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Metodik för Finita Element Analys av pressverktyg i NX Nastran
2016 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The tooling department at Gestamp HardTech designs and manufactures press hardening tools that are used within the company. To make sure that the tool casts can withstand the forces that occur during a pressing operation FEM-simulations have to be performed. A method for creating a FE-model was developed to make it easier for the designers to perform simulations in a limited amount of time, as well as increasing the accuracy of the results. Several different methods for applying loads were tested. Using forming simulations from LS-DYNA the force distribution on the forming surface was obtained. This distribution was applied to the FE-model in NX Nastran which was then solved using both the nodal forces and the maximum pressing force. Another method involved using a rigid surface to represent the upper tool half which had the maximum pressing force applied to it and a contact condition against the forming dies. Simulations were also performed using a pressure load on the forming die surface similar to how it has been done in the past in order to have a reference to compare the new methods to. A manual for building a FE-model was written which describes all the steps from CAD-model to solution. The maximum deformation, which was 0,218 mm, occurred when using a pressure load on the surface which is lower than the maximum allowed value of 0,4 mm. Experimental data from the real pressing operation could not be obtained and whether or not any of the new methods are more accurate than the old one could not be determined.

Place, publisher, year, edition, pages
2016. , 65 p.
Keyword [en]
Technology
Keyword [sv]
Teknik, NX, Nastran, FEM, presshärdning, hållfasthet
Identifiers
URN: urn:nbn:se:ltu:diva-52939Local ID: a032aca1-abc8-4e47-8d1d-452c708bad5cOAI: oai:DiVA.org:ltu-52939DiVA: diva2:1026312
External cooperation
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Supervisors
Examiners
Note
Validerat; 20160609 (global_studentproject_submitter)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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