The introduction of TCI TBM cutters.

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What is TCI?
TCI means Tungsten Carbide Insert, Look at the teeth inserted into the cutter edge, which is the tungsten carbide material with hardness of HRA 85–86.

What can TCI cutter be employed into?
The TCI cutters are mainly suitable for uniformed and high abrasive formations, the rock hardness generally not higher than 160Mpa, and the soft grounds with SPT>=40.

What’s the advantage of TCI cutter?
The longevity of TCI can be 2–8 times of the common cutter. The anti abrasiveness performance is several times higher than the common cutter. And the carbide teeth are wedge-shaped, and the space between the adjacent teeth is 10mm around, which is small that can fully crush the rock surface and form a linear penetration to attain the continuous rock breaking.
The cutter ring matrix is 40CrNiMo alloy steel, and the toughness is several times that of common cutter ring, which can greatly mitigate the fracture risk, and further cut down the downtime cost.

What’s the disadvantage of TCI cutter?
We won’t conceal the disadvantage from our customers, as we all know there is no perfect stuff in this world. Everything has pros and cons.

The disadvantages can be listed as below:
The unit price of the TCI is higher than common cutter;
The impact resistance of the TCI is lower than the common cutter under the complex & compound strata, especially under the upper soft lower hard stratum;
The TCI cutter requires higher tunneling parameter controlling, and can only be adopted in uniformed strata.

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Customized tooling

The nature of the ground conditions determines the choice and positioning of the excavation tools for the cutterhead or the cutting wheel. Only if the tools are perfectly matched to the geology, the TBM can achieve high tunnelling performances. However, the respective ground conditions challenge the reliability of the tools in different places. In soft soils, precautions must be taken to stop the disc cutters from getting clogged. During excavation in hard rock, such as granite, the disc cutters must pass the absolute hardness test.

The correct steel mixture and an exact work process are of crucial importance in the materials composition and production of the disc cutters. The high-alloy tool steel of the cutting ring must not only be very hard to resist wear, the material toughness is also an important factor for its lifetime. Excessively brittle steel would lead to early material spalling at the cutting ring during rock bursts, which happen occasionally. Excavation tools up to 8 inches for smaller excavation diameters are also made of high-alloy tool steel.

In addition to the geology, limited space at the cutterhead and the maximum possible load on the disc cutter bearings are also crucial factors when choosing the appropriate tool size. A wide range of cutting knives, buckets, rippers and other tools complement the spectrum for operations in loose soils. With respect to these types of tools, the durability and material composition are also key factors in optimizing time and costs. The durability of the excavation tool edges and/or teeth is improved enormously by soldering carbide metal – tungsten carbide. Depending on the geology, cutting knives, buckets and rippers are given a welded hardfacing on the tool body to protect it against abrasive soil paste.

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