Sheet metal extrusion is a metal forming process in which the movement of a punch penetrates a sheet metal surface and it flows through a die orifice; the extruded parts can be deflected to have an extrusion cavity and protrusion on the opposite side. Therefore, this process results in a narrow region of highly localized plastic deformation due to the formation and microstructure effect on the ...

When epithelia become too crowded, some cells are extruded that later die. To extrude, a cell produces the lipid, Sphingosine 1-Phosphate (S1P), which activates S1P₂ receptors in neighboring cells that seamlessly squeeze the cell out of the epithelium. Here, we find that extrusion defects can contribute to carcinogenesis and tumor progression. Tumors or epithelia lacking S1P₂ cannot extrude cel...

Rubber profiles fabricated by means of extrusion are widely used in civil engineering, e.g., in pipeline constructions and for window sealings. The dimensioning of injection heads for the extrusion of rubber profiles is exclusively based on empiric knowledge of the non-linear flow behaviour of elastomers, basically of the so-called die swell. The swelling of the extrudate when emerging from a c...

Abstract This paper deals with the reconstruction of the inlet temperature profile of a melted polyethylene (PE) flowing through an extrusion die. The inverse heat transfer problem is formulated as an optimisation problem by considering both the energy and the Navier-Stokes equations. It is solved by using the conjugate gradient algorithm. Experimental results are presented and show the effect ...

This paper investigates a technique to find an optimal set of conditions for an isothermal process to extrude a product for a given shape and material properties with minimal defects. The inputs to this model are: the product geometry and its material data such as flow curve and microstructure during dynamic recrystallization. This is an inverse problem and the model is formulated as a non-line...

This paper highlights a novel technique for monitoring viscosity in polymer extrusion. The device represents a noninvasive technique based on ‘Soft Sensor’ technology; involving sophisticated process modelling and the integration of available on-line data to correct and adjust the model in response to errors and disturbances. The Soft Sensor measurements show excellent performance relative to a...

With the I-type plastic extrusion die for example, the advantages and disadvantages between the traditional design method and optimization design method were compared. The design was studied via finite element numeric analysis combined with optimization, whose objective was the equal average flow velocity of each sub-field of profile cross section at extrusion die. And the optimization design w...