In this pater, the technical parameters affecting the quality of stagger spinning parts of LY12 tube with big--diameter and thin--wall are analyzed.

In St56-90 CNC precise spinning machine, the thickness of billet thins out from 12mm to 2mm by two-pass stepped spinning.

In this paper,stepped spinning experimental study is carried out.

Research on defects of stainless steel tube stagger spinning process

The 3D FEM model of tube stagger spinning is founded, and the 3D FEM simulation of tube stagger spinning is also achieved.

However, the factors affecting the tube stagger spinning process are too numerous and too complex; it is time-resuming and uneconomical to determine the technical project by experimentation.

According to the up an d down coal mining face features and the advanced experiences of the combined mining for seams with a closed distance at home and broad,the paper rationally set the mining technology and the alternate distance for the up and down seam mining.

On the basis of the 4-dimensional geometric theory of the nonlinear defect continuum,the continuity equations of dislocations and disclinations are derived.

Experirtiments have shown the strong rotation in plastic deformation, which iscaused by the disclination, specific arrangement of dislocation and inhomogeneityof tlie gliding motion of the defects in the rnicroscopic scale.