KR101664307B1 - Manufacturing method of cutter for tunnel boring and Cutter for tunnel boring - Google Patents

Manufacturing method of cutter for tunnel boring and Cutter for tunnel boring Download PDF

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Publication number
KR101664307B1
KR101664307B1 KR1020150047208A KR20150047208A KR101664307B1 KR 101664307 B1 KR101664307 B1 KR 101664307B1 KR 1020150047208 A KR1020150047208 A KR 1020150047208A KR 20150047208 A KR20150047208 A KR 20150047208A KR 101664307 B1 KR101664307 B1 KR 101664307B1
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KR
South Korea
Prior art keywords
pipe
cutter
base material
sintered
material pipe
Prior art date
Application number
KR1020150047208A
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Korean (ko)
Inventor
배영환
Original Assignee
주식회사 파워킹
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
    • E21D9/08—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield

Abstract

The present invention relates to a method of manufacturing a cutter for tunnel excavation, which comprises a pipe arrangement step, an injection step, a sintered part forming step, and a sintered part machining step. In the pipe arranging step, a core pipe having a central portion is hollow and a certain thickness is disposed, and a capsule pipe having a hollow central portion and a larger outer diameter than the parent pipe is disposed to surround the parent pipe and spaced apart from the outer surface of the parent pipe. The injecting step injects the alloy powder into the space between the base material pipe and the capsule pipe. In the sintering step, the sintered alloy powder is sintered by applying a temperature and a pressure, and at the same time, sintered powdered alloy steel is formed by sintering the alloy powder. In the sintering step, the capsule pipe is removed, and the sintered part is processed into a shape of an outer edge for performing the crushing action of the ground.

Description

[0001] The present invention relates to a method of manufacturing a cutter for tunnel excavation,

The present invention relates to a method of manufacturing a cutter for tunnel excavation and a method of manufacturing a cutter for tunnel excavation in which the excavator is mounted on a tunnel excavator and is contacted with the rock, And a cutter for tunnel excavation.

A tunnel boring machine (TBM) is a device used to construct a tunnel while rotating a cutter head having a plurality of disk cutters mounted on the front thereof, and rocking the rock to excavate the tunnel. 1 is a schematic perspective view of an example of a general tunnel excavator. In general, a tunnel excavator 10 has a plurality of disk cutters 12 installed on the front surface of a cutter head 11, There is an advantage that the tunnel can be constructed by continuously performing the support work.

FIG. 2 is a perspective view showing an example of a general disk cutter, and FIG. 3 is a sectional view taken along a line III-III 'in the disk cutter of FIG.

2 and 3, the disk cutter 12 generally comprises a cylindrical body 21, a cutter ring 22 fitted to the outer surface of the body 21, a body 21, A bearing 24 for friction reduction with the inner fixed shaft 23, and a seal ring 25 for internal sealing. The quality and performance of the disc cutter 12 are greatly influenced by the quality and performance of the cutter 22 because the cutter 22 directly contacts the ground in the disc cutter 12 and is crushed.

In manufacturing the cutter ring 22, conventionally, heat treatment is performed so as to have a uniform hardness distribution over the entire section of the cutter 22. Specifically, in the prior art, since the cutter 22 is heat-treated through a step of performing annealing (vacuum heat treatment at a temperature of about 1000 ° C. to 1050 ° C.) followed by tempering (heat treatment at a temperature of about 500 ° C. to 550 ° C.) The entire portion of the end surface of the ring 22 has a uniform hardness distribution.

Since the cutter 22 is heat treated so that the entire cross section of the cutter 22 has a high hardness distribution even though it is the outer edge portion of the cutter 22, It is very difficult to process and the manufacturing cost of the cutter is also increased.

Korean Patent Registration No. 0195310 (Registered on Feb. 11, 1999, entitled "Cutter for Tunnel Excavator")

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a cutter for tunnel excavation by sintering a sintered portion and joining the sintered portion to the base material portion, thereby facilitating the machining of the cutter A manufacturing method of a cutter for tunnel excavation which can reduce the production cost of the cutter, and a cutter for tunnel excavation.

In order to accomplish the above object, the present invention provides a method of manufacturing a cutter ring for tunnel excavation, comprising the steps of: disposing a base material pipe having a hollow central portion and a predetermined thickness, a capsule pipe having a hollow central portion and a larger outer diameter than the base material pipe, A pipe arrangement step surrounding the base material pipe and disposed at a distance from the outer surface of the base material pipe; An injection step of injecting alloy powder into a space between the base material pipe and the capsule pipe; A sintering step of sintering the alloy powder by applying a temperature and a pressure to sinter the alloy powder and joining the sintered portion of the powdered alloy steel to the base metal pipe; And a sintered part processing step of removing the capsule pipe and processing the sintered part into a shape of an outer blade for performing the crushing action of the ground.

In order to accomplish the above object, the present invention provides a method of manufacturing a cutter for tunnel excavation, comprising the steps of: providing a base material pipe having a hollow central portion and a predetermined thickness, having a central hollow portion, an outer diameter larger than the base material pipe, A pipe arranging step of disposing a capsule pipe having a shape corresponding to an outer shape of a cutter for tunnel excavation surrounding the base material pipe and spaced apart from the outer surface of the base material pipe by a predetermined distance; An injection step of injecting alloy powder into a space between the base material pipe and the capsule pipe; A sintering step of sintering the alloy powder by applying a temperature and a pressure to sinter the alloy powder and joining the sintered portion of the powdered alloy steel to the base metal pipe; And a capsule pipe removing step of removing the capsule pipe.

The method for manufacturing a cutter for tunnel excavation according to the present invention is characterized in that it is carried out between the step of forming the sintered part and the step of machining the sintered part and the step of forming the capsule pipe, Cutting the tunneling cutter according to the width of the cutter for tunneling to be manufactured.

The method of manufacturing a cutter ring for tunnel excavation according to the present invention is characterized in that it is carried out between the step of forming the sintered part and the step of removing the capsule pipe and the step of forming the capsule pipe, Cutting the tunneling cutter according to the width of the cutter for tunneling to be manufactured.

In the method of manufacturing a cutter for tunnel excavation according to the present invention, a polishing step of polishing an inner surface of the base material pipe may be further included.

In the method of manufacturing a cutter for tunnel excavation according to the present invention, the base material pipe and the sintered portion may be formed of different materials and bonded to each other.

In the method of manufacturing a cutter for tunnel excavation according to the present invention, the base material pipe may be formed of a carbon steel material, and the sintered portion may be formed of a titanium carbide alloy material.

In order to achieve the above object, the present invention provides a cutter for tunnel excavation, comprising: a base material pipe having a hollow central portion and a predetermined thickness; And a sintered portion formed by bonding a powdered alloy steel sintered with the alloy powder to an outer surface of the base material pipe and protruding outwardly in order to break the rock in contact with the rock.

In the cutter for tunnel excavation according to the present invention, the base material pipe and the sintered portion may be formed of different materials and may be bonded to each other.

In the cutter for tunnel excavation according to the present invention, the base material pipe may be formed of a carbon steel material, and the sintered portion may be formed of a titanium carbide alloy material.

INDUSTRIAL APPLICABILITY According to the method for manufacturing a cutter for tunnel excavation and the cutter for tunnel excavation according to the present invention, it is possible to facilitate the machining of the cutter and reduce the production cost of the cutter.

1 is a schematic perspective view of an example of a general tunnel excavator,
2 is a perspective view showing an example of a general disk cutter,
3 is a cross-sectional view taken along the line III-III 'in the disk cutter of FIG.
4 is a view illustrating a method of manufacturing a cutter for tunnel excavation according to an embodiment of the present invention,
5 is a view showing a method of manufacturing a cutter for tunnel excavation according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a method for manufacturing a cutter for tunnel excavation and embodiments of a cutter for tunnel excavation according to the present invention will be described in detail with reference to the accompanying drawings.

4 is a view showing a method of manufacturing a cutter for tunnel excavation according to an embodiment of the present invention.

Referring to FIG. 4, a method of manufacturing a cutter for tunnel excavation according to an embodiment of the present invention includes the steps of preparing a cutter for tunnel excavation, which is mounted on a tunnel excavator and rotates while contacting with the rock, And includes a pipe arrangement step S10, an injection step S20, a sintered part forming step S30, a cutting step S40, a sintered part processing step S50, and a polishing step.

In the pipe arrangement step S10, the base material pipe 110 and the capsule pipe 120 are disposed.

The base material pipe 110 is a pipe or a round bar shape having a predetermined thickness and a hollow central portion. The capsule pipe 120 also has a predetermined thickness, a hollow pipe or a round bar shape, and a larger outer diameter than the parent pipe 110. Since the capsule pipe 120 is removed after the sintering process is completed in the future, it is preferable that the thickness of the capsule pipe 120 is thinner than the thickness of the base material pipe 110.

The capillary pipe 120 is disposed concentrically with the parent material pipe 110 while the parent material pipe 110 is disposed in the pipe arrangement step S10 of the present embodiment, Is arranged at a distance from the outer surface (111) of the base material pipe (110).

The injecting step S20 injects the alloy powder 101 into the space between the base material pipe 110 and the capsule pipe 120. At this time, the alloy powder 101 to be injected is an alloyed power metal manufactured by an atomization technique and is sintered into a powdered alloy steel through a sintering step S30 to be described later.

In the sintering step (S30), the alloy powder (101) is sintered, and the sintered portion (130) of the powdered alloy steel is bonded to the base material pipe (110).

In the sintered part forming step S30 of this embodiment, the alloy powder 101 can be sintered by applying temperature and pressure to the alloy powder 101 by using a hot isostatic press (HIP) process. In the HIP process, an inert gas (N 2, Ar, etc.) is placed in a high-pressure vessel, and a certain pressure is applied by using a compressor. When the temperature is raised to a high temperature (for example, 2000 degrees maximum), inert gas expands, kg / cm2 ~ 2,000kg / cm2) is formed and pressure is applied in all directions. The HIP process removes voids and micropores in the sintered product, which can improve abrasion resistance and resistance.

When the alloy powder 101 is sintered using the HIP process or the like, the alloy powder 101 can be sintered and bonded to the mother material pipe 110. That is, the alloy powder 101 is sintered by the HIP process or the like to form a sintered portion 130 made of powdered alloy steel. The sintered portion 130 can be bonded to the mother material pipe 110 at the same time as sintering. The sintered portion 130 joined to the base material pipe 110 can be processed into a portion of the outer blade 131 which is in direct contact with the ground through the sintered portion processing step S50 to be described later to perform the fracture action.

In this embodiment, the base material pipe 110 and the sintered portion 130 may be formed of different materials and bonded to each other. That is, the base material pipe 110 may be formed of a carbon steel material such as S45C, and the sintered portion 130 may be formed of a powdered alloy steel material such as a titanium carbide alloy (Alloy-TiC).

Powdered alloy steels are characterized by high toughness and high abrasion resistance. They show excellent performance in improving the abrasion resistance of rolling rolls for cold and hot rolling, pinch rollers, guide rollers, conveying rollers, etc., and they are widely used at home and abroad.

In the cutting step S40, the encapsulation pipe 120, the sintered portion 130, and the base material pipe 110 are cut along the longitudinal direction of the base material pipe 110 on the basis of the width of the cutter for tunnel excavation to be manufactured .

The step S40 may be a step performed after the sintering step S30 when a plurality of cutters for tunnel excavation are simultaneously produced. If the cuttering for tunnel excavation is to be manufactured one by one in the manufacturing process, the cutting step S40 of the present embodiment does not need to be performed.

In the sintering process step S50, the capsule pipe 120 is removed and the sintered portion 130 is processed into a desired shape.

When the capsule pipe 120 is removed, the inner surface portion of the sintered portion 130 is bonded to the base material pipe 110, and the outer surface thereof may be formed into a smooth round surface shape corresponding to the inner surface shape of the capsule pipe 120 . In the sintered part processing step (S50) of this embodiment, as shown in Fig. 4, the rounded sintered portion 130 having such a smooth surface is cut into a shape of the outer edge 131 .

The polishing step polishes the inner surface of the base material pipe 110. The inner surface of the parent pipe 110 is a portion coupled to the disc cutter and can be machined to the correct dimensions through the grinding step.

Referring to FIG. 4, there is shown a cutter 100 for tunnel excavation manufactured by the above-described method of manufacturing a cutter for tunnel excavation.

The cutter ring 100 for tunnel excavation according to the present embodiment comprises a base material pipe 110 and a sintered portion 130.

The base material pipe 110 has a predetermined thickness and the central portion is formed into a hollow pipe shape. The sintered portion 130 is formed by joining the powdered alloy steel sintered with the alloy powder 101 to the outer surface of the parent material pipe 110. After the sintering is completed, the sintered portion 130 may be processed to protrude outward in order to contact the rock to break the rock.

The material of the base material pipe 110, the material of the sintered portion 130, and the like are the same as those described above in the process of manufacturing the cutter for tunnel excavation, and thus a duplicate description will be omitted.

The method of manufacturing a cutter for tunnel excavation and the cutter for tunnel excavation according to the present embodiment configured as described above can manufacture a cutter for tunnel excavation in such a manner that the sintered portion is sintered with alloy powder and bonded to the parent material pipe, It is not necessary to perform the heat treatment of the cutter in order to uniformly distribute the hardness of the entire portion of the cutter cross section after cutting the entire cutter as in the conventional art.

Therefore, the manufacturing method of the cutter for tunnel excavation and the cutter for tunnel excavation in this embodiment facilitates the machining of the cutter, and the effect of reducing the manufacturing cost of the cutter can be obtained.

The method of manufacturing a cutter for tunnel excavation and the tunneling excavation cutter of the present embodiment constructed as described above can simultaneously cut a tunneler excavation cutter and cut the tunneler excavation cutter, It is possible to obtain a reduction effect.

In addition, the cutter for tunnel excavation of the present embodiment configured as described above has the effect of making the excavated distance of the powdered alloy steel stronger against abrasion resistance during abrasion and resistant to abrasion to 1.2 to 1.3 times longer than the conventional one .

5 is a view illustrating a method of manufacturing a cutter for tunnel excavation according to another embodiment of the present invention. In Fig. 5, the members denoted by the same reference numerals as those shown in Figs. 1 to 4 have the same configuration and function, and a detailed description thereof will be omitted.

5, a method of manufacturing a cutter for tunnel excavation according to the present embodiment includes a pipe arrangement step S10 ', a closing step S20', a sintered part forming step S30 ', a cutting step S40 ', A capsule pipe removing step S50', and a polishing step.

The pipe arranging step S10 'places the base material pipe and the capsule pipe.

The base material pipe 110 is a pipe or a round bar shape having a predetermined thickness and a hollow central portion. The capsule pipe 220 has a predetermined thickness, a hollow center pipe or a round bar shape and an outer diameter larger than that of the base material pipe 110.

The inner surface 221 of the capsule pipe 220 of this embodiment has a shape corresponding to the outer shape of the cutter 200 for tunnel excavation to be manufactured. The shape of the outer edge 231 of the cutter for tunnel excavation is formed to protrude outwardly. The inner surface 221 of the capsule pipe also has a shape corresponding to this shape.

In the pipe arrangement step S10 ', the base material pipe 110 is arranged first, and the capsule pipe 220 is disposed concentrically with the base material pipe 110 while surrounding the base material pipe 110, And is spaced apart from the outer surface 111 of the pipe by a predetermined distance.

The injecting step S20 'injects the alloy powder 101 into the space between the base material pipe 110 and the capsule pipe 220. The injecting step S20 'of the present embodiment is substantially the same as the injecting step S20 of the embodiment shown in FIG. 4, and thus redundant description will be omitted.

The sintered part forming step S30 'sinter the alloy powder 101 and bonds the sintered portion 230 of the powdered alloy steel to the base material pipe 110. Since the sintered part forming step S30 'of this embodiment is substantially the same as the sintered part forming step S30 of the embodiment shown in Fig. 4, a duplicate description will be omitted.

The cutting step S40 'is performed by cutting the encapsulation pipe 220, the sintered part 230 and the base material pipe 110 along the longitudinal direction of the base material pipe 110 with reference to the width of the cutter for tunnel excavation to be manufactured. do.

The cutting step S40 'of the present embodiment is different only in the point that is performed between the sintered part forming step S30' and the capsule pipe removing step S50 ', and the rest is the cutting step S40 ), And duplicate explanations are omitted.

The capsule pipe removing step (S50 ') removes the capsule pipe (220).

Since the inner surface 221 of the capsule pipe of the present embodiment has a shape corresponding to the outer shape of the cutter ring 200 for tunnel drilling to be manufactured, after the capsule pipe 220 is removed, the sintered portion 230 is further protruded A step of machining into a shape of a blade 231 is not required. However, since the sintered portion 230 is formed to be somewhat larger than the dimension of the desired outer edge 231 in the sintered portion forming step S30 ', the sintered portion 230 may be machined to an exact dimension of the outer edge 231. [

The polishing step polishes the inner surface of the base material pipe 110. The inner surface of the parent pipe 110 is a portion coupled to the disc cutter and can be machined to the correct dimensions through the grinding step.

The inner surface of the capsule pipe having the shape corresponding to the outer shape of the cutter for tunnel excavation to be manufactured in the method of manufacturing the cutter for tunnel excavation according to this embodiment configured as described above, It is not necessary to process it into the shape of the outer edge 231. Therefore, the manufacturing method of the cutter for tunnel excavation of the present embodiment can obtain the effect of simplifying the machining process of the cutter.

The scope of the present invention is not limited to the above-described embodiments and modifications, but can be implemented in various forms of embodiments within the scope of the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

101: alloy powder
110: base metal pipe
120: Capsule pipe
130:

Claims (10)

A capsule pipe having a hollow central portion and a predetermined thickness and disposed at a central portion thereof and having an outer diameter larger than that of the parent material pipe and having a small thickness is disposed concentrically around the parent material pipe, A piping arrangement step spaced apart;
An injection step of injecting alloy powder into a space between the base material pipe and the capsule pipe;
A sintering step of sintering the alloy powder by applying a temperature and a pressure to sinter the alloy powder and joining the sintered portion of the powdered alloy steel to the base metal pipe; And
And a sintered part machining step of removing the capsule pipe and machining the sintered part into a shape of an outer blade for performing the crushing action of the ground,
Wherein the base material pipe and the sintered portion are formed of different materials and are joined to each other, wherein the base material pipe is formed of a carbon steel material, the sintered portion is made of a titanium carbide alloy material,
The alloy powder is produced by a microfabrication technique, and the sintered portion is formed by sintering in the sintered portion forming step, and the sintered portion is bonded to the base material pipe, and voids and micropores are removed from the sintered portion. Of the cutter ring for tunnel excavation. A core pipe which is hollow and has a predetermined thickness, a capsule pipe having a hollow central portion and an outer diameter larger than that of the parent pipe and having a small thickness is disposed concentrically around the parent pipe, A piping arrangement step spaced apart;
An injection step of injecting alloy powder into a space between the base material pipe and the capsule pipe;
A sintering step of sintering the alloy powder by applying a temperature and a pressure to sinter the alloy powder and joining the sintered portion of the powdered alloy steel to the base metal pipe; And
And a capsule pipe removing step of removing the capsule pipe,
Wherein the base material pipe and the sintered portion are formed of different materials and are joined to each other, wherein the base material pipe is formed of a carbon steel material, the sintered portion is made of a titanium carbide alloy material,
The alloy powder is produced by a microfabrication technique, and the sintered portion is formed by sintering in the sintered portion forming step, and the sintered portion is bonded to the base material pipe, and voids and micropores are removed from the sintered portion. Of the cutter ring for tunnel excavation. The method according to claim 1,
Between the sintering step forming step and the sintering step forming step,
And cutting the encapsulation pipe, the sintered portion and the base material pipe along the longitudinal direction of the base material pipe with reference to the width of the cutter for tunneling to be manufactured. A method of manufacturing a cutter. 3. The method of claim 2,
Between the sintering portion forming step and the capsule pipe removing step,
And cutting the encapsulation pipe, the sintered portion and the base material pipe along the longitudinal direction of the base material pipe with reference to the width of the cutter for tunneling to be manufactured. A method of manufacturing a cutter. 3. The method according to claim 1 or 2,
Further comprising a polishing step of polishing an inner surface of the base material pipe. delete delete The central portion of which is hollow and has a certain thickness; And
And a sintered portion formed by joining the powdered alloy steel sintered with the granulated powder to an outer surface of the base material pipe and protruding outwardly for breaking the rock in contact with the rock,
Wherein the sintering section is manufactured by the method of manufacturing a cutter for tunnel excavation according to any one of claims 1 to 4. delete delete
KR1020150047208A 2015-04-03 2015-04-03 Manufacturing method of cutter for tunnel boring and Cutter for tunnel boring KR101664307B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106640105A (en) * 2017-02-13 2017-05-10 中铁十九局集团轨道交通工程有限公司 Soft land layer shield pile grinding system and pile grinding method
KR102007137B1 (en) 2019-01-17 2019-08-02 안석 Cutterring alloy steel for tunnel boring and manufacturing method of the same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08291695A (en) * 1995-02-23 1996-11-05 Kawasaki Heavy Ind Ltd Cutter ring of tunnel excavator and method for mounting the same
KR100195310B1 (en) 1995-12-19 1999-06-15 정찬길 Cutter for drill machine
US20110259150A1 (en) * 2010-04-23 2011-10-27 Hall David R Disc Cutter for an Earth Boring System
US20120039739A1 (en) * 2010-08-10 2012-02-16 David Krauter Cutter rings and method of manufacture

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08291695A (en) * 1995-02-23 1996-11-05 Kawasaki Heavy Ind Ltd Cutter ring of tunnel excavator and method for mounting the same
KR100195310B1 (en) 1995-12-19 1999-06-15 정찬길 Cutter for drill machine
US20110259150A1 (en) * 2010-04-23 2011-10-27 Hall David R Disc Cutter for an Earth Boring System
US20120039739A1 (en) * 2010-08-10 2012-02-16 David Krauter Cutter rings and method of manufacture

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106640105A (en) * 2017-02-13 2017-05-10 中铁十九局集团轨道交通工程有限公司 Soft land layer shield pile grinding system and pile grinding method
KR102007137B1 (en) 2019-01-17 2019-08-02 안석 Cutterring alloy steel for tunnel boring and manufacturing method of the same

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