CN213614346U - Drill point with large outer diameter structure - Google Patents

Abstract

The utility model relates to a drill point with large outer diameter structure, the center of two cutting blades of the drill point is formed with a concave part, the concave part is connected with the cutting blades and is respectively formed with a cutting surface, two cutting surfaces and two cutting blade lateral surfaces are respectively formed with a first drill point, and the end parts of the two cutting blades are formed with heads with enlarged outer diameters, then the center of the concave part is convexly provided with a second drill point with the length equal to the length of the first drill point, an included angle is formed between the first drill point and the second drill point, because the length of the second drill point of the drill point is equal to the length of the first drill point of the two cutting blades, the drill point can form three-point contact with a circuit board, and because the outer diameter of the head of one end of the two cutting blades is larger, the contact surface can be enlarged, so that the drill point is not easy to generate the condition of deflection or shaking in the drilling process, and further the whole drilling operation is more stable, and the burr can be reduced, thereby improving the drilling precision and the qualification rate.

Description

Drill point with large outer diameter structure

Technical Field

The utility model relates to a drill point of big external diameter structure indicates that two cutting blade lateral surfaces of drill point are formed with first drill point respectively, and two cutting blade central authorities are equipped with the second drill point that length equals first drill point length, and its drill point drilling in-process is for forming three point contact with the circuit board, and then the difficult condition of taking place beat or rocking, so make whole drilling processing operation more stable.

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 large outer diameter 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:

the utility model provides a drill point of big external diameter structure which 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, first drill points are respectively formed on the two cutting blade surfaces and the outer side surfaces of the two cutting blades, heads with enlarged outer diameters are formed at the end parts of the two cutting blades, a second drill point with the length equal to that of the first drill point is convexly arranged at the center of the concave part, and an included angle is formed between the first drill point and the second drill point.

The drill point with the large outer diameter structure is characterized in that: the included angle is between 120 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 concave part is connected with the cutting blades to form cutting blade surfaces respectively, the two cutting blade surfaces and the outer side surfaces of the two cutting blades are respectively provided with a first drill point, the end parts of the two cutting blades are provided with heads with enlarged outer diameters, the center of the concave part is convexly provided with a second drill point with the length equal to the length of the first drill point, an included angle is formed between the first drill point and the second drill point, the length of the second drill point of the drill point is equal to the length of the first drill point of the two cutting blades, namely, the drill point can be in three-point contact with a circuit board, and the outer diameter of the head at one end of the two cutting blades is larger, so that the contact surface of the drill point is enlarged, and the situation that the drill point is not easy to deviate or rock in, therefore, the whole drilling operation is more stable, and the generation of burrs can be reduced, so that the aims of improving the drilling precision and the qualification rate are fulfilled.

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; 134-a head; 14-a second drill tip; 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, inclined or arc-shaped cutting blade surfaces 132 are respectively formed at the joints of the concave part 131 and the cutting blades 13, first drill tips 133 are respectively formed on the two cutting blade surfaces 132 and the outer side surfaces of the two cutting blades 13, heads 134 with enlarged outer diameters are formed at the ends of the two cutting blades 13 (L1 is larger than L2), a second drill tip 14 with the length equal to that of the first drill tip 133 is arranged at the center of the concave part 131 in a protruding mode, an included angle theta is formed between the first drill tip 133 and the second drill tip 14, and the included angle theta is 120-160 degrees.

Further, the diameter of the drill bit 1 may be a drill bit of a general type greater than 0 mm and greater than 2mm or a micro drill bit, and the drill portion 11 of the drill bit 1 may be a Straight (Straight) or Undercut (underrun) type, and may be integrally formed with or separately configured from the drill slot portion 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 equal to the length of the first drill point 133 of the two cutting blades 13, three points of contact can be made on the surface of the circuit board 2, when the drill point 1 is used in drilling, the first drill points 133 of the two cutting blades 13 and the second drill point 14 of the drill point 1 can be commonly used to form the hole 21 which is penetrated from top to bottom on the circuit board 2, however, the chips generated in the drilling process can be rapidly discharged by using the drill slot portion 12, because the length of the second drill point 14 of the drill point 1 is equal to the length of the first drill points 133 of the two cutting blades 13, three points of contact can be formed with the circuit board 2, and because the outer diameter of the head 134 at one end of the two cutting blades 13 is larger, the contact surface can be enlarged, so that the drill point 1 is not easy to swing or rock in the drilling process, therefore, the whole drilling operation is more stable, and the burr can be reduced, so that the effect of improving the drilling precision and the qualification rate 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. The utility model provides a drill point of big external diameter structure which 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, first drill points are respectively formed on the two cutting blade surfaces and the outer side surfaces of the two cutting blades, heads with enlarged outer diameters are formed at the end parts of the two cutting blades, a second drill point with the length equal to that of the first drill point is convexly arranged at the center of the concave part, and an included angle is formed between the first drill point and the second drill point.

2. The large outer diameter structure drill point of claim 1, wherein: the included angle is between 120 degrees and 160 degrees.

Images