Förbättrad vakuumtätning mot kabeln under plastextruderingsprocessen
This thesis is about developing a design that provides improved vacuum seal between a lead coating and a plastic coating during plastic extrusion processes of cables. This report is a part of the course MSGC 17 for Bachelor Engineers in mechanical engineering.The work is performed at Nexans Norway AS in Halden where they have a production of high voltage cables for sea-, and offshore industry. A problem they face is that they do not get enough good seal at the attachment to the plastic extrusion machine. They want to achieve a vacuum between a lead coating on the cable and a plastic coating of the cable for plastic extrusion, which is something they do not achieve today. The thesis is thus to come up with a design that provides better sealing against the cable.The work involves a construction part with the phases of product development processes. The phases include: project planning, feasibility study, product specification, concept generation, evaluation/plan selection, Layout/design, detail design, final design and choice of materials. The construction work has been carried out with CAD application Creo Parametrics 2.0. Concept generation has mainly been done through studying the process out in the factory in order to come up with possible concepts that could be applied in the three current extrusion machines. To select the material for the construction, which is in contact with the cabel, a material selection process has been applied using the Ashby?s method and carried out with the assistance of CES edupack materials selection program. The result of the work became a seal, consisting of two axial seals and two thin slices of steel where a rubber gasket in material polyurethane is clamped. On one side of the thin steel discs is guide support to center the cable. The whole design is later forced together between two steel plates that is already present in the attachment to the extrusion machine.The conclusion that can be drawn about the work is that the design complies with the requirements set by the client and that its an appropriate solution to the problem. What remains is to produce a prototype for testing and evaluation. As well as a possible more accurate sizing of the construction.