JP2003011115A - Drilling device and drilling method using the same - Google Patents

Abstract

(57) [Problem] To provide a drilling device and a drilling method capable of collecting chips while preventing the chips from leaking out during the drilling operation. SOLUTION: A tip of a cylindrical shank 11b is provided with a bit 11a for piercing an excavated object 20 and is connected to a rotary drive shaft 41 of a rotary drive device 24 so as to seal a rear end side of the core bit 11; Shank 1 of core bit 11
A communication hole 60 for communicating the inside and the outside surrounded by 1b is provided, and a dust collecting device 12 that sucks the fluid inside the core bit 11 through the communication hole 60 is attached to the opening 60a outside the communication hole 60. Was.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling device for rotating a drilling tool having a bit at the tip of a cylindrical shank around an axis and punching an object to be drilled with the tip of the rotating drilling tool. Relates to a drilling method using.

[0002]

2. Description of the Related Art When drilling an object to be excavated such as asphalt or concrete, a core bit as a drilling tool having a bit made of diamond abrasive grains fixed to the tip of an opening of a cylindrical shank, and this core bit. A perforating device having a rotary driving device such as a motor for rotating around the axis is used, and while rotating the core bit, the core bit is sent in the axial direction to press the bit at the tip against the object to be excavated. A circular groove is drilled in an object. Here, the bit used for excavation is formed by disposing diamond abrasive grains or the like in a binder phase formed by sintering a binder material such as a metal bond. During drilling, at the drilling site between the drilling object and the bit,
As a dry construction method, alumina or silicon carbide, or a dressing material for setting bits such as foundry sand or grinder powder is supplied to the perforation site together with gas such as air as a cooling fluid, or as a wet construction method, such as water. A drilling method has been adopted in which liquid is supplied as a cooling fluid to a drilling site to cool the bit and reduce wear of the bit due to drilling heat. Air and water as these cooling fluids are supplied to the inside surrounded by the shank of the core bit through a communication hole provided in the rotary drive shaft to which the rear end of the shank is connected. The cooling fluid supplied to the inside of the core bit is extruded to the tip of the bit from the gap between the inner peripheral surface of the core bit and the inner peripheral wall of the drilled groove as the pressure of the fluid inside the core bit increases.
Further, it passes through the gap between the outer peripheral surface of the core bit and the outer peripheral wall of the perforated groove and is jetted outward together with the cutting chips. A generally bowl-shaped cover, usually called a pad, is provided on the outer peripheral side of the core bit to cover the perforated groove, so that the fluid containing chips discharged from this groove is not leaked to the outside as it is. It is collected in a dust collector or the like connected to the pad while being sealed inside the pad.

[0003]

However, the pad is
Although the tip portion that comes into contact with the surface of the object to be excavated has a contact portion that is air-tight or liquid-tight so that fluid does not leak from this tip, the boring device shakes during boring work, etc. May cause a slight gap with the object to be excavated.Also, even if the insertion hole for inserting the core bit is not in close contact with the outer peripheral surface of the core bit, vibration and shake of the drilling device etc. Therefore, there is always a gap. Therefore, the fluid ejected into the pad is not completely sealed in the pad, and due to the pressure difference between the inside and the outside of the pad, between the pad and the object to be excavated,
Or, it has caused a situation in which the chips are ejected to the outside while containing the chips from the gap between the pad and the shank. Also,
When drilling a hole that penetrates an object to be excavated, at the moment when the hole exits to the opposite side, the high-pressure fluid applied to the tip of the bit spouts with the cutting chips to the opposite side. It was In most cases, such drilling work is performed while people are living in the target building, so it is natural to avoid the situation where the living environment is deteriorated due to scattering of chips and the like. Was desired.

The present invention has been made in view of the above circumstances, and provides a perforating apparatus and a perforating method capable of collecting the chips while preventing the chips from leaking out during the perforating operation. Especially.

[0005]

According to a first aspect of the present invention, there is provided a drilling tool in which a bit for drilling an object to be drilled is provided at the tip of a cylindrical shank, and the drilling tool is provided around the axis of the shank. A piercing device having a rotatively driving rotary drive, wherein a rear end side of the piercing tool is hermetically connected to a rotary drive shaft of the rotative driving device and surrounded by the shank of the piercing tool. Is provided with a communication hole that communicates the inside and the outside, and a fluid suction mechanism that sucks the fluid inside the drilling tool through the communication hole is attached to the opening outside the communication hole. It is characterized by

With this structure, the fluid containing the cutting chips passes through the space that is completely sealed from the tip of the drilling tool where chips are generated by drilling to the fluid suction mechanism. The chips contained in the fluid do not leak outside, and almost all the chips are collected, and the dust collection efficiency is improved. Moreover, since it is not necessary to increase the pressure inside the drilling tool, when drilling a through hole, the high pressure fluid applied to the tip of the bit remains on the other side together with the chips at the moment the hole comes out to the other side. The situation that it spouts out to does not occur. Rather, the fluid inside the boring tool shank is sucked and the pressure inside the boring tool is lowered, so that it should be sucked from the gap between the outer peripheral wall of the circularly drilled groove and the outer peripheral surface of the boring tool. Fluid can be supplied to cool the bit. For example, when performing perforation using only air by the dry method, air is naturally sucked from the atmosphere into the groove to be perforated, so that a conventional device such as a compressor for generating compressed air is not required. Become. Also in the case of the wet method, if a cooling liquid such as water is poured into the portion of the groove to be drilled, the cooling liquid is naturally sucked into the groove. In this way, the punching device functions like a kind of vacuum cleaner and the chips can be collected during the drilling work so as not to leak outside, and the dust collection efficiency can be improved. Then, the device for sending the cooling fluid can be simplified.

According to a second aspect of the present invention, in the punching device according to the first aspect, the punching device has a substantially bowl shape in which one side is opened, and an insertion hole is formed in the closed bottom portion of the other side. Formed, has a pad through which the drilling tool is inserted toward the side opened from the insertion hole, the tip of the opening of the pad, a contact portion capable of contacting the object to be excavated, The fluid inside the pad is provided so as not to leak from the tip, the inner surface of the pad is formed to extend from the inner surface toward the outer peripheral surface of the shank, and the pad and the shank are formed. A seal member that is formed so as to seal between the outer peripheral surface of the shank and is internally provided, and the pad is a fluid that communicates the space on the tip side inside the pad with the outside. A supply port is provided Outside the opening of the pad of the fluid supply port, wherein the fluid supply mechanism supplies fluid to the inside of said pad is attached.

With such a structure, the sealing property between the pad and the object to be excavated is secured by the abutment portion, and the sealing property between the pad and the drilling tool is secured by the seal member. It is possible to prevent the cooling fluid from leaking out from the space on the tip side inside the pad defined by the object to be excavated and the drilling tool. Since the groove to be drilled is covered with the pad, the cooling fluid can be efficiently sucked from the groove to be drilled by supplying the cooling fluid into the pad sealed as described above.

The invention according to claim 3 is characterized in that the seal member is formed in a shape having a curved surface whose outer surface is gradually reduced in diameter toward the tip side of the drilling tool.

With such a structure, the fluid supplied from the fluid supply port is smoothly sucked toward the groove to be perforated without stagnation inside the pad.

According to a fourth aspect of the present invention, in the punching device according to the second or third aspect, between the opening inside the pad of the fluid supply port and the outer peripheral surface of the shank, A fluid supply pipe is provided, the inside of which serves as a fluid flow path, and a tip of which is located in the vicinity of an intersection of a plane including the contact portion and an outer peripheral surface of the shank.

With such a structure, the opening end of the fluid supply pipe is arranged at the position of the groove to be bored, and the supply efficiency of the cooling fluid is improved. In particular, when perforating upwards by the wet method, the liquid discharged from the tip of the fluid supply pipe is supplied as it is from the groove to be perforated without filling the pad with the liquid as the cooling fluid. be able to.

According to a fifth aspect of the present invention, in the punching device according to any of the first to fourth aspects, the inner peripheral surface of the shank extends from the front end side to the rear end side of the shank. It is characterized in that a spiral spiral groove that allows the fluid to flow together with the chips from the front end to the rear end of the shank is engraved by the rotation of the shank.

In the present invention, the spiral spiral groove is formed so that the fluid flows together with the cutting chips from the front end to the rear end of the shank by the rotation of the shank. That is, when the shank rotates clockwise when viewing the tip end side from the axial rear end side, in the direction of the left screw, and when the shank rotates counterclockwise when viewing the tip end side from the axial rear end side. A spiral groove is engraved on the right screw. With this configuration, the chips generated at the tip of the drilling tool are removed from the tip of the drilling tool while being sandwiched between the spiral groove and the inner peripheral wall of the groove to be drilled together with the cooling fluid. It is conveyed toward the rear end. This causes the fluid to flow together with the cutting chips from the front end of the drilling tool to the rear end,
It is possible to suppress the clogging of chips and to promptly take out the fluid and the chips from the perforation groove to improve the recovery rate of the fluid and the chips.

According to a sixth aspect of the invention, in the punching device according to any of the first to fifth aspects, a liquid is used as the fluid, and the rear end side of the shank is closed and hermetically sealed. An opening portion of the communication hole is formed on the axis line on the rear end side, and the drilling tool is laterally provided between the inner peripheral surface of the shank and the opening portion of the communication hole. A blade portion is provided for picking up the liquid accumulated below the inside of the drilling tool from the inner peripheral surface and taking the liquid into the communication hole during drilling for sending to an object.

With such a structure, it is possible to improve the recovery rate of the liquid when laterally perforating by the wet method. That is, when drilling sideways by the wet method, a liquid containing chips is accumulated below the inside of the drilling tool, but the blades lift the liquid from the inner peripheral surface of the shank as the drilling tool rotates. , The liquid can be quickly collected because it can be taken into the communication hole and sucked. For example, the blade portion may extend between the shank and the communication hole at the rear end side portion of the closed shank, and may be provided upright along the axial direction. Thereby, at least the liquid can be scraped up. When the blade portion having such a shape is further curved and formed so as to be convex toward the rear side in the rotation direction of the drilling tool, the liquid is lifted up while collecting the liquid in the curved portion. Therefore, the liquid recovery rate can be further improved. In addition, the blade portion is curved so as to be convex toward the rear side in the rotation direction of the drilling tool, and a plate-shaped member is provided at the tip end side portion of the blade portion that is erected in the axial direction. The liquid is more likely to collect in the convexly curved portion, so that the liquid can be collected more quickly.

According to a seventh aspect of the invention, in the punching device according to any one of the first to fifth aspects, a gas is used as the fluid, and the rotary drive device is inserted with the rotary drive shaft. And a cylindrical stator provided on the outer periphery of the rotor, and the communication hole is formed so as to penetrate from the front end to the rear end of the rotary drive shaft. It is characterized by

In the present invention, since the rotary drive shaft is directly rotated by the motor composed of the rotor and the stator without a gear or the like for increasing the torque, the drilling tool can be rotated at a high speed.

According to an eighth aspect of the present invention, in the punching device according to the seventh aspect, one or both of the inside of the communication hole of the rotary drive shaft and the rear end of the inside of the shank are provided. A turbo blower unit for generating a fluid flow from the front end to the rear end by the rotation of the rotary drive shaft, the turbo blower unit being arranged in the circumferential direction around the axis and rotating with the rotation of the rotary drive shaft. It has a turbine part constituted from a plurality of moving blades.

In the present invention, the drilling tool rotates at a high speed, and the communication hole is formed so as to penetrate from the rear end of the rotary drive shaft to the inside of the shank, and the turbo blower portion near the rear end of the shank, or If it is provided on either or both of the insides of the rotary drive shaft, the turbine part that rotates at high speed together with the rotary drive shaft and the drilling tool will generate a gas flow from the front end to the rear end of the drilling tool, thereby cutting chips. The contained gas can be quickly recovered.

According to a ninth aspect of the present invention, in the drilling method, the punching device according to any one of the first to eighth aspects is used to rotate the drilling tool around the axis and rotate the drilling tool. Is sent toward the object to be excavated along the axial direction, and the bit is used to perforate the object to be excavated while sucking the fluid inside the drilling tool through the communication hole.

In the present invention, since the fluid inside the drilling tool is sucked while the drilling is performed, the entire space from the tip of the drilling tool, where chips are generated by the drilling, to the fluid suction mechanism is cut in a closed space. Since the fluid containing powder passes through, the chips contained in the fluid will not leak out,
The dust collection efficiency is improved. Moreover, since it is not necessary to increase the pressure inside the drilling tool, when drilling a through hole, the high pressure fluid applied to the tip of the bit remains on the other side together with the chips at the moment the hole comes out to the other side. The situation that it spouts out to does not occur.

According to a tenth aspect of the present invention, in the drilling method according to the ninth aspect, a dressing material for dressing the bit is supplied from the outside of the drilling tool between the bit and the object to be drilled. It is characterized by

In the present invention, the dressing material is efficiently supplied between the bit and the object to be excavated.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A perforating apparatus and a perforating method according to the present invention will be described below with reference to the drawings. 1 and 2,
1 shows a first embodiment of a punching device according to the present invention. Figure 1
FIG. 2 is a schematic configuration diagram showing a punching device, and FIG. 2 is a diagram showing a main part of the punching device partially broken away. In the figure, a punching device 10 includes a core bit 11 (drilling tool),
A device main body 10a having a rotary drive device 24 for rotationally driving the core bit 11, and a dust collector 12 for collecting chips and the like.
(Fluid suction mechanism).

The apparatus main body 10a has a core bit 11 and a rotary drive device 24 for rotationally driving the core bit 11 around the axis O. The device body 10a is further provided with an object to be excavated 2 made of concrete, asphalt, or the like.
Base 21 anchored to the surface of 0 and base 2
1 is provided with a support shaft 22 extending in the vertical direction, and a support portion 23 attached to the support shaft 22 so as to be movable back and forth by rotation of a handle 25, etc., and the rotation drive device 24 is supported by the support portion 23. Has been done.

Here, the core bit 11 is a bit 11a formed by disposing, for example, diamond abrasive grains in a binder phase formed by sintering a binder such as a metal bond.
A plurality of them are fixed at a predetermined distance in the circumferential direction by, for example, brazing so as to project from the tip of the cylindrical shank 11b. Furthermore, in the radial direction of the core bit 11, the thickness of the bit 11a is the core bit. 11, the outer peripheral surface 11A and the inner peripheral surface 1 of the core bit 11.
It is formed to be thicker than the distance from 1B.

On the outer periphery of the core bit 11, the core bit 1
An approximately bowl-shaped pad 45 having an inner diameter larger than the outer diameter of 1 is arranged.
It is configured so as to cover the annular drilling groove 20a formed in the. The pad 45 is formed into a substantially bowl shape with one side opened, and the core bit 11 is inserted into the closed bottom 45b of the other side toward the side opened from the bottom 45b. The hole 45c is formed. Then, at the opened tip of the pad 45,
The contact portion 45a capable of contacting the object 20 to be excavated is the pad 45.
The fluid inside is not leaked from this tip. Further, the pad 45 is provided with a fluid supply port 45d that connects the space inside the pad 45 and the outside. Then, the fluid supply port 45d is connected to the object 20 to be excavated.
A fluid supply mechanism 5 for supplying a cooling fluid to a space defined by the pad 45 and the shank 11b of the core bit 11.
0 is attached.

In the case of the dry method, the fluid supply mechanism 50 is, as shown in FIG. 1, a compressor 51 for generating compressed air as a cooling fluid, and alumina or silicon carbide, or molding sand or grinder powder. Etc. The inside of which the dressing material tank 52 for storing the dressing material for dressing the bits 11a, 11a, etc., and the compressed air from the compressor 51 and the dressing material from the dressing material tank 52 are mixed and sent to the pad 45. Is equipped with a hose 53 (fluid supply pipe) which is a flow path of air including a dressing material,
The tip side of this hose 53 is the fluid supply port 45 of the pad 45.
It is connected to a portion opened to the outside of d. In the case of the wet method, the fluid supply mechanism uses a pump for sending cooling water as a cooling fluid and a pad 45 for this cooling water.
The inside to be sent out to may be composed of a hose (fluid supply pipe) having a flow path of cooling water.

The rotary drive unit 24 has a rear end 11c for closing and sealing the rear end of the shank 11b of the core bit 11.
It has a rotary drive shaft 41 connected to. The axis of rotation of the rotary drive shaft 41 and the axis of the core bit 11 are aligned with each other, whereby the rotary drive shaft 41 is aligned.
The rotation of the core bit 11 causes the core bit 11 to rotate around the axis O.

A communication hole 60 is provided from the rear end portion 11c of the shank 11b to the rotary drive shaft 41 so that the inner side of the core bit 11 surrounded by the shank 11b and the outer side of the rotary drive shaft 41 communicate with each other. A dust collector that takes in the fluid inside the core bit 11 from the opening 60b on the core bit 11 side and sucks the fluid through the communication hole 60 into the opening 60a where the communication hole 60 opens toward the outside of the rotary drive shaft 41. 12 is attached.

The dust collector 12 has a rotating drive shaft 41 that rotates.
Oil seal 42 installed to prevent fluid from leaking
And a discharge pipe 43 connected to the oil seal 42 and having a fluid passage inside, and a dust collector 44 for sucking the fluid through the discharge pipe 43. This dust collector 44
In the case of the dry method, for example, a cyclone method is used as shown in FIG. In the case of the wet method, although not shown here, it is assumed that the fluid supply mechanism is provided with a mechanism for reducing the cooling liquid by providing a filter for filtering only the cooling liquid from sludge containing chips. There is.

In the piercing method for piercing by using the piercing device 10 having such a structure, the piercing work is performed as follows. First, the rotation driving device 24 rotates the core bit 11 around the axis O. In this state,
When the support portion 23 is moved forward with respect to the support shaft 22, the bit 11a fixed to the tip of the core bit 11 is pressed against the work material 20 to form a circular drill hole 20a. In the case of the dry method, the fluid supply mechanism 50 supplies the cooling gas such as air and the dressing material from the fluid supply port 45d to the pad 4a.
5 Supply to the inside. Further, in the case of the wet method, a liquid such as water as a cooling fluid is supplied into the pad 45 from the fluid supply port 45d. On the other hand, when the fluid inside the core bit 11 is sucked through the communication hole 60 by the dust collector 12 from the space inside the core bit 11 surrounded by the shank 11b and the rear end portion 11c, the pressure inside the core bit 11 is increased. A pressure drop in the pad 45 causes a difference in pressure, and a fluid flow from the pad 45 toward the inside of the core bit 11 is generated. The fluid stored in the pad 45 is sucked from the opening of the drilling groove 20a, passes through the gap between the outer peripheral wall 20B of the drilling groove 20a and the outer peripheral surface 11A of the core bit 11, and the bits 11a, 11a ... The fluid containing cutting chips supplied between the inner peripheral surface 11B of the core bit 11 and the inner peripheral wall 20A of the drilling groove 20a passes through the gap between the inner peripheral wall 20A and the inner peripheral wall 20A of the boring groove 20 to reach the rear end of the core bit 11. Sent to the side.
Thus, the fluid containing chips collected on the rear end side inside the core bit 11 passes through the communication hole 60 and the dust collecting device 12
Is sucked into.

According to the perforating apparatus 10 shown in FIG. 1, from the tip of the core bit 11 in which chips are generated by perforation to the dust collector 12, the fluid containing the chips is completely enclosed in the space. Since it passes, the chips contained in the fluid do not leak outside, and almost all the chips are recovered as they are, and the dust collection efficiency is improved. Similarly, since the recovery rate of the fluid is increased, the liquid or the like containing chips for cooling can be filtered and reused cyclically, which is simple and economical.
Moreover, since it is not necessary to increase the pressure in the core bit 11, when punching a through hole, the high-pressure fluid applied to the tip of the bit at the moment the hole exits to the opposite side remains with the cutting chips on the opposite side. The situation that it spouts out to does not occur. Rather, shank 1 of core bit 11
Core bit 11 surrounded by 1b and rear end 11c
The fluid inside the core bit 11 is sucked and the pressure inside the core bit 11 is lowered, so that the fluid for cooling the bit is supplied by being sucked through the gap between the drilling groove 20a drilled in an annular shape and the outer peripheral surface 11A of the core bit 11. be able to. Thereby, the dressing material can also be efficiently supplied. As shown in the figure, by using the pad 45, the air as a cooling gas containing a dressing material or the like is used as the perforation groove 2
It can be efficiently supplied locally to the portion 0a.
Even when a cooling liquid such as water is used, since the liquid can be supplied while being stored inside the pad 45, the liquid can be efficiently supplied without spilling to the outside. In the present embodiment, the fluid supply mechanism 50 having the compressor 51 and the like is used. However, for example, when only air is used and no dressing material is used by a dry method,
Since air is naturally sucked from the atmosphere into the perforation groove 20a to be perforated, it is not always necessary to use a device such as a compressor. Also in the case of the wet method, if a cooling liquid such as water is poured into the portion of the perforated groove 20a to be perforated, the cooling liquid is naturally sucked into the perforated groove 20a. As described above, according to the present embodiment, the punching device 10 functions like a kind of vacuum cleaner, and the chips can be collected so as not to leak outside during the punching work, and the dust collection efficiency is improved. You can Then, the device for sending the cooling fluid can be simplified.

Next, FIGS. 3 to 4 show a second embodiment of the punching device according to the present invention. FIG. 3 is an enlarged view showing a portion of the punching tool and the pad of the punching device according to the present embodiment, and is a diagram illustrating a state in which the punching is performed upward by the wet method. FIG. 4 is an exploded perspective view of the pad shown in FIG. In the figure, parts corresponding to those in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof will be omitted here.

In the present embodiment, the bottom surface 4 of the pad 45 is located on the inner surface of the pad 45 rather than the position where the fluid supply port 45d is provided.
At the position of the inner surface near 5b, from this inner surface, shank 11b
Sealing part 4 formed so as to extend toward the outer peripheral surface of the
5e (sealing member) is internally provided. This sealing part 45
As shown in FIG. 4, e has a shape obtained by cutting the tip portion of a cone, and has a curved surface whose outer surface gradually reduces in diameter toward the tip side. The tip portion 45f of the sealing portion 45e is opened so that the core bit 11 can be inserted therethrough, which enables the rotation of the core bit 11 while preventing the fluid from leaking, and the outer peripheral surface 1 of the shank 11b.
It is a portion that is in sliding contact with 1A. Also, this tip 4
5f is dragged by the shank 11b due to friction with the outer peripheral surface 11A as the core bit 11 is inserted on the tip side in the direction of the axis O, further projects toward the tip side, and the outer surface gradually shrinks toward the tip side. The diameter curved surface is an elastic body such as rubber that can be deformed so as to be slightly stretched in the direction of the axis O. The space H inside the pad 45, which is defined by the pad 45 and the shank 11b, is partitioned into a space H1 on the front end side and a space H2 on the rear end side by the sealing portion 45e, and the space H2 on the rear end side is separated from the front end. The flow of the fluid toward the side space H1 is blocked.

In the punching device of this embodiment,
Between the portion where the fluid supply port 45d opens toward the inside of the pad 45 and the outer peripheral surface 11A of the shank 11b, the inside is a fluid flow path and the tip includes the contact portion 45a of the pad 45. Flat surface and outer peripheral surface 11 of shank 11b
A fluid supply pipe 45g formed so as to be located in the vicinity of the intersection with A is provided, and at the time of drilling, the tip thereof is configured to be adjacent to the outer opening of the drilling groove 20a. Here, the fluid supply pipe 45g may be composed of a tip end side portion of the hose 53 with the hose 53 connected to the fluid supply port 45d being drawn to the inside of the pad 45.

According to the punching device of this embodiment, the pad 4
5 and the excavation object 20 are secured by the contact portion 45a and the pad 45 and the core bit 11 are secured by the sealing portion 45e. Thus, the pad 45, the excavation object 20 and the core bit 11 are secured. The cooling fluid is prevented from leaking out from the space H1 on the tip side inside the pad 45 defined by and. Since the perforation groove 20a is covered with the pad 45, the cooling fluid can be efficiently sucked from the perforation groove 20a by supplying the cooling fluid into the pad 45 sealed as described above.
In particular, the shape of the sealing portion 45e has a curved surface whose outer surface gradually reduces in diameter toward the tip end side, and the flow of fluid from the space H2 on the rear end side to the space H1 on the tip end side is blocked. Therefore, the fluid supplied from the fluid supply port 45d is smoothly sucked toward the perforation groove 20a without stagnating inside the pad 45. Further, since the opening tip of the fluid supply pipe 45g is arranged at the position of the perforation groove 20a, the efficiency of supplying the cooling fluid is improved. In particular, as shown in FIG. 3, when drilling upward by the wet method,
It is possible to supply the liquid discharged from the tip of the fluid supply pipe 45g as it is by sucking it from the perforation groove 20a without filling the pad 45 with the liquid as the cooling fluid. At this time, even if the liquid is not sucked and drops downward while traveling along the outer peripheral surface 11A of the shank 11b, the liquid is drained outward from the outer peripheral surface 11A of the shank 11b due to the umbrella-like shape of the sealing portion 45e. , Liquid is stored in the recessed portion P between the pad 45 and the sealing portion 45e and does not leak to the lower side of the pad 45. As a result, it is possible to prevent the liquid from entering the rotary drive device during the boring operation.

In this embodiment, the sealing portion 45
Although e is made of an elastic material, it may be a brush-like material densely planted on the inner surface of the pad 45.

Next, FIG. 5 shows a third embodiment of the punching device according to the present invention. FIG. 5 is an enlarged view of a portion of the punching tool and the pad of the punching device according to the present embodiment, and is a diagram illustrating a state in which the punching is performed downward. In the figure, parts corresponding to those in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof will be omitted here.

In the punching device of this embodiment, the spiral spiral groove 11d is engraved so that the fluid flows together with the cutting chips from the front end to the rear end of the shank 11b by the rotation of the shank 11b.

According to the punching device of this embodiment, the chips generated at the tip of the core bit 11 are sandwiched between the spiral groove 11d and the inner peripheral wall 20A of the drilling groove 20a together with the cooling fluid. The core bit 11 is conveyed from the front end to the rear end. As a result, the fluid is made to flow together with the cutting chips from the front end to the rear end of the core bit 11 to suppress chip clogging, and the fluid and the cutting chips are quickly taken out from the perforation groove to improve the collection speed of the fluid and the cutting chips. You can In particular, it can be effectively used for taking out the chips that are likely to accumulate downward when taking out the core bit 11 with the core bit facing downward.

Next, FIGS. 6 to 7 show a fourth embodiment of the punching device according to the present invention. FIG. 6 is an enlarged view showing a portion of the punching tool and the pad of the punching device according to the present embodiment, and is for explaining a state in which the punching is performed laterally by the wet method. FIG. 7 is a view of the drilling tool according to the present embodiment as viewed from the tip side. In the figure, parts corresponding to those in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof will be omitted here.

In the punching apparatus of this embodiment, a liquid such as water is used as a cooling fluid, and the rear end portion 11c that closes the rear end side has an inner circumference of the liquid that accumulates below the inside of the core bit 11. A plurality of blade portions 11e, 11e, ... Which are picked up from the surface 11B and are taken into the communication hole 60 are arranged in the circumferential direction. Here, as shown in FIG. 7, each of the blade portions 11 e has a shank 11 b and an opening portion 60 of the communication hole 60.
It is formed so as to extend between the core bit 11 and b and to stand upright along the axis O direction, and to be curved so as to be convex toward the rear side in the rotation direction of the core bit 11.

According to the perforation apparatus of this embodiment, the liquid recovery rate can be improved when the perforation is performed laterally by the wet method. That is, when the horizontal drilling is performed by the wet method, the liquid containing the cutting chips is accumulated below the inside of the core bit 11, but the blade 11e rotates the core bit 11 and shanks the liquid.
Since the liquid can be picked up from the inner peripheral surface 11B side and taken into the communication hole 60 and sucked, the liquid can be quickly recovered.

A structure in which a plate-like member is provided on the tip side of the blade portion may be used. With such a configuration, the liquid is more likely to be accumulated in the convexly curved portion of the blade portion, and the liquid can be collected more quickly.

Next, FIG. 8 shows a fifth embodiment of the punching device according to the present invention. 8, parts corresponding to those in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof will be omitted here.

In the punching device of this embodiment, a gas such as air is used as a cooling fluid, and the rotary drive device 7 is used.
0 is the rotor 7 to which the rotary drive shaft 71 is inserted and fixed.
2 and a cylindrical stator 73 provided on the outer circumference of the rotor 72. The communication hole 60 is formed so as to penetrate from the front end to the rear end of the rotary drive shaft 71. A turbo blower portion 81 is provided at a rear end side portion inside the communication hole 60. As shown in the drawing, the turbo blower portion 81 includes an outer cylinder 82 fitted in the communication hole 60 and an outer cylinder 8
The inside of 2 has a plurality of turbine parts 83 provided at intervals in the longitudinal direction. Here, the turbine portion 83 has a plurality of moving blades 84 arranged in the circumferential direction, and the turbine portion 83 has a plurality of moving blades 84 arranged in the same direction so as to generate a fluid flow from the front end to the rear end by rotation of the rotary drive shaft 71. Being tilted down.

According to the punching device of this embodiment, the rotary drive shaft 71 is directly attached to the rotor 72 of the motor 70a and rotated without using a gear or the like for increasing the torque, so that the core bit 11 rotates at high speed. To do. Communication hole 6
No. 0 is formed so as to penetrate from the rear end of the rotary drive shaft 71 to the inside of the shank 11b.
When 1 is provided inside the communication hole 60, the rotation drive shaft 71
At the same time, the turbine section 83 rotating at high speed generates a gas flow from the front end to the rear end of the core bit 11,
A gas containing chips can be quickly recovered.

In the present embodiment, the turbo blower portion is provided inside the communication hole, but it may be provided near the rear end of the shank 11b of the core bit 11. In addition, as shown in FIG.
Instead of providing the turbo blower portion inside the, a dust collecting device (not shown) as a fluid suction mechanism is attached to the opening 60a, and chips are collected through the oil seal 85 and the discharge pipe 86. May be done. According to such a configuration, since a straight flow path is formed from the inside of the core bit 11, the flow of the fluid is improved and the dust collection efficiency is improved.

[0051]

The present invention has the following effects. According to the invention of claim 1, the rear end side of the drilling tool in which the bit for drilling the object to be drilled is provided at the tip of the cylindrical shank is connected to the rotary drive shaft of the rotary drive device so as to be sealed. Since it is equipped with a fluid suction mechanism that sucks the fluid inside the drilling tool through a communication hole that connects the inside and outside of the drilling tool, it prevents cutting chips from leaking outside during drilling work. The powder can be collected and the dust collection efficiency can be improved.

According to the second aspect of the invention, the tip of the pad is provided with an abutting portion capable of abutting against the object to be excavated so that the fluid inside the pad does not leak from the tip.
The inner surface of the pad is internally provided with a seal member formed to seal between the pad and the shank.
Since the fluid supply port that connects the inside and the outside of the pad is provided and the fluid is supplied from the fluid supply port to the inside of the pad, it is possible to efficiently suck the cooling fluid from the groove that is drilled. You can

According to the third aspect of the present invention, the seal member is formed in a shape having a curved surface whose outer surface gradually reduces in diameter toward the tip side of the drilling tool. It is possible to smoothly suck the fluid supplied from the inside of the pad toward the groove to be drilled without stagnation.

Further, according to the invention described in claim 4, between the fluid supply port and the outer peripheral surface of the shank, a tip is provided in the vicinity of an intersection of the flat surface including the contact portion and the outer peripheral surface of the shank. Since the fluid supply pipe located is provided, the liquid discharged from the tip of the fluid supply pipe can be sucked and supplied as it is from the groove to be drilled, and the supply efficiency of the cooling fluid is improved.

Further, according to the invention of claim 5, since the spiral spiral groove is engraved on the inner peripheral surface of the shank, the fluid and the chips are swiftly taken out from the perforation groove to form the fluid. It is possible to improve the speed of collecting chips.

According to the sixth aspect of the present invention, a liquid is used as the fluid, and a drilling tool is placed sideways between the inner peripheral surface of the shank and the opening of the communication hole to the object to be excavated. At the time of perforation to be sent to the direction, a blade part that scrapes up the liquid accumulated inside the drilling tool from the inner peripheral surface and takes it into the communication hole is provided. The speed can be improved.

According to the seventh aspect of the present invention, gas is used as the fluid, and the rotary drive device includes a rotor having a rotary drive shaft inserted and fixed, and a cylinder provided on the outer periphery of the rotor. Since the through hole is formed so as to penetrate from the front end to the rear end of the rotary drive shaft, the drilling tool can be rotated at high speed.

According to the invention described in claim 8, either or both of the inner side of the communication hole of the rotary drive shaft and the rear end of the inner side of the shank are rotated from the front end by the rotation of the rotary drive shaft. A turbo blower unit for generating a fluid flow toward the rear end is provided, and the turbo blower unit is provided with a plurality of rotor blades arranged in the circumferential direction around the axis and rotated with the rotation of the rotary drive shaft. Since it has, it is possible to quickly collect the gas containing the chips.

According to the invention described in claim 9, in the drilling method, the drilling device according to any one of claims 1 to 8 is used, and the fluid inside the drilling tool is passed through the communicating hole. Since the object to be excavated is perforated while sucking, it is possible to prevent chips from leaking outside during the perforation work, and it is possible to improve the dust collection efficiency.

According to the invention described in claim 10,
In the drilling method according to the ninth aspect, since the dressing material for dressing the bit is supplied from the outside of the drilling tool, the dressing material can be efficiently supplied between the bit and the object to be excavated.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment according to the present invention,
It is a schematic structure figure showing an example of a punching device.

FIG. 2 is a diagram showing an embodiment according to the present invention,
It is a figure which partially cuts and shows the principal part of a punching device.

FIG. 3 is a view showing another embodiment according to the present invention, which is an enlarged sectional view showing a punching tool and a pad of the punching device.

FIG. 4 is an exploded perspective view of the pad shown in FIG.

FIG. 5 is a view showing still another embodiment according to the present invention, which is an enlarged sectional view showing a punching tool and a pad of the punching device.

FIG. 6 is a view showing still another embodiment according to the present invention, which is an enlarged sectional view showing a punching tool and a pad of the punching device.

7 is a view of the drilling tool of FIG. 6 viewed from the tip side.

FIG. 8 is a view showing still another embodiment according to the present invention, and is a schematic configuration diagram showing in section a part of a drilling tool and a rotation driving device of the drilling device.

FIG. 9 is a view showing still another embodiment according to the present invention, and is a schematic configuration diagram showing in section a part of a drilling tool and a rotation driving device of the drilling device.

[Explanation of symbols]

10 ... Punching device 10a: device body 11: Core bit (drilling tool) 11a ... bit 11b ... Shank 11c ... rear end 11d ... spiral groove 11e ... feather part 12 ... Dust collector (fluid suction mechanism) 20 ... Excavation object 20a ... Drilling groove 24, 70 ... Rotation drive device 41, 71 ... Rotation drive shaft 45 ... Pad 45a ... Abutting part 45b ... bottom 45c ... Insertion hole 45d ... Fluid supply port 45e ... hermetically sealed part (seal member) 45f ... Tip 45g: Fluid supply pipe 50 ... Fluid supply mechanism 60 ... Communication hole 60a ... Opening (outer opening) 72 ... Rotor 73 ... Stator 81 ... Turbo blower part 83 ... Turbine section 84 ... Moving blade O ... axis H1 ... Space (space on the tip side inside the pad)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tsuyoshi Kawahara             681 Saedo-cho, Tsuzuki-ku, Yokohama-shi, Kanagawa Japan             Inside Diamond Co., Ltd. F-term (reference) 3C037 AA05 DD07                 3C069 AA04 BA09 CA09 DA06 DA07                       EA01

Claims (10)

[Claims] 1. A drilling device comprising: a drilling tool having a bit for drilling an object to be drilled provided at the tip of a cylindrical shank; and a rotary drive device for rotationally driving the drilling tool around the axis of the shank. The rear end side of the drilling tool is connected to the rotary drive shaft of the rotary drive device so as to be hermetically sealed, and a communication hole that connects the inside and the outside of the drilling tool surrounded by the shank is provided. A drilling device is attached to an opening outside the communication hole, and a fluid suction mechanism for sucking a fluid inside the drilling tool through the communication hole is attached. 2. The punching device according to claim 1, wherein one side is formed into a substantially bowl shape, and an insertion hole is formed in the closed bottom portion of the other side from the insertion hole. There is a pad through which the drilling tool is inserted toward the opened side, the abutting portion capable of abutting the excavation object at the open tip of the pad, the fluid inside the pad is The pad is provided so as not to leak from the tip, the inner surface of the pad is formed so as to extend from the inner surface toward the outer peripheral surface of the shank, and seals between the pad and the shank. A seal member that is slidably in contact with the outer peripheral surface of the formed shank is provided inside, and the pad is provided with a fluid supply port that communicates a space on the tip side inside the pad with the outside. Fluid supply port Outside the opening of the head, piercing apparatus characterized by fluid supply mechanism for supplying the fluid is attached to the inside of the pad. 3. The punching device according to claim 2, wherein the sealing member is formed in a shape having a curved surface whose outer surface is gradually reduced in diameter toward the tip side of the drilling tool. Punching device. 4. The punching device according to claim 2 or 3, wherein a fluid passage is provided inside between an opening inside the pad of the fluid supply port and an outer peripheral surface of the shank. The drilling device is provided with a fluid supply pipe whose tip is located in the vicinity of an intersection of a plane including the contact portion and the outer peripheral surface of the shank. 5. The punching device according to claim 1, wherein an inner peripheral surface of the shank extends from the front end side to the rear end side of the shank, and the shank is rotated to rotate the shank. A perforating device, characterized in that a spiral spiral groove that allows a fluid to flow together with chips from the front end to the rear end is engraved. 6. The punching device according to claim 1, wherein a liquid is used as the fluid, the rear end side of the shank is closed and sealed, and the rear end side of the shank is closed. An opening portion of the communication hole is formed on the axis, and between the inner peripheral surface of the shank and the opening portion of the communication hole, when the boring tool is laterally directed toward the object to be excavated, A piercing device, comprising: a blade portion that scrapes the liquid accumulated below the inside of the piercing tool from the inner peripheral surface and takes the liquid into the communication hole. 7. The punching device according to claim 1, wherein a gas is used as the fluid, and the rotary drive device includes a rotor to which the rotary drive shaft is inserted and fixed. And a cylindrical stator provided on the outer periphery of the rotor, wherein the communication hole is formed so as to penetrate from the front end to the rear end of the rotary drive shaft. . 8. The punching device according to claim 7, wherein either or both of the inner side of the communication hole of the rotary drive shaft and the rear end of the inner side of the shank rotate the rotary drive shaft. Is provided with a turbo blower section for generating a fluid flow from the front end to the rear end, and the turbo blower section is provided around a plurality of rotor blades arranged circumferentially around the axis and rotated with the rotation of the rotary drive shaft. A perforating apparatus having a configured turbine portion. 9. The drilling device according to claim 1, wherein the drilling tool is rotated around the axis, and the rotating drilling tool is used to rotate the drilling tool along the axis. And a fluid inside the drilling tool is sucked through the communication hole to drill the drilling object by the bit. 10. The drilling method according to claim 9, wherein a dressing material for dressing the bit is supplied from the outside of the drilling tool between the bit and the object to be drilled. .