Plastic Flow’s optimisation software
improved the design of a
square profile die
machinery feature | Modelling software The system is based on finite
difference method and finite element method and shows the capability to calculate the cooling process, the crystal- lisation time and the residual stress distribution in the product.
Sagging occurs due a
temperature difference between the inner and outer walls of the pipe. In the calibration zone, the outer material layer is frozen but because of the low thermal conductivity of the material, it takes a long time until the inner material layer temperature is cold enough to avoid sagging. To analyse the situation, the cooling section of an extru- sion line was measured, then built up as a virtual cooling section in the computational program. The program calculates the likelihood of where sagging will occur – and suggest answers. For instance, it can reduce the time period in which sagging can occur by making changes to the cooling water tempera-
ture. Also, it can assess the effect of having a system to cool the inside of the pipe. In the case of collapsing (or
deformation), this is usually
caused by inhomogenous cooling, which leads to warpage. Again, cooling parameters can be adjusted in order to minimise residual stresses. In this case, cooling water temperature and the lengths of annealing sections between different spray cooling tanks can have a huge
effect, said Saul. He cited one case, in which cooling water temperature was increased from 12°C to 16°C, and an additional air cooling section was added.
Click on the links for more information: ❙
www.plasticflow.com ❙
www.compuplast.com ❙
www.agfiss.de ❙
www.tum.de ❙
www.uminho.pt ❙
www.shs-plus.de
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