discharged. Meanwhile, the chip grooves are arranged, so that the length of the main cutting edge is increased, and the length of the chisel edge is shortened. The extension of main smear metal sword can be better acts on panel such as PCB or other work pieces, more is favorable to the formation of smear metal for axial atress reduces during the drilling, and the drill point head is difficult to the swing, thereby makes the hole site precision obtain promoting. On the other hand, the shortening of the chisel edge reduces the axial resistance of the chisel edge part formed by extruding the PCB board during drilling, and the drill point head is not easy to swing, so that the hole site precision is improved. The utility model discloses a little drill point of high accuracy, the cutting part of main smear metal sword is more wear-resisting, is provided with the chip groove, and the chip breaking and the machining precision of being more convenient for are better, are suitable for extensive using widely.

Drawings

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

Fig. 1 is a structural diagram of a high-precision micro drill point according to an embodiment of the present invention.

Fig. 2 is a block diagram of the drill bit body of fig. 1.

Fig. 3 is a partial block diagram of the cutting segment of fig. 2.

Fig. 4 is a view of the structure of fig. 3 from another angle.

Fig. 5 is a view from a still further angle of fig. 3.

Fig. 6 is a top view of fig. 3.

Fig. 7 is a view from a further angle in the structure of fig. 3.

Description of reference numerals:

100. a high-precision micro drill point;

10. a drill point body; 101. a cutting section; 11. a main chip cutting edge; 111. a rake face; 112. a flank face; 12. a chisel edge; 13. a chip groove; 14. a helical groove;

20. a knife handle.

Detailed Description

In order to explain the technical contents and structural features of the present invention in detail, the following description is made with reference to the embodiments and the accompanying drawings.

Referring to fig. 1 to 3, the present invention provides a high precision micro drill point 100, which is suitable for drilling PCB and can be used for drilling other plates or workpieces. The high-precision micro drill point 100 comprises a cutter handle 20 and a drill point body 10 arranged on the cutter handle 20, wherein two main cutting edges 11 are arranged at the end part of the drill point body 10 far away from the cutter handle 20, and the two main cutting edges 11 are obliquely arranged at the end part of the drill point body 10 according to a certain angle. The two main cutting edges 11 are identical in structure, and one main cutting edge 11 can reach the other main cutting edge 11 by rotating at a certain angle. Between the two main cutting edges 11 is a chisel edge 12. Specifically, each main cutting edge 11 includes a rake surface 111 and a flank surface 112, and the rake surface 111 and the flank surface 112 intersect at a predetermined angle to form the main cutting edge 11. As shown in fig. 3, the included angle between the rake surface 111 and the flank surface 112 is a, and the larger the included angle between the rake surface 111 and the flank surface 112 is, the stronger the strength of the main cutting edge 11 is, the less likely it is to break, and the more wear-resistant the cutting edge of the main cutting edge. Illustratively, the preset angle a may be any suitable angle between 60 ° and 78 °. On the other hand, the rake surface 111 of each main cutting edge 11 has a chip groove 13 opened along the longitudinal direction of the corresponding main cutting edge 11, and the chip groove 13 is used for discharging chips. The flute 13 is used to lengthen the main cutting edge 11 and shorten the chisel edge 12. As can be appreciated, the chip flutes 13 open in the rake surface 111 in the longitudinal direction of their respective main cutting edges 11. The chip groove 13 is arranged, so that chips can be better broken, and the chips can be more conveniently discharged. At the same time, the length of the main cutting edge 11 is also increased by the chip flute 13 and the length of the chisel edge 12 is shortened. The lengthening of the main cutting edge 11 can better act on boards such as PCBs or other workpieces to be processed, can better drill the workpieces to be processed, and is more favorable for cutting formation. The main cutting edge 11 is lengthened, so that the axial stress during drilling is reduced, the head of the drill point is not easy to swing, and the hole site precision is improved. On the other hand, the shortening of the chisel edge 12 reduces the axial resistance formed by the chisel edge 12 due to the extrusion of the PCB board during drilling, and the head of the drill point body 10 is not easy to swing, thereby improving the hole site precision. The high-precision micro drill point 100 of the utility model increases the included angle A between the front cutter face 111 and the rear cutter face 112, so that the cutting part of the main cutting edge 11 is more wear-resistant; the chip breaker is more convenient to break and has better processing precision by additionally arranging the chip removing groove 13 at the core part, and the chip breaker is suitable for wide popularization and use.

Referring to fig. 3 to 7, in some alternative embodiments, the end of the drill point body 10 away from the shank 20 is a cutting section 101. The main cutting edge 11 and the chisel edge 12 are provided on the cutting segment 101, the cutting segment 101 is provided with a spiral groove 14 connected to the chip discharge groove 13 in a spiral manner along the circumferential surface, and the spiral groove 14 is used for discharging chips. Specifically, the chip groove 13 is located between the main cutting edge 11 and the helical groove 14, and the chip groove 13 is located near the center of the cutting section 101, so that the length of the main cutting edge 11 can be lengthened and the length of the chisel edge 12 can be shortened. It will be appreciated that the helical flute 14 is connected to the main cutting edge 11, and that a chip removal flute 13 is provided in the helical flute 14 adjacent to the main cutting edge 11 for better chip breaking and removal. The chip removal groove 13 is arranged, so that the extrusion of the main chip cutting edge 11 on a workpiece to be drilled is reduced, and chip breaking and removal are facilitated; meanwhile, the main cutting edge 11 is lengthened, the chisel edge 12 is shortened, and the drilling precision can be better provided.

Referring to fig. 3 to 5, in some alternative embodiments, one end of the chip discharge groove 13, which is communicated with the spiral groove 14, is inclined toward a direction close to the spiral groove 14, so as to better discharge chips. It can be understood that, chip groove 13 is seted up on helical flute 14 and is linked together in main cutting sword 11, through increasing a chip groove 13 for main cutting sword 11 has increased with the work piece area of contact of treating drilling, simultaneously, can reduce drill point body 10 and treat the extrusion of drilling work piece, also can be better carry out the chip removal, and the smear metal of drilling can convey the chip removal in helical flute 14 through chip groove 13. When the chip groove 13 is opened, the chip groove is inclined towards the direction of the spiral groove 14, so that chips can enter the spiral groove 14 from the chip groove 13 for chip removal. The chip groove 13 is added, chips cannot be scattered randomly by splashing on the PCB, the chip breaking effect is better, and the chips cannot be scattered randomly by crushing. The chips can enter the spiral groove 14 through the chip discharge groove 13 and then fall into a certain area, so that the chips are more convenient to clean.

Referring to fig. 4 and 5, in some alternative embodiments, the chip flute 13 and the rake surface 111 have smooth transition, so that the chips drilled by the main cutting edge 11 can better enter the chip flute 13 and be discharged through the chip flute 13 or enter the chip flute 14 through the chip flute 13. Illustratively, the flutes 13 are arcuate in configuration. Of course, the chip groove 13 may have another structure such as a concave shape, as long as the chip groove 13 can communicate with the main cutting edge 11 to discharge chips. But more preferably, the chip discharge groove 13 is of an arc structure so that chips can be discharged better and the chip discharge groove 13 can be machined more conveniently.

Referring to fig. 3-7, in alternative embodiments, flutes 13 have a depth between 15% and 20% of the diameter of drill bit body 10. It will be appreciated that the depth of the flutes 13 is designed to a reasonable extent for better cutting and evacuation. The depth of the chip flute 13 is related to the effective chip area of the main chip edge 11 and the discharge of chips. Meanwhile, as the diameter of the drill point body 10 changes, the depth of the corresponding chip discharge groove 13 also changes along with the change. The depth of the chip grooves 13 is about 15 to 20% of the diameter of the drill bit body 10.

Referring to fig. 3-7, in alternative embodiments, the length of the main cutting edge 11 is between 50% and 55% of the diameter of the drill bit body 10. Due to the fact that the chip grooves 13 are formed, the length of the main chip cutting edge 11 is increased, chips can be effectively cut, extrusion of a workpiece to be drilled is reduced, axial stress is reduced during drilling, the head of the drill point is not prone to swinging, and hole site accuracy is improved. It can be understood that the length of the main cutting edge 11 is directly related to the accuracy of the whole machining, the increased length of the main cutting edge 11 is directly related to the grooving position and size of the chip groove 13, and the forming angle and position of the chip groove 13 are more beneficial to chip discharge. The main cutting edge 11 thus increases by a length of about one seventh to one fifth of the diameter of the drill bit body 10. I.e. the length of the main cutting edge 11 is approximately between 50% and 55% of the diameter of the drill pin body 10.

Referring to fig. 3-7, in some alternative embodiments, the length of the chisel edge 12 is between 3% and 5% of the diameter of the drill bit body 10. It will be appreciated that the chip flute 13 is provided not only to lengthen the main cutting edge 11, but also to shorten the chisel edge 12. The chisel edge 12 is shortened, the axial resistance formed by extruding the PCB plate when the chisel edge 12 is drilled is reduced, and the head of the drill point is not easy to swing, so that the hole site precision is improved. The shortened length of the chisel edge 12 is directly related to the grooving position and size of the chip groove 13, and the chip groove 13 is provided with an angle and a position which are more beneficial to chip discharge. The chisel edge 12 is therefore shortened by a length of about one tenth to one eighth of the diameter of the drill body 10 compared to a chisel edge 12 without flutes 13. I.e. the length of the chisel edge 12 is approximately between 3% and 5% of the drill bit diameter.

As shown in fig. 1 to 7, the high precision micro drill point 100 of the present invention is suitable for drilling holes on a PCB, and can also be used for drilling holes on other workpieces. The high-precision micro drill point 100 comprises a cutter handle 20 and a drill point body 10 arranged on the cutter handle 20, wherein one end, far away from the cutter handle 20, of the drill point body 10 is a cutting section 101, two main cutting edges 11 are obliquely arranged at the end part of the cutting section 101, the two main cutting edges 11 are identical in structure, and a chisel edge 12 is arranged between the two main cutting edges 11. The cutting section 101 is spirally provided with a spiral groove 14 communicated with the main cutting edge 11, a chip discharge groove 13 is formed between the spiral groove 14 and the main cutting edge 11, and the chip discharge groove 13 and the rake face 111 are in smooth transition. Both the helical groove 14 and the chip groove 13 are used for chip removal. Each main cutting edge 11 includes a rake surface 111 and a flank surface 112, the rake surface 111 and the flank surface 112 intersecting at a predetermined angle of 60 ° to 78 ° to form the main cutting edge 11. The main cutting edge 11 has higher strength and the cutting edge of the main cutting edge is more wear-resistant due to the increased included angle between the rake face 111 and the flank face 112. The chip groove 13 is opened in the rake surface 111 along the longitudinal direction of the corresponding main cutting edge 11. The chip groove 13 is arranged, so that chips can be better broken, and the chips can be more conveniently discharged. At the same time, the provision of the chip flute 13 also increases the length of the main cutting edge 11 and shortens the length of the chisel edge 12. The extension of main smear metal sword 11 can be better acts on panel such as PCB or other work pieces, more is favorable to the formation of smear metal for axial atress reduces during the drilling, and the drill point head is difficult to the swing, thereby makes the hole site precision obtain promoting. On the other hand, the shortening of the chisel edge 12 reduces the axial resistance formed by extruding the PCB board when the chisel edge 12 is drilled, and the drill point head is not easy to swing, thereby improving the hole site precision. The utility model discloses a little drill point 100 of high accuracy, the cutting part of main smear metal sword 11 is more wear-resisting, is provided with chip groove 13, and the chip breaking and the machining precision of being more convenient for are better, are suitable for extensive using widely.

The above disclosure is only a preferred embodiment of the present invention, and the scope of the claims of the present invention should not be limited thereby, and all the equivalent changes made in the claims of the present invention are intended to be covered by the present invention.

Claims (10)

1. The utility model provides a little drill point of high accuracy, is applicable to and processes PCB, its characterized in that, including the handle of a knife and set up in drill point body on the handle of a knife, drill point body is kept away from the tip of handle of a knife is provided with two main smear metal sword, two main smear metal sword slope set up in the tip of drill point body, two be the chisel edge between the main smear metal sword, every main smear metal sword all includes rake face and back knife face, the rake face with back knife face is according to predetermineeing that the angle is crossing in order to form main smear metal sword, every the rake face corresponds along it the length direction of main smear metal sword has seted up the chip groove, the chip groove is used for the discharge of smear metal, borrows by the chip groove is in order to lengthen the length of main smear metal sword is shortened the length of chisel edge.

2. The high precision micro drill point according to claim 1, wherein the preset angle is between 60 ° and 78 °.

3. The high-precision micro drill point according to claim 1, wherein one end of the drill point body, which is far away from the tool holder, is a cutting section, the main cutting blade and the chisel blade are arranged on the cutting section, the cutting section is spirally provided with a spiral groove connected to the chip removal groove along the peripheral surface, and the spiral groove is used for chip removal.

4. The high-precision micro drill point according to claim 3, wherein the chip groove is located between the main cutting edge and the spiral groove, and the chip groove is located near the center of the cutting section, so that the length of the main cutting edge can be lengthened and the length of the chisel edge can be shortened.

5. The high-precision micro drill point as claimed in claim 3, wherein the chip discharge groove is communicated with one end of the spiral groove and inclines towards the direction close to the spiral groove so as to discharge chips better.

6. The high precision micro drill point of claim 1, wherein the chip flutes smoothly transition with the rake surface.

7. The high precision micro drill point according to claim 1, wherein the chip grooves are arc-shaped.

8. The high precision micro drill point of claim 1, wherein the depth of the flutes is between 15% and 20% of the diameter of the drill point body.

9. The high precision micro drill point of claim 1, wherein the length of the main cutting edge is between 50% and 55% of the drill point body diameter.

10. The high precision micro drill point according to claim 1, wherein the length of the chisel edge is between 3% and 5% of the drill point body diameter.

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