Page 55 - Glass Machinery Plants & Accessories no. 2-2020

SCIENCE AND TECHNOLOGY

CHISINAU GLASS

FACTORY

numerical simulation of the

plastic deformation

process of glass mould parts

ne of the various pro- Science and technology
cedures for material This article describes a numerical simulation
cold-work hardening is
O
the smooth finishing by super-
ficial plastic deformation with for the study of one of the procedures used to
hard metallic carbide or diamond
tools. According to this procedure, perform cold-work hardening, used in glass
the active work-piece faces are
pressed with a tool, generally ball- casting equipment manufacture of Chisinau
shaped, which has a spatial com-
pound movement. The contact Glass Factory. The numerical simulation
between tool and work-piece, also
in motion, is force/displacement was applied on work-pieces manufactured
controlled. This paper describes a
numerical simulation for the study by contour turning, some of which were
of the such-like procedure, used in
glass casting equipment manufac- subjected to smooth finishing operation. The
ture of Chisinau Glass Factory. An
accurate physical model for tech- results of the finite element simulation are
nological process was stated. The
attention was focused on the mate- presented in form of coloured maps for stress
rial elastic-plastic properties and on
constitutive equations. The accu- and strain and time-curves, while a critical
racy of the material model formu-
lation was proved, with acceptable interpretation on the performed numerical
results, and validated on the Brinell
hardness test. Using the results of simulation and some conclusions are given.
the same test, the material failure
strain for stress state with negative
triaxiality was increased. The finite tion was applied on work-pieces machine at Polytechnic University
element discretization with more manufactured by contour turn- of Bucharest. The results of the
fine mesh in the superficial layers ing. Some of the physical work- finite element simulation are pre-
of the work-piece active faces was pieces produced on Chisinau Glass sented in form of coloured maps
achieved. The LS-DYNA explicit Factory were subjected to smooth for stress and strain and time-
dynamic code was used for solving finishing operation with a spe- curves. Finally, a critical interpre-
and analyses. Numerical simula- cial device mounted on a turning tation on the performed numerical

glass machinery plants & accessories 2/2020 53