JP2020182992A - Drill - Google Patents

Abstract

To provide a drill capable of simultaneously hole boring and grinding of an inner wall of a hole there, when shaving-finishing the inner wall of the hole, by using a grinding tool such as a rotary grinder such as a luter after hole boring for removing fiber of the hole inside therefore, since there are many in a state where the fiber jumps out on the hole inside by cut-leaving the fiber, in a conventional drill composed of only a blade for cutting when boring hole in a substance on the inside such as FRP and a wood.SOLUTION: In a drill composed of an installation part 1 to be installed in a boring tool arranged on the base end side and a cutting part 2 for forming a blade for cutting the tip side, the drill 9 has a grinding part 3 between the installation part 1 and the cutting part 2.SELECTED DRAWING: Figure 1

Description

The present invention relates to a drill which is a cutting tool for drilling.

Conventionally, a drill has been generally used for drilling work.

Japanese Unexamined Patent Publication No. 2014-159092

When drilling a hole in a substance that has fibers inside, such as FRP or wood, in a conventional drill consisting only of a cutting blade, the fibers are often left uncut and the fibers are often protruding inside the hole. ..

In order to remove the fibers inside the hole, after drilling, the inner wall of the hole was scraped off using a grinding tool such as a rotary grindstone such as a leutor.
However, there are problems such as complicated change of tools and difficulty in determining the diameter due to excessive cutting inside the hole, and a drill capable of efficiently and highly accurate drilling is desired.

Therefore, it is an object of the present invention to provide a drill capable of drilling a hole and grinding an inner wall at the same time.

(1) The drill of the present invention is a drill including a mounting portion provided on the base end side and for mounting on a drilling tool, and a cutting portion provided on the tip end side and having a cutting blade formed. It is characterized in that it is a portion on the tip side of the portion and a grinding structure for grinding the inner wall of the hole is provided on the peripheral surface thereof.

(2) In such a drill, an insertion portion is provided between the attachment portion and the cutting portion, and a tubular member to be attached to the insertion portion is further provided, and the side of the tubular member. The grinding structure is provided on the peripheral surface, and the cross-sectional shape of the insertion portion and the cross-sectional shape of the tubular member in the cylinder are substantially the same, and the cross-sectional shapes thereof are around the insertion portion. It is preferable that the tubular member has a shape that prevents the tubular member from rotating.

(3) Further, it is preferable that the grinding structure is provided on the base end side of the cutting portion and on the peripheral surface thereof.

(4) Further, it is preferable that the side peripheral surface is a secondary flank surface.

(5) Further, the grinding structure is composed of powder or granular material containing at least one of diamond, cubic boron nitride, garnet, aluminum oxide and silicon carbide, which is held on the side peripheral surface to be used for grinding. Is preferable.

(6) Further, it is preferable that the grinding structure has an uneven shape formed on a side peripheral surface to be used for grinding.

(7) Further, it is preferable that the diameter of the portion where the grinding structure is provided is larger than the diameter of the portion on the tip side of the portion.

Since the drill of the present invention can drill a hole and grind the inner wall of the hole at the same time, it is possible to improve work efficiency and realize highly accurate hole drilling.

FIG. 1 is a schematic view showing an embodiment of the drill of the present invention. FIG. 2a is a schematic view showing how a tool with a drill of FIG. 1 is used to make a hole, and FIG. 2b is a schematic view showing how the inner wall of the drilled hole is ground. FIG. 3 is a schematic diagram showing another embodiment of the drill of FIG. 4a is an exploded perspective view showing still another embodiment of the drill of FIG. 1, and FIG. 4b is a perspective view showing a state in which the tubular member of FIG. 4a is inserted into the insertion portion.

(Basic structure)
FIG. 1 shows the drill of the present invention. The drill 9 shown in the figure has a mounting portion 1 provided on the base end side and for mounting on a drilling tool 4 (see FIG. 2a), and a blade 2d (main cutting edge and secondary cutting edge) provided on the tip side and for cutting. It is composed of a cutting portion 2 on which a blade) is formed. The drill 9 has a grinding structure 3 (the portion shown by the diagonal line in the figure) for grinding the inner wall of the hole 8 (see FIG. 2b) on the peripheral surface of the drill 9 as well as a portion on the tip side of the mounting portion 1. It is provided.
Here, the lateral peripheral surface includes a portion indicated by reference numeral 2a.

The grinding structure 3 is provided at a portion between the mounting portion 1 and the cutting portion 2 and on the side peripheral surface of the portion. For example, the grinding structure 3 is a powder or granular material containing at least one of diamond, cubic boron nitride, garnet, aluminum oxide, and silicon carbide held on the side peripheral surface.

The grinding structure 3 may have an uneven shape formed on the side peripheral surface instead of the powder or granular material. For example, the uneven shape includes a shape in which a plurality of ridges are provided on the side peripheral surface, a shape in which a plurality of protrusions are provided, and the like. Further, for example, instead of the ridges, a shape may be provided in which a plurality of grooves are provided on the side peripheral surface.

In the present embodiment, the material 5 (see FIG. 2a) is a substance having fibers inside, such as FRP and wood. The material may be stone, steel, plastic or the like.

(how to use)
The state of using the drill 9 of the present invention will be described with reference to FIGS. 2a and 2b. FIG. 2a shows the state before making a hole. As shown in the figure, the mounting portion 1 of the drill is coupled to the drilling tool 4. At the time of drilling, the cutting portion 2 is rotated by the drilling tool 4 and pressed against the material 5 for drilling. As a result, a hole 8 can be formed in the material 5.

FIG. 2b shows the state after the hole 8 is drilled. As shown in the figure, after the drilling is completed, the drill 9 is further pushed in so that the grinding structure 3 reaches the material 5 and the inner wall of the hole 8 is ground and finished.

In this way, since drilling and grinding of the inner wall of the hole 8 can be performed at the same time, it is possible to improve work efficiency and realize highly accurate hole drilling.

The drilling tool 4 is generally a hand drill, a drilling machine, a lathe, a machining center, or the like, but is not limited to this as long as it performs drilling.

The tip of the cutting portion 2 has a conical shape in the drawing, but when drilling a thin plate as an application, it may have a shape with a sharp center and outer circumference, which is so-called candle sharpening.

In the present embodiment, the cutting portion 2 and the grinding structure 3 are adjacent to each other, but they may be provided at intervals.

(Modification example 1)
FIG. 3 shows a modified example of the drill 9 of FIG. Since this drill is almost the same as the above-described embodiment, the same reference numerals are used for the same parts, and the description thereof will be omitted. In the drill 9a shown in the figure, the grinding structure 3 extends to the proximal end side of the cutting portion 2. Specifically, the grinding structure 3 is provided on the secondary flank surface (see reference numeral 2b) of the cutting portion 2. In the present embodiment, for example, the grinding structure 3 reaches near the middle of the cutting portion 2.
The grinding structure 3 may be provided on the main flank surface formed at the tip of the cutting portion 2.

(Modification 2)
In order to increase the effect of grinding, the diameter 3a of the portion provided with the grinding structure 3 may be larger than the diameter 2c of the cutting portion 2 (the diameter of the portion on the tip side of the grinding structure). The size does not matter because it depends on the target material and the count of the grinding structure 3, but in order to widen the hole by the grinding structure 3, it is preferable to increase the diameter by about 0.1 mm to 1.0 mm with respect to the diameter 2c.
Further, when the hole is used so as to increase the diameter, the portion provided with the grinding structure 3 may be formed in a tapered shape. Specifically, the diameter of the portion toward which the grinding structure 3 is directed is gradually increased toward the proximal end side.
In the configuration in which the grinding structure 3 is realized by the uneven shape formed on the side peripheral surface, the diameter of the grinding structure 3 is the apex of the convex portion of the uneven shape.

(Other embodiments)
FIG. 4a shows another embodiment of the drill 9 of FIG. Since the drill of this embodiment is almost the same as that of the above-described embodiment, the same reference numerals are used for the same parts, and the description thereof will be omitted. In the drill 10 shown in the figure, an insertion portion 6 is provided between the attachment portion 1 and the cutting portion 2. A tubular member 7 is inserted into the insertion portion 6.
The figure shows a state in which the tubular member 7 is removed from the insertion portion 6. The drill 10 can attach / detach the tubular member 7 to / from the insertion portion 6.
A grinding structure 3 is provided on the side peripheral surface of the tubular member 7. The cross-sectional shape of the insertion portion 6 and the cross-sectional shape of the tubular member 7 in the cylinder are substantially the same. Their cross-sectional shape is a shape that prevents the tubular member 7 from rotating around the insertion portion 6.

FIG. 4b shows how the tubular member 7 is inserted into the insertion portion 6. The tubular member 7 is inserted from the base end portion of the drill 10 and integrated. In the present embodiment, the cross-sectional shape of the mounting portion 1 of the drill 10 is substantially the same as the cross-sectional shape of the inner cylinder of the insertion portion 6 and the tubular member 7.

In the figure, the cross-sectional shapes of the insertion portion 6 and the attachment portion 1 are hexagons having the same shape, but the shape is not limited to this, and the insertion portion 6 and the attachment portion 1 may have different shapes. For example, if the cross-sectional shape of the mounting portion 1 is such that the tubular member 7 can be passed through, the tubular member 7 can be passed from the mounting portion 1 side and guided to the insertion portion 6.
A key / key groove for the purpose of preventing rotation may be provided in the insertion portion 6, and a key groove / key corresponding to the inner peripheral surface of the tubular member 7 may be provided.

Even if the grinding structure 3 is damaged due to wear or the like, the tubular member 7 can be replaced. Therefore, machining can be performed using the new grinding structure 3, and high hole accuracy can be maintained. Further, the degree of grinding can be changed by replacing the grinding structure 3 with another tubular member 7 having a different type and degree. For example, different types of tubular members 7 are used depending on the hardness of the material 5 (see FIG. 2b), the degree of surface finishing of the inner wall of the hole 8, and the like.

The above-described embodiments and modifications can be used in appropriate combinations.

(Summary)
(1) The above-mentioned drill 9 is composed of a mounting portion 1 provided on the base end side and for mounting on the drilling tool 4, and a cutting portion 2 provided on the tip side and having a cutting blade 2d formed. It is a drill, and is characterized in that it is a portion on the tip side of the mounting portion 1 and a grinding structure 3 for grinding the inner wall of the hole 8 is provided on the peripheral surface thereof.
Therefore, since a separate tool for finishing the inner wall of the hole 8 is not required, it is possible to reduce the complexity of changing the tool. By eliminating the complexity, it is possible to prevent inconvenience such as the inside of the hole 8 being cut too much and the diameter being difficult to determine, and the dimensional accuracy of the hole 8 can be improved.

(2) In such a drill 9, an insertion portion 6 is provided between the attachment portion 1 and the cutting portion 2, and a tubular member 7 to be attached to the insertion portion 6 is further provided. A grinding structure 3 is provided on the side peripheral surface of the tubular member 7, and the cross-sectional shape of the insertion portion 6 and the cross-sectional shape of the tubular member 7 in the cylinder are substantially the same. If the shape is such that the tubular member 7 is prevented from rotating around the insertion portion 6, it can be replaced with a tubular member 7 having a different type and degree of the grinding structure 3. For example, it can be replaced with one having a different degree of grinding such as rough cutting and finishing. Further, the worn grinding structure 3 can be replaced with a tubular member 7 provided with a new grinding structure 3.

(3) Further, when a grinding structure is provided on the proximal end side of the cutting portion 2 and on the peripheral surface 2a thereof, a hole is made in the cutting portion 2 on the distal end side, and the cutting portion 2 on the proximal end side is provided. Along with drilling, the inner wall of the hole can be ground. Therefore, it is possible to grind without inserting the drill 9a deep into the hole 8 to the vicinity of the mounting portion 1. Further, by providing the grinding structure 3 on the base end side of the cutting portion 2, it is not necessary to provide a space for the grinding structure 3, and the space of the drill can be saved in the length direction.

(4) Further, when the side peripheral surface is the secondary flank surface, the inner wall of the hole can be ground by the secondary flank surface. Further, it is easy to provide the grinding structure 3.

(5) Further, the grinding structure 3 is made of powder or granular material containing at least one of diamond, cubic boron nitride, garnet, aluminum oxide and silicon carbide, which is held on the side peripheral surface to be used for grinding. In the case, desired grinding can be performed according to each powder or granular material.

(6) Further, when the grinding structure has an uneven shape formed on the side peripheral surface to be used for grinding, the grinding can be performed with the uneven shape. For example, it can be roughly ground.

(7) Further, when the diameter of the portion where the grinding structure is provided is larger than the diameter of the portion on the tip side of the portion, a pilot hole is made in the cutting portion 2 and the grinding structure 3 is formed. The hole 8 can be finished while expanding the diameter to the target diameter.

1 Mounting part 2 Cutting part 2a Side peripheral surface 2b Secondary flank surface 2c Diameter of the part on the tip side of the grinding structure 2d Drill for grinding 3 Grinding part 3a Diameter of the part where the grinding structure is provided 4 Tool 5 Material 6 Insertion Part 7 Cylindrical member 8 Grinding structure 9 Drill 9a Drill 10 Drills of other embodiments

Claims (7)

A drill consisting of a mounting portion provided on the base end side and for mounting on a drilling tool, and a cutting portion provided on the tip end side and having a cutting blade formed therein.
A drill which is a portion on the tip side of the mounting portion and is provided with a grinding structure for grinding the inner wall of the hole on the peripheral surface thereof. An insertion part is provided between the attachment part and the cutting part.
It is further equipped with a tubular member to be attached to the insertion part.
The grinding structure is provided on the side peripheral surface of the tubular member.
The cross-sectional shape of the insertion portion and the cross-sectional shape of the tubular member in the cylinder are substantially the same.
The drill according to claim 1, wherein the cross-sectional shape thereof is a shape that prevents the tubular member from rotating around the insertion portion. The drill according to claim 1, wherein a grinding structure is provided on the base end side of the cutting portion and on the peripheral surface thereof. The drill according to claim 3, wherein the side peripheral surface is a secondary flank surface. The ground structure comprises powders and granules containing at least one of diamond, cubic boron nitride, garnet, aluminum oxide, and silicon carbide, which are held on a side peripheral surface to be used for grinding. The drill described in 4. The drill according to claim 1 to 5, wherein the grinding structure has an uneven shape formed on a side peripheral surface to be used for grinding. The drill according to claim 1 to 6, wherein the diameter of the portion provided with the grinding structure is larger than the diameter of the portion on the tip side of the portion.

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