JP4502480B2 - Excavation tool and wear-resistant member - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to excavation tools and wear-resistant members, and in particular, wear resistance applicable to various applications such as excavation tools including cutter chips using a hard material such as cemented carbide and cutter chips. It relates to a sex member.
[0002]
[Prior art]
Conventionally, what was disclosed by patent 2901202 is known as a technique of such a field | area. This publication describes a wear-resistant member in which a plurality of pipe materials into which hard materials are inserted are bundled and integrated. When manufacturing this wear-resistant member, a rod-shaped hard material made of cemented carbide or the like is inserted into a tube material made of metal or the like. Further, a plurality of pipe materials in which such hard materials are inserted are bundled. Then, a brazing material is placed on the upper part of the opening of the tube material assembly, and a brazing atmosphere is created around the tube material assembly in a continuous hydrogen furnace or the like. Thereby, inside each pipe material, the hard material and the inner peripheral surface of the pipe material are brazed to each other adjacent pipe materials at the contact portion between the pipe materials.
[0003]
[Problems to be solved by the invention]
In a wear-resistant member as described above, when a large impact is applied to the entire member, the force due to the impact acts in a distributed manner on each of the hard materials inside each tube material. Therefore, the impact acting on the hard material inside each pipe material is small, and even if a break (crack) or the like occurs in the hard material inside each pipe material, there is very little possibility that the entire wear-resistant member will break. . However, when the wear-resistant member configured as described above is applied as, for example, a cutter tip of an excavation tool for excavating concrete obstacle ground or the like, the following problems occur.
[0004]
That is, when excavating concrete obstacle ground or the like, obstacles such as steel frames and reinforcing bars such as H steel piles and PC piles are irregularly present in the ground. Therefore, even if the excavation direction of the excavation tool (cutter tip) is kept constant, an obstacle collides with the cutter tip from a random direction. And when the obstacle collides with the cutter tip from a random direction in this way, at the corner of the cutter tip, the tube material and the internal hard material are peeled off, and the tube material into which the hard material is inserted is peeled off. There was a case. In this respect, the conventional wear-resistant member, that is, the cutter tip of the excavating tool has a problem in terms of durability.
[0005]
Accordingly, an object of the present invention is to provide an excavation tool capable of easily extending the life of a cutter tip and a wear-resistant member capable of easily extending the life.
[0006]
[Means for Solving the Problems]
The excavation tool according to the present invention is an excavation tool having a cutter tip made of a wear-resistant member obtained by bundling a plurality of pipes into which hard materials are inserted, and the cutter tip has a negative rake angle with respect to the excavation direction, And it has a blade part formed so that a clearance angle can be made positive, and the side which makes an obtuse angle with the cutting edge provided in the blade part in at least any one side part of a cutter tip And a front surface facing the excavation direction is smoothly continuous with the front surface of the shank while being inclined with respect to the rake face forming the rake angle , and the hard material is connected to the blade part and the side. In addition, the outer peripheral surface is held by the shank while being exposed to the inclined surface of the part, and the pipe material is housed in the shank.
[0007]
This excavation tool is suitable for use when excavating concrete obstacle ground or the like, for example, and has a cutter tip made of a wear-resistant member. The wear-resistant member is formed by bundling and integrating a plurality of pipe materials into which hard materials are inserted. In this case, the upper surface (the rake face of the blade portion) of the wear resistant member is formed flat, for example. Further, a first inclined surface (flank of the blade portion) is formed on the wear-resistant member so as to form an obtuse angle with the upper surface. Thereby, the rake face of the blade part of the cutter tip becomes flat. Further, the cutting edge of the blade portion is provided at the boundary between the rake face (upper surface) and the flank face (first inclined surface), and the direction substantially perpendicular to the cutting edge is the excavation direction of the excavation tool. Further, a second inclined surface is formed on the side portion of the wear-resistant member so as to make an obtuse angle with the boundary between the upper surface (rake surface) and the first inclined surface (flank surface), that is, the cutting edge of the blade portion. Is formed. Thereby, an excavation tool has an inclined surface which makes an obtuse angle with a cutting edge in at least any one side part.
[0008]
The excavation tool configured as described above has a blade portion that can make the rake angle with respect to the excavation direction negative and can make the clearance angle positive. And it is possible to easily reduce the breakage of the cutter tip by keeping the rake angle negative during excavation while keeping the direction perpendicular to the cutting edge constant as the excavation direction with respect to the work target. . Further, excavation resistance can be reduced by keeping the clearance angle positive.
[0009]
Here, for example, when excavating concrete obstacle ground etc., various obstacles exist irregularly in the ground, so even if the excavation direction is kept constant, , Obstacles will collide from random directions. On the other hand, in this excavation tool, the inclined surface which makes an obtuse angle with the cutting edge of a blade part is formed in the at least any one side part of a cutter chip. Therefore, even if the obstacle collides with the blade part from a direction different from the original excavation direction, the inclined surface functions as a flank surface. In addition, it is possible to very effectively prevent the pipe materials into which the hard material is inserted from being separated. Therefore, according to this excavation tool, it is possible to easily extend the life of the cutter tip even when an object to be cut in which obstacles exist irregularly is excavated.
[0010]
The wear-resistant member according to the present invention comprises a flat rake face and an obtuse angle with the rake face in a wear-resistant member that forms a cutter tip by bundling and integrating a plurality of pipe materials into which hard materials are inserted. A flank formed on the rake face, a cutting edge formed by the rake face and the flank face, and a side inclined surface formed on at least one side so as to form an obtuse angle, the rake face is the flank and front inclined surface continuous smooth and the front of the front carboxymethyl Yanku being inclined at different angles in a manner to reduce the obtuse angle between the front of the shank facing the drilling direction of said cutter tip is interposed The hard material is exposed on the rake surface , the flank surface , the side inclined surface, and the front inclined surface , and the outer peripheral surface of the tube material is held by the shank while the tube material is housed in the shank. Features.
[0011]
The excavation tool according to the present invention is an excavation tool having a cutter tip made of a wear-resistant member obtained by bundling a plurality of pipes into which hard materials are inserted, and the cutter tip has a negative rake angle with respect to the excavation direction, And it has a blade part formed so that a clearance angle can be made positive, and while the hard material is exposed to the blade part, the outer peripheral surface of the pipe member is built in the shank. A protection member for protecting the blade part while having an inclined surface that forms an obtuse angle continuously to the cutting edge provided on the blade part on at least one side part of the cutter tip held by the shank. It is provided.
[0012]
This excavation tool is also suitable for use when excavating concrete obstacle ground or the like, for example, and has a cutter tip made of a wear-resistant member. The wear-resistant member is formed by bundling and integrating a plurality of pipe materials into which hard materials are inserted. In this case, the upper surface (the rake face of the blade portion) of the wear resistant member is formed flat, for example. In addition, an inclined surface (flank of the blade portion) is formed on the wear-resistant member so as to make an obtuse angle with the upper surface. Thereby, the rake face of the blade part of the cutter tip becomes flat. In addition, the cutting edge of the cutter tip is provided at the boundary between the rake face and the flank face, and the direction perpendicular to the cutting edge is the excavating direction of the excavating tool. Furthermore, a protection member for protecting the blade portion is provided on at least one of the wear-resistant members, that is, the side portions of the cutter tip.
[0013]
The excavation tool configured in this way also has a blade portion that can make the rake angle relative to the excavation direction negative and make the clearance angle positive. And it is possible to easily reduce the breakage of the cutter tip by keeping the rake angle negative during excavation while keeping the direction perpendicular to the cutting edge constant as the excavation direction with respect to the work target. . Further, excavation resistance can be reduced by keeping the clearance angle positive.
[0014]
Furthermore, for example, when excavating concrete obstacle ground or the like, even if the excavation direction is kept constant, obstacles collide with the cutter chip from a random direction. The cover member is covered with a protective member that protects the blade portion. Therefore, in a corner or the like, it is extremely effectively prevented that the pipe material and the internal hard material are separated from each other and the pipe material into which the hard material is inserted is peeled off. Therefore, even with this excavation tool, even if a work object in which an obstacle is present irregularly is excavated, it is possible to easily extend the life of the cutter tip.
[0015]
Wear resistant member according to the present invention, by integrally bundling a plurality of tubing was inserted into the hard material in the wear resistant members constituting the cutter tip, and a flat rake face, so as to form the rake face at an obtuse angle has a flank formed, the hard material, to expose said rake face and said flank face, the outer peripheral surface is held in the shank while interior of the tube member to the shank, at least one The one side portion has a protective member that covers the side portion while having an inclined surface continuously forming an obtuse angle with a cutting edge formed by the rake surface and the flank surface. To do.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of an excavation tool and wear-resistant member according to the present invention will be described in detail with reference to the drawings.
[0017]
[First Embodiment]
FIG. 1 is a schematic configuration diagram showing a first embodiment of an excavation tool according to the present invention. FIG. 2 is a front view of the excavation tool according to the first embodiment viewed from the II direction in FIG. The excavation tool 1 shown in these drawings is suitable for use when excavating concrete obstacle ground or the like, for example, and has a cutter tip 10 held by a shank 30. The cutter chip 10 is composed of a wear-resistant member M obtained by bundling and integrating a plurality of tube materials 12 in which hard materials 11 are inserted (see FIG. 2). In this case, as the hard material 11, for example, a cemented carbide, cermet, ceramic or the like formed into a rod shape is used. Moreover, as the pipe material 12, what consists of metals, such as 50% Fe-50% Ni, etc., and has cross-sectional shapes, such as circular, a rectangle, a polygon, is used, for example.
[0018]
When manufacturing the wear-resistant member M constituting the cutter chip 10, first, the hard material 11 is inserted into the plurality of tube materials 12, and a plurality of tube materials 12 into which the hard material 11 is inserted are bundled. Then, a brazing material 13 such as silver brazing is placed on the upper part of the opening of the aggregate of the tube material 12 so that a brazing atmosphere is formed around the aggregate of the tube material 12 in a continuous hydrogen furnace or the like. Thereby, in each tube material 12, the hard material 11 and the inner peripheral surface of the tube material 12 are brazed between the tube materials 12 adjacent to each other at the contact portion between the tube materials 12, and each hard material 11, Each pipe material 12 grade | etc., Is integrated easily.
[0019]
In the wear-resistant member M configured as described above, a hard material 11 obtained by forming a cemented carbide, cermet, ceramic, or the like into a small-diameter bar shape is used. Further, during the brazing operation, the outer periphery of each hard material 11 is covered with a tube material 12 such as metal. As a result, in various members using the wear-resistant member M, even if a breakage (crack) occurs in some hard materials 11, the breakage remains in the block and does not lead to the entire breakage. Life can be easily extended.
[0020]
The cutter tip 10 is formed in such a manner that the wear-resistant member M configured as described above is formed as follows, so that the rake angle with respect to the excavation direction can be negative and the clearance angle can be positive. It has a blade portion 14. That is, one end surface of the wear resistant member M is formed flat. Thereby, the blade portion 14 of the cutter chip 10 includes a flat rake face (upper surface) 15. Further, the wear resistant member M is formed with a first inclined surface so as to form an obtuse angle with the one end surface. As a result, the blade portion 14 of the cutter tip 10 includes a flank 16 that forms an obtuse angle θ with the rake face 15. A cutting edge 17 is formed at the boundary between the rake face (upper surface) 15 and the flank face (first inclined surface) 16. In addition, as shown by the white arrow in FIG. 1, the direction orthogonal to the cutting edge 17 is the excavation direction of the excavation tool 10.
[0021]
Further, the wear-resistant member M is excavated at the corners on the opposite side of the first inclined surface (flank 16), whereby the cutter tip 10 is smoothly connected to the front surface 30a of the shank 30 on the front side. An inclined surface 18 is provided. In addition to this, on both sides of the wear-resistant member M, as shown in FIG. 2, the boundary between the one end surface and the first inclined surface, that is, the cutting edge 17 and the obtuse angle φ of the blade portion 14 are provided. A second inclined surface is formed as it is. As a result, the cutter chip 10 has side inclined surfaces 19 that form an obtuse angle φ with the cutting edge 17 on both sides thereof. Each side inclined surface 19 forms a positive side clearance angle γ with the workpiece O as shown in FIG. Further, the shank 30 is also formed with an inclined surface 30b that is smoothly and continuously connected to each inclined surface 19 of the cutter chip 10.
[0022]
When the excavation tool 1 configured as described above is used to perform excavation work with an underground excavator or the like, the direction orthogonal to the cutting edge 17 with respect to the workpiece O, that is, the white arrow in FIG. Work is performed while keeping the indicated excavation direction constant. At this time, since the excavation tool 1 is configured as described above, the rake angle α with respect to the excavation direction can be negative and the clearance angle β can be positive as shown in FIG. Thus, the breakage of the cutter chip 10 can be easily reduced by keeping the rake angle α negative during excavation work. Moreover, excavation resistance can be reduced by keeping the clearance angle β positive.
[0023]
Here, for example, when excavating concrete obstacle ground, etc., various obstacles such as steel bars such as H steel piles and PC piles and rubble are present irregularly on the object O to be cut such as ground. . Therefore, even if the excavation tool 1 is attached to an underground excavator such as a shield excavator or an earth auger all-casing method, and the excavation direction is kept constant, the cutter chip 10 has an obstacle from a random direction. It will collide. On the other hand, in the excavation tool 1, side inclined surfaces 19 that form an obtuse angle φ with the cutting edge 17 are formed on both sides of the cutter chip 10. Therefore, even if an obstacle collides with the cutter chip 10 from a direction different from the original excavation direction, the side clearance angle γ becomes positive, and each side inclined surface 19 functions as a clearance surface. As a result, it is possible to extremely effectively prevent the pipe material 12 and the internal hard material 11 from peeling off at the corner or the like, and the pipe materials 12 into which the hard material 11 is inserted. As described above, according to the excavation tool 1, even when the object to be cut O in which obstacles exist irregularly is excavated, it is possible to easily extend the life of the cutter tip 10.
[0024]
Even if a large impact is applied to the entire cutter tip 10 during excavation work, the force due to the impact acts in a distributed manner on each of the hard materials 11 inside each pipe 12. Therefore, the impact acting on the hard material 11 inside each tube material 12 is small, and even if a break (crack) or the like occurs in the hard material 11 inside each tube material 12, the possibility that the entire cutter chip 10 is broken is very small. Needless to say. Further, as the excavation work is repeated, the pipe material 12 of the cutter tip 10 wears, so that the cutter tip 10 also exhibits a so-called self-sharpening action.
[0025]
[Second Embodiment]
FIG. 3 is a schematic configuration diagram showing a second embodiment of the excavation tool according to the present invention. FIG. 4 is a front view of the excavation tool according to the second embodiment as seen from the IV direction in FIG. The excavating tool 1A shown in the figure is also suitable for use when excavating concrete obstacle ground, for example, and the cutter held by the shank 30A is the same as the excavating tool 1 according to the first embodiment described above. It has a chip 10. The cutter tip 10 has the same structure as that described for the excavation tool 1. That is, the cutter chip 10 is composed of a wear-resistant member M obtained by bundling and integrating a plurality of tube materials 12 in which hard materials 11 are inserted (see FIG. 4). The cutter chip 10 includes a flat rake face (upper surface) 15, a flank face (inclined face) 16 that forms an obtuse angle θ with the rake face 15, and a cutting edge 17 formed at the boundary between the rake face 15 and the flank face 16. It has the blade part 14 which consists of. Further, the cutter chip 10 is formed with a front inclined surface 18 that is smoothly continuous with the front surface of the shank 30A.
[0026]
On the other hand, in the excavation tool 1A according to the second embodiment, as shown in FIGS. 3 and 4, the blade portion 14 is protected so as to cover the upper half region on both sides of the shank 30A. A protective member 20 is provided. Whether the protective member 20 is made by fixing a flat plate made of a cemented carbide by brazing or the like, or overlaying a material containing hard particles such as a cemented carbide, a ceramic material, etc. in a planar shape by spraying or the like. And it is provided in both sides of excavation tool 1A. The edge of the protection member 20 is formed so as to be smoothly continuous with the rake face (upper face) 15, the flank face 16, and the front inclined face 18 of the cutter chip 10. Moreover, as shown in FIG. 4, the inclined surface 21 is formed in both the side edge parts of the protection member 20 so that the cutting edge 17 and an obtuse angle may be made. As shown in FIG. 4, each inclined surface 21 forms a positive side clearance angle γ with the workpiece O during work.
[0027]
Even when using the excavating tool 1A configured as described above, the work is performed while keeping the direction perpendicular to the cutting edge 17, that is, the excavating direction indicated by the white arrow in FIG. Do. At this time, since the excavation tool 1A has the blade portion 14 configured as described above, the rake angle α with respect to the excavation direction is negative and the clearance angle β is positive as shown in FIG. Can do. Thus, the breakage of the cutter chip 10 can be easily reduced by keeping the rake angle α negative during excavation work. Moreover, excavation resistance can be reduced by keeping the clearance angle β positive.
[0028]
Further, for example, when excavating concrete obstacle ground or the like, even if the excavation direction is kept constant, an obstacle collides with the cutter chip 10 from a random direction. The part is covered with a protective member 20 that protects the blade part 14. In addition, since the inclined surface 21 that forms an obtuse angle with the cutting edge 17 is formed on the side edge of the protective member 20, even if an obstacle collides with the cutter chip 10 from a direction different from the original excavation direction. The side clearance angle γ becomes positive, and each inclined surface 21 of the protection member 20 functions as a clearance surface. Therefore, at the corner or the like, it is very effectively prevented that the pipe material 12 and the internal hard material 11 are separated from each other and the pipe materials 12 into which the hard material 11 is inserted are separated. Therefore, according to the excavation tool 1A, even if the object to be cut O in which obstacles exist irregularly is excavated, it is possible to easily extend the life of the cutter tip 10.
[0029]
【The invention's effect】
Since the excavation tool and the wear-resistant member according to the present invention are configured as described above, the following effects are obtained. That is, in the present invention, the upper surface of the wear-resistant member obtained by bundling and integrating a plurality of pipe materials in which hard materials are inserted is flattened, the first inclined surface is formed so as to form an obtuse angle with the upper surface, A second inclined surface is formed so as to form an obtuse angle with the boundary with the first inclined surface. As a result, the cutting edge of the cutter tip is formed so that the rake angle with respect to the excavation direction is negative and the clearance angle is positive, and the side of the cutter tip is inclined to form an obtuse angle with the cutting edge. A surface is provided.
[0030]
Further, in the present invention, the upper surface of the wear-resistant member obtained by bundling and integrating a plurality of pipe materials in which a hard material is inserted is flattened, and an inclined surface is formed so as to form an obtuse angle with the upper surface. A protective member is provided on the side. Thereby, the blade portion of the excavation tool is formed so that the rake angle with respect to the excavation direction can be negative and the clearance angle can be positive, and the blade portion is provided on at least one side portion of the cutter tip. A protective member for protecting the surface is provided.
[0031]
As a result, it is possible to realize an excavation tool that can easily extend the life of the cutter tip and a wear-resistant member that can easily extend the life.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a first embodiment of an excavation tool according to the present invention.
2 is a front view of the excavation tool shown in FIG. 1 as viewed from the II direction in FIG. 1;
FIG. 3 is a schematic configuration diagram showing a second embodiment of the excavation tool according to the present invention.
4 is a front view of the excavation tool shown in FIG. 3 as viewed from the direction IV in FIG. 3;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,1A ... Excavation tool, 10 ... Cutter tip, 11 ... Hard material, 12 ... Pipe material, 13 ... Brazing material, 14 ... Blade part, 15 ... Rake face, 16 ... Flank, 17 ... Cutting edge, 18 ... Front side inclination , 19 ... side inclined surface, 20 ... protective member, 21 ... inclined surface, 30, 30A ... shank, M ... wear-resistant member, O ... object to be cut, α ... rake angle, β ... clearance angle, γ ... Side clearance angle.

Claims (4)

In an excavation tool having a cutter tip made of a wear-resistant member obtained by bundling and integrating a plurality of pipe materials into which hard materials are inserted,
The cutter tip has a blade portion formed so that a rake angle with respect to the excavation direction is negative and a clearance angle is positive, and at least one side portion of the cutter tip. Is formed with a side inclined surface that forms an obtuse angle with the cutting edge provided on the blade portion, and the front surface facing the excavation direction is smooth with the front surface of the shank while being inclined with respect to the rake surface forming the rake angle . The hard material is exposed at the blade portion, the side inclined surface, and the front surface facing the excavation direction, and the outer peripheral surface of the pipe material housed in the shank is held by the shank. Excavation tool characterized by that. In the wear-resistant member that forms a cutter chip by bundling and integrating a plurality of pipe materials in which hard materials are inserted,
It is formed on at least any one side so as to form an obtuse angle with a flat rake face, a flank surface formed so as to make an obtuse angle with the rake face, and the rake face and the flank face. had a side inclined surface, the rake face, the cutter tip the flank with the previous SL being inclined at different angles in a manner to reduce the obtuse angle between the front of the shank facing the drilling direction of the front and front inclined surface smoothly consecutive sheets Yanku is interposed, said rake face, the flank, to expose the hard material on the side inclined surface and the front inclined surface, it is furnished with the pipe material on the shank An abrasion-resistant member characterized in that the outer peripheral surface of the tube material is held by the shank. In an excavation tool having a cutter tip made of a wear-resistant member obtained by bundling and integrating a plurality of pipe materials into which hard materials are inserted,
The cutter tip has a blade portion formed so that the rake angle with respect to the excavation direction is negative and the clearance angle is positive, and the hard material is exposed to the blade portion. In addition, an outer peripheral surface of the pipe material housed in the shank is held by the shank, and at least one side portion of the cutter tip is inclined so as to form an obtuse angle continuously to the cutting edge provided in the blade portion. An excavation tool comprising a protective member for protecting the blade portion while having a surface. In the wear-resistant member that forms a cutter chip by bundling and integrating a plurality of pipe materials in which hard materials are inserted,
A flat rake face, and a flank face formed so as to form an obtuse angle with the rake face, the hard material is exposed on the rake face and the flank face, and the pipe material is embedded in the shank. While the outer peripheral surface of the tube material is held by the shank, at least one of the side portions has an inclined surface that forms an obtuse angle continuously to a cutting edge formed by the rake surface and the flank surface. A wear-resistant member comprising a protective member that covers the portion.

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