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Micromorphological investigation of visible pores of soils from the surroundings of Drahnetice near Tabor

100%

Palan J.

Zeszyty Problemowe Postępów Nauk Rolniczych

1972

tom 123

Micromorphology and micromorphometry of chernozem

63%

Palan J.

Zeszyty Problemowe Postępów Nauk Rolniczych

1972

tom 123

Continuous extrusion of commercially pure titanium GRADE 4

45%

Palan J. , Taboada J. V. , Kubina T. , Malecek L. , Hodek J.

tom Vol. 69, nr 1

33--37

Purpose: Continuous extrusion of metals using Conform™ machine is used to introduce severe plastic deformation and to improve mechanical properties of metals by reducing their grain size. This paper describes a development of a continuous extrusion sequence for Ti grade 4 in the CONFORM 315i machine. Design/methodology/approach: The influence of material flow conditions on the surface quality of final extruded rods was analyzed with the FEM-based DEFORMTM software. Findings: During the development, several process parameters were varied, such as the die chamber temperature and the extrusion velocity. Research limitations/implications: The goal was to conduct the experiment at the lowest possible temperature in order to achieve a maximum strain hardening effect. The material’s mechanical properties and its flow through the die chamber were studied. The homogeneity of the material flow and the surface quality of final rods were then optimized. Originality/value: The effort led to improvements in the analytical model used in the FEM simulation so that the surface quality can now be optimized more efficiently.