As the main cutting tool of Tunnel Boring Machine (TBM) for rock-breaking, rock-breaking efficiency TBM disc cutters directly affects TBM’s boring speed, which in turn overall progress tunnelling project. Therefore, a simple and accurate evaluation method is an essential prerequisite to improve performance TBM. In this paper, classical force prediction equations were summarized applicability ea...

Honing is a process for finishing surfaces to obtain smooth surface. This process is used for final polish of inner parts such as engines cylinders. Optimizing this process has always been a big challenge for mass production of cylinder blocks of internal combustion engines. Honing process has some variable parameters, thus to get their optimum rates the automobile cylinders were tested. In thi...

Abstract The application of appropriate excavation equipment in difficult grounds is crucial importance and consequently improves the performance hard rock Tunnel Boring Machines (TBMs). cutterhead one main components TBMs which directly involved process, its design can highly affect cutting efficiency, overall balance head, bearing long term, wear whole face muck buckets. This paper mainly foc...

A theory for tunneling between a real surface and a model probe tip, applicable to the "scanning tunneling microscope" is presented. The tunneling current is found to be proportional to the local density of states of the surface, at the position of the tip. It can be shown that the tunneling conductance has exponential dependence on the distance of the nearest approach to the surface

Over the last several decades mechanical mining machines have developed into highly productive, light weight, mobile machines which are able to economically mine many soft rock ore bodies. Due to the utilization of disc cutters Tunnel Boring Machines, with great mass and limited mobility, have developed the ability to cut the hardest rocks at high production rates. Technological advancements ha...

This proposed method has to design and fabricate the Multipurpose Jig and Fixture, for that component which has been to reduce the manufacturing cycle time. When the component produced on a small size previously this is to produces the large quantities of requirements. The selective components requires for machining operations such as step milling, angle milling & boring and reaming. The few op...

Storytellers have many strategies for luring in their audience and keeping them interested. These include standardized narrative structures, vivid characters, breaking down long stories into episodes, and subtle methods of reminding the readers of facts they may have forgotten. The typical style of writing mathematics systematically avoids these strategies, since the explicit goal is “proving a...