Research on velocity field modelling of the multi-diameter shaft's shoulder fillet forming by open-die cold extrusion;

The precise equation of shaping curve of right angle step is built in accordance with the volume balance principle,the results of experimental verification show that a satisfying step shaping curve is available.

In this paper, the basic concept was put forward as analyzing the shaping curve of right angle step that possess the quality of density.

Evaluation of the gingival index in metal-porcelain crowns with three configurations shoulder designs in the aged;

Making use of finite soft ANSYS to analyses and compare the three major shape of screw thread including double-shouldered,pitch and screw model,this will afford important reference for kilometer-rig drilling stem.

Based on generally considering all important geometric factors during the forming of insider right-angle step on cross wedge rolling, accurate geometric model and mathematical model accorded with facts were built, and the shaping process of inside right-angle step was divided into three phases.