In this paper, an automatic WAAM technology is proposed to realize the gradient additive remanufacturing of ultra-large hot forging dies. Firstly, a vertical manufacturing strategy and normal are meet different demands. Secondly, basic principle layering design dies developed, wear resistance Ni-based, Co-based, Fe-based alloys at room temperature high analyzed. The Co-based alloy has best high...

in a closed die forging process, it is impossible to form complex shapes in one stage, and thus it becomes necessary to use preform dies. in the present study, backward deformation method and fe simulation via abaqus software has been used in order to design preform die of the h-shaped parts. in the backward deformation method, the final shape of the part is considered as a starting point and u...

In this research, optimization process of axisymmetric extrusion dies is proposed. Plastic zone is analyzed using finite element method in the Eulerian system with flow formulation. The die profiles are defined by Bezier curves with six control points. Two effective functions are considered in this research; standard deviation of the strain rate and the rate of energy consumption during extrusi...

Convective heat transfer about an isothermal, cylindrical extrudate of constant diameter, issuing continuously from an extrusion die, is investigated numerically, using a commercial CFD software package. The hot extrudate is assumed to move vertically downward, thus giving rise to a combined regime of forced and free convection in the surrounding fluid. Prandtl number of 0.707, corresponding to...

ZUSAMEN-FASSUNG:  Die oben angefuerte Erlaeuterung und Dis­kussion umfasst (I)- normale Entwicklung ein­zelner Hauptkomponente des menschlichen Immunmechanismus, ( 2) Faktoren, die moegli­cherweise fetalen Immunsystem aktivieren, (3) Faktoren, welche die Entwicklung des Immun­systems stoeren koennen.  REFERENCES 

ausser der traditionellen nutzung der geothermalen energie sind in jungster zeit neue erkenntnisse und projekte in ausarbeitung, die fur die zukunft ausserst wichtig sein konnen. bei einigen dieser projekte hat man bereits einige sehr positive ergebnisse erzielt. ausserdem wurde klar, das die ausgaben fur exploration,und expleitaion wirtscnaftlich ohneweiteres vsrtretbar sind,j•a sogar in hinbl...

The paper presents the results of studies structure and properties a wire with diameter 0.5 mm from an alloy Al-REM system rare-earth metal content 7–9%. Wire obtained as result implementation technology its manufacture using methods casting into electromagnetic mold (EMM), continuous extruding, drawing. rheological continuously cast round billets experimental are determined. modeling analytica...

Studies based on closed claims are very important in our efforts to improve patient safety. For patients, complications of anaesthesia can be compared with ‘friendly fire’. Harm is done unintentionally by somebody whose aim was to help. Patients may be seriously injured or even die due to a complication of anaesthesia, and such events may also lead to serious psychological consequences for the ...