By analyzing the cutting characteristics,the practical drilling conditions,the bit\'s edge type currently available in China and the blade material of the N80 material,a kind of multi-edge staggering tooth tapping bit was designed.

It is characterized by its multi_tooth shape edge, which can manufacture several metal fibers simultaneously.

Stepped and staggered sidecutter is the special miller for machining root rotor slot by Beijing Beizhong Steam Turbine Generator Co.

Combining MAEAM with MD simulation method,both the relaxed structure and strain energy of an a[100] edge dislocation in metal Mo have been simulated systematically in atomic scales.

The interfacial energy of γ/ α interphase boundaries in the undeformde austenite and deformed austenite, the envir onment sensitive embedding energies (E ESE) of C, N and microalloyin g elements Nb , Ti or V (in the form of air mass) in the area of edge dislocation in austenite wer.

The atomic structure model of 1/2 edge dislocation in ferrite phase of steel or iron was set up with computation programmed.

A method of object-oriented computer simulation for the motion pictures and the stress field of edge dislocation;

Atomistic simulation of the relaxed structure and energy of edge dislocation in metal Ta;

Computer simulation for the stress field of edge dislocation;