|
|
Numerical modelling of the glass shaping forms cooling
Havelková, Martina ; Schovánek, Petr
The purpose of heat treatment of semi finished glass pieces in shaping forms is not only to fit their shape but also to reduce internal stresses. Thermal differences are unwanted and have to be eliminated in the cooling procedure of the glass pieces. Simulations of different types and sizes of shaping forms and complex model cooling were accomplished. The aim of these simulations was to optimise geometrical parameters, clamping conditions and material of the form, so that thermal differences at glass or glass – form interface are minimized during the cooling.
|
|
| |
|
| |
|
|
Optimalizace parametrů laserového přetavování povrchu
Chmelíčková, Hana ; Kaňa, J. ; Hiklová, Helena ; Lapšanská, Hana ; Havelková, Martina
Laser beam with power density 102 W.mm-2 causes metal surface melting without material vaporization. Temperature gradient between melted spot centre and solid state boundary is formed, surface structure is changed. Cooling rate affects melted zone microstructure. In result, surface quality, porosity, homogenization, mechanical and chemical resistivity are improved. Laser melting parameters optimization of steel samples was made by means of pulsed solid state laser with average power 100 W. Energy, pulse length, feed speed and laser beam diameter were subsequently changed. Melted traces on steel surface were analyzed to discover microstructure and dimensions of affected zones. Result dependence on process parameters was evaluated and optimal parameters were chosen.
|
|
| |
|
| |
|
| |
|
| |
|
| |
guest ::
RSS feed.