JPH09291509A - Drilling end mill and drilling equipment - Google Patents

Abstract

(57) Abstract: [PROBLEMS] To provide an end mill for excavation and an excavation device that have low noise and low vibration and can significantly improve the efficiency and the degree of freedom of excavation and cutting work on a pavement surface. SOLUTION: A hydraulic motor 3 and an end mill 4 driven by the hydraulic motor 3 are removably mounted on an arm 2 connected to a hydraulic working machine main body 1 via an anti-vibration rubber 5A. To supply hydraulic pressure to the hydraulic motor 3 to excavate and cut the pavement surface. Further, the end mill 4 is provided with the excavating bits 21A and 21B and the positioning bit 31 on the excavating surface 11, and the cutting surface 12 is provided with a plurality of bit rows in which the cutting bits 22 are arranged at a predetermined interval, and each cutting bit is provided. 22 was attached for each bit string with the phase shifted in the direction of the rotation axis. Further, the end mill 4 has a passage 15 for introducing pressurized water or pressurized air.
And an outlet 16 communicating with the passage 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an excavating device for excavating and cutting roads and other pavement surfaces.

[0002]

2. Description of the Related Art Road works and burial works for water and sewer pipes, electric power pipes, communication pipes, gas pipes, etc. sometimes require work to dig up already paved ground. In this case, after cutting the pavement surface in a specified range with a concrete cutter, etc., crush this pavement surface with a crusher such as a hydraulic breaker, dig up these crushed lumps with a power shovel, etc. Although the ground will be excavated, examples of devices used for this type of construction include Japanese Patent Laid-Open No. 7-54309 and Japanese Patent Publication No. 7-9180.
A proposal is made in Japanese Patent Publication No. 7.

Of these, the former is a hydraulic excavator as shown in FIG. 20, which allows the above-mentioned cutting, crushing and excavation work of the pavement surface to be carried out continuously by a single device. That is, in this hydraulic excavator, a work machine coupler 106 that is rotatable by a bucket cylinder 104 via a link 105 is pivotally attached to the tip of an arm 103 attached to a hydraulic work machine main body 101 via a boom 102. A bucket or asphalt cutter device 107 (not shown) can be selectively attached to the working machine coupler 106.

As a result, the asphalt cutter device 107 is first attached to the working machine coupler 106 of the working machine 101, and the asphalt road surface is cut by the cutter drum 108 to a width capable of excavating. At this time, a large number of the cutter bits 109 are used to cut the asphalt. The roadbed is crushed into pebbles,
Post-processing can be done easily. If the asphalt roadbed is removed in such a width that can be excavated in this way, the working machine coupler 1
Since the excavation of the ground can be performed by changing the bucket to 06, the asphalt roadbed can be removed and excavated continuously by the same work machine, and the work efficiency can be improved.

On the other hand, the latter device is a paving surface cutting machine as shown in FIG. 21 and FIG. 22, in which a bracket 201 is hydraulically driven via an arm to a hydraulic working machine main body (not shown). The rotary shaft 203 is driven by the hydraulic motor 202 attached to the bracket 201,
The disc 204 attached to the rotary shaft 203 is rotated. Here, the rotating surface 204 of this disc 204
In A, a large number of cutting teeth 205 are arranged and attached so as to make even contact with the paved surface as a whole.

According to this cutting machine, while avoiding obstacles such as manholes, water shutoff valves, gas valves, and buried signs existing on the pavement surface, the pavement surface around these obstacles is evenly and finely cut. It can be performed.

[0007]

However, these conventional devices have the following problems.

First, in the hydraulic excavator shown in FIG. 20, the asphalt cutter device 107 cuts the pavement surface in a straight line, so that if there is an obstacle such as a manhole in the middle, its use is limited, and these In the obstacle part, it is necessary to dig by hand with a hand breaker or the like, resulting in a significant decrease in work efficiency.

Further, when excavating after cutting, it is necessary to replace the asphalt cutter device 107 and the bucket, which is troublesome.

Further, although the asphalt cutter device 107 has a lot of noise and vibration, this kind of construction is often performed especially at night, and depending on the construction site, the free construction may be restricted due to legal regulations. Therefore, reduction of such noise and vibration is a serious problem.

On the other hand, the pavement surface cutting machine shown in FIGS. 21 and 22 has cutting teeth 205 provided on the surface 204A of the disc 204 and can only perform cutting work. Therefore, including the case where the cutting portion is dug deeper. The excavation work needs to be performed again with another device, resulting in poor work efficiency.

Focusing on these problems, the present invention provides an end mill for excavation and an excavation device which have low noise and low vibration, and can greatly improve the efficiency and degree of freedom of excavation and cutting work on a pavement surface. The purpose is to

[0013]

According to a first aspect of the present invention, there is provided an end mill for excavation, which comprises an excavation surface having an excavation bit formed at a tip of an end mill body and a cutting surface having a cutting bit formed on an outer peripheral side surface. In addition, the cutting surface is provided with a plurality of bit rows arranged on the outer peripheral surface of the end mill in parallel with the rotation axis at a predetermined interval, and the mounting positions of the cutting bits of each bit row are out of phase with each other in the rotation axis direction for each bit row. It was

According to a second aspect of the invention, a passage for introducing pressurized water or pressurized air is provided inside the end mill body, and a blowout hole for ejecting pressurized water or air is formed near the tip of the end mill by connecting to this passage.

A third aspect of the present invention includes a positioning bit that extends from the excavation surface coaxially with the rotation axis of the end mill.

In a fourth aspect of the invention, the cutting bit is in line contact with a surface to be cut.

In a fifth aspect of the present invention, the cutting bit has a flat surface that faces upward with respect to the rotation direction of the end mill.

A sixth aspect of the present invention uniformly includes the excavating bit having a blade surface in the forward rotation direction of the end mill and the excavating bit having a blade surface in the reverse rotation direction of the end mill.

In a seventh aspect of the invention, the excavating bit is provided with a blade surface in both the forward rotation direction and the reverse rotation direction of the end mill.

An eighth aspect of the present invention uniformly includes the cutting bit having a blade surface in the forward rotation direction of the end mill and the cutting bit having a blade surface in the reverse rotation direction of the end mill.

In a ninth aspect of the invention, the cutting bit is provided with a blade surface in both the normal rotation direction and the reverse rotation direction of the end mill.

A tenth aspect of the invention is to provide a hydraulic working machine main body driven hydraulically, an arm provided on the hydraulic working machine main body,
A hydraulic motor detachably attached to the holder of the arm, and means for supplying hydraulic pressure from a hydraulic source of the hydraulic working machine body to the hydraulic motor, and the invention according to any one of the first to ninth aspects. The end mill is driven to rotate by the hydraulic motor.

In an eleventh aspect, the hydraulic motor is attached to the holder via a buffer member.

[0024]

According to the first aspect of the present invention, the end surface of the end mill excavates and the side surface of the cutting surface is used to perform both hole excavation perpendicular to the pavement surface and cutting in parallel with the pavement surface with one end mill. obtain. At this time, the plurality of bit rows arranged on the side surface of the end mill and the cutting bits whose phases are shifted for each bit row perform uniform cutting in the entire axial range of the end mill as the end mill rotates.

According to the second aspect of the present invention, during the excavation and cutting operations, water or air ejected from the blowout holes can remove excavated particles and the like, and at the same time, the cooling of the end mill is promoted.

In the third invention, the positioning bit extends from the excavation surface coaxially with the rotation axis of the end mill, and when the end mill is rotated during excavation work, its position is kept at the center of the excavation surface. As a result of rotating around the rotation axis and always excavating the paving surface in advance of the excavation bit provided on the excavation surface, the end mill is supported by the positioning bit at a predetermined excavation position on the paving surface, Since the horizontal positioning with respect to the surface is perfectly performed, the position of the end mill does not deviate due to the reaction force received from the pavement surface during excavation by the excavation bit, and the accuracy of the hole diameter of the excavation hole can be improved.

According to the fourth aspect of the invention, since the cutting bit is constructed so as to make line contact with the surface to be cut, the cutting bit does not cause unevenness on the cutting surface, and the roughness of the cutting surface becomes small and the cutting surface is cut. The finished surface is improved.

In the fifth aspect of the invention, when the end mill is rotated to perform a cutting operation, the plane provided on the cutting bit so as to face upward with respect to the rotation direction of the end mill raises the cutting waste generated by the cutting. Since it bounces up and is discharged to the outside from the hole that has been cut, cutting chips do not accumulate in the hole that was cut, and the contact between the cutting bit and the surface to be cut is maintained smoothly. , Cutting efficiency does not decrease.

In the sixth aspect of the invention, since the excavating bit having the blade surface oriented in the forward rotation direction of the end mill and the excavating bit having the blade surface oriented in the reverse rotation direction of the end mill are evenly provided, the excavation work is performed by the end mill. Can be performed without lowering the excavation efficiency regardless of the direction of rotation, and the degree of freedom of excavation work can be increased.

In the seventh aspect of the invention, each excavating bit is provided with a blade surface facing both the forward and reverse rotating directions of the end mill, so that the excavating work does not lower the excavating efficiency regardless of the rotating direction of the end mill. It is possible to increase the degree of freedom of excavation work.

In the eighth aspect of the invention, since the cutting bit having the blade surface oriented in the forward rotation direction of the end mill and the cutting bit having the blade surface oriented in the reverse rotation direction of the end mill are evenly provided, the cutting work is performed in the end mill. It can be performed without lowering the cutting efficiency regardless of the rotation direction of, and the degree of freedom of cutting work can be increased.

In the ninth aspect of the invention, each cutting bit is provided with a blade surface oriented in both the forward and reverse rotation directions of the end mill, so that the cutting work does not reduce the cutting efficiency regardless of the rotation direction of the end mill. It can be done and the degree of freedom of cutting work is increased.

In the tenth aspect of the invention, while operating the arm of the hydraulic working machine, excavation and cutting of a pavement surface and the like are performed by an end mill which is rotationally driven by a hydraulic motor mounted at the tip of the arm. Since the excavation is performed by an end mill that is rotationally driven by a hydraulic motor, noise and vibration associated with excavation and cutting of the pavement surface can be minimized.

Further, since the hydraulic oil for driving the hydraulic motor is supplied from the hydraulic source of the hydraulic working machine, it is not necessary to provide a drive source for the hydraulic motor, and the end mill can be freely attached and detached together with the hydraulic motor. Therefore, by exchanging another excavating tool or the like with the arm as necessary, it is possible to exert other functions as a hydraulic working machine. In the eleventh aspect of the invention, since the hydraulic motor is supported via the buffer member, vibrations and impacts during cutting and excavation are less likely to be transmitted to the working machine body, the work of the working machine body is stabilized, and the motor is used during excavation. The impact on the shaft is weakened.

[0035]

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

As shown in FIG. 1, a hydraulic motor 3 is detachably attached to a holder 5 at the tip of an arm 2 of a hydraulic working machine body 1 such as a power shovel. As shown in detail in FIG. 2, an end mill 4 for excavating and cutting a pavement surface is coaxially attached to a motor shaft 3A of the hydraulic motor 3.

The arm 2 is an arm portion 2A connected to each other,
2B, the holder 5 is provided at the tip thereof, and is bent at an arbitrary angle by the expansion and contraction operations of the plurality of hydraulic cylinders 6A, 6B, 6C.

The hydraulic motor 3 is fixed to the holder 5 by bolts or the like fastened to the flange portion 3B, and on the other hand, together with the hydraulic cylinders 6A, 6B, 6C, etc., the main body 1 of the hydraulic working machine.
Received the supply of hydraulic oil from a hydraulic power source (not shown)
The end mill 4 is rotationally driven.

The hydraulic motor 3 controls the supply of hydraulic oil via a control valve, a pipe and a connecting plug (not shown).

As shown in FIG. 3, the end mill 4 comprises an end mill body 7 to which a bit, which is a cutting tool for excavation or cutting, is attached, and a connecting shaft portion 8 which is connected to the shaft 3A of the hydraulic motor 3. This coupling shaft portion 8 is used for the hydraulic motor 3
The shaft 3A is integrally supported by a fastening means such as a spline or a screw, and the rotation of the hydraulic motor shaft 3A is transmitted to the end mill 4.

An excavation surface 11 perpendicular to the axis of rotation of the end mill 4 is formed on the tip end surface of the end mill body 7, and a cutting surface 12 is formed on the outer peripheral side surface thereof.

In this embodiment, as shown in FIG. 4, the shape of the end mill 4 is basically a square pole, and the excavation surface 11 at the tip is square. Excavation bits 21A are fixed to the respective vertices of this square, and plural excavation bits 21B are also fixed near the center of the excavation surface 11. These drill bits 21A, 21B
As shown in FIG. 5, is fixed to the end mill 4 so that a part of the end mill 4 is embedded, and the rotation of the end mill 4 excavates a hole perpendicular to the pavement surface.

The cutting surface 1 on the outer peripheral side surface of the end mill 4
In reference numeral 2, a plurality of cutting bits 22 are embedded in four rows along each side of the quadrangular prism at predetermined intervals in the axial direction, and these four bit rows are formed. Each cutting bit 22 is the end mill body 7 of the end mill 4 shown in FIG.
As shown as a developed view of, the positions in the axial direction, that is, the phases are arranged to be shifted for each bit string.

These cutting bits 22 are advanced in parallel with the pavement surface while rotating the end mill 4,
The pavement surface is cut or cut, and the phases of the cutting bits 22 are shifted at this time, which enables uniform cutting in the entire axial range of the end mill 4.

Further, a passage 15 is provided near the center axis of the end mill 4, pressurized water or pressurized air is supplied through the passage 15, and water or air is ejected from a blowout hole 16 provided near the tip of the end mill 4. Then, excavated particles are removed and cooled.

As shown in FIG. 7, a cushioning member such as a vibration isolating rubber 5A may be provided in a part of the holder 5. That is, the support plate 5C of the holder 5 to which the flange portion 3B of the hydraulic motor 3 is attached is joined to the cylindrical holder body 5B via the vibration-proof rubber 5A, whereby vibrations and impacts during cutting and excavation are achieved. Is less likely to be transmitted to the working machine body 1, the work of the working machine body 1 is stabilized, and an impact load can be prevented from being applied to the shaft of the motor 3 during excavation.

Next, the operation will be described.

In excavating the paved surface, first, the hydraulic cylinders 6A, 6B and 6C are expanded and contracted to operate the arm 2 to move the end mill 4 rotated by the hydraulic motor 3 to a predetermined excavation site.

Set the end mill 4 perpendicular to the pavement surface,
By pushing it while rotating it vertically,
It is possible to dig a digging hole by the digging bits 21A and 21B, and if the arm 2 is moved in parallel with the paving surface while the end mill 4 is held vertically, one of the cutting surfaces can be obtained.
The cutting bit 22 of 2 can cut or cut the pavement surface with a predetermined depth and width.

Therefore, as a method of excavation work, a number of excavation holes are sequentially formed with a uniform distribution by the end mill 4 over a predetermined excavation range, and then the excavation range is excavated or the excavation range is excavated. Then, the end mill 4 is moved in parallel with the paved surface, the paved surface is cut, a number of vertical drill holes are formed inside the area, and excavation is performed.

Thus, according to the excavating device of the present invention,
Both the excavation and the cutting work can be performed by one end mill 4, and the functions of the concrete cutter and the breaker in the conventional construction can be combined, so that the working efficiency can be significantly improved.

Furthermore, during the excavation and cutting work, the paving surface is crushed by the rotation of the end mill 4, and it is not necessary to use a device such as a concrete cutter or a breaker which gives a violent vibration or a shock, so that noise or vibration is generated. It can be kept to a minimum. In this case, since the rotation of the end mill 4 is performed by the hydraulic motor 3 with less noise, it is more effective for quieting.

The hydraulic motor 3 is supported via a rubber vibration isolator 5A, and the working machine body 1 receives the impact and vibration of the end mill 4.
Can reduce the transmission to. Further, noise is suppressed by absorbing vibrations by the vibration isolating rubber 5A.

Further, the end mill 4 can take any posture based on the operation of the arm 2, and it is also possible to change the advancing direction of the end mill 4 at the time of cutting. Therefore, excavation and cutting work with a high degree of freedom is possible. It can be performed. Therefore, the work is unlikely to be limited by the cutting place as in the case of using a conventional concrete cutter.

Further, since the cutting bits 22 are arranged out of phase with each other for each bit row, the rotation of the end mill 4 makes uniform cutting in the entire axial range of the end mill body 7, thus improving the cutting efficiency. . The end mill 4 is cooled by the water or air passing through the passage 15 to prevent its temperature from rising, and by ejecting these water or air from the blowout holes 16 while the end mill 4 is rotating, it is possible to remove excavated particles, etc. The efficiency is increased, and wear of the drill bits 21A and 21B and the cutting bit 22 is suppressed.

By the way, since the hydraulic motor 3 is driven by the hydraulic pressure supplied from the hydraulic working machine 1, it is not necessary to provide a special drive source for the hydraulic motor 3. Further, since the hydraulic motor 3 and the end mill 4 are freely attachable / detachable, other devices can be attached to the arm 2, and excavation and loading can be continued by attaching, for example, a shovel to one hydraulic working machine. Various operations are possible with.

8 and 9 show another embodiment of the present invention.

As shown, in this embodiment,
The end mill body 7 of the end mill 4 having the same configuration as in FIGS. 3 to 6 has a cone-shaped positioning bit 3 at the center of the excavation surface 11.
1 is provided. Since the positioning bit 31 extends coaxially with the rotation axis of the end mill 4, when the end mill 4 is rotated during excavation work, the positioning bit 31 rotates about the rotation axis while keeping its position at the center of the excavation surface 11. Then, the other excavation bits 21A and 21B of the excavation surface 11 come into contact with the paving surface before they come into contact with the paving surface to be excavated, and the paving surface is excavated along the rotation axis direction from the contact point with the paving surface. I will do it.

As described above, since the positioning bit 31 always excavates at a predetermined portion of the pavement surface to be excavated prior to the other excavation bits 21A and 21B, the end mill 4 uses the positioning bit 31 to pave the surface. It is supported at a predetermined excavation position in (1) and is perfectly positioned in the horizontal direction with respect to the pavement surface. Therefore, the position of the end mill 4 does not shift due to the reaction force received from the pavement surface during excavation by the other excavation bits 21A and 21B. Therefore, the size of the excavation hole does not become larger than the diameter of the end mill 4, and the accuracy of the excavation hole diameter can be improved.

As shown in FIGS. 10 to 12, instead of the excavating bits 21A and 21B and the positioning bit 31 shown in FIGS. 8 and 9, four excavating bits 32 provided on the excavating surface 11 are excavated. It is also possible to construct the positioning bit 33 at the intersection of these excavation bits 32 by extending from the circumference of the surface 11 toward the center to form a cone. With this configuration, it is not necessary to separately provide the positioning bit, and the configuration can be simplified.

FIGS. 13 and 14 show still another embodiment of the present invention.

In this embodiment, as the cutting bit provided on the cutting surface 12 of the end mill body 7, a rectangular plate-shaped cutting bit 34 is provided instead of the conical cutting bit 22 as shown in FIGS. , This plate-shaped cutting bit 34
The outer peripheral side of the end mill 4 is parallel to the rotation axis of the end mill 4. As a result, the contact between the cutting bit 34 and the pavement surface during cutting is a line contact along the rotation axis direction of the end mill, so that the roughness (unevenness) of the surface cut by the cutting bit 34 can be reduced. ,
The finish of the side surface of the cut hole is improved.

Also in this case, as shown in FIG. 14, since the respective cutting bits 34 are arranged so as to be out of phase with each other on the cutting surface 12, the axial direction of the end mill 4 is also changed.
The roughness (unevenness) of the cut surface can be reduced.

Further, such a plate-shaped cutting bit 34
As shown in FIG. 15 and FIG.
If the cutting bits 34 are arranged so as to be inclined at a predetermined angle such that 5 is obliquely upward with respect to the rotation direction of the end mill 4, each cutting bit 34 is rotated by the rotation of the end mill 4.
It is possible to flip up the cutting wastes of the pavement surface generated by the cutting along the flat surface portion 35. As a result, most of the cutting waste can be discharged to the outside of the cut hole while performing the cutting work, so that the cutting waste will not be accumulated in the cut hole and the cutting bit 34 and The contact with the paved surface to be cut is maintained smoothly, and the cutting efficiency is not reduced.

17 to 19 show still another embodiment of the present invention.

In this embodiment, the end mill is rotatable in both forward and reverse directions, and the excavation bit 41 on the circumference of the excavation surface 11, the excavation bit 42 in the excavation surface 11, and the cutting bit 43 are Each of the drill bits 41, 42, and the cutting bit 43 is provided with a blade surface 51, 52, 53 that is to be actually excavated or cut in a specific direction. Are arranged so as to be evenly oriented in both the forward and reverse rotation directions.

Specifically, the four excavating bits 41 provided on the circumference of the excavating surface 11 have their blade surfaces 51 oriented in the normal rotation direction of the end mill and those oriented in the reverse rotation direction. And are arranged so as to be alternately repeated. In addition, regarding the four excavating bits 42 provided in the excavation surface 11, the one in which the blade surface 52 faces the forward rotation direction and the other in which the blade surface 52 faces the reverse rotation direction are the rotation directions of the end mill 4. Are alternately arranged with respect to each other.

Further, a cutting bit 43 forming four rows of bits on the cutting surface 12 of the end mill body 7 in the direction of the rotation axis.
In each bit string, the blade surface 53 facing in the forward rotation direction and the blade surface 53 facing in the reverse rotation direction are alternately arranged.

In this way, the excavating bits 41, 42 and the cutting bit 43 have the blade surfaces 51, 52, 53 oriented in the forward rotation direction and the blade surfaces 51, 52, 53 oriented in the reverse rotation direction. If they are even with each other (for example, alternately provided as in the present embodiment), the excavating bit 4 having the blade surfaces 51, 52, 53 only in one specific direction.
Even if the 1, 42 and the cutting bit 43 are used, the excavation and cutting work by the excavating bits 41, 42 and the cutting bit 43 can be performed in exactly the same manner by the normal rotation and the reverse rotation of the end mill 4, and both the forward and reverse directions can be performed. Since the excavation efficiency and the cutting efficiency do not decrease even in the rotation direction of, the degree of freedom of the excavation work and the cutting work can be increased.

In order to deal with the rotation of the end mill 4 in both the forward and reverse directions, each excavating bit and cutting bit may be provided with two blade surfaces, one in the forward rotation direction and one in the reverse rotation direction. . With this, the end mill 4
The excavability and the machinability do not deteriorate with respect to the rotation in both the forward and reverse directions, and the degree of freedom of work is enhanced.

[0071]

According to the first aspect of the invention, the excavation surface at the tip of the end mill and the cutting surface on the side surface allow for the drilling of holes perpendicular to the pavement surface and the cutting progressing parallel to the pavement surface with one end mill. Both can be done and work efficiency can be greatly improved. In addition, the multiple bit rows arranged on the side surface of the end mill and the cutting bits whose phases are shifted for each bit row perform uniform cutting in the entire axial range of the end mill as the end mill rotates. You can increase efficiency.

According to the second aspect of the present invention, during excavation and cutting work, water or air ejected from the blow-out holes can remove excavated particles and the like, while at the same time promoting the cooling of the end mill and suppressing wear of the cutting bit. You can improve the sex.

According to the third invention, the positioning bit extends from the excavation surface coaxially with the rotation axis of the end mill, and when the end mill is rotated during excavation work, the position is kept at the center of the excavation surface. The end mill is supported by the positioning bit at a predetermined excavation position on the pavement surface as a result of rotating around the rotation axis while keeping it still and always excavating the pavement surface in advance of the excavation bit provided on the excavation surface. ,
Since the horizontal positioning with respect to the pavement surface is perfectly performed, the end mill will not be displaced even by the reaction force received from the pavement surface when excavating with the drill bit, and the accuracy of the drill hole diameter can be improved. .

According to the fourth aspect of the invention, since the cutting bit is configured to come into line contact with the surface to be cut, the cutting surface by the cutting bit does not have unevenness, and the roughness of the cutting surface is small. , The finish of the cut finished surface is improved.

According to the fifth aspect of the present invention, when excavation and cutting work is performed by rotating the end mill, a plane provided on the cutting bit so as to face upward with respect to the rotation direction of the end mill is provided by excavation and cutting. The generated cutting waste is jumped up and discharged from the cut hole to the outside, so that the cutting waste does not accumulate in the cut hole, and the cutting bit contacts the surface to be cut. Is kept smooth and cutting efficiency does not decrease.

According to the sixth aspect of the invention, since the excavating bit having the blade surface oriented in the forward rotation direction of the end mill and the excavating bit having the blade surface oriented in the reverse rotation direction of the end mill are evenly provided, the excavation work is performed. Can be performed without lowering the excavation efficiency regardless of the rotation direction of the end mill, and the degree of freedom of excavation work can be increased.

According to the seventh aspect of the invention, since each excavating bit is provided with the blade surface facing both the forward and reverse rotational directions of the end mill, the excavating work reduces the excavating efficiency regardless of the rotational direction of the end mill. It can be performed without any need, and the degree of freedom of excavation work is increased.

According to the eighth aspect of the invention, since the cutting bit whose blade surface is oriented in the forward rotation direction of the end mill and the cutting bit whose blade surface is oriented in the reverse rotation direction of the end mill are evenly provided, the cutting work is performed. Can be performed without lowering the cutting efficiency regardless of the rotation direction of the end mill, and the degree of freedom of cutting work can be increased.

According to the ninth aspect of the invention, each cutting bit is provided with a blade surface facing both the forward and reverse rotation directions of the end mill, so that the cutting work reduces the cutting efficiency regardless of the rotation direction of the end mill. Can be performed without any need, and the degree of freedom in cutting work is increased.

According to the tenth aspect of the present invention, while operating the arm, the end mill rotatably driven by the hydraulic motor mounted at the tip of the arm excavates and cuts the pavement surface, etc. Noise and vibration associated with cutting can be minimized, and the end mill can be controlled in any posture and direction based on the operation of the arm, which enables excavation and cutting work with a high degree of freedom. Further, since the hydraulic oil for driving the hydraulic motor is supplied from the hydraulic source of the hydraulic working machine, it is not necessary to provide a special drive source for the hydraulic motor.
Furthermore, since the end mill can be freely attached and detached together with the hydraulic motor, other functions as a hydraulic working machine can be exerted by replacing other excavating tools or the like with the arm as required.

In the eleventh aspect of the invention, since the hydraulic motor is supported via the cushioning member, vibrations and impacts during cutting and excavation are less likely to be transmitted to the working machine body, and the work of the working machine body is stabilized. At the same time, an impact load is prevented from being applied to the shaft of the motor during excavation.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a side view showing a state in which the end mill is also attached to the hydraulic motor.

FIG. 3 is a side view showing an end mill of the same.

FIG. 4 is a front view of the same.

5 is a sectional view of the end mill body, which is taken along the line AOA ′ in FIG.

FIG. 6 is a development view of the end mill body.

FIG. 7 is a sectional view showing another embodiment of the same.

FIG. 8 is a side view showing an end mill according to still another embodiment of the present invention.

FIG. 9 is a front view of the same.

FIG. 10 is a side view showing an end mill according to still another embodiment.

FIG. 11 is a front view of the same.

FIG. 12 is a development view of the end mill body.

FIG. 13 is a side view showing an end mill according to still another embodiment.

FIG. 14 is a development view of the end mill body.

FIG. 15 is a side view showing an end mill according to still another embodiment.

FIG. 16 is a development view of the end mill body.

FIG. 17 is a side view showing an end mill according to still another embodiment of the present invention.

FIG. 18 is a front view of the same.

FIG. 19 is a development view of the end mill body.

FIG. 20 is a side view showing a conventional cutting device.

FIG. 21 is a side view showing another conventional cutting device.

FIG. 22 is a plan view showing another conventional cutting device.

[Explanation of symbols]

 1 Hydraulic Working Machine Main Body 2 Arm 3 Hydraulic Motor 4 End Mill 5A Anti-vibration Rubber 7 End Mill Main Body 11 Excavation Surface 12 Cutting Surface 15 Passage 16 Blowing Hole 21A Excavation Bit 21B Excavation Bit 22 Cutting Bit 31 Positioning Bit 32 Excavation Bit 33 Positioning Bit 34 Cutting Bit 35 Flat Surface 41 Excavation Bit 42 Excavation Bit 43 Cutting Bit 51 Blade Face 52 Blade Face 53 Blade Face

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Hideaki Shinohara 2-4-1 Hamamatsucho, Minato-ku, Tokyo World Trade Center Building Kayaba Industry Co., Ltd. (72) Atsushi Kugenuma Atsushi Hamamatsu-cho, Minato-ku, Tokyo 4-1-1 World Trade Center Building Kayaba Industry Co., Ltd. (72) Inventor Ken Ichiyanagi 650 Kazunachicho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. Technical Research Laboratory (72) Inventor Shuji Ohira Shinchi-shi, Ibaraki 650, Machi, Hitachi Construction Machinery Co., Ltd.Technical Research Laboratory (72) Inventor, Masami Ochiai, 650, Kazunachicho, Tsuchiura City, Ibaraki Pref., Hitachi Construction Machinery Co., Ltd.

Claims (11)

[Claims] 1. An excavation surface having an excavation bit formed at a tip of an end mill body, and a cutting surface having a cutting bit formed on an outer peripheral side surface, wherein the cutting surface is parallel to a rotation axis on an outer peripheral surface of the end mill. An end mill for excavation, comprising a plurality of bit strings arranged at predetermined intervals, wherein the cutting bit mounting positions of the bit strings are shifted in phase in the rotational axis direction for each bit string. 2. The end mill body according to claim 1, wherein a passage for introducing pressurized water or pressurized air is provided inside the end mill body, and a blowout hole for ejecting the pressurized water or air is formed near the tip of the end mill by connecting to the passage. End mill for excavation. 3. The excavating end mill according to claim 1, further comprising a positioning bit extending from the excavating surface coaxially with a rotation axis of the end mill. 4. The end mill for excavation according to claim 1, wherein the cutting bit is in line contact with a surface to be cut. 5. The excavating end mill according to any one of claims 1 to 4, wherein the cutting bit has a flat surface that faces upward with respect to a rotation direction of the end mill. 6. The drill bit having a blade surface in the forward rotation direction of the end mill and the drill bit having a blade surface in the reverse rotation direction of the end mill are evenly provided. The end mill for excavation according to any one of claims 1 to 5. 7. The excavating bit according to claim 1, wherein the excavating bit is provided with a blade surface in both a forward rotation direction and a reverse rotation direction of the end mill. End mill. 8. The cutting bit having a blade surface in the forward rotation direction of the end mill and the cutting bit having a blade surface in the reverse rotation direction of the end mill are evenly provided. The end mill for excavation according to any one of claims 1 to 7. 9. The excavating tool according to claim 1, wherein the cutting bit is provided with a blade surface in both a forward rotation direction and a reverse rotation direction of the end mill. End mill. 10. A hydraulic working machine main body driven hydraulically, an arm provided on the hydraulic working machine main body, a hydraulic motor detachably mounted on a holder of the arm, and a hydraulic power source of the hydraulic working machine main body. And a means for supplying the hydraulic pressure to the hydraulic motor, and the end mill according to any one of claims 1 to 9 is rotationally driven by the hydraulic motor. 11. The excavator according to claim 10, wherein the hydraulic motor is attached to the holder via a buffer member.