CN213437395U - Drill point with grooving structure - Google Patents

Abstract

The utility model relates to a drill point with grooving structure, two cutting blade center departments of drill point are formed with the concave part, two cutting blade terminal surfaces all have and lie in the center one side edge from the back forward cross the center extend to the opposite side and be the first blade face of form of heeling, two first blade faces respectively backward reverse oblique extension form the second blade face, the junction of two first blade faces and second blade face is formed with the first drill point that is the bulge form, two cutting blade edges respectively with the second blade face jointly the evagination have the length equal to the second drill point of first drill point length, form the contained angle between first drill point and the second drill point, the concave plural grooving that is the interval arrangement on first blade face and the second blade face side, because of the length of two second drill points of drill point equals the length of two cutting blade first drill points, can form four-point contact with the circuit board, the drilling device has the advantages that the situation of deflection or shaking is not easy to occur in the drilling process, burrs can be reduced, and the drilling precision and the qualified rate are improved.

Description

Drill point with grooving structure

Technical Field

The utility model relates to a drill point with grooving structure indicates that the first and second cutting edge face junction of two cutting blades of drill point is formed with first drill point especially, and two cutting blade outer fringe respectively with the second cutting edge face common protruding second drill point that has length to equal first drill point length of stretching, its drill point drilling in-process for form four point contact with the circuit board, and then the difficult condition that takes place the beat or rock.

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 grooving structure 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 grooving structure 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 one 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, the end faces of the two cutting blades are provided with first blade faces which are arranged at the outer edge of one side of the center and extend from the back to the front to the other side over the center, the two first blade faces respectively extend backwards and reversely to form second blade faces, first drill points are formed at the connecting positions of the two first blade faces and the second blade faces, the outer edges of the two cutting blades respectively and the second blade faces protrude outwards to form second drill points with the length equal to that of the first drill points, included angles are formed between the first drill points and the second drill points, and a plurality of cutting grooves which are arranged at intervals are formed on the side faces of the first blade faces and the second blade faces.

The drill point with the grooving structure is characterized in that: the included angle is between 90 degrees and 160 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 end faces of the two cutting blades are provided with a first blade face which is positioned at the outer edge of one side of the center and extends from the center to the other side in a side-tipping manner, the two first blade faces respectively extend backwards and reversely to form a second blade face, the joint of the two first blade faces and the second blade face is provided with a convex first drill point, the outer edges of the two cutting blades respectively protrude outwards with the second blade face to form a second drill point with the length equal to that of the first drill point, an included angle is formed between the first drill point and the second drill point, and a plurality of cutting grooves which are arranged at intervals are concavely arranged on the side faces of the first blade face and the second blade face, the length of the two second drill points of the drill point is equal to the length of the first drill points of the two cutting blades, so that four-point contact can be formed with the circuit board, the drill point is not prone to deflection or shaking in the drilling process, the whole drilling operation is more stable, the generation of burrs can be reduced, and the purposes of improving the drilling precision and the qualification rate are achieved.

Another advantage of the present invention is that the drill point is provided with a plurality of grooves on the side surface thereof, so that a plurality of grooves are formed on the inner wall of the hole through the plurality of grooves, so that the plating solution can enter the hole through the plurality of grooves when the circuit board is subsequently electroplated, thereby enhancing the adhesion between the hole and the plating solution and further improving the conductive stability of the circuit board.

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-a first blade face; 133-a second edge face; 134-a first drill tip; 14-a second drill tip; 15-grooving; 2-a circuit board; 21-holes; 211-grooves.

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, and is provided with two cutting edges 13 at the other end of the drill groove part 12 far away from the drill body part 11, and a concave part 131 is formed at the center of the two cutting edges 13, the end faces of the two cutting edges 13 are provided with a first edge face 132 which is in a side-tipping shape and extends from the front to the other side beyond the center, the two first edge faces 132 are respectively formed with a second edge face 133 extending towards the back and reversely, the joint of the two first edge faces 132 and the second edge face 133 is formed with a convex first drill tip 134, the outer edges of the two cutting edges 13 are respectively and outwards protruded with a second drill tip 14 with the length equal to the length of the first drill tip 134, an included angle theta is formed between the first drill tip 134 and the second drill tip 14, and the included angle theta is between 90 degrees and 160 degrees, a plurality of cutting grooves 15 are formed on the side surfaces of the first cutting edge surface 132 and the second cutting edge surface 133 at intervals.

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 on the surface of the circuit board 2, because the length of the two second drill points 14 of the drill point 1 is equal to the length of the first drill points 134 of the two cutting blades 13, so that four points can be contacted on the surface of the circuit board 2, when the drill point 1 is used in drilling operation, the first drill points 134 of the two cutting blades 13 and the two second drill points 14 of the drill point 1 can be commonly used for forming the holes 21 which are penetrated up and down on the circuit board 2, however, the cuttings generated in the drilling process can be rapidly discharged by using the drill slot portion 12, because the length of the two second drill points 14 of the drill point 1 is equal to the length of the first drill points 134 of the two cutting blades 13, four points can be contacted with the circuit board 2, so that the drill point 1 is not easy to generate deflection or shake in the drilling operation, thus the whole drilling operation is more stable, and the burr can be reduced, thereby achieving the effect of improving the drilling precision and the qualification rate.

And because the side of the drill point 1 is provided with the plurality of cutting grooves 15, the inner wall surface of the hole 21 is formed with a plurality of grooves 211 through the plurality of cutting grooves 15, when the circuit board 2 is subjected to subsequent electroplating operation, plating solution (such as conductive substances of copper, tin or lead and the like) can enter through the plurality of grooves 211, so that the area capable of containing the plating solution in each hole 21 is increased, and the adhesive force between the hole 21 and the plating solution is further enhanced, so that when the hole 21 of the circuit board 2 is used for inserting external conductive terminals (not shown in the figure), the plating solution is not easy to be separated and stripped due to high insertion and extraction force, and the effect of improving the conductive stability of the circuit board 2 is achieved.

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 grooving structure 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 one 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, the end faces of the two cutting blades are provided with first blade faces which are arranged at the outer edge of one side of the center and extend from the back to the front to the other side over the center, the two first blade faces respectively extend backwards and reversely to form second blade faces, first drill points are formed at the connecting positions of the two first blade faces and the second blade faces, the outer edges of the two cutting blades respectively and the second blade faces protrude outwards to form second drill points with the length equal to that of the first drill points, included angles are formed between the first drill points and the second drill points, and a plurality of cutting grooves which are arranged at intervals are formed on the side faces of the first blade faces and the second blade faces.

2. The drill bit having a kerved structure of claim 1, wherein: the included angle is between 90 degrees and 160 degrees.

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