Liquid Reinforcement

摘要

The following paper describes a strategy for an adaptive reinforcement of additively manufactured objects.The described method aims in particular at the strengthening of geometrically complex objects which can be produced with the so-called powder bed method.The strengthening is carried out by a hardening liquid which is injected into cavities of an additively manufactured shaped object.In order to meet the requirements,the design of the cavities is carried out in a digital optimization process,which takes place before the printing procedure.Cavities filled with injection material act as reinforcement,which can be interlocked with the surrounding material in a force-fit and adhesive manner.The described approach uses the advantages of the powder bed process,which allows the production of shaped parts without significant geometrical restrictions to form tubular cavities.The comparatively high porosity,which is often cited as a weakness of the powder bed process,is also used to form a bond zone between the printed object and the reinforcement strand.The present study deals with basic principles necessary for the automatic control of the penetration depth and the injection process.The investigations are based on a selection of suitable materials.