Rock cutting tools - their arrangement on full face tunnel boring machines

The material of disc cutters is important to full-face tunnel boring machines (TBM). In recent years, disc cutters were optimized and tested by many scholars all around the world. H13(4Cr5MoSiV1) steel is widely used due to its excellent properties, especially in TBM disc cutters. In this paper, H13 steel with optimized composition was prepared and heat treatment. The high temperature compression of H13 steel was conducted at the temperatures ranging from 100 °C to 700 °C, with strain rate at 0.01 s−1. The stress-strain curves, Rockwell hardness and microstructure of H13 steel after compression were obtained and analyzed. The results showed that the compression strength and hardness decreased as the temperature increased; and the compression strength, hardness and ductility decreased rapidly between 600 °C and 700 °C, HR700 (the hardness of H13 steel at 700 °C) only reached 33.23 HRC. It is not recommended for TBM disc cutters to work in an environment over 600 °C.

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Ventilation and safety related problems when driving headings in coal mines with full face tunnel boring machines

10.4095/304718 ◽

1983 ◽

Author(s):

A W Stokes ◽

L B Geller

Keyword(s):

Coal Mines ◽

Tunnel Boring Machines ◽

Tunnel Boring ◽

Boring Machines ◽

Full Face

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804117 Factors influencing the performance of full-face, hard rock tunnel boring machines

International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts ◽

10.1016/0148-9062(80)91209-7 ◽

1980 ◽

Vol 17 (4) ◽

pp. A67

Keyword(s):

Hard Rock ◽

Tunnel Boring Machines ◽

Tunnel Boring ◽

Factors Influencing ◽

Boring Machines ◽

Full Face ◽

Rock Tunnel

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Prediction of load on the cutting tools in tunnel boring machines

Acta Montanistica Slovaca ◽

10.46544/ams.v25i4.01 ◽

2020 ◽

pp. 444-452

Keyword(s):

Neural Network ◽

Cutting Tools ◽

Circular Cross Section ◽

Tunnel Boring Machine ◽

Correct Identification ◽

Tunnel Boring Machines ◽

Tunnel Boring ◽

Cutting Insert ◽

Boring Machines ◽

Network Type

A tunnel boring machine (TBM) is a machine that is used to excavate tunnels with a circular cross-section. TBMs can bore through a variety of ground conditions. Tunnel boring machines are used as an alternative to drilling methods. TBMs have the advantages of limiting the disturbance to the surrounding ground. Predicting the load on cutting tools in tunnel boring machines is important for the mining process. The article presents a proposal for a method of forecasting the load on mining machinery tools. This paper presents current trends in hard rock tunnelling, including the directions of research on automated excavation processes. Particular emphasis is put on the aspects of predicting load variations in the cutterhead tools, which is of vital importance for machine power selection and mining process control, among others. The problem of predicting the load and wear of excavation tools plays an important role in designing and maintaining cutterheads. The effective monitoring of the operation of multi-tool cutterhead knives and their replacement time depend on correct identification of the type and condition of the excavating tool cutting insert. A neural network with a multilayer perceptron structure was used as a prediction tool. The concept of this network type is based on the arrangement of neurons in successive layers. This neural network type is treated as an input-output model. Its parameters include weights and threshold values.

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