JP3173944U - Drill head structure - Google Patents

Abstract

A drill head structure capable of increasing the structural strength, concentricity, and drilling accuracy of the drill head is provided.
The structure of the drill head is a small or micro drill head in which a drill blade portion 1 and a drill handle portion 2 are welded and formed. A blade 11 is installed on one side of the drill blade portion 1 of the drill head and the blade 11 is opposite. A conical surface 12 is connected to the side, and is extended obliquely outward and gradually spreads. The maximum diameter end of the conical surface 12 further extends a straight rod-shaped extending portion 13, and a corresponding connecting surface on the opposite side of the extending portion 13. 14 is installed. The welding surface 22 of the drill handle portion 2 faces the corresponding connection surface 14 to be welded, the welding surface 22 of the drill handle portion 2 extends toward the opposite side and extends the connecting portion 21, and the connecting portion 21 opposite side is inclined outward. A slanted cone surface 23 that is gradually extended and the diameter of the rod gradually widens is installed.
[Selection] Figure 3

Description

  The present invention relates to the structure of a drill head, and in particular, can improve the structural strength, concentricity, and drilling accuracy of the drill head, and the diameter and length of a predetermined size through the extended portion of the drill blade portion and the connecting portion of the drill handle portion. In this way, the drill head structure has good accuracy and quality of the hole after drilling.

Electronic products are becoming lighter and more compact in appearance and design.
For this reason, the volume of electronic products is shrinking, and the manufacturing and processing processes of various parts inside the electronic products are becoming increasingly fine.
In various electronic products, printed circuit boards for assembling and positioning electronic parts must also be reduced as electronic products become smaller, so in the printed circuit board manufacturing process, usually using a micro drill head, Drill the circuit board and connect the inner wiring of the circuit board.

In the conventional micro drill head, tungsten carbide is used as the material of the drill head, tungsten carbide is integrally formed, and this is cut to form a micro drill head.
However, this type of drill head has a relatively good hardness and has a longer service life, but the cost is too high and the cost performance of the consumable drill head is inevitably low.

On the other hand, as shown in FIG. 5, a stainless steel handle A and a tungsten carbide blade B are used, and after joining by welding or using a high-frequency heating method, it is formed into a rod shape after shrinkage and processed to form a drill head C. Some will do.
However, the drill head C composed of two kinds of materials has insufficient structural strength and is not suitable for polishing.
In addition, the concentricity of the handle A and the blade B is poor, and the accuracy and quality of the drill hole are also poor.

That is, the following drawbacks exist in actual use.
(1) Since the handle A and blade B are made of different materials, it is difficult to accurately align the two central axes at the time of connection, and the concentricity between the handle A and blade B after welding is not sufficient. Pore accuracy is poor and quality is poor.
(2) Since the strength and hardness of the handle A and the blade B are different, the grinder is severely worn when the drill head C is polished in the manufacturing process.

That is, since there is a problem in the material and structure of the drill head, how to solve the drawback of reducing the accuracy of the drill hole and lowering the quality is an issue for industry personnel.
The present invention has been made in view of the above-described drawbacks of the conventional drill head structure.

  The problem to be solved by the present invention is to adopt a new material and recycled material that are the same material for the blade part and the handle part, weld and combine them, and expand the structural strength of the blade part according to the prescribed size norm. It is to provide a drill head structure that can improve the accuracy and quality of drill holes.

In order to solve the above problems, the present invention provides the following drill head structure.
The structure of the drill head is that the new drill blade part and the recovered and reused drill handle part are polished after welding to form a small drill head or micro drill head,
The drill blade portion of the drill head includes a blade, and a conical surface is connected to the opposite side of the drill blade, and a maximum diameter end of the conical surface is connected to a drawing extension portion, and the opposite side of the connecting portion is connected to the conical surface. , Installing a corresponding connection surface, thereby welding relative to the welding surface of the drill handle,
The welding surface extends toward the opposite side, and a connecting portion is installed. On the opposite side of the connecting portion, an oblique cone surface is installed.
The maximum diameter end of the inclined cone surface extends the handle bar, and the handle bar has a diameter of 1.985 mm to 2.0 mm, which can be firmly held by the chuck of the processing tool.
Further, the concentricity of the drill blade part and the drill handle part and the accuracy of cutting the drill hole are improved by molding the extended part of the drill blade part and the connecting part of the drill handle part into a predetermined size. Achieve
The extending portion of the drill blade extends outward from the maximum diameter end of the conical surface, and the extending length is between 0.1 mm and 5 mm, thereby corresponding to the connecting portion of the drill handle portion Make up a good concentricity,
The drill blade portion is a new tungsten material (WC), and the drill handle portion is a recovered and reused tungsten material (WC), and the drill blade portion and the drill handle portion are welded and joined. This reduces the material cost of the drill head without affecting the structural strength, and can increase the structural strength of the drill head.
The drill handle portion is provided with a welding surface on one side of the connecting portion, the opposite side is connected to the smallest diameter end of the inclined cone surface, and the length of the connecting portion is between 0.1 mm and 2 mm, preferably 0.5 mm. , It can correspond to the extended part of the drill blade part, is easy to polish, can reduce wear of the grinder, can increase the concentricity of the drill blade part and the drill handle part,
Moreover, the outer diameter of the connecting portion is smaller than the outer diameter of the handle bar, and the reduction of the outer diameter of the connecting portion is smaller than the outer diameter of the handle bar by 0.002 mm to 0.2 mm, preferably the reduced size is 0.05 mm. It is.

  The structure of the drill head of the present invention is that a new material drill blade and a recycled material drill handle are joined together by welding and then polished to form a small or micro drill head. The extended portion of the drill blade, the drill handle The drill head size can be improved by increasing the drill head's structural strength, reducing drill head bias and shaking, and improving drill hole accuracy of the drill head. Weld and bond through the material and the recycled material of the drill handle, and form a small drill head or micro drill head through the grinding process to reduce the wear of the grinder of the grinding machine, increase the structural strength of the drill head, drill holes Smoother machining and extend the service life of the drill head It is possible.

It is the three-dimensional external view before this invention drill head shaping | molding. It is a side view before this invention drill head molding. It is the three-dimensional external view after this invention drill head shaping | molding. It is a side view after this invention drill head molding. It is a side view of the conventional drill head.

  The best mode for carrying out the present invention will be described below in detail with reference to the drawings.

  Three-dimensional external view before molding the drill head of the present invention, a side view before molding the drill head of the present invention, a three-dimensional external view after molding of the drill head of the present invention, FIGS. As shown in FIGS. 3 and 4, the structure of the drill head of the present invention includes a drill blade part 1 and a drill handle part 2.

  The drill blade portion 1 is made of a new tungsten material (WC), and the drill handle portion 2 is a tungsten material (WC) that is recovered and reused.

  The diameter of the drill blade part 1 before processing and polishing is larger than the diameter of the drill handle part 2.

  Polishing after welding and molding a small drill head or micro drill head.

  The new material tungsten material (tungsten carbide, WC) of the drill blade part 1 and the recovered material tungsten material (tungsten carbide, WC recycled after use) of the drill handle part 2 do not affect the structural strength of the drill head. In addition, the material cost of the drill head can be reduced.

  A drill head formed through a welding process and a polishing process includes a welding surface 22 on one side of the handle bar 24 of the drill handle portion 2.

  In order to weld to the corresponding connection surface 14 of the drill blade portion 1, the connecting portion 21 of the drill handle portion 2 and the extended portion 13 of the drill blade portion 1 are polished and molded with a reduced outer diameter.

  An inclined cone surface 23 is formed at the connecting portion 21 of the drill handle portion 2 and the connecting position of the handle bar 24.

  The oblique cone surface 23 gradually spreads outward from the connecting portion 21, extends to the maximum end position, and is connected to the handle bar 24.

  The opposite side of the connecting portion 21 is welded and joined to the extending portion 13 of the drill blade portion 1.

  Further, two symmetrical blades 11 are formed from the extending portion 13 to the opposite side, whereby the two symmetrical blades 11 spiral around the drill blade portion 1.

  In addition, a conical surface 12 that extends and extends gradually is connected between the extending portion 13 and the drill blade portion 1.

  The minimum end diameter of the conical surface 12 is connected to the blade 11, and the maximum end diameter of the conical surface 12 is connected to the extended portion 13.

  In this way, a drill head (which can be a small drill head or a micro drill head, or can be enlarged at an equivalent ratio and applied as a large drill head) including the drill blade portion 1 and the drill handle portion 2 is molded.

  Since the handle bar 24 of the drill handle portion 2 is directed toward the blade 11 of the drill blade portion 1, the work molding exhibits contraction and extension in a state of gradually reducing.

  The blade 11 of the drill blade portion 1 is polished to form two symmetrical scrap discharge grooves 111, and according to the blade 11, the drill blade portion 1 is spirally surrounded.

  The conical surface 12 and the extended portion 13 are connected to the opposite side of the blade 11, and the length of the extended portion 13 is located between the end of the maximum diameter of the conical surface 12 and the corresponding connecting surface 14. between mm and 5 mm.

  The length of the connecting portion 21 of the drill handle portion 2 to which the extending portion 13 is connected is at the minimum diameter end from the blade 11 to the inclined cone surface 23, and is between 0.1 mm and 2 mm, preferably 0.5 mm.

  Through the length of the connecting portion 21, the length can be made larger than the width of the grinding surface of the grinder corresponding to the length of the extending portion 13.

  Moreover, the drill blade part 1 and the drill handle part 2 are made of the same material (both are tungsten carbide WC), and can be easily synchronized and polished by a grinder of a polishing tool. It is possible to reduce the degree of wear and to extend the service life of the grinder.

  The corresponding connecting surface 14 of the drill blade portion 1 is used to weld and bond to the welding surface 22 of the drill handle portion 2, and then polished to form the extended portion 13 and the connecting portion 21.

  Thereby, the welding waste at the time of welding operation can be removed, and the residue of the welding waste on the drill blade part 1 or the drill handle part 2 can be prevented.

  The length of the extended portion 13 is longer than that of the connecting portion 21, and the corresponding connecting surface 14 and the welding surface 22 are close to the handle bar 24, thus increasing the welding strength between the drill handle portion 2 and the drill blade portion 1. The concentricity between the drill blade part 1 and the drill handle part 2 can be increased.

  Moreover, the structural strength after welding can be increased, whereby the blade 11 of the drill blade portion 1 is polished (a small or micro drill head needs to be rotated at a very high speed). The stability of the high-speed rotation can be maintained, and the probability of the drill blade 1 tearing can be reduced because the bias and shaking are difficult, and the accuracy of the drill hole and the quality of the hole diameter can be improved.

  Moreover, the outer diameter size of the connecting portion 21 of the drill handle portion 2 is reduced to be smaller than the outer diameter size of the handle bar 24, and the outer diameter of the connecting portion 21 is reduced from 0.002 mm to 0.2 mm from the outer diameter of the handle bar 24. As small as possible, preferably the reduction size is 0.05 mm.

  By reducing the outer diameter size of the connecting portion 21 to a slight reduction, the influence on the structural strength of the drill handle portion 2 is avoided, and when the connecting portion 21 and the drill blade portion 1 are rotated at high speed. Can be prevented, the drill blade 1 can be prevented from being broken, and the drill hole accuracy of the drill head can be improved.

  Furthermore, the diameter of the handle bar 24 of the drill handle portion 2 is larger than the diameter of the connecting portion 21, and the diameter of the handle bar 24 is between 1.985 mm and 2.0 mm.

  By forming a relatively large clamping outer diameter, when the handle bar 24 is clamped by the chuck of the processing tool, the handle bar 24 of the drill handle part 2 can be firmly clamped, and the tightness of the clamp is good. Hard to loosen or fall off.

  That is, when the drill head rotates at a high speed, the degree of swaying of the drill blade part 1 is reduced. Thus, the drill blade part 1 is less likely to be biased or swayed, improving the accuracy of the drill hole and the quality of the hole diameter. Can be made.

  The above is merely an embodiment of the present invention, and does not limit the scope of the utility model registration request of the present invention. The drill head structure of the present invention includes a new material drill blade 1 and a recycled material drill. The handle portion 2 is welded, a small or micro drill head is molded, and a predetermined length is provided through the extended portion 13 of the drill blade portion 1, and the connecting portion 21 and the handle bar 24 of the drill handle portion 2 are both set to a predetermined size. The drill head thus formed is firmly held by the chuck of the processing machine through the handle bar 24 of the drill handle portion 2, and the blade 11 of the drill blade portion 1 is biased or swayed even at high speed rotation during processing. It is difficult to improve the accuracy and quality of the drill hole, and the drill blade part 1 and the drill handle part 2 of the drill head Through the design of each part size, when welding process is performed after drill blade part 1 and drill handle part 2 are welded, it is possible to reduce the wear of grinder of polishing machine and increase the structural strength of drill head. Part 1 is less prone to tearing, is less prone to biasing and tearing, and improves the shortcomings in the processing of small or micro drill heads. All structures and devices that have these effects are included in the scope of the utility model registration claim of the present invention. The equivalent application based on the spirit of the present invention, the conversion (replacement), replacement, and increase / decrease in the number of parts are all included in the protection scope of the present invention.

When the drill head structure of the present invention is actually used, it has the following advantages.
(1) Using a new material drill blade part 1 and a recycled material drill handle part 2, welding and joining, then molding a small or micro drill head by polishing, extending part 13 of drill blade part 1, drill The diameter of the handle bar 24 is set between 1.985 mm and 2.0 mm through the connecting part 21 of the handle part 2, the handle bar 24, etc., and the phenomenon of deviation and shaking is less likely to occur when the drill head is used according to the standard size. Thus, the accuracy and quality of the drill hole can be improved.
(2) Since the drill blade part 1 and the drill handle part 2 are welded and joined with the same material (tungsten carbide, WC), the structure strength is high, the abrasive molding is easy, and the wear of the grinder of the polishing machine can be reduced.

  The names and contents of the present invention described above are only used for explaining the technical contents of the present invention, and do not limit the present invention. All equivalent applications based on the spirit of the present invention, parts (structures) conversion, replacement, and quantity increase / decrease shall be included in the protection scope of the present invention.

  The present invention has the novelty that is a requirement for utility model registration, has sufficient progress compared to similar products of the past, has high practicality, meets the needs of society, and has a very high industrial utility value. large.

DESCRIPTION OF SYMBOLS 1 Drill blade part 11 Blade 111 Waste discharge groove 12 Conical surface 13 Extending part 14 Corresponding connection surface 2 Drill handle part 21 Connection part 22 Welding surface 23 Slanted cone surface 24 Handle bar A Handle B Blade C Drill head

Claims (5)

The structure of the drill head includes a drill blade portion, a drill handle portion connected to one side of the drill blade portion,
A spiral blade for cutting is installed on one side of the drill blade part, and a conical surface extending obliquely outward and gradually expanding the rod diameter is connected to the opposite side of the blade, and the conical surface The end of the maximum diameter further extends a straight rod-shaped stretched portion, the length of the stretched portion is 0.1 mm to 5 mm, and a corresponding connection surface is installed on the opposite side of the stretched portion,
The drill handle portion is welded to the corresponding connection surface of the drill blade portion using one side, and a welding surface is provided to be connected to the corresponding connection surface, and the welding surface is directed to the opposite side, and the connection portion is formed. Stretched and connected to the opposite side of the connecting portion is an oblique cone surface extending obliquely outward and gradually expanding the rod diameter, and the length of the connecting portion from the weld surface to the oblique cone surface is 0.1 mm. ~ 2mm,
Furthermore, the maximum diameter end of the inclined cone surface extends in a straight bar shape, and the handle bar is clamped and fixed, and the diameter of the handle bar is between 1.985 mm and 2.0 mm.
The drill head structure characterized in that an outer diameter of the connecting portion is smaller than an outer diameter of the handle bar, and a reduced size thereof is between 0.002 mm and 0.2 mm. The drill blade portion is made of tungsten material,
2. The drill head structure according to claim 1, wherein the drill handle portion connected to one side of the drill blade portion is made of a tungsten material that has been collected and reused. The drill blade part is a single cutting blade or two symmetrical cutting blades,
2. The drill head structure according to claim 1, wherein the single blade or the two cutting blades surround the drill blade portion in a spiral shape. The outer diameter of the connecting portion of the drill handle portion is smaller than the outer diameter of the handle bar,
2. The drill head structure according to claim 1, wherein the reduced size is 0.05 mm.   The structure of the drill head according to claim 4, wherein a length of a connecting portion of the drill handle portion from the welding surface to a minimum diameter position of the inclined cone surface is 0.5 mm.

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