JP2000352292A - Crushing tool and cemented carbide material tip for crushing tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably hold a cemented carbide material tip by casting metal so as not to separate, slip out and rotate while preventing the formation of a cavity part and a defect part in a crushing tool manufactured by an insertingly casting method for holding a cemented carbide material by casting the casting metal in a state of having the cemented carbide material on the tip. SOLUTION: A teeth bit 1 is formed by casting casting metal 5 (for example, casting steel) being base metal in a state of having on the tip a cemented carbide material tip 4 excellent in abrasion resistance, and a projecting part 6 is arranged on a contact surface with the casting metal 5 of the cemented carbide material tip 4. A recessed part is also arranged in the cemented carbide material tip 4, or only the recessed part may be arranged without arranging the projecting part 6. A hard layer is formed on an outside surface of the casting metal except for the cemented carbide material tip 4 when necessary.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crushing tool such as a digging tool for digging earth and sand and a bedrock, and a crushing tool for crushing rocks, boulders and gravel. And a cemented carbide chip for the crushing tool.

[0002]

2. Description of the Related Art Drilling tools for excavating earth and sand, rock mass, rock mass,
As a prior art relating to the configuration of a bit portion suitable for a crushing tool for crushing boulders and gravel, there is one described in Japanese Patent Application Laid-Open No. 6-218520. Here, after the cemented carbide chip is fixed at a predetermined position in the mold (the point to be the tip of the drilling tool), a casting metal serving as a base metal is poured into the mold, and the casting metal and the cemented carbide chip are poured. There is disclosed a technique in which a diffusion adhesive layer is formed therebetween to hold a cemented carbide chip.
This technique is sometimes called as insert.

According to this prior art, compared to a method of attaching a cemented carbide chip to a base metal by brazing or press fitting,
It is possible to prevent the chip from peeling off, coming off or turning around. The above-mentioned prior art also discloses that an anchor hole is provided in advance in a cemented carbide tip to enhance the holding force of the tip by a casting metal.

[0004]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 6-218.
In the related art described in Japanese Patent Publication No. 520, it is assumed that the molten metal flows into the anchor hole provided in the cemented carbide chip in the casting process to increase the holding force. In some cases, the molten metal is difficult to flow in, and a cavity may be formed in the inner part of the anchor hole. If the flow of the molten metal is incomplete as described above, gas accumulates in that portion, forming a cavity or a defective portion, which may cause breakage when stress is applied from the outside.

SUMMARY OF THE INVENTION It is an object of the present invention to prevent the formation of a cavity or a defect in a cast-in system in which a casting metal is cast in a state in which a cemented carbide material is provided at its tip and the cemented carbide material is held. It is an object of the present invention to provide a crushing tool capable of securely holding a cemented carbide material to a casting metal so as not to peel, come off, or rotate, and to provide a cemented carbide chip for the crushing tool.

[0006]

According to the present invention, there is provided, in accordance with the present invention, a casting metal having a wear-resistant cemented carbide material provided at a tip end thereof, and a casting metal being cast with the cemented carbide material. A crushing tool manufactured by forming a diffusion adhesive layer between the metal and the metal for casting, wherein a projection is provided on a contact surface of the cemented carbide with the metal for casting. .

In the present invention configured as described above,
At the time of casting, the convex part provided on the contact surface of the cemented carbide with the casting metal will be wrapped with the molten metal of the casting metal, and the cemented carbide will peel off or fall out due to the action force generated during crushing work Spinning is avoided. In addition, since anchor holes are not provided in the cemented carbide material and the molten metal is not poured into the holes, no voids or defects are formed due to imperfect molten metal flow, and the cemented carbide material is reliably used for casting metal. Is held.

Further, in the present invention, in addition to the above-mentioned convex portion, a concave portion may be further provided on a contact surface of the cemented carbide with the casting metal. In this case, at the time of casting, the molten metal of the casting metal flows into the concave portion, and it is possible to prevent the cemented carbide from peeling, coming off, or turning around due to the acting force generated during the crushing operation. Further, since the concave portion has a completely different shape from the above-described anchor hole and does not penetrate the cemented carbide material, there is no possibility that the molten metal is unlikely to flow unlike the anchor hole. Therefore, a cavity or a defect is not formed due to incomplete flow of the molten metal, and the cemented carbide is reliably held by the casting metal.

Further, only the above-mentioned concave portion may be provided on the contact surface of the cemented carbide with the casting metal.

[0010] In the above-mentioned crushing tool, preferably, superhard powder previously mixed with a welding agent is applied to the inner surface of the casting mold except for the position where the superhard material is installed, and then casting with a casting metal is performed. Thereby, a hard layer is formed on the outer surface of the casting metal excluding the cemented carbide.

As described above, if a hard layer is formed on the outer surface of the casting metal excluding the cemented carbide and the surface is modified, defects may occur in the casting metal near the cemented carbide during the crushing operation. The casting metal is not worn away and becomes thin.

Further, according to the present invention, it has abrasion resistance,
In the cemented carbide tip for a crushing tool cast by the casting metal at the tip of the crushing tool while forming a diffusion adhesive layer between the casting metal and the tip of the crushing tool, having a convex portion on the contact surface with the casting metal. There is provided a cemented carbide tip for a crushing tool.

Further, in addition to the above-mentioned convex portion, a concave portion may be further provided on a contact surface of the cemented carbide with the casting metal. Or,
Only the concave portion may be provided on the contact surface of the cemented carbide with the casting metal.

[0014] The crushing tool in the present invention includes earth and sand,
The concept includes both digging tools for digging rock and crushing tools for crushing rocks, boulders and gravel.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a view showing an example of equipment to which the crushing tool of the present invention is attached, and is a view showing a tunnel excavator. 1A is a longitudinal sectional view of the tunnel machine, and FIG. 1B is a front view of the tunnel machine.

In this tunnel machine 301, a partition wall 3 of the shield body 302 is provided in front of the shield body 302.
A dome-shaped cutter head 305 that forms a cutter chamber 304 between the rotary shaft and the rotary shaft 03 is rotatably supported via a slewing bearing 306. It is rotationally driven by a cutter drive motor 309 installed behind the partition wall 303 via the meshing pinion 308. Further, a screw conveyor 325 for discharging excavated earth and sand from the cutter chamber 304 into the rear shield machine is attached to the tunnel machine 301.

A plurality of roller bit mounting grooves 310 are provided in the face plate 305a of the cutter head 305, and slits 311 for taking in earth and sand are provided between these groove parts 310.
Is provided. The groove 310 has a roller bit 3 as a crushing tool for crushing rocks, boulders, and gravel on the front of the tunnel.
22 are mounted, and an extra excavation device 312 is also mounted. In addition, a number of tooth bits 323 as excavating tools for excavating earth and sand and rock according to the shape of the tunnel are mounted around the slit 311 of the face plate 305a. The imaginary line 324 shown in FIG.
And cutter head 305 with teeth bit 323
Indicates the normal excavation surface. This embodiment relates to some examples of the tooth bit 323 in the crushing tool shown in FIG.

FIG. 2 is a view showing a tooth bit.
(A) is a side view, (b) is a view of (a) viewed from the B direction, and (c) is a view of (a) viewed from the C direction. FIG.
In (a), the plate-shaped teeth bit 1 is attached to the mounting portion 2.
The teeth bit 1 is attached to the tunnel machine 301 by using the attachment pin holes 3 of the attachment portion 2. The teeth bit 1 is formed by casting a casting metal 5 (for example, cast steel) serving as a base metal, with a tip having a super hard material tip 4 having excellent wear resistance. The tip of the cemented carbide tip 4 is shown exposed in the figure, but strictly speaking, the cemented carbide tip 4
The casting metal 5 is very thinly covered at the tip, and the tip of the cemented carbide tip 4 is exposed during excavation work. Such a tooth bit 1 is produced by a cast-in method in which a cemented carbide chip 4 is fixed at a predetermined position (a tip end of the tooth bit 1) in a mold, and then a molten metal of a casting metal 5 is poured into the mold. You. In addition, casting metal 5 and cemented carbide tip 4
A diffusion bonding layer is formed by the above-described casting process, whereby the cemented carbide chip 4 is held by the casting metal 5.

On the contact surface of the cemented carbide chip 4 with the casting metal 5, a projection 6 is provided. The protruding portion 6 is wrapped with the molten metal of the casting metal 5 at the time of casting, thereby preventing the cemented carbide chip 4 from peeling or falling off. In addition, since an anchor hole is not provided in the cemented carbide tip 4 and the molten metal is not poured into the hole at the time of casting, a cavity or a defective portion due to incomplete molten metal flow is not formed. The cemented carbide tip 4 is held by the casting metal 5.

FIG. 3 is a diagram showing a modification of the teeth bit shown in FIG. In the example of FIG. 3, two types of cemented carbide tips 14 </ b> A and 14 </ b> B are attached so as to be exposed on the surface of the tip portion of the teeth bit 11. The method for casting the cemented carbide chips 14A, 14B and the casting metal 15 is shown in FIG.
Is the same as Also, the cemented carbide chips 14A, 14A
Each of B has a convex portion 16A, 16B and a concave portion 17A, 1
7B is provided. The function of the convex portions 16A and 16B is the same as that of FIG.
A and 16B perform almost the same function. In particular, the recess 17
A and 17B have completely different shapes from the above-mentioned anchor holes,
Since the molten metal does not penetrate through the cemented carbide chips 14A and 14B, the molten metal of the casting metal 15 easily flows during casting, and a cavity or a defective portion due to incomplete molten metal is not formed.

Further, in the teeth bit 11 of FIG. 3, the casting metal 1 excluding the cemented carbide chips 14A and 14B is used.
The hard layer 18 is formed on a part of the outer surface of No. 5. The hard layer 18 is formed by applying a super hard powder mixed with a welding agent to the inner surface of the mold before casting, and then performing the above-mentioned casting, that is, casting. Also, the superhard powder mixed with the welding agent is applied to a predetermined location on the inner surface of the mold other than the installation location of the superhard chips 14A and 14B. If the surface of the casting metal 15 is modified by forming such a hard layer 18, defects occur near the cemented carbide chips 14 </ b> A and 14 </ b> B during crushing (digging) work, or the casting metal 15 is rubbed. There will be no loss of meat.

FIG. 4 is a diagram showing another modification of the teeth bit shown in FIG. The structure of the tooth bit 21 of FIG. 4 is basically the same as that of the tooth bit 1 of FIG. 1, except that both the convex portion 26 and the concave portion 27 are provided on the contact surface of the cemented carbide tip 24 with the casting metal 25. It differs in that it is provided. Further, a hard layer 28 is formed on a part of the outer surface of the casting metal 25 except for the cemented carbide chip 24 as in FIG.

In particular, when both the convex portion 26 and the concave portion 27 are provided on the cemented carbide tip 24 as in the case of the teeth bit 21, the surface on which the earth and sand or the rock is cut off, that is, the surface which is liable to be worn by the action force of excavation. It is desirable to locate the recess on the side of. This is because, if a convex portion is located on the surface on the side from which earth and sand or rock is scraped, the thickness of the casting metal on that side is reduced, and the holding power of the cemented carbide chip is reduced.

FIG. 5 is a view showing still another modification of the teeth bit shown in FIG. 2, (a) is a side view thereof,
(B) is a view of (a) viewed from the B direction, and (c) is a view of (a) viewed from the C direction. In this example, as shown in FIGS. 5A and 5B, a cemented carbide tip 34B similar to the cemented carbide tip 4 of FIG. 34A is cast into the casting metal 35. Further, the cemented carbide tip 34 is provided with a convex portion 36 and a concave portion 37 similar to those provided in the cemented carbide tip 14A of FIG. 3, and furthermore, the cemented carbide tip 34A as in FIG. The hard layer 38 is formed on a part of the outer surface of the casting metal 35 except for the above.

FIG. 6 is a view showing still another modification of the teeth bit shown in FIG. 2, (a) is a side view thereof,
(B) is the figure which looked at (a) from the B direction. The tooth bit 41 of FIG. 6 has the same shape as the cemented carbide tip 14B of FIG. 3, and a cemented carbide tip 44 having a convex portion 46 and a recessed portion 47 is attached to the tip portion. A cylindrical superhard tip 49 is cast on the surface to which the 44 is not attached. The cemented carbide tip 49 has a function as a crushing tool for crushing rock blocks, boulders, and gravel. A groove-shaped recess 49 is formed in the cylindrical cemented carbide tip 49.
The casting metal 45 flows into the recess 49a during casting to prevent the cemented carbide chip 49 from slipping out and turning. The cemented carbide tip 44 is the same as the cylindrical cemented carbide tip of the second embodiment, and details thereof will be described later.

FIGS. 7 to 11 show examples of plate-shaped cemented carbide chips cast into the teeth bit described with reference to FIGS. However, (a) in each of FIGS. 7 to 11 is a side view of the cemented carbide chip, and (b) is a cross-sectional view or an arrow view from each BB direction. The cemented carbide chip 100 shown in FIG. 7 is provided with convex portions 101 and 102 on both surface sides, the convex portion 101 on the front side has only a curved surface, and the convex portion 102 on the back surface has a partly flat surface. This cemented carbide chip 100
Is similar to the cemented carbide tip 4 of FIG. The cemented carbide chip 110 shown in FIG.
2 are provided, and the cemented carbide tip 110 is similar to the cemented carbide tip 24 of FIG. The cemented carbide chip 120 shown in FIG. 9 has concave portions 121 and concave portions 122 on both sides.

Carbide chip 1 shown in FIGS. 10 and 11
Protrusions 131 and 141 and recesses 132 and 142 are provided on the respective 30 and 140. The cemented carbide tip 130 in FIG. 10 is the cemented carbide tip 14A in FIG. 3 and the cemented carbide tip 140 in FIG. Are similar to the cemented carbide tips 14B in FIG. 3, respectively.

According to the present embodiment as described above, the cemented carbide chips 4, 14A, 14B, 24, 34A, 44, 49
Are provided with convex portions 6, 16A, 16B, 26, 36, 46 or concave portions 17A, 17B, 27, 37, 47, 49a, so that the cemented carbide chips 4, 14A, 14B, 24, 34 are provided.
A, 44, and 49 are prevented from peeling, coming off, or rotating. In addition, since an anchor hole is not provided in the cemented carbide tip 4 and the molten metal is not poured into the hole at the time of casting, a cavity or a defective portion due to incomplete molten metal flow is not formed. The cemented carbide chips 4, 14A, 14B, 24, 34A, 44, 49 can be held by the casting metals 5, 15, 25, 35, 45.

The metal 1 for casting the teeth bit 11
5. Since the hard layers 18, 28 and 38 are respectively formed on a part of the outer surfaces of the casting metal 25 of the teeth bit 21 and the casting metal 35 of the teeth bit 31, the surface is modified and crushing (digging) work is performed. Occasionally, defects are not generated near the cemented carbide chip, and the casting metal is not worn away and becomes thin.

Next, a second embodiment of the present invention will be described with reference to FIGS. This embodiment relates to some examples of the roller bit 322 among the crushing tools shown in FIG. Roller bit 50 shown in FIG.
The roller 52 is provided around the fixed shaft 51 with the bearing 5.
3, and the roller portion 52 is fixed to the fixed shaft 51.
It rotates around. The roller portion 52 is manufactured by casting, and a large number of cylindrical superhard material chips 54 are attached to the surface of the roller portion 52 by the same insert as in the first embodiment. Also, the cemented carbide chip 5
4 has the same shape as the cemented carbide tip 49 of FIG. 6, and a groove-shaped recess 56 is formed on the contact surface of the roller portion 52 with the casting metal 55.

FIG. 13 is a view showing a modification of the roller bit shown in FIG. The roller bit 60 of FIG. 13 is the same as the roller bit 50 of FIG. 12 except that the side surface of the roller portion 62 is tapered. That is, a roller portion 62 is provided around a fixed shaft 61 via a bearing portion 63, and a large number of cylindrical superhard material chips 64 are formed on the surface of the roller portion 62 in the same manner as in the first embodiment. It is attached by the whole. In the cemented carbide chip 64, the casting metal 6 forming the roller portion 62 is formed.
A groove-shaped recess 66 is formed on the contact surface with the groove 5.

The reason why the roller portion 62 having the tapered side surface is employed is that the roller bit 60 attached to the tunnel machine 301 shown in FIG. 1 presses the side surface of the roller portion 62 against the surface to be crushed. This is to prevent slippage due to the difference in tangential speed between the outside and the inside in the radial direction of the tunnel, because the wheel turns along the circumferential direction of the tunnel.

The roller bit having the rounded superhard material tips 54 and 64 as shown in FIGS. 12 and 13 is suitable for relatively crushing hard rock.

FIG. 14 is a diagram showing another modification of the roller bit shown in FIG. Roller bit 70 of FIG.
13 is basically the same as the roller bit 60 of FIG. 13, but a plate-like superhard material chip 74 similar to that shown in FIG. 2 or FIG. The points are different. That is, the cemented carbide chip 74 is attached to the casting metal 75 forming the roller portion 72 by casting, and a projection 76 is formed on the contact surface of the cemented carbide chip 74 with the casting metal 75. ing.

A roller bit having a cemented carbide tip 74 having a sharp tip as shown in FIG. 14 is relatively suitable for crushing soft rock.

FIGS. 15 to 21 show examples of cylindrical superhard material chips cast into the roller bit described with reference to FIGS. However, (a) in each of FIGS. 15 to 21 is a side view of the cemented carbide tip, and (b) is a cross-sectional view taken along the line BB in each direction. The cylindrical cemented carbide tip shown in FIGS. 15 to 21 is the cemented carbide tip 4 shown in FIG.
9 can also be used. The cemented carbide chip 200 shown in FIG. 15 is provided with a groove-shaped recess 201, and the groove-shaped recess 201 is obtained by removing two opposing side surfaces of the cemented carbide chip 200 by a part of a cylindrical surface. It has a unique shape. The cemented carbide tip 210 shown in FIG.
The groove-shaped recess 211 is different from the recess 201 in FIG. 15 in that the bottom surface of the recess is flat. These cemented carbide chips 200 and 210 are similar to the cemented carbide chip 49 of FIG. 6, the cemented carbide chip 54 of FIG. 12, or the cemented carbide chip 64 of FIG. In the case of the cemented carbide chips 200 and 210, the groove-shaped recess 2 is used.
01, 211, the cemented carbide chips 200, 21
Zeros are prevented from rotating about their own central axis.

A cemented carbide tip 220 shown in FIG. 17 has a shape in which a part of a sphere or a part of an ellipse is attached to a lower part of a cylindrical part, and two opposing parts of the lower part are removed by a plane. The cemented carbide tip 230 shown in FIG. 18 is formed by mounting a slightly large cylindrical body at the lower part of the cylindrical part, and removing the two opposing parts of the lower part with a flat surface. As a result, the lower portions of FIGS. 17 and 18 are the convex portions 221 and 231. In the case of FIGS. 17 and 18, the presence of the convex portions 221 and 231 prevents the cemented carbide chips 220 and 230 from coming off, as described above, but is provided on the convex portions 221 and 231. The flat surfaces prevent the carbide chips 220, 230 from rotating about their own central axis.

The cemented carbide chip 240 shown in FIG. 19 has a polygonal prismatic cross section, and has a recess 241. Such a cemented carbide tip 240 is not cylindrical, but is considered to be functionally similar to a cylindrical tip. Also,
In this case, the cemented carbide tip 240 is prevented from rotating around its own central axis by the plane portion 240a of the prism.

The cemented carbide tip 250 shown in FIG. 20 has a concave portion 251 shaped like a ring, and the central axis of the small-diameter portion 252 corresponding to the concave portion 251 is the same as that of the other portion. It is eccentric by e ₁ with respect to the center axis of the hardwood chips 250. The cemented carbide tip 260 shown in FIG. 21 has a slightly larger cylindrical projection 261 at the bottom.
In addition, the central axis of the convex portion 261 is decentered by e _{2 with} respect to the central axis of the cemented carbide tip 260 in other portions. 20 and 21, the central axis of the small diameter portion 252 is deviated from the cemented carbide tip 250, or the central axis of the projection 261 is the cemented carbide tip 2
The eccentricity with respect to the central axis of 60 prevents the carbide tips 250, 260 from rotating about their own central axis.

Also in the present embodiment, similarly to the first embodiment, rotation and removal of the cemented carbide chips 54, 64, 74 can be avoided by the action of the concave portions 56, 66 or the convex portions 76. Also, the cemented carbide chips 54, 64,
Since an anchor hole is not provided in 74 and the molten metal is not poured into the hole at the time of casting, a cavity or a defect is not formed due to incomplete flow of the molten metal, and the cemented carbide chip 54, 64, 74 are casting metals 55, 5
6,57.

In the case where a recess is provided in the cemented carbide tip,
If the angle of the concave surface relative to the cemented carbide chip surface is obtuse, or if the boundary between the cemented carbide chip surface and the concave surface is chamfered, or if the boundary is slightly rounded, The flow of the molten metal into the concave portion is performed more smoothly. Also, if the ratio of the depth of the concave portion to the opening size of the concave portion (for example, the diameter if the concave portion is circular, and the width if the concave portion is groove-shaped) is too large, the flow of the molten metal like the anchor hole may occur. It is not desirable to make the ratio extremely high because of concerns that it will be insufficient.

In the above description, a tooth bit and a roller bit are taken as an example. However, the configuration of the crushing tool and the cemented carbide tip of the present invention is not limited to a copy cutter in the tunnel machine shown in FIG. For other tools and devices such as a wear amount detection sensor that estimates the actual wear amount of tools by measuring the wear amount of material chips, or a roller for a rotary crusher that further crushes crushed rock and makes it easier to carry Can be applied. Further, application to devices other than the tunnel excavator is also possible.

[0044]

According to the present invention, in a cast-in system in which a casting metal is cast with the cemented carbide provided at the tip and the cemented carbide is held, contact of the cemented carbide with the casting metal is performed. Protrusions and recesses are provided on the surface to prevent peeling, detachment, and rotation of the cemented carbide material.Moreover, since an anchor hole is not provided in the cemented carbide material and the molten metal is not poured into the hole, a cavity or a defective portion is Without being formed, the cemented carbide can be reliably held by the casting metal.

Further, since a hard layer is formed on the outer surface of the casting metal excluding the super hard material, it is possible to prevent defects and thinning.

According to the present invention, the life of the crushing tool and the cemented carbide chip for the crushing tool can be extended.

[Brief description of the drawings]

FIG. 1 is a view showing an example of equipment to which a crushing tool of the present invention is attached, and is a view showing a tunnel machine;
(A) is a longitudinal sectional view, (b) is a front view.

FIG. 2 is a view showing a crusher, that is, a tooth bit according to the first embodiment of the present invention, wherein (a) is a side view thereof,
(B) is a view of (a) viewed from the B direction, and (c) is a view of (a) viewed from the C direction.

FIG. 3 is a diagram showing a modification of the teeth bit shown in FIG. 2;

FIG. 4 is a view showing another modified example of the teeth bit shown in FIG. 2;

5A and 5B are diagrams showing still another modified example of the teeth bit shown in FIG. 2, wherein FIG. 5A is a side view, FIG. 5B is a diagram of FIG. It is the figure which looked at (a) from C direction.

FIGS. 6A and 6B are diagrams showing still another modified example of the teeth bit shown in FIG. 2, in which FIG. 6A is a side view thereof, and FIG. 6B is a diagram of FIG.

FIG. 7 is a view showing an example of a plate-shaped cemented carbide chip cast into the teeth bit described with reference to FIGS.
FIG. 4A is a cross-sectional view taken along the line BB in FIG.

FIG. 8 is a view showing another example of a plate-shaped cemented carbide chip cast into the teeth bit described in FIGS. 2 to 6,
(B) is an arrow sectional view from the BB direction of (a).

FIG. 9 is a view showing still another example of a plate-like cemented carbide chip cast into the teeth bit described with reference to FIGS. 2 to 6, wherein (b) is viewed from the BB direction of (a). FIG.

10A and 10B are diagrams showing still another example of a plate-shaped cemented carbide chip cast into the teeth bit described in FIGS. 2 to 6, wherein FIG. 10B is a view from the BB direction of FIG. FIG.

11A and 11B are diagrams showing still another example of a plate-like cemented carbide chip cast into the teeth bit described in FIGS. 2 to 6, wherein FIG. 11B is a view from the BB direction of FIG. FIG.

FIG. 12 is a cross-sectional view showing a crusher, that is, a roller bit according to a second embodiment of the present invention.

FIG. 13 is a diagram showing a modification of the teeth bit shown in FIG.

FIG. 14 is a view showing another modification of the teeth bit shown in FIG. 12;

FIG. 15 is a view showing an example of a cylindrical superhard material chip cast into the roller bit described in FIGS. 12 to 14, wherein (b) is an arrow from the BB direction of (a). FIG.

FIG. 16 is a view showing another example of a cylindrical cemented carbide chip cast into the roller bit described in FIGS. 12 to 14, wherein FIG. 16B is a view from the BB direction of FIG. FIG.

17A and 17B are diagrams showing still another example of the cylindrical superhard material chip cast into the roller bit described with reference to FIGS. 12 to 14, wherein FIG. 17B is a BB direction of FIG. FIG.

FIG. 18 is a view showing still another example of the cylindrical superhard material chip cast into the roller bit described in FIGS. 12 to 14, wherein (b) is the BB direction of (a). FIG.

19A and 19B are views showing still another example of the cylindrical superhard material chip cast into the roller bit described with reference to FIGS. 12 to 14, wherein FIG. 19B is a view in the BB direction of FIG. FIG.

FIG. 20 is a view showing still another example of the cylindrical superhard material chip cast into the roller bit described with reference to FIGS. 12 to 14, wherein (b) is the BB direction of (a). FIG.

FIGS. 21A and 21B are diagrams showing still another example of the cylindrical superhard material chip cast into the roller bit described with reference to FIGS. 12 to 14, wherein FIG. 21B is a BB direction of FIG. FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 tooth bit 4 cemented carbide tip 5 metal for casting 6 convex 11 tooth bit 14A, 14B cemented carbide tip 15 metal for casting 16A, 16B convex 17A, 17B recess 18 hard layer 21 teeth bit 24 cemented carbide tip 25 Casting metal 26 Convex part 27 Concave part 28 Hard layer 31 Teeth bit 34A, 34B Carbide chip 35 Casting metal 36 Convex part 37 Concave part 38 Hard layer 41 Teeth bit 44 Carbide chip 45 Casting metal 46 Convex part 47 Concave part 49 Carbide chip 49a Concave part 50 Roller bit 52 Roller part 54 Carbide chip 55 Casting metal 56 Concave part 60 Roller bit 62 Roller part 64 Carbide chip 65 Casting metal 66 Concave part 70 Roller bit 72 Roller part 74 Carbide Material chip 75 metal for casting 76 recess 100 Material chip 101, 102 Convex part 110 Carbide chip 111 Convex part 112 Concave part 120 Carbide chip 121, 122 Concave part 130 Carbide chip 131 Convex part 132 Concave part 140 Carbide chip 141 Convex part 142 Concave part 200 Carbide material Chip 201 recess 210 superhard tip 211 recess 220 superhard tip 221 recess 230 superhard tip 231 recess 240 superhard tip 241 recess 250 superhard tip 251 recess 252 small diameter portion 260 superhard tip 261 recess 301 Tunnel machine 322 Roller bit 323 Teeth bit

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shigeya Sakaguchi 1-8-2 Minojima, Hakata-ku, Fukuoka, Japan Fukuoka Japan (72) Inventor Toshiyuki Nakagaki 1-2-2 Minojima, Hakata-ku, Fukuoka, Fukuoka No. 8 Inside Nippon Tungsten Co., Ltd. (72) Inventor Shinya Shizuoka 4-4-2 Kita-Kanadate-cho, Tsuchiura-shi, Ibaraki Automobile Co., Ltd. F-term in Tsuchiura Plant (reference) 2D029 FA02 FB01 FC03 FD00

Claims (7)

[Claims] 1. A casting metal is cast with a wear-resistant cemented carbide material provided at its tip, and a diffusion adhesive layer is formed between the cemented carbide material and the casting metal. A crushing tool, wherein a projection is provided on a contact surface of the superhard material with the casting metal. 2. The crushing tool according to claim 1, further comprising a concave portion provided on a contact surface of said cemented carbide material with said casting metal. 3. A method in which a casting metal is cast with a wear-resistant cemented carbide material provided at its tip, and a diffusion adhesive layer is formed between the cemented carbide material and the casting metal. A crushing tool, wherein a concave portion is provided on a contact surface of the superhard material with the casting metal. 4. The crushing tool according to claim 1, wherein a superhard powder previously mixed with a welding agent is applied to an inner surface of the mold except for a position where the superhard material is installed. A crushing tool, wherein a hard layer is formed on an outer surface of the casting metal except for the superhard material by performing casting at the time of casting with a casting metal. 5. A cemented carbide chip for a crushing tool which is wear-resistant and is cast at the tip of the crushing tool by the casting metal while forming a diffusion bonding layer between the metal and the casting metal. A cemented carbide tip for a crushing tool, characterized in that the chip has a convex portion on the contact surface with the metal. 6. The cemented carbide tip for a crushing tool according to claim 5, further comprising a concave portion on a contact surface of the cemented carbide with the casting metal. 7. A cemented carbide chip for a crushing tool, which has wear resistance and is cast by the casting metal at the tip of the crushing tool while forming a diffusion bonding layer between the metal and the casting metal. A cemented carbide chip for a crusher, characterized in that the chip has a concave portion on the surface in contact with the metal.