Zhao De-wen

The integral as a function of the upper limit and an analytical solution to plane strain drawing and extrusion

A kinematically admissible velocity field which is different from Avitzurs is established in Cartesian Coordinates. An upper-bound analytical solution to strip drawing and extrusion is obtained by using the integral as a function of the upper limit in this paper.

Solution for plane strain forward and backward extrusions with a fractional reductionR=0.5 by the integartion depending on a parameter

AbstractA parameter t is introduced to boundary slip line of rigid regions for plane strain and indirect extrusions with a fractional reduction R=0.5. Integration by substitution has been used along the boundary slip line in order to obtain the extrusion pressure. By the integration depending on a parameter, the following results are obtained,

The curvilinear integral problems to velocity field for drawing through parabolic dies

\bar p/2R = 1.29

Low-carbon high-strength hot rolling wire with compound reinforced ultrafine grains and its production process

and die pressure is 5.14k for backward extrusion;

Analysis and study of dieless drawing process for rod based on radial direction gradient slab method

\bar p/2R = 1.29

Method for predicting dog bone shape of rolled piece after vertical rolling

and pad average pressure is 2.57k for forward extrusion. All the results from this method are the same as those of the conventional solution.