JP3146750U - Miniature three-stage drill - Google Patents

Abstract

An ultra-compact three-stage drill is provided that increases the structural strength of an ultra-small drill and further extends the service life of the micro-drill.
One side of a handle portion (1) connects a blade portion (2) with an inclined cone-shaped cone (11), and a concave neck reduction step (211) is installed at a cutting blade position of the blade portion (2). Next, a reinforcing portion 22 having an outer diameter larger than the neck reduction step is installed between the neck reduction step 211 of the cutting blade 21 and the cone 11 of the handle portion 1. When a micro drill is drilled by rotating it at high speed with a circuit board, the concave neck reduction stage 211 reduces the friction with the hole wall and reduces the generation of resistance and high temperature. The reinforcing portion between the neck reduction step 211 and the cone of the handle portion forms a large range of connection between the blade portion 2 and the handle portion 1 to increase the structural strength. Also, when drilling on the multilayer circuit board, when drilling on the circuit board with the cutting blade 21 of the blade part 2, it is difficult to cause cracking due to the generated resistance force, and when rotating at high speed, the outer diameter of the reinforcement and the handle Due to the stable connection of the part 1, it is possible to prevent deviation and center misalignment and achieve good perforation.
[Selection] Figure 1

Description

  The present invention relates to a micro three-stage drill, and in particular, the micro drill is connected to the blade portion with an inclined cone-shaped cone on one side of the handle portion, and the blade portion is provided with a neck reduction step. Even if the drill is subjected to resistance when drilling on the multilayer circuit board, a reinforcing part is installed between the neck reduction stage of the blade part and the cone of the handle part to increase the structural strength of the micro drill. Less likely to crack.

Electronic products are gradually moving toward a small, light and small era, and the volume of various electronic products is shrinking. For this reason, the manufacturing and processing steps of various parts inside the electronic product are also relatively more precise. In addition, printed circuit boards for installing electronic components in various electronic products are also becoming smaller as electronic products are reduced. It is electrically connected by a circuit or an electronic component connecting leg connected to the inner layer. However, the volumes of the printed circuit board and the IC carrier board are reduced along with the volume of the electronic product, and multilayer circuits are overlapped and processed simultaneously in order to reduce the production cost of the manufacturing process. When a hole is made in a multilayer circuit board with a micro drill, the temperature rises due to the frictional resistance between the blade portion and the hole wall of the micro drill, and the cooling effect is poor.

FIG. 3 shows a known three-dimensional external view. As shown in the figure, the micro drill has a handle portion A of a cone A1, the handle portion A sandwiches and positions the machine base, and the handle portion A One side connects the blade part B. The blade portion B forms a connecting step B1 having a relatively small outer diameter toward the cone A1 side of the handle portion A, and reduces the outer diameter of the connecting step B1 to reduce friction with the hole wall. However, since the continuous cutting step B1 of the known blade part B and the cone A1 of the handle part A are connected within a small range, when the micro drill rotates at high speed and opens a hole in the multilayer circuit board, the multilayer circuit board A resistance force due to the thickness of the blade portion B is generated, and a crack runs between the connecting step B1 of the blade portion B and the cone A1 of the handle portion A and is easily separated. In addition, since the outer diameter of the connecting step B1 is small and the structural strength of the microminiature drill is small, when the microminiature drill rotates at high speed, the blade portion B tends to be biased at the center, and the accuracy of the drill hole of the circuit board There is a disadvantage that lowers the circuit board and raises the defective rate of the circuit board. Therefore, in order to improve the problems and shortcomings of known micro drills, related manufacturers continue to study for improvement.
Japanese Patent Publication No. 2003-525763

    The problem to be solved is that the continuous cutting step of the blade part and the cone of the handle part are connected in a small range, so when the drill rotates at high speed and drills a hole in the multilayer circuit board, the thickness of the multilayer circuit board This is because the resistance force due to the occurrence of the cracks, the cracks easily run and separate, the center of the blade portion tends to be biased, the accuracy of the drill holes in the circuit board is lowered, and the defect rate of the circuit board is increased.

The present invention includes a handle portion and a blade portion. Among them, on one side of the handle portion, the blade portion is connected by an inclined cone-shaped cone, and a concave neck reduction stage is installed at the cutting blade portion of the blade portion. Next, a reinforcing portion having an outer diameter larger than the neck reduction step is installed between the neck reduction step of the cutting blade and the cone of the handle portion. When a micro drill is drilled by rotating it at high speed with a circuit board, friction with the hole wall is reduced in the concave neck reduction stage, and resistance and high temperature are reduced. The reinforcing part between the neck reduction stage and the cone of the handle part forms a large range of connection between the blade part and the handle part, thereby increasing the structural strength. Also, when drilling on the multilayer circuit board, when drilling on the circuit board with the cutting blade of the blade part, it is difficult to cause cracking phenomenon due to the generated resistance force, and when rotating at high speed, the outer diameter of the reinforcement and the handle part The most important feature is that stable connection prevents misalignment and misalignment and achieves good perforation.
The present invention has the following features.
(1) Used for drilling a printed circuit board, consisting of a handle part and a blade part. One side of the handle part is connected to the blade part by an inclined conical cone, and the cutting blade part of the blade part has a concave shape. In an ultra-small three-stage drill that installs a neck reduction stage,
An ultra-small three-stage drill characterized in that a reinforcing part having an outer diameter larger than the neck reduction stage is installed between the neck reduction stage of the cutting blade and the cone of the handle part.
(2) The ultra-compact three-stage drill according to (1), wherein the cutting blade has an outer diameter approximately 10 to 30 μm larger than an outer diameter of the neck reduction stage.
(3) The ultra-small three-stage drill according to (1), wherein the cutting blade has an outer diameter that is about 5 to 15 μm larger than the outer diameter of the reinforcing portion.
(4) The ultra-small three-stage drill according to (1), wherein the cutting blade may have an outer diameter smaller by about 5 to 15 μm than an outer diameter of the reinforcing portion.

  The micro three-stage drill of the present invention has the advantages of increasing the structural strength of the micro drill and further extending the service life of the micro drill.

  The main object of the present invention is to provide a cone on one side of the handle portion of the micro drill, to install a blade portion on the cone, and to install a concave neck reduction stage at the cutting blade position of the blade portion. Next, a reinforcing portion having an outer diameter larger than the neck reduction step is installed between the neck reduction step of the cutting blade and the cone of the handle portion. When a micro drill drills by rotating at high speed on a multilayer circuit board, the reinforcing part between the neck reduction stage and the cone of the handle part forms a large range of connection between the blade part and the handle part. Increases the structural strength of small drills and further extends the service life of micro drills.

  In order to achieve the above-described objects and effects, the technical means and the structure adopted by the present invention will be described with reference to the drawings, and the characteristics and effects will be described below with reference to preferred embodiments.

  FIG. 1 is a three-dimensional external view of a preferred embodiment of the present invention. As shown in the figure, the ultra-small three-stage drill of the present invention includes a handle portion 1 and a blade portion 2. Of which

  An inclined cone-shaped cone 11 is formed on one side of the handle portion 1.

  The blade portion 2 is connected to one side of the cone 11, and the blade portion 2 is provided with a recessed neck reduction step 211 on the cutting blade 21, and the neck portion reduction step 211 and the cone 11 of the handle portion 1 are connected. A reinforcing portion 22 having an outer diameter larger than that of the neck reduction stage 211 is installed between them.

  FIG. 2 is an outside diameter indication diagram of a preferred embodiment of the present invention. As shown in the figure, the outside diameter D1 of the cutting blade 21 of the blade portion 2 is larger than the outside diameter D2 of the neck reduction stage 211. The outer diameter D1 of the blade part 2 is about 5 to 15 μm larger than the outer diameter D3 of the reinforcing part 22, and the outer diameter D2 of the neck reduction stage 211 is the outer diameter of the cutting blade 21 and the reinforcing part 22 It is smaller than D1 and D3. Therefore, the neck reduction stage 211 forms a concave shape on the cutting blade 21, and the handle portion 1 of the micro drill is held by a pre-installed machine base, and when it is perforated by rotating at high speed on a circuit board, the concave portion is formed. The neck reduction stage 211 reduces friction between the hole and the hole wall, reduces resistance and generation of high temperature, and prevents the hole from becoming hot. The soot generated on the hole wall of the circuit board or the protrusion of the metal weld layer of the circuit board generated by the high temperature is separated from the surface of the circuit board.

  The outer diameter D1 of the cutting blade 21 of the above-described blade portion 2 may be smaller by about 5 to 15 μm than the outer diameter D of the reinforcing portion 22. However, the outer diameter D1 of the blade portion 2 and the outer diameter D3 of the reinforcing portion 22 are both larger than the outer diameter D2 of the neck reduction step 211, and the neck reduction step 211 forms a concave shape in the blade portion 2, and then cuts. Since the reinforcing portion 22 between the neck reduction stage 211 of the blade 21 and the cone 11 of the handle portion 1 is connected in a large range between the blade portion 2 and the handle portion 1, the structural strength of the micro drill is increased. In this way, when the micro drill rotates at high speed and drills in the multilayer circuit board, the drill is not easily broken due to the resistance of the multilayer circuit board, and the space between the outer diameter D3 of the reinforcing portion 22 and the handle portion 1 is stable. Thus, the cutting blade 21 of the blade portion 2 is not deviated or deviated from the center, stably rotates at a high speed, accurate drilling can be performed, and the production rate of the circuit board is improved.

The above-described ultra-small three-stage drill of the present invention has the following advantages when actually used.
The reinforcing portion 22 between the neck reduction stage 211 of the cutting blade 21 of the blade portion 2 and the cone 11 of the handle portion 1 is connected in a large range between the cutting blade 21 and the handle portion 1, so Increased durability. As a result, when the micro drill rotates at a high speed to perforate the multilayer circuit board, even if the resistance of the multilayer circuit board is received, cracking is unlikely to occur.
Since the reinforcing portion 22 installed between the neck reduction step 211 and the cone 11 of the handle portion 1 is stably connected in a large range between the blade portion 2 and the handle portion 1, the structural strength of the micro drill is increased. When the cutting blade 21 of the blade portion 2 is rotated at a high speed and drilled, the cutting blade 21 is less likely to be biased or misaligned, and has good stability.

  The present invention mainly concatenates the blade part with a cone on one side of the handle part of a micro drill, and the neck part is provided with a cervical reduction stage, the cervical reduction stage of the cutting blade of the blade part, and the handle part When the reinforcing part is molded between the cones, the structural strength of the micro drill is effectively increased by the stable connection of the reinforcing part with the large outer diameter and the handle part. When the micro drill drills from the multilayer circuit board, The cutting blade of the blade part is less likely to cause a crack phenomenon. The above is only a preferred embodiment of the present invention, and does not limit the scope of claims of the present invention. All simple modifications and structural changes of the same effect in the description and schematic contents of the present invention are all claimed in the present invention. It shall be included in the range.

  As described above, when the ultra-small three-stage drill of the present invention is used, the effect and purpose are surely achieved. Therefore, the present invention is practical and meets the application requirements for utility model registration.

It is a three-dimensional external view of the Example of this invention. It is an outer diameter instruction | indication figure of the Example of this invention. It is a well-known three-dimensional external view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Handle part 11 Cone 2 Blade part 21 Cutting blade 211 Neck part reduction | restoration step 22 Reinforcement part A Handle part A1 Cone B Blade part B1 Connection step

Claims (4)

Used for drilling printed circuit boards, consisting of a handle part and a blade part. One side of the handle part is connected to the blade part by an inclined cone-shaped cone, and the cervical reduction step is recessed at the cutting edge of the blade part. In the micro three-stage drill that installs
An ultra-small three-stage drill characterized in that a reinforcing part having an outer diameter larger than the neck reduction stage is installed between the neck reduction stage of the cutting blade and the cone of the handle part.   2. The micro three-stage drill according to claim 1, wherein the cutting blade has an outer diameter larger by about 10 to 30 μm than an outer diameter of the neck reduction stage.   2. The micro three-stage drill according to claim 1, wherein the cutting blade has an outer diameter larger by about 5 to 15 μm than an outer diameter of the reinforcing portion.   2. The micro three-stage drill according to claim 1, wherein the cutting blade may have an outer diameter smaller by about 5 to 15 μm than an outer diameter of the reinforcing portion.

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