部分用户案例磁注射成型模拟simulation of magnetic injection moulding

1、Simulation of Magnetic Injection Moulding Erich Ogur Warwick Manufacturing GroupInternational Automotive Research Centre The University of WarwickContentsIntroductionObjectiveModel DefinitionModel BuildingResultsConclusionsSimulation of Magnetic Injection Moulding IntroductionIn order to predict the

2、 behaviour of systems, simulation is performed to reduce the costs of experiments The combination of polymer-magnetic material and magnetic fields is certainly bound to lead to new applications e.g. Novel magnetic storage mediaIntroduction (Contd)It is expected that the mechanism governing pigment o

3、rientation will be influenced by: polymer-magnetic material rheologymelt temperaturemould temperaturemagnetic field strength. Introduction (Contd)It therefore essential to develop a robust computational tool to:Study the transport properties of the magnetic particles under external magnetic fieldSEM

4、 of Nickel FlakesIntroduction (Contd)This presentation reports the effect of an external magnetic field and its interaction with polymer mixed with ferromagnetic nickel flakes in injection mouldingThis effect has been modelled using FEMLABObjectiveTo develop a 2-D simulation tool for the magnetic in

5、jection moulding process using FEMLABResearch QuestionsWhat is the appropriate combination of magnetic material and polymer that can be influenced by a magnet?What is the magnetic field strength that is sufficient to cause the polymer-magnetic material interaction?What types of polymer materials (ch

6、aracteristics and properties) that are ideal for use in these kinds of applications.MagnetostaticsThe basic equations of magnetostatics:Magnetostatics (Contd)The relationship between B and H is described by the constitutive equation: B = (H + M)Defining a Magnetic Vector Potential A such that:Magnet

7、ostatics (Contd)Combining the equations we get:Polymer Flow EquationsTo be able to predict and model the polymer melt flow the conservation of momentum and conservation of mass laws must be satisfied Energy EquationIn order to solve the heat transfer during injection moulding, the governing equation

8、 for energy must be solvedHeat transfer by conduction, convection and dissipation must balance with the heat storage capacity of the polymerConstitutive EquationsDescribe material behaviour as a function of processing and applied conditionsMagnetization CurveM is the induced magnetization of the mag

9、netic fluidVolume Force TermThe Volume force term (F) which is primarily made up of the Magnetic force is given by:Model BuildingTo build the Model in FEMLAB I have used three application Modes:The Magnetostatics application mode for magnetic field calculationsThe Non-Newtonian application mode for

10、the mass & momentum transferThe Convection and Conduction application mode for heat transferModel BuildingModel Building - GeometryModel BuildingMultiphysics Settings - MagnetostaticsBoundary Settings - MagnetostaticsMultiphysics Settings Non-Newtonian FlowBoundary Settings - Entrance Non-Newtonian

11、FlowBoundary Settings Mould Walls Non-Newtonian FlowBoundary Settings - Exit Non-Newtonian FlowMultiphysics Settings Energy ConservationBoundary Settings - Entrance Energy ConservationBoundary Settings Mould WallsEnergy ConservationBoundary Settings - ExitEnergy ConservationMesh GenerationComputing

12、Solution - MagnetostaticsThe magnetostatic problem is a stationary non-linear problemIndependent of fluid flowSensible to solve it firstComputing SolutionComputing Solution - MagnetostaticsResults: MagnetostaticsComputing Solution - MagnetostaticsComputing Solution Balance EquationsComputing Solutio

13、n Balance EquationsComputing Solution Balance EquationsResults: Final SolutionResults: Final Solution (Zoom)Results: Final Solution (Streamlines Applied)Results: Final Solution (Streamlines Applied) - ZoomResults: Final Solution (Streamlines Applied) - ZoomResults: Final Solution (Streamlines Applied) - ZoomConclusionsIn this presentation, I have developed a 2-D model to simulate the effect of magnetic field in injection moulding.The ferromagnetic nickel flakes in the polymer e magnetized in the presence of an external magnetic field in the injection moulding environment. ConclusionsThe simul