Abstract. The spring industry has to process ultra-high strength spring strips of the steel grade 1. . Springback during bending is a limiting factor for resource-efficient production processes in the so-called stamping bending technology. This paper reports a mainly experimental investigation on the influence of bending parameters on the evolving springback of spring strips of the grade 1.4310 with tensile strengths TS = 1500-1800 MPa.
One effect of high influence on the dimensional accuracy during bending is springback. It inevitably occurs due to the elastic proportion in the material behavior. The impact is notably high when producing springs made of ultra-high strength spring strips of the steel grade 1.4310 (X10CrNi18-8). The high yield ratio needed to fulfil the functionalities required during application leads to dimensional inaccuracies that have to be compensated during the production process. This paper reports a simulation-based approach to predict the springback behaviour of ultra-high strength spring strips with tensile strengths TS = 1500-1800 MPa. Based on the results of advanced material testing and modelling, the numerical prediction of the springback behavior of an exemplary bending process (free bending) has been investigated in detail. This helps to obtain deeper knowledge and understanding of the springback phenomenon and to achieve suitable strategies for a more efficient industrial tool and process design while processing ultra-high strength spring strips.
This paper includes a causal-based modelling of software meas-urement processes in order to clarify the real situations in the em-pirical software engineering field. A first overview about existing causal network approaches shows the problems and possible bene-fits using these formal techniques in the software engineering area. The definition and extension of the causal modelling using causal networks helps to understand the relationships between the differ-ent software process artefacts and their causalities. The causal net-work based process model (CNPM) concept is based on the causal network idea of Pearl. The description of first applications of the CNPM approach for CMMI demonstrates the empirical reasoning of the software improvement processes in an explicit manner.
Konventionelle Blechumformtechnologien sind bei geringen Stückzahlen häufig unwirtschaftlich. Roboterbasiertes Rollformen ist ein inkrementelles Verfahren zur flexiblen Fertigung von Profilbauteilen ab Losgröße 1. Die Umformung erfolgt mit einem Rollenkopf, der durch einen Roboterarm zugestellt und über das Werkstück bewegt wird. Durch die kinematische Gestalterzeugung können Werkzeugkosten gesenkt und kleine bis mittlere Stückzahlen wirtschaftlich gefertigt werden.
Conventional sheet metal forming technologies are often uneconomical for low production volumes. Robotic roll forming is an incremental process for the flexible production of profile components. The forming is performed with a roller head, which is actuated by a robot arm. Due to the kinematic process characteristics, tooling costs can be reduced and small-to-medium quantities can be produced economically.
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