Shield Cutter

A: The shield cutter rotates at a certain speed. The cutting edges on the cutterhead apply pressure and shear force to the ground material, breaking it into smaller pieces which are then removed from the cutting area.

A: There are disc cutters, which are suitable for hard rock; and drag cutters or scraper cutters, which are more effective in soft ground.

A: The cutterhead is usually made of steel for strength. The cutting edges may be made of tungsten carbide or other hard materials to withstand abrasion.

A: Consider the type of ground (hard rock, soft soil, mixed ground), the diameter of the tunnel, and the required tunneling speed. For hard rock tunnels, disc cutters are often a good choice; for soft soils, drag cutters may be more appropriate.

A: In hard rock, the lifespan of a disc cutter can range from a few hundred meters to a couple of kilometers of tunneling, depending on the rock hardness and abrasiveness. In soft soil, drag cutters may last longer, but their lifespan also depends on soil properties and operating conditions.

A: Optimize the tunneling parameters such as rotational speed and thrust force. Use proper lubrication or cooling systems if applicable. Regularly inspect and maintain the cutter, replacing worn parts in a timely manner.

A: It allows for efficient excavation in various ground conditions. It can create tunnels with a relatively smooth profile, reducing the need for extensive post - excavation lining work. It also provides better control over the tunneling process compared to some traditional excavation methods.

A: Regularly check for wear on the cutting edges. Clean the cutterhead to remove debris. Lubricate moving parts if necessary. Monitor the performance of the cutter and replace damaged or worn - out components.

A: The cutterhead is the main part that holds the cutters. It rotates to bring the cutters into contact with the ground, and it also helps in distributing the thrust and torque during the cutting process.

A: Yes, they can be adapted for different tunnel diameters. However, the design and arrangement of the cutters may need to be adjusted according to the tunnel size.

A: An appropriate rotational speed is crucial. If it's too slow, the tunneling progress will be slow. If it's too fast, it may cause excessive wear on the cutters, reduce the cutting efficiency, or even lead to instability in the tunneling process.

A: The cutterhead is typically fabricated by welding and machining steel plates into the required shape. The cutters are then manufactured separately and assembled onto the cutterhead. For example, disc cutters are made with precision machining of the disc and installation of the cutting inserts.