TWM510205U - Improved structure of micro drill - Google Patents

Description

Structural improvement of micro drill bits

The present invention provides a structural improvement of a micro drill, in particular, the first tapered section of the handle is a second tapered section that is butted with a blade, and the length of the second abutment surface extending to the front end of the blade is 3~ 4mm, can effectively shorten the overall length, so that the center of gravity of the blade is stable at high speed and is not easy to yaw or shake due to centrifugal force.

According to the trend of light, thin, short and small electronic products, the volume of various electronic products is gradually shrinking. Therefore, the manufacture and processing of various components inside electronic products are relatively more sophisticated and electronic. The printed circuit board (PCB) with the set of electronic components in the product must also be reduced in size with the electronic product. Therefore, in the manufacturing process of the printed circuit board, the micro drill is usually used to drill holes in the circuit board. It is used to connect the inner layer of the circuit board or to connect the pins of the electronic component to form an electrical connection.

However, the general micro-drills have a drill shank that can be clamped and fixed by a drill or a drill press, and a drill edge is provided at the front end of the drill shank. Since the diameter of the drill blade is much smaller than the drill shank, when the micro drill bit is high speed When the drilling of the circuit board is performed, it is easy to cause the yaw or sway of the center axis of the drilling edge, so that the drilling blade forms a large frictional resistance and a lateral force when drilling, which not only causes the hole position. Offset or enlargement of the aperture will also result in wear and damage to the cutting edge, shortening the service life, or even causing breakage.

However, the applicant of this case has developed a micro drill bit for the above-mentioned problems of insufficient drilling precision and product defect rate due to yaw generated when the cutting edge rotates at high speed. Please refer to the third figure, where the micro drill bit is shown. A includes a shank A1, a connecting portion A2 and a cutting edge A3, and a taper portion A11 and a connecting surface A111 on the end surface of the taper portion A11 are provided on the side of the shank A1, and the connecting portion A2 is provided at one side. Abutting taper A21 having the same angle of inclination as the taper portion A11, and abutting surface A211 for abutting and joining the connecting surface A111 on the end surface of the butting taper A21, and the other side of the connecting portion A2 with respect to the butt taper A21 The beveled portion A31 of the cutting edge A3 is provided, and the diameter of the abutting surface A211 of the butt taper A21 can be 60%~90% of the diameter of the shank A1, and the length of the cutting edge A3 to the abutting surface A211 is 8.9mm~11.9. Mm, can improve the overall structural strength, so that the micro drill A is not easy to break when drilling, but because the micro drill A actually cuts the drilled part only the cutting edge A3, the connecting part A2 will increase the drilling edge A3 extends to the length of the abutting surface A211, and when the micro drill bit A rotates at a high speed It will still cause the yaw or sway of the cutting edge A3 due to the centrifugal force, which makes the overall drilling processing operation unstable, and will also affect the precision of the drilling of the circuit board, so that the product defect rate cannot be effectively reduced, that is, to engage in this trip. The industry is eager to study the direction of improvement.

Therefore, in view of the above-mentioned problems and shortcomings, the new creators have collected the relevant materials through various evaluations and considerations, and have used the trial and modification of many years of R&D experience in this industry to design the structure of such micro-bits. A new type of improvement was born.

The main purpose of the present invention is to provide a first tapered section having a tapered shape at the front end of the handle, and a first abutting surface formed on the front end surface of the first tapered section, and the blade phase A divergent second tapered section having the same angle of inclination as the first tapered section is disposed adjacent to the handle, and a handle is formed on the rear end surface of the second tapered section to be abutted on the first mating surface The second abutting surface is integrated with the blade portion. When the micro drill bit is drilled, the length of the front end of the blade portion extending to the second abutting surface is 3~4 mm, thereby effectively shortening the overall length, so that the blade portion rotates at a high speed. The center of gravity remains stable and is not prone to yaw or sway due to centrifugal force, so as to reduce the position of the hole or break the needle, so that the overall drilling operation is more stable, thereby improving the accuracy and yield of the drilling, and The length of the blade is shortened and the quality is light, which also saves the cost of materials.

1‧‧‧ handle

11‧‧‧First cone

111‧‧‧First docking surface

2‧‧‧blade

21‧‧‧Second tapered section

211‧‧‧ second docking surface

A‧‧‧Micro drill

A1‧‧‧ drill handle

A11‧‧‧ cone

A111‧‧‧ connection surface

A2‧‧‧Connecting Department

A21‧‧‧Docking cone

A211‧‧‧ docking surface

A3‧‧‧Drill

A31‧‧‧Bevel

The first figure is a side view of a preferred embodiment of the creation.

The second drawing is a perspective exploded view of the preferred embodiment of the present invention.

The third figure is a side view of a conventional micro drill.

In order to achieve the above objectives and effects, the technical means and its construction adopted in the present invention are described in detail in the preferred embodiment of the present invention, and the structure and function are as follows.

Please refer to the first and second figures, which are respectively a side view and an exploded perspective view of a preferred embodiment of the present invention. It can be clearly seen from the figure that the micro drill bit of the present invention includes a handle 1 and a handle 1 a blade portion 2 extending from the front end, wherein the handle portion 1 is provided with a first tapered portion 11 which is tapered at a leading angle, and a first butt joint is formed on the front end surface of the first tapered portion 11 The face 111 is adjacent to the front end of the handle 1 and is provided with a divergent second tapered section 21 having the same angle of inclination as the first tapered section 11, and the rear end face of the second tapered section 21 Docking The second mating surface 211 is integrated on the first mating surface 111, and the length of the front end of the blade portion 2 extends to the second mating surface 211 is 3~4 mm.

Furthermore, the handle 1 of the present invention is preferably made of stainless steel, and the blade 2 can be made of tungsten carbide, high-speed steel or other metal materials, and the first cone of the handle 1 can be used. The second segment 26 of the segment 11 and the blade portion 2 are located on the same central axis, and the first abutting surface 111 of the first tapered segment 11 and the second abutting surface 211 of the second tapered segment 21 abut each other. The stickers are then combined into one by welding, strong adhesive, high-frequency heating or laser welding.

However, the diameter ratio of the handle portion 1 and the first abutting surface 111 of the first tapered portion 11 may be D: d1, and the ratio may be 5:3 to 10:9, that is, the diameter of the first mating surface 111 is The diameter of the shank 1 is 60% to 90%. If the shank 1 has a diameter of 2 mm, the first abutting surface 111 may have a diameter of 1.2 to 1.8 mm, preferably a diameter of 1.5 mm, and the first tapered section 11 The first abutting surface 111 and the second abutting surface 211 of the second tapered section 21 of the blade portion 2 are combined with each other, so that the first abutting surface 111 and the second abutting surface 211 have the same diameter, and the front end of the blade portion 2 The length L of the second abutting surface 211 is 3~4 mm, and the first tapered section 11 and the second tapered section 21 have a guiding angle θ of 12-20 degrees, preferably 15 degrees; In addition, the ratio of the diameter of the shank 1 and the blade 2 may be D:d2, and the ratio may be 4:1 to 10:4.5, that is, the diameter of the blade 2 is 25% to 45% of the diameter of the shank 1, if it is a shank When the diameter of the portion 1 is 2 mm, the diameter of the blade portion 2 may be 0.5 to 0.9 mm, and the diameter of the blade portion is preferably 0.7 mm. Any simple modification and equivalent structural change using the contents of the present specification and drawings should be included in the same reason. Within the scope of this creation patent Close to Chen.

When the micro drill bit of the present invention is used, the handle 1 is first mounted on a fixture provided on a drilling machine, a drill press, etc., and the handle portion 1 is rotated at a high speed to cause the blade portion 2 to be drilled on the surface of the circuit board for cutting. The drilling operation, that is, the diameter of the shank 1 is larger than the diameter of the blade portion 2, and has a good structural strength, and the first tapered portion 11 of the shank 1 is different from the second tapered portion 21 of the blade portion 2 The function of the diameter connection makes the blade portion 2 less susceptible to wear or breakage due to the frictional resistance of the circuit board.

In the process of drilling a micro drill, since the number of revolutions per minute is up to 300,000 revolutions (RPM) or more, yaw or sway is easily generated, and the front end of the blade 2 can be extended to the second tapered section 21 The length of the second abutting surface 211 is 3~4 mm, which effectively shortens the overall length, so that the center of gravity of the blade portion 2 is stable when it is rotated at a high speed, so as to effectively solve the problem that the micro-bit is easy to be yawed or shaken due to centrifugal force, and the blade portion 2 can be reduced. The frictional resistance and lateral force between the wall of the circuit board and the hole wall of the circuit board make the overall drilling operation more stable, and can also reduce the position of the hole or the broken needle, so as to effectively extend the service life of the micro drill bit, and The length of the blade portion 2 is shortened and the quality is lightened, which can effectively save the use cost of the material, and the center of gravity of the blade portion 2 remains stable and is not easy to yaw, and can effectively reduce the wear and damage of the blade portion 2, and the precision of drilling the circuit board. Improve, and thus achieve the effect of improving drilling accuracy and yield.

The above detailed description is intended to illustrate a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and other equivalents and modifications may be made without departing from the spirit of the invention. Changes are to be included in the scope of patents covered by this creation.

In summary, the structure of the above-mentioned micro-drill is improved to achieve its efficacy and purpose. Therefore, this creation is a practical and excellent creation, which is in line with the new patent. Apply for the requirements, and apply in accordance with the law. I hope that the trial committee will grant the case as soon as possible to protect the hard work of the new creators. If there is any doubt in the bureau, please do not hesitate to give instructions. The new creators will try their best to cooperate with them.

1‧‧‧ handle

11‧‧‧First cone

111‧‧‧First docking surface

2‧‧‧blade

21‧‧‧Second tapered section

211‧‧‧ second docking surface

Claims (6)

A structural improvement of a micro drill includes a shank portion and a blade extending at a front end of the shank, wherein the front end of the shank is provided with a first tapered section having a tapered shape and a first tapered shape a first abutting surface is formed on the front end surface of the segment, and the blade portion is adjacent to the shank portion, and is provided with a divergent second tapered portion having the same angle of inclination as the first tapered portion, and the second tapered portion is A second abutting surface that is integrally joined to the first abutting surface is formed on the side end surface, and a length of the front end of the blade portion extending to the second abutting surface is 3 to 4 mm. The structural improvement of the micro drill according to claim 1, wherein the first abutting surface of the shank and the second abutting surface of the blade are integrated by welding, strong adhesive or high frequency heating. The structural improvement of the micro drill according to claim 1, wherein the first abutment surface of the handle has a diameter of 60% to 90% of the diameter of the handle. The structural improvement of the micro drill according to claim 1, wherein the first abutting surface of the shank and the second abutting surface of the blade have a diameter of 1.2 to 1.8 mm. The structural improvement of the micro drill according to claim 1, wherein the first tapered section of the handle and the second tapered section of the blade have a lead angle of 12 to 20 degrees. The structural improvement of the micro drill according to claim 1, wherein the diameter of the blade is 25% to 45% of the diameter of the handle.