CN213437394U - Drill point with cutting groove on drill point - Google Patents

Abstract

The utility model relates to a drill point with a cutting groove on the drill point, one side of the drill point extends outwards to form a drill groove part, and the other end of the drill point part away from the drill point part is provided with two cutting blades, a concave part is formed at the center of the two cutting blades, the concave part is connected with the cutting blades to form cutting blade surfaces, the two cutting blade surfaces and the outer side surfaces of the two cutting blades are respectively provided with a first drill point, the center of the concave part is convexly provided with a second drill point with the length larger than that of the first drill point, the side surface of the second drill point is concavely provided with a plurality of cutting grooves which are arranged at intervals, an included angle is formed between the first drill point and the second drill point, the torque force generated by the contact of the drill point on the surface of a circuit board when the drill point rotates is greatly reduced because the drilling process is that the second drill point contacts with the guide and positions in advance and penetrates through the circuit board, thereby effectively avoiding the condition that the drill point generates deflection or shakes, therefore, the drilling operation is more stable, and the generation of burrs can be reduced, so that the drilling precision and the qualification rate are improved.

Description

Drill point with cutting groove on drill point

Technical Field

The utility model relates to a drill point has drill point of grooving, indicate two cutting blade lateral surfaces of drill point to be formed with first drill point respectively, and two cutting blade central authorities are equipped with the second drill point that length is greater than first drill point length, and its second drill point passes the circuit board for breaking earlier in the drilling process, and the torsion that contacts in the circuit board on the surface when making the drill point rotate reduces by a wide margin, and then promotes drilling precision and qualification rate.

Background

Under the trend of light, thin, short and small electronic products, the volume requirements of various electronic products become smaller, so that the manufacturing process of various electronic components inside the electronic products becomes more and more precise, and the volume of the printed circuit board for the electronic component group in the electronic products must be reduced, so that in the process of manufacturing the printed circuit board, a drill or a micro drill is mostly used for hole processing, and a plurality of pins of the electronic components can be inserted and then welded to form electrical connection.

Furthermore, in order to reduce the production cost, the printed circuit board, IC carrier and the like are processed simultaneously by using a plurality of stacked boards, so as to match the miniaturization and the array of the electronic component package, and the printed circuit board is continuously increased in density to meet the demand, so that manufacturers develop a High Density Interconnect (HDI) board, which has the advantages of small volume, high speed, high frequency and the like, and is widely used in personal computers, portable computers, mobile phones and Personal Digital Assistants (PDAs), and the demand for use is more and more thin, so that the difficulty of the current drilling needle in drilling is relatively increased, and the biggest problem is that the peripheral holes after drilling are not consistent in copper foil eversion.

Because the common drill point is designed to reduce the axial force of axial drilling, the drill point of the drill point is usually very thin and gradually thickens from the center of the circle to the outside, and the edges of the two blades are thick, the rotary cutting capability of the drill point is very strong, so that the drill point can be suitable for drilling operation, however, because the thickness of the high-density connecting plate is increasingly thin, if the drill point of the drill point directly props against the high-density connecting plate for drilling operation, the high-density connecting plate is easy to deform under stress, and inconsistent copper foil layer evagination burrs are generated around the hole after the blades are cut, and the cut scraps can be blocked between the drill point and the hole wall to be mutually scraped when being discharged along a chip discharge groove outwards, so that the surface of the hole wall is rough, the abrasion and damage of the blades can be accelerated when the drill point rotates at high speed, the temperature can also rise rapidly due to overlarge friction resistance, and the cooling effect is poor, in addition, the drill bit is prone to crack or break due to the glue residue generated by the hot melting of the high-temperature chips, which is the direction for those skilled in the art to find a new approach.

SUMMERY OF THE UTILITY MODEL

Therefore, in view of the above-mentioned shortcomings, the present invention provides a novel patent for designing a drill point with a cutting groove on the drill point by collecting relevant data and evaluating and considering in multiple ways.

In order to achieve the above object, the utility model adopts the following technical scheme:

a drill point with a cutting groove at the drill point is characterized in that: this drill point includes bores body portion and bores the slot part, wherein:

the drill point is provided with a drill groove part extending outwards at one side of the drill body part, two cutting blades are arranged at the other end of the drill groove part far away from the drill body part, a concave part is formed at the center of the two cutting blades, cutting blade surfaces are respectively formed at the connection part of the concave part and the cutting blades, a first drill point is respectively formed on the two cutting blade surfaces and the outer side surfaces of the two cutting blades, a second drill point with the length larger than that of the first drill point is convexly arranged at the center of the concave part, a plurality of cutting grooves arranged at intervals are concavely arranged on the side surface of the second drill point, and an included angle is formed between the first drill point and the second drill point.

Wherein the included angle is between 120 degrees and 150 degrees.

The utility model has the main advantages that one side of the drill body of the drill point extends outwards to form a drill groove part, the other end of the drill groove part far away from the drill body is provided with two cutting blades, a concave part is formed at the center of the two cutting blades, the concave part is connected with the cutting blades to form cutting blade surfaces, the two cutting blade surfaces and the outer side surfaces of the two cutting blades are respectively provided with a first drill point, the center of the concave part is convexly provided with a second drill point with the length larger than that of the first drill point, an included angle is formed between the first drill point and the second drill point, the second drill point can be contacted with the circuit board in advance to guide and position in the drilling process, and the second drill point can be utilized to penetrate through the circuit board in advance, so that the torsion generated on the surface of the circuit board when the drill point rotates can be greatly reduced, the condition that the drill point generates deflection or sways can be effectively avoided, and the whole drilling operation is more stable, and the burr can be reduced, thereby achieving the purpose of improving the drilling precision and the qualification rate.

Another advantage of the present invention is that the second drill point has a plurality of slots spaced apart from each other on the side surface, so that the second drill point can easily pass through the circuit board surface through the plurality of slots, and the plurality of slots can effectively discharge chips.

Drawings

Fig. 1 is a side view of the present invention before drilling.

Fig. 2 is a side view of the present invention after drilling.

Description of reference numerals: 1-drilling a needle; 11-a drill body part; 12-drilling a slot part; 13-a cutting blade; 131-a recess; 132-cutting edge face; 133-a first drill tip; 14-a second drill tip; 141-cutting groove; 2-a circuit board; 21-hole.

Detailed Description

To achieve the above objects and advantages, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Please refer to fig. 1 and fig. 2, which are a side view before drilling and a side view after drilling, as can be clearly seen from the drawings, the drill point 1 of the present invention includes a drill body portion 11 and a drill slot portion 12, wherein:

the drill point 1 is provided with a drill groove part 12 extending outwards at one side of a drill body part 11, two cutting blades 13 are arranged at the other end of the drill groove part 12 far away from the drill body part 11, a concave part 131 is formed at the center of the two cutting blades 13, an inclined or arc-shaped cutting blade surface 132 is respectively formed at the joint of the concave part 131 and the cutting blades 13, a first drill point 133 is respectively formed on the outer side surfaces of the two cutting blade surfaces 132 and the two cutting blades 13, a second drill point 14 with the length larger than that of the first drill point 133 is convexly arranged at the center of the concave part 131, a plurality of cutting grooves 141 arranged at intervals are concavely arranged on the side surface of the second drill point 14, an included angle theta is formed between the first drill point 133 and the second drill point 14, and the angle of the theta is between 120 degrees and 150 degrees.

Furthermore, the diameter of the drill bit 1 may be larger than 0.2mm, such as a general drill bit or a micro drill bit, and the shank 11 of the drill bit 1 may be a Straight shank (Straight) or an Undercut (Undercut) type, and may be formed integrally with or separately from the groove 12.

When the drill point 1 of the present invention is used in drilling operation, the drill point 1 can be firstly abutted against the surface of the circuit board 2, because the length of the second drill point 14 of the drill point 1 is greater than the length of the first drill point 133 of the two cutting blades 13, the drill point can be firstly contacted with the surface of the circuit board 2 for guiding and positioning, and when the drill point 1 is used in drilling, the second drill point 14 can be used for drilling in advance, and when the first drill points 133 of the two cutting blades 13 are contacted with the surface of the circuit board 2, the drill point 1 can be used for rotating to form the hole 21 which is penetrated through from top to bottom on the circuit board 2, however, the chip generated in the drilling process can be rapidly discharged by using the drill groove part 12, because the second drill point 14 can be contacted with the guiding and positioning in advance in the drilling process, and the second drill point 14 can be used for breaking through the circuit board 2 in advance, so that the torsion generated on the surface of the circuit board 2 when the drill point 1 rotates is greatly reduced, and then effectively avoid the condition that the drill point 1 produced the beat or rocked to take place, so make whole drilling processing operation more stable to the production of reducible deckle edge, thereby reach the effect that promotes drilling precision and qualification rate.

And because the plurality of slots 141 are concavely arranged on the side surface of the second drill tip 14 at intervals, the second drill tip 14 can more easily pass through the surface of the circuit board 2 through the plurality of slots 141, and the chips can be effectively discharged by using the plurality of slots 141.

The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (2)

1. A drill point with a cutting groove at the drill point is characterized in that: this drill point includes bores body portion and bores the slot part, wherein:

the drill point is provided with a drill groove part extending outwards at one side of the drill body part, two cutting blades are arranged at the other end of the drill groove part far away from the drill body part, a concave part is formed at the center of the two cutting blades, cutting blade surfaces are respectively formed at the connection part of the concave part and the cutting blades, a first drill point is respectively formed on the two cutting blade surfaces and the outer side surfaces of the two cutting blades, a second drill point with the length larger than that of the first drill point is convexly arranged at the center of the concave part, a plurality of cutting grooves arranged at intervals are concavely arranged on the side surface of the second drill point, and an included angle is formed between the first drill point and the second drill point.

2. The drill bit with a cutting slot at the drill tip of claim 1, wherein: the included angle is between 120 degrees and 150 degrees.

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