JP5139968B2 - Cutter bit - Google Patents

Description

  The present invention relates to a cutter bit that is attached to a drilling blade of a ground excavator and cuts a natural ground.

  Cutter bits are installed in various excavators used for construction of excavation holes and excavation grooves for tunnel construction by shield construction method, propulsion construction method, TBM, etc., construction of cast-in-place piles, construction of underground underground walls, etc. .

The cutter bit wears out as the ground is excavated. Therefore, at the time of excavation work, it was necessary to replace the cutter bit worn at every predetermined excavation distance (excavation depth) with a new cutter bit.
Such exchanging work of the cutter bit needs to be performed by interrupting the excavation work, which hinders the shortening of the construction period and the construction cost.

For this reason, various types of cutter bits have been developed for the purpose of extending the life of the cutter bits.
For example, in Patent Document 1, as shown in FIG. 10A, an inner bit 111 attached to a cutter head 100, an outer bit 112 formed so as to cover the outer surface of the inner bit 111, and an outer bit 112 A multiple bit 110 for a tunneling machine is disclosed that includes fixing brackets 113, 113 that sandwich and support the pin between the inner bit 111 and the inner bracket 111.

  According to the multiple bit 110, when the outer bit 112 is worn due to cutting of the natural ground, the outer bit 112 is automatically dropped by breaking into two at the worn portion (see FIG. 10 (b)). Since the bit 111 is exposed (see FIG. 10C), excavation work can be continuously performed without the need to replace the cutter bit.

JP 2007-327266 A

However, in the conventional multiple bit 110, since the fragments 112 ′ and 112 ′ of the detached outer bit 112 are mixed in the excavated sediment, various equipment may be damaged when the excavated sediment is carried out.
For example, when used for a muddy water shield, the blade 112 'may be damaged by contact with the blade of the agitator, or the mud pump or valve may be damaged.
In the case of a mud pressure shield, the stirring blade may be damaged by the contact of the fragments 112 ′ of the outer bit 112 with the stirring blade.

  The present invention has been made to solve the above problems, and proposes a cutter bit that can reduce the frequency of replacement due to wear and reduce the risk of damage to an excavator or the like. Let it be an issue.

In order to solve such a problem, the invention according to claim 1 includes a bit body, a plurality of blade portions stacked on the bit body, and a wear adjusting material interposed between the blade portions. the a cutter bit comprising a fixing unit for fixing the both ends of the blade portion, the fixing portion is a groove wall of the formed corner portion of the bit body groove, from the cutting portion Further, it is made of a material that is easily worn out and has sufficient rigidity and strength as a structural member , and the plurality of blade portions are stacked inside the groove .

Further, the invention according to claim 2, the bit body, a plurality of cutters layer laminated on the bit body, a cutter bit Ru wherein the cutter layer includes a blade portion, the blade portion A wear adjusting material laminated on the back side and a fixing part for fixing the end of the blade part are provided , and the fixing part is more easily worn away than the blade part and has sufficient rigidity and strength as a structural member. material is composed by having a thickness of superposed said wear adjustment member and the blade portion, and wherein the same thickness der Rukoto and the fixed portion.

In the cutter bit of the present invention, the wear of the fixed portion proceeds faster than the wear of the blade portion, but since the thickness of the blade portion is adjusted by the wear adjusting material, the fixed portion is worn and the blade portion is not fixed. The blade can be used up at the same time as it is cut.
When the blade portion is worn away and the wear adjusting material is exposed, the wear proceeds quickly and the next blade portion is exposed. Therefore, the time until the sharp state of the cutter bit is recovered is shortened.

Therefore, the cutter bit is configured so that the next blade part (cutter layer) is automatically exposed when the outermost blade part (cutter layer) is worn. It becomes possible to reduce.
Moreover, since the blade portion is not worn out, it is possible to reduce the risk of damage to the excavator or the like due to the fragments of the blade portion.

The invention according to claim 3 is a cutter bit comprising a bit body and a plurality of cutter layers stacked on the bit body, wherein the cutter layer is stacked on a blade portion and a back side of the blade portion. And an end portion of the blade portion is fixed to the lower cutter layer or the bit body by brazing via the fixing wear adjusting material. Tei Te, thickness superposed with the wear adjusting member and the blade portion, and wherein the same thickness der Rukoto said securing wear adjusting material.

  The invention according to claim 4 is the cutter bit according to claim 3, wherein the blade portion has a surface area on the bit body side (inside) smaller than a surface area on the opposite side (outside). Further, it is characterized by being formed in a trapezoidal cross section.

  According to such a cutter bit, when the blade portion is worn by a predetermined amount as the ground is excavated, the blade portion is peeled off from the bit body at the brazed portion. Further, since the blade portion is formed in a trapezoidal cross section, the brazed portion is widened with wear of the blade portion, and the worn blade portion is easily peeled off.

  The invention according to claim 5 is the cutter bit according to any one of claims 1 to 4, wherein the bit body is peeled off to peel off the blade portion worn by excavation. It is characterized by having a mechanism.

  According to such a cutter bit, since the blade portion can be easily removed via the peeling mechanism, the sharp state of the cutter bit can be quickly recovered.

  According to the cutter bit of the present invention, it is possible to reduce the frequency of replacement accompanying wear and to reduce damage to an excavator or the like.

  DESCRIPTION OF EMBODIMENTS Preferred embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the same reference numerals are used for the same elements, and duplicate descriptions are omitted.

<First Embodiment>
As shown in FIG. 1, the cutter bit 1 according to the first embodiment includes a bit body 10, a plurality of (two in FIG. 1) blade portions 11 stacked on the bit body 10, and the blade portions 11. And a wear adjusting material 12 interposed therebetween.

The bit body 10 is a so-called shank material. The bit body 10 is formed with a groove portion 14 for accommodating the blade portion 11 at a corner portion. Both end portions (both side surfaces) of the blade portion 11 accommodated in the groove portion 14 are fixed by the groove wall (fixed portion 13).
The bit body 10 (fixed portion 13) is made of a material that is more easily worn than the blade portion 11 and has sufficient rigidity and strength as a structural member. In the present embodiment, an SS material or an S45C material is used as a material constituting the bit body 10, but the material constituting the bit body 10 is not limited.

  The blade part 11 is a member constituted by a cemented carbide tip. In the present embodiment, the bit body 10 is arranged by being stacked in a plurality of grooves 14.

The blade portion 11 is formed with an acute angle on the tip side (outside in a state where it is disposed on the bit body 10). The blade portion 11 is configured to cut a natural ground with a tip formed at an acute angle.
The rear end side of the blade part 11 is recessed in a V shape corresponding to the shape of the front end side, and is formed so as to be able to accommodate the front end part of another blade part 11 disposed inside the blade part 11. ing.

The wear adjusting material 12 is a copper or copper alloy plate material (hereinafter simply referred to as “copper plate”) fixed to the back surface (rear end surface) of the blade portion 11.
In the present embodiment, a copper plate is used as the wear adjusting material 12, but the material constituting the wear adjusting material 12 is worn more than the blade portion 11 and the bit body 10 (fixed portion), which are carbide tips. The material is not limited to copper or a copper alloy as long as it is a material that functions as a thermal stress relieving material when the blade portion 11 is brazed, and may be a metal such as an aluminum alloy, for example.

  The fixing method to the groove part 14 of the blade part 11 and the wear adjusting material 12 is not limited, For example, what is necessary is just to carry out by brazing, welding, adhesion | attachment, etc.

  When the cutter bit 1 is worn by cutting a natural ground, as shown in FIG. 2A, the cutter bit 1 is more easily worn than the blade portion 11, and is formed of a material having sufficient rigidity and strength as a structural member. The fixed portion 13 wears faster than the blade portion 11.

On the other hand, since the thickness of the blade portion 11 is adjusted by the wear adjusting material 12, the blade portion 11 is almost used up when the fixing of the end portion by the fixing portion 13 is released.
When the blade 11 is no longer worn, the wear adjusting material 12 is exposed. Since the wear adjusting material 12 is a material (copper) that is more easily worn than the fixed portion 13 (bit body 10), the wear proceeds faster than the fixed portion 13, and as shown in FIG. The next blade 11 is exposed.

  As mentioned above, according to the cutter bit 1 which concerns on 1st Embodiment, even if the blade part 11 is worn out by cutting, since the new blade part 11 is exposed automatically, the sharp state of the cutter bit 1 is quickly. To be restored. Therefore, it is possible to reduce the replacement frequency of the cutter bit without reducing the excavation efficiency.

Further, by interposing the wear adjusting material 12, it is possible to effectively use the blade portion 11 made of an expensive super hard tip (hard metal), which is economical.
Since the blade portion 11 is not peeled off in the form of large pieces, it does not adversely affect various equipment facilities when the excavated soil is discharged. Moreover, since it is not necessary to collect the blade portion 11 from the excavated earth and sand, it is possible to omit labor required for the collection operation.

  The blade portions 11 are not stacked in direct contact with each other, but are stacked with the wear adjusting material 12 interposed therebetween, so that the outer blade portion 11 that is worn and rounded remains for a long period of time. There is no. Moreover, since the inner blade part 11 is exposed when the wear adjusting material 12 is worn, the sharp state is quickly restored.

<Second Embodiment>
As shown in FIG. 3, the cutter bit 2 according to the second embodiment includes a bit body 20 and a plurality of (two layers in FIG. 3) cutter layers 2 a and 2 b stacked on the bit body 20. Configured.

  The bit body 20 is a so-called shank material and is a member having corners formed at acute angles. The material constituting the bit body 20 is not limited. For example, an SS material or an S45C material can be appropriately selected from known materials and used.

Each of the cutter layers 2 a and 2 b includes a blade portion 21, a wear adjusting material 22 stacked on the back side of the blade portion 21, and a fixing member (fixing portion) 23 that fixes an end portion of the blade portion 21. .
The cutter layers 2a and 2b cover the corner surfaces of the bit body 20 in a stacked state.

  The blade part 21 is a plate-like member constituted by a cemented carbide tip. In the present embodiment, the two blade portions 21 and 21 are combined in a V shape and arranged at the corner portion formed at an acute angle of the bit body 20.

  In the present embodiment, the end portion of the blade portion 21 is fixed by the fixing member 23. The blade portion 21 is adjusted to a thickness equivalent to that of the fixing member 23 by being arranged in a state of being overlapped with the wear adjusting material 22.

The wear adjusting material 22 is a copper plate fixed to the inner surface of the blade portion 21.
The wear adjusting material 22 is formed so that the thickness of the blade portion 21 and the wear adjusting material 22 overlapped with each other is the same as that of the fixing member 23. It is fixed.

  In the present embodiment, a copper plate is used as the wear adjusting material 22, but the material constituting the wear adjusting material 22 is more easily worn than the blade portion 21 and the fixed portion 23, and the blade portion 21 and the fixed portion are used. If it is a material which functions as a thermal stress relaxation material when brazing 23, it will not be limited to copper.

  The fixing member 23 is a member that fixes the blade portion 21 and the wear adjusting material 22 to the bit body 20 at the end portions thereof. In the present embodiment, the fixing member 23 is made of a steel plate. The fixing member 23 is fixed to the bit body 20 by brazing the inner surface thereof.

The fixing member 23 has the same thickness as the thickness obtained by superimposing the blade portion 21 and the wear adjusting material 22.
In this embodiment, a steel plate is used as the fixing member 23. However, the material constituting the fixing member 23 is a steel plate as long as it is a material that is more easily worn than the blade portion 21 and has sufficient rigidity and strength as a structural member. It is not limited to.

  In this embodiment, as shown in FIG. 3, the auxiliary steel plate 24 is interposed between the cutter layer 2a and the cutter layer 2b.

  The auxiliary steel plate 24 is a member for fixing the wear adjusting material 22 and the fixing member 23 of the cutter layer 2a disposed on the outside. Although the auxiliary steel plate 24 is integrally fixed to the fixing member 23 of the cutter layer 2b disposed inside, the auxiliary steel plate 24 is in contact with the blade portion 21 of the cutter layer 2b with a low fixing degree.

When the cutter bit 2 is worn by cutting a natural ground, as shown in FIG. 4A, the fixing member 23 made of a material that is more easily worn than the blade portion 21 is worn faster.
Since the blade portion 21 is formed thinner than the fixing member 23 by interposing the wear adjusting material 22, the fixing member 23 is worn and the fixing degree of the end portions of the blade portion 21 and the wear adjusting material 22 is lowered. When it is done, the blade portion 21 is also worn down to a state where it is almost used up.

  When the blade 21 is worn and the wear adjusting material 22 is exposed, the wear adjusting material 22 and the auxiliary steel plate 24 interposed therebelow are made of a material that is relatively easy to wear, and therefore, as shown in FIG. In this way, the next cutter layer 2b is exposed by wearing out immediately.

  Note that, even when the wear of the fixing portion 23 progresses faster than the wear of the blade portion 21 and the wear adjusting material 22 in the cutter layer 2a, the auxiliary steel plate 24 peels off from the cutter layer 2b as shown in FIG. As shown in b), the cutter layer 2b is exposed in a sharp state.

  As mentioned above, according to the cutter bit 2 which concerns on 2nd Embodiment, since the blade part 21 was laminated | stacked in the state in which the wear adjustment material 22 or the auxiliary steel plate 24 intervened, the worn and rounded blade part 21 remains. There is nothing to do. That is, when the cutter layer 2a is worn, the next cutter layer 2b is quickly exposed and the sharp state is restored.

  Since the operational effect of the cutter bit 2 according to the other second embodiment is the same as that of the cutter bit 1 of the first embodiment, detailed description thereof is omitted.

  In the second embodiment, the case where the auxiliary steel plate 24 is arranged has been described. However, the auxiliary steel plate 24 may be arranged as necessary, as in the cutter bit 2 ′ shown in FIG. The auxiliary steel plate 24 may be omitted.

  According to the cutter bit 2 ′, as shown in FIG. 5B, when the blade portion 21 is worn and the wear adjusting material 22 is exposed, the wear adjusting material 22 is made of a material that is relatively easily worn. Therefore, as shown in FIG. 5 (c), the next cutter layer 2b is exposed by wearing out immediately.

  When the progress of the wear of the fixed portion 23 is faster than the progress of the wear of the blade portion 21 and the wear adjusting material 22 in the cutter layer 2a, the reaction force of the blade portion 21 and the wear adjusting material 22 cannot be taken and peels off from the cutter layer 2b. As a result, as shown in FIG. 5C, the cutter layer 2b is exposed in a sharp state.

Further, the wear adjusting material 22 may be formed in a shape that covers the surface of the blade portion 21 of the cutter layer 2b disposed on the inner side, like a cutter bit 2 ″ shown in FIG.
According to the cutter bit 2 ″, as shown in FIG. 6B, even when the wear of the fixed portion 23 is faster than the wear of the blade portion 21 and the wear adjusting material 22 in the cutter layer 2a. The blade portion 21 of the cutter layer 2b is not partially exposed, and the blade portion 21 and the wear adjusting material 22 are peeled off from the cutter layer 2b due to the fact that the reaction force cannot be removed. As shown in c), the cutter layer 2b is exposed in a sharp state.

  As described above, according to the cutter bits 2 ′ and 2 ″, the blade portions 21 are stacked with the wear adjusting material 22 interposed therebetween, so that the blade portions 21 that are worn out and are not rounded remain. When the layer 2a is worn, the next cutter layer 2b is quickly exposed and the sharp state is restored.

<Third Embodiment>
As shown in FIG. 7, the cutter bit 3 according to the third embodiment includes a bit body 30 and a plurality of (two layers in this embodiment) cutter layers 3a and 3b stacked on the bit body 30. I have.

  Since the configuration of the bit body 30 is the same as that of the bit body 20 of the cutter bit 2 shown in the second embodiment, detailed description thereof is omitted.

Each of the cutter layers 3 a and 3 b includes a blade portion 31 and a wear adjusting material 32 laminated on the back side of the blade portion 31.
The cutter layers 3a and 3b cover the surface of the corner of the bit body 30 in a stacked state.

The blade part 31 is a plate-like member constituted by a cemented carbide tip. In the present embodiment, the outer surface of the bit body 30 is covered by arranging a plurality of blade portions 31 side by side.
The blade portion 31 is formed in a trapezoidal cross section so that the surface area on the bit body 30 side (inner side) is smaller than the surface area on the opposite side (outer side).

  In this embodiment, the edge part of the blade part 31 is fixed to the other adjacent blade part 31 and the lower cutter layer 3b or the bit body 30 by silver brazing. The blade portion 31 is arranged in a state where the blade portion 31 is overlapped with the wear adjustment material 32, so that the blade portion 31 is adjusted to have a thickness equivalent to that of the fixing portion (fixing wear adjustment material 33).

  The wear adjusting material 32 is a copper plate fixed to the back side of the blade portion 31. Since the configuration of the wear adjusting material 32 is the same as that of the wear adjusting material 22 shown in the second embodiment, detailed description thereof is omitted.

  The fixing wear adjusting material 33 fixes the blade portion 31 and the wear adjusting material 32 to the adjacent blade portion 31, the inner cutter layer 3 b or the bit body 30 by brazing. In the present embodiment, the fixing wear adjusting material 33 is made of the same material as that of the bit body 30 and the blade portion 31 and the wear adjusting material 32 are fixed. However, the material to be used is not limited. Further, in the present embodiment, the fixing wear adjusting material 33 is disposed in the fixing portion, and the end portions of the blade portion 31 and the wear adjusting material 32 are brazed and fixed thereto, but the fixing wear adjusting material is used. You may fix the edge part of the blade part 31 and the wear adjustment material 32 only by brazing, without arrange | positioning 33. FIG.

  The fixing wear adjusting material 33 has the same thickness as the thickness of the blade portion 31 and the wear adjusting material 32 overlapped.

When the cutter bit 3 is worn by cutting a natural ground, as shown in FIG. 8 (a), it is more easily worn than the blade portion 31, and the fixing wear adjustment is made of a material having sufficient rigidity and strength as a structural member. The material 33 wears faster.
When the fixing wear adjusting material 33 is worn, the degree of fixing at the end of the blade portion 31 is lowered, so that the blade portion 31 may be peeled off. Since the blade portion 31 is formed thinner than the fixing wear adjusting material 33 by interposing the wear adjusting material 32, when the fixing wear adjusting material 33 is worn and the fixing degree of the end portion is lowered. The blade portion 31 is also worn to a state where it is almost used up.

  When the blade portion 31 is worn, the wear adjusting material 32 is exposed. The wear adjusting material 32 is often peeled off, but is composed of a material that is relatively easy to wear, and therefore wears quickly even if it does not peel off. As the wear adjusting material 32 is peeled off or worn, the next cutter layer 3b is exposed as shown in FIG. 8B.

  As described above, according to the cutter bit 3 according to the third embodiment, since the blade portion 31 is formed in a trapezoidal cross section, the surface area of the fixing wear adjusting material 33 increases as the blade portion 31 wears. The wear of the wear adjusting material 33 is promoted. Therefore, the blade part 31 or the wear adjusting material 32 after wear is easily peeled off, and the next cutter layer 3b is quickly exposed to restore the sharp state of the cutter bit 3 relatively quickly.

  Since the operational effects of the cutter bit 3 according to the other third embodiment are the same as those of the cutter bit 1 of the first embodiment, detailed description thereof is omitted.

<Fourth embodiment>
As shown in FIG. 9A, a cutter bit 4 according to the fourth embodiment includes a bit body 40 and a plurality of (two layers in this embodiment) cutter layers 4a and 4b stacked on the bit body 40. And is configured.

Each of the cutter layers 4 a and 4 b includes a blade portion 41, a wear adjusting material 42 stacked on the back side of the blade portion 41, and a fixing member (fixing portion) 43 that fixes an end portion of the blade portion 41.
The cutter layers 4a and 4b cover the surface of the corner of the bit body 40 in a stacked state.

  The bit body 40 is a so-called shank material, and is a member having corners formed at acute angles. The material constituting the bit body 40 is not limited. For example, an SS material or an S45C material can be appropriately selected from known materials and used.

  As shown in FIG. 9B, the bit body 40 has a hydraulic passage 44 and a hydraulic chamber 45 formed at the other end of the hydraulic passage 44, so that hydraulic pressure can be applied from the inner surface of the blade portion 41. It is configured.

The hydraulic path 44 is made of a pipe material that penetrates the bit body 40, and the tip abuts against the inner surface of the blade portion 41. At the other end of the hydraulic path 44, a hydraulic chamber 45 is provided in the bit body 40, oil or the like is injected into the hydraulic chamber 45 after the bit is manufactured, and the hydraulic chamber lid 46 is tightened with screws or the like. Keep pressure.
The hydraulic path 44 functions as a part of a peeling mechanism for causing the hydraulic pressure in the hydraulic chamber 45 to act on the blade portion 41 and peeling the blade portion 41 from the cutter bit 4.
The inner diameter and the like of the hydraulic path 44 are not limited and can be set as appropriate.

The blade part 41 is a plate-like member constituted by a cemented carbide tip.
As shown in FIG. 9A, a through-hole is formed in the blade portion 41 of the cutter layer 4b disposed on the inner side corresponding to the position of the hydraulic path 44, and the hydraulic path is connected to the through-hole. A hydraulic path 44 reaching the blade 41 of the outer cutter layer 4a is formed by inserting the tube material.

  In addition, since the matter regarding the structure of the blade part 41 is the same as the content of the blade part 21 shown in 2nd Embodiment, detailed description is abbreviate | omitted.

  The wear adjusting material 42 is a copper plate that is integrally fixed to the inner surface of the blade portion 41. A through hole is formed in the wear adjusting material 42, and the hydraulic path 44 is formed by inserting a pipe material that becomes the hydraulic path 44 into the through hole.

  In addition, since matters related to the wear adjusting material 42 are the same as those of the wear adjusting material 22 shown in the second embodiment, a detailed description thereof will be omitted.

  The fixing member 43 is a member that fixes the blade portion 41 and the wear adjusting material 42 to the cutter layer 4b or the bit body 40 at the end portions thereof. Since the structure of the fixing member 43 is the same as that of the fixing member 23 shown in the second embodiment, detailed description thereof is omitted.

When the cutter bit 4 is worn by cutting a natural ground, the fixing member 43 made of a material having sufficient rigidity and strength as a structural member is more easily worn than the blade portion 41 and wears faster.
As wear progresses, the blade 41 becomes round and the cutting ability of the cutter bit 4 decreases (see FIG. 4A).

  Thus, when the blade part 41 remains round, the worn blade part 41 is peeled off from the cutter bit 4 by applying hydraulic pressure from the inner surface of the blade part 41. As a result, the sharp blade 41 of the inner cutter layer 4b can be exposed, and the cutting ability of the cutter bit 4 can be quickly restored.

  Since the operational effects of the cutter bit 4 according to the other fourth embodiment are the same as those of the cutter bit 1 according to the first embodiment, detailed description thereof is omitted.

In the cutter bit 4, an auxiliary steel plate that is a member for fixing the outer cutter layer 4a may be interposed between the outer cutter layer 4a and the inner cutter layer 4b.
At this time, the auxiliary steel plate may be integrally fixed to the fixing member 43 of the inner cutter layer 4b and fixed to the blade portion 41 of the inner cutter layer 4b with a low degree of fixing. Thereby, when the outer cutter layer 4a is worn due to cutting and the auxiliary steel plate is exposed, it quickly peels off, so that the sharp blade 41 of the inner cutter layer 4b is exposed.

As mentioned above, although preferred embodiment was described about this invention, this invention is not limited to said each embodiment, A design change is possible suitably in the range which does not deviate from the meaning of this invention.
For example, the purpose of use of the cutter bit in each of the above embodiments is not limited, and can be applied to all types of cutter bits such as a preceding bit, a main bit, and a double-headed bit.

  Moreover, it can be employed as a cutter bit for any excavator used for excavation of natural ground, such as tunnel excavators such as shield machines and propulsion machines, and ground excavators that excavate vertical grooves of grooves and piles.

The number of blades or cutter layers stacked is not limited, and can be set as appropriate.
Further, it is not always necessary to use a hydraulic mechanism for the peeling mechanism. For example, a hydraulic mechanism or a pneumatic mechanism may be used.
Further, the cross-sectional shape of the blade portion is not limited and can be set as appropriate.

It is sectional drawing which shows the cutter bit which concerns on 1st Embodiment. (A) And (b) is sectional drawing which shows the use condition of the cutter bit shown in FIG. It is sectional drawing which shows the cutter bit which concerns on 2nd Embodiment. (A) And (b) is sectional drawing which shows the use condition of the cutter bit shown in FIG. It is a modification of the cutter bit which concerns on 2nd Embodiment, (a) is sectional drawing, (b) And (c) is sectional drawing which shows the use condition of (a). It is another modification of the cutter bit which concerns on 2nd Embodiment, (a) is sectional drawing, (b) And (c) is sectional drawing which shows the use condition of (a). It is sectional drawing which shows the cutter bit which concerns on 3rd Embodiment. (A) And (b) is sectional drawing which shows the use condition of the cutter bit shown in FIG. (A) is sectional drawing which shows the cutter bit which concerns on 4th Embodiment, (b) is the elements on larger scale of (a). (A)-(c) is sectional drawing which shows the conventional cutter bit.

Explanation of symbols

1, 2, 3, 4 Cutter bit 10, 20, 30, 40 Bit body 11, 21, 31, 41 Blade portion 12, 22, 32, 42 Wear adjustment material 13 Fixing portion 23, 43 Fixing member (fixing portion)
33 Abrasion adjusting material for fixing 44 Hydraulic path (peeling mechanism)
45 Hydraulic chamber 46 Hydraulic lid

Claims (5)

Cutter comprising a bit body, a plurality of blade portions that are stacked on the bit body, a wear adjustment member interposed between the adjacent said blade portion, and a fixing unit for fixing the both ends of the respective blade section A bit,
The fixing portion is a groove wall of a groove formed in a corner portion of the bit body, and is made of a material that is more easily worn than the blade portion and has sufficient rigidity and strength as a structural member .
The cutter bit, wherein the plurality of blade portions are stacked inside the groove . A cutter bit comprising a bit body and a plurality of cutter layers stacked on the bit body,
The cutter layer includes a blade portion, a wear adjusting material laminated on the back side of the blade portion, and a fixing portion that fixes an end portion of the blade portion,
The fixing portion is configured by a material that is more easily worn than the blade portion and has sufficient rigidity and strength as a structural member ,
Cutter bits thickness superposed with the wear adjusting member and the blade portion, characterized in same thickness der Rukoto and the fixed portion. A cutter bit comprising a bit body and a plurality of cutter layers stacked on the bit body,
The cutter layer includes a blade portion, a wear adjusting material laminated on the back side of the blade portion, and a fixing wear adjusting material .
The edge of the blade is fixed to the lower cutter layer or the bit body by brazing via the fixing wear adjusting material ,
Thickness superposed with the wear adjusting member and the blade portion, wherein the same thickness der Rukoto said securing wear adjusting material, the cutter bit.   The cutter bit according to claim 3, wherein the blade portion is formed in a trapezoidal cross section so that a surface area on the bit body side is smaller than a surface area on the opposite side.   The cutter bit according to any one of claims 1 to 4, wherein the bit body includes a peeling mechanism for peeling the blade portion worn by excavation.

Images