JP2002061483A - Excavating tool and wear-resistant member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an excavating tool capable of easily lengthening the life of a cutter tip and a wear-resistant member of which the life is easily lengthened. SOLUTION: The excavating tool 1 comprises the cutter tip 10 comprised of a wear-resistant member M obtained by integrally bundling a plurality of tube materials 12 in which hard materials 11 are inserted. The cutter tip 10 comprises a blade part 14 comprised of a cutting face 15, a flank which forms an obtuse angle with the cutting face 15, and a cutting edge 17. The cutting part 14 is formed so that the cutting angle a to the direction of excavation can be negative and that the flank angle β can be positive when excavating an object to be cut (O). Then the side part of the cutter tip 10 is provided with a side inclined face 19 which forms an obtuse angle θ with the cutting edge 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a drilling tool, and
More particularly, the present invention relates to a drilling tool including a cutter tip using a hard material such as a cemented carbide, and a wear-resistant member applicable to various uses including a cutter tip.

[0002]

2. Description of the Related Art Conventionally, techniques in such a field include:
One disclosed by Japanese Patent No. 2901202 is known. This gazette describes a wear-resistant member in which a plurality of pipes in which a hard material is inserted are bundled and integrated. When manufacturing this wear-resistant member, a rod-shaped hard material made of a cemented carbide or the like is inserted into a tube made of a metal or the like. In addition, a plurality of such pipes in which the hard material is inserted are bundled. Then, a brazing material is placed on the upper portion of the opening of the pipe assembly, and a brazing atmosphere is formed around the pipe assembly in a continuous hydrogen furnace or the like. Thereby, the hard material and the inner peripheral surface of the tube material are brazed to each other adjacent to each other at the contact portion between the tube materials inside the respective tube materials.

[0003]

In the wear-resistant member as described above, when a large impact is applied to the entire member, the force due to the impact is dispersed and acts on each of the hard materials inside each tube. Therefore, the impact acting on the hard material inside each tube is small, and even if the hard material inside each tube is broken (cracked), the possibility that the entire wear-resistant member is broken is extremely small. . However, when the wear-resistant member configured as described above is applied as, for example, a cutter tip of an excavation tool for excavating a concrete obstacle ground or the like, the following problem occurs.

That is, when excavating a concrete obstacle ground or the like, obstacles such as steel frames and steel bars such as H steel piles and PC piles are irregularly present in the ground. Therefore,
Even if the digging direction of the digging tool (cutter tip) is kept constant, an obstacle will collide with the cutter tip from a random direction. And when the obstacle collides with the cutter tip from a random direction like this,
At the corner of the cutter tip, the tube material and the hard material inside the tube material, and the tube materials into which the hard material was inserted sometimes peeled off. In this respect, the conventional wear-resistant member, that is, the cutter tip of the drilling tool has a problem in terms of durability.

Accordingly, an object of the present invention is to provide a drilling tool that can easily extend the life of a cutter tip and a wear-resistant member that can easily extend the life of a cutter tip.

[0006]

According to a first aspect of the present invention, there is provided a drilling tool having a cutter tip made of a wear-resistant member in which a plurality of pipes each having a hard material inserted therein are bundled and integrated. In the cutter tip, the rake angle with respect to the excavation direction is negative, and has a blade portion formed so that the clearance angle can be positive, and at least one side of the cutter tip Is characterized in that an inclined surface that forms an obtuse angle with the cutting edge provided in the blade portion is formed.

[0007] This excavating tool is suitable for use in excavating concrete obstacle ground, for example, and has a cutter tip made of a wear-resistant member. The wear-resistant member is obtained by bundling and integrating a plurality of pipes in which a hard material is inserted. In this case, the upper surface (the rake face of the blade portion) of the wear-resistant member is formed, for example, flat. 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 portion of the cutter tip becomes flat. In addition, a cutting edge of the blade portion is provided at a boundary between the rake face (upper surface) and the flank (first inclined surface), and a direction substantially orthogonal to the cutting edge is a digging direction of the digging tool. Further, a side surface of the wear-resistant member has a boundary between an upper surface (rake surface) and a first inclined surface (flank surface), that is, a second inclined surface formed at an obtuse angle with the cutting edge of the blade portion. Is formed. As a result, the excavating tool has an inclined surface at an obtuse angle with the cutting edge on at least one side.

[0008] The excavating tool thus configured has a blade portion capable of making the rake angle with respect to the excavation direction negative and making the clearance angle positive. Then, while maintaining the direction perpendicular to the cutting edge constant as the digging direction, the rake angle is kept negative during the digging operation, whereby the breakage of the cutter tip can be easily reduced. . Also, by keeping the clearance angle positive, excavation resistance can be reduced.

Here, for example, when excavating a concrete obstacle ground or the like, since various obstacles are irregularly present in the ground, even if the excavation direction is kept constant, the cutter is not cut. An obstacle will hit the chip from a random direction. On the other hand, in this excavating tool, an inclined surface that forms an obtuse angle with the cutting edge of the blade is formed on at least one side of the cutter tip. Therefore, even if an obstacle collides with the blade portion from a direction different from the original excavation direction, the inclined surface will function as a flank surface. In addition, it is possible to extremely effectively prevent the tube materials in which the hard material is inserted from peeling off from each other. Therefore,
According to this excavating tool, it is possible to easily extend the life of the cutter tip even when excavating an object to be cut in which an obstacle is irregularly present.

[0010] A wear-resistant member according to the present invention according to claim 2 is a wear-resistant member obtained by bundling and integrating a plurality of pipes into which a hard material is inserted. A first inclined surface formed so as to form an upper surface and a first inclined surface;
And a second inclined surface formed so as to form an obtuse angle with the boundary with the inclined surface.

According to a third aspect of the present invention, there is provided an excavating tool having a cutter tip comprising a wear-resistant member obtained by bundling and integrating a plurality of pipes into which a hard material is inserted. To make the rake angle with respect to the excavation direction negative, and to have a blade angle formed so that the clearance angle can be positive, at least one side of the cutter tip, to protect the blade part Is provided.

This excavating tool is also suitable for use in excavating a concrete obstacle ground, for example, and has a cutter tip made of a wear-resistant member. The wear-resistant member is obtained by bundling and integrating a plurality of pipes in which a hard material is inserted. In this case, the upper surface (the rake face of the blade portion) of the wear-resistant member is formed, for example, flat. Also, an 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 portion 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, and the direction orthogonal to the cutting edge is the digging direction of the digging tool. Further, at least one of the wear-resistant members, that is, at least one of the side portions of the cutter tip, is provided with a protection member for protecting the blade portion.

[0013] The excavating tool thus configured also has a blade portion that can make the rake angle with respect to the excavation direction negative and the relief angle positive. Then, while maintaining the direction perpendicular to the cutting edge constant as the digging direction, the rake angle is kept negative during the digging operation, whereby the breakage of the cutter tip can be easily reduced. . Also, by keeping the clearance angle positive, excavation resistance can be reduced.

Further, for example, when excavating a concrete obstacle ground or the like, even if the excavation direction is kept constant, an obstacle will collide with the cutter chip from a random direction. The side part is covered by a protection member that protects the blade part. Therefore, in a corner or the like, it is extremely effectively prevented that the tube material and the internal hard material are separated from each other, and that the tube materials in which the hard material is inserted are separated from each other. Therefore, even with this excavating tool, it is possible to easily extend the life of the cutter tip even when excavating an object to be cut in which an obstacle is irregularly present.

According to a fourth aspect of the present invention, there is provided a wear-resistant member according to the present invention, wherein a plurality of pipes in which a hard material is inserted are bundled and integrated to form a flat upper surface and an obtuse angle with the upper surface. It is characterized by having an inclined surface formed so as to form and a protective member covering at least one side.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a drilling tool and a wear-resistant member according to the present invention will be described below in detail with reference to the drawings.

[First Embodiment] FIG. 1 is a schematic structural view showing a first embodiment of a drilling tool according to the present invention. Also,
FIG. 2 shows an excavating tool according to the first embodiment in FIG.
It is the front view seen from the II direction. The drilling tool 1 shown in these figures is suitable for use when, for example, digging a concrete obstacle ground or the like, and has a cutter tip 10 held by a shank 30. Cutter tip 10
Consists of a wear-resistant member M obtained by bundling and integrating a plurality of tube members 12 into which a hard member 11 is inserted (see FIG. 2). In this case, as the hard material 11, for example, a material obtained by forming a cemented carbide, cermet, ceramic, or the like into a rod shape is used.
Further, as the tube material 12, for example, 50% Fe-50%
A member made of a metal such as Ni and having a cross-sectional shape such as a circle, a rectangle, or a polygon is used.

In manufacturing the wear-resistant member M constituting the cutter tip 10, first, a hard material 11 is inserted into a plurality of pipes 12, and the pipe 1 in which the hard material 11 is inserted is inserted.
2. Bundle a plurality of 2. Then, a brazing material 13 such as silver braze is placed on the upper portion of the opening of such an assembly of the pipe members 12, and a brazing atmosphere is formed around the assembly of the tube members 12 in a continuous hydrogen furnace or the like. Thereby, inside each pipe material 12,
The hard material 11 and the inner peripheral surface of the pipe 12 are brazed to each other at the contact portion between the pipes 12, and the hard materials 11 and the pipes 12 are easily integrated. You.

The thus constructed wear-resistant member M
In this case, a hard material 11 obtained by molding a cemented carbide, cermet, ceramic, or the like into a small-diameter rod is used. In the brazing operation, the outer periphery of each hard material 11 is
Will be covered by As a result, in various members using the wear-resistant member M, even if a break (crack) occurs in a part of the hard material 11, the break remains in the block and does not lead to the entire break. The life can be easily extended.

The cutter tip 10 is formed by molding the wear-resistant member M having the above-described structure as described below so that the rake angle with respect to the excavation direction can be made negative and the clearance angle can be made positive. The blade portion 14 is formed at
That is, one end surface of the wear-resistant member M is formed flat. Thus, the blade portion 14 of the cutter tip 10 includes a flat rake face (upper face) 15. Further, a first inclined surface is formed on the wear-resistant member M so as to form an obtuse angle with one end surface. Thereby, the cutter tip 1
The 0 blade portion 14 includes a flank 16 which forms an obtuse angle θ with the rake face 15. And the rake face (top)
Cutting edge 1 at the boundary between flank 15 and flank (first inclined surface) 16
7 is formed. 1, the direction perpendicular to the cutting edge 17 is the digging direction of the digging tool 10.

Further, the wear-resistant member M has a corner portion dug obliquely on the side opposite to the first inclined surface (flank surface 16), whereby the cutter tip 10 is smoothed with the front surface 30a of the shank 30. It will have a continuous front slope 18. In addition, on both sides of the wear-resistant member M, as shown in FIG. 2, the boundary between one end surface and the first inclined surface, that is, the cutting edge 17 of the blade portion 14 and the obtuse angle φ are formed. A second inclined surface is formed as shown. As a result, the cutter tip 10 has side inclined surfaces 19 that form an obtuse angle φ with the cutting edge 17 on both sides thereof. Each side slope 1
9 forms a positive side clearance angle γ with the workpiece O as shown in FIG. Also, the shank 30 has a slope 3 smoothly connected to each side slope 19 of the cutter tip 10.
0b is formed.

When the underground excavator or the like performs an excavating operation using the excavating tool 1 configured as described above, a direction orthogonal to the cutting edge 17, that is, a white The work is performed while keeping the direction of excavation indicated by the pullout arrow 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 made negative and the clearance angle β can be made positive as shown in FIG. In this way, by keeping the rake angle α negative during excavation work, breakage of the cutter tip 10 can be easily reduced. In addition, by keeping the clearance angle β positive, the excavation resistance can be reduced.

Here, for example, when excavating a concrete obstacle ground or the like, various obstacles such as a steel bar such as an H steel pile or a PC pile and rubble stones are irregularly present in an object O to be machined such as the ground. are doing. 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, obstacles are generated in the cutter tip 10 from random directions. You will collide. On the other hand, in the case of the drilling tool 1, the cutting edge 1 is provided on both sides of the cutter tip 10.
A side inclined surface 19 that forms an obtuse angle φ with 7 is formed. Therefore, even if an obstacle collides with the cutter tip 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 flank. This makes it possible to extremely effectively prevent the tube material 12 and the inner hard material 11 from peeling off each other and the tube materials 12 having the hard material 11 interposed therebetween at the corners or the like. Thus, according to the excavating tool 1, even if the object to be machined O in which an obstacle is present irregularly is excavated,
It is possible to easily extend the life of the cutter tip 10.

Note that even if a large impact is applied to the entire cutter tip 10 during the excavation work, the force due to the impact is
It acts on each of the hard members 11 inside each pipe member 12 in a dispersed manner. Therefore, the impact acting on the hard material 11 inside each pipe 12 is small, and even if the hard material 11 inside each pipe 12 is broken (cracked) or the like, the possibility that the entire cutter tip 10 is broken is extremely small. Needless to say. Further, as the excavating operation is repeated, the pipe material 12 of the cutter tip 10 wears, so that the cutter tip 10
Also exerts a so-called self-sharpening effect.

[Second Embodiment] FIG. 3 is a schematic structural view showing a second embodiment of a drilling tool according to the present invention. Also,
FIG. 4 shows an excavating tool according to the second embodiment in FIG.
It is the front view seen from the IV direction. Drilling tool 1A shown in FIG.
For example, it is suitable to be used when excavating a concrete obstacle ground or the like, and has a cutter tip 10 held by a shank 30A, like the excavating tool 1 according to the first embodiment described above. The cutter tip 10 has the same structure as that described for the excavating tool 1. That is, the cutter tip 10 is made of a wear-resistant member M in which a plurality of tube members 12 in which hard members 11 are inserted are bundled and integrated (see FIG. 4). The cutter tip 10 includes a flat rake face (upper face) 15, a flank (sloped face) 16 forming an obtuse angle θ with the rake face 15, and a cutting edge 17 formed at a boundary between the rake face 15 and the flank 16. And a blade portion 14 comprising: Further, the cutter tip 10 is formed with a front inclined surface 18 that is smoothly continuous with the front surface of the shank 30A.

On the other hand, in the excavating tool 1A according to the second embodiment, as shown in FIG. 3 and FIG.
Is provided. The protection member 20 is formed by fixing a flat plate made of a cemented carbide or the like by brazing or the like, or hard particles of a cemented carbide or the like,
A material containing a ceramic material or the like is provided on both sides of the excavating tool 1A by building up a flat material by thermal spraying or the like. The edges of the protection member 20 include a rake surface (upper surface) 15, a flank 16, and a front inclined surface 18 of the cutter tip 10.
It is formed so as to continue smoothly. Also, the protective member 2
0, as shown in FIG.
Is formed at an obtuse angle. During the operation, each inclined surface 21 forms a positive side clearance angle γ with the object O to be machined as shown in FIG.

When using the excavating tool 1A thus constructed, the direction perpendicular to the cutting edge 17, that is, the excavating direction indicated by the white arrow in FIG. Work while doing. At this time, the drilling tool 1A
Has the blade portion 14 configured as described above, so that the rake angle α with respect to the excavation direction can be made negative and the clearance angle β can be made positive as shown in FIG. In this way, by keeping the rake angle α negative during excavation work, breakage of the cutter tip 10 can be easily reduced. In addition, by keeping the clearance angle β positive, the excavation resistance can be reduced.

Further, for example, when excavating a concrete obstacle ground or the like, even if the direction of excavation is kept constant, an obstacle will collide with the cutter chip 10 from a random direction. The side of 10
The blade 14 is covered by a protection member 20 that protects the blade. In addition, since the inclined surface 21 that forms an obtuse angle with the cutting edge 17 is formed at the side edge of the protective member 20, even if an obstacle collides against the cutter tip 10 from a direction different from the original excavation direction. , The side clearance angle γ becomes positive, and the protection member 20
The respective inclined surfaces 21 function as flank surfaces. Therefore, at a corner or the like, the pipe material 12 and the internal hard material 11
Also, peeling of the tube members 12 with the hard members 11 interposed therebetween is extremely effectively prevented. Therefore, according to the excavating tool 1 </ b> A, it is possible to easily extend the life of the cutter tip 10 even when excavating the workpiece O in which an obstacle is irregularly present.

[0029]

Since the excavating 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 tube materials into which the hard material is inserted is flattened, and the first inclined surface is formed so as to form an obtuse angle with the upper surface. The second inclined surface is formed so as to form an obtuse angle with the boundary with the first inclined surface. Thereby, the blade portion of the cutter tip is formed so that the rake angle with respect to the excavation direction can be made negative and the clearance angle can be made positive, and the side portion of the cutter tip has an oblique angle with the cutting edge. A surface is provided.

Further, in the present invention, the upper surface of the wear-resistant member obtained by bundling and integrating a plurality of tube materials into 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 protection member is provided on one side. Thereby, the blade portion of the drilling tool is formed so that the rake angle with respect to the digging direction can be negative and the clearance angle can be positive, and at least one side of the cutter tip has a blade portion. Is provided.

As a result, it becomes possible to realize a drilling tool that can easily extend the life of the cutter tip and a wear-resistant member that can easily extend the life of the cutter tip.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a first embodiment of a drilling tool according to the present invention.

FIG. 2 is a front view of the excavating tool shown in FIG. 1 as viewed from a direction II in FIG.

FIG. 3 is a schematic configuration diagram showing a second embodiment of a drilling tool according to the present invention.

FIG. 4 is a front view of the excavating tool shown in FIG. 3 as viewed from a direction IV in FIG. 3;

[Explanation of symbols]

1, 1A: excavating tool, 10: cutter tip, 11: hard material, 12: pipe material, 13: brazing material, 14: blade portion, 15: rake face, 16: flank face, 17: cutting edge, 18: front inclination Surface, 19: side inclined surface, 20: protective member, 21: inclined surface, 30, 30A: shank, M: wear-resistant member, O:
Machining target, α: rake angle, β: clearance angle, γ: side clearance angle.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Yamada 1-1-1, Wadasaki-cho, Hyogo-ku, Kobe-shi, Hyogo Inside the Kobe Shipyard of Mitsubishi Heavy Industries, Ltd. (72) Inventor Hisao Arai, Shibaura 1-chome, Minato-ku, Tokyo No. 2-3 Shimizu Corporation (72) Inventor Katsuhiro Ito 580 Horikawa-cho, Saiwai-ku, Kawasaki-shi, Kanagawa F-term (reference) 2D029 FA01 FB01 FC03 FC04 FD03

Claims (4)

[Claims] 1. A drilling tool having a cutter tip made of a wear-resistant member obtained by bundling and integrating a plurality of pipes into which a hard material is inserted, wherein the cutter tip has a negative rake angle with respect to a drilling direction, and A cutter portion formed so that the clearance angle can be made positive, and at least one side of the cutter tip forms an obtuse angle with the cutting edge provided on the blade portion. An excavating tool having an inclined surface. 2. A wear-resistant member obtained by bundling and integrating a plurality of pipes into which a hard material is inserted, comprising: a flat upper surface; a first inclined surface formed so as to form an obtuse angle with the upper surface; A wear-resistant member having a second inclined surface formed so as to form an obtuse angle with a boundary between the upper surface and the first inclined surface. 3. A drilling tool having a cutter tip made of a wear-resistant member obtained by bundling and integrating a plurality of pipes into which a hard material is inserted, wherein the cutter tip has a negative rake angle with respect to a drilling direction, and A cutter member formed so that the clearance angle can be made positive, and a protection member for protecting the blade portion is provided on at least one side of the cutter tip. A drilling tool, characterized in that: 4. A wear-resistant member obtained by bundling and integrating a plurality of pipes into which a hard material is inserted, wherein at least one of a flat upper surface and an inclined surface formed so as to form an obtuse angle with the upper surface. A protection member for covering one side portion.