JP2002126922A - Drilling flaw preventing tool and holder for drill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drilling flaw preventing tool to keep facility of a drill in an excellent state and prevent the occurrence of a flaw to a work. SOLUTION: A cap-form drilling flaw preventing tool 50 is removably mounted on the tip part of a drum body 20. The drilling flaw preventing tool 50 comprises an annular side wall 54; and a bottom wall 56 continued from the tip side of the side wall 54. A hole 58 having an inside diameter approximately the same as the outside diameter of a drill blade 32 but slightly larger than the outside diameter is formed in the central part of the bottom wall 56. When a work 40 is cut as the drill blade 32 is rotated, an outer peripheral surface 32a of the drill blade 32 is adjusted to size approximately equal to an inner peripheral surface 58a of the hole 58.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling and scratch preventing tool used for cutting a metal workpiece such as aluminum and an aluminum alloy, and a drill for mounting the drilling and scratch preventing tool. Regarding the holder.

[0002]

2. Description of the Related Art Conventionally, air drills and electric drills for cutting metal workpieces have been widely used. These air drills and the like are roughly classified into a main body part held by an operator and a drill holder (mounting tool) detachably mounted on the main body part. The drill holder is rotatably mounted with a drill blade that cuts the workpiece by directly contacting the workpiece while rotating.

[0003] When a workpiece is cut by a drill blade, the drill blade rotates and advances to the tip side while rotating, thereby generating a large number of chips. The generated chips often remain around the drill bit. The remaining chips rotate with the rotation of the drill blade and come into contact with the workpiece. When the workpiece is made of a hard material such as steel, even if the workpiece comes into contact with cutting chips, it is not damaged. However, when the workpiece is made of a relatively soft material such as aluminum or an aluminum alloy, cuttings come into contact with the workpiece and are scratched.

[0004] In this case, since the chips are also rotating together with the drill blade, the workpiece is not only scratched at one place but also countless. In order to remove such a myriad of scratches, usually, the scratched portion is manually polished, so that a very long operation time is required, and the operation cost is correspondingly increased.

As a technique for preventing a workpiece from being damaged,
2. Description of the Related Art There is known a technique in which a drill blade blows air toward a portion where a workpiece is being cut and blows off generated chips with air (see Japanese Utility Model Laid-Open No. 52-10684).

[0006]

However, in the above technique, chips may not be completely blown off by air and may remain. The remaining chips rotate with the drill bit and damage the workpiece. Further, in the above-described technique, it is necessary to provide a pipe or the like for blowing air to the air drill.
For this reason, the number of parts of the air drill increases and the usability deteriorates.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide an anti-drilling tool and a holder for a drill, which maintain good usability of the drill and prevent the workpiece from being damaged.

[0008]

According to a first aspect of the present invention, there is provided a drill for preventing a hole from being drilled. The drill has a drill blade rotatably attached to a tip end thereof while rotating. Cutting chips generated by the drill blade, which are attached to the tip of the holder, are guided to the rear end side of the drill blade.

According to a second aspect of the present invention, there is provided a drilling / flaw preventing device for rotating a drill holder, which is rotatably mounted with a drill blade which advances to the distal end while rotating. A hole having a diameter substantially equal to the outer diameter of the drill bit is formed in the portion, and an inner peripheral surface of the hole is close to an outer peripheral surface of the drill blade.

[0010] Here, (3) the perforation preventing device may be one that is pressed against the workpiece while the drill bit is rotating and cutting the workpiece.

According to a first aspect of the present invention, there is provided a drill holder in which a drill blade rotatably mounted to a tip end thereof while rotating is mounted. It is characterized in that it is provided with an anti-drilling tool fixed to the tip of the drill blade, which guides the chips generated by the blade to the rear end side of the drill blade.

According to a second aspect of the present invention, there is provided a drill holder in which a drill blade rotatably mounted to a tip end side while rotating is mounted. A hole having substantially the same diameter as the outer diameter of the drill is formed, and an inner peripheral surface of the hole is provided near the outer peripheral surface of the drill blade, and a hole-piercing / scratch preventive device is provided at a tip end thereof. It is assumed that.

[0013] Here, (6) the hole piercing / flaw preventing device may be pressed against the workpiece while the drill bit is rotating and cutting the workpiece.

Further, the drill holder may have (7) a body in which the above-mentioned hole-cutting / flaw-preventing device is fixed at the tip end and an opening is formed at the rear end side from the tip end. Good.

[0015]

Embodiments of the present invention will be described with reference to the drawings.

Referring to FIGS. 1 to 3, a drill holder and a hole-break preventing device will be described. FIG. 1 is a perspective view showing a drill holder and a hole piercing / flaw preventing device. FIG. 2 is a plan view of a drill holder having a drilling / flaw preventing device fixed to the distal end thereof, as viewed from the distal end side. FIG. 3A is a front view showing a hole damage preventing device, and FIG. 3B is a front view of FIG.
It is A sectional drawing.

The drill holder 10 is mounted on a drill body (not shown) held by an operator. The drill holder 10 includes a body 20 having a substantially cylindrical shape,
A rotary connecting shaft 30 extending longitudinally at the radial center
It is composed of A rear end portion 22 in the longitudinal direction of the body 20 is fitted into and fixed to the drill body.

A male screw 24 is formed at the tip of the body 20. A female screw 52 of a hole damage prevention tool 50 described later is screwed to the male screw 24. A large pair of openings 2 is provided in a portion of the body 20 slightly rearward of the male screw 24.
6, 26 are formed. From these openings 26, 26,
Chips are dispensed as described below.

The body 20 is provided with a rotatable connecting shaft 30 extending in the longitudinal direction at the center in the radial direction. The tip of the rotary connecting shaft 30 is a drill blade 32
It has become. A plurality of spiral grooves 32b are formed on the outer peripheral surface 32a of the drill blade 32. A projection 34 for adjusting the cutting position is formed at the center of the tip of the drill blade 32. By rotating the rotary connection shaft 30 with air or the like, the drill blade 32 is rotated and directly contacts the workpiece 40 (see FIG. 4) to cut the workpiece 40. This cutting process is described in FIGS.
It will be described later with reference to FIG. At the tip end of the body 20, a cap-shaped hole-piercing / scratch protection device 50 is detachably mounted. The hole piercing / flaw preventing device 50 includes a ring-shaped side wall 54.
And a bottom wall 56 that is continuous from the tip of the side wall 54. A female screw 52 is formed on the inner peripheral surface of the side wall 54. The female screw 52 and the male screw 24 of the body 20 are screwed into each other, so that the body 20 is fitted with the hole prevention device 50 and fixed.

At the center of the bottom wall 56, there is formed a hole 58 having an inner diameter which is substantially the same as the outer diameter of the drill bit 32, but is slightly larger than the outer diameter. When the workpiece 40 is cut while the drill blade 32 rotates, the outer peripheral surface 32 a of the drill blade 32 approaches the inner peripheral surface 58 a of the hole 58.

The manner in which the drill blade 32 cuts the workpiece 40 will be described with reference to FIGS.

FIG. 4 is a partial sectional view showing a drill holder immediately before cutting a workpiece. FIG. 5 is a partial cross-sectional view showing a drill holder during cutting of a workpiece.

In cutting the workpiece 40 with the drill blade 32, first, as shown in FIG. 4, the projections 3 of the drill blade 32 are inserted into positioning holes 42 formed in the workpiece 40.
Insert 4. Thereby, the cutting position is determined. Next, the drill body (not shown) is pushed toward the workpiece 40 so that the body 20 approaches the workpiece 40. As a result, as shown in FIG.
Is pressed against the surface (work surface) of the work material 40.
For this reason, the bottom wall 56 is in close contact with the workpiece 40, and there is no gap between them.

In this state, the rotary connecting shaft 30 is pushed down to start rotating. For this reason, as shown in FIG. 5, the outer peripheral surface 32a of the drill blade 32 rotates while approaching the inner peripheral surface 58a of the hole 58, and the workpiece 40 is cut to generate chips 44. The generated cuttings 44 pass through the gap (part of the hole 58) between the outer peripheral surface 32 a of the drill blade 32 and the inner peripheral surface 58 a of the hole 58 and the groove 32 b as the drill blade 32 rotates, and 32 to the rear end side. Therefore, the chips 44 are quickly separated from the workpiece 40, and the chips 44
It does not rotate while rotating with the drill blade 32 while being adhered to the workpiece 2 and does not damage the workpiece 40.

Chips 44 guided to the rear end side of the drill blade 32
Is dropped out of the opening 26 of the body 20. Since the dropped chips 44 are stationary on the surface of the workpiece 40, they do not damage the workpiece 40. Note that a dish-shaped hole may be formed in the workpiece 40 by cutting the workpiece 40, or a through-hole may be formed.

As described above, with a simple configuration in which the drilling / scratch preventive device 50 is simply attached to the tip of the drill holder 10, it is possible to prevent the cuttings 44 from damaging the workpiece 40. Good usability is maintained.

[0027]

As described above, according to the first drilling / scratch preventer of the present invention, the chips generated when the drill blade advances while rotating and processing the workpiece are removed after the drill blade. It is led to the end side. Therefore, the chips are quickly separated from the workpiece, and do not rotate together with the drill blade while the chip remains attached to the drill blade. Therefore, the generated chips do not come into contact with and damage the workpiece. In addition, since the hole piercing prevention tool is merely attached to the tip of the drill holder, the drill has a simple configuration, and the usability of the drill is kept good.

Further, according to the second drilling / flaw preventing device of the present invention, the inner peripheral surface of the hole formed in the drilling / flaw preventing device is close to the outer peripheral surface of the drill bit. The chips generated when rotating and processing the workpiece while rotating move through the hole to the rear end side of the drill blade with the rotation of the drill blade. Therefore, the chips are quickly separated from the workpiece, and do not rotate together with the drill blade while the chip remains attached to the drill blade. Therefore, the generated chips do not come into contact with and damage the workpiece. In addition, since the hole piercing prevention tool is merely attached to the tip of the drill holder, the drill has a simple configuration, and the usability of the drill is kept good.

In the case where the drill bit is pressed against the workpiece while the workpiece is being cut while rotating, the hole flaw preventing tool is pressed against the workpiece. Therefore, a gap is not formed between the drilling / scratch protection tool and the workpiece, and the chip is moved (guided) to the rear end side of the drill blade almost simultaneously with the generation of the chip. For this reason, the generated cuttings are quickly separated from the workpiece without any contact with the workpiece. Therefore, the generated chips do not come into contact with and damage the workpiece.

Further, in the first drill holder of the present invention, a hole-break preventing device is fixed to a tip end portion thereof. Since the drilling scratch preventive guides the chips generated by the drill blade to the rear end side of the drill blade, the generated chips are quickly separated from the workpiece. For this reason, the chips do not rotate together with the drill blade while adhering to the drill blade. Therefore, the generated chips do not come into contact with and damage the workpiece. In addition, since the hole piercing prevention tool is merely attached to the tip of the drill holder, the drill has a simple configuration, and the usability of the drill is kept good.

In the second drill holder according to the present invention, a hole-cutting / flaw-preventing device is fixed to the tip of the second holder. Since the inner peripheral surface of the hole formed in this drilling scratch prevention tool is close to the outer peripheral surface of the drill blade, the chips generated when the drill blade proceeds while rotating and processing the workpiece, With the rotation of the drill blade, it moves to the rear end side of the drill blade through the hole.
Therefore, the chips are quickly separated from the workpiece, and do not rotate together with the drill blade while the chip remains attached to the drill blade. Therefore, the generated chips do not come into contact with and damage the workpiece. In addition, since the hole piercing prevention tool is merely attached to the tip of the drill holder, the drill has a simple configuration, and the usability of the drill is kept good.

Here, the drilling and damage preventing tool is a tool that is pressed against the workpiece while the drill bit is rotating and cutting the workpiece. Is pressed against the workpiece, so that no gap is formed between the hole piercing and scratch preventing tool and the workpiece, and almost simultaneously with the generation of the chip, the chip moves to the rear end side of the drill blade ( Led). For this reason, the generated cuttings are quickly separated from the workpiece without any contact with the workpiece. Therefore,
The generated chips do not come into contact with and damage the workpiece.

Further, in the case where the drill holder has a body in which the hole preventing device is fixed at the tip and an opening is formed at the rear end side from the tip, a large amount of chips is generated. Even if they are generated, these chips are sequentially moved (guided) to the rear end side of the drill blade and fall from the opening of the fuselage, so that the chips do not stay in the vicinity of the drilling / scratch preventive device. Therefore, even if the drill holder is used in a situation where a large amount of chips is generated, the workpiece is not damaged at all.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a drill holder and a drilling / scratch preventive device.

FIG. 2 is a plan view of a drill holder having a drilling / flaw preventing device fixed to the distal end thereof, as viewed from the distal end side.

FIG. 3A is a front view showing a hole piercing / flaw preventing device, and FIG. 3B is a sectional view taken along line AA of FIG. 3A.

FIG. 4 is a partial cross-sectional view showing a drill holder immediately before cutting a workpiece;

FIG. 5 is a partial cross-sectional view showing a drill holder during cutting of a workpiece.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Drill holder 20 Body 22 Rear end 26 of body 26 Opening 30 Rotating connection shaft 32 Drill blade 32a Outer peripheral surface of drill blade 40 Workpiece 50 Drilling prevention tool 56 Bottom wall 58 Bottom wall hole 58a Inner circumference of hole surface

Claims (7)

[Claims] 1. A cutting tool, which is mounted on a tip of a drill holder rotatably mounted with a drill blade that rotates and advances to the tip side while rotating, removes chips generated by the drill blade to a rear end side of the drill blade. Guide hole drilling scratch prevention tool. 2. A hole having a diameter substantially the same as the outer diameter of the drill blade is formed on a distal end of a drill holder rotatably mounted with a drill blade that advances toward the distal end while rotating. A hole drilling / flaw prevention tool in which the inner peripheral surface of the hole is close to the outer peripheral surface of the drill bit. 3. The hole drilling prevention device according to claim 1, wherein the drill blade is pressed against the workpiece while cutting the workpiece while rotating. Utensils. 4. A drill holder rotatably mounted with a drill blade that rotates and advances to a tip end thereof, wherein a cutting chip generated by the drill blade is guided to a rear end side of the drill blade. A drill holder, comprising: a fixed hole-piercing / scratch preventive device. 5. A drill holder having a drill blade rotatably mounted on a drill blade which rotates and advances to a tip side thereof, wherein a hole having a diameter substantially equal to an outer diameter of the drill blade is formed and an inner peripheral surface of the hole is formed. Is close to the outer peripheral surface of the drill blade,
A drill holder comprising a drilling / scratch preventive device fixed to a tip portion thereof. 6. The drilling / flaw preventer is pressed against the workpiece when the drill bit is rotating and cutting the workpiece. 6. The drill holder according to 5. 7. A body having an opening formed on a rear end side of the tip with the hole-drilling / flaw-preventing and fixing device fixed thereto. A holder for a drill according to the item.