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Litian Heavy Industry Machinery Co., Ltd
Litian Heavy Industry Machinery Co., Ltd
TBM Disc Cutter

TBM Disc Cutter

TBM disc cutter is a disc-shaped roller cutter mounted on the cutterhead of tunnel boring machine, which is an excavation tool for breaking hard rocks. The type of disc cutters, in different sizes and specifications, can be mounted on the cutter heads of large trenchless construction equipment such as TBM, shield machine, MTBM, pipe jacking machine, SBU (Small Boring Unit), shaft boring extension machine, and are widely used in subway tunnels, railway tunnels, diversion tunnels, urban underground pipe network construction, mining and other industries.

Litian has been conducting research on the materials, heat treatment process and manufacturing process of the TBM disc cutter components, combined with on-site testing to make improvements. As a result, the TBM disc cutters produced by Litian heavy industry has been in a leading position in the industry in terms of wear resistance, high temperature oxidation resistance, toughness. Litian TBM roller cutter can adapt to the needs of multiple types of engineering, and can meet the requirements of long-distance excavation under the compound strata of highly weathered rock, moderately weathered rock, slightly weathered rock, and has good stability and reliability.


Specifications Of Different Disc Cutters

Cutter Type

Diameter

Bearing Capacity [tonne]

Structure

[inch]

[mm]

Single Disc Cutter

Double Disc Cutter

20"

508

35, 42

Monoblock / Assembly

19"

483

35, 42

Monoblock / Assembly

18"

457

28

Monoblock / Assembly

17"

432

28, 32(single disk)

Monoblock / Assembly

15 1/2"

394

22

Monoblock / Assembly

Single Disc Cutter

Double Disc Cutter

Triple Disc Cutter


12 1/2"

320

16

Monoblock / Assembly

12"

305

16

Monoblock / Assembly

11"

280

13

Monoblock / Assembly

10"

250

10

Monoblock / Assembly

9"

220

9

Monoblock

8"

200

8

Monoblock

7"

180

8

Monoblock

6 1/2"

165

5

Monoblock

6"

150

4

Monoblock

Twin Disc Cutter

Center Disc Cutter

18"

457

42

Assembly

17"

432

45

Assembly

15 1/2"

394

45

Assembly

13"

330

40

Assembly

12"

305

35

Assembly



TBM Disc Cutter Features



  • Manufacturing technique: Our advanced CNC machine tools can ensure the consistency of the size of the cutter components. Combined with strict and standardized assembly process to ensure the torque of the disc cutter. Adjust the torque in an appropriate range, so that it can well meet the requirements of the surrounding rock geology for the starting torque of the disc cutter, which is helpful to avoid partial wear of the disc cutters in different strata. We have a unique heat treatment process, which can meet the unity of wear resistance and toughness, and improve the service life of the disc cutter.


  • Sealing system: The sealing system of our disc cutter adopts the world famous brand metal sealing system. During the assembly of the disc cutter, the distortion of the rubber ring may lead to air leakage, and this hidden danger is difficult to detect. We use special technology to assemble the disc cutter to correct the distortion of the rubber ring, eliminate the hidden danger of metal seal air leakage, and ensure the sealing reliability of the disc cutter.


  • Bearing system: Our disc cutter bearings are heavy-duty tapered roller bearings, which can bear the combined radial and axial load strength at the same time.

FAQs of TBM Disc Cutter

FAQs of TBM Disc Cutter

What is the working principle of TBM disc cutter?

TBM disc cutter is pressed on the rock surface to be broken by the hydraulic system of the machine. In the process of working, the disc cutter rotates around its own axis, and at the same time it revolves around the central axis of the cutter head as the cutter head rotates. Under the combined action of the rotating torque of the cutter head and the vertical thrust of the propulsion cylinder, the disc cutters distributed on the cutter head cut out a group of concentric circles on the tunnel face. When the compressive strength of the rock is lower than the thrust of the cutter head, the rock will be directly broken by the cutter blade, thus forming multiple concentric grooves. With the advance of the cutter head, the groove depth gradually deepens, and the blade penetrates into the rock, forming crushing zones and radial cracks. Under further pressure, when the hob spacing meets certain conditions, the surface crack of the adjacent rock mass expands gradually, and finally the rock between the adjacent concentric grooves collapses, and the rock breaking process of the disc cutters is completed.

What's the suggestion for TBM disc cutter replacement?

In the case of normal wear, we recommend that the disc cutter needs to be replaced when the cutter ring of gauge cutter is worn out about 10-15mm, and the cutter ring of face cutter and center cutter is worn out about 20-25mm. At this time, the cutting edge of the cutter ring becomes wider and its ability to cut rocks is reduced. The torque and thrust required for TBM tunneling will increase, which increases the load of the TBM hydraulic system and motor system, and the crushed rock will also wear the cutter head, thereby reducing the service life of the TBM.

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