CN210725516U - Drill point for PCB - Google Patents

Abstract

The utility model discloses a drill point for PCB, including the cutting part and the handle part of interconnect, the top of cutting part is provided with two sets of knife face structures, two sets of knife face structures are symmetrically distributed and set up, each set of knife face structure includes a main knife face, a first auxiliary knife face and a second auxiliary knife face, the main knife face, the first auxiliary knife face and the second auxiliary knife face are in fan-shaped and sequentially connected distribution and set up around the top center of cutting part; the inner end of the second auxiliary cutter face in each group of cutter face structures is connected with the inner end of the main cutter face in the adjacent cutter face structure to form a step structure; the blade part is also provided with two spiral chip grooves which are respectively matched with the main tool faces in the two groups of tool face structures to form corresponding cutting edges. The utility model provides a scheme forms the drill point through two main knife faces and specific stair structure above that, can make the drill point can not slide when drilling, and directly bore into panel, increases substantially the hole site precision.

Description

Drill point for PCB

Technical Field

The utility model relates to a PCB machining tool, concretely relates to PCB drill bit.

Background

Printed circuit boards are one of the important components of the electronics industry. Almost every kind of electronic equipment, as small as electronic watches, calculators, as large as computers, communication electronics, military weaponry systems, requires printed boards for electrical interconnection as long as there are electronic components such as integrated circuits. The PCB substrate is mostly made of insulating, heat-insulating and not-easily-bent epoxy resin and glass fiber cloth, has certain thickness and strength, can be used for mounting electronic elements and bears certain mechanical force, namely a hard board.

Mechanical drilling is used as an auxiliary industry for processing circuit boards, and a great deal of energy is invested in developing special drill bits suitable for PCB boards. Because the diameter of conventional PCB drill bit is very little to need carry out high-speed rotation when using, the ubiquitous not high problem of drilling hole site precision in the in-service use can't satisfy the market demand.

Therefore, the problem to be solved in the art is to provide a high-precision drill bit suitable for a PCB.

SUMMERY OF THE UTILITY MODEL

To the problem that conventional PCB drill bit exists in practical application process, the utility model aims to provide a drill point for PCB of high accuracy to overcome the problem that prior art exists.

In order to achieve the above object, the utility model provides a drill point for PCB, including the cutting part and the handle portion that interconnect, the top of cutting part is provided with two sets of knife face structures, two sets of knife face structures are symmetrically distributed and set up, and each set of knife face structure includes a main knife face, a first auxiliary knife face and a second auxiliary knife face, the main knife face, the first auxiliary knife face and the second auxiliary knife face are in fan-shaped consecutive distribution and set up around the top center of cutting part; the inner end of the second auxiliary cutter face in each group of cutter face structures is connected with the inner end of the main cutter face in the adjacent cutter face structure to form a step structure; the cutting edge is further provided with two spiral chip grooves, and the two spiral chip grooves are matched with the main tool faces in the two groups of tool face structures respectively to form corresponding cutting edges.

Furthermore, the cutting edge on the main tool face consists of a straight edge part and a concave edge part, the straight edge part is distributed at the free end part of the main tool face, and the concave edge part extends to the connecting part of the main tool face and the second auxiliary tool face from the straight edge part.

Furthermore, the edge of the main knife face is provided with a cutting edge.

Further, the concave blade portion is arc-shaped as a whole.

Furthermore, an obtuse included angle is formed between the first auxiliary cutter face and the second auxiliary cutter face in each cutter face structure.

Furthermore, two spiral chip grooves on the blade are symmetrically arranged.

The utility model provides a scheme forms the drill point through two main knife faces and specific stair structure above that, can make the drill point can not slide when drilling, and directly bore into panel, increases substantially the hole site precision.

Moreover, this take scheme through every group knife face structure in two subsidiary blade personally submit obtuse contained angle setting, this chip removal space that makes the brill point portion increases, makes the smear metal smoothly discharge.

Drawings

The invention is further described with reference to the following drawings and detailed description.

FIG. 1 is a view showing the structure of a drill point for PCB in the present example;

FIG. 2 is a schematic view of the main body of the drill point blade for PCB in the present example;

FIG. 3 is a top view of the drill point blade for PCB in this example.

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, there is shown an example of the structure of the drill point for PCB given in this example. As can be seen, the drill bit is composed of two parts, i.e., a drill bit blade 10 and a drill bit shank 20.

In a specific configuration, the drill shank 20 is formed in a cylindrical shape as a whole, has the same outer diameter as the maximum outer diameter of the drill blade 10, and is connected to the rear end of the drill blade 10 to form a drill.

The blade part 10 in the drill bit is used for realizing a specific cutting function. The blade 10 is provided with 2 symmetrical and same-angle spiral chip grooves 11 and 12 along the extending direction, the two spiral chip grooves 11 and 12 are spirally distributed along the extending direction of the blade 10 from the top of the blade 10, and the angle range is 20-50 degrees.

Referring to fig. 2 and 3, a cutting structure is formed at the top of the blade 10, and mainly comprises two sets of tool face structures which are matched.

Preferably, the two groups of the knife faces have the same structure and are distributed in a central symmetry mode. Each group of knife face structure is in fan-shaped distribution.

Specifically, the first group of tool face structure is mainly formed by matching a first main tool face 13, a first auxiliary tool face 14 and a second auxiliary tool face 15; the second group of blade surface structures mainly comprises a second main blade surface 16, a first auxiliary blade surface 17 and a second auxiliary blade surface 18 which are matched.

Since the first set of blade face structures is the same as the second set of blade face structures, the first set of blade face structures will be specifically described as an example.

In the first set of rake face structure, the first main rake face 13, the first auxiliary rake face 14, and the second auxiliary rake face 15 are sequentially arranged in a fan-shaped manner around the top center 30 of the blade portion, thereby forming a fan-shaped rake face structure.

On the basis, the inner end of the second auxiliary tool face in each group of tool face structures is connected with the inner end of the main tool face in the adjacent tool face structure to form a step structure.

That is, the inner end of the second minor rake surface 15 in the first set of rake surface structure is connected with the inner end of the second major rake surface 16 in the second set of rake surface structure, and the connecting structure is a step structure 19 (as shown in fig. 2); while the inner end of the second minor rake surface 18 of the second set of rake surface structures is connected to the inner end of the first major rake surface 13 of the first set of rake surface structures and the connecting structure is a step structure (not shown in the figure).

In the cutting structure formed in this way, the first main tool face 13 and the second main tool face 16, which are symmetrically distributed at the central point, are respectively matched with the top center of the blade part 10 through the step structures at the inner ends thereof to form a drill tip 30 (namely, the top center part), so that the drill tip cannot slide when drilling, and the drill tip can directly drill into a plate, thereby having a great effect on improving the hole position precision.

On this basis, be the contained angle setting between the first face of a knife and the second of assisting in every group knife face structure in this example, form an contained angle obtuse angle A between specific first face of a knife and the second of assisting, and the preferred 130 ~ 160 of angle, this makes the chip removal space increase of brill point portion, makes the smear metal smoothly discharge.

Further, the first and second rake faces 13 and 16 at the top of the blade form corresponding blades with the helical flutes 11 and 12, respectively.

Taking the first rake face 13 as an example, the edge portion 131 is formed in front of the first rake face 13 and the spiral flute 11 in this example, and the edge portion 131 is composed of a straight edge portion 132 and a concave edge portion 133.

Specifically, the straight edge portion 132 is distributed at the outer end (i.e., the free end) of the first major blade surface 13, and the straight edge portion 132 is preferably in a sharp structure.

The concave edge 133 is formed in an arc shape and extends from the straight edge 132 to the inner end of the first major surface 13. And the recessed edge 133 is preferably a blunted structure.

Further, the straight length of the straight blade 132 is preferably 1/10-1/2 of the straight length of the concave blade 133 to improve the cutting effect of the blade 131. However, the present invention is not limited thereto, and other arrangements may be adopted as needed.

Meanwhile, the blade part scheme formed on the second major blade surface 16 is the same as above, and is not described herein.

In the drilling process, the straight edges on the first main tool surface 13 and the second main tool surface 16 are firstly used for processing a plate, and the concave edges are used for processing the plate, so that the abrasion of the drilling surface of the drill bit is reduced, the straight edge parts are sharper, and the concave edge parts are duller, so that the breakout angle of the drill bit is not easily caused in the plates with higher hardness.

Further, in this example, a margin (or ridge) 40 is provided at the edge of each major blade surface, and the margin (or ridge) 40 is provided from the outer edge of each major blade surface in the extending direction of the spiral flute matched with the major blade surface.

The cutting edge (or ridge) 40 is designed to have the same width in the extending direction, and a plurality of heat dissipation teeth can be arranged on the cutting edge (or ridge) 40 according to the requirement, and the heat dissipation teeth can be distributed in a uniform distance mode or a gradually increasing distance mode.

The structure can effectively discharge heat generated during drilling, and simultaneously, the friction between the drill point and the hole wall is reduced, so that good hole wall quality can be ensured.

In addition, at least one annular protrusion or annular groove can be arranged on the drill bit shank 20 according to requirements, so that the drill bit can be connected and fixed with the operating device conveniently, and the reliability in use is guaranteed. The annular bulges or the annular grooves are distributed on the drill bit shank along the circumferential direction of the drill bit shank, and if the number of the annular bulges or the annular grooves is multiple, the annular bulges or the annular grooves are distributed in groups.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. 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 (6)

1. The drill point for the PCB comprises a cutting part and a handle part which are connected with each other, and is characterized in that two groups of knife face structures are arranged at the top of the cutting part and are symmetrically distributed, each group of knife face structures comprises a main knife face, a first auxiliary knife face and a second auxiliary knife face, and the main knife face, the first auxiliary knife face and the second auxiliary knife face are sequentially distributed in a fan-shaped manner around the center of the top of the cutting part; the inner end of the second auxiliary cutter face in each group of cutter face structures is connected with the inner end of the main cutter face in the adjacent cutter face structure to form a step structure; the cutting edge is further provided with two spiral chip grooves, and the two spiral chip grooves are matched with the main tool faces in the two groups of tool face structures respectively to form corresponding cutting edges.
2. 2. The drill point for PCB according to claim 1, wherein the cutting edge on the main blade face is composed of a straight edge part and a concave edge part, the straight edge part is distributed on the free end part of the main blade face, and the concave edge part extends from the straight edge part to the connection part with the second auxiliary blade face on the main blade face.
3. 3. The drill point for PCB as claimed in claim 2, wherein the concave blade portion is formed in a circular arc shape as a whole.
4. 4. The drill point for PCB according to claim 1, wherein the edge of the major blade surface is provided with a margin.
5. 5. The drill point for the PCB according to claim 1, wherein the first minor face and the second minor face of each set of the face structures form an obtuse included angle therebetween.
6. 6. The drill point for PCB as claimed in claim 1, wherein the two spiral flutes on the blade are symmetrically disposed with respect to each other.

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