JPH07237193A - Punching device - Google Patents

Abstract

PURPOSE:To extremely easily remove a circular cut piece cut off by an outer peripheral cutting edge. CONSTITUTION:A central drill and an annular outer peripheral cutting edge 2 having a cutting edge on the outer periphery are installed on a portable tool body 1, and in the central drill 4, a tapering part 42 is formed in the tip part, and at least a part of an inner wall of a work hole of a worked material 9 is set in a position where the outer peripheral cutting edge 2 completes cutting of the worked material 9 so as to be opposed to the tapering part 42 of the central drill 4. A hood 5 is formed to cover an outer peripheral part of the outer peripheral cutting edge 2, and an air duct 6 is installed so as to communicate with the inside space 10, and an air discharge means 7 is arranged, and a dustcollecting means 8 is connected to an end part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punching device for punching a plastic plate or the like.

[0002]

2. Description of the Related Art Conventionally, for example, as shown in FIG.
Further, there is known an apparatus for simultaneously processing a central hole and an outer peripheral hole as shown in FIG. This is provided with a center drill 49 and a peripheral cutting edge body 28 which is arranged concentrically with the center drill 49 and is formed in a cylindrical shape on the outer periphery of the center drill 49. 29 is attached at two places in the circumferential direction. There are four cutting blades 29 installed. The tip portion of the center drill 49 is arranged so as to project forward from the tip portion of the outer peripheral cutting edge 29. The center drill 49 forms a center hole in the workpiece, and the outer peripheral cutting edge 29 forms the outer peripheral portion of the center hole. A hole of a predetermined size is formed in the. The center drill 49 is formed to have a uniform thickness from the base end portion to the tip end portion, but only the tip end portion of a small size is sharpened to bite the work material.

[0003]

In the above structure, the outer peripheral cutting edge 29 forms a hole of a predetermined size in the workpiece, but the circular cut piece of the hole portion cut by the outer peripheral cutting edge 29 is Since it was pushed inside the outer peripheral cutting blade body 28, it took a great deal of time to remove the pushed cutting pieces. There is also a problem that powdery chips generated by cutting the work piece with the central drill 49 and the outer peripheral cutting edge 29 are scattered around to deteriorate the working environment.

The present invention has been made in order to solve the above-mentioned conventional drawbacks, and it is extremely easy to form a circular cut piece of a hole portion cut out by the outer peripheral cutting blade and pushed into the outer peripheral cutting blade. An object of the present invention is to provide a drilling device that can be removed.

Another object of the present invention is to provide a drilling device in which the working environment is not deteriorated by the powdery chips produced by the cutting of the work piece by the central drill or the peripheral cutting edge. It is a thing.

[0006]

The present invention has a center drill and an annular outer peripheral cutting edge which is arranged concentrically with the central drill and has a cutting edge on the outer periphery of the central drill. In a hole punching device in which the tip portion is arranged so as to project forward from the tip portion of the outer peripheral cutting blade, the central drill has a tapered portion formed at the tip portion thereof, and the outer peripheral cutting blade completes cutting of the workpiece. Then, at least a part of the inner wall of the processed hole of the workpiece is set so as to face the tapered portion of the central drill.

Instead of tapering the central drill, the inner diameter of the outer peripheral cutting edge may be gradually increased toward the tip side, and both the central drill and the outer peripheral cutting edge are tapered. May be.

The base end of the center drill may be detachably attached to the base end of the outer peripheral cutting edge.

Further, the center drill and the outer peripheral cutting edge may be attached to a portable tool main body equipped with a drive motor so as to rotate integrally, and the tool main body further includes a hood and air in the hood. This hood covers the outer peripheral portion of the outer peripheral cutting edge, and the tip of the hood abuts the surface of the work piece to form a closed space inside and the outer peripheral cutting edge It may be configured so as to be contracted by being pushed according to a cut in the material, an air duct being connected to this closed space, and an air discharging means being provided in this air duct. It is preferable to attach dust collecting means to the air duct, and the hood may be formed by a cylindrical body formed of a flexible sheet and a coil spring having a shape along the cylindrical body.

[0010]

In the above structure, the central drill has the tapered portion at the tip thereof, and at the position where the outer peripheral cutting edge completes the cutting of the workpiece, at least a part of the inner wall of the drilled hole of the workpiece is the central drill. It is set so as to face the tapered part of the blade, or the inner diameter of the outer peripheral cutting edge is gradually increased toward the tip side, so cutting by rotation of the center drill and outer peripheral cutting edge after completion of drilling Axial force acts on the piece to automatically extrude the cutting piece from the outer peripheral cutting edge,
The cut pieces can be discharged very easily.

When a hood is provided on the outer peripheral portion of the outer peripheral cutting blade so that the air in the inner space is exhausted by the air duct, the chips generated by the machining are not scattered around and the working environment is cleaned. Can be kept at

[0012]

1 and 2, a hand-held tool main body 1 has a grip portion formed at an upper end thereof and a hose for supplying compressed air (not shown) is connected thereto, and the main body 1 is driven by compressed air. A motor 11 and a chuck 12 for mounting a tool are provided. A base end portion 20 of the outer peripheral cutting edge 2 is attached to the chuck 12 at the tip of the main body 1, and a central drill 4 is arranged concentrically with the outer peripheral cutting edge 2 at the center of the outer peripheral cutting edge 2. Further, a cylindrical mounting member 50 is mounted on the tool body 1 by a hose band 53, and an upper end portion of a cylindrical body 51 made of a flexible sheet is mounted on the mounting member 50 by a hose band 53. A coil spring 52 having a shape conforming to the inner surface of the body 51 is attached to the inner surface of the body 51, and the hood 5 that covers the outer peripheral portion of the outer peripheral cutting edge 2 is formed by these. An air duct 6 is attached so as to communicate with the internal space (closed space) 10 of the hood 5, and an air discharge means 7 is provided at the tip of the air duct 6 and an air hose 71 for supplying compressed air is connected. Further, dust collecting means 8 is connected to the tip of the air discharging means 7.

The air discharging means 7 may be a fan which is rotated by compressed air supplied from the air hose 71 and sucks air from the air duct 6, and the compressed air is blown out from the air hose 71 to reduce the pressure. It may be generated so that the air from the air duct 6 is sucked. The dust collecting means 8 may be a dust collecting bag in which the air from the air discharging means 7 is passed to collect dust with an appropriate filter, or a conventionally known dust collector.

The outer peripheral cutting edge 2 is formed in a tubular shape with its tip (lower end) being open, and the base end portion 20 connected to the tool body 1 is formed in a small diameter, and the tip end portion of the tubular portion 21 is formed. The concave portions 23 are formed in a saw-like shape at regular intervals, and granular diamond is attached (electrodeposited) to the surface by a known means to form an annular cutting edge 22 at the tip. The tip of the center drill 4 is arranged so as to project forward (downward) from the tip of the outer peripheral cutting edge 2. As shown in FIGS. 3 and 4, the center drill 4 has a base end portion 2 of an outer peripheral cutting edge.
A base end portion 40 connected to 0 and an intermediate portion 41 having a uniform thickness.
And a tapered portion 42 formed at the tip of the tapered portion,
It is composed of a tip portion 43 which is sharpened to bite the work material. The length L of the tapered portion 42 is
It is determined according to the thickness of the workpiece 9 to be applied, and the inclination angle θ is about 7 ° in the case of the example, but it is 3 to 20 ° depending on the material of the workpiece. It may be determined within the range, and the range of 5 to 10 ° is particularly preferable. Further, the length h of the most distal end portion 43 may be set to the same extent as the radius of the tip end portion of the tapered portion 42.

As shown in FIG. 2, the center drill 4 is detachably attached by inserting the base end portion 40 into the base end portion 20 from the lower side of the outer peripheral cutting edge 2 and fixing it with the set screw 27. I am trying. Therefore, only the center drill 4 can be replaced according to the plate thickness of the work material.

FIG. 5 shows another embodiment of the outer peripheral cutting edge 2. The cylindrical portion 24 is formed so that the inner peripheral surface 25 is inclined so that the outer diameter is constant and the inner diameter gradually increases toward the tip end side. ing.
Other configurations are similar to those of the above-mentioned embodiment. In this configuration, the center drill may have a uniform thickness as in the conventional example. As described above, not only the center drill 4 but also the outer peripheral cutting edge may be tapered.

FIG. 6 shows still another embodiment of the outer peripheral cutting edge, in which the cylindrical portion 26 is formed so that the outer peripheral surface 27 is inclined so that the inner diameter is constant and the outer diameter becomes gradually smaller toward the tip side. There is. With this configuration, the inner wall of the hole formed in the workpiece can be a tapered surface. Other configurations are similar to those of the above-mentioned embodiment.

An air passage is formed at the axial center of the central drill 4, the tip of the passage is opened inside the outer peripheral cutting edge 2 (internal space 200), and the inside of the outer peripheral cutting edge 2 is passed through this passage. You may comprise so that compressed air may be supplied to the space 200, and if it does in this way, the pressure by this air,
A cutting piece described below can be pressed from the inside to facilitate extraction.

Next, the operation of this device will be described. As shown in FIGS. 1 and 2, the operator holds the portable tool body 1 by hand and presses the center drill 4 at the tip end against the work material 9 made of the FRP plate material. As a result, the tip of the hood 5 is also pressure-bonded to the surface of the work material 9, and the outer peripheral cutting edge 2
An internal space 10 is formed that is substantially dense around the periphery of the.
When the lever 13 is operated to drive the device in this state,
The central drill 4 and the outer peripheral cutting edge 2 rotate simultaneously, and the central hole 4 is first processed to form the central hole 92 so that the central position is fixed. Is brought into contact with the workpiece 9, and the cutting edge 22 processes the outer peripheral groove 91.

As shown in phantom lines in FIGS. 1 and 2, the circular portion (cutting piece) 90 separated by the outer peripheral cutting edge 2 is a cylinder in a state where the outer peripheral cutting edge 2 has completed cutting of the workpiece 9. It is in a state of being fitted inside the portion 21. Further, in this state (position), the tapered portion 42 is dimensioned so that at least a part of the inner wall of the central hole 92 of the workpiece 9 faces the tapered portion 42 of the central drill 4 as shown in FIG. 4, for example. ing. Therefore, if the outer peripheral cutting edge 2 and the central drill 4 are continuously rotated in this state, the tapered portion 42 and the central hole 92 are formed.
The axial force acts on the inner wall of the cutting piece 90 to push the cutting piece 90 toward the tip of the center drill 4 and automatically push the cutting piece 90 to the outside of the cylindrical portion 21. The entire inner wall of the processed hole 92 of the workpiece 9 may be set to face the tapered portion 42 of the central drill 4.

When the inner peripheral surface 25 of the outer peripheral cutting edge 2 is inclined as shown in FIG. 5, the inner peripheral surface 25 of the outer peripheral cutting edge also has the function of extruding the cutting piece 90. Therefore, it is possible to use a center drill having a uniform thickness. Further, as described above, when the compressed air is supplied into the internal space 200 of the outer peripheral cutting edge 2, the cutting piece 90 is pushed out by the pressure of the air, and the cutting piece 90 is more effectively discharged. Can be easy.

When the work material 9 is processed as described above, the hood 5 receives a pressing force from the surface of the work material 9 in accordance with the processing, and the coil spring 52 is compressed, so that the hood 5 is always processed. The tip of the abutment abuts on the surface of the material to be processed 9 and the internal space 10 is kept substantially sealed. Further, by supplying air from the air hose 71 to the fan 7, the fan 7 is rotated to suck the air in the internal space 10 through the air duct 6 and send it to the dust collecting means 8. As a result, air containing chips (dust) generated by the center drill 4 and the outer peripheral cutting edge 2 is discharged through the air duct 6, and thus dust is prevented from scattering around. The suction of the air reduces the pressure in the internal space 10, so that the air is supplied to the internal space 10 through a slight gap between the hood 5 and the workpiece 9. Alternatively, the air duct 6 may not be provided and only the hood 5 may prevent the dust from scattering.

As the outer peripheral cutting edge, high-speed cutting is performed when granular diamond is attached (electrodeposited) to the surface of the tip of the above-mentioned cylindrical body to form an annular cutting edge at the tip. However, the present invention is not limited to this, and a conventional peripheral cutting edge as shown in FIGS. 7 and 8 may be used.

[0024]

As described above, according to the present invention, the central drill has the tapered portion formed at the tip thereof, and the outer peripheral cutting edge completes the cutting of the workpiece, and the drilled hole of the workpiece is drilled. At least a part of the inner wall of the is set so as to face the tapered portion of the central drill, or because the inner diameter of the outer peripheral cutting edge is formed to gradually increase toward the tip side,
The rotation of the center drill and the outer cutting edge after the hole has been processed causes an axial force to act on the cutting piece, and the cutting piece can be automatically extruded from within the outer cutting edge. Can be done

When a hood is provided on the outer peripheral portion of the outer peripheral cutting blade to prevent dust from scattering and air in the inner space of the hood is exhausted by an air duct, chips generated by machining are scattered to the surroundings. It is possible to keep the working environment clean without causing it.

[Brief description of drawings]

FIG. 1 is a schematic front view of the entire apparatus showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the outer peripheral cutting edge of FIG.

3 is a side view of the center drill of FIG. 1. FIG.

FIG. 4 is a cross-sectional view of a state of being processed by a center drill.

FIG. 5 is a cross-sectional view showing another embodiment of the outer peripheral cutting edge.

FIG. 6 is a cross-sectional view showing still another embodiment of the outer peripheral cutting edge.

FIG. 7 is a sectional view showing an example of a conventional punching device.

FIG. 8 is a bottom view of FIG. 7.

[Explanation of symbols]

 1 Tool Main Body 2 Peripheral Cutting Edge 4 Center Drill 5 Hood 6 Air Duct 7 Air Discharge Means 8 Dust Collection Means 21 Cylindrical Part 22 Cutting Edge 42 Center Taper Tapered Part

Claims (9)

[Claims] 1. A center drill, and an annular outer peripheral cutting edge arranged concentrically with the central drill and having a cutting edge on the outer periphery of the central drill, wherein the tip of the central drill has a tip of the outer peripheral cutting edge. In the drilling device arranged to project forward from the portion, the central drill is formed with a tapered portion at its tip, the outer peripheral cutting edge at a position where the cutting of the workpiece is completed,
A drilling device, wherein at least a part of an inner wall of a processed hole of a workpiece is set to face a tapered portion of a center drill. 2. A center drill, and an annular outer peripheral cutting edge arranged concentrically with the central drill and having a cutting edge on the outer periphery of the central drill, and the tip of the center drill has a tip of the outer peripheral cutting edge. A hole punching device that is disposed so as to project forward from the portion, wherein the inner diameter of the outer peripheral cutting edge is formed so as to gradually increase toward the tip end side. 3. A center drill, and an annular outer peripheral cutting edge arranged concentrically with the central drill and having a cutting edge on the outer periphery of the central drill, and the tip of the central drill has a tip of the outer peripheral cutting edge. In the drilling device arranged to project forward from the portion, the central drill is formed with a tapered portion at its tip, the outer peripheral cutting edge at a position where the cutting of the workpiece is completed,
At least a part of the inner wall of the processing hole of the workpiece is set to face the tapered portion of the central drill, and the inner diameter of the outer peripheral cutting edge is formed so as to gradually increase toward the tip side. Drilling device. 4. The drilling device according to claim 1, wherein the center drill has a base end portion removably attached to a base end portion of the outer peripheral cutting edge. 5. A center drill, and an annular outer peripheral cutting edge which is arranged concentrically with the central drill and has a cutting edge on the outer periphery of the central drill, and the tip of the center drill has a tip of the outer edge cutting edge. In the drilling device arranged to project forward from the portion, the central drill is formed with a tapered portion at its tip, the outer peripheral cutting edge at a position where the cutting of the workpiece is completed,
A drilling device, characterized in that all of the inner walls of the drilled holes in the workpiece are set so as to face the tapered portion of the central drill. 6. The drilling hole according to claim 1, wherein the center drill and the outer peripheral cutting edge are attached to a portable tool body having a drive motor so as to rotate integrally. apparatus. 7. A hood and an air duct for exhausting air in the hood are attached to the tool body, the hood covers the outer peripheral portion of the outer peripheral cutting edge, and the tip portion thereof is the surface of the workpiece. A closed space is formed by abutting against the inner peripheral surface of the work piece and is compressed by being pressed according to the cutting of the outer peripheral cutting edge into the workpiece, and an air duct is connected to the closed space. 7. The punching device according to claim 6, further comprising discharging means. 8. The punching device according to claim 7, wherein dust collecting means is attached to the air duct. 9. The punching device according to claim 7, wherein the hood is formed of a cylindrical body formed of a flexible sheet and a coil spring having a shape along the cylindrical body.